Siemens SIPROTEC 4 7UT6 Series Manual page 126

Functions
2.3 Restricted Earth Fault Protection
[erddiff-dreieckswicklung-020926-rei, 1, en_GB]
Figure 2-54
[erddiff-querdrossel-020926-rei, 1, en_GB]
Figure 2-55
126
Restricted earth fault protection on a non-earthed transformer winding with neutral reactor
(starpoint former) within the protected zone
Restricted earth fault protection on an earthed shunt reactor with CTs in the reactor leads
SIPROTEC 4, 7UT6x, Manual
C53000-G1176-C230-5, Edition 09.2016