AT power supply system of electrified railway

Abstract

The invention relates to an AT power supply system of an electrified railway, which comprises the following: an output end of a 55Kv traction transformator submargin of a traction substation is connected with contact wires of a railway traction network, the other output end thereof is connected with negative feeder of the railway traction network; autotransformers are set in the railway traction network every 10-20 km, the autotransformer near to the traction transformator is 5-15 km away from the traction transformator; one end of the autotransformer is connected with the contact wire of therailway traction network, a midpoint thereof is connected with rails, and the other end is connected with negative feeder of the railway traction network. The output of the traction transformator is not provided with an autotransformer, thus reducing investment; no midpoint tap is mounted on the traction transformator so as to avoid arranging rail return feeder for the traction substation, thus simplifying manufacturing of the traction transformator and improving usage rate of capacity of the traction transformator; the current in contact wire and negative feeder of a first AT section is always half of that in load current, thus improving line transmission ability.

Description

technical field [0001] The invention relates to a traction power supply system of an electrified railway, in particular to an AT power supply system of an electrified railway. Background technique [0002] The traction power supply system is a special single-phase power supply mode. At present, the traction power supply modes used in the world mainly include direct power supply mode and AT power supply mode. The traditional direct power supply method has short power supply distance and weak ability to prevent communication interference, which can no longer meet the development requirements of high-speed and heavy-duty railways. The AT power supply mode has long power supply distance, high transmission power, and strong anti-interference ability of communication. It is the main direction of the development of high-speed and heavy-haul railways. [0003] Currently used AT power supply modes mainly include Japanese AT power supply mode and French AT power supply mode. [0004...

AI Technical Summary

Problems solved by technology

But its disadvantage is: the export of the traction transformer has an autotransformer, and the investment is relatively large

[0020] In short, in terms of power supply performance, the Japanese AT power supply mode is better, but the investment is relatively high. The French AT power supply mode reduces the investment due to the reduction of a self-coupling transformer, but there are certain limitations in the power supply performance, and the structure of the traction transformer complex and expensive

Images