# Power Factor Correction

Figure 1 Power Factor Correction

Note: The ammeters & Voltmeters read PEAK values, but the Wattmeter reads true rms power.

This circuit is available on StudyNet as pfcor.sch, for use with TinaPlus in D411/D421.

This lab consist of two sessions

Session 1: Preparation (2 Hours).

This is an open lab session where you will need to fill up the preparation answer sheet Session 2: Lab experiment (2 Hours).

This is a supervised session where you will need to perform a simulation and fill up the experimental answer sheet.

Preparation answer sheet (Theoretical calculations)

Within the space provided Calculate:

1. The values of R & L in the load, for both series & parallel connections, to achieve the load conditions (S=10kVA and pf=0.9). -------------------------------------------------

Calculation Area (5%):

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p.f=cos⏀=0.9

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⏀= cos-1(0.9)=25.84°

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S=10 kVA

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P=S ×p.f=10 ×0.9=9 kW

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Q= S2-P2=10k2-9k2=19=4.3589 kVAr

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Calculations for R & L Series (5%):

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S=VIrl → Irl=10×103415=24.096 A (Current is the same in series) -------------------------------------------------

P=Irl2R → R=9×10324.0962=15.5007 Ω

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R=15.5 Ω

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Q=Irl2Xl → Xl=19×10324.0962=7.50735 Ω

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Xl=2πfL → L=7.50735100π=0.023896 H

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L=23.9 mH

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Calculations for R& L Parallel (5%):

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P=V2R →R=...

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