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Fault diagnosis method for high voltage cable

A high-voltage cable and fault diagnosis technology, which is applied to fault locations, detects faults according to conductor types, and measures electricity. Effect

Inactive Publication Date: 2018-11-16
GUANGDONG POWER GRID CO LTD +1
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Problems solved by technology

During the operation of high-voltage cables, various faults such as insulation aging, grounding, and short circuit may occur, which will affect the reliable operation of the power system

Method used

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  • Fault diagnosis method for high voltage cable
  • Fault diagnosis method for high voltage cable
  • Fault diagnosis method for high voltage cable

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Experimental program
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Embodiment 1

[0037] like figure 1 Shown, a kind of method for fault diagnosis of high voltage cable, comprises the following steps:

[0038] S1: Use the principal component analysis method to obtain the characteristic information of the fault category of the high-voltage cable sample, construct a fault type feature dictionary, and jointly construct an extended dictionary based on the high-voltage cable original sample dictionary and the fault type feature dictionary;

[0039] S2: Based on the extended dictionary, the sparse representation method is used to calculate the approximation residual of various samples to the test sample;

[0040] S3: Determine the fault type; if the approximation residual error between the test sample and a certain fault type sample is the smallest, then the cable fault type is diagnosed as the fault type corresponding to this type of sample.

[0041] Specifically, the use of the principal component analysis method described in step S1 to construct the fault typ...

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Abstract

The invention relates to the field of fault diagnosis of high-voltage cables, in particular to a fault diagnosis method for a high-voltage cable. The method comprises the following steps: obtaining fault type characteristic information of a high-voltage cable sample by using a principal component analysis method, constructing a fault type characteristic dictionary, and jointly constructing an extended dictionary according to an original sample dictionary and the fault type characteristic dictionary of the high-voltage cable; calculating approximation residuals of all samples in the extended dictionary to the testing sample by utilizing a sparse representation method and judging fault types according to the approximation residuals. The invention provides the fault diagnosis method for analyzing cable fault information by using methods including dictionary expansion and sparse representation and the like, which can accurately judge the fault type of the high-voltage cable, greatly shorten the maintenance time and improve the power supply reliability of a power system.

Description

technical field [0001] The invention relates to the field of high-voltage cable fault diagnosis, in particular to a method for high-voltage cable fault diagnosis. Background technique [0002] With the acceleration of urbanization, high voltage cables are widely used. During the operation of high-voltage cables, various faults such as insulation aging, grounding, and short circuit may occur, which will affect the reliable operation of the power system. Therefore, in order to improve the reliability of power supply and maintain the safe and stable operation of the power system, a method that can accurately judge various faults is needed to help maintenance personnel perform accurate fault diagnosis and prescribe the right medicine to eliminate cable faults. This is beneficial to reduce maintenance workload and time, and improve power supply reliability. Contents of the invention [0003] Aiming at the above-mentioned technical defects, the present invention provides a met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/083G01R31/088Y04S10/52
Inventor 刘敏方义治孙廷玺何伟罗思琴曾志华黄培专王升雷小月曾繁源权少静吴美琳梁志成鲁晓一李鹏李建标檀佳王强钢王健周念成
Owner GUANGDONG POWER GRID CO LTD
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