High-voltage cable insulation defect partial discharge on-line monitoring diagnosis method

Abstract

The invention discloses a high-voltage cable insulation defect partial discharge on-line monitoring diagnosis method, which involves analyzing obtained partial discharge data of various actual manufacturing typical defects from the perspectives of time domain waveform characteristics, spectrum distribution differences, separate spectrum analysis and the like, and establishing a discharge database and a comparison database of the various defects. By use of a high-voltage cable partial discharge detection system, through utilizing signal separating technologies including a three-phase amplitude relation atlas, a three-frequency range amplitude relation atlas and the like, pulse current waveform parameter characteristic value integrated information is analyzed, a discharge accumulation spectrum of on-site measuring data and a same-kind characteristic pulsed discharge cluster are formed, and finally a comparison is made between the discharge accumulation spectrum and the same-kind characteristic pulsed discharge cluster and the discharge database of the various defects so as to determine whether insulation defects exist for an on-site running cable line. The method can solve the problem of difficult on-line monitoring diagnosis of insulation defect partial discharge of a conventional cable device, and also can improve the accuracy and sensitivity of high-voltage cable insulation defect partial discharge detection diagnosis.

Description

technical field [0001] The invention relates to a detection method for cable equipment, in particular to an on-line monitoring and diagnosis method for partial discharge of a high-voltage cable insulation defect. 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 inspection 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] On-line monitoring of electric power equipment generally adopts portable testing equipment, which conducts on-site testing of equipment state quantities under running conditions. , suitable for the current my country's elec...

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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