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Application Note 42047 Power Factor Correction (PFC) Basics


What is Power Factor?
Power factor (pf) is defined as the ratio of the real power (P)
to apparent power (S), or the cosine (for pure sine wave for
both current and voltage) that represents the phase angle
between the current and voltage waveforms (see Figure 1).
The power factor can vary between 0 and 1, and can be either
inductive (lagging, pointing up) or capacitive (leading, pointing
down). In order to reduce an ....etc

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K.D. Slack




ABSTRACT
The traditional approach to power factor correction in a facility is to add capacitors to individual loads such as motors and fluorescent lighting circuits, to add a capacitor bank with switching to a major distribution panel, or to add a capacitor bank with switching to the power input panel from the utility lines. Recently it has been shown that careful selection of high-efficiency motors for a facility can result in new motors with a significantly higher power factor than t ....etc

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WELCOME POWER FACTOR CORRECTION


Submitted By:
Rajat Kumar Barik
Electrical Branch


INTRODUCTION
1. Power factor is the percentage of electricity that is being used to do useful work
2. Power factor =Active power/Apparent power
3. Apparent power has two component:
(a) Active power
(b)Reactive power



DEFINATION
o ACTIVE POWER: Active power does all the work.
o UNIT : kw
o P= v I cos
o REACTIVE POWER: I t is the pseudo power(false) power which flows fro ....etc

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Abstract
This paper presents a simplified sinusoidal uninterruptible power supply (UPS) system. The proposed scheme includes features such as high power factor, low total harmonic distortion and good dynamic response at the ac output voltage. In addition, the scheme has the desirable characteristics of high efficiency, simple circuit and low cost compared with a traditional standalone multiple stages UPS with power factor correction. The paper also presents the circuit operation, the analysis and, experimental results of the proposed UPS sch ....etc

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http://seminarsprojects.net/Thread-power-factor-correction?pid=51952

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