Function Measured Values
The function measured values for the Synchronization function are displayed in their own primary, secondary
and percentage measured-value windows. Voltage measurements are always displayed as ph-ph voltages,
even if the associated measuring point records phase-to-ground voltages. The function measured values are
determined and displayed as soon as the device is functional. The difference values are calculated as soon as
the stage is activated.
Table 8-24 Protection-Specific Values of the Synchronization
Values Primary Secon-
dary
% Referenced to
V
1
Reference voltage V
1
kV V Rated operating voltage of the
primary values
V
2
Voltage to be synchronized V
2
kV V Rated operating voltage of the
primary values
f
1
Frequency of the voltage V
1
Hz Hz Rated frequency
f
2
Frequency of the voltage V
2
Hz Hz Rated frequency
dV Voltage difference V
2
-V
1
kV V –
df Frequency difference f
2
-f
1
Hz Hz –
dα Angle difference α
2
-α
1
o
– –
Multiple Synchronization Points
The synchronization function can only be used within a Circuit-breaker function group. It always operates on
the circuit breaker that is linked to the Circuit-breaker function group. The reference to the circuit breaker is
therefore unique. If you wish to switch several circuit breakers (synchronization points) with the device, you
must create several Circuit-breaker function groups.
Different Synchronization Conditions per Synchronization Point
Within the synchronization function, you can operate maximum 2 stages of the stage type Synchrocheck and
maximum 6 stages of the type Synchronous/asynchronous in parallel. All setting parameters for a synchroni-
zation point are included in each synchronization stage.
If you have to synchronize with different synchronization conditions (parameter settings), several synchroniza-
tion stages are used for a synchronization point/circuit breaker. In this case, you must define which of the
synchronization stages is currently active via the binary signal >Selection (synchronization stage x). The
closing conditions are checked if the respective stage is activated via the >Selection binary signal and the
stage is activated.
The fault indication Multiple selection is issued upon simultaneous selection of different synchroniza-
tion stages. If several synchronization stages are activated and the input signal >Selection (synchronization
stage x) is missing at the starting time, a valid selection is awaited during the supervision time Max.durat.
sync.process. If this does not come, the process is terminated.
Different Voltage-Transformer Ratios of Both Parts of the Electrical Power System
The settings of the rated parameters of the transformer for the measuring points automatically takes the
different voltage-transformer transformation ratios of both parts of the electrical power system into account.
The Voltage adjustment parameter is not needed for this purpose.
Synchronization via a Transformer
There are systems in which a power transformer is located between the voltage measuring points of the circuit
breaker to be synchronized. The device automatically considers the different voltage stages by setting the
transformer ratios (within the measuring points).
A phase displacement must be taken into account based on the transformer vector group, via the Angle
adjust. (transform.) parameter.
Control Functions
8.4 Synchronization Function
1134 SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
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