Method of identifying high voltage cable inner insulation defect type based on specific chromatograms

Abstract

The invention relates to a method of identifying a high voltage cable inner insulation defect type, belonging to the electric power system power transmission equipment fault diagnosis technical field, and especially relates to a method of identifying a high voltage cable inner insulation defect type based on specific chromatograms. The method employs a signal phase spectrogram, a signal frequency response diagram and a signal pulse diagram to identify a high voltage cable inner insulation defect type based on specific chromatograms, and comprises the steps of: according to the time accumulation effect of the phase spectrogram, finding a phase related plotting graph with high repetition frequency, and performing preliminary discrimination on interference signals and insulation defect signals; selecting signal center frequency and bandwidth through an FFT graph, performing full spectrum band range scanning, meanwhile observing the plotting conditions of the phase spectrogram, and eliminating interference signals; and performing comparison identification on the pulse diagram and a special function atlas, and accurately performing insulation defect type identification. The method can rapidly identify a high voltage cable fault type without later calculation, and improve cable detection efficiency and accuracy.

Description

technical field [0001] The invention relates to a method for identifying the types of internal insulation defects of high-voltage cables, which belongs to the technical field of fault diagnosis of power system transmission equipment, and in particular to a method for identifying the types of internal insulation defects of high-voltage cables based on characteristic maps, specifically using signal phases based on characteristic maps Spectrogram, signal frequency response diagram, and signal pulse diagram three-graph method to identify the type of internal insulation defects of high-voltage cables. Background technique [0002] With the continuous development of the city, the construction scale of the power grid is also increasing. The major power supply companies need to transmit electric energy to every corner of the city through the power grid. Therefore, cables are important equipment in the power system, especially high-voltage power cables of 66kV and above. safe operati...

AI Technical Summary

Problems solved by technology

When testing high-voltage cables on site, high-voltage cables cannot suppress external disturbances by using shielding rooms and other means in the laboratory, and the interference signals generated by various electrical equipment connected to high-voltage cables will be transmitted through high-voltage cables, which cannot be used in laboratories. The equipment also ensures that the equipment itself has no interference and no partial discharge, which brings inconvenience to the identification of high-voltage cable insulation defect types. At the same time, there are many types of high-voltage cable defect types, and the traditional insulation defect types are judged by inspectors based on experience.

When insulation defects are found in high-voltage cables, the failure to identify the type of high-voltage cable defects brings inconvenience to the maintenance work of high-voltage cables

Images