Functions
2.19 Synchronization Function
SIPROTEC, 7SJ62/64, Manual
C53000-G1140-C207-2, Release date 01.2008
315
Address 6x05 V< indicates the voltage threshold below which the feeder or the busbar can safely be considered
switched off (for checking a de-energized feeder or busbar).
Address 6x06 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 und-
ervoltage.
The setting for the mentioned voltage values is made in secondary volts. When using the PC and DIGSI for
configuration, these values can also be entered as primary values. Depending on the connection of the voltag-
es these are phase-to-ground voltages or phase-to-phase voltages.
Addresses 6x07 to 6x10 are set to specify the release conditions for the closing check. Where:
6x07 SYNC V1<V2> = Component V
1
must be de-energized, component V
2
must be energized (connection to
reference without voltage, dead line);
6x08 SYNC V1>V2< = component V
1
must be energized, component V
2
voltage value must be de-energized
(connection to feeder without voltage, dead bus);
6x09 SYNC V1<V2< = Component V
1
and Component V
2
must be de-energized (connection when reference
and feeder are de-energized, dead bus/dead bus);
6x10A Direct CO = Command is released without checks.
The possible release conditions are independent of each other and can be combined. It is obviously not rea-
sonable to combine Direct CO with other release conditions.
Parameter TSUP VOLTAGE (address 6x11A) can be set to configure a monitoring time which requires above
stated release conditions to be at least fulfilled for de-energized connection before switching is allowed. The
preset value of 0.1 s accounts for transient responses and can be applied without modification.
Release via synchronism check can be limited to a configurable synchronous monitoring time T-SYN.
DURATION (address 6x12). The configured conditions must be fulfilled within this time period. Otherwise,
release is not granted and the synchronization 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), the closing release under satisfied synchronism
conditions can be activated or deactivated in parameter 6x13A 25 Synchron.
Power System Data
The power system data for the synchronizing function are set at addresses 6x20 to 6x25.
The circuit breaker closing time T-CB close at address 6x20 is required if the device is to close also under
asynchronous system conditions, no matter whether for manual closing, for automatic reclosing after three-pole
tripping, or for both. The device will then calculate the time for the close command such that the voltages are
phase-synchronous the instant the breaker poles make contact. Please note that this should include the oper-
ating time of the breaker as well as the operating time of an auxiliary relay that may be connected in the closing
circuit.
The parameter Balancing V1/V2 (address 6x21) can be set to account for different VT ratios of the two parts
of the power system (see example in Figure 2-121).
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. (ad-
dress 6x22A) is used for that purpose.
The phase angle from V
1
to V
2
is evaluated positively.
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