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Single-phase grounding on-line fault locating method based on distribution automation main station

A single-phase ground fault and power distribution automation technology, applied in the direction of the fault location, can solve problems such as large errors and fault location errors, and facilitate maintenance and processing, increase accuracy and reliability, and improve adaptability and accuracy Effect

Active Publication Date: 2018-01-16
ZHUHAI XUJIZHI ELECTRIFIED WIRE NETING AUTOMATIONCO +1
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Problems solved by technology

However, due to the complex situation of on-site faults, due to the neutral point grounding method, line parameters and external interference, the fault characteristic quantities do not necessarily have clear boundaries, so it is easy to cause fault location errors or large errors.

Method used

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  • Single-phase grounding on-line fault locating method based on distribution automation main station
  • Single-phase grounding on-line fault locating method based on distribution automation main station
  • Single-phase grounding on-line fault locating method based on distribution automation main station

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Embodiment Construction

[0050] refer to figure 1 , a single-phase grounding online fault location method based on the distribution automation master station of the present invention, comprising the following steps:

[0051] A. When a single-phase ground fault occurs, the detection device or distribution automation terminal installed on the distribution line collects the characteristic information of the faulty line and sends it to the distribution automation master station;

[0052] B. Perform S-transformation on the collected characteristic information of the faulty line, that is, the fault recording, to obtain a time-frequency matrix, so as to fully display and analyze the details of fault characteristics;

[0053] C. For the characteristic information of the fault line, analyze its relative information entropy, transient energy phase angle correlation and transient energy amplitude correlation, and extract the fault characteristic quantity;

[0054] D. According to the fault feature quantity of the...

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Abstract

The invention discloses a single-phase grounding on-line fault locating method based on a distribution automation main station. The single-phase grounding on-line fault locating method based on a distribution automation main station includes the steps: extracting each fault characteristic quantity various signals when a single-phase earth fault occurs; utilizing a fuzzy clustering analysis methodto fuse each fault characteristic quantity; and fully applying the fault information, accurately positioning the fault position, thus not only improving accuracy and reliability of fault detection, and also improving adaptability and accuracy of fault determination.

Description

technical field [0001] The invention relates to the field of fault location of distribution network lines, in particular to a single-phase grounding online fault location method based on a distribution automation master station. Background technique [0002] my country's medium-voltage distribution network is dominated by the neutral point ungrounded mode, and the line faults of the distribution network are mainly divided into phase-to-phase short circuit and single-phase ground fault. For the phase-to-phase short circuit, due to the large short-circuit current and the obvious fault path, the fault section location technology is mature. For single-phase ground faults, due to the complex structure of the distribution network and the small fault current during single-phase ground faults, the problem of fault line selection has not yet been satisfactorily resolved, and it is more difficult to locate the fault section. Statistics show that single-phase ground faults account for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
Inventor 王兴念于雷秦卫东杨茂仔杨乔
Owner ZHUHAI XUJIZHI ELECTRIFIED WIRE NETING AUTOMATIONCO
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