Ensure that the underreaching zones from both line ends will overlap a sufficient amount
(at least 10%) in the middle of the protected circuit.
8.3.2.7 Tapped line application
C
A
B
BC
ANSI05000224-2-en.vsd
ANSI05000224 V2 EN
Figure 120: 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
DOCUMENT11524-IMG3509 V3 EN
(Equation 127)
1MRK 506 369-UUS - Section 8
Impedance protection
Line distance protection REL670 2.2 ANSI 239
Application manual
To Next Page
Loading...
