Patent ID: 9581632
Date: 2017-02-28
CPC Classifications: G01R

Claim:
1. Monitoring apparatus for remote monitoring of partial discharge events in electrical apparatus, the monitoring apparatus comprising: one or more sensors for detecting, at a position remote from the electrical apparatus being monitored, partial discharge pulses in one or more conductors conveying electrical power to the electrical apparatus being monitored and means for discriminating arranged to analyse pulse shape and to discriminate between the detected pulses according to their pulse shapes in order to determine whether each of the detected partial discharge pulses originated from the electrical apparatus being monitored or from other causes, wherein the monitoring apparatus further comprises one or more additional partial discharge sensors arranged to detect only those partial discharge pulses that do not originate from the electrical apparatus being monitored, and wherein the means for discriminating is arranged to compare the output of the or each said sensor with that of the or each said additional sensor, and thereby to determine whether pulses detected in the one or more conductors originated from the electrical apparatus being monitored or from other causes.