Figure A1 Connection L1-L2-L3 With Reduced Earth-Fault Sensitivity, Preferable For Effectively Earthed Networks With Particularly Low Zero Sequence Impedance - Siemens SIPROTEC 7SD600 System Manual

Numerical line differential protection SIPROTEC 7SD600 V3.0
L-
I
L1
I
L2
I
L3
I
E
L1 L2 L3
Figure A1 Connection L1-L2-L3 with reduced earth-fault sensitivity,
preferable for effectively earthed networks with particularly low zero sequence impedance
Siemens AG January 1999
Summation transformer
4AM4930
C
2
H
A
1
F
L
3
M
Bridged terminals: D-G;
B-E
Appendix
System manual Order no. E50417-G1176-C069-A1
! Caution!
The pilot wires may neither
be earthed nor equipped
with surge arresters.
7SD600
13
Y 6
Z 5
A
L+
14
1
PWM
2
A - 3