Schweitzer Engineering Laboratories SEL-751 - Page 878

K.8
SEL-751 Relay Instruction Manual Date Code 20170927
Relay Word Bits
Definitions
50PDIR Three-phase overcurrent threshold exceeded
129
50Q1P Level 1 negative-sequence instantaneous overcurrent element pickup
2
50Q1T Level 1 negative-sequence instantaneous overcurrent element trip
3
50Q2P Level 2 negative-sequence instantaneous overcurrent element pickup
2
50Q2T Level 2 negative-sequence instantaneous overcurrent element trip
3
50Q3P Level 3 negative-sequence instantaneous overcurrent element pickup
2
50Q3T Level 3 negative-sequence instantaneous overcurrent element trip
3
50Q4P Level 4 negative-sequence instantaneous overcurrent element pickup
2
50Q4T Level 4 negative-sequence instantaneous overcurrent element trip
3
50QF Forward direction negative-sequence overcurrent threshold exceeded
125
50QR Reverse direction negative-sequence overcurrent threshold exceeded
125
51AP A-phase time-overcurrent element pickup
6
51AR A-phase time-overcurrent element reset
8
51AT A-phase time-overcurrent element trip
7
51BP B-phase time-overcurrent element pickup
6
51BR B-phase time-overcurrent element reset
8
51BT B-phase time-overcurrent element trip
7
51CP C-phase time-overcurrent element pickup
6
51CR C-phase time-overcurrent element reset
8
51CT C-phase time-overcurrent element trip
7
51G1P Level 1 residual-ground time-overcurrent element pickup
9
51G1R Level 1 residual-ground time-overcurrent element reset
9
51G1T Level 1 residual-ground time-overcurrent element trip
9
51G2P Level 2 residual-ground time-overcurrent element pickup
9
51G2R Level 2 residual-ground time-overcurrent element reset
9
51G2T Level 2 residual-ground time-overcurrent element trip
9
51N1P Level 1 neutral-ground time-overcurrent element pickup
6
51N1R Level 1 neutral-ground time-overcurrent element reset
8
51N1T Level 1 neutral-ground time-overcurrent element trip
7
51N2P Level 2 neutral-ground time-overcurrent element pickup
6
51N2R Level 2 neutral-ground time-overcurrent element reset
8
51N2T Level 2 neutral-ground time-overcurrent element trip
7
51P1P Level 1 maximum phase time-overcurrent element pickup
6
51P1R Level 1 maximum phase time-overcurrent element reset
8
Table K.2 Relay Word Bit Definitions for the SEL-751 Relay (Sheet 3 of 17)
Bit Definition Row