Availability test method for self-healing channel of line longitudinal current differential protection

Abstract

The invention provides a self-healing device and a control method for acquiring the same receiving and transmitting path for a current differential protection channel. The device comprises an APS controller, a selection controller, a first delayer, a judgment device, a second delayer, a cross matrix disc, a line interface disc and a management interface disc. The input end of the second delayer is connected with one output end of the judgment device, one output end of the second delayer is connected with the input end of the line interface disc, the other output end of the second delayer is connected with one input end of the APS controller, the input end of the judgment device is connected with the output end of the cross matrix disc, the other output end of the judgment device is connected with the input end of the first delayer, the other input end of the APS controller is connected with the output end of the management interface disc, the output end of the APS controller is connected with one input end of the selection controller, the other input end of the selection controller is connected with the output end of the first delayer, and the output end of the selection controller is connected with the input end of the cross matrix disc. Receiving and transmitting path uniformity for line longitudinal current differential protection can be ensured through the device.

Description

technical field [0001] The invention relates to the technical field of inspection and testing, in particular to a method for inspecting the availability of self-healing channels of line longitudinal current differential protection. Background technique [0002] With the development of communication technology, optical fiber is more and more widely used in power system. Line longitudinal current differential protection has gradually become the power line protection in power grid because of its simple principle and is not affected by system oscillation, weak feed and other operation modes. main method of protection. Since the line longitudinal current differential protection adopts the synchronization method based on the data channel, the bidirectional consistency of the delay is the premise to ensure the sampling synchronization of the protection devices on both sides. If the sending and receiving paths of the channels are inconsistent, the differential protection will detec...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the special requirements of the line longitudinal current differential protection in the power grid, which requires the communication channel to send and receive paths to be consistent, and the addition and deletion of nodes in the self-healing ring network will not affect the operation of the existing line longitudinal current differential protection, a line longitudinal current differential protection is proposed. The reliability test method of the protection self-healing channel is to verify whether the consistency of the sending and receiving path of the channel can be realized and the specific scheme to ensure the reliability of the communication channel in the SDH optical fiber self-healing ring network shared by the two-fiber multiplexing section

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