Transfer time measurement for protection relay applications with the IEC 61850 standard

This paper describes a practical method to verify the GOOSE performances of IEC 61850 protection relays. With reference to a breaker failure protection situation, one protection IED sends a direct intertrip command to another protection IED. The tests performed measure and compare the total operate time of the direct intertrip relay application implemented with GOOSE technology and with conventional technology. Measurements of the partial times in the system chain suggest an additional test method - compared to the so called ping pong time (or loop back time) - that could give IEC 61850 GOOSE information that more related to relay protection applications.