Siemens 7SR12 Argus - Page 275

7SR11 & 7SR12 Installation Guide
©2017 Siemens Protection Devices Limited Chapter 5 Page 23 of 32
Ia, Ib, Ic
In
Ig
CT/VT CONFIG:
Phase Current
Input
Phase CT Ratio
Earth Current
Input
Earth CT Ratio
50/51 - Phase
Overcurrent
50N/51N -
Derived E/F
50G/51G -
Measured 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
S2 S
1
P2 P1
Direction of power flow
In the forward direction
1A
5A
Ig
A25
A26
A27
A28
Ic
Ib
1A
5A
A21
A22
A23
A24
1A
5A
A17
A
18
A
19
A20
Ia
1A
5A
A13
A14
A15
A16
A B C
S
2 S1
P2
P1
Direction of power flow
In the forward direction
S2 S1
P2 P1