Industrial Power Transformers (1 MVA to 25 MVA, Up to 66 kV)
Volta Transformers designs and manufactures robust, high-performance Oil-Immersed Power Transformers up to 25 MVA capacity and 66 kV class. Engineered to handle intense electrical stresses in heavy utility transmission lines, power stations, and major industrial complexes, our units ensure maximum thermal efficiency, low dielectric loss, and uninterrupted grid stability.
Technical Specifications & Engineering Standards
Our engineering team adheres strictly to international standard benchmarks including IEC 60076, IS 2026, IS 1180, and ANSI/IEEE C57. Each transformer is manufactured utilizing premier grade Cold-Rolled Grain-Oriented (CRGO) silicon steel core laminations and 99.9% pure electrolytic grade copper windings.
| Parameter Specification | Standard Engineering Range |
|---|---|
| Rated Power Capacity | 1 MVA up to 25 MVA (Custom heavy-duty ratings available) |
| Primary Voltage Class | 11 kV, 22 kV, 33 kV, 66 kV, 69 kV |
| Secondary Voltage Class | 1.1 kV, 2.2 kV, 3.3 kV, 6.6 kV, 6.9 kV, 11 kV, 13.8 kV, 15 kV |
| Cooling Mechanism | ONAN, ONAF, OFAF, ONWF, OFWF |
| Tapping Options | Off-Circuit Tap Changer (OCTC) / On-Load Tap Changer (OLTC) with RTCC |
| Frequency | 50 Hz / 60 Hz (Export Ready for Global Power Grids) |
| Insulation Class & Liquid | Class A / Dehydrated Mineral Oil or Bio-Degradable Synthetic Ester Oil |
| Standard Compliance | IEC 60076, IS 2026, ISO 9001:2015, BIS Certified |
Key Engineering Features & Structural Advantages
To withstand extreme short-circuit electrodynamic forces and severe overvoltage surges, Volta power transformers integrate advanced protective design choices:
High Voltage & Dielectric Strength
Specialized insulation barrier design and vacuum pressure impregnation ensure high BIL (Basic Impulse Insulation Level) ratings for transmission grids.
Low Loss CRGO Core Assembly
Step-lap mitred core construction minimizes magnetic flux leakage, reducing no-load losses and operational noise levels significantly.
Advanced Cooling Radiators
High-efficiency corrugated panels or pressed-steel detachable radiators configured with ONAN/ONAF forced cooling fans for peak temperature management.
Protective & Safety Devices
Fully equipped with Buchholz relays, Magnetic Oil Level Gauges (MOG), Pressure Relief Devices (PRD), and Winding & Oil Temperature Indicators (WTI/OTI).
Target Industries & Heavy-Duty Applications
Engineered for endurance in demanding operational environments across international industrial sectors:
- Electrical Transmission & Substation Grids: Main step-up/step-down power transmission nodes for public and private utilities.
- Renewable Energy Installations: Centralized pooling stations for large-scale Solar PV and Wind Generation Farms.
- Heavy Metal & Process Industries: Continuous power supply for Steel Mills, Aluminum Smelters, and Foundries.
- Mining, Refineries & Petrochemicals: Flameproof, heavy-duty substations operating under harsh environmental conditions.
- Infrastructure & EPC Projects: Power supply infrastructure for railways, cement plants, and large commercial industrial zones.
Quality Assurance & Factory Acceptance Testing (FAT)
Quality and reliability are guaranteed through rigorous quality controls under our ISO 9001:2015 Quality Management System. Every transformer manufactured at our Vadodara, Gujarat plant undergoes 100% comprehensive routine testing in accordance with IEC 60076 prior to dispatch, including:
- Measurement of winding resistance & voltage vector phase relationship
- Measurement of no-load loss, no-load current, and load loss at rated frequency
- Separate-source AC withstand voltage test & Induced overvoltage withstand test
- Insulation resistance (MEGGER) & Dissolved Gas Analysis (DGA) for transformer oil
- Type tests including Lightning Impulse Voltage Test and Temperature Rise Test available upon client request.
Why Overseas Procurement Managers Partner with Volta
With over 15 years of manufacturing heritage under the Pooja Group of Industries, Volta Transformers delivers high-reliability transformers worldwide with customized engineering solutions, robust export-grade sea packing, and comprehensive engineering support from design review to site commissioning.
Need Custom Specifications for Your Project?
Our engineering team can customize power transformers to meet your specific grid voltage, tapping, and structural requirements.
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