4.26
SEL-387-0, -5, -6 Relay Instruction Manual Date Code 20170601
Control Logic
Relay Word Bits
6 50P21 Winding 2 phase definite-time O/C Level 1 element picked up
50P21T Winding 2 phase definite-time O/C Level 1 element timed out
50P22 Winding 2 phase instantaneous O/C Level 2 element picked up
51P2 Winding 2 phase inverse-time O/C element picked up
51P2T Winding 2 phase inverse-time O/C element timed out
51P2R Winding 2 phase inverse-time O/C 51P2 element is reset
PDEM2 Winding 2 phase demand current threshold exceeded
OCB O/C element B-phase selection
7 50A23 Winding 2 A-phase instantaneous O/C Level 3 element picked up
50B23 Winding 2 B-phase instantaneous O/C Level 3 element picked up
50C23 Winding 2 C-phase instantaneous O/C Level 3 element picked up
50P23 50A23 + 50B23 + 50C23
50A24 Winding 2 A-phase instantaneous O/C Level 4 element picked up
50B24 Winding 2 B-phase instantaneous O/C Level 4 element picked up
50C24 Winding 2 C-phase instantaneous O/C Level 4 element picked up
50P24 50A24 + 50B24 + 50C24
8 50N21 Winding 2 residual definite-time O/C Level 1 element picked up
50N21T Winding 2 residual definite-time O/C Level 1 element timed out
50N22 Winding 2 residual instantaneous O/C Level 2 element picked up
51N2 Winding 2 residual inverse-time O/C element picked up
51N2T Winding 2 residual inverse-time O/C element timed out
51N2R Winding 2 residual inverse-time O/C 51N2 element is reset
NDEM2 Winding 2 residual demand current threshold exceeded
OC2 Breaker 2 OPEN command execution
9 50Q21 Winding 2 neg.-seq. definite-time O/C Level 1 element picked up
50Q21T Winding 2 neg.-seq. definite-time O/C Level 1 element timed out
50Q22 Winding 2 neg.-seq. instantaneous O/C Level 2 element picked up
51Q2 Winding 2 neg.-seq. inverse-time O/C element picked up
51Q2T Winding 2 neg.-seq. inverse-time O/C element timed out
51Q2R Winding 2 neg.-seq. inverse-time O/C 51Q2 element is reset
QDEM2 Winding 2 neg.-seq. demand current threshold exceeded
CC2 Breaker 2 CLOSE command execution
10 50P31 Winding 3 phase definite-time O/C Level 1 element picked up
50P31T Winding 3 phase definite-time O/C Level 1 element timed out
50P32 Winding 3 phase instantaneous O/C Level 2 element picked up
51P3 Winding 3 phase inverse-time O/C element picked up
51P3T Winding 3 phase inverse-time O/C element timed out
51P3R Winding 3 phase inverse-time O/C 51P3 element is reset
PDEM3 Winding 3 phase demand current threshold exceeded
OCC O/C element C-phase selection
Table 4.10 Relay Word Bit Definitions (Sheet 2 of 12)
Row Bit Definition
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