Double-sided jump protection system for DC traction power supply system based on optical fiber communication

Abstract

The invention discloses a double-side jumping protection system for a DC traction power supply system based on optical fiber communication. Corresponding to each of the traction substations, two DC traction protection monitoring and control devices and a large double-side jumping conversion relay (DSL1) are provided. And a photoelectric switching device (GD), through the photoelectric switching device to establish the optical fiber communication circuit between the DC traction protection measurement and control devices, no matter whether the traction substation in the catenary is in the normal operation state or in the cross-regional operation state, the present invention can It ensures that the fault information of the two feeders in any catenary interval can be exchanged reliably, improves the reliability of the double-side jump protection of the DC traction power supply system, and the invention has the advantages of strong anti-interference ability, good real-time performance and low cost. advantage.

Description

technical field [0001] The invention relates to a double-sided joint jump protection system for a DC traction power supply system based on optical fiber communication. Background technique [0002] When the urban rail transit DC traction power supply system is in normal operation, two DC power supplies in two adjacent substations are generally used to supply power to the same section. In this power supply mode, if a fault occurs in this section, the system needs to disconnect the DC feeder circuit breakers corresponding to two adjacent substations through double-sided joint trip protection, so as to completely isolate the fault in this section. When the DC traction power supply system provides cross-regional bilateral power supply, it is necessary to use the auxiliary contacts of the cross-regional isolation switch to realize the correct switching of the corresponding relationship between the DC feeders for the tripping of the bilateral joint trip protection. [0003] At pr...

AI Technical Summary

Problems solved by technology

[0004] First, based on the signal transmission method of the control cable, this method directly transmits the status of the relay between the two stations through the cable. Using this method, it is impossible to monitor the circuit in real time for disconnection or poor contact.

When there is disconnection or poor contact in the jump circuit, there may be problems of malfunction or refusal

[0005] Second, based on the signal transmission method of shielded twisted pair, this method first uses the device to collect the status of the relay, and then transmits the signal to the adjacent station through the twisted pair, and directly switches through the relay contact when realizing a large double-sided joint jump Communication loop, using this method mainly has the problems of poor anti-interference ability and limited communication distance

[0006] Third, the signal transmission method based on optical fiber. This method first uses the photoelectric conversion device to collect the state of the relay, and then transmits the signal to the adjacent station through the optical fiber. Using this method to achieve large double-sided joint jump, the design of the joint jump circuit is relatively complicated. Not easy to maintain

[0007] The above three methods all use a large number of relays to transmit signals, and the overall action time of the double-sided joint jump protection has a certain delay

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