Method for realizing digital selective tripping protection by transmitting GOOSE signals through differential optical fibers

Abstract

The invention provides a differential optical fiber transmission GOOSE signal digital selective tripping protection method. A-group outgoing line cabinets of a first traction substation transmit overcurrent starting GOOSE signals to B-group outgoing line cabinets through a first switch, then the signals are transmitted to B-group incoming cabinets of a second traction substation on the opposite side, the B-group incoming cabinets send overcurrent starting GOOSE signals to A-group incoming cabinets of the second traction substation through a second switch, and a problem that a differential protection optical fiber channel and a digital communication overcurrent protection optical fiber channel cannot be shared is effectively solved, the communication network has main and backup protection redundancy and self-healing capability, interval communication optical cables are reduced, and interval protection communication channel construction cost and the construction and maintenance workloadare greatly reduced; the defect that main protection and backup protection of the incoming and outgoing line intervals fail at the same time due to interruption of interval differential optical fibercommunication is overcome, and reliability and safety of interval protection of the power supply system are enhanced.

Description

Technical field [0001] The invention relates to the field of voltage ring network power supply systems in urban rail transit, and in particular to a method for implementing digital selective jump protection by differential optical fiber transmission of GOOSE signals. Background technique [0002] In the urban rail transit medium-voltage ring network power supply system, for interval protection, the traditional relay protection scheme uses differential optical fiber to transmit interval fault signals to realize interval line differential protection. This scheme has no backup protection and has extremely high requirements on the reliability of the differential main protection. At the same time, affected by factors such as channel stability and external interference, it is easy to cause the relay protection device to malfunction. [0003] At present, the main solution for the interval protection of the urban rail transit power supply system is to establish an inter-station protection...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method for differential optical fiber transmission of GOOSE signals to realize digital jump protection, so as to solve the above-mentioned series of problems existing in the section protection of the existing power supply system

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