Steady State Simulation of Power Systems with Change in Topology

In power system protection, the need to know the load current together with the fault level detected by a relay is important. This is due to the fact that the relay is required to isolate the equipment being protected if a fault is present and keep the breaker associated with it closed if the current level is lower than the maximum load level. This is not an issue for a radial system. This is not the same however in a looped power system. In a looped power system, the isolation of an equipment system will contribute to a topology change. The change in the power system topology will then influence or change the maximum load current and the fault level detected by each relay. In this paper, a method of data collection for changing topology using Matlab and Sim-power will be presented. The method will take into consideration the change in topology and collect data for each possible topology. Keywords—Topology Change, Power System Protection, Power System simulation, Matlab, Sim-power.