6–170
350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
S6 MONITORING
CHAPTER 6: SETPOINTS
Figure 6-75: Current Demand logic diagram
LED
:PICKUP
Current Inputs
Phase
A Current
(IA
)
AND
SETPOINTS
FUNCTION
:
Disabled
Alarm
Latched
Alarm
OR
SETPOINTS
MEASUREMENT
TYPE
:
Calculate Phase
A
CURRENT
DEMAND
SETPOINTS
PICKUP
:
IA
Demand
≥
PICKUP
RUN
Current Dmd
1
PKP
AND
AND
Command
RESET
OR
LED
:ALARM
THERMAL
90
%
RESPONSE
TIME
:
TIME INTER
VA
L
:
Phase B Current
(IB
)
Calculate Phase B CURRENT
DEMAND
Phase C Current
(IC
)
Calculate Phase C CURRENT
DEMAND
IB Demand
≥
PICKUP
RUN
IC Demand
≥
PICKUP
RUN
OR
Current Dmd
1
PKP
A
Current Dmd
1
PKP
B
Current Dmd
1
PKP
C
FlexLogic Operands
S
LA
TCH
Set
-
Dominant R
SETPOINT
Do Not Operate, Operate
OUTPUT
RELA
Y X
SETPOINTS
BLOCK
1:
Of
f=
0
BLOCK
2:
Of
f=
0
BLOCK
3:
Of
f=
0
OR
898845A1.CDR