Why Do We Need Reactive Power? Reactive power (VARS) is required to maintain the voltage to deliver active power (watts) through transmission lines. ... When there is not enough reactive power, the voltage sags down and it is not possible to push the power demanded by loads through the lines.

Why is reactive power called Useless?

Reactive power is electricity that is both useless and necessary. Electrical power ( P , in Watts) is composed of voltage (V, in Volts) and current (I, in Amps). ... The speed of the current remains the same, however the water becomes denser and the flow is heavier as a result.

What is the importance of reactive power compensation give three points?

Voltage control in an electrical power system is important for proper operation for electrical power equipment to prevent damage such as overheating of generators and motors, to reduce transmission losses and to maintain the ability of the system to withstand and prevent voltage collapse.