Schweitzer Engineering Laboratories SEL-321 - Page 55

Date Code 20011026 Specifications 2-31
SEL-321/321-1 Instruction Manual
Element Comment
OSB4
OSB3
OSB2
OSB1
50PP4
50PP3
50PP2
50PP1
Out-of-Step Block, Zone 4
Out-of-Step Block, Zone 3
Out-of-Step Block, Zone 2
Out-of-Step Block, Zone 1
Phase-to-Phase Supervisory Overcurrent, Zone 4
Phase-to-Phase Supervisory Overcurrent, Zone 3
Phase-to-Phase Supervisory Overcurrent, Zone 2
Phase-to-Phase Supervisory Overcurrent, Zone 1
TS
TC
TB
TA
*
*
ILOP
50P
Trip Suspicion Condition
C-phase Trip
B-phase Trip
A-phase Trip
Reserved For Future Use
Reserved For Future Use
Internal Loss-of-Potential Condition
Single-Phase REJO Overcurrent Element
SPT_EN
*
*
*
*
52AC
52AB
52AA
SPTE asserted or ESPT = Y or Y1
Reserved For Future Use
Reserved For Future Use
Reserved For Future Use
Reserved For Future Use
Breaker(s) Auxiliary Contact Pole C
Breaker(s) Auxiliary Contact Pole B
Breaker(s) Auxiliary Contact Pole A
50AB4
50AB3
50AB2
50AB1
ATPC
ATPB
ATPA
50PPL
AB Overcurrent Supervision, Zone 4
AB Overcurrent Supervision, Zone 3
AB Overcurrent Supervision, Zone 2
AB Overcurrent Supervision, Zone 1
Assert Trip C
Assert Trip B
Assert Trip A
Current latch for DCB scheme after polarizing memory expires
50CA4
50CA3
50CA2
50CA1
50BC4
50BC3
50BC2
50BC1
CA Overcurrent Supervision, Zone 4
CA Overcurrent Supervision, Zone 3
CA Overcurrent Supervision, Zone 2
CA Overcurrent Supervision, Zone 1
BC Overcurrent Supervision, Zone 4
BC Overcurrent Supervision, Zone 3
BC Overcurrent Supervision, Zone 2
BC Overcurrent Supervision, Zone 1