Power cable partial discharge detection system based on the combination of UHF and HFCT

Abstract

The invention relates to partial discharge detection of three-phase power cable insulation in a metal sheath crossing interconnection mode, and provides a power cable partial discharge detection system based on ultrahigh-frequency and high-frequency current combination for diagnosing and recognizing the insulation partial discharge defect of the power cable. Therefore, the technical scheme adoptedby the invention is that the power cable partial discharge detection system based on the combination of UHF and HFCT comprises an ultra-high frequency signal acquisition unit, and a data acquisitionand transmission unit, which are sequentially in series connection; a high-frequency signal acquisition unit, a data acquisition and transmission unit, which are sequentially in series connection; a host computer and a wireless synchronization module. The method is mainly applied to partial discharge detection of phase power cable insulation.

Description

technical field [0001] The present invention relates to a partial discharge detection for the insulation of three-phase power cables in the form of metal sheath cross-connection, in particular to a double-terminal partial discharge fault detection based on the double CT method, specifically, to a method based on the combination of UHF and HFCT Power cable partial discharge detection system. Background technique [0002] XLPE cables (Cross-linked Polyethylene, XLPE) are an important part of the city's power supply and main grid. Since they are laid by direct burial, pipes, trenches and tunnels, the laying environment and use status will greatly affect The life of the cable, after being put into use, is not only affected by the action of the electric field, mechanical action, and heat, but also by environmental factors. Under the combined action of these factors, the cable insulation is prone to aging, resulting in partial discharge, which is the cause of power grid accidents....

AI Technical Summary

Problems solved by technology

The traditional off-line detection method increases the operating cost and power outage time of power equipment, and even increases the failure rate of equipment, and there is still a probability of failure between maintenance intervals, which has been unable to meet the actual needs of power production and people's lives.

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