03_correla_loss_E - Paper accepted for presentation at 2003...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Paper accepted for presentation at 2003 IEEE Bologna PowerTech Conference, June 23-26, Bologna, Italy Electrical and Mechanical Strength of Mineral Filled Epoxy Insulators in Correlation to Power Loss Factor F. Gerdmand, M. Budde, M. Kurrat Institute for High-Voltage Technology and Electric Power Systems Technical University Braunschweig, Germany Abslracl--Polymeric materials like mineral filled and fibre reinforced epoxy resins were applicated in many power apparatus for electric insulation. Compared to ceramic and glass the cornparite insulators based on mineral filled polymers have many advantages. Epoxies offer new passibilities in developing electric insulations, especially to reach more compact design in electric power equipment. Due to their good adaptability, their convenient manufacturing technology, their very good electric and mechanical prnperties mineral fied epoxies are the preferred duromeric materials for many high quality insulating systems. These materials for outdoor use show ageing phenomena under environmental stress which is not exactly known up to now. For this reason it is important to get a reliable state of estimation with loss factor and partial discharge measurement. Mineral filled epoxy test specimens are aged by water immersion. The factor, the partial discharges, the electric and mechanical properties are measured in selected time intervals. Index Terms-dielectric diagnostic tools, high voltage composite insulation, material ageing, partial discharges. I. INTRODUCTION geing effects in polymeric materials are well known A since .' the beginning of their application in high-voltage equipment. Composite insulation based on mineral filled and fibre reinforced epoxy resins becomes more and more popular because of the simplicity of designing and manufacturing. Polymeric materials allow an adaptive design in insulation techniques. In many cases there are cost advantages because of the possibility of automatic manufacturing processes On the other hand outdoor and indoor insulation systems in condition of high humidity, partial discharges (PD) and mechanical overstresses lead to lifetime reduction. Aims of this investigation is the extension of operating time due to economical reasons, reduction maintenance and monitoring dielectric properties under environmental stress. Furthermore for an economic design it is very important to know the main ageing mechanisms and their effects the mechanical and electric material parameters. The authors would like to thaok the DEUTSCfIE FORSCHUNGS- GEMEINSCW for their hancial support. They also wish to express the" graiimde CO Vmtiw AG, Switzerland, and Qumerke Frechen GmbH. Germany, for SUPWR. 0-7803-7967-5/03/$17.00 02003 IEEE The exact knowledge of the degradation state and the residual life of the material used in a specific insulation is needed. Composite insulation consists of an organic polymeric matrix, i. e. epoxy, which is filled or reinforced with mineral powder, glass fibre or wollastonite. For suspension or post-insulators in outdoor applications crystalline quartz powder as a suitable filler is often used.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 06/11/2011 for the course ELECTRICAL 124 taught by Professor Ghjk during the Spring '11 term at Institute of Technology.

Page1 / 5

03_correla_loss_E - Paper accepted for presentation at 2003...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online