Phase And Residual Voltage Preprocessing Utvtr - ABB RELION REX640 Technical Manual

1MRS759142 F
3.17.3

Phase and residual voltage preprocessing UTVTR

3.17.3.1 Identification
Function description
Phase and residual voltage prepro-
cessing
3.17.3.2 Function block
Figure 90: Function block
3.17.3.3 Functionality
The phase and residual voltage preprocessing function UTVTR is used for setting up
the three phase voltage measurement channels and residual voltage measurement.
The input channels for UTVTR are either physical hardware or IEC 61850-9-2 sampled
value channels.
The output channel U3P of UTVTR can be connected to different applications which
require phase voltage, positive and negative sequence.
Outputs URES_MEAS and URES_CLC can be connected to different applications
which require measured residual voltage or calculated residual voltage (from phase
voltages), respectively.
The voltage transducer selection can be made by setting
"Voltage trafo" for conventional VT or to "Voltage sensor" for voltage sensor type.
REX640
Technical Manual
If only two phase-to-earth/phase-to-phase voltages are available, then
the third phase-to-earth/phase-to-phase voltage can be calculated
without URES input connected (assumed to be zero in that case).
Positive- and negative-sequence components are also calculated using
these voltages. The accuracy of the calculated phase-to-earth values is
affected if the actual residual voltage is not zero.
If an application function requires only the frequency value, output U3P of
UTVTR still needs to be connected since the frequency is calculated from
the voltage.
IEC 61850 IEC 60617
identification identification
UTVTR UTVTR
Basic functions
ANSI/IEEE C37.2
device number
UTVTR
Voltage input type to
197