LI Songyuan, WANG Yongning, SONG Xiaobo, et al. Application of Combined Acoustic-electric-chemical Detection to GIS Partial Discharge Defect Caused by Free Metal Particles[J]. High voltageapparatus, 2016, 52(9): 78-82+90.
LI Songyuan, WANG Yongning, SONG Xiaobo, et al. Application of Combined Acoustic-electric-chemical Detection to GIS Partial Discharge Defect Caused by Free Metal Particles[J]. High voltageapparatus, 2016, 52(9): 78-82+90. DOI: 10.13296/j.1001-1609.hva.2016.09.014.
Application of Combined Acoustic-electric-chemical Detection to GIS Partial Discharge Defect Caused by Free Metal Particles
Combined acoustic-electric-chemical detection of partial discharge(PD)
including ultrasonic
ultra-high frequency(UHF)
and SF
6
gas decomposition product detection techniques
was adopted to detect a GIS PD defect caused by free metal particles in the gas chamber of a current breaker. The judgement of metal particles in UHF monitoring and the advantage of ultrasonic detection in locating GIS PD defect were discussed. Subsequently
the source of the free metal particles was identified according to the characteristic gas detected from SF
6
gas decomposition products. Disassembly examination and mechanical switching test validated that mechanical abrasion of the arc contacts happened during their switching process
to produce the free metal particles in gas chamber of current breaker.