At Kalpa Electrikal Pvt Ltd, casting method of these transformers is obtained with the combined action of vacuum and temperature. The casting method makes it possible to assure void-free epoxy penetration of both the inner layer and between turn insulation. These Transformers are specifically needed in the distribution network for feeding basements or stilts of high-rise buildings, hotels, Malls, stadium, airports, chemical & refinery plants.


Duty Type Outdoor / Indoor , Convertor Duty, Special Type
Voltage Class UPTO 33 kV
No of Phases 1 Phase or 3 Phase
Frequency 50/60 Hz
Capacity UPTO 2.5 MVA
Vector Group Dyn1 or Dyn5 or Dyn11 or any other connection as per customer requirement.
Class of Insulation Class B/F/H with Temp Rise of 70/90/115 Deg C or as per customer requirement.
Tap Changer Off Circuit or On Load.
Tapping Range OCTC or OLTC As Per Customer Requirements
Winding Material Copper
Applicable Standards IS 11171, IEC 60076
Painting Painting : Powder Coated with RAL 7032 Shade or As Per Customer Requrement
Degree of protection IP 23,43 or As Per customer requirement.
Duty Type Outdoor/Indoor, Convertor Duty, Special Type


  • Windings are electrically balanced to minimize axial short circuit forces.
  • Coils are held rigidly in place between insulators clamped to the upper and lower core frames under highcompression.
  • Precise casting under vacuum ensuring low partial discharge.
  • Smooth surface finish and robust construction of MV & LVcastCoils.
  • Adequate ducts between coils, discs for maximum airflowand reducedhotspotTemperature.
  • Step-lap designed CRGO laminations for lower losses and excitationcurrent.


  • H.V. Cable box.
  • L.V. Cable box with bus bar or bus duct
  • Off circuit tap links.
  • Undercarriage with four Bi-directional rollers.
  • Earthing terminals.
  • Rating and diagram plate.
  • Lifting lugs for complete Transformer
  • Tapping link operation door
  • Enclosure with louvre panels
  • Canopy
  • Base channel – 2 Nos
  • The separate neutral bushing on LV side
  • Paint: Powder coated With RAL7032 Shade


  • RTD with A/T contact.
  • Marshaling box with control wiring.
  • On Load tap changer.
  • Forced Cooling arrangement.
  • Neutral Current Transformer.


  • Environment-Friendly.
  • Fire Resistance.
  • Non-Hygroscopic.

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