Siemens 7SK80 - Class Accuracy

Appendix
A.4 Current Transformer Requirements
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A5, Release date 11.2012
444
Class accuracy
Table A-2 Minimum required class accuracy depending on neutral grounding and function operating prin-
ciple
For extremely small ground fault currents it may become necessary to correct the angle at the device (see func-
tion description of „sensitive ground fault detection“).
Neutral point isolated resonant-grounded high-resistance ground-
ed
Function directional Class 1 Class 1 Class 1
Function non-directional Class 3 Class 1 Class 3