Siemens SIPROTEC 7SD600 System Manual page 37

4
Method of operation
Numerical line differential protection SIPROTEC 7SD600 V3.0
If the connection is changed so that it no longer com
plies with Figure 4.2, it must be noted that the same
connection must be used at both line ends, and that it
is essential to ensure compliance with the technical
data of the 7SD600 (e.g. thermal rating).
L1 L2 L3
Figure 4.3 Connection of summation transformer 4AM4930 to 2-current transfor
mers in isolated-neutral systems or systems which are not effectively
earthed.
4 - 4
System manual Order no. E50417-G1176-C069-A1
Figure 4.3 shows connection of the 4AM4930 to
2-current transformers (only for isolated-neutral or
resonant-earthed system).
A Y
B
C
D
E
F
G
H
I
K
L
M Z
to 7SD600
U
Siemens AG January 1999