Investigation of the ageing process in polymeric insulators by using improved Weibull statistics

Mukden Ugur*, Ayten Kuntman, Ahmet Merev

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

7 Citations (Scopus)

Abstract

Surface tracking on organic solid insulators is one of the main reasons for failure in high voltage (HV) systems. Due to various factors, such as humidity, pollution, ice load, increase in local voltage, etc., it is hard to make an estimation about the life of an insulator. For many years Weibull statistics have been widely used and accepted as a successful mathematical method to predict the remaining lifetime of an insulating material. The basic reliability function R(t) = e(-λrm), where 'λ' is the scale and 'm' is the shape parameter, can perform well for certain conditions, however it might be insufficient in lifetime prediction in multi-variable conditions. In this research several tests have been performed according to IEC 587 Inclined Plane Test method to investigate the breakdown times of polymeric insulation materials under various external conditions generated artificially in laboratory. These factors seemed to reduce the lifetime of insulating materials up to 50-70 percent. A model based on Weibull statistics has been proposed for estimating the breakdown time of polymeric insulation material. By using appropriate parameters this improved model can make successful estimates within a reasonable accuracy in varying external conditions such as tensile stress or increased surface hydrophobicity, etc.

Original languageEnglish
Title of host publicationConference Record of the the 2002 IEEE International Symposium on Electrical Insulation
PublisherIEEE Institute of Electrical and Electronic Engineers
Pages275-279
ISBN (Print)0-7803-7337-5
DOIs
Publication statusPublished - 2002
MoE publication typeA4 Article in a conference publication
Event2002 IEEE International Symposium on Electrical Insulation - Boston, MA, United States
Duration: 7 Apr 200210 Apr 2002

Publication series

SeriesIEEE International Symposium on Electrical Insulation
ISSN0164-2006

Conference

Conference2002 IEEE International Symposium on Electrical Insulation
Country/TerritoryUnited States
CityBoston, MA
Period7/04/0210/04/02

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