2 Functions
38
7SD610 Manual
C53000-G1176-C145-4
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.
It must be considered that this deviation is referred to the mean current value between
the extrema of the tap changer position at rated apparent power, not to the current
value at rated voltage and rated power. This requires a further correction of the data
of the protected object 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 Ad-
ditional 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
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
220 I4 transformer Not connected
In prot. line
IY starpoint
In prot. line I4 current transformer is
221 I4/Iph CT 0.010 .. 5.000 1.000 Matching ratio I4/Iph for CT's
230 Rated Frequency 50 Hz
60 Hz
50 Hz Rated Frequency
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