Capacitive
Inductive
200
400
600
800
1000
200
400
600
Q
(Mvar)
500 1000 1500
Power flow
(MW)
(T.L.)
(S.C.)
(T.L.
+
S.C.)
Transmission
Line
Series
Compensation
500 kV
500 km
k = 50 %
en06000589.vsd
IEC06000589 V1 EN
Figure 75: Self-regulating effect of reactive power balance
Increase in power transfer
The increase in power transfer capability as a function of the degree of compensation
for a transmission line can be explained by studying the circuit shown in figure
76. The
power transfer on the transmission line is given by the equation 124:
( ) ( )
( )
A B A B
Line C Line C
V V sin V V sin
P
X X X 1 K
d d
× × × ×
= =
- × -
EQUATION1994-ANSI V1 EN (Equation 124)
The compensation degree K
c
is defined as equation 122
A B
-jX C
P
A
Q
A
P
B
Q
B
V
A
V
B
V
+jXL
V
A
V
B
en06000590_ansi.vsd
D
d
ANSI06000590 V1 EN
Figure 76: Transmission line with series capacitor
Section 3 1MRK504116-UUS C
IED application
208
Application manual
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