Method and device for protecting traction feeder line of single-phase power-frequency alternating-current electrified railway

Abstract

The invention discloses a method and device for protecting a traction feeder line of a single-phase power-frequency alternating-current electrified railway. The device comprises a protection function module, an auxiliary function module, a measuring and controlling module, a locking module and a communicating module; wherein the protection function module comprises a four-section distance protection unit, a current quick-breaking protection unit, a low-voltage overcurrent protection unit, a high-resistance section I protection unit, a voltage-loss protection unit and the like; in addition, the auxiliary function module comprises a broken-line alarm unit, a fault ranging unit, a harmonic analysis unit, a load analysis unit, a self-checking unit, a fault recording unit and a GPS (Global Position System) time synchronizing unit; in addition, the measuring and controlling module comprises a remote metering unit, a remote signaling unit and a remote controlling unit; in addition, the locking module comprises an opening / closing locking unit and a locking reclosing unit; in addition, the communicating module comprises an RS485 interface, a selectable FDKBUS, an optical fiber FDKBUS and an Ethernet interface; in addition, a method for the four-section distance protection unit to recognize faults comprises the steps of: data preprocessing, network training and parameter generating, comprehensive judging and outputting.

Description

technical field [0001] The invention relates to the field of railway electrification, in particular to a protection method and device for a single-phase power frequency AC electrified railway traction substation, switching station, and partition kiosk feeder line. Background technique [0002] With the implementation of my country's medium and long-term railway network planning, my country's railway construction has ushered in a new round of peaks, especially high-speed railways have become the focus of railway construction. The safe operation of high-speed railways is inseparable from the protection of the traction power supply system, which can meet the needs of train operation when the power supply system is in normal operation, and can quickly remove the fault when the power supply system fails to ensure the personal safety of trains, equipment and passengers. Feeder line protection is an important unit of power supply system protection. Since the working conditions of t...

AI Technical Summary

Problems solved by technology

However, most of these devices have only one feeder protection current, which can only provide protection and distance measurement for one traction line. In the case of load wave recording and other situations, a complete judgment and protection method has not yet been formed; especially the quadrilateral characteristic distance protection as the main protection has some serious deficiencies in its performance: when the system oscillates, the distance protection may malfunction, and the transition The existence of the circuit may cause the distance protection to malfunction or refuse to operate, etc.

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