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A single-phase-to-earth fault starting method

A single-phase ground fault, algorithm technology, applied in fault location, fault detection by conductor type, short-circuit test, etc., can solve the problems of arc difficult to extinguish, increase of grid capacitance, influence of normal operation of power system, etc., to improve sensitivity , the effect of reducing noise, reducing computational burden and application difficulty

Active Publication Date: 2021-03-02
FUZHOU UNIV
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AI Technical Summary

Problems solved by technology

With the expansion of the scale of the power grid, especially the increase in the use of cables and the increase in line distance, the capacitance of the power grid to the ground increases. Once a ground fault occurs, the resulting arc is difficult to extinguish, which will seriously affect the normal operation of the power system. influences

Method used

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  • A single-phase-to-earth fault starting method
  • A single-phase-to-earth fault starting method
  • A single-phase-to-earth fault starting method

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Embodiment Construction

[0040] The technical solution of the present invention will be specifically described below in conjunction with the accompanying drawings.

[0041] This embodiment provides a single-phase-to-ground fault startup method in a distribution network, such as figure 1 shown, including the following steps:

[0042] Step S1: Perform Mallat wavelet packet decomposition on the zero-sequence voltage signal collected in real time to obtain specific frequency band components of the zero-sequence voltage signal, and on this basis, calculate the periodic variation of the selected high and low frequency components; this step specifically includes the following step:

[0043] According to the zero-sequence voltage data collected in real time, it is decomposed by Mallat wavelet packet. The recursive formula of Mallat algorithm is shown in formula (1) and formula (2):

[0044]

[0045] (p is an even number, j>0)

[0046]

[0047] (p is an odd number, j>0)

[0048] Among them, S j and ...

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Abstract

The invention relates to a novel single-phase ground fault starting method. It includes performing wavelet packet transformation on the bus zero-sequence voltage signal to obtain specific frequency band components, and further processing the historical data of high and low frequency components to obtain an adaptive threshold for diagnosing whether the system is disturbed. The continuous time realizes the rapid detection of single-phase ground fault. The invention can quickly and accurately identify single-phase ground faults. In addition, the invention can effectively distinguish single-phase ground faults from non-fault behaviors such as switching on-load lines and switching capacitor banks. It still has a high recognition accuracy under the condition of noise interference.

Description

technical field [0001] The invention relates to a method for starting a distribution network single-phase ground fault. Background technique [0002] The medium and low voltage distribution network usually refers to the power network with a voltage level of 35kV and below, which has a wide distribution range, a complex structure, and is closely connected with users. my country's 6-35kV distribution network generally adopts the low-current grounding method, and the occurrence rate of single-phase grounding faults is the highest under the low-current grounding method, accounting for more than 80% of distribution network faults. With the expansion of the scale of the power grid, especially the increase in the use of cables and the increase in line distance, the capacitance of the power grid to the ground increases. Once a ground fault occurs, the resulting arc is difficult to extinguish, which will seriously affect the normal operation of the power system. Influence. Therefor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08G01R31/52
CPCG01R31/086G01R31/088G01R31/50
Inventor 郭彩虹郭谋发李紫荆高伟
Owner FUZHOU UNIV
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