Electrical aging tests on epoxy insulators in GIS

Author

Diessner, A. ; Luxa, G. ; Neyer, W.

Author_Institution

Siemens AG, Berlin, West Germany

Volume

24

Issue

2

fYear

1989

fDate

4/1/1989 12:00:00 AM

Firstpage

277

Lastpage

283

Abstract

Due to the relatively small insulator dimensions in gas-insulated switchgear (GIS), the electrical stressing is high by comparison to that of insulators for conventional switchgear. Aging tests on a large number of full-sized insulators in several vessels in an outdoor test station have been carried out to determine the stress limits. The tests, with voltages of several hundred kilovolts, last for several years. The aim is to work out conditions (by extrapolation) for a trouble-free switchgear operating life of at least 50 years. The most important test objects are postinsulators weighing 2 kg each. It has been confirmed that partial discharges have a major effect on the failure probability. The life curve obtained from the test results of six batches of partial-discharge-free insulators is compared with the required reliability data

Keywords

ageing; environmental testing; gaseous insulation; insulators; life testing; organic insulating materials; polymers; reliability; switchgear; 2 kg; 50 years; GIS; aging tests; electrical stressing; epoxy insulators; failure probability; full-sized insulators; gas-insulated switchgear; insulator dimensions; life curve; outdoor test station; partial discharges; partial-discharge-free insulators; postinsulators; reliability data; stress limits; test objects; test results; trouble-free switchgear operating life; Aging; Dielectrics and electrical insulation; Extrapolation; Gas insulation; Geographic Information Systems; Insulator testing; Partial discharges; Stress; Switchgear; Voltage;

fLanguage

English

Journal_Title

Electrical Insulation, IEEE Transactions on

Publisher

ieee

ISSN

0018-9367

Type

jour

DOI

10.1109/14.90286

Filename

90286