International Journal of Engineering Science Invention Research & Development; Vol. III, Issue III, September 2016 www.ijesird.com, e-ISSN: 2349-6185

CONDITION MONITORING OF POWER - BIBLIOGRAPHY SURVEY 2 Jashandeep Singh Bahra Group of Institutions, Patiala Campus, Punjab, India

Key Words: Dielectric response, (DGA), Condition monitoring, Oil Insulation, Paper Insulation, Bubble effect, Drying process, Mechanical strength, Copper sulphur, Partial discharge (PD), Moisture.

Key Phrase: There is a universal requirement for up-to-date bibliographic information on insulation system of power transformer in the academic, research and engineering communities.

I. INTRODUCTION

Power are one of the most expensive elements in a power system and their failure due to any reason is a very bad event also to maintain & rectify the problems related to insulation failure become more expensive. Power transformers are mainly involved in the energy transmission and distribution. Unplanned power transformer outages have a considerable economics impact on the operation of electric power network. To have reliable operation of transformers, it is necessary to identify problems at an early stage before a catastrophic failure occurs. In spite of corrective and predictive maintenance, preventive maintenance of power transformer is gaining due importance in the modern era and it must be taken into account to obtain the highest reliability of power apparatus such as power transformers. The well known preventive maintenance techniques such as DGA, conditioning monitoring, partial discharge measurement, effect of moisture, Paper insulation, Oil insulation, mechanical strength, thermal conductivity, copper sulphur, bubble effect, drying process, thermal degradation, fault diagnosis, etc. are performed on transformer for a specific type of problem. There is a universal requirement for up-to-date bibliographic information on insulation system of power transformer in the academic, research and engineering communities. The same topic was earlier updated in 2008 and it is observed that many new areas have been identified by the researchers such as bubble effect, copper sulphur, mechanical strength, etc. This article lists relevant references grouped according to the topics described above. The research scholars can found all the research which have been carried out till date in this paper.

II. DISSOLVED GAS ANALYSIS (2014-2008)

[1] F. Wan, W. Chen et al., ―Using a sensitive optical system to analyze gases dissolved in samples extracted from ", IEEE Electr. Insul. Mag., vol. 30, no. 5, pp. 15-22, 2014. [2] U. Khayam, A. Susilo et al., ―Partial discharge characteristics and dissolved gas analysis of vegetable oil‖, in Conf. Record IEEE Int. Symp. Electr. Insul., vol. 2, pp. 330–333, 2014. [3] N. A. Bakar, S. Islam et al., ―A review of dissolved gas analysis measurement and interpretation techniques‖, IEEE Electr. Insul. Mag., vol. 30, no. 3, pp. 39-49, 2014. [4] T. Piotrowski, ―Probability distributions of gases dissolved in oil of failed power transformers‖, in Proc. Int. Conf. High Voltage Eng. Appl. (ICHVE), pp. 1-4, Sep 2014 . [5] AnXin Zhao, Xiaojun Tang et al., ―The on-site DGA detecting and analysis system based on the Fourier transform infrared instrument‖ in Proc. IEEE 12st Int. Conf. Instru. Measur. Technol., pp. 1036 – 1040, 2014. [6] Z. Sahri, R. Yusof et. al., ―FINNIM: Iterative Imputation of Missing Values in Dissolved Gas Analysis Dataset‖, IEEE Trans. Ind. Informat., vol. 10, no. 4, pp. 2093 – 2102, 2014. [7] Zhou Quan, Wang Shizheng et al., ―Power transformer fault diagnosis based on DGA combined with cloud model‖, in Proc. Int. Conf. High Voltage Eng. and Appl. (ICHVE), pp. 1-4, Sep 2014 . [8] M. Duval, L. Lamarre, ―The duval pentagon-a new complementary tool for the interpretation of dissolved gas analysis in transformers‖, IEEE Electr. Insul. Mag., vol. 30, no. 6, pp. 9 – 12, 2014. [9] Yi Cui, Hui Ma et al., ―Improvement of power transformer insulation diagnosis using oil characteristics data preprocessed by SMOTE Boost technique‖, IEEE Trans. Dielectr. Electr. Insul., vol. 21, no. 5, pp. 2363-2373, 2014. [10] J. B. Perez, ―Best Practices in Dissolved Gases Analysis (DGA) for Power Transformers‖, in Proc. IEEE Panama Conv. (CONCAPAN XXXIV) pp. 1 – 6, 2014. [11] Wei Chenghao, Wenhu Tang et al., ―Dissolved gas analysis method based on novel feature prioritization and support vector machine‖, IET J. Electric Power Appl., , vol. 8 , no. 8 , pp. 320 – 328, 2014. [12] N. A. Gómez, H. M. Wilhelm et al., ―Dissolved gas analysis (DGA) of natural ester insulating fluids with different chemical compositions‖, IEEE Trans. Dielectr. Electr. Insul., vol. 21, no. 3, pp. 1071-1078, 2014. [13] D. Malabanan, R. Nerves et al., ―Power transformer condition assessment using an immune neural network approach to Dissolved Gas Analysis‖, in Proc. IEEE Region 10 Conf. TENCON 2014, pp. 1-6, Oct. 2014. Jashandeep Singh ijesird, Vol. III, Issue III, September 2016/164

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[14] C. H. Yann, C. S. Huo, ―Dissolved gas analysis of mineral oil for power transformer fault diagnosis using fuzzy logic‖, IEEE Trans. Dielectr. Electr. Insul., vol. 20, no. 3, pp. 974-981, 2013. [15] M. SuganyaBharathi, M. W. Iruthayarajan et al., ―Interpretation of dissolved gas analysis in transformer oil using fuzzy logic system‖, in Proc. Power, Energy and Control Int. Conf. (ICPEC), pp. 245–249, 2013. [16] S. Souahlia, K. Bacha et. al., ―SVM-based decision for power transformers fault diagnosis using Rogers and doernenburg ratios DGA‖, in Proc.10th Systems, Signals & Devices Int. Conf. (SSD), pp. 1–6, 2013. [17] A. A. Suleiman, N. A. Muhamad et al., ―Introducing the Hybrid-DGA Interpretation software as an effective power transformer management tool‖, in Proc.4th Power Eng. Energy and Electr. Drives Int. Conf. (POWERENG), pp. 1410 – 1414, 2013. [18] F. D. Samirmi, T. Wenhu et al., ―Feature selection in power transformer fault diagnosis based on dissolved gas analysis‖, in Proc.4th IEEE/PES on Innovative Smart Grid Technologies Conf. (ISGT EUROPE), pp. 1-5, 2013. [19] K. Zou, W. Zhao et al., ―EDA-ANN based transformer fault recognition with dissolved gas‖, in Proc. IEEE/PES on Innovative Smart Grid Technologies Conf. (ISGT Asia), pp. 1 – 5, 2013. [20] A. K. Mehta, R. N. Sharma et al., ―Transformer diagnostics under dissolved gas analysis using Support Vector Machine‖, in Proc. Power, Energy and Control Int. Conf. (ICPEC), pp.181–186, 2013. [21] L. Huashu, M. Lin et al.,―A Monte-Carlo simulation method for industry transformer health prediction based on dissolved gas analysis‖, in Proc. Quality, Reliability, Risk, Maintenance, and Safety Engg. Int. Conf. (QR2MSE), pp.1673– 1676, 2013. [22] J. Haema, R. Phadungthin et al., ―A prediction technique of power transformer condition assessment via DGA parameters‖, in Proc. IEEE/PES Asia-Pacific on Power and Energy Eng.conf. (APPEEC), pp. 1–4, 2013. [23] Ming-Ta Yang, Li-Siang Hu et al., ―Intelligent fault types diagnostic system for dissolved gas analysis of oil-immersed power transformer‖, IEEE Trans. Dielectr. Electr. Insul., vol. 20, no. 6, 2013. [24] M. Donglai, Z. Wenjing et al.,“Establish Expert System of Transformer Fault Diagnosis Based on Dissolved Gas in Oil‖, in Proc. Information Science and Cloud Computing Companion Int. Conf. (ISCC-C), pp. 681 – 685, 2013. [25] Lian Chao, Ma Lin, ―Health assessment model of power transformer based on dissolved gas analysis by support vector machine‖, in Proc. 6th Information Management, Innovation Management and Industrial Engg. Int. Conf., vol. 1, pp. 280 – 283, 2013. [26] Z. Lizhi, C. Weigen et al., ―Laser Raman spectroscopy applied in detecting dissolved gas in transformer oil‖, in Annu. Rep. Conf. Electr. Insul. Dielectr. Phenomena (CEIDP), pp. 1145–1148, 2013. [27] M. R. Ahmed, M. A. Geliel, “Power transformer fault diagnosis using fuzzy logic technique based on dissolved gas analysis‖, in Proc. 21st IEEE Mediterranean Control & Automation Conf. (MED), pp. 584-589, 2013. [28] H. Molavi, A. Zahiri et al., ―Condition assessment and fault diagnosis of two load tap changers using dissolved gas analysis‖, in Proc. 22nd Int. Conf. Exhibition Electr. Distribution (CIRED), pp.1 –4, 2013. [29] J. Haema, R. Phadungthin; ―Power Transformer Condition Evaluation by the Analysis of DGA Methods‖, in Proc. IEEE/PES Asia- Pacific on Power and Energy Eng.conf. (APPEEC), pp. 1 – 4, 2012. [30] D. Zhou, N. Azis et al., ―Examining acceptable Dissolved Gas Analysis level of in-service transformers‖, in proc. Int. Conf. High Voltage Eng. Appl. (ICHVE), pp. 612 – 616, 2012. [31] N. A. Setiawan, Z. Adhiarga, et al., ―Power transformer incipient faults diagnosis using Dissolved Gas Analysis and Rough Set‖, in Proc. Int. Conf. Condition Monitoring and Diagnosis (CMD), pp. 950 – 953, 2012. [32] Xi Chen, Weigen Chen et al., ―Correlate-regression analysis of oil dissolved gas generation with cavity discharges‖, in Proc. High Voltage Engg. Appl. Int. Conf. (ICHVE), pp. 380 – 383, 2012. [33] S. Seifeddine, B. Khmais et al., ―Power transformer fault diagnosis based on dissolved gas analysis by artificial neural network‖, in Proc. Int. Conf. Renew. Ener. Veh. Technol. (REVET), pp. 230-236, 2012. [34] S. N Hettiwatte, H. A Fonseka, ―Analysis and interpretation of dissolved gases in transformer oil: A case study‖, in Proc. Int. Conf. Condition Monitoring and Diagnosis (CMD), pp. 35-38, 2012. [35] X. Wang, Z. D. Wang et al., “Comparison of online and lab DGA methods for condition assessment of mineral and vegetable transformer oils‖, in Proc. Int. Conf. Condition Monitoring and Diagnosis (CMD), pp. 617 – 620, 2012. [36] A. Siada, S. Islam, “A new approach to identify power transformer criticality and asset management decision based on dissolved gas- in-oil analysis‖, IEEE Trans. Dielectr. Electr. Insu., vol. 19, no. 3, pp. 1007 - 1012, 2012. [37] M. A. B. Amora, O. M. Almeida et. al., “Improved DGA method based on rules extracted from high-dimension input space”, IEEE Electr. Lett., vol. 48, no. 17, pp. 1048 – 1049, 2012. [38] M. A. G Martins, A. R. Gomes, “Comparative study of the thermal degradation of synthetic and natural esters and mineral oil: effect of oil type in the thermal degradation of insulating kraft paper‖, IEEE Electr. Insu. Mag., vol. 28, no. 2, pp. 22 – 28, 2012. [39] A. A. Suleiman, N.A Mohamad et al., ―Improving accuracy of DGA interpretation of oil-filled power transformers needed for effective condition monitoring‖, in Proc. Int. Conf. Condition Monitoring and Diagnosis (CMD), pp. 374 – 378, 2012. [40] Y. M. Kim, S. J. Lee et al., ―Development of dissolved gas analysis(DGA) expert system using new diagnostic algorithm for oil- immersed transformers‖, in Proc. Int. Conf. Condition Monitoring and Diagnosis (CMD), pp. 365 – 369, 2012. [41] Mansour, ―A new graphical technique for the interpretation of dissolved gas analysis in power transformers‖, in Annu. Rep. Conf. Electr. Insul. Dielectr. Phenomena (CEIDP), pp. 195 – 198, 2012. [42] Y. Zhao, W. Guangning et al., ―Application of a new sensor circuit model in the oil dissolved gas monitoring‖, in Proc. 10th IEEE Conf. chang. Proper. Appl. Dielectr. Mater. (ICPADM), pp. 1 – 4, 2012. [43] C. Perrier, M. Marugan, ―DGA comparison between ester and mineral oils‖, IEEE Trans. Dielectr. Electr. Insu., vol. 19, no. 5, pp. 1609- 1614, 2012. [44] U. Khayam, A. Rajab et al., ―Dielectric properties, partial discharge properties, and dissolved gas analysis of ricinnus oils as biodegradable liquid insulating materials‖, in Proc. Int. Conf. Condition Monitoring and Diagnosis (CMD), pp. 1249 – 1252, 2012. Jashandeep Singh ijesird, Vol. III, Issue III, September 2016/165

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[45] P. Mirowski, Y. LeCun; ―Statistical Machine Learning and Dissolved Gas Analysis: A Review‖, IEEE Trans. Power Del., vol. 27 , no. 4 pp. 1791 – 1799, 2012. [46] Q. Zhu, Y. Yin, et al., ―Study on the Online Dissolved Gas Analysis Monitor based on the Photoacoustic Spectroscopy‖, in Proc. Int. Conf. Condition Monitoring and Diagnosis (CMD), pp. 433 – 436, 2012. [47] S. S. Patil, S. E. Chaudhari; ―An Attempt to Investigate the Transformer Failure by using DGA and SFRA Analysis‖, in Proc. 10th IEEE Conf. chang. Proper. Appl. Dielectr. Mater. (ICPADM), pp. 1 – 4, 2012.Pp. 1 – 4, 2012. [48] Hu Jing-tao; Zhou Li-xing et al., ―Transformer Fault Diagnosis Method of Gas chromatographic Analysis Using Computer Image Analysis‖, in Proc. 2nd Intelligent System Design and Eng. Appl. Int.Conf (ISDEA), pp. 1169 – 1172, 2012. [49] H. Moulai, A. Nacer et al., ―Dissolved gases analysis in relation to the energy of electrical discharges in mineral oil‖, IEEE Trans. Dielectr. Electr. Insu., vol. 19, no. 2, pp. 498 – 504, 2012. [50] K. P. Oehlmann, L. Mao; ―Evaluation of distribution network transformer dissolvedgas analysis (DGA) data‖, Presented at IEEE/PES Transmission Distribution Conf. Exposition, pp. 1 – 4, 2012 [51] H. Huimin, Xu. Xiaotian; ―Study on transformer oil dissolved gas online monitoring and fault diagnosis method‖, in Proc. Int. Conf. Condition Monitoring and Diagnosis (CMD), pp. 593 – 596, 2012. [52] D. Skelly; ―Photo-acoustic spectroscopy for dissolved gas analysis: Benefits and Experience‖, in Proc. Int. Conf.ConditionMonitoring and Diagnosis (CMD), pp. 29 – 43, 2012. [53] M. Rajabimendi, E. P. Dadios; ―A hybrid algorithm based on neural-fuzzy system for interpretation of dissolved gas analysis in power transformers‖, in Proc. IEEE Region 10 Conf. TENCON 2012, pp. 1 – 6, 2012. [54] Fu Wan, W. Chen et al., ―Study on the gas pressure characteristics of photoacoustic spectroscopy detection for dissolved gases in transformer oil‖, in Proc. Int. Conf. High Voltage Eng. and Appl. (ICHVE), pp. 286 – 289, 2012. [55] F. R. Barbosa, O. M. Almeida et. al., ―Application of an artificial neural network in the use of physicochemical properties as a low cost proxy of power transformers DGA data‖, IEEE Trans. Dielectr. Electr. Insul., vol. 19, no. 1, pp. 239 – 246, 2012. [56] K. I. Annapoorani, D. B. Umamaheswari; ―Fault prediction based on dissolved gas concentration from insulating oil in power transformer using Neural Network‖, in Proc. 10th IEEE Conf. chang. Proper. Appl. Dielectr. Mater. (ICPADM), pp. 1 – 4, 2012. [57] C. H. Liu, T. L. Chen et al., "Using data mining to dissolved gas analysis for power transformer fault diagnosis”, in Proc. Int. Conf. Machine Learning and Cybernetics (ICMLC), vol. 5, pp. 1952 – 1957, 2012. [58] F. Zakaria, I. Musirin et al., “Artificial neural network (ANN) application in dissolved gas analysis (DGA) methods for the detection of incipient faults in oil-filled power transformer", in Proc. Int. Conf. Control System, Computing Eng. (ICCSCE), pp. 328 – 332, 2012. [59] R. B. Jadav, T. K. Saha et al., ―Transformer diagnostics using dissolved gas analysis and polarization and depolarization current measurements — A case study‖, in 21st Australasian Uni. Power Engg. Conf. (AUPEC), pp. 1-6, 2011. [60] A. D. Ashkezari, T. K. Saha et al., ―Evaluating the accuracy of different DGA techniques for improving the transformer oil quality interpretation”, in 21st Australasian Uni. Power Engg. Conf. (AUPEC), pp. 1-6, 2011. [61] S. Singh, M. N. Bandyopadhyay, ―Dissolved gas analysis technique for incipient fault diagnosis in power transformers: A bibliographic survey‖, IEEE Electr. Insul. Mag., vol. 26, no. 6, pp. 41- 46, 2010. [62] I. H. Atanasova, R. Frotscher; ―Carbon oxides in the interpretation of dissolved gas analysis in transformers and tap changers‖, IEEE Electr. Insul. Mag., vol. 26, no. 6, pp. 22-26, 2010 [63] A. Akbari, A. Setayeshmehr et al., ―Intelligent agent-based system using dissolved gas analysis to detect incipient faults in power transformers‖ IEEE Electr. Insul. Mag., vol. 26, no. 6, pp. 27- 40, 2010. [64] C. Weigen, P. Chong et al., ―Wavelet Networks in Power Transformers Diagnosis Using Dissolved Gas Analysis‖ IEEE Trans. Power Del., vol. 24, no. 1, pp. 187 - 194, 2009. [65] A. Shintemirov, W. Tang et al., ―Power Transformer Fault Classification Based on Dissolved Gas Analysis by Implementing Bootstrap and Genetic Programming‖, IEEE Trans. Syst., Man, Cybern. C, Appl. Rev., vol. 39, no. 1, pp. 69 – 79, 2009. [66] Z. Yang, W. H. Tang, ―Association Rule Mining-Based Dissolved Gas Analysis for Fault Diagnosis of Power Transformers‖, IEEE Trans. Syst., Man, Cybern. C, Appl. Rev., vol. 39, no. 6, pp. 597 – 610, 2009. [67] Z. J. Richardson, J. Fitch, ―A Probabilistic Classifier for Transformer Dissolved Gas Analysis With a Particle Swarm Optimizer‖, IEEE Trans. Power Del., vol. 23, no. 2, pp. 751 – 759, 2008.

III. MOISTURE (2014-2007)

[1] A. A. Sulieman, N. A. Muhamad et al., ―Effect of moisture on breakdown voltage and structure of palm based insulation oils‖ IEEE Trans. Dielectr. Electr. Insul., vol. 21, no. 5, pp. 2119 – 2126, 2014. [2] S. Wolny, A. Adamowicz et al., ―Influence of Temperature and Moisture Level in Paper-Oil Insulation on the Parameters of the Cole-Cole Model‖ IEEE Trans. Power Del., vol. 29, no. 1, pp. 246 – 250, 2014. [3] A. Mikulecky, Z. Stih; ―Influence of temperature, moisture content and ageing on oil impregnated paper bushings insulations‖, IEEE Trans. Dielectr. Electr. Insul., vol. 20, pp. 1421 – 1423, 2014. [4] N. Lelekakis, J. Wijaya et al., ―The effect of acid accumulation in power-transformer oil on the aging rate of paper insulation‖ IEEE Electr. Insul. Mag., vol. 30, no. 3, pp. 19 – 26, 2014. [5] S. Yanchao, Z. Yuanxiang, ―A study on electric conduction of transformer oil‖ IEEE Trans. Dielectr. Electr. Insul., vol. 21, no. 3, pp. 1061 – 1069, 2014. [6] M. Mandlik, T. S. Ramu, ―Moisture aided degradation of oil impregnated paper insulation in power transformers‖, IEEE Trans. Dielectr. Electr. Insul., vol. 21, no. 1, pp. 186 – 193, 2014.

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[7] R. B. Jadav, C. Ekanayake et al., ―Understanding the impact of moisture and ageing of transformer insulation on frequency domain spectroscopy‖, IEEE Trans. Dielectr. Electr. Insul., vol. 21, no. 1, pp. 369 – 379, 2014. [8] A. Baral, S. Chakravorti, ―Prediction of moisture present in cellulosic part of power transformer insulation using transfer function of modified debye model‖ IEEE Trans. Dielectr. Electr. Insul., vol. 21, no. 3, pp. 1368 – 1375. [9] M. Bagheri, B. T. Phung et al., ―Influence of temperature and moisture content on frequency response analysis of transformer winding‖ IEEE Trans. Dielectr. Electr. Insul., vol. 21, no. 3, pp. 1393 – 1404, 2014. [10] P. Przybylek, ―The influence of temperature and aging of cellulose on water distribution in oil-paper insulation‖, IEEE Trans. Dielectr. Electr. Insul., vol. 20, no. 2, pp. 552-556, 2013. [11] J. Gielniak, A. Graczkowski et al., ―Moisture in cellulose insulation of power transformers – statistics‖, IEEE Trans. Dielectr. Electr. Insul., vol. 20, no. 3, pp. 982-987, 2013. [12] B. Garcia, G. Robles et al., ―Moisture sensor to characterize transformer solid insulations in transformers under non-equilibrium conditions‖, in Proc. IEEE Int. Conf. Solid Dielectr. (ICSD), pp. 1028-1031, 2013. [13] R. Villarroel, B. Garcia et al., ―Experimental study on moisture dynamics in transformers insulated with natural-esters‖, in Proc. IEEE Int. Conf. Solid Dielectr. (ICSD), pp. 545-548, 2013. [14] D. F. Garcia, B. Garcia et al., ―A new methodology for determining the moisture diffusion coefficient of transformer solid insulation‖, in Proc. IEEE Int. Conf. Solid Dielectr. (ICSD), pp. 1024-1027, 2013. [15] Jun Liu, Lijun Zhou et al., ―Dielectric frequency response of oil-paper composite insulation with transient moisture distribution‖, IEEE Trans. Dielectr. Electr. Insul., vol. 20, pp. 1380 – 1387, 2013. [16] S. Sarkar, T. Sharma et al., ―A new approach for determination of moisture in paper insulation of in-situ power transformers by combining polarization-depolarization current and return voltage measurement results,‖, IEEE Trans. Dielectr. Electr. Insul., vol. 20, pp. 2325 – 2334, 2013. [17] J. Gielniak et al., “Moisture in cellulose insulation of power transformers - statistics”, IEEE Trans. Dielectr. Electr. Insul., vol. 20, pp. 982 - 987, 2013. [18] L. Jun, Z. Lijun et al., ―Dielectric frequency response of oil-paper composite insulation with transient moisture distribution‖ IEEE Trans. Dielectr. Electr. Insul., vol. 20, no. 4, pp. 1380 – 1387, 2013. [19] A. Mikulecky, Z. Stih et al., ―Influence of temperature, moisture content and ageing on oil impregnated paper bushings insulation‖ IEEE Trans. Dielectr. Electr. Insul., vol. 20, no. 4, pp. 1421 – 1427, 2013. [20] D. F. Garcia, R. Villarroel et al., ―A review of moisture diffusion coefficients in transformer solid insulation - Part 2: Experimental validation of the coefficients‖ IEEE Electr. Insul. Mag., vol. 29, no. 2, pp. 40 – 49, 2013. [21] D. F. Garcia, B. Garcia et. al., ―A review of moisture diffusion coefficients in transformer solid insulation-part 1: coefficients for paper and pressboard‖ IEEE Electr. Insul. Mag., vol. 29, no. 1, pp. 46 - 54, 2013. [22] D. J. Smith, S. G. McMeekin et al., ―A dielectric frequency response model to evaluate the moisture content within an oil impregnated paper condenser ‖ IET J. Sci. Measur. Technol., vol. 7, no. 4, pp. 223 – 231, 2013. [23] T. Wan, H. Qian et al., "Influence of copper ions in transformer oil properties and adsorption treatment‖ IEEE Trans. Dielectr. Electr. Insul., vol. 20, no. 1, pp. 141 – 146, 2013. [24] N. S. Murad, N. A. Muhamad et al., "A study on palm oil-based oil moisture absorption level and voltage breakdown‖ in Annu. Rep. IEEE Conf. Elect. Insul. Dielectr. Phenomena, (CEIDP), pp. 925 – 928, 2013. [25] L. Yantao, W. Guangning et al., "Influence of moisture and oxygen on aging of oil-paper insulation‖ in Annu. Rep. IEEE Conf. Elect. Insul. Dielectr. Phenomena, (CEIDP), pp. 120 – 123, 2013. [26] H. Jian, G. Chen et al., ―Influence of moisture on space charge dynamics in multilayer oil-paper insulation‖ IEEE Trans. Dielectr. Electr. Insul., vol. 19, no. 4, pp. 1456 – 1464, 2012. [27] S. K. Ojha, P. Purkait et al., ―Understanding the effects of moisture equilibrium process on dielectric response measurements for transformer oil-paper insulation systems‖ in proc. Int. Conf. Power, Energy, Nerist (ICPEN), pp. 1 – 6, 2012. [28] H. Jian, R. Liao et al., "Space charge dynamics in oil-paper insulation under the combination influence of moisture and temperature‖ in proc. Int. Conf. High Voltage Eng. Appl. (ICHVE), pp. 294 – 297, 2012. [29] I. S. Chairul, S. A. Ghani et al., "Kraft paper insulation's life assessment and effects of oxygen and moisture to paper insulation's deterioration rate‖ in proc. IEEE Int. Conf. Power and Energy, pp. 728 – 731, 2012. [30] A. Betie, F. Meghnefi et al., ―On the impacts of ageing and moisture on dielectric response of oil impregnated paper insulation systems‖ in Annu. Rep. IEEE Conf. Elect. Insul. Dielectr. Phenomena, (CEIDP), pp. 219 – 222, 2012. [31] Li. Jian, Z. Zhaotao et. al., ―A new mathematical model of moisture equilibrium in mineral and vegetable oil-paper‖, IEEE Trans. Dielectr. Electr. Insul., vol. 19, no. 5, pp. 1615 – 1622, 2012. [32] L. Jian, Z. Zhaotao et al., ―Characteristics of moisture diffusion in vegetable oil-paper insulation‖ IEEE Trans. Dielectr. Electr. Insul., vol. 19, no. 5, pp. 1650 - 1656, 2012. [33] M. Koch, T. Prevost et. al., ―Analysis of dielectric response measurements for condition assessment of oil- paper transformer insulation‖ IEEE Trans. Dielectr. Electr. Insul., vol. 19, no. 6, pp. 1908 – 1915, 2012. [34] R. B. Jadav, T. K. Saha et al., ―Understanding moisture diffusion process in oil-impregnated pressboard insulation of transformer‖, in Proc. IEEE Power Energy Society, General Meeting, pp. 1-8, 2012. [35] D. F. Garcia, B. Garcia et al., ―Experimental determination of the diffusion coefficient of water in transformer solid insulation‖, IEEE Trans. Dielectr. Electr. Insul., vol. 19, no.2, pp.427-433, 2012. [36] R. B. Jadav, C. Ekanayake et al., ―Impact of moisture and ageing on the dielectric response of transformer insulation‖, in 22st Australasian Uni. Power Engg. Conf. (AUPEC), pp. 1-6, 2011. [37] Z. Zhaotao, Li. Jian et al., ―Moisture diffusion in vegetable oil-paper insulation‖, in Proc. IEEE Int. Conf. Dielectr. Liquids (ICDL), pp. 1-4, 2011.

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[38] L. Ruijin, H. Jian et al., ―A comparative study of physicochemical, dielectric and thermal properties of pressboard insulation impregnated with natural ester and mineral oil‖, IEEE Trans. Dielectr. Electr. Insul., vol. 18, no. 5, pp. 1626 – 1637, 2011. [39] A. A Reykherdt, V. Davydov; ―Case studies of factors influencing frequency response analysis measurements and power transformer diagnostics‖, IEEE Electr. Insul. Mag., vol. 27, no. 1, pp. 22 – 30, 2011. [40] C. Sumereder, M. Muhr et al., "Moisture determination and degradation of solid insulation system of power transformers‖, in Conf. Record IEEE Int. Symp. Elect. Insul., pp. 1 – 4, 2010. [41] P. Przybylek; ―The influence of cellulose insulation aging degree on its water sorption properties and bubble evolution‖, IEEE Trans. Dielectr. Electr. Insul., vol. 17, no. 3, pp. 906 – 912, 2010. [42] Koch, M. ; S. Tenbohlen et al., ―Diagnostic Application of Moisture Equilibrium for Power Transformers‖, IEEE Trans. Power Del., vol. 25, no. 4, pp. 2574 – 2581, 2010. [43] S. Tenbohlen, M. Koch et al., ―Aging Performance and Moisture Solubility of Vegetable Oils for Power Transformers‖, IEEE Trans. Power Del., vol. 25, no. 2, pp. 825 – 830, 2010. [44] T. K. Saha, P. Purkait et al., ―Understanding the impacts of moisture and thermal ageing on transformer's insulation by dielectric response and molecular weight measurements‖ IEEE Trans. Dielectr. Electr. Insul., vol. 15, no. 2, pp. 568 –582, 2008. [45] A. Setayeshmehr, I. Fofana et al., ―Dielectric spectroscopic measurements on transformer oil-paper insulation under controlled laboratory conditions‖ IEEE Trans. Dielectr. Electr. Insul., vol. 15, no. 4, pp. 1100 – 1111, 2008. [46] J. H. Yew, M. K. Pradhan et al., ―Effects of moisture and temperature on the frequency domain spectroscopy analysis of power transformer insulation‖ in Proc. IEEE Power and Energy Society General Meeting - Conversion and Delivery of Electrical Energy in the 21st Century, pp. 1 – 8, 2008. [47] R. Yadav, A. Venkatasami et al., ―Frequency response analysis as a technique for moisture diagnostics of power transformers‖ Presented at 2008 Int. Conf. Condition Monitoring and Diagnosis, Beijing, China, pp. 906 – 908. [48] J. Dai, Z. D. Wang, et al., "Moisture and Aging Effect on the Creep Discharge Characteristics at the Oil/Transformer-board Interface under Divergent Field‖ in Annu. Rep. IEEE Conf. Elect. Insul. Dielectr. Phenomena, (CEIDP), pp. 662 – 665, 2008. [49] C. F. Ten, M. A. R. M. Fernando et al., ―Dielectric properties measurements of transformer oil, paper and pressboard with the effect of moisture and ageing‖ in Annu. Rep. IEEE Conf. Elect. Insul. Dielectr. Phenomena, (CEIDP), pp. 727 – 730, 2007.

IV. DIELECTRIC RESPONSE (2014-2008)

[1] M. S. Jaya, T. Leibfried et al., ―Accelerating Dielectric Response Measurements on Power Transformers—Part II: A Regression Approach‖ IEEE Trans. Power Del., vol. 29, no. 5, pp. 2095 – 2100, 2014. [2] A. A. Abdelmalik, L. A. Dissado et al., ―Charge transport in thermally aged paper impregnated with natural ester oil‖ IEEE Trans. Dielectr. Electr. Insul., vol. 21, no. 5, pp. 2318 – 2328, 2014. [3] A. K. Pradhan, B. Chatterjee et al., ―Effect of temperature on frequency dependent dielectric parameters of oil-paper insulation under non-sinusoidal excitation‖ IEEE Trans. Dielectr. Electr. Insul., vol. 21, no. 5, pp. 653 – 661, 2014. [4] M. Bagheri, B. T. Phung et al., ―Influence of temperature and moisture content on frequency response analysis of transformer winding‖ IEEE Trans. Dielectr. Electr. Insul., vol. 21, no. 3, pp. 1393 – 1404, 2014. [5] D. Geissler, T. Leibfried et al., ―Accelerating Dielectric Response Measurements on Power Transformers Frequency-Domain Approach‖, IEEE Trans. Power Del., vol. 28, no. 3, pp. 1469 – 1473, 2013. [6] A. Baral, S. Chakravorti et al., ―Assessment of non-uniform aging of solid dielectric using system poles of a modified debye model for oil-paper insulation of transformers‖, IEEE Trans. Dielectr. Electr. Insul., vol. 20, no. 5, pp. 1922 – 1933, 2013. [7] D. M Robalino, P. Werelius et. al., ―Continuous monitoring of power transformer solid insulation dry-out process — Application of dielectric frequency response‖ in Proc. Conf. IEEE Electr. Insul. (EIC), pp. 230 – 234, 2013. [8] Y. Cui, C. Ekanayake et al., ―Finite element method modeled dielectric response for condition evaluation of transformer insulation‖ in Annu. Rep. IEEE Conf. Elect. Insul. Dielectr. Phenomena, (CEIDP), pp. 39 – 42, 2013. [9] M. A. Talib, N. A. Muhamad et al., ―Application of PDC analysis to identify effect of overheating on dielectric response and conductivity of mineral insulating oil of in-services transformers‖ in Annu. Rep. IEEE Conf. Elect. Insul. Dielectr. Phenomena, (CEIDP), pp. 583 – 586, 2013. [10] M. Jaya, D. Geissler et al., "Accelerating Dielectric Response Measurements on Power Transformers—Part I: A Frequency-Domain Approach‖ IEEE Trans. Power Del., vol. 28, no. 3, pp. 1469 – 1473, 2013. [11] Z. Tao, M. Feilin, et al., "Estimation of dielectric response equivalent circuit parameters of transformers using QPSO‖ in proc. Int. Conf. High Voltage Eng. Appl. (ICHVE), pp. 303 – 306, 2012. [12] M. Koch, T. Prevost; ―Analysis of dielectric response measurements for condition assessment of oil-paper transformer insulation‖ IEEE Trans. Dielectr. Electr. Insul., vol. 19, no. 6, pp. 1908 – 1915, 2012. [13] R. Nikjoo, N. Taylor et al., ―Dielectric response measurement of power transformer bushing by utilizing high voltage transients‖ in Annu. Rep. IEEE Conf. Elect. Insul. Dielectr. Phenomena, (CEIDP), pp. 503 – 506, 2012. [14] J. Hao, R. Liao et al., Influence of natural ester on frequency dielectric response of impregnated insulation pressboard‖ IET J. Sci. Measur. Technol., vol. 6, no. 6, pp. 403 – 411, 2012. [15] M. Hui, T. K. Saha et al., ―Interpretation of dielectric response measurements of transformer insulation under temperature variations and transient effects”, in proc. IEEE Power, Energy Society General Meeting, pp. 1-8, 2012. [16] B. Nemeth, G. Csepes et al., ―Applicability of the dielectric response methods of diagnostics of power transformers: Hungarian experiences‖ in Proc. Conf. IEEE Electr. Insul. (EIC), pp. 49 – 53, 2011. [17] D. Ashkezari, M. Hui et al., ―Investigation of non-linearity in dielectric response measurements for transformer insulation diagnosis‖, in Proc. IEEE/PES on Innovative Smart Grid Technologies Conf. (ISGT Asia), pp. 1-7, 2011.

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[18] A. D. Ashkezari, M. Hui et al. ―Investigation of non-linearity in dielectric response measurements for transformer insulation diagnosis‖ in Proc. IEEE/PES on Innovative Smart Grid Technologies Conf. (ISGT Asia), pp. 1 – 7, 2011. [19] R. B. Jadav, C. Ekanayake et al., ―Dielectric response of transformer insulation - comparison of time domain and frequency domain measurements‖, Presented at 2010 Proc. Conf. IPEC, Singapore, pp. 199-204. [20] I. Fofana, H. Hemmatjou et al., "On the frequency domain dielectric response of oil-paper insulation at low temperatures‖ IEEE Trans. Dielectr. Electr. Insul., vol. 17, no. 3, pp. 799 – 807, 2010. [21] A. Graczkowski, J. Gielniak; ―Influence of impregnating liquids on dielectric response of impregnated cellulose insulation‖, in proc. 10th IEEE Int. Conf. solid dielectr.(ICSD), pp. 1-4, 2010. [22] W. S. Qiang, G. J. Zhang et al., ―Investigation on dielectric response characteristics of thermally aged insulating pressboard in vacuum and oil-impregnated ambient IEEE Trans. Dielectr. Electr. Insul., vol. 17, no. 6, pp. 1853 – 1862, 2010. [23] S. Bhumiwat, S. Lowe et al., ―Performance of oil and paper in transformers based on IEC 61620 and dielectric response techniques‖ IEEE Insul. Mag., vol. 26, no. 3, pp. 16 – 23, 2010. [24] Y. Shuangsuo, D. Ming et al., ―Application of dielectric response for oil-immersed transformer‖ in Proc. Int. Conf. Proper. Appl. Dielectr. Mater., pp. 370 – 373, 2009. [25] H. Provencher, B. Noirhomme, "Effect of aging on the dielectric properties of insulation paper of power transformers‖ in Proc. Conf. IEEE Electr. Insul. (EIC), pp. 473 – 477, 2009. [26] V. Ramakichenan, R. K. Jain et al., ―Experiences of dielectric response measurement in frequency domain for diagnostics of transformer insulation system‖ Presented at 2008 Int. Conf. Condition Monitoring and Diagnosis, Beijing, China, pp. 914–918. [27] T. K. Saha, P. Purkait et al., ―Investigations of Temperature Effects on the Dielectric Response Measurements of Transformer Oil- Paper Insulation System‖ IEEE Trans. Power Del., vol. 23, no. 1, pp. 252 – 260, 2008.

V. FAULT DIAGNOSIS (2014-2008)

[1] D. Martin, N. Lelekakis et al., ―Investigations Into the Stray Gassing of Oils in the Fault Diagnosis of Transformers‖ IEEE Trans. Power Del., vol. 29, no. 5, pp. 2369 – 2374, 2014. [2] A. Ashrafian, B. Vahidi et al., ―Time-time-transform application to fault diagnosis of power transformers‖, IET J. Generation, Transmis. Distribu., vol. 8, no. 6, pp. 1156 – 1167, 2014. [3] A. Marques, C. D. J. Ribeiro et al., ―Power transformer disruptions- a case study‖ IEEE Electr. Insul. Mag., vol. 30, no. 2, pp.17 – 21, 2014. [4] W. Xuelei, L. Qingmin et al., ―New reliability assessment of the fault diagnosis methodologies for transformers and a diagnostic scheme based on fault info integration‖, IEEE Trans. Dielectr. Electr. Insul., vol. 20, no. 6, pp. 2292 – 2298, 2013. [5] A. J. Quispe, L. Cambraia et al., ―Bayesian Networks applied to Failure Diagnosis in Power Transformer‖, in Proc. IEEE Trans. Latin America, vol. 11, no. 4, pp. 1075 – 1082, 2013. [6] C. M. Hui, C. Ekanayake et al., ―Power transformer fault diagnosis under measurement originated uncertainties‖, IEEE Trans. Dielectr. Electr. Insul., vol. 19, no. 6, pp. 1982 - 1990, 2012. [7] R. A. Hooshmand, M. Parastegari et al., ―Adaptive neuro-fuzzy inference system approach for simultaneous diagnosis of the type and location of faults in power transformers‖, IEEE Electr. Insul. Mag., vol.28, no.5, pp. 32 – 42, 2012. [8] V. Miranda, A. R. G. Castro et al., ―Diagnosing Faults in Power Transformers With Auto associative Neural Networks and Mean Shift‖, IEEE Trans. Power Del., vol. 27, no. 3, pp. 1350 – 1357, 2012. [9] C. M. Hui, C. Ekanayake et al., ―Power transformer fault diagnosis under measurement originated uncertainties”, IEEE Trans. Dielectr. Electr. Insul., vol. 19, no. 6, pp. 1982-1990, 2012. [10] H. B. Zheng, R. J. Liao et al., ―Fault diagnosis of power transformers using multi-class least square support vector machines classifiers with particle swarm optimization‖, IET J. Electr. Power Appl., vol. 5, no. 9, pp. 691 - 696, 2011. [11] K. Meng, Y. D. Zhao et al., ―A Self-Adaptive RBF Neural Network Classifier for Transformer Fault Analysis‖. IEEE Trans. Power Syst., vol. 25, no. 3, pp. 1350 – 1360, 2010. [12] C. M. Hui, C. Ekanayake et al., ―Past experience and future developments toward the safeguarding of power transformers‖, in Proc. Int. Conf. Electr. Comp. Eng.(ICECE), pp. 279-282, 2010.

VI. CONDITION MONITORING (2014-2008)

[1] Y. Biçen, F. Aras et al., ―Lifetime estimation and monitoring of power transformer considering annual load factors‖ IEEE Trans. Dielectr. Electr. Insul., vol. 21, no. 3, pp. 1360 – 1367, 2014. [2] A. D. Ashkezari, M. Hui et al., ―Investigation of feature selection techniques for improving efficiency of power transformer condition assessment‖ IEEE Trans. Dielectr. Electr. Insul., vol. 21, no. 2, pp. 836 – 844, 2014. [3] A. G. Deakin, J. W. Spencer et al., ―Chromatic Optoacoustic Monitoring of Transformers and their on load Tap Changers‖ IEEE Trans. Power Del. vol. 29, no. 1, pp. 207 – 214, 2014. [4] C. M. Hui, T. K. Saha et al., ―Statistical learning techniques and their applications for condition assessment of power transformer‖, IEEE Trans. Dielectr. Electr. Insul., vol. 19, no. 2, pp. 481-489, 2012. [5] C. M. Hui, T. K. Saha et al., ―Predictive learning and information fusion for condition assessment of power transformer‖, in proc. IEEE Power, Energy Society General Meeting, pp. 1-8, 2011. [3] C. Ekanayake, T. K. Saha et al. ―Application of polarization based measurement techniques for diagnosis of field transformers‖, in proc. IEEE Power, Energy Society General Meeting, pp. 1-8, 2010.

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[4] A. E. B. Elanien, M. M. A. Salama et al., ―Calculation of a Health Index for Oil-Immersed Transformers Rated Under 69 kV Using Fuzzy Logic‖ IEEE Trans. Power Del., vol. 27, no. 4, 2012. [5] M. S. A. Hejazi, J. Ebrahimi et al., ―Application of Ultra Wideband Sensors for On-Line Monitoring of Transformer Winding Radial Deformations–A Feasibility Study‖ IEEE Sensors J., vol. 12, no. 6, pp. 1649 – 1659, 2012. [6] S. Borucki; ―Diagnosis of Technical Condition of Power Transformers Based on the Analysis of Vibroacoustic Signals Measured in Transient Operating Conditions‖ IEEE Trans. vol. 27, No. 2, Pp. 670 – 676, 2012. [7] M. Arshad, S. M. Islam et al., ―Significance of cellulose power transformer condition assessment‖ IEEE Trans. Dielectr. Electr. Insul., vol. 18, no. 5, pp. 1591 - 1598, 2012. [8] V. M. Catterson, S. D. J McArthur et al., ―Online Conditional Anomaly Detection in Multivariate Data for Transformer Monitoring‖ IEEE Trans. Power Del., vol. 25, no. 4, pp. 2556 – 2564, 2010. [9] Gaouda, A.M. ; Salama, M.M.A., "DSP Wavelet-Based Tool for Monitoring Transformer Inrush Currents and Internal Faults”, IEEE Transactions on Power Del., vol. 25 , no. 3, pp. 1258 – 1267, 2010. [10] E. Rivas, J. C. Burgos et al., ―Condition Assessment of Power OLTC by Vibration Analysis Using Wavelet Transform” IEEE Trans. Power Del., vol. 24, no. 2, pp. 687 – 694, 2009. [11] T. D. Rybel, A. Singh et al., ―Apparatus for Online Power Transformer Winding Monitoring Using Bushing Tap Injection‖ IEEE Trans. Power Del., vol. 24, no. 3, pp. 996 – 1003, 2009. [12] T. Babnik, R. K. Aggarwal et al., ―Principal Component and Hierarchical Cluster Analyses as Applied to Transformer Partial Discharge Data With Particular Reference to Transformer Condition Monitoring” IEEE Trans. Power Del., vol. 23, no. 4, pp. 2008 – 2016, 2008. [13] X. Zhang, E. Gockenbach; ―Asset-Management of Transformers Based on Condition Monitoring and Standard Diagnosis‖, IEEE Electr. Insul. Mag., vol. 24, no. 4, pp. 26 – 40, 2008.

VII. OIL & PAPER INSULATION (2014-2007)

[1] N. Azis, Q. Liu et al., ―Ageing assessment of transformer paper insulation through post mortem analysis‖ IEEE Trans. Dielectr. Electr. Insul., vol. 21, no. 2, pp. 845 – 853, 2014. [2] H. Shuai, L. Qingmin et al., ―Electrical and mechanical properties of the oil-paper insulation under stress of the hot spot temperature‖ IEEE Trans. Dielectr. Electr. Insul., vol. 21, no. 1, pp. 179 – 185, 2014. [3] V. Vasovic, J. Lukic et al., ―Equilibrium charts for moisture in paper and pressboard insulations in mineral and natural ester transformer oils‖ IEEE Electr. Insul. Mag. vol. 30, no. 2, pp. 10 – 16, 2014. [4] W. Sima, P. Sun et al. ―Study on the accumulative effect of repeated lightning impulses on insulation characteristics of transformer oil impregnated paper‖ IEEE Trans. Dielectr. Electr. Insul., vol. 21, no. 1, pp. 1933 – 1941, 2014. [5] H. M. Wilhelm, G. B Stocco et al., ―Reclaiming of in-service natural ester-based insulating fluids‖, IEEE Trans. Dielectr. Electr. Insul., vol. 20, no. 1, pp. 128-134, 2013. [6] H.M. Wilhelm, G. B Stocco et al., ―Edible natural ester oils as potential insulating fluids‖, IEEE Trans. Dielectr. Electr. Insul., vol. 20, no. 4, pp. 1395-1401, 2013. [7] R. Liao, C. Guo et al., ―Investigation on thermal aging characteristics of vegetable oil-paper insulation with flowing dry air‖ IEEE Trans.Dielectr. Electr. Insul., vol. 20, no. 5, pp. 1649 – 1658, 2013. [8] L. Jian, H. Zhiman et al., "Electrical aging lifetime model of oil-impregnated paper under pulsating DC voltage influenced by temperature‖ IEEE Trans. Dielectr. Electr. Insul., vol. 20, no. 6, pp. 1992 – 1997, 2013. [9] Y. M. Zheng, Z. Wang; "Study on broadband loss characteristics of oil-immersed papers for fast transient modeling of power transformer‖ IEEE Trans. Dielectr. Electr. Insul., vol. 20, no. 2, pp. 564 – 570, 2013. [10] J. Wada, G. Ueta et al., ―Influence of trace components contained in transformer insulating oil on various characteristics over time‖ IEEE Trans. Dielectr. Electr. Insul., vol. 20, no. 4, pp. 1388 – 1394, 2013. [11] T. Leibfried, M. Jaya et al., ―Postmortem Investigation of Power Transformers Profile of Degree of Polymerization and Correlation With Furan Concentration in the Oil‖ IEEE Trans. Power Del., vol. 28, no. 2, pp. 886 – 893, 2013. [12] A. Baral, S. Chakravorti; ―Assessment of non-uniform aging of solid dielectric using system poles of a modified debye model for oil-paper insulation of transformers‖ IEEE Trans. Dielectr. Electr. Insul., vol. 20, no. 5, pp. 1922 – 1933, 2013. [13] A. Mikulecky, Z. Stih et al., "Influence of temperature, moisture content and ageing on oil impregnated paper bushings insulation‖ IEEE Trans. Dielectr. Electr. Insul., vol. 20, no. 4, pp. 1421 – 1427, 2013. [14] B. S. H. M. S Matharage, M. A. R. M Fernando et al., ―Performance of coconut oil as an alternative transformer liquid insulation‖ IEEE Trans. Dielectr. Electr. Insul., vol. 20, no. 3, pp. 887 – 898, 2013. [15] P. Przybylek, ―The influence of temperature and aging of cellulose on water distribution in oil-paper insulation‖ IEEE Trans. Dielectr. Electr. Insul., vol. 20, no. 2, pp. 552 – 556, 2013. [16] S. Sarkar, T. Sharma et al., ―A new approach for determination of moisture in paper insulation of in-situ power transformers by combining polarization-depolarization current and return voltage measurement results‖ IEEE Trans. Dielectr. Electr. Insul., vol. 20, no. 6, pp. 2325 – 2334, 2013. [17] D. F. Garcia, B. Garcia et al., "A review of moisture diffusion coefficients in transformer solid insulation-part 1: coefficients for paper and pressboard‖ IEEE Electr. Insul. Mag., vol. 29, no. 1, pp. 46 - 54, 2013. [18] D. Martin, N. Lelekakis et al., ―Water uptake rates of transformer paper insulation impregnated with vegetable oil‖ IEEE Electr. Insul. Mag., vol. 29, no. 5, pp. 56 – 61, 2013. [19] H. Kawarai, Y. Uehara et al., "Influences of oxygen and 2, 6-di-tert-butyl-p-cresol on copper sulfide deposition on insulating paper in oil-immersed transformer insulation‖ IEEE Trans. Dielectr. Electr. Insul., vol. 19, no. 6, pp. 1884 – 1890, 2012.

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[20] R. Liao, H. Jian et al., "Quantitative analysis of ageing condition of oil-paper insulation by frequency domain spectroscopy‖ IEEE Trans. Dielectr. Electr. Insul., vol. 19, no. 3, pp. 821 – 830, 2012. [21] N. Lelekakis, D. Martin et al., "Ageing rate of paper insulation used in power transformers Part 1: Oil/paper system with low oxygen concentration‖ IEEE Trans. Dielectr. Electr. Insul., vol. 19, no. 6, pp. 1999 – 2008, 2012. [22] L. Jian, Z. Zhaotao et al., "Characteristics of moisture diffusion in vegetable oil-paper insulation‖ IEEE Trans. Dielectr. Electr. Insul., vol. 19, no. 5, pp. 1650 – 1656, 2012. [23] C. Krause; "Power transformer insulation – history, technology and design‖ IEEE Trans. Dielectr. Electr. Insul., vol. 19, no. 6, pp. 1941 – 1947, 2012. [24] H. Jian, G. Chen et al., ―Influence of moisture on space charge dynamics in multilayer oil-paper insulation‖ IEEE Trans. Dielectr. Electr. Insul., vol. 19, no. 4, pp. 1456 – 1464, 2012. [25] N. Lelekakis, D. Martin et al., "Ageing rate of paper insulation used in power transformers Part 2: Oil/paper system with medium and high oxygen concentration‖ IEEE Trans. Dielectr. Electr. Insul., vol. 19, no. 6, pp. 2009 – 2018, 2012. [26] R. Liao, S. Liang et al. "Comparison of ageing results for transformer oil-paper insulation subjected to thermal ageing in mineral oil and ageing in retardant oil‖, IEEE Trans. Dielectr. Electr. Insul., vol.19, no.1, pp. 225–232, 2012. [27] E. I. Koufakis, C. D. Halevidis et al., ―Calculation of the activation energy of oil-paper insulation in a ‖ IEEE Electr. Insul. Mag., vol. 28, no. 2, pp. 52 – 58, 2012. [28] J. R. Serrano, M. V. R. Moreno et al., ―Electro-acoustic detection, identification and location of partial discharge sources in oil- paper insulation systems‖ IEEE Trans. Dielectr. Electr. Insul., vol. 19, no. 5, pp. 1569 – 1578, 2012. [29] H. Jian, R. Liao et al., "Quantitative analysis ageing status of natural ester-paper insulation and mineral oil-paper insulation by polarization/depolarization current‖ IEEE Trans. Dielectr. Electr. Insul., vol. 19, no. 1, pp. 188 – 199, 2012. [30] M. Koch, T. Prevost; "Analysis of dielectric response measurements for condition assessment of oil-paper transformer insulation‖ IEEE Trans. Dielectr. Electr. Insul., vol. 19, no. 6, pp. 1908 - 1915 , 2012. [31] J. Li, Z. Zhang et al., ―Preparation of a vegetable oil-based nanofluid and investigation of its breakdown and dielectric properties‖, IEEE Electr. Insul. Mag., vol. 28, no. 5, pp. 43-50, 2012. [32] S. Arazoe, D. Saruhashi et al., ―Electrical Characteristics of Natural and Synthetic Insulating Fluids‖, IEEE Trans. Dielectr. Electr. Insul., vol. 18, no. 2, pp. 506-512, 2011. [33] J. Gielniak, A. Graczkowski et al., ―Does the degree of cellulose polymerization affect the dielectric response?‖, IEEE Trans. Dielectr. Electr. Insul., vol. 18, no. 5, pp. 1647-1650, 2011. [34] D. Saruhashi, S. Arazoe, et al., ―Thermal Degradation Characteristics of Insulating Paper and Oils‖, in Proc. IEEE Int. Conf. Dielectr. Liquids (ICDL), pp. 1 – 4, 2011. [35] H. M. Wilhelm, L. Tulio et al., ―Aging Markers for In-service Natural Ester-based Insulating Fluids‖, IEEE Trans. Dielectr. Electr. Insul., vol.18, pp.714-719, 2011. [36] M. Hui, T. K. Saha et al., ―Machine learning techniques for power transformer insulation diagnosis‖, in 21st Australasian Uni. Power Engg. Conf. (AUPEC), pp. 1-6, 2011. [37] R. Liao, H. Jian et al., ―Study on aging characteristics of mineral oil/natural ester mixtures-paper insulation‖, in Proc. IEEE Int. Conf. Dielectr. Liquids (ICDL), pp. 1-4, 2011. [38] Z. Zhaotao, L. Jian et al., ―Moisture equilibrium in vegetable oil and paper insulation system‖, in Annu. Rep. Conf. Elect. Insul. Dielectr. Phenomena (CEIDP), pp. 428-431, 2011. [39] W. J. Lin, G. J. Zhang et al.―Novel characteristic parameters for oil-paper insulation assessment from differential time-domain spectroscopy based on polarization and depolarization current measurement‖ IEEE Trans. Dielectr. Electr. Insul., vol. 1, no. 6, pp. 1918 – 1928, 2011. [40] M. Koch, S. Tenbohlen et al. "Evolution of bubbles in oil-paper insulation influenced by material quality and ageing‖ IET J. Elect. Power Appl., vol. 5, no. 1, pp. 168 – 174, 2011. [41] M. A. G. Martins, "Correction to "Vegetable oils, an alternative to mineral oil for power transformers-experimental study of paper aging in vegetable oil versus mineral oil" IEEE Electr. Insul. Mag., vol. 27, no. 1, pp. 46, 2011. [42] K. B. Liland, M. Kes et al., ―Study of oxidation and hydrolysis of oil impregnated paper insulation for transformers using a micro calorimeter‖ IEEE Trans. Dielectr. Electr. Insul., vol. 18, no. 6, pp. 2059 – 2068, 2011. [43] S. Toyama, K. Mizuno et al., "Influence of inhibitor and oil components on copper sulfide deposition on kraft paper in oil- immersed insulation‖ IEEE Trans. Dielectr. Electr. Insul., vol. 18, no. 6, pp. 1877 – 1885, 2011. [44] P. Rozga, "Influence of paper insulation on the pre-breakdown phenomena in mineral oil under lightning impulse‖ IEEE Trans. Dielectr. Electr. Insul., vol. 18, no. 3, pp. 720 – 727, 2011. [45] R. Liao, L. J Yang et al., "Aging condition assessment of transformer oil-paper insulation model based on partial discharge analysis‖ IEEE Trans. Dielectr. Electr. Insul., vol. 18, no. 1, pp. 303 – 311, 2011. [46] M. H. G. Ese, K. B. Liland et al., "Oxidation of paper insulation in transformers‖ IEEE Trans. Dielectr. Electr. Insul., vol. 17, no. 3, pp. 939 – 946, 2010. [47] O. Widlund, T. Laneryd, ―Numerical analysis of electric fields in composite oil/cellulose insulation‖ in Annu. Rep. Conf. Elect. Insul. Dielectr. Phenomena (CEIDP), pp. 1 – 4, 2010. [48] S. Arazoe, D. Saruhashi et al., ―Electrical Characteristics of Environmentally Friendly Insulating Oils‖, in Proc. IEEE Conf. Elect. Insul. Dielectr. Phenomena (CEIDP), pp. 1-4, 2010. [49] K.Yasuda, S.Arazoe et al., ―Comparison of the Insulation Characteristics of Natural and Environmentally – Friendly Oils‖, IEEE Trans. Dielectr. Electr. Insul., vol. 17, no. 3, pp. 791-798, 2010. [50] Z. Zhaotao, L. Jian et al., ―Electrical properties of nano-modified insulating vegetable oil‖, in Proc. IEEE Conf. Elect. Insul. Dielectr. Phenomena (CEIDP), pp. 1-4, 2010.

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[51] C. M. Hui, T. K. Saha et al., ―Power transformer insulation diagnosis under measurement originated uncertainties‖, in proc. IEEE Power, Energy Society General Meeting, pp. 1-8, 2010. [52] C. M. Hui, T. K. Saha et al., ―Intelligent framework and techniques for power transformer insulation diagnosis‖, in proc. IEEE Power, Energy Society General Meeting, pp. 1-7, 2009. [53] Y. Shirasaka, H. Murase et al., "Cross-sectional comparison of insulation degradation mechanisms and lifetime evaluation of power transmission equipment‖ IEEE Trans. Dielectr. Electr. Insul., vol. 16, no. 2, pp. 560 – 573, 2009. [54] T. Amimoto, E. Nagao et. al., "Identification of affecting factors of copper sulfide deposition on insulating paper in oil‖ IEEE Trans. Dielectr. Electr. Insul., vol. 16, no. 1, pp. 265 – 272, 2009. [55] T. Amimoto, E. Nagao et. al., ―Concentration dependence of corrosive sulfur on copper-sulfide deposition on insulating paper used for power transformer insulation‖ IEEE Trans. Dielectr. Electr. Insul., vol. 16, no. 5, pp. 1489 – 1495, 2009. [56] S. Okabe; "Evaluation of breakdown characteristics of oil-immersed transformers under non-standard lightning impulse waveforms - definition of non-standard lightning impulse waveforms and insulation characteristics for waveforms including pulses‖ IEEE Trans. Dielectr. Electr. Insul., vol. 14, no. 1, pp. 146 – 155, 2007. [57] R. Liao, C. Tang et al., ―Thermal Aging Studies on Cellulose Insulation Paper of Power Transformer Using AFM‖, in Proc. 8th Int. Conf. Proper. Appl. Dielectr. Material, pp. 722-725, 2006. [58] S. Caixin, L. Jian et al., ―Electric Properties of Vegetable Oil-Based Dielectric Liquid and Lifetime Estimation of the Oil-Paper Insulation‖, in Proc. IEEE Conf. Elect. Insul. Dielectr. Phenomena (CEIDP), pp. 680-683, 2006.

VIII. AGING STUDY AND LIFETIME ESTIMATION (2014-2007)

[1] Y. Biçen, F. Aras et al., ―Lifetime estimation and monitoring of power transformer considering annual load factors‖ IEEE Trans. Dielectr. Electr. Insul., vol. 21, no. 3, pp. 1360 – 1367, 2014. [2] A. Ciuriuc, P. Notingher et. al., "Lifetime estimation of vegetable oil for transformers‖, in proc. Int. Conf. High Voltage Eng. Appl. (ICHVE), pp. 1 – 4, 2014. [3] M. R. Meshkatoddini, ―Aging Study and Lifetime Estimation of Transformer Mineral Oil‖, American J. Eng. Applied Sci., vol. 1, no. 4, pp. 384-388, 2008.

IX. MECHANICAL STRENGTH (2014-2007)

[1] A. Bakshi, S. V. Kulkarni, ―Analysis of Buckling Strength of Inner Windings in Transformers Under Radial Short-Circuit Forces‖ IEEE Trans. Power Del., vol. 29, no. 1, pp. 241 – 245, 2014. [2] M. Bagheri, T. Phung et al., "Transformer frequency response analysis: mathematical and practical approach to interpret mid- frequency oscillations‖ IEEE Trans. Dielectr. Electr. Insul., pp. 1962 – 1970, 2013. [3] S. R. Cove, M. Ordonez et al., "Applying Response Surface Methodology to Small Planar Transformer Winding Design‖ IEEE Trans. Ind. Electron., Vol. 60 , No. 2, Pp. 483 – 493, 2013. [4] Y. Zheng, Z. Wang; ―Determining the Broadband Loss Characteristics of Power Transformer Based on Measured Transformer Network Functions and Vector Fitting Method‖ IEEE Trans. Power Del., vol. 28, no. 4, pp. 2456 – 2464, 2013. [5] D. A. K. Pham, T. M. T Pham et al., "A new method for purposes of failure diagnostics and FRA interpretation applicable to power transformers‖ IEEE Trans. Dielectr. Electr. Insul., vol. 20, no. 6, pp. 2026 – 2034, 2013. [6] M. Bagheri, M. S. Naderi et al., "Frequency response analysis and short-circuit impedance measurement in detection of winding deformation within power transformers‖ IEEE Electr. Insul. Mag., vol. 29, no. 3, pp. 33 – 40, 2013. [7] D. J Smith, S. G. McMeekin et al., ―A dielectric frequency response model to evaluate the moisture content within an oil impregnated paper condenser bushing‖ IET J. Sci., Measur. Technol., vol. 7, no. 4, pp. 223 – 231, 2013. [8] E. G. Luna, G. A. Mayor et al., "Current Status and Future Trends in Frequency-Response Analysis With a Transformer in Service‖ IEEE Trans. Power Del., vol. 28, no. 2, pp. 1024 – 1031, 2013. [9] S. Pramanik, L. Satish et al., ―Estimation of Series Capacitance for a Three-Phase Transformer Winding From Its Measured Frequency Response‖ IEEE Trans. Power Del., vol. 28, no. 4, pp. 2437 – 2444, 2013. [10] E. G. Luna, G. A. Mayor et al., ―Application of Wavelet Transform to Obtain the Frequency Response of a Transformer From Transient Signals—Part 1: Theoretical Analysis‖ IEEE Trans. Power Del., vol. 28, no. 3, pp. 1709 – 1714, 2013. [11] E. A. Murawwi, R. Mardiana et al., ―Effects of terminal connections on sweep frequency response analysis of transformers‖ IEEE Electr. Insul. Mag., vol. 28, no. 3, pp. 8 – 13, 2012. [12] K. Ludwikowski, K. Siodla et al., "Investigation of transformer model winding deformation using sweep frequency response analysis‖ IEEE Trans. Dielectr. Electr. Insul., vol. 19, no. 6, pp. 1957 – 1961, 2012. [13] A. A. Reykherdt, V. G. Davydov; "Effects of test cable ground extensions on repeatability of frequency response analysis measurements on power transformers‖ IEEE Electr. Insul. Mag., vol. 28, no. 3, pp. 26 – 31, 2012. [14] L. Xiaohu, L. Hui et al., ―A Start-Up Scheme for a Three-Stage Solid-State Transformer With Minimized Transformer Current Response‖ IEEE Trans. Power Electron. vol. 27, no. 12, pp. 4832 - 4836, 2012. [15] M. K. Pradhan, K. J. H. Yew; "Experimental investigation of insulation parameters affecting power transformer condition assessment using frequency domain spectroscopy‖ IEEE Trans. Dielectr. Electr. Insul., vol. 19, no. 6, pp. 1851 – 1859, 2012. [16] Y. Yang, Z. Wang; "Broadband frequency response analysis of transformer windings‖ IEEE Trans. Dielectr. Electr. Insul., vol. 19, no. 5, pp. 1782 – 1790, 2012.

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[17] J. Liu, L. Zhou et al., "Dielectric frequency response of oil-paper composite insulation modified by nanoparticles‖ IEEE Trans. Dielectr. Electr. Insul., vol. 19, no. 2, pp. 510 – 520, 2012. [18] M. Koch, T. Prevost; "Analysis of dielectric response measurements for condition assessment of oil-paper transformer insulation‖ IEEE Trans. Dielectr. Electr. Insul., vol. 19, no. 6, pp. 1908 – 1915, 2012. [19] M. F. M. Yousof, C. Ekanayak et al., ―A study on suitability of different transformer winding models for frequency response analysis”, in Proc. IEEE Power, Energy Soc. General Meeting, pp. 1-8, 2012. [20] J. Jadidian, M. Zahn et al., ―Surface flashover development on transformer oil-pressboard interface‖, in Proc. IEEE Int. Conf. Power Modulator and High Voltage (IPMHVC), pp. 39-42, 2012. [21] K. Ludwikowski, K. Siodla et al., ―Investigation of transformer model winding deformation using sweep frequency response analysis‖, IEEE Trans. Dielectr. Electr. Insul., vol. 19, no. 6, pp. 1957-1961, 2012. [22] C. A. Platero, F. Blázquez et al., "Influence of Rotor Position in FRA Response for Detection of Insulation Failures in Salient-Pole Synchronous Machines‖ IEEE Trans. Energy Convers., vol. 26, no. 2, pp. 671 – 676, 2011. [23] A. A. Reykherdt, V. Davydov et al., "Case studies of factors influencing frequency response analysis measurements and power transformer diagnostics‖ IEEE Electr. Insul. Mag., vol. 27, no. 1, pp. 22 – 30, 2011. [24] S. D. Mitchell, J. S. Welsh; ―Modeling Power Transformers to Support the Interpretation of Frequency-Response Analysis‖ IEEE Trans. Power Del., vol. 26, no. 4, pp. 2705 – 2717, 2011. [25] A. Shintemirov, W. H. Tang et al., "Transformer Core Parameter Identification Using Frequency Response Analysis‖ IEEE Trans. Magn., vol. 46, no. 1, pp. 141 – 149, 2010. [26] A. Shintemirov, W. H. Tang et al., "Transformer winding condition assessment using frequency response analysis and evidential reasoning‖ IET J. Electr. Power Appl., vol. 4, no. 3, pp. 198 – 212, 2010. [27] S. D. Mitchell, J. S. Welsh; "The Influence of Complex Permeability on the Broadband Frequency Response of a Power Transformer‖ IEEE Trans. Power Del., vol. 25, no. 2, pp. 803 – 813, 2010. [28] P. Przybylek, H. M. Grzesiak et al., ―The influence of water content and ageing degree of paper insulation on its mechanical strength‖, in Proc. 2010 IEEE Int. Conf. Solid Dielectr. (ICSD), pp. 1-3. [29] A. Shintemirov, W. H. Tang et al., "A Hybrid Winding Model of Disc-Type Power Transformers for Frequency Response Analysis‖ IEEE Trans. Power Del., vol. 24, no. 2, pp. 730 – 739, 2009. [30] W. Zhongdong, L. Jie et al., ―Interpretation of Transformer FRA Responses— Part I: Influence of Winding Structure‖ IEEE Trans. Power Del., vol. 24, no. 2, pp. 703 – 710, 2009. [31] N. Abeywickrama, Y. V. Serdyuk et al., "Effect of Core Magnetization on Frequency Response Analysis (FRA) of Power Transformers‖ IEEE Trans. Power Del., vol. 23, no. 3, pp. 1432 – 1438, 2008. [32] P. M. Nirgude, D. Ashokraju et al., ―Application of numerical evaluation techniques for interpreting frequency response measurements in power transformers‖ IET J. Sci., Measur. Technol., vol. 2, no. 5, pp. 275 – 285, 2008. [33] N. Abeywickrama, Y.V. Serdyuk et al., ―High-Frequency Modeling of Power Transformers for Use in Frequency Response Analysis (FRA)‖, IEEE Trans. Power Del., vol. 23, no. 4, pp. 2042-2049, 2008. [34] N. Abeywickrama, Y.V. Serdyuk et al., ―Effect of Core Magnetization on Frequency Response Analysis (FRA) of Power Transformers‖, IEEE Trans. Power Del., vol. 23, no. 3, pp. 1432-1438, 2008. [35] K. G. N. B. Abeywickrama, T. Daszczynski et al., ―Determination of Complex Permeability of Silicon Steel for Use in High- Frequency Modeling of Power Transformers‖, IEEE Trans. Magn., vol. 44, no.4, pp. 438-444, 2008. [36] A. D. Podoltsev, K. G. N. B. Abeywickrama et al., ―Multiscale Computations of Parameters of Power Transformer Windings at High Frequencies. Part I: Small-Scale Level‖, IEEE Trans. Magn., vol. 43, no.11, pp. 3991-3998, 2007. [37] A. D. Podoltsev, K. G. N. B. Abeywickrama et al., ―Multiscale Computations of Parameters of Power Transformer Windings at High Frequencies. Part II: Large-Scale Level‖, IEEE Trans. Magn., vol. 43, no.12, pp. 4076-4082, 2007. [38] A. D. Podoltsev, K. G. N. B. Abeywickrama et al., ―Computation of Parameters of Power Transformer Windings for Use in Frequency Response Analysis‖, IEEE Trans. Magn., vol. 43, no.5, pp. 1983-1990, 2007.

X. THERMAL CONDUCTIVITY (2014-2000)

[1] X. Yang, Q. Sen et al., ―Oxidation stability assessment of a vegetable transformer oil under thermal aging‖ IEEE Trans. Dielectr. Electr. Insul., vol. 21, no. 2, pp. 683 – 692, 2014. [2] G. Weimin, J. Miao et al., ―Finite Element Modeling of Heat Transfer in a Nanofluid Filled Transformer‖ IEEE Trans. Magnet. Vol. 50, no. 2, Article#: 7006104. [3] B. X. Du,X. L. Li et al., ―High thermal conductivity transformer oil filled with BN nanoparticles‖ in Proc. 18th IEEE Conf. Dielectr. Liquids (ICDL), pp. 1 – 4, 2014. [4] A. P. Bramantyo, S. Serra et al., ―Thermal ageing and corrosive sulphur effect on partial discharge and electrical conductivity of oil impregnated paper‖ in Proc. Int. Conf. Power Eng. Renewable Energy (ICPERE), pp. 163 – 166, 2014. [5] G. Dombek, Z. Nadolny et al., ―The study of thermal properties of mineral oil and synthetic ester modified by nanoparticles TiO2 and C60, in proc. Int. Conf. High Voltage Eng. Appl. (ICHVE), pp. 1 – 4, 2014. [6] M. A. Talib, N. A. Muhamad et al., "Application of PDC analysis to identify effect of overheating on dielectric response and conductivity of mineral insulating oil of in-services transformers‖ in Annu. Rep. Conf. Elect. Insul. Dielectr. Phenomena, (CEIDP), pp. 583 – 586, 2013. [7] S. C, Pugazhendhi, S.C, ―Experimental evaluation on dielectric and thermal characteristics of nano filler added transformer oil‖, in proc. Int. Conf. High Voltage Eng. Appl. (ICHVE), pp. 207 – 210, 2012.

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[8] R. Lopatkiewicz, Z. Nadolny et al., ―The influence of water content on thermal conductivity of paper used as transformer windings insulation‖, in Proc. Tenth Int. Conf. Proper. Appl. Dielectr. Materials,(ICPADM), pp. 1-4, 2012. [9] I. Fofana, H. Hemmatjou et al., "Effect of thermal transient on the polarization and depolarization current measurements‖ IEEE Trans. Dielectr. Electr. Insul., vol. 18, no. 2, pp. 513 – 520, 2011. [10] N. S. Jyothi, T. S. Ramu et al., ―Temperature distribution in resin impregnated paper insulation for transformer bushings‖ IEEE Trans. Dielectr. Electr. Insul., vol. 17, no. 3, pp. 931 – 938, 2010. [11] M. K. Pradhan, T. S. Ramu et al., "Estimation of the hottest spot temperature (HST) in power transformers considering thermal in homogeneity of the windings‖ IEEE Trans. Power Del., vol. 19, no. 4, pp. 1704 – 1712, 2004.

XI. ALTERNATIVE INSULATIONS (2014-2000)

[1] R. Villarroel, B. Garcia et al., ―Assessing the Use of Natural Esters for Transformer Field Drying‖ IEEE Trans. Power Del., vol. 29, no. 4, pp. 1894 – 1900, 2014. [2] H. Y. Lee, J. S. Jung et al., ―Numerical and Experimental Validation of Discharge Current With Generalized Energy Method and Integral Ohm's Law in Transformer Oil‖ IEEE Trans. Magn. vol. 50, no. 2, Article#: 7006204. [3] X. Yang, Q. Sen et al., ―Oxidation stability assessment of a vegetable transformer oil under thermal aging‖ IEEE Trans. Dielectr. Electr. Insul., vol. 21, no. 2, pp. 683 – 692, 2014. [4] B. S. H. M. S. Matharage, M. A. R. M. Fernando et al., ―Performance of coconut oil as an alternative transformer liquid insulation‖, IEEE Trans. Dielectr. Electr. Insul., vol. 20, no. 3, pp. 887-898, 2013. [5] W. M. L. B. Naranpanawe, M. A. R. M. Fernando et al., ―Performance analysis of natural esters as transformer liquid insulation — Coconut, castor and sesame oils‖ in Proc. IEEE Int. Conf. Ind. Inform. Syst. (ICIIS), pp. 105 – 109, 2013. [6] Y. Bertrand, P. Lauzevis et al., ―Low viscosity insulating liquid based on natural esters for distribution transformers‖ in 2013 IEEE Conf. Rec, Electr. Insul. (EIC), pp. 374 – 377, 2013. [7] T. Kano, T. Suzuki et al., ―Study on the oxidative stability of palm fatty acid ester (PFAE) as an insulating oil for transformers‖ in Conf. Rec. IEEE Int. Symp. Elect. Insul. pp. 22 – 25, 2012. [8] B. S. H. M. S. Matharage, M. A. R. M. Fernando et al., ―Coconut oil as transformer liquid insulation — Ageing and simulated thermal and electrical faults‖, in Annu. Rep. Conf. Elect. Insul. Dielectr. Phenomena, (CEIDP), pp. 839 – 842, 2012. [9] B. S. H. M. S. Matharage, M. A. A. P. Bandara et al., ―Aging effect of coconut oil as transformer liquid insulation — Comparison with mineral oil‖, in Proc. 7th IEEE Int. Conf. Ind. Inform. Syst. (ICIIS), pp. 1 – 6, 2012. [10] D. Hinduja, et al., ―Laboratory investigation of treated coconut oil as transformer liquid insulation‖, in Proc. 6th IEEE Int. Conf. Ind. Inform. Syst. (ICIIS), pp. 108 – 113, 2011. [11] R. Eberhardt, H. M. Muhr et al., ―Partial discharge behaviour of an alternative insulating liquid compared to mineral oil‖ in Conf. Record IEEE Int. Symp. Elect. Insul. (ISEI), pp. 1 – 4, 2010. [12] M. A. G. Martins; "Vegetable oils, an alternative to mineral oil for power transformers- experimental study of paper aging in vegetable oil versus mineral oil‖ IEEE Electr. Insul. Mag., vol. 26, no. 6, pp. 7 – 13, 2010. [13] L. Rongsheng, C. Tornkvist et al., ― Ester fluids as alternative for mineral oil: The difference in streamer velocity and LI breakdown voltage‖, in Annu. Rep. Conf. Elect. Insul. Dielectr. Phenomena, (CEIDP), pp. 543 – 548, 2009. [14] S. Ranawana, C. M. B. Ekanayaka et al., ―Analysis of Insulation Characteristics of Coconut Oil as an Alternative to the Liquid Insulation of Power Transformers‖, in Proc. 3rd IEEE Int. Conf. Ind. Inform. Syst. (ICIIS), pp. 1 – 5, 2008. [15] R. Eberhardt, H. M. Muhr et al., "Comparison of alternative insulating fluids‖, in Annu. Rep. Conf. Elect. Insul. Dielectr. Phenomena, (CEIDP), pp. 591 – 593, 2008. [16] E. Gockenbach, H. Borsi et al., "Natural and Synthetic Ester Liquids as alternative to mineral oil for power transformers‖ in Annu. Rep. Conf. Elect. Insul. Dielectr. Phenomena, (CEIDP), pp. 521 – 524, 2008. [17] C. F. Ten, M. A. R. M. Fernando et al., ―Dielectric properties measurements of transformer oil, paper and pressboard with the effect of moisture and ageing‖, in Annu. Rep. Conf. Elect. Insul. Dielectr. Phenomena, (CEIDP), pp. 727 – 730, 2007. [18] M. A. R. M. Fernando, H. Rajamantri et al., ―Performance of Silicone Rubber Composite Insulators in Sri Lanka‖, in Proc. 1st IEEE Int. Conf. Ind. Inform. Syst. (ICIIS), pp. 14 – 19, 2006. [19] M. Amanullah, S. M. Islam et al., "Analyses of physical characteristics of vegetable oils as an alternative source to mineral oil-based dielectric fluid‖ in Proc. IEEE Int. Conf. Dielectr. Liquids, ICDL, pp. 397 – 400, 2005. [20] H. Borsi, E. Gockenbach et al., "Properties of ester liquid model 7131 as an alternative liquid to mineral oil for transformers‖ in Proc. IEEE Int. Conf. Dielectr. Liquids, ICDL, pp. 377 – 380, 2005. [21] F. Sitinjak, I. Suhariadi et al., "Study on the characteristics of palm oil and it's derivatives as liquid insulating materials‖ in proc. Int. Conf. Proper. Appl. Dielectr. Mater., vol. 2, pp. 495 – 498, 2003.

XII. PARTIAL DISCHARGE (PD) (2014-2007)

[1] J. C. Chan, M. Hui et al., ―Automatic Blind Equalization and Thresholding for Partial Discharge Measurement in Power Transformer‖ ‖ IEEE Trans. Power Del., vol. 29, no. 4, pp. 1927 – 1938, 2014. [2] Y. H. feng, Y. Qian et al., ―Development of multi-band ultra-high-frequency sensor for partial discharge monitoring based on the meandering technique‖ IET J. Sci. Measure. Technol., vol. 8, no. 5, pp. 327 – 335, 2014. [3] M. Tsuchie, M. Kozako et al., ―Modeling of early stage partial discharge and overheating degradation of paper-oil insulation‖ IEEE Trans. Dielectr. Electr. Insul., vol. 21, no. 3, pp. 1342 – 1349, 2014.

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[4] R. Kiiza, M. Niasar et al., ―Change in partial discharge activity as related to degradation level in oil-impregnated paper insulation: effect of high voltage impulses‖ IEEE Trans. Dielectr. Electr. Insul., vol. 21, no. 3, pp. 1243 – 1250, 2014. [5] M. K. Chen, J. M. Chen et al., ―Partial discharge detection by RF coil in 161 kV power transformer‖ IEEE Trans. Dielectr. Electr. Insul., vol. 21, no. 3, pp. 1405 – 1414, 2014. [6] M. Homaei, S. M. Moosavian et al., ― Partial Discharge Localization in Power Transformers Using Neuro-Fuzzy Technique‖ IEEE Trans. Power Del., vol. 29, no. 5, pp. 2066 – 2076, 2014. [7] H. H. Sinaga, B. T. Phung et al., ―Recognition of single and multiple partial discharge sources in transformers based on ultra-high frequency signals‖ IET J. Gener. Transmiss. Distribu., vol. 8, no. 1, pp. 160 – 169, 2014. [8] Y. Sha, Y. Zhou et al., ―Partial discharge characteristics in oil-paper insulation under combined AC-DC voltage‖ IEEE Trans. Dielectr. Electr. Insul., vol. 21, no. 4, pp. 1529 – 1539, 2014. [9] M. Pompili, R. Bartnikas et al., ―Gas Formation in Transient Cavities Undergoing PD Pulse Burst Discharges in Transformer Oils‖ IEEE trans. Plasma Sci., vol. 42, no. 6, pp. 1697 – 1703, 2014. [10] G. Ueta, T. Tsuboi et al., ―Insulation characteristics of oil-immersed power transformer under lightning impulse and AC superimposed voltage‖ IEEE Trans. Dielectr. Electr. Insul., vol. 21, no. 3, pp. 1384 – 1392, 2014. [11] M. Hui, J. C. Chan et al., “Pattern recognition techniques and their applications for automatic classification of artificial partial discharge sources”, IEEE Trans. Dielectr. Electr. Insul., vol. 20, no. 2, pp. 468-478, 2013. [12] X. Qing, C. Shuyi et al., "Location of partial discharge in transformer oil using circular array of ultrasonic sensors‖ IEEE Trans. Dielectr. Electr. Insul., vol. 20, no. 5, pp. 1683 – 1690, 2013. [13] T. Umemura, S. Nakamura et al., "Partial discharges of small-air-gap in cast-resin insulation system‖ IEEE Trans. Dielectr. Electr Insul., vol. 20, no. 1, pp. 255 – 261, 2013. [14] F. P. Mohamed, W. H. Siew et al., "The use of power frequency current transformers as partial discharge sensors for underground cables‖, IEEE Trans. Dielectr. Electr. Insul., vol. 20, no. 3, pp. 814 – 824, 2013. [15] D. E. A. Mansour, H. Kojima et al., "Physical mechanisms of partial discharges at nitrogen filled delamination in epoxy cast resin power apparatus‖ IEEE Trans. Dielectr. Electr. Insul., vol. 20, no. 2, pp. 454 – 461, 2013. [16] L. Jisheng, X. Xiaohu et al. "Study of cross-shaped ultrasonic array sensor applied to partial discharge location in transformer oil‖ presented in Rev. Sci. Instrum. vol. 84, no. 11, pp. 115001-115005, 2013. [17] H. C. Chen; ―Partial discharge identification system for high voltage power transformers using fractal feature based extension method‖ IET J. Sci., Measure. Technol., vol. 7, no. 2, pp. 77 – 84, 2013. [18] G. Robles, R. Albarracin et al., "Shielding effect of power transformers tanks in the ultra-high-frequency detection of partial discharges‖ IEEE Trans. Dielectr. Electr. Insul., vol. 20, no. 2, pp. 678 – 684, 2013. [19] H. R. Mirzaei, A. Akbari et al., "A novel method for ultra-high-frequency partial discharge localization in power transformers using the particle swarm optimization algorithm‖ IEEE Electr. Insul. Mag., vol. 29, no. 2, pp. 26 – 39, 2013. [20] M. Shafiq, L. Kutt et al., "Parameters Identification and Modeling of High-Frequency Current Transducer for Partial Discharge Measurements‖, IEEE Sensors J., vol. 13, no. 3, pp. 1081 – 1091, 2013. [21] R. A. Hooshmand, M. Parastegari et al., "Simultaneous location of two partial discharge sources in power transformers based on acoustic emission using the modified binary partial swarm optimization algorithm‖ IET J. Sci., Measure. Technol., vol.7, no.2, pp.112 -118, 2013. [22] A. Kraetge, S. Hoek et al., "Robust measurement, monitoring and analysis of partial discharges in transformers and other HV apparatus‖ IEEE Trans. Dielectr. Electr. Insul., vol. 20, no. 6, pp. 2043 – 2051, 2013. [23] W. Sikorski, K. Siodla et al., ―Location of partial discharge sources in power transformers based on advanced auscultatory technique‖, IEEE Trans. Dielectr. Electr. Insul., vol. 19, no. 6, pp. 1948-1956, 2012. [24] J. C. Chan, Ma. Hui et al., ―A novel level-based automatic wavelet selection scheme for Partial Discharge measurement‖, in 22nd Australasian Uni. Power Engg. Conf. (AUPEC), pp. 1-6, 2012. [25] K. Ibrahim, R. M Sharkawy et al., "Realization of partial discharge signals in transformer oils utilizing advanced computational techniques‖ IEEE Trans. Dielectr. Electr. Insul., vol. 19, no. 6, pp. 1971 – 1981, 2012. [26] M. Beltle, A. Muller et al., "Statistical analysis of online ultrahigh-frequency partial-discharge measurement of power transformers‖ IEEE Electr. Insul. Mag., vol. 28, no. 6, pp. 17 – 22, 2012. [27] A. Rodrigo, P. Llovera et al., ―Study of partial discharge charge evaluation and the associated uncertainty by means of high frequency current transformers‖ IEEE Trans. Dielectr. Electr. Insul., vol. 19, no. 2, pp. 434 – 442, 2012. [28] G. C. Stone, "A perspective on online partial discharge monitoring for assessment of the condition of rotating machine stator winding insulation‖ IEEE Electr. Insul. Mag., vol. 28, no. 5, pp. 8 – 13, 2012. [29] A. H. E. Hag, Y. A. Saker et al., ―Online Oil Condition Monitoring Using a Partial- Discharge Signal‖ IEEE Trans. Power Del., vol. 26, no. 2, pp. 1288 – 1289, 2011. [30] S. Okabe, G. Ueta et al., "Partial discharge signal propagation characteristics inside the winding of oil-immersed power transformer - using the three-winding transformer model in air‖ IEEE Trans. Dielectr. Electr. Insul., vol. 18, no. 6, pp. 2024 – 2031, 2011. [31] S. Okabe, G. Ueta et al., "Partial discharge-induced degradation characteristics of insulating structure constituting oil-immersed power transformers‖ IEEE Trans. Dielectr. Electr. Insul., vol. 17, no. 5, pp. 1649 – 1656, 2010. [32] A. M. Jafari, A. Akbari et al., "Investigating practical experiments of partial discharge localization in transformers using winding modeling‖ IEEE Trans. Dielectr. Electr. Insul., vol. 15, no. 4, pp. 1174 – 1182, 2008. [33] M. S. Naderi, M. Vakilian et al., "A hybrid transformer model for determination of partial discharge location in transformer winding‖ IEEE Trans. Dielectr. Electr. Insul., vol. 14, no. 2, pp. 436 – 443, 2007.

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XIII. THERMAL DEGRADATION (2014-2007)

[1] F. Dongyin, W. Zhongdong et al., ―Evaluation of Power Transformers' Effective Hot-Spot Factors by Thermal Modeling of Scrapped Units‖ IEEE Trans. Power Del., vol. 29, no. 5, pp. 2077 – 2085, 2014. [2] M. Tsuchie, M. Kozako et al., ―Modeling of early stage partial discharge and overheating degradation of paper-oil insulation‖ IEEE Trans. Dielectr. Electr. Insul., vol. 21, no. 3, pp. 1342 – 1349, 2014. [3] D. Saruhashi, B. Xiang et al., ―Thermal Degradation Phenomena of Flame Resistance Insulating Paper and Oils‖, IEEE Trans. Dielectr. Electr. Insul., vol. 20, no. 1, pp. 122 – 127, 2013. [4] S. Okabe, G. Ueta et al., "Investigation of aging degradation status of insulating elements in oil-immersed transformer and its diagnostic method based on field measurement data‖ IEEE Trans. Dielectr. Electr. Insul., vol. 20, no. 1, pp. 346 – 355, 2013. [5] R. Liao, G. Chao et al. ―Investigation on thermal aging characteristics of vegetable oil-paper insulation with flowing dry air‖ IEEE Trans. Dielectr. Electr. Insul., vol. 20, no. 5, pp. 1649 – 1658, 2013. [6] L. M. Dumitran, A. Ciuriuc et al., "Thermal ageing effects on the dielectric properties and moisture content of vegetable and mineral oil used in power transformers‖ in conf. Record Int. Symp. Advanc. Topics Electr. Eng. (ATEE), pp. 1 – 6, 2013. [7] W. Baimei, L. Jian et al., ―Influence of proportion of vegetable insulating oil and mineral insulating oil on thermal aging of oil- paper insulation‖ in Annu. Rep. Conf. Elect. Insul. Dielectr. Phenomena, (CEIDP), pp. 180 – 183, 2013. [8] Y. Lijun, L. Ruijin, "Influence of vegetable oil on the thermal aging of transformer paper and its mechanism‖ IEEE Trans. Dielectr. Electr. Insul., vol. 18, no. 3, pp. 692 – 700, 2011. [9] J. Taosha, S. Grzybowski et al., ―Requirements and calculating methods for maximum insulated conductor temperatures in oil- immersed transformers‖, in proc. Int. Conf. High Voltage Eng. Appl. (ICHVE), pp. 653-656, 2010. [10] R. Liao, L. Yang et al., "Research on the dielectric properties and breakdown voltage of transformer oil-paper insulation after accelerating thermal ageing‖, in proc. Int. Conf. High Voltage Eng. Appl. (ICHVE), pp. 389 – 392, 2010. [11] R. Liao, L. Yang et al., "Influence of vegetable oil on the thermal aging rate of kraft paper and its mechanism‖, in proc. Int. Conf. High Voltage Eng. Appl. (ICHVE), pp. 381 – 384, 2010. [12] R. Liao, L. Yang et al., ―Hot spot temperature models based on top-oil temperature for oil immersed transformers‖, in Annu. Rep. Conf. Elect. Insul. Dielectr. Phenomena, (CEIDP), pp. 55 – 58, 2009. [13] M. Yoshida, Y. Konishi et al., ―Diagnosis for aging degradation of insulating paper in power transformers by measuring the refractive index of cellulose fibers‖ in Proc. Conf. IEEE Bucharest Power Technol., pp. 1 – 5, 2009. [14] R. Liao, L. Yang et al., ―Study on the Influence of Natural Ester on Thermal Ageing Characteristics of Oil-paper in Power Transformer‖ in proc. Int. Conf. High Voltage Eng. Appl. (ICHVE), pp. 437 – 440, 2008. [15] D. M. R. Vanegas, S. M. Mahajan et al., "Effects of Thermal Accelerated Ageing on a Medium Voltage Oil-Immersed ‖ in Conf. Record IEEE Int. Symp. Elect. Insul., pp. 470 – 473, 2008. [16] N. Yamagata, K. Miyagi et al., ―Diagnosis of Thermal Degradation for Thermally Upgraded Paper in Mineral Oil‖, Presented at 2008 Int. Conf. Condition Monitoring and Diagnosis, Beijing, China. [17] J. Liao, T. Chao et al., ―Thermal aging micro-scale analysis of power transformer pressboard‖, IEEE Trans. Dielectr. Electr. Insul., vol. 15, no. 5, pp. 1281-1287, 2008. [18] M. Mirzaie, A. Gholami et al., ―Thermal Degradation of Cellulose Paper Insulation in Power Transformers‖ in Proc. IEEE Int. Conf. Solid Dielectr., ICSD, pp. 673 – 676, 2007. [19] K. M. Takami, H. Gholnejad et al., "Thermal and hot spot evaluations on oil immersed power Transformers by FEMLAB and MATLAB software's‖ in Proc. Int. Conf. Thermal, Mech. Multi-Physics Simu. Exp. Micro- Electron. Micro-Syst., pp. 1 – 6, 2007.

XIV. COPPER-SULPHUR (2014-2000)

[1] R. Sarathi, I. P. M. Sheema et al., ―Understanding surface discharge activity in copper sulphide diffused oil impregnated pressboard under AC voltages‖ IEEE Trans. Dielectr. Electr. Insul., vol. 21, no. 2, pp. 674 – 682, 2014. [2] N. Mehanna, A. Jaber et al., “Assessment of dibenzyl disulfide and other oxidation inhibitors in transformer mineral oils‖ IEEE Trans. Dielectr. Electr. Insul., vol. 21, no. 3, pp. 1095 – 1099, 2014. [3] K. Mizuno, R. Nishiura et al., ―Elucidation of formation mechanism of by-products of copper sulfide deposition on insulating paper in oil-immersed transformer‖ IEEE Trans. Dielectr. Electr. Insul., vol. 21, no. 3, pp. 1376 – 1383, 2014. [4] R. M. De Carlo et al., ―Copper contaminated insulating mineral oils-testing and investigations‖, IEEE Trans. Dielectr. Electr. Insul., vol. 20, no. 2, pp. 557-563, 2013. [5] F. Scatiggio, M. Pompili et al., ―Health Index: The TRENA’s practical approach for transformer fleet management‖, in Proc. Conf. IEEE Electr. Insul. (EIC), pp. 178-182, 2013. [6] M. Kai, L. Zhen et al., ―Influence of semi conductive nano particle on sulfur corrosion behaviors in oil-paper insulation‖ in Annu. Rep. IEEE Conf. Elect. Insul. Dielectr. Phenomena, (CEIDP), pp. 715–718, 2013. [7] D. Zongchao, W. Guangning et al., ―Impacts of copper products on characteristics of frequency domain dielectric spectroscopy of oil-paper insulation‖ in Annu. Rep. IEEE Conf. Elect. Insul. Dielectr. Phenomena, (CEIDP), pp. 60 – 64, 2013. [8] P. S. Amaro, A. F. Holt et al., ―Impact of corrosive sulfur in transformer insulation paper‖, in Proc. Conf. IEEE Electr. Insul. (EIC), pp. 459 – 463, 2013. [9] V. Tumiatti, C. Roggero et al., ―IEC 62697-2012: State of the art methods for quantification of DBDS and other corrosive sulfur compounds in unused and used insulating liquids‖, IEEE Trans. Dielectr. Electr. Insul., vol. 19, no. 5, pp. 1633-1641, 2012.

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[10] N. Rudranna, J. S. Rajan et al., ―Modeling of copper sulphide migration in paper oil insulation of transformers‖ IEEE Trans. Dielectr. Electr. Insul., vol. 19, no. 5, pp. 1642 – 1649, 2012. [11] H. Zonghua; ―Influence of metal deactivator concentration on copper sulfur corrosion in transformer oil‖, in proc. Int. Conf. High Voltage Eng. Appl. (ICHVE), pp. 435 – 438, 2012. [12] F. Scatiggio, M. Pompili et al., ―Effects of metal deactivator concentration upon the gassing characteristics of transformer oils”, IEEE Trans. Dielectr. Electr. Insul., vol. 18, no. 3, pp. 701-706, 2011. [13] R. Maina, V. Tumiatti et al., ―Transformers Surveillance Following Corrosive Sulfur Remedial Procedures‖, IEEE Trans. Power Del., vol. 26, no. 4, pp. 2391-2397, 2011. [14] R. Maina, V. Tumiatti et al., "Copper dissolution and deposition tendency of insulating mineral oils related to dielectric properties of liquid and solid insulation‖, in Proc. IEEE Int. Conf. Dielectr. Liquids (ICDL), pp. 1-6, 2011. [15] R. Maina, V. Tumiatti et al., ― Dielectric Loss Characteristics of Copper-Contaminated Transformer Oils‖, IEEE Trans. Power Del., vol. 25, no. 3, pp. 1673-1677, 2010 [16] F. Scatiggio, R. Maina et al., ―Long term stability of insulating mineral oils following their corrosive sulfur removal‖, in Conf. Record IEEE Int. Symp. Elect. Insul., (ISEI), pp. 1- 4, 2010. [17] T. Amimoto, N. Hosokawa et al., "Concentration dependence of corrosive sulfur on copper-sulfide deposition on insulating paper used for power transformer insulation‖ IEEE Trans. Dielectr. Electr. Insul., vol. 16 , No. 5, pp. 1489 – 1495, 2009. [18] T. Amimoto, E. Nagao et al., ―Identification of affecting factors of Copper Sulfide deposition on Insulating paper in oil‖, IEEE Trans. Dielectr. Electr. Insul., vol. 6, no.1, pp. 265-272, 2009. [19] F. Scatiggio, V. Tumiatti et al., ―Corrosive Sulfur induced failures in oil filled Electrical Power Transformers and Shunt Reactors‖, IEEE Trans. Power Del., vol. 24, no. 3, pp. 1240-1248, 2009. [20] F. Scatiggio, M. Pompili et al., ―oils with presence of corrosive sulfur: Migration and collateral effects‖, in Proc. Conf. IEEE Electr. Insul. (EIC), pp. 478-481, 2009. [21] R. Maina, V. Tumiatti et al., ―Corrosive sulfur effects in transformer oils and remedial procedures‖, IEEE Trans. Dielectr. Electr. Insul., vol. 16, no. 6, pp. 1655-1663, 2009. [22] F. Scatiggio, V. Tumiatti et al., ―Corrosive Sulfur in insulating oils: Its detection and correlated power apparatus failures‖, IEEE Trans. Power Del., vol. 24, no. 1, pp. 508-509, 2008. [23] V. Tumiatti, R. Maina et al., ―In Service Reduction of Corrosive Sulfur Compounds in Insulating Mineral Oils‖ in Conf. Record IEEE Int. Symp. Elect. Insul., (ISEI), pp. 284- 286, 2008. [24] J. R. Sundara, C. J. Naidu et al., ―Influence of metal passivator on the corrosion of copper conductors due to sulphur in oil‖ in Conf. Record IEEE Int. Symp. Elect. Insul., (ISEI), pp. 487 – 490, 2008. [25] V. Tumiatti, R. Maina et al., ―Corrosive sulphur in mineral oils: Its detection and correlated transformer failures‖, in Conf. Record IEEE Int. Symp. Elect. Insul., (ISEI), pp. 400 – 402, 2006.

XV. BUBBLE EFFECT (2014-2000)

[1] Z. Zhong C. Lihua et al., "Evolution of bubble in oil-paper insulation and its influence on partial discharge‖ in Annu. Rep. IEEE Conf. Elect. Insul. Dielectr. Phenomena, (CEIDP), pp. 220 – 223, 2014. [1] P. Przybylek; ―A comparison of bubble evolution temperature in aramid and cellulose paper‖, in Proc. IEEE Int. Conf. Solid Dielectr. (ICSD), pp.983-986, 2013. [2] P. Przybylek, H. Moranda et al., ―Can the bubble effect occur in an oil impregnated paper bushing?‖, IEEE Trans. Dielectr. Electr. Insul., vol. 19, no. 6, pp.1879-1883, 2012. [3] M. Koch, S. Tenbohlen et al., ―Evolution of bubbles in oil-paper insulation influenced by material quality and ageing‖ IET J. Electr. Power Appl., vol. 5, no. 1, pp. 168 – 174, 2011. [4] P. Przybylek, ―The influence of cellulose insulation aging degree on its water sorption properties and bubble evolution‖, IEEE Trans. Dielectr. Electr. Insul., vol. 17, no. 3, pp. 906-912, 2010. [5] P. Przybylek, Z. Nadolny et al., ―Bubble effect as a consequence of dielectric losses in cellulose insulation‖, IEEE Trans. Dielectr. Electr. Insul., vol. 17, no. 3, pp. 913-919, 2010.

XVI. DRYING PROCESS (2014-2008)

[1] R. Villarroel, B. Garcia et al., ―Assessing the Use of Natural Esters for Transformer Field Drying‖ IEEE Trans. Power Del., vol. 29, no. 4, pp. 1894 – 1900, 2014. [2] R. Villarroel, B. Garcia et al., ―Diffusion coefficient in transformer pressboard insulation part 1: non impregnated pressboard‖ IEEE Trans. Dielectr. Electr. Insul., vol. 21, no. 1, pp. 360 – 368, 2014. [3] J. C. Burgos, J. L. Pirez et al., ―A tool to evaluate the economy of a transformer drying process‖, in Proc. IEEE Int. Conf. Solid Dielectr. (ICSD), pp. 1032-1035, 2013. [4] D. M. Robalino, P. Werelius et al., "Continuous monitoring of power transformer solid insulation dry-out process — Application of dielectric frequency response‖ in Proc. Conf. IEEE Electr. Insul. (EIC), pp. 230 – 234, 2013. [5] W. Ernst, H. Kau et al., "Dry-out properties of insulating paper in distribution transformers‖ in Annu. Rep. IEEE Conf. Elect. Insul. Dielectr. Phenomena, (CEIDP), pp. 223 – 225, 2012. [6] D. Diguero, M. Cano et al., "Effective and efficient evaluation of vacuum drying of power transformers in the field‖, Presented at IEEE/PES Transmission Distribution Conf. Exposition, pp. 1 – 4, 2012.

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[7] R. Villarroel, D. F. Garcia et al., ―Comparison of the drying times for kraft paper and pressboard in transformer factory drying‖, in Proc. 20th Int. Conf. Electr. Mach. (ICEM), pp. 1233-1237, 2012. [8] D. F. Garcia, B. Garcia et al., ―Transformer field drying improvement by applying low-frequency-heating‖, in Proc. 2012 Workshop Eng. Appl.(WEA), pp. 1-6. [9] D. F. Garcia, B. Garcia et al., ―Recommendations to improve the efficiency of drying processes in power transformer‖, in Proc. 20th Int. Conf. Electr. Mach. (ICEM), pp. 1-6, 2010.

XVII. OTHER IMPORTANT TOPICS ON POWER TRANSFORMER (2013-2005)

[1] D. Ashkezari, M. Hui et al., ―Application of fuzzy support vector machine for determining the health index of the insulation system of in-service power transformers‖, IEEE Trans. Dielectr. Electr. Insul., vol. 20, no. 3, pp. 965-973, 2013. [2] X. Zhang, J. K. Nowocin et al., ―Evaluating the reliability and sensitivity of the Kerr electro-optic field mapping measurements with high-voltage pulsed transformer oil‖, Appl. Physics Lett., vol. 103, no. 8, pp. 082903 - 082905, 2013. [3] X. Zhang, M. Zahn et al., ―Kerr electro-optic field mapping study of the effect of charge injection on the impulse breakdown strength of transformer oil‖, Appl. Physics Lett., vol. 103, no. 16, pp. 162906-1 - 162906-5, 2013. [4] Z. Xuewei, J. K. Nowocin; ―Effects of AC modulation frequency and amplitude on kerr electro-optic field mapping measurements in transformer oil‖, in Annu. Rep. IEEE Conf. Elect. Insul. Dielectr. Phenomena, (CEIDP), pp. 700 – 704, 2012. [5] L. Yang, S. M. Gubanski et al., ―Dielectric properties of transformer oils for HVDC applications‖, IEEE Trans. Dielectr. Electr. Insul. vol. 19, no. 6, pp. 1926-1933, 2012. [6] O. Hjortstam, J. Schiessling et al., ―Measurement of ion mobility in transformer oil: Evaluation in terms of ion drift‖, in Annu. Rep. IEEE Conf. Elect. Insul. Dielectr. Phenomena, (CEIDP), pp. 495-498, 2012. [7] L. Yang, M. S. Zadeh et al., ―Measurement of ion mobility in transformer oils for HVDC applications‖, in proc. Int. Conf. High Voltage Eng. Appl. (ICHVE), pp. 464-467, 2012. [8] R. B. Jadav, T. K.Saha et al., ―Multifractal analysis on polarisation and depolarisation current of the transformer insulation‖, in 22st Australasian Uni. Power Engg. Conf. (AUPEC), pp. 1-6, 2012. [9] A. D. Ashkezari, M. Hui et al., ―Multivariate analysis for correlations among different transformer oil parameters to determine transformer health index‖, in Proc. IEEE Power, Energy Soc. General Meeting, pp. 1-7, 2012. [10] J. G. Hwang, M. Zahn et al., ―Mechanisms behind positive streamers and their distinct propagation modes in transformer oil‖, IEEE Trans. Dielectr. Electr. Insul., vol. 19, no. 1, pp. 162-174, 2012. [11] W. Ziomek, K. Vijayan et al., ―High voltage power transformer insulation design‖, in Proc. Conf. Electr. Insul. (EIC), pp. 211-215, 2011. [12] R. Liu, L. A. A. Pettersson et al., ―Fundamental research on the application of nano dielectrics to transformers‖ in Annu. Rep. IEEE Conf. Elect. Insul. Dielectr. Phenomena, (CEIDP), pp. 423-427, 2011. [13] J. Jadidian, J.G. Hwang et al., ―Streamer initiation and propagation in transformer oil under positive and negative impulse voltages‖, in Proc. Conf. IEEE Pulsed Power (PPC), pp. 251 – 256, 2011. [14] J. Jadidian, J. G. Hwang et al., ―Migration-ohmic charge transport in liquid-solid insulation systems‖, in Proc. IEEE Int. Conf. Dielectr. Liquids (ICDL), pp. 1 – 4, 2011. [15] R. Liao, Z. Hanbo et al., ―An Integrated Decision-Making Model for Condition Assessment of Power Transformers Using Fuzzy Approach and Evidential Reasoning‖, IEEE Trans. Power Del., vol. 26, no. 2, pp. 1111-1118, 2011. [16] J. G. Hwang, M. Zahn et al., ―Effects of nano particle charging on streamer development in transformer oil-based nanofluids‖, Appl. Physics J., vol. 107, no.1, pp. 014310-014317, 2010. [17] R. Liu, C. Tornkvist et al., ―Geometry impact on streamer propagation in transformer insulation liquids‖, in Annu. Rep. IEEE Conf. Elect. Insul. Dielectr. Phenomena, (CEIDP), pp. 1-4, 2010. [18] J. G. Hwang, M. Zahn et al., ―Modeling streamers in transformer oil: The transitional fast 3rd mode streamer‖, in Proc. 9th IEEE Int. Conf. Proper. Appl. Dielectr. Mater., (ICPADM), pp. 573-578, 2009. [19] F. O'Sullivan, J. G. Hwang et al., ―A Model for the Initiation and Propagation of Positive Streamers in Transformer Oil‖, in Conf. Record IEEE Int. Symp. Electr. Insul.,(ISEI), pp. 210 – 214, 2008. [20] F. O'Sullivan, S. H. Lee et al., ―Modeling the Effect of Ionic Dissociation on Charge Transport in Transformer Oil‖, in Annu. Rep. IEEE Conf. Elect. Insul. Dielectr. Phenomena, (CEIDP), pp 756-759, 2006.

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Table 1. Year wise Comparison of Research papers

With reference to J. Singh, Y. R. Sood et al., “Conditioning Monitoring of Power Transformers- Bibliography Present Paper Sr. Research Area Survey” IEEE Electr. Insul. Mag., No vol. 24, no. 3, pp. 11-25, 2008.

Year No of paper Year No of paper 1 Dissolve Gas Analysis (DGA) (1975-2007) 87 (2008-2014) 67 2 Moisture (1984-2006) 15 (2007-2014) 49 3 Dielectric Response (1994-2007) 43 (2008-2014) 27 4 Fault Diagnosis Not Collected (2008-2014) 12 5 Conditioning Monitoring (1985-2007) 77 (2008-2014) 13 6 Insulation (Oil & paper) (1977-2006) 116 (2007-2014) 58 7 Mechanical strength (1975-2006) 43 (2007-2014) 38 8 Thermal Conductivity Not Collected (2000-2014) 11 9 Partial Discharge (PD) (1988-2006) 40 (2007-2014) 33 10 Thermal Degradation (1981-2006) 20 (2007-2014) 19 11 Ageing Study and life time Not Collected (2007-2014) 03 estimation 12 Alternative insulation Not Collected (2000-2014) 21 13 Copper Sulphur Not Collected (2000-2014) 25 14 Bubble Effect New Field (2000-2014) 06 15 Drying process Not Collected (2008-2014) 09 16 Other important Topics Not Collected (2005-2013) 20

XVIII. CONCLUSION

This paper gives an overview of concept of power transformer with a bibliographical survey of literature. This paper will be helpful in the academics, research and engineering community in worldwide which is working on transformer. There is a worldwide need for up-to-date bibliographic information on power transformer insulation in the academic, research and engineering communities. The same topic was earlier updated in 2008 and it is observed that many new areas have been identified by the researchers such as bubble effect, copper sulphur, mechanical strength, etc. This article lists relevant references grouped according to the topics described above.

BIOGRAPHIES

Dr. Jashandeep Singh was born in Ludhiana (Punjab), India. He obtained his Diploma in Electrical Engineering in 1999, B. Tech in Electrical Engineering, M. Tech & Ph.D from NIT Hamirpur in 2002, 2004, 2011 respectively. He is presently working as Principal, Rayat Bahra Group of Institutions, Patiala Campus. His research interests are energy management, transformer diagnosis and electrical machines. He may be contacted at [email protected].

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