A system and method for suppressing and controlling overvoltage during operation of an electric traction locomotive

Abstract

The invention discloses an electric traction locomotive operating overvoltage suppression control system and method. The system includes a hoisting bow overvoltage suppressor connected in series between a pantograph and a circuit breaker, and a circuit breaker overvoltage suppressor connected in series between the circuit breaker and a main transformer. Voltage suppressor, and a new type of protective grounding device connected in series in the grounding cable between the car bottom bogie and the grounding carbon brush; The car body resistance bears most of the overvoltage in the circuit through the grounding cable, which reduces the surge overvoltage of the car body; and the remaining overvoltage is released through the grounding cable in the new protective grounding device, and the overvoltage of the car body is greatly reduced. reduce. The present invention avoids damage to weak electrical signal equipment and insulation breakdown caused by operating overvoltage due to the overvoltage generated by the action of the pantograph and the circuit breaker during the lifting of the bow, over-phase separation, and short-circuit faults.

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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