Protection scheme testing using a power system model

This paper describes a new method for testing relay schemes and relay panels. The new procedure is based on a power system model that is used to simulate different events selected according to the application. Events are played back through power system simulators that also monitor scheme performance. The advantages of the method are briefly discussed. The authors describe the method in more detail, and then describe the INSITE expert system to monitor the power system and the components in it to watch for changes in system operation