A. Large
B. Small
C. Fluctuating
D. Any of the above
Answer: B. Small
Explanation:
The series capacitor is the method of improving the system voltage and impedance by injecting the reactive power in the transmission line.
If the voltage drop is the limiting factor then the series capacitor is very effective. Voltage fluctuations due to the arc furnace can also be compensated by series capacitors.
Series capacitor is also very effective when the total line reactance is high.
It is mostly used in extra and ultra high voltage line but if the load vAR requirement is small series capacitors are of little use.
The shunt capacitor is used for lightly loaded cables or lines.