RSVIES—a relay setting value identification expert system

This paper presents an expert system for relay setting value checking during the change of power system topology due to normal switching operations. With the help of this system, relay engineers can easily find incorrect relay setting values so that the proper coordination can be made. This expert system consists of a network parameter correction module, a fault calculation module, a graphic module, and a checking module. The main body of this expert system was coded with Prolog and the fault calculation module in Fortran so that a hybrid system was achieved. According to the tests on a 110 kV power system, this prototype can correctly check the relay setting values for the given power system so that it can be used as an efficient aid for relay engineers in power system dispatch centers.