Abstract
It is well known that the phase distribution of partial discharge in GIS depends on the source of discharge. However, the equivalent circuit model has not been considered sufficiently. On the other hand, the authors have proposed an extended Whitehead circuit model, and have explained the difference of the phase distribution of discharge. In this paper the case of needle on spacer is treated in a model GIS (300kV), and the difference of phase distribution is measured. Next the dust figures are obtained, and charged regions on the spacer are discussed. Finally, it is stated that the EMTP simulation by the extended Whitehead circuit model agrees with the result of experiments fairly well.
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