Transformer state evaluation method and system

Abstract

An embodiment of the invention discloses a transformer state evaluation method and system. State quantity indexes are normalized to obtain the health degree of the state quantity indexes, the subjective weight of each state quantity index is determined by an analytic hierarchy process in a fuzzy comprehensive evaluation theory, an objective weight corresponding to each state quantity is obtained by an entropy weight method and used for correcting the subjective weight to obtain comprehensive weight parameters of each state quantity index, the connection degree of each state quantity index and state classification is obtained by the aid of connection degree in a set pair analysis theory, and finally, data of evaluation results of a hierarchical index set of each unit are integrated by the aid of D-S evidence theory fusion rules to obtain state evaluation results of each sub-unit. Whether a transformer needs maintenance or not can be determined according to the state evaluation results, so that blindness of planned maintenance is avoided, and human and material resources needed by maintenance for the transformer are reduced.

Description

technical field [0001] The present invention relates to the technical field of power systems, and more specifically, to a transformer state monitoring method and system. Background technique [0002] The transformer plays an important role in the power system and is one of the most important and critical electrical equipment in the power system. The safety and reliability of its operation is directly related to the safety and stability of the power system. With the rapid development of the power grid, more and more single high-voltage, large-capacity transformers are put into power grid operation. At the same time, transformer failures caused by factors such as manufacturing, transportation, installation and maintenance quality seriously threaten the entire power grid. The safe operation of the system, so how to improve the reliability of transformer operation has always been an important topic in transformer operation testing. [0003] In order to make the transformer oper...

AI Technical Summary

Problems solved by technology

However, the traditional maintenance of transformers is a planned maintenance method, that is, the transformers are overhauled according to the scheduled maintenance cycle, and because the initial state of the transformer is good or bad, and the working conditions are different, some transformers do not need maintenance when they are due , and some transformers are not yet due, but they are likely to need maintenance, resulting in over-repair or under-repair of the transformer. Therefore, there is a lot of blindness in the planned maintenance method, resulting in waste of manpower and material resources

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