In-phase power supply system for AC transaction substations

Abstract

The invention discloses an in-phase power supply system for AC transaction substations. The system comprises a first traction transformer, wherein a primary side of the first traction transformer is connected with a first external power supply; a first output end and a second output end of the secondary side of the first traction transformer are both connected with a power supply bus; a second traction transformer, wherein a primary side of the second traction transformer is connected with a second external power supply; a first output end and a second output end of the second traction transformer are connected with a power supply bus; the first traction transformer and the second transaction transformer are non-single phase traction transformers; a phase-separating section is connected with a left power supply arm and a right power supply arm through a first neutral section insulator and a second neutral section insulator respectively; the phase-separating section is connected with the power supply bus through a first switch; the left power supply arm is connected with the power supply bus through a second switch; the right power supply arm is connected with the power supply bus through a third switch. The system is more convenient to maintain the feeder line corresponding to the traction power supply network based on the realization that the phase separation zone is charged and the voltage amplitude and phase of the left and right power supply arms and the phase-separating section are the same.

Description

technical field [0001] The invention relates to the technical fields of railway transportation equipment and power electronics, in particular to an AC traction substation in-phase power supply system. Background technique [0002] At present, most of the electrified railways in the world use AC power supply systems. In order to balance loads and eliminate negative sequence components, AC power supply systems usually adopt the power supply mode of segmental rotation phase sequence, which leads to phase separation areas on the traction power supply network. The traction power supply network of the existing substation adopts a three-stage method of left power supply arm, phase separation area and right power supply arm, and the two are connected by phase separation insulation devices, and the phase separation area has no power. When the train passes through the phase separation area from the left power supply arm of the substation to the right power supply arm, since there is n...

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Problems solved by technology

However, when using the same-phase power supply system in the prior art, since the left power supply arm, the phase-splitting area, and the right power supply arm are connected, when a fault occurs in a certain feeder line, the entire traction power supply network needs to be powered off. It is not easy to implement, and it is not easy to maintain the feeder corresponding to the traction power supply network

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