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

A single-phase ground fault, classification and identification technology, applied in the direction of fault detection, fault location, and electrical measurement according to conductor type, can solve the problems of multiple types of faults, small fault components, and complex fault characteristics, so as to improve safety and reliability Sexuality, a wide range of effects

Pending Publication Date: 2021-03-09
国网江苏省电力有限公司沛县供电分公司 +1
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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 types of faults, and the fault components are relatively small, which seriously affects the accuracy of ground fault line selection.

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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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Embodiment Construction

[0023] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0024] The present invention proposes a single-phase-to-earth fault line selection method for ring-shaped distribution networks based on classification and identification, such as figure 1 As shown, the specific steps are as follows.

[0025] Step 1: According to the structure of the ring distribution network, determine whether each line is a ring line or a feeder line, and carry out overall numbering; each number is unique; specify the positive and negative directions of the zero-sequence current, that is, the flow from the bus to the line is positive, and the flow from the line is positive. The flow to the bus is negative;

[0026] Step 2: Determine whether a single-phase ground fault occurs by detecting the magnitude of the zero-sequence voltage, and if so, start fault line selection.

[0027] That is: when U 0 ≥U 0zd , it is judged that a single-phase...

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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 asingle-phase earth fault or not is judged by detecting the zero-sequence voltage of the 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, directly calculating fault criteria of a loop line anda feeder line without distinguishing neutral point grounding modes; for steady-state grounding faults, different fault criterion calculation methods are adopted according to different neutral point grounding modes of the power distribution network; it is distinguishes whether the fault is located on the loop line or the feeder line 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. According to the invention, any type of single-phase earth fault line selection of the annular power distribution network under different neutral point grounding modes is realized, and the operation safety and reliability of the annular power distribution network are effectively improved.

Description

technical field [0001] The invention belongs to the technical field of electric power system automation, and in particular relates to a single-phase grounding fault line selection method of 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 characteris...

Claims

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Application Information

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IPC IPC(8): G01R31/08G01R31/52
CPCG01R31/086G01R31/088G01R31/52
Inventor 侯永全陈士军吴波邓天王艳唐润恒刘苏云张森周沫
Owner 国网江苏省电力有限公司沛县供电分公司
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