Transformer

• By electro magnetic induction

  How do transformers work
• When an alternating EMF in a coil causes another alternating EMF in another coil


  How is mutual induction caused
• Primary Current

  Primary Voltage


  What is Ip and Vp
• Secondary Current

  Secondary Voltage


  What is Is and Vs
• it doesn't matter as long as the sum is equal the wattage of the other side of the equation


  What about the split doesn't matter
• KVA(Kilovolt - amps)


  What does KVA mean
• It determines the current that a transformer can deliver load without overheating

  What is KVA
• The rating is the same for both Primary and Secondary


  What are the ratings for KVA
• Vp x Ip = Vs x Is


  What is the formula for transformer rating
• Used for power application


  What are iron-core used for
• Can 'step-up OR 'step-down' an input voltage - depending on number of windings on secondary coil compared to primary


  What can the iron-core do
• It consist of: copper coils wrapped around a silicon iron core


  What does the iron-core consist of
• It must be cooled


  How does the iron-core maintain efficiency and reduce losses
• • Three-phase pole-mounted transformer
  • Miniature control transformer
  • Three-phase power transformer
  • Site transformer
  • Etc

  The types of transformers
• • Delta/Delta
  • Delta/Star


  What two forms provide power applications
• Delta/Delta three-phase 3 wire system


  What does Transmission use
• What does Distribution use

  Delta/Star three-phase 4-wire system
• • Core type
  • Shell type
  • Auto type


  What are the transformer types
• • Hysteresis loss
  • Flux Leak


  What are the transformer losses in Iron loss
• • Heat
  • Eddy current


  What are the transformer losses in Copper loss
• The transformer /formula

  • Vp/Vs = Np/NS = Is/Ip
• What does Np and Ns mean


  Primary Winding and Secondary Winding