Siemens 7SR12 Argus - Page 274

7SR11 & 7SR12 Installation Guide
Chapter 5 Page 22 of 32 ©2017 Siemens Protection Devices Limited
Ia, Ib, Ic
In
CT/VT CONFIG:
Phase Current
Input
Phase CT Ratio
50/51 - Phase
Overcurrent
50N/51N -
Derived E/F
Selects 1 or 5A
CT ratio for
primary meters
1A
5A
Ig
A25
A26
A27
A28
Ic
Ib
1A
5A
A21
A
22
A23
A
24
1A
5A
A
17
A18
A19
A20
Ia
1A
5
A
A13
A14
A
15
A
16
A B C
S
2 S1
P2 P1
Direction of power flow
In the forward direction