Title :
Impulse partial discharge and breakdown mechanism under non-uniform electric field in N2/SF6 gas mixtures
Author :
Yoshitake, Y. ; Hayakawa, N. ; Ueda, T. ; Okubo, H.
Author_Institution :
Okubo Lab., Nagoya Univ., Japan
Abstract :
Partial discharge inception voltage (PDIV50) with 50% probability and breakdown voltage (BDV50) were measured in N2/SF6 gas mixtures under non-uniform electric field for positive lightning impulse voltage application. In order to investigate partial discharge (PD) and breakdown (BD) mechanisms, PD step length and time interval of PD pulses were discussed through the simultaneous measurement of current, light intensity waveforms, streak and still light emission images of the impulse PD. Experimental results revealed the stepwise propagation of the impulse PD and the relationship between the time interval of consecutive PD pulses and the step propagation length.
Keywords :
SF6 insulation; electric fields; gas insulated switchgear; gas mixtures; nitrogen; partial discharge measurement; GIS; N2; N2-SF6; N2/SF6 gas mixtures; PD inception voltage; PD mechanisms; PD pulse time interval; PD step length; SF6; breakdown mechanisms; breakdown voltage; gas-insulated switchgear; light intensity waveforms; nonuniform electric field; partial discharge inception voltage; positive lightning impulse voltage application; step propagation length; stepwise propagation; still light emission images; streak emission images; Breakdown voltage; Current measurement; Electric breakdown; Electric variables measurement; Lightning; Nonuniform electric fields; Optical propagation; Partial discharge measurement; Partial discharges; Pulse measurements;
Conference_Titel :
Electrical Insulation and Dielectric Phenomena, 2002 Annual Report Conference on
Print_ISBN :
0-7803-7502-5
DOI :
10.1109/CEIDP.2002.1048915
