Electric traction locomotive operation overvoltage suppression control system and method

Abstract

The invention discloses an electric traction locomotive operation overvoltage suppression control system and method. The system comprises a pantograph rising and falling overvoltage suppressor connected in series between a pantograph and a circuit breaker, a circuit breaker operation overvoltage suppressor connected in series between the circuit breaker and a main transformer, and a novel protection grounding device connected in series in a grounding cable between a carriage bottom bogie and a grounding carbon brush. When the circuit breaker acts, the circuit breaker operates an inductor in the overvoltage suppressor to be connected into a circuit, a train protection grounding system is directly grounded through a grounding cable, a train body resistor bears most overvoltage in the circuit, and the train body pantograph rising surge overvoltage is reduced. And the residual overvoltage is released through a grounding cable in the novel protection grounding device, so that the overvoltage of the vehicle body is greatly reduced. In the processes of pantograph rising and falling, neutral section passing, short circuit faults and the like, due to overvoltage generated by actions of a pantograph and a circuit breaker, weak current signal equipment damage and insulation breakdown caused by overvoltage operation are avoided.

Description

technical field [0001] The invention relates to the technical field, in particular to an electric traction locomotive operation overvoltage suppression control system and method. Background technique [0002] During the operation of my country's electric traction locomotives, the high-voltage system is vulnerable to the threat of various operating overvoltages, such as the surge overvoltage generated during the bow raising and lowering process; the overvoltage generated by operating the circuit breaker when the EMU is over-phased; There are many situations such as overvoltage generated by operating the circuit breaker during the process. The surge overvoltage of the vehicle body generated by the above working conditions will affect the vehicle's weak current signal equipment, causing logical disorder of the equipment, accelerating insulation aging, and even causing insulation breakdown, resulting in the inability of the vehicle's sensors or control equipment to work normally....

AI Technical Summary

Problems solved by technology

However, due to the difference in resistance between the rail circuit and the car body circuit, this grounding method will make the current of the working ground easily go back to the car body through the protective ground, causing local heating and local circulation of the car body, and when the current flows into the bearing, it will cause Abnormal shaft temperature, causing bearing electric candle

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