METHOD OF DETECTING PARTIAL DISCHARGING LOCATION OF POWER DEVICE

摘要

Provided is a method of accurately detecting the location of a partial discharge in a power device. For this purpose, the present invention measures sequential positions of arrival of partial discharge signals and the differences in the time of arrival between the partial discharge signals with respect to a plurality of partial discharge sensors installed on the outside surface of a power device, divides the power device into a plurality of spatial sections, determines a spatial section where the location of a partial discharge is present using the sequential positions of arrival of the partial discharge signals, calculates the representative location value of the determined spatial section, and determines compensation values for the differences in the time of arrival to be applied with respect to the respective spatial sections.

主权项

1. A method of detecting a location of a partial discharge in a power device using partial discharge signals that arrive at a plurality of partial discharge sensors installed on an outside surface of a power device, the method comprising:
dividing the power device into a plurality of spatial sections having an identical volume; measuring sequential positions of arrival of the partial discharge signals and differences in a time of arrival between the partial discharge signals with respect to the partial discharge sensors; determining one of the spatial sections to be a spatial section where the location of the partial discharge is present using the measured sequential positions of arrival of the partial discharge signals, and calculating a representative location value of the determined spatial section; setting up quaternary simultaneous equations regarding distances from the location of the partial discharge to the respective partial discharge sensors using the differences in the time of arrival between the partial discharge signals with respect to the respective partial discharge sensors, with coordinates (x,y,z) of the location of the partial discharge and a partial discharge signal arrival time (T1) for a first partial discharge sensor at which the partial discharge signal has arrived earliest being set as unknowns; and calculating the coordinates (x,y,z) of the location of the partial discharge from the quaternary simultaneous equations using a simultaneous equation numerical analysis algorithm, wherein the coordinates of the location of the partial discharge are calculated by applying the representative location value of the determined spatial section as an initial value of the simultaneous equation numerical analysis algorithm.