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For reliable verification of the quality of both, new and aged insulating systems, not only the correct measurement of significant internal partial discharges (PD) but also an exact localization and physical interpretation of the detected PD-signals is needed. A step forward towards the interpretation of conventionally measured PD-signals is realized by a digital data processing. This paper describes PD-measurements performed on different highvoltage apparatus using a computer controlled phase resolving partial discharge analyzer (PRPDA). The PRPDA-system records partial discharge (PD) activity of a test object during a given number of cycles of the applied ac voltage, or during a fixed time. Some typical results obtained in SFg-insulated systems (GIs), power transformers and power generators in off-line and in on-line condition are presented and discussed.

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