Railway signal power supply system

Abstract

The embodiment of the invention discloses a railway signal power supply system. The railway signal power supply system comprises a phase-sensitive track circuit, a power supply end and at least two power supply circuits, the power supply circuit at least comprises an isolation module, a local power supply, a track power supply, a first switch and a second switch, the isolation module is electrically connected with the power supply end, the local power supply and the track power supply, the local power supply is electrically connected with the phase-sensitive track circuit through the first switch, and the track power supply is electrically connected with the phase-sensitive track circuit through the second switch; the isolation module is used for isolating a first input power supply signal input by a power supply end, outputting a first output power supply signal and a second output power supply signal, and respectively outputting the first output power supply signal and the second output power supply signal to a local power supply and a track power supply; the local power supply is used for outputting a first output power supply signal to the phase-sensitive track circuit according to the switching state of the first switch; the track power supply is used for outputting the second output power supply signal to the phase-sensitive track circuit according to the switching state of the second switch. Therefore, two paths of power supply can be provided for the phase-sensitive track circuit.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of railways, and in particular, to a railway signal power supply system. Background technique [0002] In the field of railway signal power supply, 25Hz power supply is mainly used in electrified railways to supply power to railway 25Hz phase-sensitive track circuits. Among them, the track circuit uses the two rails of the railway as conductors, the two ends are insulated, and the closed circuit of the power transmission and power receiving equipment is connected, which is mainly used to monitor the occupancy of the line. The 25Hz power supply includes two outputs, one output is track output power (220V / 25Hz), and the other output is local output power (110V / 25Hz). The local output power phase is 90 degrees ahead of the track output power. [0003] There are only two existing 25Hz power supply modes: one is that the output adopts the main and standby output, that is, the two 25Hz powe...

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Problems solved by technology

[0004] However, these two methods have certain disadvantages: the first method is not easy to achieve expansion

In the case of large-capacity load applications, it is generally realized by the method of load splitting, but in order to realize redundant power supply, each bundle needs to be equipped with two 25Hz power supplies, and the configuration cost is high; The physical switching delay of the relay will generally cause a 30-60ms output interruption during the switching process. For non-delayed load equipment, it may cause the load equipment to be powered off and restarted; in addition, two 25Hz low-frequency transformers are required to realize input / output. Electrical isolation between output / output, relatively large volume and weight, and relatively high cost

Although the second method can achieve capacity expansion, there are still deficiencies, which are mainly reflected in two aspects: First, because the interior is not isolated, parallel machine expansion must input the same source, otherwise it may cause input side circulation, resulting in intermediate bus support The capacitor voltage is too high (normal bus capacitor voltage + line voltage rectification value), and even cause power supply damage, so the configuration flexibility is insufficient

Secondly, two 25Hz low-frequency transformers are still needed to realize the input / output, and the electrical isolation between the output / output, the volume and weight are relatively large, and the cost is relatively high

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