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Grey target theory-based sulfur hexafluoride circuit breaker state assessment method

A technology of circuit breaker status and sulfur hexafluoride, applied in the field of electric power, can solve the problems of large maintenance volume, high cost, easy over-repair or under-repair, etc., to ensure correctness, reasonable calculation results, and ensure operation stability. and power supply reliability

Inactive Publication Date: 2015-10-28
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In a huge power system, if the circuit breaker is overhauled according to regular maintenance or blackout preventive test, it will cause a large amount of overhaul, high cost, and prone to over- or under-repair and other shortcomings. It is important to accurately assess

Method used

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  • Grey target theory-based sulfur hexafluoride circuit breaker state assessment method
  • Grey target theory-based sulfur hexafluoride circuit breaker state assessment method
  • Grey target theory-based sulfur hexafluoride circuit breaker state assessment method

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Experimental program
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Effect test

Embodiment 1

[0065] Before the high-voltage circuit breaker fails, according to different status level standards, corresponding preventive measures can be adopted to solve the over-repair or under-repair problems caused by regular maintenance. There should not be too many or too few status classifications. Generally, it is more appropriate to choose 4-5 classifications. According to the minimum information principle in the gray system theory, the target degree should be uniformly graded.

[0066] 0.3333 ≤ ξ 1 + ξ ≤ γ ( x 0 , x j ) ≤ 1

[0067] In this embodiment, according to the relevant theorem of the gray relational degree, each classification with a bull's-eye degree below 0.3333 has no practical significance...

Embodiment 2

[0100] This embodiment analyzes and calculates based on the measured data of the SF6 high voltage circuit breaker model LW-126 in a 110kV substation, the sequence to be evaluated

[0101] ω' 2 ={0.25,1.42,1.35,60.35,36.92,3.65,2.84,100,100,10000,30.90,0.58,80,65}

[0102] This embodiment also uses the calculation method of Embodiment 1 for calculation. After calculation, the bullseye degree is 0.6691, which is judged to be level I and in normal operation state. Combined with the on-site operation situation, the evaluation result and the actual SF 6 The high voltage circuit breaker operates in the same manner.

[0103] The evaluation method based on the improved weighted gray target theory provided by the present invention has more reasonable calculation results, overcomes the shortcomings of the single subjective and objective weighting method, ensures the correctness of the evaluation results, and provides new ideas for obtaining index weight values .

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Abstract

The invention provides a grey target theory-based sulfur hexafluoride circuit breaker state assessment method, which comprises the following steps of b, acquiring an approaching degree by virtue of grey target transformation; c, performing state grading on the state of a circuit breaker; d, determining a state grade of the circuit breaker according to a numerical value of the approaching degree. According to the grey target theory-based sulfur hexafluoride circuit breaker state assessment method, an improved weight grey target theory is adopted for assessing the state of the circuit breaker, and a least deviation weighting method is adopted for determining a weight of a state index of the circuit breaker, so that a calculation result is more reasonable, the shortcomings of single subjective and objective weighting methods are overcome, the accuracy of an assessment result is ensured, an overhauling strategy is more reasonable and targeted, and the running stability and the power supply reliability of a power system are ensured.

Description

technical field [0001] The invention relates to the field of electric power, in particular to a method for evaluating the state of a sulfur hexafluoride circuit breaker based on the gray target theory. Background technique [0002] The high-voltage circuit breaker is an important switching device in the power grid. It can cut off or close the no-load current and load current in the high-voltage circuit, and when the system fails, it can cut off the overload current and short-circuit current through the function of the relay protection device. Arc extinguishing structure and sufficient breaking capacity. In the power system, the high-voltage circuit breaker is responsible for the functions of control and protection, and its operating status directly affects the operation stability and power supply reliability of the power system. There are many high-voltage circuit breakers in the power system, and their types can be divided into: oil circuit breakers (more oil circuit breake...

Claims

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Application Information

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IPC IPC(8): G06F19/00
Inventor 滕黎吴爽谢兵伍福平杨高峰王微波刘海龙刘璐
Owner STATE GRID CORP OF CHINA
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