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2 Functions
This results in the following:
Rated current at rated voltage
Rated current at U
Rated current at U
The maximum deviation from this current is
This maximum deviation δ
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
201
CT Starpoint
203
Unom PRIMARY
204
Unom SECONDARY
205
CT PRIMARY
206
CT SECONDARY
207
SystemStarpoint
210
U4 transformer
211
Uph / Udelta
220
I4 transformer
221
I4/Iph CT
230
Rated Frequency
38
I
+ 10 %
N
min
I
– 10 %
N
max
[in %] has to be added to the maximum transformer
max
Setting Options
towards Line
towards Busbar
0.4 .. 1200.0 kV
80 .. 125 V
10 .. 10000 A
1A
5A
Solid Earthed
Peterson-Coil
Isolated
Not connected
Udelta transf.
Ux transformer
0.10 .. 9.99
Not connected
In prot. line
IY starpoint
0.010 .. 5.000
50 Hz
60 Hz
I
= 184 A
N
= 167 A
= 202 A
Default Setting
towards Line
CT Starpoint
400.0 kV
Rated Primary Voltage
100 V
Rated Secondary Voltage (Ph-Ph)
1000 A
CT Rated Primary Current
1A
CT Rated Secondary Current
Solid Earthed
System Starpoint is
Not connected
U4 voltage transformer is
1.73
Matching ratio Phase-VT To
Open-Delta-VT
In prot. line
I4 current transformer is
1.000
Matching ratio I4/Iph for CT's
50 Hz
Rated Frequency
Comments
7SD610 Manual
C53000-G1176-C145-4
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