Improved fuzzy comprehensive evaluation-based cable operation state evaluation method

Abstract

The invention discloses an improved fuzzy comprehensive evaluation-based cable operation state evaluation method, which comprises the following steps of: obtaining a cable joint partial discharge evaluation characteristic quantity, and performing standardization processing; calculating a weight value of each evaluation characteristic quantity by adopting a comprehensive weighting method; dividingevaluation grades in combination with multiple operation states of the cable joint, and determining a membership function of each grade according to the divided evaluation grades; substituting the standardized values of the evaluation characteristic quantities of the cable joints of different switch cabinets of the same transformer substation into the membership function of each level, so as to obtain a fuzzy relation matrix of each cable joint; and carrying out weighted average operation on the weight value of each evaluation characteristic quantity by utilizing the obtained fuzzy relation matrix, and determining an evaluation grade corresponding to the operation state of the cable joint according to a maximum membership degree principle. According to the method provided by the invention,each evaluation characteristic quantity of partial discharge is comprehensively weighted by adopting an improved comprehensive weighting method, so that the insulation health state of the cable jointcan be timely and accurately evaluated.

Description

technical field [0001] The invention relates to the technical field of cable joint insulation operation state monitoring, in particular to a cable operation state evaluation method for improved fuzzy comprehensive evaluation. Background technique [0002] The power system plays a significant role in the national economy. With the comprehensive and in-depth development of the smart grid construction, the requirements for the safe operation and intelligence of high-voltage electrical equipment are also getting higher and higher. The cable joint in the high-voltage switchgear is the terminal of the cable line, which plays the role of connecting the cable line and the switchgear and other equipment; because of its complex structure and manufacturing process, the cable joint is also the location where partial discharges occur frequently. [0003] With the rapid development of computer technology and sensing technology, the online monitoring technology of power equipment has been ...

AI Technical Summary

Problems solved by technology

Existing technology often judges the health status of equipment through a scoring mechanism. This kind of assessor directly assigns a score based on his past experience, and the decision-making result is highly subjective and arbitrary, which is easy to cause misjudgment

However, the fuzzy comprehensive evaluation method based on the fuzzy characteristics of data needs to comprehensively consider subjective and objective factors for comprehensive weighting in terms of weight amplitude, so as to avoid the disadvantage of poor objectivity of the subjective weighting method and make up for the objective weighting method based entirely on the data. The disadvantage that the determined weight is inconsistent with people's subjective wishes due to the relationship between

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