Name
Values (Range)
Unit
Step
Default
Description
CCrv2
0.0 - 1.0
-
0.1
0.0
Parameter C for customer programmable
curve for step 2
DCrv2
0.000 - 60.000
-
0.001
0.000
Parameter D for customer programmable
curve for step 2
PCrv2
0.000 - 3.000
-
0.001
1.000
Parameter P for customer programmable
curve for step 2
CrvSat2
0 - 100
%
1
0
Tuning param for prog. over voltage IDMT
curve, step 2
Table 274:
OV2PTOV Non group settings (basic)
Name
Values (Range)
Unit
Step
Default
Description
ConnType
PhN DFT
PhPh DFT
PhN RMS
PhPh RMS
-
-
PhN DFT
Group selector for connection type
GlobalBaseSel
1 - 12
-
1
1
Selection of one of the Global Base Value
groups
9.2.6
Monitored data
Table 275:
OV2PTOV 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
9.2.7
Operation principle
Two step overvoltage protection OV2PTOV is used to detect high power system
voltage. OV2PTOV has two steps with separate time delays. If one-, two- or three-
phase voltages increase above the set value, a corresponding START signal is issued.
OV2PTOV 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 above the set point. If the voltage remains above the set
value for a time period corresponding to the chosen time delay, the corresponding trip
signal is issued.
The time delay characteristic is individually chosen for the two steps and can be either,
definite time delay or inverse time delay.
The voltage related settings are made in percent of the global set base voltage
UBase
,
which is set in kV, phase-to-phase.
OV2PTOV can be set to measure phase-to-earth fundamental value, phase-to-phase
fundamental value, phase-to-earth RMS value or phase-to-phase RMS value. The
choice of measuring is done by the parameter
ConnType
.
1MRK502052-UEN B
Section 9
Voltage protection
495
Technical manual
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