Schweitzer Engineering Laboratories SEL-251D-1 Instruction Manual
Distridution relay; phase overcurrent relay with voltage control; negative-sequence overcurrent relay; ground overcurrent relay; multiple shot reclosing relay; selectable setting groups; circuit breaker monitor; fault locator; selogic control equations
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Summary of Contents for Schweitzer Engineering Laboratories SEL-251D-1
- Page 178 Using the SET command, enter NA for the ETC(1) and ITC(1) settings. These settings specify the overcurrent elements in Relay Word row R1 you want externally and internally torque controlled, respectively (none in this case). 7-14 Maintenance and Testing Date Code 940518 SEL-251D-1 Instruction Manual...
- Page 179 (none in this case). Set a programmable output (A1-A4) to follow a time-overcurrent element pickup (e.g., 51NP ). Use the assertion of this output (open to close) to start an external timer. Date Code 940518 Maintenance and Testing 7-15 SEL-251D-1 Instruction Manual...
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