Phone : +91-9829059997, 9828559997

Distribution Transformer


Technical Specification


Standard All transformers are designed manufactured and tested as per IS-1180 & IS-2026 (or any other prevailing standard)
Capacity 16 KVA to 2500 KVA
Rated Voltage HV : 33 KV, 11 KV , 6.6 KV or 3.3 KV, LV : 11 KV, 6.6 KV, 3.3 KV or 0.433 KV
Cooling Naturally oil cooled (ONAN)
Type Indoor or Outdoor
Conductor Aluminium (up to 500 KVA )/ Copper.
Vector Group Dyn-11 ( or any other group as per requirement)
Connection Terminals LV : Suitable Brass Metal Parts covered with porcelain Bushings up to 400 Kva and Epoxy Moulded Copper Bus - bar type metal part for 500 Kva and above.
Temperature Rise 45 C for oil & 55 C for windings.
Tappings 5 % in steps of 2.5 % (Other ranges also available as per requirement)


Standard Fittings


  • Aluminium plate with transformer details & diagram
  • Oil level indicator ( Flush type )
  • Conservator with oil filling point
  • Drain point with valve & plug
  • Filter point with valve & plug
  • Thermometer pocket
  • Thermometer ( Dial Type )
  • Lifting hooks (4 Nos )
  • Air release plug
  • Silica Gel Breather
  • Explosion vent pipe
  • Mounting channel
  • Earthing Terminals (2 Nos)
  • Radiators ( Fixed Type )
  • LT Cable Box
  • Unidirectional rollers
  • Bus bar arrangement ( above 315 KVA)
  • HT bushings with arcing horns
  • Inspection Window (250 KVA & above )
  • Additional neutral bushings for connecting to separate earth.


Optional Fittings

  • Winding Temperature Indicator (WTI)
  • Oil Temperature Indicator (OTI)
  • Magnetic oil level Gauge (MOG)
  • Buchholz Relay
  • Detachable Radiators
  • Marshalling Box (500 KVA & above )
  • HT Cable Box
  • Off load type tap changing switch ( Externally operated)
  • On Load Tap Changing Switch (OLTC) with Auto Regulator & RTCC.


Transformer Details


All transformers are designed as per customer specific requirement keeping in mind the stringent requirements of prevailing standards to ensure long & trouble free working of the transformer,


Transformer Coils are made from paper covered or super enameled high quality copper or aluminium conductors of EC grade. Windings are done so as to meet all three fundamental requirements i.e. Mechanical, Electrical & Thermal.

Press board washers & spacers rigidly support the winding. Interlayer cooling ducts are provided to ensure that the temperature gradient between winding & oil hense the hot temperature spot is minimized & high life expectancy is achieved.,

Insulation The insulating material is selected keeping in mind electrical mechanical & thermal properties of it. The principle component of insulation is pre-fabricated press board sheet.
Core All Transformers are made with firm interleaved low loss cold rolled grain oriented (CRGO) silicon steel laminations with mitred joint design to ensure low losses, low magnetizing current & low noise. Stamping has insulating material coating on both side which is oil & heat resistant.
Tank All tanks are made from hot rolled mild steel plates which are electrically welded. Suitable stiffeners are provided for robust construction. Sufficient cooling radiators made from pressed steel fins or elliptical tubs are provided to maintain the temperature rise within specified limits. All tanks are pressure tested before painting to ensure zero leakage.
Paint Transformer Tank & all other fabricated items are thoroughly cleaned before painting. The interior of the tank is painted with two coats of oil & heat resistant zinc chromate primer. It is also applied to the tank exterior before applying two coats of weather proof very durable anti corrosive epoxy based synthetic paint.
Oil The oil used for insulation, impregnation and as a coolant complies to IS-335 Every consignment received is throughly tested for all parameters like di-electric strength, acidity, resistivity, flash point etc before use.
Testing Each Transformer is properly tested for all routine tests as per IS : 2026 with best of the available testing panel and meters regularly calibrated from approved labs. Any other specific test can be done on special demand of the customer on initial agreement.
After Sales Service Shakti believes in building relations beyond business so special emphasis is given to quality assuring long and trouble free working of our products. Even then just in case there is any trouble in the unit our expert service engineer is promptly deputed for rectification of the problem. We have a team of highly skilled and well trained expect service engineer at your disposal at all time.