SRI ® Make Oil cooled Distribution Transformers << Back

Distribution transformers are used in the last leg of Power distribution to feed electricity to residential, industrial and bulk consumers. Transformers with primary voltage of 11 kV and below are termed as Distribution Transformers. We at Shri Ram Group Of Industries have a huge integrated facility to manufacture Oil cooled Distribution Transformers.

  • Technical Specifications
  • Salient Features
  • Standard Fittings
  • Optional Fittings

Technical Specifications

Rating Upto 1 mVA
Duty Type Outdoor/Indoor, Pole or Ground Mounted
Voltage Class 3.3,6.6,11,22,33 kV or any specific
No Of  Phases 1 or 3 phase
Frequency 50/60 Hz
Vector Group Dyn1 or Dyn5 or Drn11 or any specific
Insulating Fluid PCB FREE Mineral Oil, both inhibited & uninhibited, as per IS/IEC and customer requirement
Class Of Insulation Class A
Tap Changer Off Circuit or On Load
Tapping Range + 2.5% X 2 for OCTC or + 1.25% X 4 & -1.25% X 8 for OLTC or as per customer requirement
Winding Material Aluminium Or Copper with multi paper covering
Applicable Standards IS 2006,IEC76,ANSI,IEEE
Painting Enamel, Epoxy, Polyurethane, 10 Tank Powder Coating or customer specific
Tank Hermetically Sealed, Corrugated Radiator Type or Conventional rectangular tank type

Salient Features of SRI ® Make Oil cooled Distribution Transformers

Custom made to meet each and every requirement of customers conforming to National & international Standards.
Designed by experienced expert engineers using most modern software.
Highest dielectric insulation property to withstand Lightening Impulse.
Step lap core design with multiple sheets per bag used in the core lamination jointing.
Designed using advanced software like AutoCAD &ProE to ensure adherence to the design parameters.
Pre composed Insulation material for minimal moisture absorption.
In House Fabrication with Laser and CNC machines.
Integrated 10-Tank Powder coating process.
Facility to make 1000 Nos Transformers per month.


H.V. Bushing L.V Bushing Off Circuit Tap Changer
Conservator oil filling hole with cap & drain plug Under carriage with four bi-directional rollers Earthing terminals
Drain cum bottom filter valve with sampling plug Top filter valve with sampling plug Plain Oil Level gauge
Rating diagram plate Air release device Thermometer Pocket
Lifting Lugs Pressed Steel Radiators (Fins or corrugated type) Double Diaphragm Explosion Vent
Silica gel breather Additional Neutral bushing First filling of oil

Optional Fittings

Detachable Radiators with isolating valves. Jacking Pads Dial Type Oil Temperature Indicator with A/T contacts
Buchholz relay with A/T contacts Marshalling box with control wiring Equaliser pipe between conservator & explosion vent
On Load Tap Changer RTCC Panel with automatic voltage Regulator (AVR) Pressure Release Valve
DGPT Relay