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Section 8
Impedance protection
8.3.3.2
246
X
=
K
C
C
X
Line
EQUATION1895 V1 EN-US
A typical 500 km long 500 kV line is considered with source impedance
=
Z
0
SA
1
EQUATION1896 V1 EN-US
A
Z
SA1
~
E
A
Seires
capacitor
IEC06000585 V1 EN-US
Figure 106:
A simple radial power system
500
400
300
200
100
0
200
400
600
800
ANSI06000586 V1 EN-US
Figure 107:
Voltage profile for a simple radial power line with 0, 30, 50 and 70% of
compensation
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 108.
The power transfer on the transmission line is given by the equation 102:
( )
d
×
×
V
V
sin
=
=
A
B
P
-
X
X
Line
C
EQUATION1994-ANSI V1 EN-US
The compensation degree K
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
B
Power line
Load
en06000585.vsd
V
limit
1000
1200
1400
1600
1800
P[MW]
en06000586_ansi.vsd
( )
d
×
×
V
V
sin
A
B
(
)
×
-
X
1 K
Line
C
is defined as equation
c
1MRK 502 071-UUS A
(Equation 100)
(Equation 101)
GUID-C9163D4E-CC2B-4645-B2AC-2C8A3FE3D337 v3
(Equation 102)
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