Partial discharge detection method and system based on infrared temperature measurement sensor

Abstract

The invention discloses a partial discharge detection method and device based on an infrared temperature measurement sensor. The method comprises the following steps: temperature measurement data of ahigh-voltage cable joint is obtained by using an infrared temperature measurement sensor; and a computer part judges whether a partial discharge phenomenon exists or not and judges the frequency andamplitude of partial discharge by identifying a time domain oscillogram generated by temperature measurement data in a sampling period and a frequency distribution state in a frequency domain spectrogram, and carries out trend analysis on the equivalent time width characteristic values and the center frequency characteristic values of the temperature measurement data in the plurality of sampling periods to judge the grade and the development trend of the partial discharge fault. According to the partial discharge detection equipment, distributed partial discharge online detection can be performed by using the method, and the sensor is small in size, simple and convenient to install, low in cost, long in service life and rapid in partial discharge diagnosis.

Description

technical field [0001] The invention relates to partial discharge detection technology, in particular to a partial discharge detection method and equipment based on an infrared temperature measuring sensor. Background technique [0002] On high-voltage power equipment, partial discharge failures in electrical contacts are relatively rare, but once a partial discharge failure occurs, it will be very harmful. In the late stage of partial discharge development, if the fault point is not found and eliminated in time, accidents such as burning or explosion may occur. There are many kinds of partial discharge detection equipment on the market, and the more mature ones are to detect high-frequency signals such as ultrasonic waves, ground waves, high-frequency pulse currents, ultra-high frequency or ultra-high frequency electromagnetic waves, etc. Most of them are made into portable devices, with fewer online devices and higher device costs. [0003] The hazards of partial dischar...

AI Technical Summary

Problems solved by technology

The partial discharge phenomenon has a periodic heating effect, which in turn leads to loosening of the cable head

[0005] (2) Partial discharge causes aging of fastening bolts

[0008] (2) Partial discharge faults are difficult to locate accurately

The usual partial discharge monitoring instrument detects outside the equipment shell, and it is difficult to determine the specific location where partial discharge occurs

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