This paper describes the use of a real time digital simulator with dynamic machine models to validate out-of-step tripping and blocking elements in a new protective relaying system being installed on the BC Hydro 500 kV power system. The technique has also been used to study and validate a generation
shedding remedial action scheme. This unique approach has many advantages over traditional methods of studying the effect of power swings on protection systems. Traditional methods for studying power swings are limited in their ability to predict the response of protective elements due to the fact that they model the power system in the positive-sequence network only. A real time digital simulator can represent the power system under more realistic conditions so that the response of the protective system can be tested under conditions that nearly match actual field conditions. Case studies are discussed in the paper showing the importance of this new approach.
F. Plumptre, S. Brettschneider, A. Hiebert, M. Thompson, M. Mynam, Presented at the
33rd Annual Western Protective Relay Conference, October 2006