A. Short-circuit current of the system is increased
B. Large conductor area is required for same power transmission
C. Load power factor in heavy loads
D. All of the above
Answer: A. Short-circuit current of the system is increased
Explanation:
In constant voltage transmission, a constant voltage drop is maintained along the line with the help of the phase modifiers (synchronous motor running without mechanical load) at the receiving end.
With the change in load, the power factor of the system is changed by the synchronous motors and thus voltage drop along the line remains constant.
The main disadvantage of constant power transmission is
Increased the risk of interruption of supply due to falling of synchronous motors
Short-circuit current in the system is increased.