A PSCAD/EMTDC based simulation study of protective relay

Based on PSCAD/EMTDC, the modeling and simulation of an actual protective relay has been studied and developed. To simulate an actual SEL321 relay, the function elements of SEL321 relay have been modeled. With the relay components library and the logic circuits library available in PSCAD/EMTDC, a relatively complete relay model and simulation of an actual SEL321 relay has been established. Both the relay model and real SEL321 relay have been tested with the same fault cases. The results show the feasibility and effectiveness of modeling and simulating a real protective relay with PSCAD/EMTDC.