Detection method and device for partial discharge of mobile transformer

Abstract

The invention discloses a detection method and a device for partial discharge of a mobile transformer, comprising a detection host. The detection host is connected with a high frequency current sensor, a ultrasonic sensor and an ultrahigh frequency sensor. The ultrahigh frequency sensor is arranged at an oil discharge valve of the transformer to detect partial discharge of the transformer, detection frequency band of the ultrahigh frequency sensor is 500 MHz-1500 MHz; the ultrasonic sensor is arranged on surface of a shell of the transformer through adhesive to detect partial discharge of thetransformer, the detection frequency band of the ultrasonic sensor is 20 KHz-100 KHz; a core or clip lead of the transformer passes through center of the high frequency current sensor, according to Faraday's law of electromagnetic induction, varying electric fields generate varying magnetic fields, so that the high frequency current sensor can acquire local discharge signals. According to the detection method and the device for the partial discharge of the mobile transformer, detection technology such as ultrahigh frequency, ultrasonic wave, high frequency current and the like are adopted, thedevice can movably detect on site, detection efficiency of the partial discharge of mobile transformer is obviously improved.

Description

Technical field: [0001] The invention relates to a transformer discharge point detection technology, in particular to a mobile transformer partial discharge detection method and device. Background technique: [0002] Power transformers are mainly oil / paper insulation structures, and their insulation has been operating under high voltage and strong electric field environments for a long time, which is very sensitive to partial discharge. Partial discharge is closely related to the deterioration and breakdown of insulating materials. Partial discharge is not only the cause of insulation deterioration, but also the precursor and manifestation of insulation deterioration. Field experience shows that insulation fault is one of the important reasons affecting the reliable operation of power transformers, and insulation faults often originate from the deterioration and defects of the internal insulation of power transformers caused by partial discharge. [0003] Studies at home an...

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Problems solved by technology

[0004] Problems existing on site at present: 1. There are many on-site testing instruments, and it is impossible to integrate the detection methods of UHF, ultrasonic, high-frequency current, etc., and it is easy to miss bands, less bands, and a lot of time is spent on instrument sorting and loading and unloading. low efficiency

2. The on-site detection environment is complex, the power source for on-site maintenance is too far away, and when there are multiple detection points, the detection efficiency is low

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