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Power distribution network line single-phase earth fault positioning system

A single-phase grounding fault, locating system technology, applied in fault location, electrical measurement, short-circuit testing, etc., can solve the problem of the lack of low-current grounding fault locating function in the distribution automation system, achieve reliable and stable operation analysis, and improve comprehensive diagnosis Efficiency and the effect of improving the overall quality level

Pending Publication Date: 2022-07-05
STATE GRID ANHUI ELECTRIC POWER CO LTD ANQING POWER SUPPLY CO
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Problems solved by technology

[0010] The invention provides a single-phase ground fault location system for distribution network lines, which solves the problem that the distribution automation system lacks a small current ground fault location function

Method used

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  • Power distribution network line single-phase earth fault positioning system
  • Power distribution network line single-phase earth fault positioning system
  • Power distribution network line single-phase earth fault positioning system

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no. 2 example

[0060] Please refer to image 3 , Figure 4 , Figure 5 and Image 6 , A grid-based distribution network line single-phase grounding fault location system is characterized in that it includes a classification module, a fault identification module, a segment location module, an information recording module and a self-check matching module.

[0061] The classification module is used for classifying the zero sequence current waveform of the existing fault line.

[0062] The fault identification module includes a storage module, an acquisition module, a comprehensive analysis module, a normalization processing module and a classification determination module.

[0063] The saving module is used to save the transient signal waveform, the acquisition module obtains the saved transient signal waveform, the comprehensive analysis module uses a variety of analysis methods to obtain different characteristics of the obtained transient signal waveform, and the normalized The processing...

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Abstract

The invention provides a power distribution network line single-phase earth fault positioning system. The method comprises the following steps: S1, fault classification; s2, judging based on transient information; and S3, fault section positioning: analyzing a large amount of field data, and dividing a fault line into five fault types, namely a stable fault, an arc fault, a high-resistance arc fault, a high-resistance discharge fault and a gap discharge fault, by using a distinguishing method for a zero-sequence current waveform of the fault line. The power distribution network line single-phase grounding fault positioning system provided by the invention performs on-line detection and positioning on power distribution network system faults through single-phase grounding line fault detection of a power distribution network, has a low-current grounding fault positioning function, timely eliminates a fault scheme, strengthens mastering of power distribution line fault identification, and improves the fault positioning accuracy. The comprehensive diagnosis efficiency of the distribution line is continuously improved through an effective and reasonable operation diagnosis method, the comprehensive quality level is improved, and reliable and stable operation analysis of a safe power grid is achieved.

Description

technical field [0001] The invention relates to the field of power grid operation, in particular to a single-phase grounding fault location system for power distribution network lines. Background technique [0002] The research on line fault detection and identification methods has a long history in the field of transmission lines, while in distribution lines, the research on fault identification has been neglected. Considering the importance of distribution lines, it has been carried out one after another. The fault detection and classification of distribution lines mainly include the following methods: time domain analysis, frequency domain analysis, wavelet transform, Hilbert-Huang transform, Kalman filter, signal injection, various signal analysis theories and intelligent algorithms combined methods, etc. [0003] Among them: 1. Install a fault indicator on the cable line according to the principle that the fault current amplitude is greater than the normal current ampl...

Claims

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Application Information

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IPC IPC(8): G01R31/08G01R31/52G01R31/58
CPCG01R31/085G01R31/088G01R31/52G01R31/58
Inventor 张闻勤王亚金伟安
Owner STATE GRID ANHUI ELECTRIC POWER CO LTD ANQING POWER SUPPLY CO