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Title:

Power Factor Correction

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Power Factor Correction KW KVA KVAR Reasons behind P.F corrections Power Factor is the ratio between Power and Apparent Power Motors Formula P.F P.F = watts/va Or P.F ... – PowerPoint PPT presentation

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Title: Power Factor Correction


1
Power Factor Correction
  • KW
  • KVA
  • KVAR

2
Reasons behind P.F corrections
  • Power Factor is the ratio between Power and
    Apparent Power
  • Motors

3
Formula P.F
  • P.F watts/va
  • Or
  • P.F P/S

4
Power Factor Improvement
  • Over Correction
  • Individual power factor correction

5
Power Factor Improvement
  • Group power factor correction

6
Utility P.F Correction
  • centralized automatic power factor correction

7
Common Types of Capacitors
8
3 Phase Capacitor
9
Reactors
  • Shunt Reactors
  • Series Reactors

10
Underground Networks
  • Edmonton downtown network
  • Calgary downtown network

11
Benefits of Power Factor Correction
  • Reduce electrical costs.
  • Reduce load losses of the distribution system.
    I²R Loss
  • Increase the system's capacity.
  • Maintain a better voltage regulation on the
    system.
  • Improves P.F.

12
Safety
  • Capacitors hold charges
  • High Quality Capacitors
  • Capacitors in transit

13
Rules for P.F Calculations
  • Power input in a load is what the utility see as
    load
  • P KW or W

14
Rules
  • Power is constant
  • KW or Watts
  • Output power is what the customer sees
  • KW or Watts

15
Rules
  • Cal. All Power Values _at_ original P.F 1st
  • Sm Pm Qm
  • Cal. All Power Values _at_ New P.F (corrected p.f)
  • Using Pm constant
  • Scor and Qcor or Delivered

16
Rules
  • Find the Qreq or the Q of the cap required to
    correct the P.F
  • Qcap Qm - Qcor
  • Cal Size of Caps Xc value
  • Xc E²/Qcap

17
Rules
  • Cal the Cap size to µF
  • C1 x 106 / 2? f Xc
  • Assume 60 Hz

18
Rules
  • Size the cap for total bank size if required per
    individual cap divide by 3
  • Remember Power is always constant

Qt vS² - P²
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