Transformer fault detection method

Abstract

The invention discloses a transformer fault detection method. The method based on a transformer electrical parameter fault feature library includes transformer model building, transformer electrical parameter fault feature library establishment and fault detection. The method is implemented in an all-digital manner, various transformer faults such as external open circuit fault, internal open circuit fault, to-earth short-circuit fault, turn-earth short-circuit fault, turn-to-turn short-circuit fault, external phase fault and internal phase fault can be judged accurately, and proper expansion can be performed according to actual demand. The method is widely applicable to transformers such as oil immersed transformers, water cooled transformers, air cooled transformers and air and water cooled transformers, occurrence of the transformer faults is prevented and judged to the uttermost extent, the technical problems about parameter detection, fault protection and fault diagnosis are solved, safety and maintainability of the system are improved, and difficulty and consumed time for system troubleshooting are lowered.

Description

technical field [0001] The invention belongs to the field of transformer and fault diagnosis, and in particular relates to a transformer fault detection method. Background technique [0002] At present, the dissolved gas analysis in oil (DGA) is mainly used for transformer fault diagnosis, but the dissolved gas analysis in oil can only be applied to oil-immersed transformers, and cannot be widely used in water-cooled transformers, air-cooled transformers and air-water-cooled transformers, etc. type of transformer. Moreover, the dissolved gas analysis method in oil can only passively prevent the expansion of the fault when the dissolved gas in the transformer oil changes significantly after the fault occurs, and the effect is often not good. [0003] This method cannot actively prevent the occurrence of faults, and the fault response speed is relatively slow. It cannot detect the electrical parameters of the transformer, and cannot diagnose the type of fault and the location...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art that the occurrence of faults cannot be actively prevented, the fault response speed is slow, the electrical parameters of the transformer cannot be detected, and the fault type and fault point location cannot be diagnosed, and a transformer fault detection method is proposed , can be widely applied to oil-immersed transformers, water-cooled transformers, air-cooled transformers and air-water-cooled transformers and other types of transformers, can judge the occurrence of transformer faults in advance, prevent and judge the occurrence of transformer faults to the greatest extent, and solve parameter detection, The technical problems of fault protection and fault diagnosis improve the safety and maintainability of the system, and reduce the difficulty and time spent in troubleshooting the system

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