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Power frequency dependence of space charge behavior and partial discharge characteristics in SF6 gas

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4 Author(s)
Takahashi, T. ; Dept. of Electr. Eng., Nagoya Univ., Japan ; Yamada, T. ; Hayakawa, N. ; Okubo, H.

The partial discharge (PD) and breakdown (BD) characteristics in SF6 gas under commercial and higher frequency (∼600 Hz) ac voltage applications were investigated using high-speed electrical and optical measuring techniques with phase gate control method. Experimental results revealed that 400 Hz BD voltage at a certain gas pressure range was higher than that for 60 Hz and PD characteristics especially at the positive PD inception phase were much influenced by the applied power frequency. From these results, we clarified the dependence of space charge behavior on the applied power frequency and discussed the physical mechanism of PD and BD in SF6 gas with consideration of the space charge behavior generated by PD in the previous half cycle of ac voltage.

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Dielectrics and Electrical Insulation, IEEE Transactions on  (Volume:7 ,  Issue: 1 )