Distance IED near the feeding bus will see in different cases fault on remote end bus
depending on type of overvoltage protection used on capacitor bank (spark gap or
MOV) and SC location on protected power line.
en06000612_ansi.vsd
~
E
A
0%
33%
50%
66%
K
C
=
80% 33% 33%50 %
21
100 %
80 %
X
ANSI06000612 V1 EN
Figure 91: Typical locations of capacitor banks on series compensated line
Implementation of spark gaps for capacitor overvoltage protection makes the picture
relatively simple, because they either flash over or not. The apparent impedance
corresponds to the impedance of non-compensated line, as shown in figure 92 case K
C
= 0%.
en06000613.vsd
j
X
R
KC = 0%
KC = 80%
LOC = 0%
KC = 50%
LOC = 50%
j
X
j
X
R R
KC = 2 x 33%
LOC = 33%, 66%
KC = 80%
LOC = 100%
j
X
j
X
R R
IEC06000613 V1 EN
Figure 92: Apparent impedances seen by distance IED for different SC locations
and spark gaps used for overvoltage protection
1MRK504116-UUS C Section 3
IED application
223
Application manual
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