GE Multilin 850

CHAPTER 4: SETPOINTS PROTECTION
850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 4–175
Figure 4-68: Negative Sequence Directional Overcurrent Protection logic diagram
AND
AND
AND
AND
850 Only
AND
SETTING
Off = 0
Block
SETTINGS Forward Pickup Positive-Sequence Restraint
TIMER
1.25 cycles
1.5 cycles
FLEXLOGIC OPERAND
NegSeq DirOC FWD
SETTING
Disabled = 0
Enabled = 1
Function
ACTUAL VALUES V_2 I_2
RUN
( |I_2| – K × |I_1| ) Pickup≥
Voltage Polarization
SETTINGS Forward ECA
RUN Forward Limit Angle Reverse Limit Angle
Forward
Reverse
SETTINGS Reverse Pickup RUN
( |I_2| – K × |I_1| ) Pickup≥
Pos Seq Restraint
FLEXLOGIC OPERAND
NegSeq DirOC REV
894204A1.cdr
TO NEG SEQ TOC AND IOC ELEMENTS
TO NEG SEQ TOC AND
IOC ELEMENTS
SETPOINTS SIGNAL INPUT
CT Bank 1 - J1