Device and method for determining partial discharges at an electrical component

摘要

The present invention relates to a method for determining partial discharges at an electrical component (10). In the case of the method, an electrical signal that comprises partial discharge pulses due to the partial discharges at the electrical component (10) is detected. Through filtering of the electrical signal by means of n filters (18-20) having n differing filter characteristics, n filtered partial discharge signals are generated. Respectively one of the filtered partial discharge signals is assigned, respectively, to one of the n filters (18-20), n being greater than or equal to two. Finally, the partial discharges are determined by linking the n filtered partial discharge signals.

主权项

1. Method for determining partial discharges in an electrical insulation system of an electrical component, comprising the steps:
detecting an electrical signal that comprises partial discharge pulses due to dielectric breakdowns in the electrical insulation system of the electrical component, generating n filtered partial discharge signals by filtering the electrical signal by means of n filters having n differing filter characteristics, respectively one of the filtered partial discharge signals being assigned, respectively, to one of the n filters, n being greater than or equal to 2, and determining the partial discharges by linking the n filtered partial discharge signals, wherein an n-tuple is formed per partial discharge pulse, values of the n-tuple corresponding to the n filtered partial discharge signals of the partial discharge pulse, and the linking comprises a cluster analysis of the n-tuples, and wherein the electrical signal further comprises disturbance signals that are generated by a disturbance source inside or outside the electrical component and that are provided, as filtered partial discharge signals, by the n filters, the disturbance source is identified on the basis of at least one cluster of the cluster analysis, and only filtered partial discharge signals that were not generated by the disturbance source are used to determine the partial discharges of the electrical component.