A rail transit traction transformer turn-to-turn short circuit detection and protection device

Abstract

The invention discloses a turn-to-turn short-circuit detection and protection device for rail transit traction transformers. The junctions of the primary side windings of the transformers close to the ground end are extended to the outside of the transformer, and connected in series to current sensors through switch relays respectively. The output ends of the current sensors are connected to the The input end of the low-pass filter circuit and the output end of the low-pass filter circuit are connected to the input end of the single-chip microcomputer; the single-chip microcomputer obtains the effective value of each winding current through the integral solution, and judges whether each winding turns by comparing the effective value. Short circuit between windings or short circuit between winding and transformer shell; when the current of a certain winding is too large, the single chip microcomputer outputs a signal to the amplifier circuit, the signal is amplified by the amplifier circuit and sent to the relay drive circuit, and the relay drive circuit drives the switch relay to cut off the corresponding winding. The invention improves the reliability of high-speed rail power supply and prevents equipment from being damaged, and has high use value for detecting and preventing interturn short circuit of transformers.

Description

technical field [0001] The invention relates to the technical field of rail transit power transmission, in particular to an inter-turn short circuit detection and protection device for a rail transit traction transformer. Background technique [0002] High-speed railway has become the main mode of transportation favored by countries all over the world due to its characteristics of fast speed, environmental protection, comfort and safety. In the past ten years, with the rapid development of my country's high-speed rail technology, domestic rail transit lines have basically been fully electrified. The running speed of the high-speed rail is constantly increasing, and the driving frequency is also steadily increasing. Stable and continuous power supply and transmission are the basis for the safe and reliable operation of the train; and the traction transformer is the core of the power transmission of the high-speed rail pantograph-catenary system. Whether the transformer can be...

AI Technical Summary

Problems solved by technology

[0007] In view of the above problems, the purpose of the present invention is to provide a transformer that can solve the problems of high-speed trains losing power and burning equipment due to inter-turn short circuit or winding and transformer shell short circuit, and has high power supply reliability and can effectively detect inter-turn short circuit of vehicle-mounted transformers. Turn-to-turn short circuit detection and protection device for rail transit traction transformer

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