Transformer reliability evaluation method based on integral health index

Abstract

The invention discloses a transformer reliability evaluation method based on an integral health index, and belongs to the technical field of transformer reliability evaluation. The method comprises the following steps that: feature quantities and feature factors of transformer states are selected, and an expression between the feature factors and the feature factors is determined; a weight of each feature factor is determined, the weights are multiplied by values of the corresponding feature factors, and a health index is obtained; a correction coefficient rule is used for correcting the obtained health index to obtain the corrected integral health index; the expected service life of a transformer is determined; the expected service life is used for calculating an aging coefficient of the transformer according to the integral health index value when the transformer is put into operation or quilts the operation; the aging coefficient is used for calculating a time-variation expression of the integral health index of the transformer; and the integral health index is used for obtaining a time-variation expression of the fault rate of the transformer, so that the fault rate is obtained. The method has the advantages that the internal conditions such as main insulation of the transformer and external conditions such as overhaul and operation of the transformer are sufficiently considered during the transformer reliability evaluation, and the transformer reliability can be more precisely and efficiently evaluated.

Description

technical field [0001] The invention belongs to the technical field of transformer reliability evaluation, and relates to a method for evaluating reliability of an oil-immersed transformer, in particular to a method for evaluating reliability of a transformer based on a comprehensive health index. Background technique [0002] With the rapid development of society and economy, the power system plays an increasingly important role in the national economy. With the improvement of voltage level and the increase of installed capacity, users have higher and higher requirements for power supply quality and reliability, which puts forward higher requirements for power equipment monitoring and diagnosis technology. [0003] Transformer is the core equipment for energy conversion in the power grid. In the process of power system's demand for large power grid and high voltage, transformer is one of the most critical equipment. The failure of transformers not only leads to direct main...

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Problems solved by technology

At the same time, considering the shortcomings of over-maintenance and untimely maintenance in the current regular maintenance method, quantitative calculation of the failure rate of transformers wit

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