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Tyler Voss Membership & Communications Specialist+1 314 993 2220tvoss@easa.com
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Cyndi Nyberg Former EASA Technical Support Specialist
Power factor can be best explained with a short illustration. Figure 1 below shows the three elements to consider. First, true power, measured in kW, is the power that does useful work. Reactive power, measured in kVAR, is the power that is stored and returned by all inductive machines, such as motors and transformers. The apparent power, measured in kVA, is the voltage multiplied by the current in the system. Even though the true power is doing the work, the power company has to distribute the apparent power.
Mathematically, the power factor is the cosine of the angle between the true and apparent power. Power factor is defined as the ratio of true power used in an electric circuit to the apparent power, or the power that is apparently being drawn from the source. In a sense, apparent power is “borrowed” from the power company. Since AC power is continuously reversing, the borrowed power is sent back to the system every time the alternating current reverses.
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This 40-page booklet provides great advice for obtaining the longest, most efficient and cost-effective operation from general and definite purpose electric motors.
This booklet covers topics such as:
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The Effect of Repair/Rewinding on Premium Efficiency/IE3 Motors Tests prove Premium Efficiency/IE3 Motors can be rewound without degrading efficiency.
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Recommended Practice for the Repair of Rotating Electrical Apparatus This is a must-have guide to the repair of rotating electrical machines. Its purpose is to establish recommended practices in each step of the rotating electrical apparatus rewinding and rebuilding processes.
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Revised May 2024 The EASA Technical Manual is the association's definitive and most complete publication. It's available FREE to members in an online format. Members can also download PDFs of the entire manual or individual sections.
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