Name Values (Range) Unit Step Default Description
OperationStep2 Off
On
- - On 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
U2< 1 - 100 %UB 1 50 Voltage start value (DT & IDMT) in % of
UBase for step 2
t2 0.000 - 60.000 s 0.001 5.000 Definie time delay of step 2
Table 114: UV2PTUV 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
7.1.6 Monitored data
Table 115: UV2PTUV Monitored data
Name
Type Values (Range) Unit Description
UL1 REAL - kV Voltage in phase L1
UL2 REAL - kV Voltage in phase L2
UL3 REAL - kV Voltage in phase L3
7.1.7 Operation principle
Two-step undervoltage protection (UV2PTUV) is used to detect low power system
voltage. UV2PTUV has two voltage measuring steps with separate time delays. If one,
two or three phase voltages decrease below the set value, a corresponding START
signal is generated. UV2PTUV can be set to START/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 settable for step
1 and can be either definite or inverse time delayed. Step 2 is always definite time
delayed.
UV2PTUV can be set to measure phase-to-earth fundamental value, phase-to-phase
fundamental value, phase-to-earth true RMS value or phase-to-phase true RMS value.
The choice of the measuring is done by the parameter ConnType. The voltage related
settings are made in percent of base voltage which is set in kV phase-to-phase voltage.
This means operation for phase-to-earth voltage under:
1MRK 511 287-UEN A Section 7
Voltage protection
159
Technical manual
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