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XLPE cable partial discharge positioning method and system based on high frequency pulse current method

A high-frequency pulse current and cable partial discharge technology, which is applied in the detection of faults, fault locations, and faults according to conductor types by using pulse reflection method, can solve the problem of small discharge, and achieve loss avoidance, simple operation, and anti-interference strong effect

Active Publication Date: 2018-03-23
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Cables usually have a partial discharge development process before insulation breakdown. The initial partial discharge discharge is small and generally does not cause serious impact on the equipment, but it will develop into a penetrating discharge under the long-term action of high voltage.

Method used

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  • XLPE cable partial discharge positioning method and system based on high frequency pulse current method
  • XLPE cable partial discharge positioning method and system based on high frequency pulse current method
  • XLPE cable partial discharge positioning method and system based on high frequency pulse current method

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Embodiment Construction

[0044] It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0045]It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combinations thereof.

[0046] figure 1 It is a flow chart of a method for locating the partial discharge position of an XLPE cable base...

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Abstract

The invention discloses an XLPE cable partial discharge positioning method and system based on a high frequency pulse current method. The method comprises the steps that a current pulse signal generated by the partial discharge of a three-phase cable is collected; according to the phase time domain graph of each phase of the cable, the characteristic parameters of a partial discharge signal are extracted to judge the source cable phase sequence of the current pulse signal; the distance between a test point and an internal discharge point is calculated according to the time difference between an oscillating decay wave and a reflection wave in the phase time domain graph of the partial discharge signal collected on the determined partial discharge cable phase sequence; the orientation of thetest position and a discharge point is determined; the distance between the test position and the discharge point is determined according to the magnitude of the discharge signal amplitude in the phase time domain graph collected at different positions of the determined partial discharge cable phase sequence; and by adjusting the orientation of tested points and the discharge point and continuously reducing the distance between tested points, the discharge position is determined within a preset accuracy range. Accurate cable partial discharge positioning is realized.

Description

technical field [0001] The invention belongs to the field of high-voltage cable operation and maintenance, and in particular relates to a method and system for locating the partial discharge position of an XLPE cable based on a high-frequency pulse current method. Background technique [0002] In recent years, with the continuous development and transformation of urban power grids, the scale of transmission lines has increased day by day. Power cables are widely used due to their small footprint and environmental friendliness. Cross-linked polyethylene cables (XLPE cables) have become the mainstream products of power cables due to their excellent electrical properties and heat resistance, large transmission capacity, and convenient installation and laying. However, due to the complex structure of XLPE cables, and the on-site production and installation of joints (terminals and intermediate joints) are easily affected by the level of technology and environmental conditions, ...

Claims

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Application Information

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IPC IPC(8): G01R31/08G01R31/11
CPCG01R31/083G01R31/11
Inventor 张皓段玉兵姚金霞刘辉胡晓黎王斌林颖沈庆河刘嵘张洋周超贾然刘传斌马国庆王淼徐冉
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY
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