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Failure Analysis for Disconnector Current Transfer Contact Falling off GIS Gas Chamber

The withstand voltage test of GIS gas chamber disconnector in a new project of transformer substation was not passed. When the cover of the GIS gas chamber was opened, it was found that phase B of “E” rings current transfer contact and the corresponding accessories fell on the basin insulator at the...

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Bibliographic Details
Published in:IOP conference series. Earth and environmental science 2021-03, Vol.687 (1), p.12128
Main Authors: Rong, Huang, Yi, Xie, Kejian, Ouyang, Xianhui, Cao, Chao, Feng, Jun, Wang
Format: Article
Language:English
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Summary:The withstand voltage test of GIS gas chamber disconnector in a new project of transformer substation was not passed. When the cover of the GIS gas chamber was opened, it was found that phase B of “E” rings current transfer contact and the corresponding accessories fell on the basin insulator at the bottom, and the current transfer contact falling off was the main reason for failing the withstand voltage test. Failed phase B & phase A of “E” rings and new sample were analyzed by size and weight test, hardness test, metallographic structure analysis, clamping force calculation and scanning electron microscopy (SEM) analysis. The analysis results show that the thickness value of “E” rings was less than standard value and the weight was not qualified, especially opening width and hardness of failed “E” rings were unqualified and had abnormal microstructure. Unqualified “E” rings and clamp failure caused current transfer contact to fall off.
ISSN:1755-1307
1755-1315
DOI:10.1088/1755-1315/687/1/012128