Transformer INFO

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1. Distribution Transformer  Standard Ratings :

Distribution Transformer
  • 25 Kva      
  • 63 Kva
  • 100 Kva
  • 200 Kva
  • 315 Kva
  • 500 Kva
  • 750 Kva
  • 1000 Kva
  • 1250 Kva
  • 1500 Kva
  • 2000 Kva
  • 2500 Kva
  • 3000 Kva
  • 3500 Kva

2. Transformer Manufacturers :

  • Kirloskar Electric 
  • Vijai Electricals
  • Volt Amp
  • Crompton Greaves
  • ABB
  • Siemens
  • Pete 
3. Transformer Protection :
  1.  Overload , Overcurrent , Short- circuit .
  2.   Earth Fault .
  3.  Differential Protection .
  4.  Restricted Earth Fault .
  5.  Gas Detection .
  6.  Over voltage , Under Frequency .
  7.  Pressure Relief Device .
4. Transformer Core  :
  • CRGO  Material 
  • Amorphous Material 

  • Mostly  Amorphous core Material is used in T/F  because 
  1. Reduces Core Losses , Magnetization losses
  2.  Total No load losses reduced By by 3% of full load losses.
  3. transformer Noise & Vibration reduced .
5. Transformer Oil  :
  • Mineral oil which is free from fatty acids are used in transformer 
  • Chemical name is Hydrotreated Light Nepthanic Distillate.
  • low viscosity oil
  • flash point at 140 degree centigrade .

6. Transformer Sizing   :

T/F SIZE =   Connected Load  X   Load factor 

Efficiency X  Power factor X  T/f loading











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