We investigated the sequential generation characteristics of partial discharge (PD) pulses in SF 6 gas under the application of a positive dc voltage, in order to discuss the PD mechanism based on space charge behaviour and corona stabilization effect. Highly time-resolved measurement of PD current pulses enabled us to discuss the relationship between the PD charge q and the time interval Δ t of sequential PD pulses. Experimental results revealed that q -Δ t characteristics exhibited negative and positive correlation at small and large Δ t regions, respectively. Numerical calculations of ion diffusion and ion drift verified the time-dependent characteristics of the space charge behaviour and the resultant corona stabilization effect.
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Takahashi et al. (2001) studied this question.
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