Dynamic identification technology for the failure risk of the secondary virtual circuit of relay protection in an intelligent substation
The failure risk of the secondary virtual circuit of relay protection can cause hidden dangers to the protection function,affecting the safe and reliable operation of a relay protection system.To solve this problem,a dynamic identification technology for the virtual circuit failure risk is proposed,one which systematically gives alert to the virtual circuit failure risk and detects virtual circuit faults in time.First,by analyzing the virtual circuit object,and sorting out the explicit and implicit defects of the virtual circuit,a warning technical architecture of the failure risk is constructed.The key methods include the identification of secondary circuit link as well as functional faults.For the identification of secondary circuit link faults,using such techniques as device breakage alarm processing,port optical power analysis,and fiber loss evaluation,the ports are monitored,and using criteria the abnormal messages are monitored.For the identification of secondary circuit functional faults,protection functions on the tripping and closing circuits,the status of the maintenance plates,and the status of virtual circuit soft plates are monitored.Finally,through the use of an intelligent recorder,the feasibility of the techniques and the correctness of the methods are verified.The technology provides assistance for the intelligent operation and maintenance of relay protection in the failure risk of a virtual circuit,and has good practical value.
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