Sel SEL-421 - Page 584

R.A.14
SEL-421 Relay Reference Manual Date Code 20111215
Relay Word Bits
Alphabetic
OC1 Circuit Breaker 1 open command 87
OC2 Circuit Breaker 2 open command 87
OOSDET Out-of-step condition detected 19
OSB Out-of-step block 18
OSB1 Block Zone 1 during an out-of-step condition 17
OSB2 Block Zone 2 during an out-of-step condition 18
OSB3 Block Zone 3 during an out-of-step condition 18
OSB4 Block Zone 4 during an out-of-step condition 18
OSB5 Block Zone 5 during an out-of-step condition 18
OSBA A-phase out-of-step block 17
OSBB B-phase out-of-step block 17
OSBC C-phase out-of-step block 17
OST Out-of-step tripping 18
OSTI Incoming out-of-step tripping 18
OSTO Outgoing out-of-step tripping 18
OUT101–
OUT108
Main board outputs 218
OUT201–
OUT216
Optional I/O board 1 outputs 219 –220
OUT301–
OUT316
Optional I/O board 2 outputs 221–222
PB1–PB8 Pushbuttons 223
PB9–PB12 Pushbuttons 281
PB1_LED–
PB8_LED
Pushbutton LEDs 225
PB9_LED–
PB12LED
Pushbutton LEDs 282
PB1_PUL–
PB8_PUL
Pushbutton pulse inputs (on for one processing interval when
button is pushed)
224
PB9_PUL–
PB12PUL
Pushbutton pulse inputs (on for one processing interval when
button is pushed)
283
PB_CLSE Auxiliary CLOSE Pushbutton 281
PB_TRIP Auxiliary CLOSE Pushbutton 281
PCN01Q–
PCN32Q
Protection counter outputs 134–137
PCN01R–
PCN32R
Protection counter resets 138–141
PCT01Q–
PCT32Q
Protection conditioning timer outputs 120–121
PDEM Phase current demand picked up 86
PFRTEX Protection SEL
OGIC control equation first execution 194
PHASE_A Indicates an A-phase fault 228
PHASE_B Indicates a B-phase fault 228
PHASE_C Indicates a C-phase fault 228
Table A.1 Alphabetic List of Relay Word Bits (Sheet 14 of 21)
Name Description
Row