Functions
2.1 General
SIPROTEC, 7SD610, Manual
C53000-G1176-C145-6, Release date 02.2011
39
Calculation example:
Transformer YNd5
35 MV
110 kV / 25 kV
Y-winding with tap changer ±10 %
This results in the following:
Rated current at rated voltage I
N
= 184 A
Rated current at U
N
+ 10 % I
min
= 167 A
Rated current at U
N
– 10 % I
max
= 202 A
The maximum deviation from this current is
This maximum deviation δ
max
[in %] has to be added to the maximum transformer errors 253 E% ALF/ALF_N
and 254 E% K_ALF_N as determined above.
Please consider that this deviation through voltage control is referred to the mean current at rated apparent
power and not to the rated current at rated voltage. This requires an adequate correction of the setting values
as discussed in Section 2.1.4 under „Topological Data for Transformers (optional)“.
2.1.2.2 Settings
Addresses which have an appended "A" can only be changed with DIGSI, under Additional Settings.
Addr. Parameter Setting Options Default Setting Comments
201 CT Starpoint towards Line
towards Busbar
towards Line CT Starpoint
203 Unom PRIMARY 0.4 .. 1200.0 kV 400.0 kV Rated Primary Voltage
204 Unom SECONDARY 80 .. 125 V 100 V Rated Secondary Voltage (Ph-Ph)
205 CT PRIMARY 10 .. 10000 A 1000 A CT Rated Primary Current
206 CT SECONDARY 1A
5A
1A CT Rated Secondary Current
207 SystemStarpoint Solid Earthed
Peterson-Coil
Isolated
Solid Earthed System Starpoint is
208A 1-1/2 CB NO
YES
NO 1-1/2 Circuit breaker arrangement
210 U4 transformer Not connected
Udelta transf.
Ux transformer
Not connected U4 voltage transformer is
211 Uph / Udelta 0.10 .. 9.99 1.73 Matching ratio Phase-VT To
Open-Delta-VT
To Next Page
Loading...
Need help?
General