Research On Protection Model Based On Logic And Reasoning Methods

The funtion of the fault diagnosis system is to diagnose the fault device with the fault information. It can quickly and accurately analyze the fault, determine the fault type and offer treatment advice to help dispatchers quickly make reasonable operational decision.With the contant improvement of dispatching automation system, there have been more and more information for fault diagnosis. In the conditions of multiple data sources, fault diagnosis is not only to determine the fault equipment(exception), but also to analyze the entire process of fault, which is the target of the fault diagnosis.To deal with some shortcoming of the online fault diagnosis for the current system and rebuid the porcess of the fault, the paper develops a protection model based on logic for the fault diagnosis system by making using of the dual-source data from the SCADA system and the fault information system. The logical model designs a general knowledge representation method to describe the causal relationship between alarm information or intermediate conclusion. It sets up the network of causal relationship between secondary information from different data sources and realizes the six following functions including determining the scope of protection, determining the suspected faulty equipment, active data collection, a logical sequence of alarm information, tips of missing information, tips of non-operation information and the reason of it.Finally, the validity of logical protection model is verified by taking the power grid 110kV line fault as an example.