Typical markings of an open-delta U
0
transformer in a 20 kV network can be: 20kV/
sqrt(3) :100V/sqrt(3) :100V/3. In case of a solid earth fault, this transformer gives
100 V output which corresponds to 11.547 kV. If ULTVTR primary voltage is set to 20
kV and RESTVTR primary voltage is set to 11.547 kV when this transformer is used,
URES_CLC and URES_MEAS output equal amplitude.
UTVTR1
O:11|T:2,5|I:1
UL1
UL2
UL3
MINCB_OPEN
URES
ALARM
WARNING
URES_ALARM
URES_WARNING
U3P
URES_CLC
URES_MEAS
URES_CLC_DR
URES_MEAS_DR
U1_DR
U2_DR
U3_DR
NPS_DR
PPS_DR
FREQ_DR
Slot F (AIM).X1-1;2_VT1
Slot F (AIM).X1-3;4_VT2
Slot F (AIM).X1-5;6_VT3
Slot F (AIM).X1-7;8_VT4
UTVTR1[1]_U3P
UTVTR1[1]_URES_CLC
UTVTR1[1]_URES_MEAS
Figure 91: UTVTR1 configured with both measured and calculated U0
The VT connection mode must be "WYE".
In this case, ROVPTOV1 and ROVPTOV2 in
Figure 92
can both use the same U
0
reference level in their settings. URES_CLC and URES_MEAS in
Figure 91
are scaled to
the same level.
ROVPTOV1
O:12|T:5|I:1
URES
BLOCK
OPERATE
START
ROVPTOV2
O:13|T:5|I:2
URES
BLOCK
OPERATE
START
UTVTR1[1]_URES_CLC
UTVTR1[1]_URES_MEAS
ROVPTOV1[1]_OPERATE
ROVPTOV2[2]_OPERATE
Figure 92: Two ROVPTOV instances, one using calculated U0 and the other
measured U0
3.17.3.5 Signals
UTVTR Input signals
Table 129: UTVTR Input signals
Name
Type Default Description
UL1 SIGNAL - Analog input
UL2 SIGNAL - Analog input
UL3 SIGNAL - Analog input
URES SIGNAL - Residual voltage
MINCB_OPEN BOOLEAN 0=False Active when external
MCB opens protected
voltage circuit
Basic functions 1MRS759142 F
200 REX640
Technical Manual
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