en06000586.vsd
0
200
400
600
800
1000
1200
1400
1600
1800
100
200
300
400
500
P[MW]
U
[k
V
]
U
limit
P
0
P
3
0
P
5
0
P
7
0
IEC06000586 V1 EN-US
Figure 212: Voltage profile for a simple radial power line with 0, 30, 50 and 70% of
compensation
7.13.3.2
Increase in power transfer
GUID-C9163D4E-CC2B-4645-B2AC-2C8A3FE3D337 v3
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
transfer on the transmission line is given by the equation
:
( )
( )
(
)
sin
sin
1
d
d
×
×
×
×
=
=
-
× -
A
B
A
B
Line
C
Line
C
U
U
U
U
P
X
X
X
K
EQUATION1897 V1 EN-US
(Equation 383)
The compensation degree K
c
is defined as equation
A
B
-jX
C
P
A
Q
A
P
B
Q
B
U
A
U
B
U
+jX
L
U
A
U
B
d
D
en06000590.vsd
IEC06000590 V1 EN-US
Figure 213: Transmission line with series capacitor
The effect on the power transfer when considering a constant angle difference (δ) between
the line ends is illustrated in figure
. Practical compensation degree runs from 20 to 70
percent. Transmission capability increases of more than two times can be obtained in practice.
Section 7
1MRK 505 343-UEN B
Impedance protection
338
Application manual
Содержание Relion 670 series
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