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Cao Zhengqin,Gang Wei,Zhou Yongjian,Bai Yichun,Hu Ding-Wen 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.2
Aiming at the serious defects of wire-type free metal particles, which can cause severe partial discharge (PD) in Direct current (DC) gas-insulated equipment, the experiments on the infl uence of four lengths (3.0, 5.0, 7.0, and 9.0 mm) of wiretype free metal materials on SF 6 decomposition under DC PD were conducted. The formation rules of four characteristic decomposition components, namely, CF 4 , SOF 2 , SO 2 F 2 and SO 2 , under diff erent lengths of wire-type free metal particles, were determined using gas chromatography. Results showed that the amounts of four kinds of SF 6 DC PD characteristic decomposition components are proportional to the length of wire-type free metal particles. The long length of wire-type free metal particles increases the intensity of PD and the amount and eff ective generation rates of SF 6 DC PD characteristic decomposition components. All these fi ndings provide an experimental basis for the diagnosis of insulation defect types in SF 6 DC gas insulated equipment.