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In this work we analyzed the numerical relay 7SA612, which represents the basic protection of 220 kV overhead transmission lines starting from the Mintia electric station. The main function of 7SA612 relay is the distance protection; in addition, this relay offers a multitude of protection functions. We used the computer-controlled Omicron CMC 356 set for testing the 7SA612 relay at its mounting location. Test Universe, the software of CMC 356, allowed the simulation of all possible overhead transmission lines faults, in order to test the protection functions of 7SA612 relay. 7SA612 relay clears fast and selectively the faults on the analyzed 220 kV overhead transmission line. The tests showed that 7SA612 relay incorporates all the necessary functions for the protection of 220 kV overhead transmission lines, both in the case of single-phase and poly-phase faults.

Study about numerical relay 7SA612, the basic protection of 220 kV overhead transmission line