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Reactive Power
2019-04-03

Reactive power is relatively abstract, it is used in electric and magnetic fields in circuits, and is used to establish and maintain electrical power in electrical equipment. For electrical equipment with electromagnetic coils, reactive power must be consumed to establish a magnetic field. Because it does not work outside, it is called "reactive."


Q = U*I*sinφ = S*sinφ


Q = Reactive power

S = Apparent power

φ= the phase difference between voltage and current



The harm of reactive power:

1.Reduce the output of the generator's active power

2.Reduce the power supply capacity of transmission and transformation equipment

3.This causes an increase in line voltage loss and an increase in power loss.

4.This results in low power factor operation and voltage drop, resulting in insufficient electrical equipment capacity.