ABB RELION 620 Series Technical Manual page 443

1MAC504801-IB E
620 series ANSI
Technical Manual
A B C
W1
W2
W3
GUID-CE87FD99-A5A4-4D0E-883F-4D434E4F21C9 V1 EN
Figure 202: Connection of current transformers of Type 1 and example of currents
during external fault
A
X120
7 1/5A
A1
8 N
9 1/5A
B1
10
N
11
1/5A
C1
12
N
W1
W2
X120
1 1/5A
A2
2 N
3 1/5A
B2
4 N
5 1/5A
C2
6
N
Section 4
Protection functions
B C
X120
1/5A
7
8 N
9 1/5A
10
N
11
1/5A
12
N
W3
X120
1/5A
1
2 N
3 1/5A
4
N
5
1/5A
6
N
A1
B1
C1
A2
B2
C2
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