Fault line selection method and device for small-current grounding system

A small current grounding and system fault technology, applied in the direction of the fault location, can solve the problems of low accuracy of line selection results and difficulty in adapting to the requirements of fault conditions, so as to improve the accuracy of line selection, reliability and accuracy, The effect of meeting the requirements of fault conditions

Inactive Publication Date: 2016-03-30
CHINA AGRI UNIV
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Problems solved by technology

[0005] Aiming at the defects existing in the prior art, the present invention proposes a faulty line selection method and device for a small current grounding system to solve the problems in the prior art that the accuracy of the line selection results is low, and it is difficult to apply to faulty work of various complex power grid structures. Conditional Questions

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  • Fault line selection method and device for small-current grounding system
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  • Fault line selection method and device for small-current grounding system

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[0068] The following will clearly and completely describe the technical solutions in the embodiments of the present disclosure with reference to the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments in the present disclosure, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present disclosure.

[0069] Such as figure 1 As shown, an embodiment of the present disclosure provides a fault line selection method for a small current grounding system, the method includes the following steps S1 to S7:

[0070] S1. Collect the transient zero-sequence current of each line in the small current grounding system from the moment of fault according to the preset sampling frequency;

[0071] Take the sampling frequency of 100kHz as an example: accor...

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Abstract

The invention provides a fault line selection method and device for a small-current grounding system, and the method comprises the steps: respectively collecting transient zero sequence currents of all lines in the small-current grounding system from a fault moment according to a preset sampling frequency; calculating the optimal atoms of all lines according to the transient zero sequence currents of all lines; calculating the atom singular entropies of all lines according to the optimal atoms of all lines; calculating the atom actual energy of all lines according to the atom singular entropies of all lines; calculating the fault confidence degrees of all lines based on a pre-constructed fault confidence degree function according to the atom singular entropies of all lines; correcting the fault confidence degrees of all lines according to the atom actual energy of all lines, and obtaining the fault integrated measurement values of all lines; comparing the fault integrated measurement values of all lines, and carrying out fault line selection. The method improves the reliability and accuracy of fault line selection, and can meet the requirements of fault conditions of various types of complex power grid structures.

Description

technical field [0001] The invention relates to the technical field of power system fault line selection, and specifically designs a small current grounding system fault line selection method and device. Background technique [0002] my country's distribution network mainly adopts the neutral point non-effective grounding system, that is, the small current grounding system, and the small current grounding fault is also called one-way grounding fault, which is the most important fault form of the distribution network. The requirements are getting higher and higher. Scholars have done a lot of research on the line selection of small current ground faults, because when a one-way ground fault occurs, the transient signal features are very rich, so the analysis method based on the transient signal has been widely concerned. , Commonly used transient signal fault analysis methods include: transient energy method, Prony algorithm, correlation analysis method, wavelet decomposition me...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
Inventor 温渤婴魏向向苗立俐郭志强
Owner CHINA AGRI UNIV
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