Fault diagnosis method of traction transformer based on model diagnosis

Abstract

The invention discloses a fault diagnosis method of a traction transformer based on model diagnosis. The method comprises the steps of building a two-layer structure model of the traction transformer by knowledge of a structure model of the traction transformer, measuring actual operating parameters of the traction transformer by a voltage transformer and a current transformer, and inputting the parameters into a diagnostic system to diagnose. The diagnosis is divided into an offline diagnosis part and an online diagnosis part by the fault diagnosis method at the same time. Therefore, the diagnosis speed is improved, and a fault element and the fault type are finally diagnosed by consistency diagnosis and abductive diagnosis. A simulation result indicates that the faults such as short circuit, open circuit, and interturn grounding of a winding of the traction transformer can be rapidly and accurately diagnosed, and the fault diagnosis method is a new fault diagnosis method of the traction transformer.

Description

technical field [0001] The invention belongs to the technical field of fault diagnosis of a traction power supply system, in particular to a fault diagnosis method for a traction transformer based on model diagnosis. Background technique [0002] The traction power supply system is the power supply system of the railway. Once a part of it fails and the power supply is interrupted, it will not only affect the normal operation of the trains on the power supply line, but may even trigger a chain reaction in the current high-density and high-flow railway transportation system, causing The poor operation of many railway lines caused significant economic losses. As an important part of the traction power supply system, the safe operation of the traction transformer is directly related to the reliable and stable operation of the traction power supply system, and then to the normal and orderly operation of the railway. Therefore, the normal operation of the traction transformer is ...

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Problems solved by technology

The literature "Liu Zhigang, Zhong Wei, Deng Yunchuan, Qu Changjun. Model-Based Diagnosis Method for Traction Substation Faults. Proceedings of the Chinese Society for Electrical Engineering, 2010, 30(34): 36-41" uses MBD for fault diagnosis of traction substations, but in The equipment diagnosis of the traction transformer adopts a simple equivalent component method, which cannot diagnose the specific faults of the traction transformer, but can only diagnose the faults of the circuits on both sides of the traction transformer; in addition, the diagnosis method is only single-layer modeling and direct reasoning The method cannot effectively and comprehensively diagnose the fault of the traction transformer

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