What is 3-Phase? What Is The Difference Between 1-Phase & 3-Phase?

Replies

• 

  hsirah5

  Hi,
  I hope your question is on 1 phase and 3 phase power and not on loads that run on 1 phase or 3 phase.
  
  Basically single phase supply is sufficient for supplying domestic appliances and motors whereas 3-phase power is needed for heavier loads.
  
  The single phase power is generated by 1 coil and which produces the sinusoidal voltage.
  
  The 3 phase power is generated by 3 coils (which are in Star or Delta connection) with 120 degree shift between them. The individual coils reach their peak value at the rate of 1/3 rd of the time period in a sequence. Since there are 3 phases of current and voltage generation, the total power delivered is higher.
  
• 

  sreeraghuma

  thank you i got it the explanation
  but where the 3 phase line is normally used and why it being preferred?😀
• 

  hsirah5

  Sreeraghuma,
  3-phase line can be used anywhere, for domestic as well as industrial, but mostly it is essential for industrial loads which consume more power for a given phase voltage.
  In the case of domestic buildings like homes and offices, it would be useful when we need less interrupted power supply. And you can obviously understand that 3-phase power is expensive and is less economical option in case of domestic areas.
  
  Most common example, which you would have easily observed, is during a power-cut to houses connected to the same electric line. During electric power-cuts in a single phase, you might have observed that some houses connected to the same line would be experiencing the power-cut while some don't. The reason they don't experience a power-cut is because
  the house may be availing a 3-phase power and hence powered by other two phases
  (or)
  the house may be availing a single phase other than the one phase in which the failure has occurred.
  
  Hence it is your choice to opt for 3 phase depending upon your need and cost factor.
  
  Hope I have answered your question. 👍Let me know for further clarifications...😎