Name Values (Range) Unit Step Default Description
t1Min 0.000 - 60.000 s 0.001 5.000 Minimum operate time for inverse curves for
step 1
TD1 0.05 - 1.10 - 0.01 0.05 Time multiplier for the inverse time delay for
step 1
OperationStep2 Disabled
Enabled
- - Enabled Enable execution of step 2
OpMode2 1 out of 3
2 out of 3
3 out of 3
- - 1 out of 3 Number of phases required to operate (1 of 3,
2 of 3, 3 of 3) from step 2
Pickup2 1 - 100 %VB 1 50 Voltage start value (DT & IDMT) in % of
VBase for step 2
t2 0.000 - 60.000 s 0.001 5.000 Definie time delay of step 2
Table 68: UV2PTUV (27) Non group settings (basic)
Name Values (Range) Unit Step Default Description
GlobalBaseSel 1 - 6 - 1 1 Selection of one of the Global Base Value
groups
ConnType PhN DFT
PhN RMS
PhPh DFT
PhPh RMS
- - PhN DFT Group selector for connection type
8.1.6 Monitored data
Table 69: UV2PTUV (27) Monitored data
Name
Type Values (Range) Unit Description
V_A REAL - kV Voltage in phase A
V_B REAL - kV Voltage in phase B
V_C REAL - kV Voltage in phase C
8.1.7 Operation principle
Two-step undervoltage protection (UV2PTUV ,27) is used to detect low power system
voltage. UV2PTUV (27) has two voltage measuring steps with separate time delays. If
one, two or three phase voltages decrease below the set value, a corresponding
PICKUP signal is generated. UV2PTUV (27) can be set to PICKUP/TRIP based on 1
out of 3, 2 out of 3 or 3 out of 3 of the measured voltages, being below the set point. If
the voltage remains below the set value for a time period corresponding to the chosen
time delay, the corresponding trip signal is issued. The time delay characteristic is
1MRK 505 277-UUS C Section 8
Voltage protection
125
Technical Manual
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