Dual-frequency transformer and traction power supply system

Abstract

The invention provides a dual-frequency transformer, which comprises a primary winding RA-1, a primary winding RA-2 and a primary winding RA-3, and is characterized in that the upper dotted terminals of the primary winding RA-2 and the primary winding RA-3 are respectively connected with one end of a parallel switch Ka-1 and one end of a parallel switch Ka- 2; the transformer also comprises a secondary winding Rb-1, a secondary winding Rb-2 and a secondary winding Rc, wherein the lower end of the secondary winding Rb-1 with the same name is connected with one end of a parallel switch Kc- 1; the upper dotted terminal of the primary winding RA-1 and the lower dotted terminal of the primary winding RA-3 are used as the input ends of the dual-frequency transformer; the upper dotted terminal of the secondary winding Rb-1 and the lower dotted terminal of the secondary winding Rc serve as output terminals of the dual-frequency transformer. According to the invention, the number of equipment investment can be reduced, switching among multiple power supply sources is not needed when the traction network supplies power to locomotives with different frequency power supply systems, incoming line redundancy can be reduced, the construction cost is saved, and the system structure is simplified.

Description

Technical field [0001] The invention relates to electrified railway and urban track traction power supply transformer technology, and specifically relates to a dual-frequency transformer and traction power supply system. Background technique [0002] There are various power supply systems for railway traction networks in various countries around the world. my country's large railways generally adopt the one-way power supply system of 25kV power supply. Japan's traction power supply voltage has two systems of 20 / 25kV and 50 / 60Hz. Germany uses 15kV and 16.7Hz power supply system. Under various power supply systems, the corresponding vehicle AC drive system designs are different. At present, my country's electric locomotive research and development capabilities are developing by leaps and bounds. The technical level of standard EMUs, Fuxing High-speed Railway and other trains has reached the international advanced level. While my country's independently developed locomotives me...

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Problems solved by technology

[0004] At present, the traction power supply topology of the test platform that needs to test low-frequency locomotives generally uses power electronic converter equipment to convert the three-phase power frequency power into 16.7Hz frequency AC power, and then outputs it to the test traction network through a transformer suitable for 16.7Hz. During the power frequency locomotive test, the power supply line of the traction network needs to be switched to the transformer output terminal suitable for power frequency. Such a test environment not only requires a lot of equipment investment, occupies a large space, wastes resources and investment, but also causes redundant incoming lines

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