Metro traction power supply device with over-voltage suppression function

Abstract

The invention discloses a metro traction power supply device with the over-voltage suppression function, a bilateral power supply direct current traction power supply circuit is formed by connecting four uplink and downlink traction feeders of an alternating current circuit breaker DL, a traction rectifier transformer T, a rectifier unit R, a direct current circuit breaker DS and a manual switch M, and the metro traction power supply device is characterized in that voltage suppression units used for avoiding current mutation of the power supply system and further suppressing the production of over-voltage are arranged on an uplink contact net line and a downlink contact net line of a dead zone. The metro traction power supply device can lead the current in the traction of the circulation of the power supply system to be transferred from a train to a capacitor during the process that a metro (light rail) runs from a live zone to the dead zone in the traction working condition or the regenerative brake working condition, and the energy stored by an inductor of a circuit of the power supply system can be released through a passage formed by the capacitor, thereby avoiding the production of the current mutation in the power supply system, eliminating the production of the over-voltage and solving the problem of over-voltage breakdown of the train produced through the dead zone.

Description

Technical field [0001] The invention relates to a voltage suppressing device for a subway (light rail) train passing through a non-electric zone, which is suitable for a traction power supply system using direct current power supply. Background technique [0002] The subway or light rail generally adopts a DC traction power supply system. The traction power network of the DC traction system is very unique, and mainly has the following three application forms: ①The positive pole is fed by the contact rail, and the negative pole is returned by the running rail. In the lower DC traction system, the positive pole contact rail is an additional rail erected parallel to the outside of the track along the running track line, commonly known as the third rail; The method has a wide range of applications, and different voltage levels and different operating speeds are used, mainly for safety reasons; ③Dedicated negative return line method, such as the London subway, Vancouver light ra...

AI Technical Summary

Problems solved by technology

Under normal circumstances, the current change rate di / dt of the power supply system is very small, and the effect of inductance in the power supply system can be ignored, but when the train passes through the dead zone under traction or regeneration conditions, the current change rate di / dt will be very large, even in L 1 In a very small case, a very high overvoltage will also be generated, and the overvoltage will break down the train components, so measures must be taken to suppress this overvoltage

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