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)
