GE Multilin 850

4–166 850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
PROTECTION CHAPTER 4: SETPOINTS
Figure 4-64: SOTF 1 - Logic Diagram
894187A1.cdr
OR
AND
LED: ALARM
RESET
Command
AND
S R
LATCH
AND
SOTF OP
FlexLogic Operands
SOTF PKP
SETPOINT
Function: Disabled= 0 Latched Alarm
Alarm
OR
t
Pickup Delay: SOTF detection delay
SETPOINT
pkp
0
Dropout Delay: SOTF Detection Window
SETPOINT
0
t dpo
t
Dead Line Pickup Delay
SETPOINT
pkp
0
OR
Manual breaker closing command
FlexLogic Operands
SETPOINT
BLOCK: Off = 0
AND
SETPOINTS
SOTF Max Voltage
Va <
SETPOINTS
SOTF Current Pickup
Ia >
AND
BKR1 Open
FlexLogic Operands
OR
OR
SETPOINT
External SOTF Trigger Operand set = 1
Ib > Ic >
Vb < Vc <
AND AND
OR
SETPOINTS
Dead Line Max Current
Ia < Ib < Ic <
SETPOINTS
Dead Line Max Voltage
Va < Vb < Vc <
Trip
Configurable
AND
LED: TRIP
Operate Output Relay
SETPOINTS
VT input
Phase A Voltage (VA) Phase B Voltage (VB) Phase C Voltage (VC)
SETPOINTS
CT input
Phase A Current (IA) Phase B Current (IB) Phase C Current (IC)