The partial discharge measurement is a typical nondestructive test and it can be used to judge the insulation performance at the beginning of its service time taking into account the reduction of the performance during the service time by the ageing, whereby the ageing depends on numerous parameters like electrical stress, thermal stress and mechanical stress. Depending on the kind of insulating material, different limits for the allowed partial discharge value at a given stress are defined in the rele vant recommendations. In particular, for solid insulation where a com plete breakdown seriously damages the test object the partial discharge measurement is a tool for quality assessment.
Partial discharge measuring technique, Page 1 of 2
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