SEL Test Procedure Negative-Sequence Volt-Pol Directional Overcurrent Element

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.

Angle References for SEL Test Procedure Negative-Sequence Volt-Pol Directional Overcurrent Element Relays

About the Author TechTalk Contributors

TechTalk contributors are readers who have taken the time to ask a question, or has joined the community by adding a post with this form. You can join the community too.

Leave a Comment:

Add Your Reply

Send this to a friend