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Power distribution network single-phase ground fault identification method based on multi-source information

A single-phase ground fault, multi-source information technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of single-phase ground fault identification difficulties, and achieve the effect of avoiding missed selection

Active Publication Date: 2019-12-13
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a single-phase-to-ground fault identification method of distribution network based on multi-source information, which is used to solve factors such as load, switching of compensation capacitor banks, and different phase actions of switches in distribution network. The problem of difficult identification of single-phase ground fault caused by

Method used

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  • Power distribution network single-phase ground fault identification method based on multi-source information
  • Power distribution network single-phase ground fault identification method based on multi-source information
  • Power distribution network single-phase ground fault identification method based on multi-source information

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Effect test

Embodiment 1

[0074] Example 1: Such as figure 2 As shown, the fault nature judgment model is built in the simulation software, and the 10kV distribution network goes out from the 10kV bus side of the 110kV / 10kV substation, and the line L 1 Connect electric arc furnace load, line L 4 , L 6 Overhead line, line L 3 , L 5 It is a cable line; the neutral point passes through the Z-shaped transformer T z Connect arc suppression coil L, arc suppression coil L and small resistance R n Connect to the earth after parallel connection, and r L Is the damping resistance of the arc suppression coil.

[0075] Assuming that the distribution network has four states of 800Ω single-phase grounding fault, small load removal, motor removal, and capacitor bank input in different periods, the sudden energy of the zero sequence voltage and the switching state are used to identify whether the distribution network is faulty. "1" means the switch is off, and "0" means the switch is closed.

[0076] image 3 It is a singl...

Embodiment 2

[0077] Example 2: Assume figure 2 After the small load was removed in 0.45s, a single-phase grounding fault occurred in 0.462s in the distribution network. Multi-source fault identification was performed by combining the zero sequence voltage energy mutation energy and switching information and the zero sequence current power spectrum.

[0078] The sudden change energy of the zero sequence voltage exceeds the threshold, and the switch information volume changes from closed to open; if only the sudden change of the zero sequence voltage and the state change of the switch are used, the fault may be missed, combined with the zero sequence current power If the main frequency is close to the main frequency of the zero sequence current of 48.8281 Hz when the distribution network fails, it is determined that there is a fault in the distribution network.

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Abstract

The invention relates to a power distribution network single-phase ground fault identification method based on multi-source information and belongs to the technical field of power system relay protection. Firstly suddenly changed energy of a zero sequence voltage is taken as functional starting of single-phase ground fault identification; then whether a single-phase ground fault occurs is judged by combining the suddenly changed energy of the zero sequence voltage and on-off state information changing situation; and finally maximum entropy estimation power spectrum is adopted for further distinguishing an on-off action and the single-phase ground fault. The method provided by the invention adds maximum entropy estimation zero sequence current power spectrum identification on the basis of identifying the fault by adopting the suddenly changed energy of the zero sequence voltage as well as on-off state inforamtion, thus the power distribution network single-phase ground fault identification method based on the multi-source inforamtion is formed, and miss-selection of the single-phase ground fault can be effectively avoided.

Description

Technical field [0001] The invention relates to a method for identifying a single-phase ground fault of a distribution network based on multi-source information, and belongs to the technical field of power system relay protection. Background technique [0002] The topological structure of the distribution network is complex, the operation mode is changeable, and there are many lines. At present, most of the information source used in the detection of single-phase ground faults in the distribution network is a single source, either only using electrical quantities or only using switches. The fault boundary of the distribution network is complicated. Simple one-dimensional information is difficult to determine whether the distribution network is truly faulty. Only by monitoring with multi-dimensional information can the accuracy of the judgment result be guaranteed. This is a fault in the distribution network. Detection brings difficulties. The sudden change of the zero sequence v...

Claims

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Application Information

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IPC IPC(8): G01R31/02
Inventor 束洪春李钰玺董俊李一凡史宗翰张书诚林少鹏
Owner KUNMING UNIV OF SCI & TECH
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