6–74
350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
S3 PROTECTION
CHAPTER 6: SETPOINTS
PH UV PKP
Range: 0.00 to 1.25 x VT in steps of 0.01
Default: 0.75 x VT
This setting defines the phase UV pickup level, and it is usually set to a level, below which
the drawn current from voltage sensitive loads, such as induction motors may cause
dangerous motor overheating conditions.
PH UV CURVE
Range: Definite Time, Inverse Time
Default: Inverse Time
This setting selects the type of timing-inverse time/definite time to define the time of
undervoltage operation based on the selected UV time delay, and the actual
undervoltage condition with respect to the selected UV pickup.
PH UV DELAY
Range: 0.00 to 600.00 sec in steps of 0.01 sec
Default: 2.0 s
This setting specifies the time delay used by the selected “PHASE UV CURVE” type of
timing, to calculate the time before UV operation. When Inverse Time is selected, this
setting is used in the formula for Inverse Time operating time.
PH UV PHASES
Range: Any One, Any Two, All Three
Default: Any One
This setting selects the combination of undervoltage conditions with respect to the
number of phase voltages under the undervoltage pickup setting. Selection of the “Any
Two”, or “All Three” settings would effectively rule out the case of single VT fuse failure.
PH UV MIN VOLTAGE
Range: 0.00 to 1.25 x VT in steps of 0.01
Default: 0.30 x VT
The minimum operating voltage level is programmable to prevent undesired UV
operation before voltage becomes available.
OUTPUT RELAY X
For details see
BLOCK 1/2/3
For details see
