GE Multilin 850

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4–212 850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL

PROTECTION CHAPTER 4: SETPOINTS

Figure 4-88: Phase Overvoltage logic diagram

894049A2.cdr

SETPOINTS

Phase A voltage (VA)

SETPOINT

FUNCTION:

Disabled

Trip

PICKUP:

AND

Phase B voltage (VB)

Phase C voltage (VC)

Operate Output Relay 1 (TRIP)

LED: TRIP

Alarm

Phase-to-Ground Voltages –

Wye connection

AND

Latched Alarm

AND

VA(VAB) > PICKUP

RUN

SETPOINTS

BLOCK :

Off = 0

LED: ALARM /

LATCHED ALARM

RESET

Command

AND

LATCH

Configurable

FlexLogic Operands

Phase OV 1 OP:

Phase OV 1 OP C:

Phase OV 1 OP B:

Phase OV 1 OP A:

Phase OV 1 PKP:

Phase OV 1 OP C:

Phase OV 1 OP B:

Phase OV 1 OP A:

SETPOINTS

MODE: Phase to Ground,

Phase to Phase (for wye

connection)

Phase to Phase (Delta

connection)

Ph-Ph AB voltage (VAB)

Ph-Ph BC voltage (VBC)

Ph-Ph CA voltage (VCA)

Phase-to-Phase Voltages –

Delta connection

VB(VBC) > PICKUP

RUN

VC(VCA) > PICKUP

RUN

SETPOINTS

PICKUP DELAY:

DROPOUT DELAY:

t PKP

t RST

t PKP

t RST

t PKP

t RST

SETPOINTS

OPERATE:

ANY ONE

ANY TWO

ALL THREE

PICKUP:

ANY ONE

ALL THREE

PHASES FOR

OPERATION:

ANY TWO

LED: PICKUP

MODE:

Ph-Ph AB voltage (VAB)

Ph-Ph BC voltage (VBC)

Ph-Ph CA voltage (VCA)

Calculated Phase-to-Phase

Voltages – Wye connection

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SETPOINTS

Do Not Operate, Operate

OUTPUT RELAYS 3 to 7

SETPOINTS

SIGNAL INPUT:

NAME( Ph VT Bnk1-J2

889 only

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