CHAPTER 4: SETPOINTS CONTROL
850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 4–321
TARGETS
Range: Disabled, Self-Reset, Latched
Default: Self-Reset
Selecting the Disabled setting disables the targets of Pole Discordance function. In Self-
Reset mode, the targets remain active until the function drops out. In Latched mode, the
target maintains the set state until deactivated by a reset command.
Figure 4-143: Pole Discordance detection - main logic (A)
894182A1.cdr
Pickup Delay
SETPOINTS
pkp
t
AND
SETPOINT
BLOCK
Off = 0
LED: TRIP
OR
OR
AND AND
SETPOINT
FUNCTION:
Disabled = 0
Trip
Alarm
Latched Alarm
LED: ALARM
RESET
Command
AND
S
R
LATCH
Configurable
Set
Dominant
SETPOINTS
Do Not Operate, Operate
OUTPUT RELAY 1(X), excluding
trip selected outputs
To output relay selected to trip
the breaker
FLEXLOGIC OPERAND
Pole Discord 1 OP
SETPOINT
BKR Close Triggerl
FlexLogic Operand, Off=0
SETPOINT
External Pole Discordance
FlexLogic Operand, Off=0
SETPOINT
BRK Trip Trigger
FlexLogic Operand, Off=0
Contact based
PD detection
logic
RUN
SETPOINT
Contacts Based Detection
Disable, Enable = 1
Disable, Enabled
Current based
PD detection
logic
RUN
AND AND
SETPOINT
Currents Based Detection
Ph A pole (52 a contact )
Ph B pole (52a contact )
Ph C pole (52a contact)
Ph A pole (52 b contact )
Ph B pole (52b contact )
Ph C pole (52b contact)
Phase Currents
Phase A current
Phase B current
Phase C current
AND
AND
AND
FLEXLOGIC OPERAND
Contact PD1 OP
FLEXLOGIC OPERAND
Current PD1 OP
CT Bank 1-J1, CT Bank 2-
K1,…...
SETPOINT
Signal Input
850-D with multiple CT banks
Timer
t
=
pkp
t
+ 300ms
Timer
t
=
pkp
t
+ 300ms
OR
FLEXLOGIC OPERAND
External PD1 OP
AND
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