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VFD's Can Be Used to Improve Input Power Factor

Oct 01, 2013

In very basic terms, power factor is expressed as the ratio of real power, kilowatts (kW), to apparent power, kilovolt-amperes (kVA). A desirable ratio of near unity results when the real power and apparent power are nearly equivalent. Power factor is an indication of how effectively a load uses power. A high power factor indicates effective utilization of electrical power, while a low power factor indicates poor utilization. Utilities charge higher rates when power factor is low because of the extra burden imposed on the distribution system. Not only does the distribution system have to accommodate the real power being consumed, but it must also accommodate the reactive (non work producing) component flowing within the system.

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