Transformer failure rate evaluation method based on historical fault data of distribution network

Abstract

The invention provides a transformer failure rate evaluation method based on historical fault data of a distribution network, the transformer is a 110 / 10kV oil-immersed transformer, and the steps include: a transformer body failure rate evaluation method, and a transformer failure rate evaluation method caused by lightning strikes , Transformer failure rate evaluation method caused by short circuit and moisture, transformer failure rate evaluation method caused by user factors, and overall transformer failure rate evaluation. The invention can guide electric power workers to quickly and accurately evaluate the probability of transformer failure, identify transformers with a relatively high failure rate, and remind electric power workers that they should repair the transformers with high failure rate, which is conducive to realizing the safe and stable operation of the transformer. The reliability of the user's electricity consumption has promotion prospects and practical significance.

Description

technical field [0001] The present application relates to the technical field of distribution network protection, and in particular, to a transformer failure rate evaluation method based on distribution network historical fault data. Background technique [0002] Transformer is one of the key equipment in the power system, among which oil-immersed transformer occupies 75% of the distribution network, and the transformer undertakes the tasks of voltage conversion, power distribution and transmission, and provides power services for users. With the development of my country's distribution network, users' demand for capacity continues to increase, and users' requirements for power supply reliability continue to increase. The transformer failure in operation not only requires the transformer itself to be outaged and repaired, but may also cause large-scale power outages in the power grid. Due to the complexity of the transformer structure and failure mechanism, the transformer o...

AI Technical Summary

Problems solved by technology

There are many factors that lead to the failure of oil-immersed transformers. Among them, oil-immersed transformers use mineral oil as the medium for insulation and heat dissipation, and use insulating cardboard for insulation. The main reason for the aging failure of oil-immersed transformers is the loss of mechanical strength of insulating cardboard. That is, the main body failure of oil-immersed transformers is mainly concentrated in the calculation of the life of the insulating cardboard; before reaching the service period, its failure probability changes with the historical operating conditions and external factors. From the outside, the overhead line is caused by induction lightning. Lightning overvoltage is generated, causing lightning waves to invade the transformer along the line, resulting in overvoltage of the transformer; some factors are random and uncontrollable, user factors, external short circuit, and damp will affect the transformer, resulting in transformer failure

At present, there is a lack of consideration of the impact of all influencing factors on the transformer, and the actual failure rate of the transformer considering all factors cannot be calculated, and effective maintenance references cannot be provided.

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