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.
Are you sure about your differential current relay implementation?
Did you implement differential current relay correctly?
I'm not sure if I've done the right thing, instead of using CTs, I thought of using multimeters, i have done this with overcurrent relays and it works well. Thought of doing the same with differential current relays, i am using the RMS current and the corresponding phase measurement from the multimeters as my input to the differential current relay in PSCAD library. I am not sure if it is the correct implementation. How do you implement differential current relays using multimeters?
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