Power transformer running state evaluation method and power transformer running state evaluation device

Abstract

The invention discloses a method and device for evaluating the operating state of a power transformer, belonging to the field of transformers, comprising: step 1: selecting an evaluation index for the operating state of the transformer, and constructing an evaluation model for the operating state of the transformer; step 2: dividing the operating state level of the transformer, and formulating the corresponding The scale interval of each operating state level; Step 3: Based on the analysis of the segmented triangular fuzzy number coupling set pair analysis, obtain the state deterioration connection degree of each evaluation index in the index layer; Step 4: Combined with expert experience, comprehensively apply fuzzy analytic hierarchy process and Similarity cluster analysis, assigning subjective constant weights to each evaluation index; Step 5: Determine the objective variable weights of each evaluation index based on the improved CRITIC weighting method, and combine the objective variable weights with the corresponding subjective constant weights; Step 6: According to the corresponding subjective and objective variable weights of the evaluation indicators, obtain the relationship degree of state deterioration between the project layer and the transformer as a whole. The invention can reasonably and accurately judge the running state of the transformer.

Description

technical field [0001] The invention relates to the field of transformers, in particular to a method and device for evaluating the operating state of a power transformer. Background technique [0002] At present, the equipment maintenance management mode of electric power enterprises has fully transitioned from the "one-size-fits-all" traditional maintenance to condition-based maintenance, in order to alleviate the phenomenon of "treating minor diseases and treating them without disease" in the process of equipment operation and maintenance management, and reducing unnecessary investment and financial loss. The power transformer is the most important pivotal equipment in the power system, and its healthy operation status is the basic guarantee for realizing the safe, reliable and economical operation of the network. [0003] The evaluation of the operating status of power transformers is the basis for realizing its condition-based maintenance mode. At present, transformer ...

AI Technical Summary

Problems solved by technology

At present, transformer state evaluation methods based on fuzzy theory, artificial neural network, Bayesian network, etc. have been proposed one after another, but there are the following shortcomings: the simple and rough index evaluation function (fuzzy membership function) makes the evaluation process extremely subjective Arbitrary; it is difficult to obtain effective network training samples; the huge amount of computation makes the evaluation process too complicated and cumbersome

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