On modeling and simulating the differential protection of power transformers in ATP

This paper aims to present the modeling and simulation of numerical differential protection of power transformers using the software ATP/ATPDraw and its MODELS environment. In order to validate the relay model, simulations were carried out using a simplified electrical power system whose parameters were obtained from a real system. The results reveal the advantages of using this type of modeling, since it provides a closed loop simulation, thereby one can evaluate the behavior of the power system against the protection operation, as well as the protection performance for the different power systems operational conditions.