Fault diagnosis method and system for transformer

Abstract

The invention provides a fault diagnosis method and system for a transformer. The method comprises the steps of selecting a transformer fault case comprising dissolved characteristic gas in the transformer oil, building a fault case library of transformers; determining a training sample set and a test sample set based on the fault case library of the transformers; establishing a fault judgment decision-making tree on the basis of the training sample set and the test sample set, and pruning and optimizing the decision-making tree to obtain a transformer fault diagnosis analysis model; wherein the transformer fault case comprises the type of the dissolved characteristic gas in the transformer oil, the value of the dissolved characteristic gas and the equipment state type of the transformer.The decision-making tree is pruned and optimized on the basis of the sample set, and a fault diagnosis analysis model can be obtained to find out a latent fault inside a transformer in time. The problems that a traditional oil chromatography three-ratio method is incapable of diagnosing certain faults some and is low in judgment correct rate due to incomplete failure coding and lack of coding areeffectively solved.

Description

technical field [0001] The invention relates to the field of transformers, in particular to a transformer fault diagnosis method and system. Background technique [0002] The transformer is an important equipment in the power system, and whether it can work normally directly affects the safe and reliable operation of the power system. [0003] Oil-immersed transformer adopts oil-paper insulation structure, mainly including insulating material oil, insulating paper and insulating cardboard. When a latent fault occurs inside the transformer, under the action of heat and electricity, the transformer oil and solid insulating material will gradually age and decompose, resulting in Various low molecular hydrocarbons, CO and CO 2 and other gases, the composition and content of the gas generated at the fault point depends on the fault type, fault location and fault energy level. [0004] At present, the main method of transformer fault diagnosis in the industry is to analyze the d...

AI Technical Summary

Problems solved by technology

The traditional methods for diagnosing dissolved gas in transformer oil include the three-ratio method and the David’s triangle method, etc., which have a low correct rate and some faults cannot be diagnosed due to incomplete and missing fault codes.

Images