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Abstract

A method and an arrangement (300, 400) for separating partial discharge pulses originating from various partial discharge sources in an electric system, comprises the steps of measuring a variable of the electric system, such as voltage or current, to which partial discharges occurring in the electric system cause pulses, separating the pulses caused by partial discharges, i.e. partial discharge pulses, and occurring in the measured variable, defining and storing pulse parameters depicting the partial discharge pulses, or information from which the pulse parameters can be derived, defining (301) one or more characteristic parameters depicting the properties of partial discharge pulses for each partial discharge pulse by means of the pulse parameters after at least a predefined number of partial discharge pulses has been obtained, and separating (302) on the basis of one or more values of characteristic parameters the partial discharge pulses originating from different partial discharge sources into pulse groups. In addition, the number of the partial discharge sources can be defined (305) on the basis of the number of the pulse groups.

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