High voltage switch cabinet partial discharge analysis method

Abstract

The invention discloses a high voltage switch cabinet partial discharge analysis method. The high voltage switch cabinet partial discharge analysis method comprises that: partial discharge information is obtained; a low frequency signal is filtered; a data quantity which is sampled in a cycle is read by a microprocessor; the microprocessor performs FFT transformation on the data; the microprocessor draws a waveform graph and a frequency spectrum graph; low frequency signal filtering is performed after partial discharge information is obtained; the microprocessor reads a data quantity sampled in a cycle; an FFT transformation is performed on the data by the microprocessor; and the waveform graph and the frequency spectrum graph are drawn by the microprocessor. The invention is a switch device partial discharge signal mode identification method based on S transformation and a DBN network and can accurately analyze partial discharge information and discharge capacity online in real time.

Description

technical field [0001] The invention belongs to the technical field of high-voltage power distribution, and in particular relates to a partial discharge analysis method of a high-voltage switch cabinet. Background technique [0002] In recent years, the application of switchgear in the power system has become more and more extensive. The number of electrical accidents caused by the insufficiency of the field test method of the switchgear and the deterioration of the insulation characteristics of the switchgear put into operation has been increasing year by year, which seriously threatens the safe operation of the power system and ultimately affects the power supply. Quality and power supply reliability; According to statistics, among the factors that cause the deterioration of the insulation characteristics of switchgear, the deterioration caused by partial discharge accounts for 85%. The issues that the regulatory authorities are increasingly concerned about and urgently ne...

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Problems solved by technology

[0004] At present, the traditional switchgear TEV, ultrasonic, and UHF partial discharge detection methods are all outside the cabinet, which are generally susceptible to external sound and electrical interference, and the detection results are not directly related to the severity of the discharge. In addition, a large amount of manpower is required to carry out Periodic patrol inspection finds whether there is partial discharge in the switchgear. The present invention provides a partial discharge analysis method for high-voltage switchgear. This method is based on the S-transformation and DBN network switchgear partial discharge signal pattern recognition method, which can be accurately detected online in real time. Analyze partial discharge information

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