Method and device for monitoring geomagnetically induced current of high-speed rails

Abstract

The invention belongs to the technical field of monitoring of high-speed rail electrical systems and discloses a method and a device for monitoring geomagnetically induced current of high-speed rails. A high-speed rail geomagnetic storm damage monitoring and recording device comprises a traction main transformer and an earth box with a traction backflow collection function, a three-phase power source is connected into a traction substation, a traction backflow wire running through an earth wire, a PW protection wire and a choke transformer midpoint lead connected with two rail bars are arranged in the earth box which is an independent box structure , and the earth box is connected with an earth electrode of the traction transformer. Since interference exists in GIC (geomagnetically induced current) sampling signals, local high-frequency noise interference can be effectively eliminated by adopting a wavelet analysis method for variable-size localization analysis of time domain and frequency domain windows. The device comprises a signal acquisition sensor, a synchronous signal acquisition card and an industrial control computer. The device with a threshold alarming function is capable of sending alarm signals when monitoring quantity exceeds a threshold, so that influences of geomagnetic storm on a railway system can be known timely and conveniently. By monitoring for a period of time, direct-current magnetic bias current of the traction transformer is recorded to provide data for analysis on safety operation of a high-speed rail tractive power supply system.

Description

technical field [0001] The invention belongs to the technical field of monitoring high-speed rail electrical systems, and in particular relates to a monitoring method and device for high-speed rail geomagnetic induction current. Background technique [0002] Accompanied by the occurrence of strong space weather storms, the space current system in the magnetosphere-ionosphere produces strong disturbances to the Earth's magnetic field. At this time, a global strong change in the geomagnetic field can be observed on the ground, which is called a "magnetic storm". According to the law of electromagnetic induction, it can be known that the time-varying magnetic field will induce an electric field in the earth and form a ground current due to the conductance of the earth. A geomagnetically induced current (GIC for short) will be generated in it. In the past, because most of my country's land is located in the middle and low latitudes, and the railway operation mileage is short, t...

AI Technical Summary

Problems solved by technology

Since the monitoring of the high-iron magnetic storm effect has not yet been carried out at home and abroad, the project hopes to learn from the research results of the power grid GIC to study and analyze the monitoring methods and technologies for the high-iron magnetic storm effect

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