A multiplexing fiber channel routing consistency identification method and differential protection device

Abstract

The present invention relates to a method for identifying route consistency of a multiplexed fiber channel and a differential protection device. It is judged whether two fiber channels are input and at least one of them is a multiplexed fiber channel. Normal selection of the reference fiber channel; the reference fiber channel completes the sampling synchronization of the local end and the peer end, and obtains the sampling time deviation of the reference fiber; the non-reference fiber channel is used as a virtual reference channel to complete the sampling synchronization of the local end and the peer end, and obtains the sampling time deviation of the non-reference fiber; By comparing the sampling time deviations of the two fiber channels, the consistency of the multiplexed fiber channel sending and receiving routes is judged. The present invention does not need to add additional channel equipment, and can realize real-time monitoring of the operating conditions of the multiplexed optical fiber channels used by the differential protection through software upgrades, and make real-time early warnings for the inconsistency of the sending and receiving routes of the multiplexed optical fiber channels, which can Effectively improve the reliability of optical fiber current differential protection.

Description

technical field [0001] The invention relates to the technical field of electric power relay protection, in particular to a multiplexing optical fiber channel routing consistency identification method and a differential protection device. Background technique [0002] As the channel medium of relay protection, optical fiber has the advantages of long transmission distance, low attenuation, large communication capacity and strong anti-interference ability, and has become the first choice of channel medium for current differential protection of power lines. [0003] For high-voltage optical fiber current differential protection, the power-on time of the protection devices at both ends is different and the deviation of the sampling crystal oscillator, plus the time delay for the sampling data at one end to be transmitted to the other end, therefore, the sampling time of the current at both ends is usually inconsistent and cannot be directly performed. differential calculation. ...

AI Technical Summary

Problems solved by technology

However, the use of long-distance, complex-structured SDH multiplexing channels improves the speed and sensitivity of line differential protection, and at the same time brings risks to the reliability of differential protection.

[0005] For dedicated fiber channels, the principle of synchronous adjustment based on the consistent sending and receiving routes of the channels has always been satisfied without being affected by the channels, but for multiplexing SDH fiber channels, in the actual operation process, other network structures are used except the two-fiber bidirectional multiplex section switching ring There will always be a risk of inconsistency in the transmission and reception delays of the channel. For this risk, the existing channel technology and equipment cannot be well resolved except for the optimization of the grid structure. The reliability of the longitudinal current differential protection of the structure has brought hidden dangers

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