GE 845 - Page 229

CHAPTER 4: SETPOINTS SYSTEM
845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL 4–101
Figure 4-28: Transformer Status Detection Logic Diagram
894009A2.cdr
AND
SETPOINT METERING
W1/2/3 PHASE CURRENTS W1 Ia W1 Ic W1 Ib W2 Ia W2 Ic W2 Ib W3 Ia W3 Ic W3 Ib
MINIMUM CURRENT W1 Ia < Minimum W1 Ic < Minimum W1 Ib < Minimum W2 Ia < Minimum W2 Ic < Minimum W2 Ib < Minimum W3 Ia < Minimum W3 Ic < Minimum W3 Ib < Minimum
METERING PHASE VOLTAGE (J2) Vab Vca Vbc
SETPOINT
MINIMUM VOLTAGE V < Minimum V < Minimum V < Minimum
AND
OR
SENSING BY BREAKERS OPEN
FlexLogic Operand
XFMR De-Energized
FlexLogic Operand
XFMR Energized
ANDAND
ALL BREAKERS OPEN
AND
Disabled = 0 Enabled =1
SETPOINT
SENSING BY VOLTAGE Disabled = 0, Enabled = 1
RUN
SETPOINT
CURRENT SUPERVISION
RUN
SETPOINT
Disabled = 0, Enabled = 1
AND AND
LED: DE-ENERGIZED
SETPOINT
FlexLogic operand
FlexLogic Operand
Not Configured
NO R
AND
PKP
t = 50ms