Method and device for monitoring geomagnetic induction current in power supply system of high-speed railway traction network

Abstract

A high-speed rail traction network power supply system earth induction current monitoring method and a device. The device is installed at the connection neutral point position on the secondary side of a traction transformer and comprises a signal acquisition unit, a signal processing unit, a control unit, a data analysis unit, a data storage unit and a storage server, wherein signal acquisition unit perform signal acquisition through two ways, one way comprises a low-pass filter at 1Hz cut-off frequency, a band rejection filter and a magnetic flux gate current sensor, the other way comprises a voltage transformer and a current transformer, and the control unit transmits a signal acquisition result and an analysis result to the storage server for analysis and inquiry and can gives an alarm through an alarm unit. The problem of difficult installation of the monitoring position due to the fact that a neutral point on the high-voltage side of the transformer of a high-speed rail traction network power supply system is not grounded can be well solved, the influence on GIC monitoring of locomotive impact working current is eliminated, and the high-speed rail traction network power supply system earth induction current monitoring method and the device has the advantages of being good in anti-interference capacity, high in integration degree, low in device cost and the like.

Description

technical field [0001] The invention belongs to the technical field of monitoring the power supply system of the high-speed rail traction network. In particular, it provides a monitoring method and device for the geomagnetic induction current (GIC) of the power supply system of the high-speed rail traction network, which is used to monitor the GIC size of the power supply system of the high-speed rail traction network during a magnetic storm . Background technique [0002] As the scale of my country's high-speed rail electrical system and communication system gradually increases, the impact of GIC caused by geomagnetic storms on high-speed rail electrical systems and communication systems is also gradually increasing, especially on high-speed rail traction transformers. In order to prevent geomagnetic storms To cause fatal hazards to the high-speed rail traction network system, it is necessary to accurately measure the GIC generated by the geomagnetic storm in the high-speed ...

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Problems solved by technology

[0003] Since there is no GIC monitoring device specifically for the power supply system of the high-speed rail traction network in my country, there are only monitoring methods and devices for the geomagnetic induction current of the power grid

However, the power supply system of the high-speed rail traction network is different from the power transmission and transformation system of the power grid. Most of the traction transformers in the power supply system of the high-speed rail traction network adopt V / V connection mode. The neutral point of the high-voltage side is not grounded, and the GIC will not flow. Grounding through the rails makes the secondary side winding of the traction transformer a flow path for the working current of the locomotive, which will affect the GIC monitoring

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