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Improved evidence theory-based breaker fault diagnosis method

A technology of circuit breaker failure and evidence theory, applied in the direction of instruments, character and pattern recognition, computer parts, etc., can solve the problem of increasing unreliability of results, and achieve the effect of accurate fault type

Active Publication Date: 2017-11-21
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

Specifically, the classic D-S evidence theory (Dempster-Shafer Theory) gets a problem that is contrary to the intuitive result when synthesizing highly conflicting evidence, which makes the result of fault diagnosis more unreliable.

Method used

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  • Improved evidence theory-based breaker fault diagnosis method

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Embodiment Construction

[0042] The technical solutions of the present invention will be further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0043]Aiming at the defect of the D-S evidence theory, which is contrary to the intuitive result when synthesizing highly conflicting evidence, the present invention proposes a method for synthesizing conflicting evidence based on support probability.

[0044] The definition of this method is a mechanism for judging the support rate of the proposition by the evidence group. It is considered that the basic reliability of the evidence group in a proposition is higher than 1 / m to support the proposition, where m is the number of propositions in the identification framework, The support rate of the evidence group for the proposition is the percentage of the number of evidence groups supporting the proposition to the total number of evidence groups.

[0045] Let the identification frame Ω={A 1 ,A 2 ,...,A m}...

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Abstract

The invention discloses an improved evidence theory-based breaker fault diagnosis method. According to the method, an evidence group is firstly defined, a mathematic model method is utilized to correct evidence credibility functions, and extremely low credibility values are distributed for propositions, the basic credibility of which is 0, in evidences, so that the 0 credibility paradox problem in the traditional D-S synthesis rule is solved without influencing the support degrees, for each proposition, of the evidences; and support probability is taken as a weight to solve conflict problems in the evidences, so that the effective fusion of conflicted evidences is realized.

Description

technical field [0001] The invention relates to a fault diagnosis method of a circuit breaker, in particular to a fault diagnosis method of a circuit breaker based on improved evidence theory. Background technique [0002] The circuit breaker is a crucial control and protection device in the power system, and it is also the most frequently operated device in the power grid. According to the traditional planned maintenance method, because the maintenance personnel cannot timely understand the actual operating state of the circuit breaker operating mechanism, the blindness of the operation is strong, and it is easy to cause excessive or insufficient maintenance. In addition, the overhaul of the circuit breaker requires disassembly, which has high time and economic costs. Simultaneous disassembly and reassembly may cause new defects and reduce the reliability of the circuit breaker operation. Because those skilled in the art have developed an online monitoring method, which is...

Claims

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Application Information

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IPC IPC(8): G06K9/62
CPCG06F18/2411G06F18/214
Inventor 牛为华赵鹏
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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