Class Conversion; A.4.2 Class Conversion - Siemens SIPROTEC 7SK80 Manual
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Also See for SIPROTEC 7SK80:
- Manual (512 pages) ,
- Product information (80 pages) ,
- Manual (62 pages)
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A.4.2
Class conversion
Table A-1
British Standard BS 3938
ANSI/IEEE C 57.13, class C
IEC 60044-6 (transient response), class
TPS
Classes TPX, TPY, TPZ
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A4, Release date 08.2010
Conversion into other classes
I
= 5 A (typical value)
sNom
K≈ 1
K
≈ K
SSC
ALF
Calculation See ChapterA.4.1 Accuracy limiting factors with: K
K
ALF
T
depending on power system and specified closing sequence
P
with
V
Knee-point voltage
k
R
Internal burden resistance
Ct
R
Nominal burden resistance
BN
Secondary nominal transformer current
I
sNom
KALF
Rated accuracy limiting factor
V
Sec. terminal voltage at 20 I
s.t.max
V
Sec. magnetization limit voltage
al
K
Dimensioning factor
K
Factor syymetr. Rated fault curent
SSC
T
Primary time constant
P
A.4 Current Transformer Requirements
pNom
Appendix
≈
SSC
425
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