What is power factor correction?
Any electrical equipment, whose functioning is basing on alternating magnetic field, is the source of the so called inductive reactive electrical power Q. Such equipment is all electrical motors, transformers, and also lines.
The reactive electrical power is unavoidable for both generation and maintenance of the necessary alternating magnetic field, but in no circumstances it can be converted into the active power W.The electrical current directly related to the mentioned inductive reactive power is called inductive current and is lagging by 90º to the actual network voltage. To the same 90º is also lagging the inductive reactive power to the active power. Electrical generators as well as lines are therefore loaded by the addition of both active and inductive reactive power. The consumption of the inductive reactive power is charged by electrical utilities. The mathematical geometrical addition of active and reactive power is called apparent power S. The ratio inductive reactive power to apparent power is called power factor cosφ.
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