Date Code 20011026 Specifications 2-19
SEL-321/321-1 Instruction Manual
Table 2.4: Logic Input Assignment List
Function Label Application
Not Assigned NA Input not assigned
Setting Selection 1 SS1 Setting Group Selection Input 1
Setting Selection 2 SS2 Setting Group Selection Input 2
Setting Selection 3 SS3 Setting Group Selection Input 3
Permissive Trip PT Drive with PT receive output for POTT scheme
Block Trip BT Drive with BT receive output for DCB scheme
Direct Trip DT Asserts the DT element
Single-Pole Direct Trip A DTA Direct Trip A
Single-Pole Direct Trip B DTB Direct Trip B
Single-Pole Direct Trip C DTC Direct Trip C
Loss-of-Guard LOG Drive with loss-of-guard output from communica-
tions equipment
Potential Transfer PTXFR Drive with contact from the potential transfer
switch
Single-Pole Trip Enable SPTE Assert to enable single-pole trip
Parallel A-phase Block PARA Assert to block A-phase ground distance protection
Parallel B-phase Block PARB Assert to block B-phase ground distance protection
Parallel C-phase Block PARC Assert to block C-phase ground distance protection
Bkr. 1 Position 52A1 Drive with Bkr. 1 auxiliary in 3PT applications
1
Bkr. 2 Position 52A2 Drive with Bkr. 2 auxiliary in 3PT applications
2
Bkr. 1, A-phase Pole
Position
52AA1 Monitors Breaker 1 position, A-phase
Bkr. 2, A-phase Pole
Position
52AA2 Monitors Breaker 2 position, A-phase
Bkr. 1, B-phase Pole
Position
52AB1 Monitors Breaker 1 position, B-phase
Bkr. 2, B-phase Pole
Position
52AB2 Monitors Breaker 2 position, B-phase
Bkr. 1, C-phase Pole
Position
52AC1 Monitors Breaker 1 position, C-phase
Bkr. 2, C-phase Pole
Position
52AC2 Monitors Breaker 2 position, C-phase
Close CLOSE Drive with breaker close signal
Trip Coil Monitor 1 TCM1 Monitors Breaker 1 trip coil
3
Trip Coil Monitor 2 TCM2 Monitors Breaker 2 trip coil
4
Trip Coil Monitor,
A-phase 1
TCMA1 Monitors Breaker 1, A-phase trip coil
Trip Coil Monitor,
B-phase 1
TCMB1 Monitors Breaker 1, B-phase trip coil
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