Multilin SR469 - 4.10 S9 VOLTAGE ELEMENTS

4. SETPOINT PROGRAMMING S9 VOLTAGE ELEMENTS
4-55
4.10.1 UNDERVOLTAGE
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FUNCTION:
The “U/V Active Only If Bus Energized” setpoint may be used to prevent nuisance alarms or trips when the bus is not energized. If ‘Yes’
is programmed for this setpoint, at least one voltage must be greater than 20% of the nominal nameplate voltage rating for any alarm or
trip. If the load is high inertia, it may be desirable to ensure that the motor is tripped off line or prevented from starting in the event of a
total loss of line voltage. Programming ‘No’ for the block setpoint will ensure that the motor is tripped and may be restarted only after the
bus is re-energized.
If the undervoltage alarm or trip feature is enabled, once the magnitude of either Va, Vb, or Vc falls below the Pickup Level while run-
ning or Starting Pickup Level while starting, for a period of time specified by the Delay, a trip or alarm will occur. (Pickup levels are mul-
tiples of motor nameplate voltage).
An undervoltage on running motor with a constant load will result in increased current. The relay thermal model will typically pickup this
condition and provide adequate protection. This setpoint may however, be used in conjunction with the time delay to provide additional
protection that may be programmed for advance warning by tripping.
Attempting to start a large motor when the supply voltage is already down may also be undesirable. An undervoltage of significant pro-
portions that persists while starting a motor may prevent the motor from coming up to rated speed. This may be especially critical for a
synchronous motor. This feature may be used in with a time delay to provide protection for undervoltage conditions before and during
starting.
4.10
S9
VOLTAGE
ELEMENTS