Siemens siprotec 7SD5 User Manual

2 Functions
318
7SD5 Manual
C53000-G1176-C169-1
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 Nominal primary voltage of the feeder voltage trans-
formers (phase-to-phase) in kV;
204 Unom SECONDARY Nominal secondary voltage of the feeder voltage trans-
formers (phase-phase) in V;
210 U4 transformer Connection of the additional voltage transformer input
U
4
of the device; must be Usync transf. and con-
nected to any voltage of the bus-bar;
212 Usync connect. Type of voltage which is connected to the device from
the busbar voltage transformer,
214 ϕ Usync-Uline Phase angle displacement between the busbar
voltage and the feeder voltage in case a power trans-
former is installed in between;
215 U-line / Usync Ratio between secondary feeder voltage and second-
ary bus-bar voltage under nominal voltage conditions;
230 Rated Frequency The operating range of the synchronism check refers
to the nominal frequency of the power system
(f
N
± 3Hz);
1103 FullScaleVolt. Nominal operational voltage of the primary power
system (phase-phase) in kV;
and, if closing at asynchronous system conditions is allowed,
239 T-CB close The closing time of the circuit breaker.
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.
General The synchronism check function can only operate if it was configured as Enabled
(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 =“, 647 „F-diff=“, 649 „F-line=“, 646 „F-bus =“ and 648
„ 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..
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Siemens siprotec 7SD5 Specifications

General

Brand	Siemens
Model	siprotec 7SD5
Category	Relays
Language	English