Class Conversion
Table D-1 Conversion into other classes
British Standard BS 3938
ANSI/IEEE C 57.13, Class C
Ι
sn
= 5 A (typical value)
with
U
k
Knee-point voltage
R
Ct
Internal burden
R
B
Rated burden
Ι
sn
Secondary rated transformer current
K
SSC
Rated overcurrent factor
U
s.t.max
sec. terminal voltage at 20 Ι
pn
NOTE
Detailed information on the transformer design is available on the Internet. (www.siprotec.de)
D.3
Current Transformer Requirements
D.3 Class Conversion
320 SIPROTEC 4, 7SD80, Manual
E50417-G1100-C474-A2, Edition 02.2018
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