Schweitzer Engineering Laboratories SEL-751 - Page 888

K.18
SEL-751 Relay Instruction Manual Date Code 20170927
Relay Word Bits
Definitions
OPTMN Open interval timer is timing
31
ORED50T Logical OR of all the instantaneous overcurrent elements tripped outputs
1
ORED51T Logical OR of all the time overcurrent elements tripped outputs
1
ORED81RT ORed frequency rate-of-change element
21
ORED81T ORed, over- and underfrequency element
21
OREDHIF1 HIF1_A or HIF1_B or HIF1_C
140
OREDHIF2 HIF2_A or HIF2_B or HIF2_C
140
OTHALRM Other temperature alarm. OTHALRM asserts when any healthy other RTD temperature
exceeds its alarm set point.
12
OTHTRIP Other temperature trip. OTHTRIP asserts when one or more healthy other RTD temperatures
exceed their trip set points.
12
OUT101–OUT103 Control equation for contact outputs OUT101–OUT103
21
OUT301–OUT308 Control equation for contact outputs OUT301–OUT308 (available only with optional I/O
module)
22
OUT401–OUT408 Control equation for contact outputs OUT401–OUT408 (available only with optional I/O
module)
23
OUT501–OUT508 Control equation for contact outputs OUT501–OUT508 (available only with optional I/O
module)
24
P1DIR Directional control for elements 67P1P, 51P1P, and 51P2P
129
P2DIR Directional control for element 67P2P
129
P3DIR Directional control for element 67P3P
129
P4DIR Directional control for element 67P4P
129
PASEL Ethernet Port A is active
31
PB01–PB08 Front-panel pushbutton 1–8 bit (asserted when PB01–PB08 is pressed)
15
PB01_PUL–PB08_PUL Front-panel pushbutton 1–8 pulse bit (asserted for one processing interval when PB01–PB08
is pressed)
16
PB1A_LED–
PB4A_LED
SEL
OGIC control equation: drives LED PB1A–LED PB4A
36
PB1B_LED–PB4B_LED SEL
OGIC control equation: drives LED PB1B–LED PB4B
36
PB5A_LED–
PB8A_LED
SELOGIC control equation: drives LED PB5A–LED PB8A
37
PB5B_LED–PB8B_LED SEL
OGIC control equation: drives LED PB5B–LED PB8B
37
PBSEL Ethernet Port B is active
31
PHASE_A A-phase involved in the fault (pulse for (LER – PRE – 0.75) cycles)
131
PHASE_B B-phase involved in the fault (pulse for (LER – PRE – 0.75) cycles)
131
PHASE_C C-phase involved in the fault (pulse for (LER – PRE – 0.75) cycles)
131
PHDEM C-phase current demand pickup
113
PMDOK Assert if data acquisition system is operating correctly
13
PMTRIG Trigger for synchrophasors
33
Table K.2 Relay Word Bit Definitions for the SEL-751 Relay (Sheet 13 of 17)
Bit Definition Row