Based on the phenomenon of defective GIS gas chamber under operating voltage producing ultrasonicwave

electromagnetic wave and SF

6

gas decomposition products

the author uses acoustic-electric-gas combineddetection method to find and diagnose two typical defects in GIS gas chamber

which are verified by overhaulinspection

and accumulated experience for the future GIS equipment defect diagnosis. The case of defects detectionand diagnosis process show that the different detection methods are applicable to the different defect types whencarrying out the live detection

the two detection methods of ultra high frequency method and ultrasonic method foranalysis and diagnosis of GIS equipment defect types have some shortcomings and limitations

the two methods havetheir own advantages and disadvantages

both between the two can’t be fully inclusive

and there is a bigintersection. Gas decomposition product method can be used as an auxiliary means for defect analysis and diagnosis.This paper summarized the combined detection of charged GIS detection equipment should be carried out withultrasonic

UHF and gas detection method

to form complementary advantages and achieve the purpose of accuratediagnosis and localization of GIS internal latent defects. At the same time

it also emphasizes that we shouldstrengthen the factory monitoring and factory test witness

so as to avoid the defective equipment into the power grid

eliminate the defects in the initial state.