Multi-physics field coupling oil paper insulation partial discharge detection system based on UHF method

Abstract

The invention discloses a multi-physics field coupling oil paper insulation partial discharge detection system based on a UHF method. The multi-physics field coupling oil paper insulation partial discharge detection system is mainly composed of a multi-physics field coupling oil paper insulation partial discharge device, a UHF signal acquisition device, a data transmitting unit and a host displayunit, wherein the multi-physics field coupling oil paper insulation partial discharge device comprises a DC power supply, a harmonic power supply, a compound unit and an analog partial discharge device; output ends of the DC power supply and the harmonic power supply are connected with an input end of the compound unit; an output end of the compound unit is connected with an input end of the analog partial discharge device; the UHF signal acquisition device is in signal connection with the analog partial discharge device; and the data transmitting unit is used for effectively acquiring partialdischarge pulse signals, and transmits the partial discharge pulse signals to the host display unit in a wireless transmission mode. The multi-physics field coupling oil paper insulation partial discharge detection system realizes the simultaneous application of a DC voltage and a harmonic voltage, and can simulate the complicated working conditions of a valve side bushing of a converter transformer precisely.

Description

technical field [0001] The invention belongs to the technical field of oil-paper insulation discharge measurement, and relates to a multi-physics field coupling oil-paper insulation partial discharge detection system based on a UHF method. Background technique [0002] In recent years, accidents of converter transformers have occurred frequently. In 2007, the analysis report affecting the reliability indicators of my country's DC transmission system clearly stated that: 5 single-stage forced outages were caused by faults caused by converter transformers, and the outage time was 472.13 hours. , the single-stage planned outage was 4 times, and the outage time was 287.25 hours, causing the system to derate once. The insulation problem of the converter transformer is the main cause of failure. The insulation of converter transformers is mainly based on oil-paper insulation. Under the action of heat and electric stress, oil molecules will age and cardboard fibers will break, resu...

AI Technical Summary

Problems solved by technology

But at this stage, the research on the test and diagnosis technology of partial discharge under compound voltage is still in its infancy at home and abroad.

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