On-line partial discharge monitoring system of ultrahigh-voltage cable

Abstract

The invention relates to an on-line partial discharge monitoring system of an ultrahigh-voltage cable, comprising an electromagnetic-coupling method on-line partial discharge detecting device, a capacitive-coupling method partial discharger and an on-line partial discharge detecting device, wherein the on-line partial discharge detecting device is connected with the electromagnetic-coupling method on-line partial discharge detecting device and connected with the capacitive-coupling method partial discharger. Compared with the prior art, the on-line partial discharge monitoring system has the advantages that the on-line partial discharge monitoring system establishes the fingerprint information of amplitude-frequency characteristics of partial discharge signals and the statistical change rule of signal characteristics and internationally takes the lead in researching the key characteristic quantity of the partial discharge signals. The on-line partial discharge monitoring system aims to realize the technical innovation of a mathematical algorithm on the basis of the characteristic analysis technique innovation of the partial discharge signals, thereby achieving the purpose of greatly breaking through a partial discharge signal identification technique and an on-line detecting and test technique.

Description

technical field [0001] The invention relates to a monitoring system for partial discharge of power cables, in particular to an online partial discharge monitoring system for ultra-high voltage cables. Background technique [0002] Throughout the development status of power cable online monitoring technology at home and abroad, the essential reasons why it cannot be popularized and applied are analyzed in detail: 1) There are many strong electromagnetic field interference sources at the cable operation site, which distorts the original waveform of the collected signal, which is easy to mislead and misjudge. Even missed judgment; 2) Lack of cable insulation partial discharge signal identification technology, lack of partial discharge pulse waveform, frequency and amplitude and external or cable internal interference pulse waveform, frequency and amplitude identification and judgment technology, and fingerprints corresponding to cable insulation defect types Identification and ...

AI Technical Summary

Problems solved by technology

[0002] Throughout the development status of power cable online monitoring technology at home and abroad, the essential reasons why it cannot be popularized and applied are analyzed in detail: 1) There are many strong electromagnetic field interference sources at the cable operation site, which distorts the original waveform of the collected signal, which is easy to mislead and misjudge. Even missed judgment; 2) Lack of cable insulation partial discharge signal identification technology, lack of partial discharge pulse waveform, frequency and amplitude and external or cable internal interference pulse waveform, frequency and amplitude identification and judgment technology, and fingerprints corresponding to cable insulation defect types Identification and judgment technology; 3) Lack of accumulation of actual operating experience such as the basis for evaluation of XLPE power cable insulation degradation and operating status criteria

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