CHAPTER 6: SETPOINTS
S3 PROTECTION
350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
6–107
POS SEQ UV FUNCTION
Range: Disabled, Alarm, Latched Alarm, Trip
Default: Disabled
For details see
POS SEQ UV PKP
Range: 0.00 to 1.25 x VT in steps of 0,01
Default: 0.75 x VT
This setting defines the positive sequence UV pickup level.
POS SEQ 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
positive sequence undervoltage operation based on selected UV time delay, and the
actual undervoltage condition with respect to the selected UV pickup.
POS SEQ 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 before UV operation, when Definite Time is selected
under the POS SEQ UV CURVE setting.
POS SEQ 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.
NOTE
NOTE:
The minimum voltage setting follows a different criteria from the pickup setting. The pickup
setting accounts for the rated VT secondary value connection being either WYE or DELTA
depending on the connection setting, however, the minimum voltage setting assumes the
rated VT secondary value connection is WYE. As a result, when the connection is instead
DELTA, the user must set the Min Voltage value SQRT(3) times higher than expected in order
to compensate.
OUTPUT RELAY X
For details see
BLOCK 1/2/3
For details see
