A Distributed Protection System for Segmented Power Supply of Electrified Railway Traction Network

Abstract

The invention discloses a segmented power supply distributed protection system for electrified railway traction network, which corresponds to the section of the railway, divides the catenary in the electrified railway traction network into several segments, and adds a segmenter and a switch at the segment. Closing station; switching station includes circuit breaker, current transformer, voltage transformer and measurement and control unit; the circuit breaker is usually in the closed state; the secondary side of the voltage transformer, the secondary side of the current transformer, and the left adjacent switching station of the switching station The secondary side of the current transformer and the secondary side of the current transformer of the right adjacent switching station are connected to the input terminal of the measurement and control unit, and the output terminal of the measurement and control unit is connected to the circuit breaker control terminal of the switching station; each measurement and control unit communicates with the traction substation through the transmission network Or dispatching room connected. The invention constitutes a segmented distributed protection method of the traction network. Compared with the centralized protection method, its real-time performance is not affected by the number of segments of the traction network. The related devices involved in the invention have less investment and are easy to implement, which is convenient for the adoption of new lines and the transformation of old lines.

Description

technical field [0001] The invention belongs to the technical field of AC electrified railway traction network protection, and in particular relates to a segmental power supply protection method and device for electrified railway traction network. Background technique [0002] The traction power supply system of electrified railway is composed of traction substation and traction network. The traction network of the direct power supply method is composed of catenary, track and ground. In order to improve the power supply capacity of the traction network, reduce the power supply voltage and energy loss, and maintain the relative independence of the uplink and downlink catenary, the uplink and downlink catenary are usually connected in parallel at the end of the double-track railway traction network (division office). However, when a fault occurs in the upper (lower) catenary, the upper (lower) feeder and the partition substation of the traction substation will be tripped, so ...

AI Technical Summary

Problems solved by technology

Since the current traction substations are connected to the power system with commutation phases and use out-of-phase power supply, the traction network is not connected to each other and the number of segments is small. This method is convenient and effective; but when the same-phase power supply is implemented, the traction network will be connected. The number of segments is greatly increased, and the real-time performance of synchronous data acquisition and transmission and centralized processing of fault information becomes difficult or even impossible, which will greatly affect the practicability of the method

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