Partial discharge identification method for high-voltage switch cabinet

Abstract

The invention discloses a partial discharge identification method for a high-voltage switch cabinet, and belongs to the technical field of live detection of high-voltage equipment. Firstly, a switch cabinet voltage frequency measurement and phase measurement module (1) is connected with a square wave generation device (2); a transient ground voltage sensor (3) is fixed on the high-voltage switch cabinet, and a partial discharge measurement system (4) is connected with the transient ground voltage sensor (3); and a partial discharge signal of the high-voltage switch cabinet in operation is obtained. The partial discharge signal of the switch cabinet is collected by the transient ground voltage sensor in a superposed square wave form, whether the signal is a discharge signal or not is judgedaccording to the characteristics of the tested signal, and the position of partial discharge is analyzed. According to the invention, the problems of large interference signal and difficulty in correct identification in the existing partial discharge detection of the high-voltage switch cabinet are solved; and partial discharge possibly endangering insulation safety in the switch cabinet can be discovered, and the method has great significance in timely maintenance and discovery of weak insulation links.

Description

technical field [0001] The invention belongs to the technical field of live detection of high-voltage equipment, and in particular relates to a partial discharge identification method for a high-voltage switchgear. Background technique [0002] Switchgear is an extremely widely used switchgear. Due to various problems in design, manufacture, operation and maintenance, etc., the accident rate of switchgear is relatively high. In the distribution network, the switchgear operates in harsh environments such as high temperature, high pressure, and humidity for a long time, and its insulation is easily damaged, which will cause partial discharge. It is of great significance to monitor partial discharge of switchgear, diagnose insulation faults early and accurately, reduce equipment accident losses and unplanned outages, enhance operational capabilities, and improve equipment operation and maintenance management levels. [0003] When there is a partial discharge in the switchgear ...

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Problems solved by technology

[0003] When there is a partial discharge in the switchgear that may endanger the safety of the insulation, it is of great significance to take an appropriate method to determine the partial discharge in a timely manner and to find weak links in the insulation. At present, there is a lack of means to accurately judge the partial discharge. At present, in the partial discharge detection of the high-voltage switchgear , the interference signal is large, it is difficult to identify correctly, and the success rate of identifying discharge and interference is not high

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