Setting Notes - Siemens siprotec 7SD5 User Manual

2 Functions

2.16.2 Setting Notes

Preconditions When setting the general power system data (Power system data 1, refer to Section
2.1.2.1) 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:
203 Unom PRIMARY
204 Unom SECONDARY
210 U4 transformer
212 Usync connect.
214 ϕ Usync-Uline
215 U-line / Usync
230 Rated Frequency
1103 FullScaleVolt.
and, if closing at asynchronous system conditions is allowed,
239 T-CB close
WARNING!
Closing at Asynchronous System Conditions!
Closing under asynchronous system conditions requires the closing time of the circuit
breaker to be set correctly in the Power System Data 1 (address 239).
Otherwise, faulty synchronization may occur.
The synchronism check function can only operate if it was configured as Enabled
General
(address 135) and U4 transformer as Usync transf. (address 210) during con-
figuration of the functional scope.
The measured values from synchronism check (636 „Udiff =", 637 „Uline =",
638 „Ubus
„ ϕdif=") are only available, or will only be calculated, if the synchronism check was
set to Enabled and the parameter U4 transformer (address 210) has been set to
Usync transf..
318
Nominal primary voltage of the feeder voltage trans-
formers (phase-to-phase) in kV;
Nominal secondary voltage of the feeder voltage trans-
formers (phase-phase) in V;
Connection of the additional voltage transformer input
of the device; must be Usync transf. and con-
U
4
nected to any voltage of the bus-bar;
Type of voltage which is connected to the device from
the busbar voltage transformer,
Phase angle displacement between the busbar
voltage and the feeder voltage in case a power trans-
former is installed in between;
Ratio between secondary feeder voltage and second-
ary bus-bar voltage under nominal voltage conditions;
The operating range of the synchronism check refers
to the nominal frequency of the power system
± 3 Hz);
(f
N
Nominal operational voltage of the primary power
system (phase-phase) in kV;
The closing time of the circuit breaker.
=", 647 „F-diff=", 649 „F-line=", 646 „F-bus =" and 648
7SD5 Manual
C53000-G1176-C169-1