2.14 Synchronism and voltage check (optional)
263
7SA522 Manual
C53000-G1176-C155-3
• Is the voltage difference |U
line
– U
bus
| within the permissible tolerance 0D[9ROW
'LII?
• Are the two frequencies f
bus
and f
line
within the permitted operating range f
N
± 3Hz?
• Does the frequency difference |f
line
– f
bus
| lie within the permissible tolerance 0D[
)UHT'LII?
When the check has been terminated successfully, the device determines the next
synchronizing time from the angle difference and the frequency difference. The close
command is issued at synchronization time minus the operating time of the circuit
breaker.
2.14.2 Setting Notes
Preconditions When setting the general power system data (Power system data 1, refer to Section
2.1.3.1) a number of parameters regarding the measured quantities and the operating
mode of the synchronism check function must be applied.
This concerns the following parameters:
8QRP35,0$5< rated primary voltage of the feeder voltage transform-
ers (phase-to-phase) in kV;
8QRP6(&21'$5< rated secondary voltage of the feeder voltage trans-
formers (phase-to-phase) in V;
8WUDQVIRUPHU connection of the additional voltage transformer input
U
4
, must be 8V\QFWUDQVI and connected to a
busbar voltage;
8V\QFFRQQHFW type of voltage which is connected to the device from
the busbar voltage transformer,
ϕ8V\QF8OLQH phase angle displacement between the voltage of the
busbar and that of the feeder in case a power trans-
former is installed inbetween;
8OLQH8V\QF the ratio of the secondary feeder voltage to the sec-
ondary bus-bar voltage under nominal voltage condi-
tions;
5DWHG)UHTXHQF\ the operating range of the synchronism check refers to
the nominal frequency of the power system (f
N
± 3Hz);
)XOO6FDOH9ROW Operational rated voltage of the primary power system
(phase-phase) in kV;
and, if closing at asynchronous system conditions is allowed,
7&%FORVH the closing time of the circuit breaker.
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