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Abstract

A method and an arrangement (300, 400) for determining the location of partial discharge sources in an electric system, the method includes 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 (301) one or more characteristic parameters depicting the properties of partial discharge pulses for each partial discharge pulse after at least a predefined number of partial discharge pulses has been obtained, and determining (302) the location of the partial discharge source by placing (302) the obtained characteristic parameters in a model formed in advance, which depicts the dependency of the values of the characteristic parameters from the distance between the partial discharge source and the measuring point where the characteristic parameters have been defined on the basis of the measured variables.

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