GIS (Gas-Insulated Switchgear) characterizes with many merits such as high reliability,easy-maintenance, small volume, and receives widely application in the world.
Even though, due to testing devices and techniques, there are still quite large amout of GIS never undergo strict fields test for earlier applications. it happens that insulation problem is still an improtant issue for fields maintenance, from which it aroses many methods to conduct insulation experiment, such as chemical analyzing method, pulse, ultrasonic and UHF method.
From the experience, there are certain kind of defect, which can not be anyharm and not easy to detect, will exemplify themselves in the later years, especially when CB operates, partial discharge occures that may result in large accident and maintenance has to be in power-off conditions so as to lead to large economic loss.
There are some insulation faults happened in Guangdong province, China:
Jiangmen 500kVGIS, DayaWan 400kVGIS, Shenzhen Huanggang station220kVGIS, ShajiaoA power plant220kVGIS.
Especially for Shajiao A plant, in the year of 1989, a 220kVGIS N.3 faults result in loss of 32GW.h.
Edited by J.Zh
IEEETM Center
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