Asymmetric high-voltage pulse track circuit with lightning protection function and lightning protection method

Abstract

The invention discloses an asymmetric high-voltage pulse rail circuit having a lightning protection function. The asymmetric high-voltage pulse rail circuit comprises a sending end circuit and a receiving end circuit, wherein the sending end circuit mainly comprises a high-voltage pulse signal transmitter, a first lightning protection circuit and a sending end transformer, the high-voltage pulse signal transmitter, the first lightning protection circuit and the sending end transformer are sequentially connected with a sending end of a steel rail, the receiving end circuit mainly comprises a high-voltage pulse signal receiver, a second lightning protection circuit, a relay and a receiving end transformer, the high-voltage pulse signal receiver, the second lightning protection circuit, the relay and the receiving end transformer are sequentially connected with a receiving end of the steel rail, the first lightning protection circuit employs horizontal and longitudinal lightning protection circuits, the second lightning protection circuit comprises a lightning protection transformer and a lightning protection unit, and the lightning protection unit is connected in parallel with a primary of the lightning protection transformer. The asymmetric high-voltage pulse rail circuit is good in lightning protection effect, the sending end employs horizontal and longitudinal lightning protection circuits, the receiving end employs dual lightning protection circuits of the lightning protection transformer and the lightning protection unit, and the rail circuit equipment is effectively protected and has little possibility of being damaged by lightning.

Description

technical field [0001] The invention relates to the technical field of rail transit, in particular to an asymmetrical high-voltage pulse rail circuit with lightning protection function. Background technique [0002] The track circuit is a circuit composed of rail lines and rail insulation. It is used to supervise the occupation of trains in sections or trains and shunting trains in stations. It is the most commonly used method. The asymmetrical high-voltage pulse track circuit utilizes its characteristics of large instantaneous power and high instantaneous current in the shunt, which is beneficial to improve the effect of solving the poor shunt of the track circuit. [0003] As the key safety control equipment in the railway signal system, the asymmetrical high-voltage pulse track circuit is easily damaged by lightning because some of the equipment is placed outdoors beside the track. influences. The lightning protection measure of the existing track circuit is to use ligh...

AI Technical Summary

Problems solved by technology

[0003] As the key safety control equipment in the railway signal system, the asymmetrical high-voltage pulse track circuit is easily damaged by lightning because some of the equipment is placed outdoors beside the track. influences

The lightning protection measure of the existing track circuit is to use lightning protection components in the sending end circuit and the receiving end circuit for lightning protection, that is, to simply adopt longitudinal lightning protection. Most of the existing technologies use piezoresistors, gas discharge tubes, gas gaps, The disadvantage of lightning protection components such as transient diodes is that there is a short-circuit failure mode in the lightning protection components. Once it occurs, it will cause the track circuit to be grounded vertically, that is, the occupancy of the train cannot be detected normally, which will cause the safety risk of the track circuit and cause rail traffic accidents.

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