Siemens SIPROTEC 4 Manual page 268

Functions
2.20 Synchrocheck
Address 6101 Synchronizing allows you to switch the entire SYNC function group ON or OFF. If switched
off, the synchrocheck does not verify the synchronization conditions and release is not granted.
Parameter 6102 SyncCB is used to select the switchgear component to which the synchronization settings are
applied. Select the option none to use the function as external synchronizing feature. It will then be triggered
via binary input messages.
Addresses 6103 Vmin and 6104 Vmax set the upper and lower limits for the operating voltage range for V
V and thus determine the operating range for the synchronization function. Values outside this range will be
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signaled.
Address 6105 V< indicates the voltage threshold below which the feeder or the busbar can safely be consid-
ered switched off (for checking a de-energized feeder or busbar).
Address 6106 V> indicates the voltage threshold above which the feeder or busbar can safely be considered
energized (for checking an energized feeder or busbar). It must be set below the anticipated operational
undervoltage.
The setting for the mentioned voltage values is made in secondary volts. When using DIGSI for configuration,
these values can also be entered as primary values. Depending on the connection of the voltages these are
phase-to-earth voltages or phase-to-phase voltages.
Addresses 6107 to 6110 are set to specify the release conditions for the voltage check: Where
6107 SYNC V1<V2> = component V
when reference is de-energized, dead line);
6108 SYNC V1>V2< = component V
when feeder is de-energized, dead bus);
6109 SYNC V1<V2< = component V
ence and feeder are de-energized, dead bus / dead line);
6110 Direct CO = connection released without checks.
The possible release conditions are independent of each other and can be combined. It is not recommended to
combine Direct CO with other release conditions.
Parameter TSUP VOLTAGE (address 6111) can be set to configure a monitoring time which requires above
stated release conditions to be present for at least de-energized switching before connection is allowed. The
preset value of 0.1 s accounts for transient responses and can be applied without modification.
Release via synchrocheck can be limited to a configurable synchronous monitoring time SYN. DURATION
(address 6112). The configured conditions must be fulfilled within this time period. Otherwise release is not
granted and the synchronizing function is terminated. If this time is set to ∞, the conditions will be checked
until they are fulfilled.
For special applications (e.g. connecting a ground switch) parameter 6113 25 Synchron allows enabling/
disabling the connection release when the conditions for synchronism are satisfied.
Power System Data
The system related data for the synchronization function are set at addresses 6121 to 6125.
The parameter Balancing V1/V2 (address 6121) can be set to account for different VT ratios of the two
parts of the power system (see example in
If a transformer is located between the system parts to be synchronized, its vector group can be accounted for
by angle adjustment so that no external adjusting measures are required. Parameter ANGLE ADJUSTM.
(address 6122) is used to this end.
The phase angle from V
Example:
Busbar
Feeder
Transformer
The transformer vector group is defined from the high side to the low side. In the example, the reference
voltage transformers (V
to vector group), that is 150°:
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must be de-energized, component V
1
must be energized, component V
1
and component V
1
Figure 2-117).
to V is evaluated positively.
1 2
400 kV primary; 100 V secondary
220 kV primary; 110 V secondary
400 kV/220 kV; vector group Dy(n)5
) are the ones of the transformer high side, i.e. the setting angle is 5 x 30° (according
1
must be energized (connection
2
must be de-energized (connection
2
must both be de-energized (connection when refer-
2
E50417-G1140-C343-A8, Edition 12.2017
or
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SIPROTEC 4, 7SJ80, Manual