ABB 615 Series - Page 550

A
B
C
1/5A
N
IG
1/5A
N
1/5A
N
1/5A
N
I_CI_BI_A
P1P2
P1 P2
S1
S2
S1
S2
GUID-3B436FE3-EBC7-499F-AEAF-C07A9FA84CCD V1 EN
Figure 270: Connection of the current transformers of Type 1. The connected phase
currents and the neutral current have opposite directions at an external
ground-fault situation. Both groundings are inside the area to be
protected.
A
B
C
1/5A
N
1/5A
N
1/5A
N
I_AI_BI_C
1/5A
N
IG
P2P1
P2
P1
S1
S1
S2
S2
GUID-1E53D59D-9402-45EA-8849-210B413BB8BD V
Figure 271: Connection of the current transformers of Type 1. The connected phase
currents and the neutral current have opposite directions at an external
ground-fault situation. Both groundings are outside the area to be
protected.
Section 4 1MAC059074-MB A
Protection functions
544 615 series ANSI
Technical Manual