Tap switch fault detection system and method

Abstract

The invention relates to the technical field of tap switches, in particular to a tap switch fault detection system and method. The system comprises fluorescent fibers arranged on the inner side of a top cover of an oil tank and used for receiving optical signals in a tap switch, a photoelectric conversion module connected with the fluorescent fiber and used for converting an optical signal received by the fluorescent fiber into an electric signal, and a high-frequency oscilloscope connected with the photoelectric conversion module and used for displaying the electric signals converted by the photoelectric conversion module, wherein when the electric signal displayed by the high-frequency oscilloscope is larger than a set value, it is judged that a fault occurs in the tap switch. Optical signals generated by partial discharge are monitored in the mode that the fluorescent fibers are arranged on the inner side of the top cover of the oil tank of the sectional switch, complete electromagnetic interference immune performance is achieved, optical interference is avoided due to the characteristic of a totally-closed structure of the on-load tap-changer, and optical signals in the on-load tap-changer can be accurately detected.

Description

technical field [0001] The invention belongs to the technical field of tap changers, in particular to a tap changer fault detection system and method. Background technique [0002] The on-load tap changer refers to the voltage regulating device used to change the tap connection position of the transformer winding under the excitation or load of the transformer. Switching, thereby changing the number of turns of the winding, and finally realizing the purpose of voltage regulation; when there are insulation defects in the oil chamber of the on-load tap changer, and the vacuum tube deteriorates to a certain extent, pulse discharge phenomenon will occur, and there is an air gap or medium and low field in the insulation structure. There is a suspended metal body in the strong area, and when the vacuum degree of the vacuum tube is insufficient, the insulation strength between the closed contact and the shield is insufficient, which will cause partial discharge, resulting in pulse ...

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Problems solved by technology

[0003] In related technologies, the pulse current method or ultrasonic method is mostly used for the detection of partial discharge; however, if the pulse current method is used, it is necessary to connect the conductive rod of the vacuum tube to draw the high-frequency pulse current. Insulation and other performance requirements are high; the ultrasonic method is not easily disturbed by electric and magnetic signals, but the attenuation of the acoustic signal is relatively fast, and it is susceptible to interference from other mechanical vibrations and sound waves from sound sources

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