Functions
2.7 SYNCHROCHECK 25
SIPROTEC, 7RW80, Manual
C53000-G1140-C233-1, Release date 10.2010
97
Voltage Connections
The 7RW80 provides two voltage inputs for connecting the voltage V
1
and one voltage input for connecting the
voltage V
2
(see the following examples ).
If two phase-to-phase voltages are open delta-connected to side V
1
as reference voltage, a phase-to-phase
voltage must
be connected and configured for the additional voltage V
2
to be synchronized.
To correctly compare the phase-to-phase reference voltage V
1
with the additional voltage V
2
, the device needs
to know the connection type of voltage V
2
. That is the task of parameter CONNECTIONof V2 (parameter 6123).
For the device to perform the internal conversion to primary values, the primary rated transformer voltage of
the measured quantity V
2
must be entered via parameter 6125 VT Vn2, primary if a transformer is located
between the system parts to be synchronized.
Figure 2-26 Phase-to-phase voltage connection (open-delta connection)
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