ZHOU Bo, GAO Jun, YANG Hongquan, et al. Case Analysis on Suspension Discharge Defect of 220 kV GIS Disconnecting Switch[J]. High voltageapparatus, 2020, 56(12): 308-312.
ZHOU Bo, GAO Jun, YANG Hongquan, et al. Case Analysis on Suspension Discharge Defect of 220 kV GIS Disconnecting Switch[J]. High voltageapparatus, 2020, 56(12): 308-312. DOI: 10.13296/j.1001-1609.hva.2020.12.043.
This paper introduces a typical suspension discharge defect of 220 kV GIS disconnecting switch(DS) of a substation in Chengdu
which is found by live testing.Firstly
a suspension discharge in the gas chamber of a GIS disconnecting switch was detected due to the presence of the abnormal UHF signal and SF
6
decomposition products.Then
after the gas chamber was opened
it is discovered that the equipotential spring may have lost tension and cannot operate satisfactorily during long-term work.This made it impossible to keep the reliable electric contact between the shifting fork and the drive shaft pin
and therefore a suspension discharge easily happened at this place.The DS discharge case in this paper can provide helpful experience and reference for the detection and process