GE 850 - Page 355

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CHAPTER 6: PROTECTION SETPOINTS VOLTAGE ELEMENTS

850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 6–87

Figure 6-35: Phase Undervoltage Protection logic diagram

894046A3.cdr

SETPOINTS

SETPOINT

FUNCTION:

Disabled

Trip

PICKUP:

AND

Operate Output Relay 1 (TRIP)

LED: PICKUP

LED: TRIP

Alarm

AND

Latched Alarm

AND

RUN

SETPOINTS

BLOCK :

Off = 0

LED: ALARM /

LATCHED ALARM

RESET

Command

AND

LATCH

Configurable

FlexLogic Operands

Phase UV1 OP:

Phase UV1 PKP:

Phase UV1 PKP C:

Phase UV1 PKP B:

Phase UV1 PKP A:

SETPOINTS

MODE: Phase to Ground,

Phase to Phase (for wye

connection)

Phase to Phase (Delta VTs)

RUN

PICK-UP DELAY:

UNDERVOLTAGE

CURVES:

VA(VAB ) < PICKUP

VB(VBC) < PICKUP

VC(VCA) < PICKUP

SETPOINTS

OPERATE:

ANY ONE

ANY TWO

ALL THREE

PHASES FOR

OPERATION:

PICK-UP:

ANY ONE

ANY TWO

ALL THREE

SETPOINTS

MINIMUM VOLTAGE:

VA(VAB) > MINIMUM

AND AND

VB(VBC) > MINIMUM

VC(VCA) > MINIMUM

AND

Phase UV1 OP C:

Phase UV1 OP B:

Phase UV1 OP A:

MODE:

}

{

}

Phase A voltage (VA)

Phase B voltage (VB)

Phase C voltage (VC)

Phase-to-Ground Voltages–

Wye connection

Ph-Ph AB voltage (VAB)

Ph-Ph BC voltage (VBC)

Ph-Ph CA voltage (VCA)

Phase-to-Phase Voltages–

Delta connection

Ph-Ph AB voltage (VAB)

Ph-Ph BC voltage (VBC)

Ph-Ph CA voltage (VCA)

Calculated Phase-to-Phase

Voltages – Wye connection

SETPOINTS

Do Not Operate, Operate

OUTPUT RELAYS3 to 7

NAME( Ph VT Bnk1-J2

889 only

SETPOINTS

SIGNAL INPUT:

GE 850 - Page 355

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