A Bilateral Power Supply System for Electrified Railway

Abstract

The invention discloses a bilateral power supply system for an electrified railway. The bilateral power supply system consists of adjacent traction power substations, traction nets and a section post, wherein the traction nets and the section post are arranged between the adjacent power substations; the secondary sides of traction transformers of the traction power substations are connected in series with reactors respectively; a circuit breaker in the section post is used for communicating the traction nets on both sides of the circuit breaker to construct bilateral power supply; the sum of the reactance values of the reactors in two adjacent traction power substations is equal to a minimum value required by current balancing of a power system; the ratio of the reactance values of the reactors in adjacent traction power substations to the sum of leakage impedance values of corresponding traction transformers is inversely proportional to the ratio of rated capacities of the traction transformers of the adjacent traction power substations; the traction transformers and the reactors which are connected in series with the transformers can be combined into a more compact high-leakage-reactance traction transformer in order to reduce land occupation of the traction power substations; a neutral section where the section post between adjacent traction power substations is positioned can be eliminated without influencing normal running of the power system, and the technology is advanced and is easy to implement.

Description

technical field [0001] The invention relates to a bilateral power supply system for an electrified railway, in particular to a bilateral power supply system for an electrified railway pulled by an AC-DC electric train that cancels partitions and separates phases. Background technique [0002] The single-phase system has the advantages of simple structure, low construction cost, convenient operation and maintenance, etc., which determines that single-phase power-frequency AC power is generally used for the traction load of electric trains in electrified railway traction networks. In order to distribute the single-phase traction load as evenly as possible in the three-phase power system, the electrified railway traction network adopts the scheme of phase sequence rotation and phase separation and partition power supply. The adjacent power supply areas at the phase-splitting partitions are divided by phase-splitting insulators to form electrical split phases, also known as phas...

AI Technical Summary

Problems solved by technology

At the present stage, there are mainly ground switch automatic switching over-phase separation, vehicle-mounted automatic over-phase separation, and pole-mounted automatic over-phase equalization. However, there are still transient electrical processes in which the train passes through the electric phase separation during switch switching, which is prone to generate large operating overvoltages or Overcurrent, causing accidents such as traction network and on-board equipment burning, and even automatic over-phase failure, still affects the reliability of power supply and the safe operation of trains

It can be seen that even if the automatic over-phase separation technology is adopted, the electric phase separation link is still the weak link in the entire traction power supply system

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