Direct-current (DC) 1500V four-rail mounting structure applied to urban rail transit

Abstract

The invention discloses a direct-current (DC) 1500V four-rail mounting structure applied to urban rail transit. The structure comprises a traction rail, a return-current rail and two rows of running rails, wherein an insulation bracket is arranged on one side of the running rails; and the traction rail and the return-current rail are clamped in insulation blocks of the insulation bracket. In a DC traction four-rail power supply system for the urban rail transit of the invention, the four rails (the return-current rail) are insulated from other facilities such as a track bed and the like completely without stray current, so stray-current resistant measures and facilities are no longer taken into consideration. The DC1500V four-rail mounting structure applied to the urban rail transit has the greatest advantages of protecting structural reinforcing steel and metal pipelines in stations, tunnels and the like from being corroded by the stray current, prolonging the service life of each of tunnels, bridges, pipelines and the like in rail transit and guaranteeing the safety of an urban rail transit system.

Description

technical field [0001] The invention relates to a power supply system for providing traction power for electric locomotives in urban rail transit, in particular to a DC1500V four-rail (return rail) installation structure applied to urban rail transit. Background technique [0002] The traction network of urban rail transit power supply system is a power supply system that provides traction power for electric locomotives. It is composed of catenary and return network. The catenary is the positive pole and the return network is the negative pole, which are respectively connected to the traction substation. The catenary is divided into contact rail and overhead catenary according to the installation position and contact wire. At present, most of the return networks of urban rail transit lines in the world use running rails as return rails. At present, no matter the DC1500V or DC750V voltage system is adopted in my country’s urban rail transit, power is supplied to vehicles thr...

AI Technical Summary

Problems solved by technology

Although it was considered in the previous urban rail transit power supply system to set up a stray current collection network in the overall ballast bed to reduce the corrosion of stray currents to metal structures, stray current corrosion protection measures can only reduce the degree of stray currents to metal corrosion. It cannot completely solve the corrosion effects of stray currents. As the operation age increases, the leakage of stray currents will gradually increase

At the same time, when the traction backflow passes through the rails, a potential difference is generated on the rails, which is transmitted to the compartment through the wheels, posing a threat to the personal safety of passengers. It is necessary to install a rail potential limiting device on the station. Although this solution can solve the impact of the rail potential on passengers , but frequent actions may affect the reliability of the power supply system

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