Working grounding and safe grounding independent distribution method suitable for high-speed train

Abstract

The invention discloses a working grounding and safe grounding independent distribution method suitable for a high-speed train. The method comprises the specific steps that a working grounding systemand a safe grounding system are independently distributed on two steel rail sides; a compartment of the working grounding system is connected with the high-voltage alternating current through a pantograph type current collector from the contact network, and the high-voltage alternating current is transmitted to the primary side of a transformer through a vacuum circuit breaker, then is in slidingcontact with wheels through a grounding carbon brush, then is in rolling contact with a first steel rail and finally reaches a return line of a substation through the first steel rail for form return;and the compartment of the safe grounding system is directly in sliding contact with wheels by the grounding carbon brush and then is in rolling contact with a second steel rail to discharge the overvoltage. By the adoption of the working grounding and safe grounding independent distribution method, the circulation of a vehicle body can be effectively reduced, the problems that vehicle-mounted weak current equipment is interfered by the circulation of the vehicle body, abnormal heating of the equipment is generated and abnormal wear of the grounding carbon brush is caused are avoided; and thedamage caused by the impact voltage generated by the overvoltage is reduced, and the grounding stability of a train is improved.

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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