C
A
B
BC
ANSI05000224-2-en.vsd
ANSI05000224 V2 EN
Figure 67: Example of tapped line with Auto transformer
This application gives rise to similar problem that was highlighted in section "Fault infeed
from remote end" that is, increased measured impedance due to fault current infeed. For
example, for faults between the T point and B station the measured impedance at A and C
is as follows:
DOCUMENT11524-IMG3509 V3 EN
(Equation 45)
A C
2
C Trf CT TB
C
I I V2
Z Z (Z Z ) ( )
V1
I
+
= + + × ×
EQUATION1714 V1 EN (Equation 46)
1MRK 506 369-UUS - Section 8
Impedance protection
Line distance protection REL670 2.2 ANSI 171
Application manual
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