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Low current fusion line selection method based on extension theory

A line selection method and a small current technology, applied in the direction of measuring electricity, measuring electrical variables, and detecting faults by increasing the damage degree of the fault point, which can solve the problem of ignoring the thorough analysis of fault characteristics.

Inactive Publication Date: 2020-01-14
SHANGHAI HONGYAN MACHINERY TECH
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Problems solved by technology

However, if you rely too much on mathematical analysis tools and ignore the thorough analysis of the fault characteristics itself, the solution to the problem is tantamount to sacrificing the basics and chasing the last

Method used

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  • Low current fusion line selection method based on extension theory
  • Low current fusion line selection method based on extension theory
  • Low current fusion line selection method based on extension theory

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Embodiment Construction

[0057] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0058] See Figure 1-2 , The present invention provides the following technical solution: a method for low current fusion line selection based on extension theory, including the following steps:

[0059] A. Obtain the attenuated DC component of each feeder line;

[0060] B. Obtain the comprehensive correlation coefficient of wavelet packet decomposition;

[0061] C. Determine the three elements of single-phase ground fault;

[0062] D. Establ...

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Abstract

The invention discloses a low current fusion line selection method based on an extension theory. The low current fusion line selection method fuses inductive attenuation direct current component characteristics of each feeder fault zero sequence current and transient component wavelet packet decomposition comprehensive correlation coefficients of a characteristic frequency band by employing the extension theory, fully utilizes obvious fault transient characteristics when a single-phase grounding fault occurs in a cable-wire hybrid line, set a quantity domain corresponding to each characteristic adaptively according to each characteristic value, determines a weight coefficient corresponding to each characteristic objectively according to the size of a single-phase grounding fault angle, andfurther improves the accuracy of the line selection method.

Description

Technical field [0001] The invention relates to the technical field of small current fusion line selection, in particular to a small current fusion line selection method based on extension theory. Background technique [0002] Existing line selection techniques only use part of the useful information of the fault, so they have certain limitations and cannot be applicable to all fault situations. In the past three years, the research on line selection for small current grounding faults has risen again. Scholars at home and abroad have introduced wavelet analysis, Prony method, ANN method, information fusion, and fuzzy methods into small current grounding protection. However, if you rely too much on mathematical analysis tools and ignore the thorough analysis of the fault characteristics itself, solving the problem is tantamount to ruining the last. Summary of the invention [0003] The purpose of the present invention is to provide a low-current fusion line selection method based ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08G01R31/10
CPCG01R31/081G01R31/088G01R31/10
Inventor 李桂英
Owner SHANGHAI HONGYAN MACHINERY TECH
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