[sync-einschaltlogik-220403-oz, 1, en_GB]
Figure 2-18
Logic for CLOSE command energization
Automatic Synchronizing of Generators
General
For devices variants with balancing commands 7VE6**-*****-*C or D** fully automatic synchronising of the
generator with the power system is possible. If the synchronizing conditions are not fulfilled the device auto-
matically outputs actuator signals. The actuator signals are proportional to the voltage or frequency difference
i.e. with greater differences longer actuator commands are issued. Generator voltage and speed are influ-
enced by the particular controllers so that fast connection is made possible.
By means of the balancing commands of the 7VE6 to the speed controller of the drive machine, generator
frequency is brought quickly to the parallel connection point. At the same time the generator voltage is
matched to the power system voltage by actuator commands to the voltage controller of the generator or to
the taps changer of the transformer. On parametrization of the device it is possible to establish whether
parallel connection is to be done only in the oversynchronous or undersynchronous state, or in both states.
If both sides have exactly the same frequency but different phase angles, no synchronisation is possible. In
such a case the 7VE6 causes a small change of frequency and thus a gradual change of phase angle by means
of a short actuator pulse (“Kick impulse”).
Control Variables
The controller changes its setpoint values by actuator pulses, in accordance with their pulse length. To adapt
to the dynamics of the controller and the generator, voltage change
dU2 / dt
and frequency change
df2 /
dt
as well as minimum and maximum pulse lengths can be adjusted. If the setpoint is adjusted by the pulse,
the controller requires some time to adapt the controller variables to the new setpoint. To dampen state
2.2.1.12
Functions
2.2 Paralleling Functions
54
SIPROTEC 4, 7VE61 and 7VE63, Manual
C53000-G1176-C163-3, Edition 10.2017
Summary of Contents for SIPROTEC 4 7VE61
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