I am writing to enquire about 67N test procedures, specifically Schweitzer relays. The Page 94 of the Relay Testing Handbook #C2 : Practical Relay Testing (50/51/67/59/27/81/87/21) by Chris Werstiuk says “some relays, such as SEL models, do not have user defined characteristics and operate dynamically based on actual operating condictions” I would be grateful if someone could send me further details regarding about the best way to test this function ( 67N-directional overcurrent ) in Schweitzer relays related with settings Z2R, Z2F (Negative-Sequence Voltage-Polarized Directional Element for Ground Distance and Residual Ground Overcurrent Elements).
Best Regards
adolf2012
This is the figure mentioned in the comments for page 611 to help describe the Directional Overcurrent Element phase angles in an SEL relay.
