Overvoltage; Phase Reversal - GE 469 Instruction Manual

Note

5.10.2 Overvoltage

OVERVOLTAGE

5.10.3 Phase Reversal

PHASE
5–78
Set
UNDERVOLTAGE TRIP MODE
VOLTAGE SENSING ENABLE SINGLE VT OPERATION
balanced three phase system when fed from a single VT.
PATH: SETTINGS S9 VOLTAGE ELEM.
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If enabled, once the magnitude of either Vab, Vbc, or Vca rises above the pickup level for a
period of time specified by the delay, a trip or alarm will occur (pickup levels are multiples
of motor nameplate voltage).
An overvoltage on running motor with a constant load results in decreased current.
However, iron and copper losses increase, causing an increase in motor temperature. The
current overload relay will not pickup this condition and provide adequate protection.
Therefore, the overvoltage element may be useful for protecting the motor in the event of
a sustained overvoltage condition.
PATH: SETTINGS S9 VOLTAGE ELEM.
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to "3-Phase", when the settings
is set to "On". The relay assumes a
OVERVOLTAGE
OVERVOLTAGE
ALARM: Off
ASSIGN ALARM
RELAYS:
OVERVOLTAGE ALARM
PICKUP: 1.05 x
OVERVOLTAGE ALARM
DELAY: 3.0 s
OVERVOLTAGE ALARM
EVENTS: Off
OVERVOLTAGE
TRIP: Off
ASSIGN TRIP
RELAYS:
OVERVOLTAGE TRIP
PICKUP: 1.10 x
OVERVOLTAGE TRIP
DELAY: 3.0 s
PHASE REVERSAL
PHASE REVERSAL
TRIP: Off
ASSIGN TRIP
RELAYS:
469 MOTOR MANAGEMENT RELAY – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS
S2 SYSTEM SETUP
Range: Off, Latched, Unlatched
Range: Alarm, Alarm & Auxiliary2,
Alarm & Aux2 & Aux3, Alarm &
Auxiliary3, Auxiliary2, Aux2 &
Aux3, Auxiliary3
Range: 1.01 to 1.20 x RATED in steps of
0.01
Range: 0.5 to 60.0 s in steps of 0.1
Range: On, Off
Range: Off, Latched, Unlatched
Range: Trip, Trip & Auxiliary2, Trip &
Aux2 & Aux3, Trip & Auxiliary3
Range: 1.01 to 1.20 x RATED in steps of
0.01
Range: 0.5 to 60.0 s in steps of 0.1
Range: Off, Latched, Unlatched
Range: Trip, Trip & Auxiliary2, Trip &
Aux2 & Aux3, Trip & Auxiliary3