群小部分放電現象の解析を目的とした部分放電計測システムの開発と新部分放電パラメータの提案

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  • Development of Partial Discharge Measurement System for Analysis of Swarming Pulsive Microdischarges and Proposal of New Partial Discharge Parameter
  • グンショウ ブブン ホウデン ゲンショウ ノ カイセキ オ モクテキ ト シタ

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When partial discharge (PD) was measured with the conventional pulse method, it sometimes apparently disappeared. However, it turned out that, in many cases the PD did not actually disappear, but only became a large number of very small partial discharges known as swarming pulsive microdischarges (SPMD). After this silent stage, PD appeared again, leading to final breakdown. Since SPMD are missed in the conventional PD detection, it is necessary to pay careful attention to SPMD in terms of insulation diagnosis. The authors developed a personal-computeraided partial discharge analyzing system for SPMD measurement. The system has two detection methods for partial discharge measurement: a conventional pulse charge method and a balanced Lissajous figure method. The former failed to detect SPMD due to the sensitivity limit of the detector, while the latter integrated all charges including SPMD per half cycle. Therefore, the difference between the charge integrals of partial discharges per half cycle measured -by these two methods must be a good measure of SPMD. Based on this idea, a new parameter, the SPMD ratio, was introduced. Using the developed system and the new parameter, partial discharge characteristics were studied for the CIGRE method-II specimen with internal void, in order to examine the factors affecting the appearance of SPMD. From the experiments, it became clear that there are two kind of factors to induce SPMD with or without the relation to the partial discharge degradation.

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