to be synchronized. If the connections U
sy1
and U
sy2
differ with regard to the phase angle, parameter 214 φ
Usy2-Usy1 is to be set to adjust the angle.
Connection, multiple-phase
If the phase-to-earth voltages are connected to all three phases, parameter 106 is set to VT CONNECTION =
3phase during configuration. The following figure shows a connection example. In this example, the phase-
to-earth voltage U
L1–E
is the voltage to be synchronized. Accordingly for the parameter 212 Usy2 connec-
tion = L1-E must be selected, so that corresponding voltages will be compared.
[sync-dreiphasenanschluss-l-e-131102-kn, 1, en_GB]
Figure 2-23 Example of a three-phase phase-to-earth connection
Connection, single-phase
If only a single-phase voltage is available as reference voltage U
sy1
, parameter 106 is set to VT CONNECTION =
1phase during configuration. If this type of connection is used, the reference voltage U
sy1
must always be
connected to the voltage input U
L1
of the 7VK61, regardless of the phase actually used at the primary voltage
transformer. In this case, parameter 212 will be hidden since only two voltages are available. As the example
in the following figure shows, the reference voltage U
sy1
does not necessarily have to assume the same phase
angle as the voltage U
sy2
to be synchronized. The reference voltage on primary side is UL2–E, the voltage to be
synchronized on primary side is UL3–E. The necessary phase-angle adjustment is here accomplished via
parameter 214 φ Usy2-Usy1. Should also the amplitudes of the two voltages differ from each other, param-
eter 215 Usy1/Usy2 ratio can be set to adjust them.
Functions
2.4 Synchronism and voltage check (optional)
SIPROTEC 4, 7VK61, Manual 93
C53000-G1176-C159-5, Edition 05.2018
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