ABB Relion 670 series - Tapped Line Application

• Different setting values that influence the ground-return compensation for different
distance zones within the same group of setting parameters.
• Different groups of setting parameters for different operating conditions of a
protected multi circuit line.
8.4.2.8 Tapped line application
A
B
21 21
21
C
T
IC
IA
IB
-IB
ANSI09000160-1-en.vsd
F
ANSI09000160 V1 EN
Figure 130: 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
will be
A C
A AT TF
A
I I
Z Z Z
I
+
= + ×
EQUATION2302 V1 EN (Equation 169)
1MRK 506 369-UUS - Section 8
Impedance protection
Line distance protection REL670 2.2 ANSI 265
Application manual