Power transformer comprehensive state evaluation method based on evidence cloud matter-element model

Abstract

The invention discloses a power transformer comprehensive state evaluation method based on an evidence cloud matter-element model, and the method comprises the steps: determining the evaluation index and state grade division of a transformer, and constructing an evaluation index system; constructing a state evaluation basic framework by using the cloud matter-element model, calculating all level cloud feature parameters of each index, and establishing a level normal cloud model; acquiring test data of each index of the transformer, and calculating the correlation degree between each index in a test item and the level normal cloud model; determining the comprehensive weight of the index by using a subjective and objective combination weight method, and calculating the comprehensive correlation degree between the test item and each level of normal cloud model; fusing the comprehensive correlation degrees of the test items to obtain the overall grade correlation degree of the transformer; and calculating an asymmetric close degree and performing decision judgment to obtain a final evaluation result. The method is applied to the technical field of power transformer state evaluation, the accuracy of power transformer state evaluation can be improved, and the applicability can be further expanded.

Description

technical field [0001] The invention relates to the technical field of state evaluation of electrical equipment, in particular to a method for comprehensive state evaluation of a power transformer based on an asymmetric closeness degree and an evidence cloud matter-element model. Background technique [0002] The condition assessment of power transformers can not only provide the operation and maintenance staff with the judgment basis for equipment condition maintenance, but also play a key step in the maintenance of equipment and the safe and stable operation of the entire power system. Because the actual operating state of the transformer is affected by various factors such as the operating environment, climate, and internal factors, there are problems such as the randomness of the state change factors and the ambiguity of the state level boundary in the evaluation process, so the state evaluation of the transformer is a complex task. an uncertain process. [0003] At pre...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a comprehensive state assessment method for power transformers based on the evidence cloud matter-element model to solve the problem that the comprehensive state assessment of power transformers in the prior art is either limited to only considering a single uncertainty, or Limited to decision-making and judgment methods, or limited to a single method of empowerment; its applicability is insufficient, etc.

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