Appendix
A.4 Current Transformer Requirements
SIPROTEC, 7SD80, Manual
E50417-G1140-C474-A1, Release date 09.2011
350
Class Accuracy
Table A-2 Minimum required class accuracy depending on the neutral point grounding and the operation
of the function
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“).
Neutral point Isolated Resonant-grounded system
Function directional Class 1 Class 1
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