High-voltage cable insulation defect partial discharge electrification detection diagnostic method

Abstract

The invention relates to a high-voltage cable insulation defect partial discharge electrification detection diagnostic method. The electrification detection diagnostic method comprises the following steps: a. establishing a partial discharge integrated fingerprint database for the cable insulation defect, wherein the partial discharge integrated fingerprint database comprises a plurality of partial discharge mode classifications; b. performing three-phase synchronous acquisition based on a high-frequency electromagnetic coupling method and storing a cable discharge pulse signal between 0.1Hz and 20MHz, analyzing the characteristic value of current waveform of the cable discharge pulse signal through signal separation so as to obtain the required discharge accumulation map and similar characteristic pulse discharge cluster; and c. contrasting the obtained discharge accumulation map and similar characteristic pulse discharge cluster with the partial discharge modes in the integrated fingerprint database, and outputting the corresponding high-voltage cable insulation defect result. According to the method, the operation is convenient, the application range is wide, safety and reliability are realized, and the effectiveness and the efficiency of the diagnosis and comparison are improved.

Description

technical field [0001] The invention relates to a method for detecting and diagnosing, in particular to a method for detecting and diagnosing partial discharge and electrification of insulation defects of high-voltage cables, which belongs to the technical field of cable equipment detection. Background technique [0002] With the rapid expansion of the grid scale and the rapid growth of electricity demand, society has higher and higher requirements for the reliability of grid power supply. As an important content of condition-based maintenance, the comprehensive and in-depth application of live detection technology for power equipment can detect potential hidden dangers in the operation of power equipment in time and avoid sudden failures, which is an important guarantee for the safe and stable operation of power equipment. [0003] The live detection of power equipment generally adopts portable detection equipment, and the on-site detection of the equipment state quantity i...

AI Technical Summary

Problems solved by technology

However, during the manufacture and operation of electrical equipment, various factors will lead to the formation of insulation defects. Under long-term operating voltage, partial discharges caused by various defects often exist at the same time, and the measured partial discharge signals are mostly these discharges. The sum of signals whose identification and classification are quite complex

[0007] The existence of the above factors greatly reduces the accuracy and sensitivity of partial discharge detection and diagnosis of high-voltage cable insulation defects, which may easily lead to misjudgment and misjudgment

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