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Early fault warning method for high-voltage cable

A high-voltage cable and fault early warning technology, which is applied to the fault location, detects faults according to conductor types, and measures electricity. It can solve the problems of lack of effective criteria for cable faults and achieve accurate early warning effects.

Inactive Publication Date: 2018-11-20
GUANGDONG POWER GRID CO LTD +1
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Problems solved by technology

However, most of these methods lack effective criteria for cable faults, and can only analyze part of the fault types.

Method used

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  • Early fault warning method for high-voltage cable
  • Early fault warning method for high-voltage cable
  • Early fault warning method for high-voltage cable

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Experimental program
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Embodiment 1

[0052] Such as figure 1 As shown, a method for early warning of faults on high-voltage cables includes the following steps:

[0053] S1: Use the neighborhood-preserving embedding-principal component analysis manifold learning algorithm for parameter calculation;

[0054] S2: T of normal samples 2The control limit of statistics and average error prediction statistics is used as the threshold criterion of high-voltage cable fault early warning, and the corresponding high-voltage cable fault early warning strategy is formulated;

[0055] S3: The control limit of the normal sample and the T of the data to be tested 2 Statistics are compared, if the T of the data to be tested 2 If the statistic exceeds the control limit of normal samples, it can be considered that the high-voltage cable is faulty, otherwise it is in a normal state.

[0056] Specifically, the neighborhood-preserving embedding-principal component analysis manifold learning algorithm described in step S1 includes ...

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Abstract

The invention relates to an early fault warning method for a high-voltage cable, and belongs to the field of early fault warning of high voltage cables. The method comprises that a neighborhood preserving embedding method is combined with a principal component analysis method, and a structural characteristic of cable fault data is obtained; a T2 statistic quantity and an average error prediction statistic quantity are selected as characteristic quantities of early fault warning; control limits of the T2 statistic quantity and average error prediction statistic quantity of a normal sample serveas threshold criteria of early fault warning of the high-voltage cable, and a main abnormity index is determined according to contribution of characteristic indexes; and the control limit of the normal sample is compared with the T2 statistic quantity of data to be measured, and if the T2 statistic quantity of the data to be measured exceeds the control limit, it is considered that a fault occursin the high-voltage cable, and otherwise, the cable is normal. According to the method, characteristic can be extracted from the cable fault data effectively, the anti-interference performance is high, different faults can be distinguished, and a fault of the high-voltage cable can be predicted accurately.

Description

technical field [0001] The invention relates to the field of high-voltage cable fault early warning, in particular to a method for high-voltage cable fault early warning. Background technique [0002] With the acceleration of urbanization, high voltage cables are widely used. During the operation of high-voltage cables, failures such as insulation aging may occur, which will affect the reliable operation of the power system. Therefore, in order to reduce the failure rate of high-voltage cables and maintain the safety and stability of the power system, it is necessary to study accurate and reliable high-voltage cable fault early warning technology. Existing cable fault early warning methods are mainly based on online monitoring technology, such as DC component method, DC superposition method, online tan method, partial discharge method, sheath current analysis method, etc. However, most of these methods lack effective criteria for cable faults, and can only analyze part of ...

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强钢王健周念成
Owner GUANGDONG POWER GRID CO LTD
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