Phase modifier is normally installed in case of

A. short transmission lines
B. medium length lines
C. long lines
D. for any length of lines

Answer: C. long lines 

Explanation:

synchronous compensator:

  • If it is under the excited condition, it draws the lagging current and, therefore, supplies capacitive or absorbs inductive volt-ampere reactive. 
  • Thus, a current drawn by a synchronous capacitor or condenser can be varied from lagging to leading smoothly by varying its excitation.
  • Synchronous Condensor is also known as Synchronous Compensator or Synchronous Phase Modifier. 
  • A synchronous condenser or a synchronous compensator is a synchronous motor running without a mechanical load.
  • It can generate or absorb reactive volt-ampere (VAr) by varying the excitation of its field winding. 
  • It can be made to take a leading current with over-excitation of its field winding.
  • In such a case it delivers inductive or absorbs capacitive volt-ampere reactive. 
  • If it is under the excited condition, it draws the lagging current and, therefore, supplies capacitive or absorbs inductive volt-ampere reactive. 
  • Thus, a current drawn by a synchronous capacitor or condenser can be varied from lagging to leading smoothly by varying its excitation.
  • Synchronous phase modifiers are installed at load end.
  • Synchronous phase modifiers do not carry Load.
  • Synchronous phase modifiers are nothing but synchronous motors.
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