Siemens SIPROTEC 4 7SD80

Current Transformer Ratio
Maximum ratio between primary currents of
the current transformers at both ends of the
protected object.
0.25 ≥ Ι
pn-local
/ Ι
pn-remote
≤ 4
Note:
The maximum ratio can also be selected
greater or smaller. It may be that the sensitivity
of the differential protection indicated in the
technical data are no longer observed.
Ι
pn-local
: Primary rated transformer current of the local device
Ι
pn-remote
: Primary rated transformer current of the remote
device
D.1
Current Transformer Requirements
D.1 Current Transformer Ratio
318 SIPROTEC 4, 7SD80, Manual
E50417-G1100-C474-A2, Edition 02.2018