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Small current grounding system fault positioning method

A technology of small current grounding and system faults, which is applied in the direction of fault location and fault detection according to conductor type, can solve the problems of high error rate of fault judgment, achieve the effects of reducing daily maintenance costs, improving the accuracy of fault location, and improving labor efficiency

Inactive Publication Date: 2017-02-22
CHANGCHUN INST OF TECH +3
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Problems solved by technology

[0005] Aiming at the problems existing in the above-mentioned prior art, the present invention provides a small current grounding system fault location method, which solves the problem of high error rate of fault judgment in the prior art

Method used

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Embodiment

[0016] Step 1. When a single-phase ground fault occurs in the small current grounding system, record the zero-mode current of the previous period and the subsequent period of the single-phase ground fault;

[0017] Step 2. Decompose the transient zero-mode current fault component at the time of the single-phase-to-ground fault through empirical mode, and select the highest frequency eigenmode function component;

[0018] Step 3, according to the energy spectrum entropy value of the highest frequency eigenmode function component of each detection point, obtain the energy spectrum entropy factor value of the highest frequency eigenmode function component of each detection section; the definition of each detection point is, busbar The detection point at the exit is designated as detection point 1, the adjacent detection point is designated as detection point 2, and the numbers of the detection points are incremented sequentially, and the last detection point is designated as detec...

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Abstract

The invention relates to a small current grounding system fault positioning method which comprises the following steps: according to the energy spectrum entropy of the highest frequency intrinsic function component of each detection point, obtaining the energy spectrum entropy factor value of the highest frequency intrinsic mode function component of each detection section wherein each detection point is defined as follows: the detection point at the outlet of a bus as detection point 1, the adjacent detection point to detection point 1 as detection point 2, and the detection point number is sequentially added, and the last detection point is set as the detection point n; using the fuzzy C-means clustering method to perform clustering analysis on the sample set data formed by the energy spectrum entropy factors; and determining the class with the largest number of sections as the perfect class, that is, the perfect class; and determining the class with the smallest number of sections as the faulty class, that is, the faulty sections. The positioning method of the invention improves the accuracy and efficiency of the fault judgment, reduces the running operation cost and the daily maintenance cost, can help people understand the troubled condition in time, and quickly determines the fault location so as to enable them to carry out data inquiry and get involved in the troubleshooting work.

Description

technical field [0001] The invention relates to a small current fault location method, in particular to a small current grounding system fault location method, which belongs to the field of electric power applications. Background technique [0002] In my country's power transmission and distribution system, the small current grounding system with the neutral point ungrounded or grounded through the arc suppression coil is mainly used. [0003] When the transmission line of the small current grounding system fails, it is very difficult to judge the fault due to the complex fault parameters. At present, the accuracy rate of single-phase grounding fault judgment can only reach 60%-70%. In addition, single-phase grounding permanent faults are generally caused by short-term and instantaneous grounding faults, so there is a certain degree of fault point location method using conventional high-voltage transmission lines and using the steady-state fault component of single-phase gro...

Claims

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Application Information

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IPC IPC(8): G01R31/08
CPCG01R31/086
Inventor 张广新张海明张杨于温方韩长海刘冰陈洪涛颜萌
Owner CHANGCHUN INST OF TECH
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