On-line fault early-warning method of XLPE power cable

A cross-linked polyethylene and power cable technology, applied in the direction of the fault location, etc., to facilitate early or planned maintenance, improve power supply reliability, and reduce economic losses.

Inactive Publication Date: 2014-02-12
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] In summary, for cross-linked polyethylene (XLPE) power cables, the existing online detection methods have their own limitations

Method used

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  • On-line fault early-warning method of XLPE power cable
  • On-line fault early-warning method of XLPE power cable
  • On-line fault early-warning method of XLPE power cable

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Experimental program
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Effect test

Embodiment Construction

[0023] The invention detects and records on-line in real time when a "recoverable fault" occurs in a certain cross-linked polyethylene (XLPE) power cable, the flow of grounding conductors such as the metal shielding layer or steel armor of the power cable under test is generated. Transient electromagnetic transient signal, using specific criteria or manual analysis methods, to carry out fault warning on the power cable under test, including the following specific steps:

[0024] Step 1: Pass the ground conductor such as the metal shielding layer or steel armor of the XLPE power cable under test through a hole-type high-frequency current sensor, and the output of the high-frequency current sensor is connected to a high-speed signal acquisition and data processing system; the high-speed signal acquisition and processing system includes at least one high-speed signal acquisition unit and a data analysis and processing system with specific criteria;

[0025]Step 2: Use the high-fr...

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PUM

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Abstract

The invention discloses an on-line fault early-warning method of an XLPE power cable. An instant electromagnetic transient signal flowing through grounding conductors such as a metal shielding layer and a steel armour of the detected power cable is detected and recorded in a real-time and on-line mode, wherein the instant electromagnetic transient signal is generated when the detected XLPE power cable breaks down in a restorable mode; faults of the detected power cable are early warned through special criteria or a manual analysis method. By means of the on-line fault early-warning method of the XLPE power cable, one or more power cables can be detected on line, on-line detection devices are not forcibly required to be installed on all power cables connected to the same bus of a transformer substation, and therefore the system configuration is flexible, safe and reliable.

Description

technical field [0001] The invention belongs to the field of on-line monitoring of power equipment. The monitored power cables are cross-linked polyethylene (XLPE) power cables of various voltage levels running in a small current system, and can provide online early warning of grounding faults of the power cables. Background technique [0002] Cables used for power transmission and distribution are called power cables. With the progress of society and the development of industrial and agricultural production, the proportion of cables used in the entire power transmission line is increasing. Compared with overhead lines, cables have the following main advantages: high reliability of power transmission, not easily affected by surrounding environment and The impact of pollution; the insulation distance between the lines is small, the land occupation is small, and there is no interference with radio waves; when laying underground, it does not occupy the ground and space, which i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
Inventor 贾延海杨玉平鲍杰魏敏汪国智
Owner STATE GRID CORP OF CHINA
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