Annular power distribution network single-phase earth fault line selection method based on classification identification

A single-phase grounding fault, classification identification technology, applied in the direction of detecting faults, fault locations, and measuring electricity according to conductor types, can solve the problems of many types of faults, small fault components, affecting the accuracy of ground fault line selection, etc. Widespread, improved safety and reliability effects

Pending Publication Date: 2021-06-08
JIANGSU ELECTRIC POWER CO
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Problems solved by technology

When a single-phase ground fault occurs in the distribution network, the fault characteristics are more complex, there are many ty

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  • Annular power distribution network single-phase earth fault line selection method based on classification identification
  • Annular power distribution network single-phase earth fault line selection method based on classification identification
  • Annular power distribution network single-phase earth fault line selection method based on classification identification

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[0040] The technical solutions of the present invention will be described in detail below with reference to the accompanying drawings.

[0041] The present invention proposes a method of changing a ring-shaped distribution method based on classification identification, such as figure 1 As shown, the specific steps are as follows.

[0042] Step 1: Determine the structure according to the ring distribution network, determine each line is a loop or a feeder, and perform an overall number; each number has a uniqueness; specifies the positive and negative direction of the zero sequence current, that is, the bus is flowed to the line, by the line The flowing bus is negative;

[0043] Step 2: By detecting the size of the zero sequence voltage to determine whether a single-phase fault is generated, if it starts a fault line.

[0044] That is: 0 ≥u 0zd When it is judged that a single phase failure occurs. Where u 0 Valid value for zero sequence voltage monitored by the substation; U 0zd Fo...

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Abstract

The invention discloses an annular power distribution network single-phase earth fault line selection method based on classification identification. Firstly, whether a power distribution network has a single-phase earth fault or not is judged by detecting the zero-sequence voltage of an annular power distribution network; and when a single-phase earth fault occurs, the type of the single-phase earth fault is distinguished by judging the characteristics of the zero-sequence voltage and the zero-sequence current. For an arc grounding fault, a neutral point grounding mode does not need to be distinguished, and fault criteria of a loop line and a feeder line are directly calculated; for a steady-state grounding fault, different fault criterion calculation methods are adopted according to different neutral point grounding modes of the power distribution network; and whether the fault is located on the loop line or the feeder line is distinguished according to the characteristics of the loop line fault criterion, and finally the line where the fault is located is determined according to the maximum value of the fault criterion. Any type of single-phase grounding fault line selection of the annular power distribution network under different grounding modes of the neutral point is realized, and the operation safety and reliability of the annular power distribution network are effectively improved.

Description

technical field [0001] The invention relates to the technical field of power system automation, in particular to a method for line selection of single-phase grounding faults in a ring distribution network based on classification and identification. Background technique [0002] Single-phase ground fault line selection in distribution network has always been a difficult point in relay protection. When a single-phase-to-ground fault occurs in the distribution network, the fault characteristics are complex, there are many types of faults, and the fault components are relatively small, which seriously affects the accuracy of ground fault line selection. For this reason, a large number of power workers have also proposed some line selection methods based on the characteristics of zero-sequence components after a ground fault. These line selection methods mainly include: the line selection method based on the zero-sequence current quantity composed of the characteristics of the z...

Claims

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Application Information

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IPC IPC(8): G01R31/08G01R31/52G01R31/58
CPCG01R31/086G01R31/088G01R31/52G01R31/58
Inventor 侯永全陈士军吴波邓天王艳唐润恒刘苏云张森周沫
Owner JIANGSU ELECTRIC POWER CO
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