upgrading of line protections on the compensated as well as, adjacent lines should
be considered. The main advantages of series compensation against the new
transmission line within the same corridor are:
• Significantly reduced investment costs; the same increase in power
transmission for up to 90% reduced costs
• In many cases, the only practical way to increase the transmission capacity of
a corridor
• Series compensation shortens the lead times
• Environmental impact
~
E
A ~
E
B
New transmission line
Series compensation
en06000594.vsd
IEC06000594 V1 EN-US
Figure 74: Series compensation is an important alternative to new
transmission lines
Advancements in series compensation using thyristor switching
technology
SEMOD168320-102 v3
A thyristor switched series capacitor (TSSC) can be used for power flow control.
This is performed by changing the reactance of the transmission circuit in discrete
steps, as shown in figure
75. A TSSC typically consists of a few segments in series
that can be inserted independently of each other in order to achieve different total
series capacitor reactance.
en06000595.vsd
Fw
Rv
-jX
C
Fw
Rv
-jX
C
Fw
Rv
-jX
C
IEC06000595 V1 EN-US
Figure 75: Thyristor switched series capacitor
1MRK 506 369-UEN B Section 8
Impedance protection
Line distance protection REL670 2.2 IEC 167
Application manual
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