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Single-phase earth fault locating method of power distribution network

A single-phase ground fault and distribution network fault technology, applied in the field of positioning, can solve the problems of poor accuracy, high cost, unsuitable for distribution system promotion, etc., and achieve the effect of simple positioning method and rapid judgment

Inactive Publication Date: 2014-03-05
STATE GRID CORP OF CHINA +3
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Problems solved by technology

[0023] Among the above methods, some are only suitable for use in substations, some are used on the line, the accuracy is poor, or the cost is too high, and some are only suitable for use in special systems, not suitable for promotion in power distribution systems

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  • Single-phase earth fault locating method of power distribution network

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Embodiment Construction

[0032] With reference to the drawings in the description, a method for locating a single-phase grounding fault in a power distribution network of the present invention includes the following steps:

[0033] Step 1. Install a distribution network fault indicator on each node and each branch line of the distribution network, and the distribution network fault indicator detects the current information on the corresponding node in real time;

[0034] Step 2. Compare the measured transient current directions of the three-phase nodes of the same line, and if the three-phase transient current directions are different, determine that the three-phase node is a faulty node;

[0035] Step 3. Determine the faulty line. If the three-phase nodes in the current inflow direction of a line are faulty nodes, and the three-phase nodes in the current outflow direction are all non-faulty nodes, the line is a faulty line.

[0036] The following is a detailed description:

[0037] combine figure 1...

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Abstract

The invention discloses a single-phase earth fault locating method of a power distribution network. The method comprises the following steps that (1) power distribution network fault indicators are mounted on all nodes and branches of the power distribution network, and three power distribution network fault indicators which are located on the same circuit and different in phase are used for comparing three-phase transient current information in real time to judge if faults happen; (2) fault information of all circuits is sent to a monitoring center to judge fault places. The method is simple and can be used for quickly judging fault positions.

Description

technical field [0001] The invention relates to a positioning method, in particular to a single-phase grounding fault positioning method of a distribution network. Background technique [0002] At present, most of the medium-voltage distribution networks of 6kV-35kV in my country adopt the neutral point ungrounded method or the neutral point grounding method through the arc suppression coil, which is called the neutral point non-effective grounding method, or the small current grounding system. After the single-phase grounding fault occurs in the distribution network, the problem of fault location has not been well solved for a long time, which affects the reliability and economy of power supply. Commonly used single-phase-to-ground fault detection methods are as follows: [0003] 1) On-line measurement method of high-order harmonic zero-sequence components [0004] It is mainly used for fault line selection in substations, online detection of the direction of the zero-seq...

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Application Information

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IPC IPC(8): G01R31/08
CPCY04S10/522Y04S10/52
Inventor 朱立位衡思坤韦海荣何玲周光宇尹雷李德众
Owner STATE GRID CORP OF CHINA
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