Switching Synchronous Systems
Synchronous power systems are involved if galvanically coupled power systems are switched in parallel. A
typical characteristic for synchronous power systems is frequency identity (Δf ≈ 0). This state is detected if the
frequency difference undershoots the setting value of the parameter F SYNCHRON. If additionally conditions
Δα and ΔU are fulfilled over the set time 6146 T SYNC-DELAY, the closure command is issued. The associ-
ated logic diagram with the corresponding setting parameters is shown in Figure 2-14 for one of the both
channels. The sequence in the 2nd channel is identical to the 2-channels version of the 7VE63. The release
occurs here with positive result of all decisive criteria
Sync CloseRel 2
. First the release of both channels
allows a synchronization.
In the 1
1
/
2
-channel version of the 7VE61, the 1st channel represents a synchrocheck function. It opens a meas-
urement window in which a synchronization is permitted. Only if the release of the 2nd channel falls into this
measurement window, a synchronization is possible.
2.2.1.9
Functions
2.2 Paralleling Functions
SIPROTEC 4, 7VE61 and 7VE63, Manual 49
C53000-G1176-C163-3, Edition 10.2017
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