4.28
SEL-387-0, -5, -6 Relay Instruction Manual Date Code 20170601
Control Logic
Relay Word Bits
16 50N41 Winding 4 residual definite-time O/C Level 1 element picked up
50N41T Winding 4 residual definite-time O/C Level 1 element timed out
50N42 Winding 4 residual instantaneous O/C Level 2 element picked up
51N4 Winding 4 residual inverse-time O/C element picked up
51N4T Winding 4 residual inverse-time O/C element timed out
51N4R Winding 4 residual inverse-time O/C 51N4 element is reset
NDEM4 Winding 4 residual demand current threshold exceeded
OC4 Breaker 4 OPEN command execution
17 50Q41 Winding 4 neg.-seq. definite-time O/C element picked up
50Q41T Winding 4 neg.-seq. definite-time O/C element timed out
50Q42 Winding 4 neg.-seq. instantaneous O/C Level 2 element picked up
51Q4 Winding 4 neg.-seq. inverse-time O/C element picked up
51Q4T Winding 4 neg.-seq. inverse-time O/C element timed out
51Q4R Winding 4 neg.-seq. inverse-time O/C 51Q4 element is reset
QDEM4 Winding 4 neg.-seq. demand current threshold exceeded
CC4 Breaker 4 CLOSE command execution
18 87U1 Unrestrained differential element 1 picked up
87U2 Unrestrained differential element 2 picked up
87U3 Unrestrained differential element 3 picked up
87U Unrestrained differential element picked up
87R1 Restrained differential element 1 picked up
87R2 Restrained differential element 2 picked up
87R3 Restrained differential element 3 picked up
87R Restrained differential element picked up
19 2HB1 Second-harmonic block asserted for differential element 1
2HB2 Second-harmonic block asserted for differential element 2
2HB3 Second-harmonic block asserted for differential element 3
5HB1 Fifth-harmonic block asserted for differential element 1
5HB2 Fifth-harmonic block asserted for differential element 2
5HB3 Fifth-harmonic block asserted for differential element 3
TH5 Fifth-harmonic alarm threshold exceeded
TH5T Fifth-harmonic alarm threshold exceeded for longer than TH5D
20 87BL1 Harmonic block asserted for differential element 1
87BL2 Harmonic block asserted for differential element 2
87BL3 Harmonic block asserted for differential element 3
87BL Harmonic block asserted for differential element
87E1 Trip by differential element 1
87E2 Trip by differential element 2
87E3 Trip by differential element 3
32IE Internal enable for the 32I element
Table 4.10 Relay Word Bit Definitions (Sheet 4 of 12)
Row Bit Definition
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