Oil cooled transformers
High performance oil cooled transformers engineered for efficiency, built for durability, designed to power industries and cities — today and tomorrow.
Up to 16 MVA · Up to 33 kV
High performance oil cooled transformers engineered for efficiency, built for durability, designed to power industries and cities — today and tomorrow.
Typical applications
Engineered for efficiency. Built for durability.
Low losses
Optimised design for minimum energy losses.
High efficiency
Superior efficiency for better performance.
Superior cooling
Effective cooling for longer life and reliability.
Reliable performance
Engineered for durability and continuous operation.
Easy maintenance
User-friendly design for quick inspection and serviceability.
Every component engineered to last
- Buchholz relay
- Detects internal faults and gas accumulation in the transformer.
- HV bushings
- High voltage bushings for external connections.
- Breather
- Silica gel breather absorbs moisture from incoming air.
- Radiator
- Cooling fins that dissipate heat and cool the oil.
- Tank
- Main tank filled with transformer oil, core and windings.
- OLTC
- On load tap changer for live voltage regulation.
Specifications at a glance
Technical specifications
| Rating (as per BIS standard) | Up to 2.5 MVA |
|---|---|
| Rating (as per IS 2026 standard) | Up to 16 MVA |
| Voltage class | Up to 33 kV |
| Cooling type | ONAN / ONAF |
| Frequency | 50 Hz |
| Winding material | Copper / Aluminium |
| Insulation level | As per IS / IEC standards |
| Core material | CRGO silicon steel |
|---|---|
| Vector group | Dyn11 / YNd11 / other on request |
| Impedance | As per IS / IEC standards |
| Oil type | Mineral oil, PCB < 2 ppm |
| Tap changer | OCTC or OLTC |
| Standard compliance | IS 1180 (BIS standard) or IS 2026 |
Precision in every process
Precision core stacking
High-grade CRGO sheets cut with precision for lower losses and higher efficiency.
Automated coil winding
Computerised winding machines ensure consistent quality and reliability.
Moisture drying process
Moisture-free insulation for enhanced dielectric strength and long life.
Controlled oil filling
Vacuum oil filling under controlled conditions ensures superior insulation.
Advanced quality control
Every stage is monitored and verified to meet national & international standards.
Rigorous testing. Assured performance.
All transformers are tested as per IS 1180 & IEC 60076 standards.
- Measurement of winding resistance
- Voltage ratio, polarity & vector group test
- No load loss & no load current test
- Load loss & impedance voltage test
- Applied voltage withstand test
- Induced over voltage withstand test
- Insulation resistance (IR) test
- Oil BDV test
- Magnetic balance test
- Functional checks on accessories
From the shop floor
Need oil cooled? Send us your specification.
Share your single line diagram, rating or load list and our engineering team will revert with a technical offer.