Oil immersed Transformers.
Engineered for utility-scale grids, heavy industry, renewable evacuation and demanding metallurgical duty cycles.
Distribution Transformers
At TransVolt, a distribution transformer is not just equipment, it is the backbone of dependable power delivery. Certified as per IS 1180 (BIS) and designed in accordance with IEC 60076, every unit reflects our commitment to efficiency, durability and compliance. Built around a low-loss step-lap CRGO core and precision copper windings, our transformers are optimised for maximum energy savings and minimum lifetime operating cost.
Technical Specifications
- Rated Power Range
- 100 kVA to 5000 kVA
- Voltage Class
- HV: 11 / 22 / 33 kV - LV: 415 / 433 / 690 V
- Frequency
- 50 Hz / 60 Hz
- Vector Group
- Dyn11 (Standard), Dyn5, Ynd11, or as per requirement
- Impedance
- 4.0% to 5.0% (per IS 1180 / IEC 60076)
- Tapping Range
- OCTC: ±2.5% to ±5% - OLTC: +5% to -15%
Applications
- Urban distribution networks
- Rural electrification
- Industrial estates
- Commercial complexes
Detailed Product Specifications
Construction, materials, protection and testing details for Distribution Transformers.
Core Construction
- High-grade Cold Rolled Grain Oriented (CRGO) silicon steel - M4 / M5 / Hi-B grades
- Step-lap mitred core construction for minimised no-load losses
- Lamination thickness: 0.23 mm / 0.27 mm / 0.30 mm
- Operating flux density: 1.55 – 1.65 Tesla
- Bonded yoke clamps with non-magnetic flitch plates to control hot spots
Power Transformers
Our Power Transformer series represents the pinnacle of high-capacity engineering for utility-scale transmission networks and heavy industrial primary substations. Designed for step-up and step-down applications across high-voltage grids, these transformers serve as the critical interface between power generation facilities and regional distribution infrastructure. Engineered in compliance with IEC 60076, optimised for maximum efficiency under near-full load conditions, with engineered service life of 25–30 years or more.
Technical Specifications
- Rated Power Range
- 5 MVA to 50 MVA (Standard) / Up to 100 MVA (Project Specific)
- Voltage Class
- Up to 132 kV Class
- Frequency
- 50 Hz / 60 Hz
- Cooling
- ONAN / ONAF / OFAF
- Service Life
- 25 – 30 years engineered
- Standards
- IEC 60076 & applicable national standards
Applications
- Utility transmission substations
- Heavy industrial primary substations
- Generation step-up applications
- Refineries & cement plants
Detailed Product Specifications
Construction, materials, protection and testing details for Power Transformers.
Core Construction
- Premium Hi-B / Domain Refined CRGO silicon steel
- Five-limb / three-limb step-lap mitred construction
- Lamination thickness 0.23 mm - laser-scribed for minimum loss
- Flux density designed at 1.55 – 1.60 T for low excitation current
- Continuously transposed conductor (CTC) compatible core windows
Solar & Wind Inverter Duty Transformers
The TransVolt Solar & Wind Series is a specialised range of converter-duty transformers engineered for solar PV and wind power plants. These transformers step up the low-voltage AC output from inverters to medium-voltage grid levels, ensuring stable and efficient evacuation of renewable energy. Built to handle high-frequency switching, elevated harmonic distortion (THD) and fluctuating load conditions typical of renewable installations.
Technical Specifications
- Rated Power Range
- 500 kVA to 15 MVA (Standard) / Up to 20 MVA (Project Specific)
- Voltage Class
- HV: Up to 33 kV - LV: 0.400 V to 800 V
- Frequency
- 50 Hz / 60 Hz
- Vector Group
- Dy11Y11, Dy11, Y11y11, Dy11y11y11 (Multi-winding)
- Impedance
- Min 5.75% (Customised to inverter SC capacity)
- Standards
- IEC 60076
Applications
- Utility-scale solar PV plants
- Wind power plants
- Hybrid renewable parks
- Captive renewable generation
Detailed Product Specifications
Construction, materials, protection and testing details for Solar & Wind Inverter Duty Transformers.
Core Construction
- Low-loss CRGO step-lap core - Hi-B grade
- Designed at lower flux density (≤1.55 T) for harmonic headroom
- Lamination 0.23 / 0.27 mm, controlled burr & insulation coating
- Magnetic shunts on tank wall to control stray-flux losses
Furnace Transformers
The TransVolt Furnace Series is purpose-built for the most demanding electrical environments in the metallurgical and chemical industries. Designed to withstand brutal duty cycles of arc and induction furnaces - high secondary currents, frequent tap changes and severe short-circuit conditions, with reinforced winding bracing and forced cooling options.
Technical Specifications
- Rated Power Range
- Up to 30 MVA (Project Specific)
- Secondary Current
- Designed for very high LV currents
- Tap Range
- Wide regulation, OLTC compatible
- Cooling
- ONAN / ONAF / OFAF
- Construction
- Reinforced bracing for SC withstand
Applications
- Electric arc furnaces
- Induction furnaces
- Steel melt shops & foundries
- Chemical & electrolysis plants
Detailed Product Specifications
Construction, materials, protection and testing details for Furnace Transformers.
Core Construction
- Heavy-duty CRGO core engineered for high cyclic flux variation
- Step-lap mitred construction with reinforced clamping
- Lower flux density to absorb voltage swings during arc operation
- Special shielding to control stray flux at high LV currents
Compact Secondary Substations (CSS)
The TransVolt Compact Secondary Substation (CSS) - also known as a Packaged or Unitised Substation - is a factory assembled, pre-tested and ready-to-install power distribution solution. Ideal for urban rollouts where space is limited and aesthetics matter, integrating HV switchgear, transformer and LV distribution in a single weatherproof enclosure.
Technical Specifications
- Configuration
- HV switchgear + Transformer + LV distribution
- Enclosure
- IP54 weatherproof, sheet steel / GRP
- Transformer Rating
- Up to 2500 kVA
- HV Side
- Ring Main Unit (RMU) options
- Compliance
- IEC 62271-202
Applications
- Smart cities
- Townships, malls & commercial complexes
- Metro & airport projects
- Renewable interconnection points
Detailed Product Specifications
Construction, materials, protection and testing details for Compact Secondary Substations (CSS).
Core Construction
- Internal distribution transformer with CRGO step-lap core
- Designed for low losses and quiet operation in urban environments
- Integrated within a thermally optimised enclosure compartment
Need a custom specification?
Our engineers design transformers to your exact rating, voltage class and application.
Talk to an Engineer