A
B
I
a = 0
I
b = 0
I
b = 0
I
c = 0
I
Io
zone of
protection
C
a
b
c
I
N
I
zs1
I
zs1
I
zs1
Io
I
N
Reference is Neutral
Current
Restrain for
external fault
Operate for
internal fault
For external fault
Uzs
GUID-FAC5E4AD-A4A7-4D39-9EAC-C380EA33CB78 V2 EN
Figure 149:
Current flow in all the CTs for an external fault
Section 4
1MRS240050-IB C
Protection functions
308
REF615R
Technical Manual
Summary of Contents for RELION REF615R
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