Series capacitors on transmission lines are of little use when

A. the load VAR requirement is small
B. the load VAR requirement is large
C. the load VAR requirement is fluctuating
D. series capacitors are never used in the transmission lines

Answer: A. the load VAR requirement is small

Explanation: 

Series capacitors: 

  • Series capacitors are used to compensate the inductance of the transmission line. 
  • They will increase the transmission capacity and the stability of the line. 
  • These are also used to share the load between parallel lines.
  • Series capacitor is used in a transmission line to compensate the voltage Drop.
  • In series compensation, the FACTS is connected in series with the power system. 
  • It works as a controllable voltage source. 
  • Series inductance occurs in long transmission lines, and when a large current flows this causes a large voltage drop. 
  • To compensate, series capacitors are connected, decreasing the effect of the inductance.

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