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What is power factor, anyhow?
The best way to think of it is that a load with a low power factor will move a lot of electricity back-and-forth in the power lines without actually consuming the energy. You get billed for the amount of power the load uses, but a higher amount if moving back-and-forth, and being disipated as heat in the power lines, transformers and so on. So, there's a real cost to the electricity company, but it doens't show on the meter. That's why larger industrial users with poor power factors will be charged for it, and why some install local capacitors to act as reservoirs to restrict the back-and-forth to their own premises, thereby avoiding all the waste in the power transmission system. |
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