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20181112-Full ELECTROTECHNICA & ELECTRONICA E+E Vol. 53. No 11-12/2018 Monthly scientific and technical journal Published by: The Union of Electronics, Electrical Engineering and Telecommunications /CEEC/, BULGARIA Editor-in-chief: C O N T E N T S Prof. Ivan Yatchev, Bulgaria ELECTRICAL ENGINEERING Deputy Editor-in-chief: Prof. Seferin Mirtchev, Bulgaria Vikas Gakwad, Angel Tcolov, Ivan Yatchev Editorial Board: Analysis of Typical Faults in the real grid Prof. Anatoliy Aleksandrov, Bulgaria of 22 kV Roha town feeder (India) 279 Acad. Prof. Chavdar Rumenin, Bulgaria Prof. Christian Magele, Austria Plamen Tzvetkov, Krasimir Galabov, Ivan Kodjabashev Prof. Georgi Stoyanov, Bulgaria Prof. Evdokia Sotirova, Bulgaria Some features and opportunities for calibration Prof. Ewen Ritchie, Denmark of analyzers of electric power by total harmonic distortion 285 Prof. Hannes Toepfer, Germany Dr. Hartmut Brauer, Germany Ivaylo Nedelchev Prof. Marin Hristov, Bulgaria Hysteresis loss analysis of magnetic materials Prof. Maurizio Repetto, Italy with data acquisition system 289 Prof. Mihail Antchev, Bulgaria Prof. Nikolay Mihailov, Bulgaria ELECTRONICS Prof. Radi Romansky, Bulgaria Prof. Rosen Vasilev, Bulgaria Atanas Tanev Prof. Takeshi Tanaka, Japan Overview of gyrator based G -C filters Prof. Ventsislav Valchev, Bulgaria m Dr. Vladimir Shelyagin, Ukraine and their applications 296 Acad. Prof. Yuriy I. Yakymenko, Ukraine Assoc. Prof. Zahari Zarkov, Bulgaria TELECOMMUNICATIONS SCIENCE Advisory Board: Krume Andreev, Rumen Arnaudov, Ivo Dochev Prof. Dimitar Rachev, Bulgaria In-flight sensor system for collecting flight information Prof. Emil Sokolov, Bulgaria Corr. Member Prof. Georgi Mladenov, Bulgaria and providing flight safety of unmanned aerial system 305 Prof. Ivan Dotsinski, Bulgaria Assoc. Prof. Ivan Vassilev, Bulgaria Ivo Dochev, Liljana Docheva, Maria Pavlova Assoc. Prof. Ivan Shishkov, Bulgaria A remote controlled system implementation Prof. Jecho Kostov, Bulgaria for object video monitoring 310 Prof. Lyudmil Dakovski, Bulgaria Prof. Mintcho Mintchev, Bulgaria COMPUTER SCIENCE Prof. Nickolay Velchev, Bulgaria Assoc. Prof. Petar Popov, Bulgaria Stella Vetova, Ivo Draganov, Ivan Ivanov Prof. Rumena Stancheva, Bulgaria CBIR with dual tree complex wavelet transform Prof. Stefan Tabakov, Bulgaria using maximally flat all-pass filter 314 Technical editor: Zahari Zarkov Corresponding address: Takeshi Tanaka, Nobuharu Okamitsu, Noriyuki Yamada, 108 Rakovski St. Toyoharu Takemoto, Katia Vutova Sofia 1000 Construction of a preliminary educational system for file BULGARIA backup system using secret sharing technique 321 Tel. +359 2 987 97 67 e-mail: [email protected] http://epluse.fnts.bg In 2018, the journal Electrotechnica & Electronica is ISSN 0861-4717 published with the financial support of the Scientific Research Fund at the Ministry of Education and Science. ELECTRICAL ENGINEERING Analysis of typical faults in the real grid of 22 kV Roha town feeder (India) Vikas Gaikwad, Angel Tcolov, Ivan Yatchev Abstract-- The fault analysis and evaluation of fault voltage and current in the power system net- work is very important for a stable and reliable operation of the power system. In the present paper, a study of various reasons for faults in a real grid is carried out and various methods of localizing the fault are also discussed. All the analyses of the faults have being performed on the real grid of 22KV of Roha town feeder. The data of last three years including parameters like time of faults, maximum downtime, voltage before and after the fault, current before and after the fault, power before and after the fault are considered for the analysis. The study undertaken herewith is an attempt to develop a methodology and framework for achieving better and reliable energy supply. Introduction While considering 22kv real grid, some of the com- The use of electricity increases day by day, where- mon causes of failure of the grid are lightning, high as technology is developed to utilize electrical energy speed wind, earthquakes etc. There may be some ac- in an optimal way. Electrical energy is transmitted and cidental faults such as fall of tree branches on lines, distributed from one place to another place via mas- vehicles colliding with poles [2]. sively interconnected power systems. In power sta- The process of calculation of system voltages and tion, electrical energy is generated and for the same currents under various types of short-circuiting power to be transmitted through transmission lines lot conditions is called fault analysis. Analysis of fault is of infrastructure, i.e. substations, power stations and required to improve quality and reliability of customer power lines are required. These lines are mainly di- service. Fault current may change from time to time. vided into EHV and medium voltage lines. As per the Therefore a suitable fault analysis method is required design of equipment, normal current is flowing. Any for different fault currents, so that new setting of the increase in the current levels of the power systems, protective elements takes place. (sectionalize switch- this faulty current will flow through the complete es, auto reclosers, and fuses). Fault analysis can also equipment. The fault phenomenon affects the com- be useful to estimate the size of the other fault current plete system dependability, reliability and quality of limiters or reactors which may be required to be in- energy supply. serted into the system to minimize the short-circuit In 1956, L.W. Coombe and D. G. Lewis proposed currents to an optimum safe value which is below the the primary fault analysis program. Several exiting rated capacity of the installed circuit-breakers. Usual- texts provide an extensive analysis in fault studies and ly, the effect of load is neglected during the short- calculation [1]-[7]. In power system studies, the eval- circuit analysis. uation of fault analysis is very important. In this pa- per, we provide three years data of different types of Roha town feeder data faults, voltages and currents and design of an appro- The Roha town feeder data is taken into considera- priate protecting scheme for the power system. The tion for our analysis. 100/22 kV sub-station is having main task is to calculate fault conditions and provide 100 kV incomer line and connected to two power protecting equipment designed to isolate the faulty transformers of capacity 25 MVA. From the common part of lines. Fault analysis is divided into two groups- bus bars of the two transformers 11 feeders are ema- unsymmetrical and symmetrical faults. In this paper, nating. Out of 11 feeders,4 feeders are shown in Fig. we discuss only unsymmetrical faults ( line to 1. This substation supplies power to Roha town and ground, line to line and double line to ground faults). Dhatav industrial area. “Е+Е”, vol. 53, 11-12, 2018 279 Fig.1. Roha 100kV/22 kV substation. The subject of consideration in this paper will be one of the feeders, shown in Fig. 2. Relay and the terminal block picture of Roha town feeder are shown Fig.2. Single line diagram of the Roha town feeder. in Fig. 3. Abbreviations used in Fig. 1 and Fig. 2 are listed below: DTC- Distribution Transforner Center AB switch- Air Brake Switch HT- High Tention line ISOL or ISC- Isolaters VCB-Vaccume Circuit Breaker CT-Current Transformer LA-Lightning Arrester YPH- Y Phase BPH- B Phase CTR-Current Ratio Fig.3. Relay and the terminal block picture of Roha town CGL- Crompton Greaves Ltd. feeder. ACSR- Aluminum Conducted Steel Reinforced The past three years (2014, 2015 and 2016) data Fig. 4 shows the data collection in Excel file with are taken and maintained in an MS Excel sheet with all the parameters noted down on a time basis. the following parameters. The subject of consideration in this paper will be one of the feeders, shown in Fig. 2. Relay and the terminal block picture of Roha town feeder are shown in Fig. 3.The past three years (2014, 2015 and 2016) data are taken and maintained in an MS Excel sheet with the following parameters. 1. Tripping time. 2. Duration of Break down. 3. The reason for Break down. 4. Voltage, Current, Power and Frequency before and after tripping. 5. Protection operated. Fig.4. Excel sheet of monthly data collected. 280 “Е+Е”, vol. 53, 11-12, 2018 Table 1 Table 3 Notations used in Fig.4 Type and number of faults in the year 2015 Parameter Notation Type of Faults Number of Faults in 2015 V 22 kV Voltage L to G 271 R R Phase Current L to L 38 Y Y Phase Current 2L to G 11 B B Phase Current LLL 0 E Ground Current LLLG 0 F System Frequency Shutdowns 54 P Power Fault statistics and analysis There are lots of possibilities for generation of faults in the overhead transmission lines and the dis- tribution lines. Some of the studied faults are as fol- lows • L to G - Single line to ground faults • L to L - Line to line faults • 2L to G - Double line to ground faults Table 2 and Fig. 5 illustrate the type of faults and their respective numbers in the year 2014. It could be clearly seen that the Line to ground faults are domi- Fig.6. Number of faults in the year 2015 in the Roha town nating in comparison with other faults. The Line to feeder. ground faults are 82.63% of the faults throughout the year. Table 4 and Fig. 7 illustrate the type of faults and Table 2 their respective numbers in the year 2016. It could be Type and number of faults in the year 2014 seen that the Line to ground faults are again dominat- Type of Faults Number of Faults in 2014 ing. The Line to ground faults form 76.82% of the L to G 238 total faults throughout the year. L to L 42 Table 4 2L to G 6 Type and number of faults in the year 2016 LLL 2 LLLG 0 Type of Faults Number of Faults in 2016 Shutdowns 81 L to G 252 L to L 62 2L to G 13 LLL 0 LLLG 1 Shutdowns 56 Fig.5.
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