Title :
Discrimination of partial discharge type in SF6 gas by simultaneous measurement of current waveform and light emission
Author :
Okubo, H. ; Yoshida, M. ; Suzuki, A. ; Kato, T. ; Hayakawa, N. ; Hikita, M.
Author_Institution :
Nagoya Univ., Japan
Abstract :
An attempt was made to give experimental evidence for partial discharge (PD) physical models where the discharge type changes from streamer to leader while PDs are taking place to breakdown in SF6 gas. The authors investigated the fundamental phase-resolved PD characteristics as well as the light emission characteristics of PD as a function of AC applied voltage and SF6 gas pressure. The results of the light emission revealed that two kinds of luminous types, sphere like and filamentary brightness PDs, appear depending on AC applied voltage and SF6 gas pressure. By introducing the simultaneous measuring technique of a single PD current pulse waveform and light emission at around the positive peak of the applied AC voltage, one can identify the two types of PD, streamer and leader
Keywords :
SF6 insulation; electric breakdown; gas insulated switchgear; insulation testing; partial discharges; switchgear testing; AC applied voltage; GIS; SF6; SF6 gaseous insulation; current waveform measurement; filamentary brightness PD; insulation breakdown tests; leader; light emission measurement; partial discharge type discrimination; phase-resolved PD characteristics; sphere like PD; streamer; Circuit testing; Current measurement; Geographic Information Systems; Image intensifiers; Needles; Partial discharge measurement; Partial discharges; Pulse measurements; Sulfur hexafluoride; Voltage;
Conference_Titel :
Electrical Insulation, 1996., Conference Record of the 1996 IEEE International Symposium on
Conference_Location :
Montreal, Que.
Print_ISBN :
0-7803-3531-7
DOI :
10.1109/ELINSL.1996.549294
