Function non-directional Class 3 Class 1 Class 3
NOTE
The class accuracy according to IEC 61869-2 below 5% I
rated
(< 50 mA secondary) is not defined in general.
For very sensitive directional measurements, Siemens recommends the classes 0.5S or 0.1S that define the
class accuracy via an extended current range (up to 1% I
rated
) (see chapter 5.6.201.5, IEC 61869-2).
Another possibility is to correct the phase-angle error of the transformer on the device, if this error is
known (see function description Sensitive ground-fault detection.
Appendix
A.6 Current Transformer Requirements
SIPROTEC 5, Overcurrent Protection, Manual 1593
C53000-G5040-C017-8, Edition 07.2017
To Next Page
Loading...
