Siemens 6MD85, Manual

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Figure 6-58 Structure/Embedding of the Function
Connection and Definition
Connection
You can find examples for the synchronization of line and busbar in the following 2 figures. Figure 6-61 shows
an example for the synchronization of 2 busbars via bus coupler.
The synchronization function uses 2 voltages to check the connecting conditions: a voltage of the reference
side 1 (V1) as well as a voltage to be used as a reference on side 2 (V2). The reference voltage of side 1 is
designated in the synchronization function as V1
21 . This is always the voltage of the measuring point that is
connected to the Sync. voltage 1 interface of the Circuit-breaker function group. The voltage to be set as
reference is designated with V2
21 . This is always the voltage of the measuring point that is connected to the
Sync. voltage 2 interface of the Circuit-breaker function group. The assignment of the measuring points to
the interfaces of the Circuit-breaker function group can be configured, see chapter
2.1 Function Embedding
in the Device .
The selection of the voltages used for the synchronization depends on the device connection to the primary
system:
•
Connection of the primary system via 4 voltage inputs and hence use of a 1-phase and a 3-phase meas-
uring point (
Figure 6-59 and Figure 6-61 ):
The voltage connected to the 1-phase measuring point is definitive here. If. for example, this is the
phase-to-ground voltage V
A
, the voltage V
A
is also used by the other side of the 3-phase measuring point.
•
Connection of the primary system via 6 voltage inputs and hence use of two 3-phase measuring points
(
Figure 6-60 ):
The phase-to-phase voltage V
AB
of both sides is always used for the test.
You can connect both the phase-to-ground voltages and the phase-to-phase voltages to the device. The
possible interface connections are listed in the Appendix.
6.4.3
21 Do not confuse the designations V1 and V2 with the numbering of the voltage inputs V1 to V4 ( Figure 6-59 ) and V1 to V8
( Figure 6-60 ).
Control Functions
6.4 Synchronization Function
SIPROTEC 5, High-Voltage Bay Controller, Manual 361
C53000-G5040-C015-9, Edition 11.2017