When diagnosing internal partial discharge (PD) degradation phenomenon, one must be cautions about swarming pulsive microdischarges (SPMD). However, the details of the main factors in the appearance of SPMD are not clear yet. One of the reasons is that there has been no way to measure SPMD quantitatively. Therefore we have developed a computer aided partial discharge analysing system (CAPDAS) which can evaluate SPMD, and introduced a new PD parameter, the SPMD ratio, for quantitative analysis of SPMD. It became clear that the enhanced appearance of initial electrons in internal voids promotes the change of normal PDs into SPMD.
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