Class Accuracy - Siemens SIPROTEC 7SD80 Manual

Appendix
A.4 Current Transformer Requirements

Class Accuracy

Table A-2 Minimum required class accuracy depending on the neutral point grounding and the operation
of the function
Neutral point
Function directional
An angle correction may have to be parameterized at the device for particularly small ground fault currents (see
Description of the „sensitive ground fault detection").
350
Isolated
Class 1 Class 1
Resonant-grounded system
SIPROTEC, 7SD80, Manual
E50417-G1140-C474-A1, Release date 09.2011