capacitor increases and therefore the system voltage at the receiving line end can be
regulated.
Series compensation also extends the region of voltage stability by reducing the reactance
of the line and consequently the SC is valuable for prevention of voltage collapse. Figure
69 presents the voltage dependence at receiving bus B (as shown in figure 68) on line
loading and compensation degree K
C
, which is defined according to equation 48. The
effect of series compensation is in this particular case obvious and self explanatory.
EQUATION1895 V1 EN (Equation 359)
A typical 500 km long 500 kV line is considered with source impedance
EQUATION1896 V1 EN (Equation 360)
~
E
A
Z
SA1
Power line
A B
Seires
capacitor
Load
en06000585.vsd
IEC06000585 V1 EN
Figure 197: A simple radial power system
en06000586_ansi.vsd
0 200 400 600 800 1000 1200 1400 1600 1800
100
200
300
400
500
P[MW]
V
[
k
V
]
V
limit
P
0
P
3
0
P
5
0
P
7
0
ANSI06000586 V1 EN
Figure 198: Voltage profile for a simple radial power line with 0, 30, 50 and 70% of
compensation
1MRK 506 369-UUS - Section 8
Impedance protection
Line distance protection REL670 2.2 ANSI 401
Application manual
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