A method for independent distribution of working and safety grounding suitable for high-speed trains

Abstract

The invention discloses a method for independent distribution of working and safety grounding applicable to high-speed trains, specifically: the working grounding system and the safety grounding system are independently distributed on two rail sides; The high-voltage alternating current is sent to the primary side of the transformer through the vacuum circuit breaker, then slides to the wheel through the grounding carbon brush, and then makes rolling contact with the rail, and finally reaches the return line of the substation through the rail to form a return flow; safety grounding The car of the system is directly slid on the wheel by the grounding carbon brush, and then rolls with the second rail to discharge the overvoltage; Abnormal wear of the grounding carbon brush; reduce the damage caused by the impulse voltage generated by the overvoltage, and improve the grounding stability of the train.

Description

technical field [0001] The invention belongs to the technical field of rail transit grounding, and in particular relates to an independent distribution method for working and safety grounding suitable for high-speed trains. Background technique [0002] With the increase of high-speed train operating speed and load capacity, the traction power continues to increase, which puts forward higher requirements for the guarantee of high-speed railway operation safety. The high-speed railway traction power supply system is the power source of high-speed trains, and the improper setting of the matching train grounding system may threaten the safe operation of high-speed railways. [0003] The grounding system of high-speed trains is mainly divided into safety grounding and working grounding. The key point of work grounding is the grounding method of the high-voltage cable shielding layer. The high-speed EMU obtains current from the catenary through the pantograph slide plate, and c...

AI Technical Summary

Problems solved by technology

However, when lightning tripping or overvoltage impact occurs, the lightning arrester or grounding switch is closed, and the transient impact current will be loaded on the grounding resistance, causing the vehicle body voltage to rise instantaneously. Since the vehicle body is the public reference ground for weak electric signals, the impact voltage causes The counterattack may damage the vehicle control, communication and other weak current equipment

At the same time, when the arrester is turned on, the grounding resistance is in parallel with the transformer of the main circuit, and the high-voltage lightning wave will still be loaded on both ends of the vehicle transformer, and coupled to the secondary side through the transformer, causing damage to the equipment connected to the secondary side of the transformer.

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