ABB RELION REX640, Техническое руководство, Страница: 197 / 1960

3.17.3 Phase and residual voltage preprocessing UTVTR
3.17.3.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Phase and residual voltage prepro-
cessing
UTVTR UTVTR UTVTR
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.
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.
The voltage transducer selection can be made by setting Voltage input type to
"Voltage trafo" for conventional VT or to "Voltage sensor" for voltage sensor type.
1MRS759142 F Basic functions
REX640
Technical Manual
197