Hi, I am trying to simulate protection of distribution lines in a microgrid using differential current relays.
Hi I am trying to simulate the protection of distribution lines in a microgrid, using differential current relays. I have connected multimeters at both ends of the line. I am inputing the RMS current from the multimeters to the differential current relay. My problem is the relay is issuing a tripping signal without any differential current. What could I be missing? How is the current differential relay connected?
Attached is a capture showing Is_R3A and Is_R4B respective RMS currents from both ends of the line. The other capture2 attachment shows PH_R3A and PH_R4B which are the respective phases. Diff_OP is the output from the differential relay and Idiff is the difference between Is_R3A and Is_R4B. Kindly assist.