Urban rail transit traction power supply system and substation

Abstract

The invention provides an urban rail transit traction power supply system and a substation. The traction power supply system is used for suburb urban rails and comprises a first rectifier unit and a second rectifier unit, wherein the first rectifier unit and the second rectifier unit are independently installed in a unit shell with the insulation grade of 3kV,; a 3000V power supply is output whenthe first rectifier unit and the second rectifier unit operate in series through an isolating switch; and a 1500V power supply is output during parallel operation. The system has the advantages of being low in cost, high in power supply capacity, long in power supply distance and small in influence of electrical insulation on civil engineering.

Description

technical field [0001] The invention relates to an urban rail transit line technology, in particular to an urban rail transit traction power supply system and a substation. Background technique [0002] For urban rail transit systems in urban areas, due to the short distance between stations, the traction motors of DC traction subway vehicles can frequently perform acceleration and deceleration performance, and the maximum speed target value is generally below 80km / h, and the distance between stations is generally 1.4km Left and right, the use of DC750V and DC1500V has advantages in terms of operation economy, reliability, and maintainability. [0003] As for suburban urban rail transit lines, the distance between stations is relatively long, generally 4 to 7 kilometers, and the operating speed is relatively high, generally 120km / h to 160km / h. In this case, the DC750V power supply system can no longer meet the requirements in pantograph-catenary current receiving and tracti...

AI Technical Summary

Problems solved by technology

In this case, the DC750V power supply system can no longer meet the requirements in pantograph-catenary current receiving, traction rectification equipment matching, etc.

[0004] That is to say, for suburban (city and county) rapid urban rail transit lines, if the traction power supply system still uses the existing urban rail transit DC750V and DC1500V power supply, the power supply radius is too small, it is inconvenient to operate and maintain the traction station in the interval, and the locomotive The further increase in power will cause problems such as insufficient current-carrying capacity of the wires, excessive power loss, and uneconomical operation; if the AC27.5kV electrified railway power supply system is used, the voltage level will be too high and the insulation distance will be too large, which will have a great impact on civil construction investment, and traction will change. Higher investment in external power supply of power station

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