Sunday, 5 May 2013

Power Factor

What is power Factor?

  • Ratio between real and apparent power is known as power factor.

  • Cosine of phase angle between Real and apparent powers is known as power factor.
PF = cos θ

Disadvantages of Low power Factor:
  • Large KVA rating of equipment:
KVA= KW / cosθ
If equipment has low power factor  then KVA rating of the equipment greater making the equipment larger and expensive
  • Greater conductor size.
  • Larger copper losses, grater the KVA rating, greater the current, due to large current copper losses also increases
  • Poor voltage regulation.
  • High energy bill:
Low power factor  increases the KVA demand which in turn increases the energy bill.
Energy bill = KVA demand charges + energy charges


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