Supervision
The supervisions listed below are executed in a function-specific manner. If one of the monitors picks up, the
Health goes to alarm. The stage is indicated as Inactive. A closing release or direct close command is not
possible in this case.
•
For consistency of settings of specific parameters
Definite threshold-value settings are checked after a parameter change. If there is an inconsistency, the
error message Setting error is set.
•
For multiple selection of the stage at the start time of the synchronization
If there is a simultaneous selection of multiple closed synchronization stages at the start time, the error
message Multiple selection is set.
Measuring-Voltage Failure
If a voltage-transformer fault (measuring-voltage failure) is recorded via the binary input signal >Open of one
of the voltage-measuring points, then the closing commands of the synchronization stage are no longer
tested. In other words, a release of the closure based on the measurement is no longer possible. The readiness
of the stage turns to warning. Direct close command is still possible.
The device-internal supervision function measuring-voltage failure detection (Fuse Failure Monitor) does not
have any effect on the synchronization stage.
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 6-24
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
Control Functions
6.4 Synchronization Function
SIPROTEC 5, High-Voltage Bay Controller, Manual 367
C53000-G5040-C015-9, Edition 11.2017
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