Breaking News
Home » Generation Transmission and Distribution » Causes of low Power Factor

Causes of low Power Factor

 
Causes of low Power Factor
The main cause of low Power factor is Inductive Load. As in pure inductive circuit, Current lags 90° from Voltage, this large difference of phase angle between current and voltage causes zero power factor. Basically, all those circuit having Capacitance and inductance (except resonance circuit (or Tune Circuit) where inductive reactance = capacitive reactance (XL = Xc), so the circuit becomes a resistive circuit), power factor would be exist over there because Capacitance and inductance causes in difference of phase angle (θ) between current and voltage.
there are a lot of disadvantages of low Pf and we must improve Pf .
Following are the causes of low Power factor:
1. Single phase and three phase induction Motors(Usually, Induction motor works 
    at poor power factor i.e. at:
    Full load, Pf = 0.8 -0.9
    Small load, Pf = 0.2 -0.3
    No Load, Pf may come to Zero (0).
2.  Varying Load in Power System(As we know that load on power system is varying. During low load period, supply voltage is increased which increase the magnetizing current which cause the decreased power factor)
3.  Industrial heating furnaces
4.  Electrical discharge lamps (High intensity discharge lighting) Arc lamps (operate 
     a very low power factor)
5.  Transformers
6.  Harmonic Currents

You may also read about:

EasyEDA: A Powerful Free Circuit, Simulation & PCB Design Tool
Register now to use it for free in Your Browser. No Need to download. Lots of resources and Step by step tutorials

About Electrical Technology

All about Electrical & Electronics Engineering & Technology. Follow , Facebook , Twitter , Instagram , Pinterest & Linkedin to get the latest updates or subscribe Here to get latest Engineering Articles in your mailbox. Also, Follow

Check Also

MCB or MCCB - Difference in IEC Standards - IEC 60898-1 & IEC 60947-2

Difference Between MCB & MCCB According To IEC Standards

MCB or MCCB – Difference in IEC Standards (IEC 60898-1 & IEC 60947-2) Circuit breakers …

2 comments

  1. I am facing a problem with Power Factor, that in R and Y Phases its 0.91 and im B phase its very very less 0.18 something is really wrong its an 800KW DGset. What might be the causes? <br />

Leave a Reply

Your email address will not be published. Required fields are marked *