DOCSLIB.ORG

Cellulose Based Electrical Insulation

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Cellulose Based Electrical Insulation . Cellulose-based electrical insulation REBECCA HOLLERTZ Supervised by Lars Wågberg and Claire Pitois DIELECTRIC INTRODUCTION PROPERTIES The aim of this PhD-project is to use novel A more efficient electrical energy generation and modification routes for wood-fibres, such as nano Increasing voltage levels transmission will be increasingly vital to meet Demand for fibrillation and layer-by-layer (LbL) adsorption of Permittivity and dielectric growing societal needs. The major failures in oil- improved electrical loss are important dielectric filled high voltage transformers, a key component modifying components to clarify the influence of Integration of renewables insulation properties which affect the in power transmission networks (with paper and chemistry and morphology on relevant electrical materials loss of energy and the build- pressboard used as the solid insulation material), phenomena and improve the electrical insulating Increased reliability up of electric fields in the are related to the insulation material. capability of wood-fibre based electrical insulation. insulator, and at inter-faces. The dielectric strength is used to describe the RESULTS AND OUTLOOK maximum electric field a material can with-stand * before flash-over or short- 1. Streamer inception and propagation circuiting. Before experiencing break- Streamer inception down, the insulating material is often subjected to deteriorating discharges and streamers which can also be triggered and analysed in the laboratory. Streamers, conducting gaseous channels which can travel in high speed, at oil- pressboard inter-faces have been identified as a signi- ficant cause responsible for PAPER transformer failures. The ultimate goal of this PhD project is a better The setup constructed gives valuable information about streamer inception and propagation at the solid-liquid interface and understanding of which will be used to characterize the influence of the solid material by testing different polymers and modified paper sheets. paper properties are most critical, and should Some of the parameters investigated are porosity, surface roughness, polarizability and electron affinity. consequently be altered, to control the streamer inception and propagation. 2. Silica nanoparticle modified papers to enhance dielectric properties ** ABOUT ME This study showed that the layer-by-layer technique provides an efficient method to tailor the dielectric and mechanical properties of wood-fibre-based electrical insulation materials with the aid of polyelectrolytes and inorganic nanoparticles. Papers were prepared from fibres where silica nanoparticles had been pre-adsorbed onto the fibres using the layer-by-layer (LbL) technique. Education: M.Sc. in Engineering 2008 Licentiate Thesis 2014 Ph.D. planned 2016 *** 3. Effect of composition and morphology on the dielectric response Research interest: Polymer Science a. Dielectric spectroscopy on paper samples b. Spectroscopic ellipsometry on model surfaces Pulp and Paper Chemistry Dielectrics Nanotechnology Model surfaces of pure lignin and glucomannan Setup for dielectric measurements in vacuum. IN COOPERATION WITH: The dielectric response is highly dependent on density since paper is the high-permittivity and high-loss component in the oil- paper system. The morphology of the paper does not affect the dielectric response Lignin contributes to increased charge transport and polarizability for the investigated materials in studied frequency ranges. KTH ROYAL INSTITUTE OF TECHNOLOGY Rebecca Hollertz KTH Royal Institute of Technology Email: [email protected] PhD-Student School of Chemistry Department of Fibre and Polymer Technology Teknikringen 56 * David Ariza, Marley Beccera, Rebecca Hollerz, Claire Pitois, , IEEE Conference on Electrical Insulation and Dielectric Phenomena, 2015 10044 Stockholm ** Rebecca Hollertz, David Ariza, Claire Pitois, Lars Wågberg, IEEE Conference on Electrical Insulation and Dielectric Phenomena, 2015 *** a. Rebecca Hollertz, Claire Pitois, Lars Wågberg , IEEE Transactions on Dielectrics and Electrical Insulation, 22, p 2239-2248, August 2015 and b. Rebecca Hollertz, Hans Arwin, Bertrand Faure, Yujia Zhang, Lennart Bergström, Lars Wågberg, Cellulose, 20, p. 639-1648, August 2013 .
Load more

Recommended publications
  • The Story of Paper, Trees and Printing Is a Product from (Forest in School in Denmark)
    William’s grandfather is a fore- ster. He lives in a red house in the The story of forest. Some of his trees shall be harvested and made into paper. But how do you actually make white paper out of 15 meter tall p trees and printing trees with bark and branches? aper How did people invent paper ma- king? What has paper got to do with photosynthesis? How does printing press work? And how to make your own recycled paper? William and his grandpa take a journey into the history of paper, trees, and printing. ”The story of paper, trees, and printing” can be used in science classes’ from grade 4. The book covers paper, forest, forestry, wood, photosynthesis, wood fibres, paper history, recycling, the environment, the climate, paper production, printing press - and much more. The story of paper, trees and printing is a product from www.skoven-i-skolen.dk, (Forest in School in Denmark). English version is available from www.leaf-international.org, Learning about Forests. Malene Bendix Artwork by Eva Wulff The story of trees paperand printing Malene Bendix Graphic Association of Denmark and Forests in School in Denmark. The story of paper, trees and printing Originally published by The Graphic Association of Denmark and Skoven i Skolen (Forest in School in Denmark) 2012. Author: Malene Bendix, Skoven i Skolen (Forest in School in Denmark) Artwork and graphic design: Eva Wulff, Grafisk Tegnestue. Printed version: The original publication in Danish was printed by Kailow Graphic. Kailow Graphic is certified by DS 49001, which is a standard for social responsibility and sustainable business operation.
    [Show full text]
  • Paper from Alternative Fibres the Facts
    Paper From Alternative Fibres The Facts The paper and paper packaging industry depend on an efficient, abundant and economically viable source of cellulose fibre to manufacture the huge variety of paper products we use today, like; newspapers, magazines, tissue, and paper packaging. Most commonly fibre is sourced from trees, a natural renewable and sustainable source but, cellulose can also come from other agricultural sources. What are ‘alternative fibres’? • Cotton and linen remain excellent papermaking fibres, with very high cellulose content. This gives superior The key ingredient in papermaking is cellulose, which is strength and a luxurious feel but comes at a higher cost. derived from the vegetable fibres found in trees and other plants. Wood fibre (including recycled fibre) is by far the most • Bamboo has similar technical characteristics to wood common source used in modern papermaking, due to its pulp and is used commercially in some parts of the world, cost-effective availability, relatively high proportion of cellulose particularly Asia, albeit in relatively small quantities. and reliable technical characteristics. Alternative fibres come • Bagasse, the fibrous residue after extraction of sugar from from grasses, seed hairs and other parts of plants (such as sugar cane, behaves similarly to straw but is more difficult bast fibres and leaves) and have historically been used too, to process. albeit in relatively low volumes. • Sugar beet, meanwhile, has some potential, particularly History because of a low lignin content (the ‘glue’ that binds fibre together, causing impurities in paper) but is unproven at Paper was traditionally made from clothing rags, and scale. sometimes plant material such as straw, until the mid-19th century.
    [Show full text]
  • Outlook for U.S. Paper and Paperboard Sector and Wood Fiber Supply in North America
    Chapter 5 - Outlook for U.S. paper and paperboard sector and Wood fiber supply in North America Mr. Peter J. Ince United States Forest Service U.S. Forest Products Laboratory, Madison, Wisconsin Abstract, Consumption of wood fiber in pulp, paper and paperboard increased in the United States over the past century and is projected to increase well into the next century at a decelerating rate of growth. Harvest of pulpwood on forest land is the single largest source of wood fiber, followed by recycled paper and wood residues. In the past decade, wood residues declined in supply while use of recycled paper increased rapidly. Use of recycled paper is projected to increase more steadily in the future with slower growth in paper recovery for recycling. Harvest of pulpwood on forest land is projected to remain the dominant source of U.S. fiber supply through the first half of the next century. Softwood pulpwood harvest on forest land is projected to increase as U.S. softwood residue supplies decline. Pulpwood stumpage values are projected to increase in the United States, based on supply and demand analysis, gradually improving economic opportunities for growing hardwood short-rotation woody crops on agricultural land. Hardwood pulpwood harvest on forest land is projected to increase for several decades but then decline in the long run with increasing fiber supply from agricultural short-rotation woody crops. Canada is projected to remain the principal source of U.S. pulp and paper imports, which are projected to increase. Most Canadian domestic pulpwood supply is projected to remain wood residues, as Canadian lumber production and residue output are projected to increase in the future.
    [Show full text]
  • The Bioeconomy Hub: Innovative Products from Biomass
    The Bioeconomy Hub: Innovative products from biomass Tim Caldecott and Douglas Singbeil Opportunities are everywhere! Building new connections and supply chain is the challenge. Composites Aerospace Food & Beverage Energy Automotive Fiber Construction © 2017 FPInnovations. Tous droits réservés. Reproduction et diffusion interdites. All rights reserved. Copying and redistribution prohibited. Biomass is bulky and expensive to transport Fibre supply chains need to be short and optimized. Better to process the biomass at a hub and send semi-finished or finished products to market. 3 © 2015 FPInnovations. All rights reserved. Copying and redistribution prohibited. ® FPInnovations, its marks and logos are trademarks of FPInnovations. Volume and Value Pulp/paper biofuels Sweet spot Market size Specialty chemical and materials Copyright FPInnovations © 2013. Do not reproduce without permission. 4 Source: “Thermochemical Strategies for Biofuels, Green Chemicals, © 2015 FPInnovations. AllPolymeric rights reserved. Biomaterials Copying and redistribution and Biofuels”, prohibited. Esteban® FPInnovations, Chornet, its marks Novemberand logos are tr ade2005marks. of FPInnovations. Value of residues from macro to nano New Wood Attributes • “green” substitutes • Light-weighting • Stronger • Stretchable • Improved aesthetics • New attributes • Not necessarily cheaper 5 © 2015 FPInnovations. All rights reserved. Copying and redistribution prohibited. ® FPInnovations, its marks and logos are trademarks of FPInnovations. The Bio-economy from a BC Context
    [Show full text]
  • The Effect of Pulping Upon the Dimensions of Wood Tracheids
    THE EFFECT OF PULPING UPON THE DIMENSIONS OF WOOD TRACHEIDS A. M. Scullan and H. V. Green l'olp and Paper Research Institute of Canada, Pointe Claire, P.Q., H9H 359 CANADA (Received 22 September 1975) ABSTRACT The dimensions of the fibres in oven-dry blocks of mood from three species (white spruce, 1)ouglas-fir, and larch) were deduced from measure~ilentsof bulk density and the number of fibres per unit cross-sectional area. The blocks \\.ere then cooked Ly the soda process to various yields, and the fibre dimensions were redeterlined after the blocks had been washed and oven-dried. The weight of the fibres per unit length decreased almost in proportion to the yield loss, I~eingreduced at 40% yield to 42% of its value in wood. This finding indicates that the fibres were shortened to only a small extent by pulping (ca. 4% at 40% yield) and that the major changes were in the transverse dimensions of the fibres. At 40%, yield, cell-wall thickness and fibre width were respectively rechlced to 52.5% and 84% of their original values. The results were independent of wood. species. The changes in the dimensions of the fibres are in keeping with current concepts of the structure of the cell wall. llrlditional keywords: Piceu glauca, Pset~rlotsugamenzie.~ii, Larix dccirlua, fiber dimensions, cell-wall thickness, fiber tliarnetcr, fiber length, soda pulping, yield, bulk density, wood, cross section. INTHODUCTION state using knowledge of moisture uptake ~h~ physical prope*ics of paper depend and the mode of swelling. Second, it is to a large extent upon the dimellsions of the possible that, as will be shown, the changes collstitllent fibres.
    [Show full text]
  • Wood Research the Influence of the Type And
    WOOD RESEARCH 52 (4): 2007 79-88 THE INFLUENCE OF THE TYPE AND PREPARATION OF LIGNOCELLULOSE FIBRES ON THE PROPERTIES OF MDF Piotr Borysiuk, Danuta Nicewicz, Jerzy Pawlicki , Marcin Klimczewski Faculty of Wood Technology (WTD) SGGW Warszawa, Warsaw, Poland ABSTRACT Th e infl uence of the type and preparation of lingo-cellulose fi bres on the properties of MDF. Th e possibilities of utilizing waste-paper were examined in the production of MDF. Two kinds of waste-paper (cardboard waste and mixed waste-paper) in two disintegration sizes each were used. Th e composition and length of fi bres and content of the Klasson lignin were examined. Th e following properties were obtained in the boards: bending strength, internal bond, modulus of elasticity and thickness swelling. It is apparent that paper fi bres can be added to wood fi bers in the production of MDF to a maximum of 30%. KEY WORDS: cardboard waste, mixed-waste paper, MDF, disintegration size of waste paper INTRODUCTION Th e limited supply of wood from the forest has initiated research in other materials for production of wood- panel boards. Investigations of the utilization of fi brous agricultural waste material and of high-molecular polymer are well-known and partially practised in industry. Waste paper is a recycled material which is not on the whole used in the production of paper. Th e production and consumption of paper increase every year, this is why waste paper resources will also increase. Th is is the reason why waste paper can be used in other branches of industry.
    [Show full text]
  • Outcomes and Evidence Requirements
    NZQA registered unit standard 3623 version 6 Page 1 of 4 Title Process crude tall oil from tall oil soap as a by-product of wood pulp manufacturing Level 4 Credits 5 Purpose People credited with this unit standard are able to: explain fundamentals of crude tall oil production; and cook black liquor soap for tall oil production. Classification Wood Fibre Manufacturing > Pulp and Paper - Chemical Plants Available grade Achieved Explanatory notes 1 Definition Worksite documentation refers to instructions to staff on policy and procedures (including the application of legislation to worksite situations) which are formally documented, and are available for reference at the worksite. Examples are standard operating procedures, specifications, manuals, and manufacturer’s information. 2 The reference text for this unit standard is Drew, J and Propst, M, Tall Oil (New York: Pulp Chemicals Association, 1981). It is available through http://www.pinechemicals.org/. 3 The following apply to the performance of all outcomes of this unit standard: a All work practices must meet recognised codes of practice and documented worksite health and safety and environmental procedures (where these exceed code) for personal, product, and worksite health and safety, and must meet the obligations required under current legislation, including the Health and Safety in Employment Act 1992, the Resource Management Act 1991, the Hazardous Substances and New Organisms Act 1996, and their subsequent amendments. b All work practices must meet documented worksite operating procedures. This includes the recording (by electronic or non-electronic means) of activities, events, and decisions. c All communications made in relation to this unit standard must be made in accordance with worksite procedures for content, recipient, timing, and method.
    [Show full text]
  • The Paperboard Product
    The paperboard product The paperboard product Since the mid-19th century the primary source of cellu- exceeds the amount of timber that is harvested. lose fibre has been wood. The fibre is separated by either This careful forest management ensures that even in the chemical or mechanical means from naturally occurring future the forests will form part of the sustainable cycle of species. In the case of Iggesund these species are mainly nature and be a permanent source of raw materials. spruce, pine and birch from managed forests in Scandina- The fibres in a tree trunk run parallel to its length. The via and elsewhere in Europe. Such forests are maintained fibre length varies according to the tree species. The rela- and expanded by the industries that rely on good access tionship is indicated by the table below. to timber. As a result of these efforts the stock of growing trees is increasing every year. In many areas growth now 4QSVDFæCSFrMPOHBOEçBU #JSDIæCSFrTIPSUBOEDZMJOESJDBM 1JOFæCSFrMPOHBOEçBU .JYFEæCSFTPGTQSVDF QJOFBOECJSDI Species Fibre length mm Fibre width μm Shape Spruce 3.1 – 3.5 19 – 50 Ribbon flat Pine 2.0 – 3.0 22 – 50 Ribbon flat Birch 0.9 – 1.2 20 – 35 Cylindrical with pointed ends IGGESUND PAPERBOARD | Reference Manual 17 The paperboard product Cellulose and the laws of nature Carbon dioxide and water are converted into simple glucose-based sugars by the action of sunlight on the OXYGEN (O2) CARBON DIOXIDE (CO2) green chlorophyll-containing cells of the plant kingdom. SUNLIGHT This process is known as photosynthesis and is accompa- nied by the emission of oxygen.
    [Show full text]
  • EPD Declaration
    ENVIRONMENTAL PRODUCT DECLARATION as per /ISO 14025/ and /EN 15804/ Owner of the Declaration GUTEX Holzfaserplattenwerk H. Henselmann GmbH + Co KG Programme holder Institut Bauen und Umwelt e.V. (IBU) Publisher Institut Bauen und Umwelt e.V. (IBU) Declaration number EPD-GTX-20140222-IBC2-EN ECO EPD Ref. No. ECO-00000978 Issue date 17.02.2015 Valid to 16.08.2020 Wood Fibre Insulating Boards GUTEX Holzfaserplattenwerk H. Henselmann GmbH + Co KG www.ibu-epd.com / https://epd-online.com Umwelt Produktdeklaration Name des Herstellers – Name des Produkts 1. General Information GUTEX Holzfaserplattenwerk Wood Fibre Insulating Boards Programme holder Owner of the Declaration IBU - Institut Bauen und Umwelt e.V. GUTEX Holzfaserplattenwerk Panoramastr. 1 H. Henselmann GmbH + Co KG 10178 Berlin Gutenburg 5 Germany 79761 Waldshut-Tiengen Declaration number Declared product / Declared unit EPD-GTX-20140222-IBC2-EN This Declaration refers to 1 m³ wood fibre insulating board manufactured in a dry process with an average weighted density of 173 kg/m³. For all other densities, the results can be calculated using the formula indicated in section 5. This Declaration is based on the Product Scope: Category Rules: This Declaration applies for wood fibre insulating board Betonzusatzmittel, 07.2014 manufactured in a dry process by GUTEX at its (PCR tested and approved by the SVR) location in Waldshut-Tiengen. This document is translated from the German Issue date Environmental Product Declaration into English. It is based on the German original version EPD-GTX- 17.02.2015 20140222-IBC2-DE. The verifier has no influence on the quality of the translation.
    [Show full text]
  • Cellulose-Based Electrical Insulation Materials Dielectric and Mechanical Properties REBECCA HOLLERTZ
    Cellulose-based electrical insulation materials Dielectric and mechanical properties REBECCA HOLLERTZ Doctoral thesis KTH Royal Institute of Technology School of Chemical Science and Engineering Department of Fibre and Polymer Technology ISBN 978-91-7729-327-9 TRITA – CHE-report 2017:21 ISSN 1654-1081 Tryck: US-AB, Stockholm, 2017 The following papers are reprinted with permission from: Paper I: Springer Papers II, III, VII and VIII: IEEE Transactions on Dielectric and Electrical Insulation AKADEMISK AVHANDLING Som med tillstånd av Kungliga Tekniska högskolan i Stockholm framläggs till offentlig granskning för avläggande av teknologie doktorsexamen fredagen den 12 maj 2017, kl. 10.00 i F3, Lindstedtsvägen 26, KTH, Stockholm. Avhandlingen försvaras på engelska. Fakultetsopponent: Professor Markus Biesalski, TU Darmstadt, Tyskland Copyright© Rebecca Hollertz, 2017 ABSTRACT The reliability of the generation and distribution of electricity is highly dependent on electrical insulation and is essential for the prosperity of our society and a ubiquitous part of our everyday life. The present study shows how some important material properties affect the electrical properties of cellulose-based electrical insulation systems which are used together with mineral oil in high-voltage transformers. Among other things, the effects of paper density and of the lignin content of the fibres on the dielectric response and charge transport of the papers have been studied. The underlying mechanisms of the inception and propagation of streamers, responsible for the most costly failures in transformers, at the oil-solid interface have been investigated and the important role of paper morphology on streamer propagation has been demonstrated. With papers, in contrast to films of synthetic polymers and microfibrillated cellulose, the branching of streamers increased and the length of slow negative streamers decreased.
    [Show full text]
  • Joint Wood Energy Enquiry: 2015 Data Publication Date
    Joint Wood Energy Enquiry: 2015 data Publication date: 1 February 2018 Coverage: United Kingdom Geographical None breakdown: Introduction The Joint Wood Energy Enquiry (JWEE) collects data on woodfuel supply and use. Statistics are collected every 2 years by the United Nations Economic Commission for Europe (UNECE). UK data that is submitted to UNECE via the Joint Wood Energy Enquiry is published biennially at: www.forestry.gov.uk/forestry/infd-8ekjqc The attached tables show data for 2015 that was submitted to UNECE in early 2017. Estimates for table T IV are shown for the first time in this return. Estimates for tables T I and T II have been previously published by the Forestry Commission (Joint Forest Sector Questionnaire: final 2015 data), but may not reflect more recent revisions. Notes: The following sheets are provided: Overview Summary results and time series. T I fibre sources Estimates of production, imports and exports of wood. Covers wood for energy and material use. T II processed Estimates of production, imports and exports for wood charcoal and wood woodbased fuels pellets T IV energy use Estimates of wood used for energy production by the different sectors, by source of fibres. Conversion factors Conversion factors assumed in this return. Many are default factors supplied by UNECE. User information Guidance from UNECE on data quality categories and on definitions. Next update: Date to be confirmed Issued by: IFOS - Statistics, Forest Research, 232 Corstorphine Road, Edinburgh, EH12 7AT Enquiries: Jackie Watson 0300 067 5238 [email protected] Statistician: Sheila Ward www.forestry.gov.uk/statistics UNECE/FAO FORESTRY AND TIMBER SECTION JOINT WOOD ENERGY ENQUIRY v 6.21 © 2016 UNECE/FAO Forestry and Timber Section - In case of any uncertainties or questions on the JWEE 2015 please contact: [email protected] Please select country: United Kingdom Year: 2015 Content All sheets are protected but without a password Introduction Overview sheet, please choose your country here.
    [Show full text]
  • Substituting Wood with Nonwood Fibers in Papermaking: a Win-Win Solution for Bangladesh
    Bangladesh Development Research Working Paper Series (BDRWPS) BDRWPS No. 4 (January 2009) Substituting Wood with Nonwood Fibers in Papermaking: A Win-Win Solution for Bangladesh M. Sarwar Jahan Bangladesh Council of Scientific & Industrial Research (BCSIR) Bernhard G. Gunter Bangladesh Development Research Center (BDRC) and A. F. M. Ataur Rahman Department of Economics, North South University (NSU) Bangladesh Development Research Center (BDRC) The views and interpretations in this paper are those of the author(s) and do not necessarily represent those of the Bangladesh Development Research Center (BDRC). Copyright © 2009 Bangladesh Development Research Center (BDRC) for the overall Working Paper Series. The copyright of the content of the paper remains with the author(s) and/or the institution(s) submitting the content. Bangladesh Development Research Center (BDRC) 2508 Fowler Street Falls Church, VA 22046-2012, U.S.A. Tel. +1 703 532 4893 E-Mail: [email protected] http://www.bangladeshstudies.org Rights and Permissions All rights reserved. Text and graphics may be reproduced in whole or in part and in any form for educational or non-profit purposes, provided that credit is given to the source. Reproductions for commercial purposes are forbidden. The Bangladesh Development Research Center (BDRC) disseminates the findings of work in progress to encourage the exchange of ideas about development issues in Bangladesh. Our main objective is to disseminate findings and ideas quickly, so we compromise to some degree on quality. The papers are signed by the author(s) and should be cited and referred accordingly. The findings, interpretations, and conclusions expressed in this paper are entirely those of the author(s).
    [Show full text]