High-Efficiency Power Transformer Manufacturer & Global Exporter
Urja Techniques (India) Pvt. Ltd. is a premier ISO 9001:2015, ISO 14001:2015 certified manufacturer and exporter of heavy-duty Power Transformers based in Mumbai, India. Operating continuously since 1991, we design, engineer, and export power transformers up to 10 MVA in the 33 kV class to utilities, EPC contractors, and industrial plants across 40+ countries.
Built strictly in compliance with IEC 60076 and IS 2026 international standards, our power transformers feature step-lap CRGO core laminations, high-grade electrolytic copper windings, and advanced thermal cooling (ONAN/ONAF). Every unit is engineered for low loss, high dielectric strength, superior acoustic noise reduction, and severe short-circuit withstand capabilities.
Power Transformer Technical Specifications
Customized electrical and mechanical parameters tailored to satisfy international utility and industrial grid standards.
| Rating / Capacity Range | 500 kVA to 10,000 kVA (10 MVA) |
|---|---|
| Primary / Secondary Voltage | 11 kV, 22 kV, 33 kV Class (Step-up / Step-down up to 415V / 433V or custom) |
| Vector Group & Phase | Dyn11, Dyn5, Ynd11 or custom configurations | 3-Phase, 50 Hz / 60 Hz |
| Cooling Mechanism | ONAN (Oil Natural Air Natural) / ONAF (Oil Natural Air Forced) |
| Winding Conductor Material | 100% Electrolytic Copper Wire / Strip (Double Paper Covered / Enamelled) |
| Magnetic Core Type | Cold Rolled Grain Oriented (CRGO) Steel with M4 / Prime grade Step-Lap Mitred Jointing |
| Tap Changer Options | Off-Circuit Tap Changer (OCTC) / On-Load Tap Changer (OLTC) with RTCC panel |
| Operational Temperature Range | -20°C to +85°C (Ambient rating engineered for tropicalized environment) |
| Compliance Standards | IEC 60076, IS 2026, IS 1180, IEEE standards |
| Type Test Credentials | Type tested from NABL accredited labs (CPRI & ERDA) for dielectric strength & short circuit |
Engineered for Long-Term Grid Reliability
Prime CRGO Core Joints
Utilizes step-lap mitred jointing techniques to minimize no-load losses, lower excitation current, and drastically decrease acoustic operational noise.
Short-Circuit Withstand
Rigid, uniform clamping structures and dried insulation coils engineered to absorb maximum electrodynamic forces during network short-circuit events.
Low Operational Losses
Optimized winding geometry and core design cut load and no-load losses in full alignment with global energy efficiency directives.
Vacuum Siccative Drying
Coils undergo thorough vacuum drying and pressure impregnation cycles to remove moisture, increasing dielectric insulation longevity.
Corrosion-Proof Tanking
Heavy-duty steel tanks subjected to shot-blasting, anti-corrosive primer coating, and polyurethane painting for hostile outdoor coastal/mining exposure.
Flexible Tap Changing
Equipped with manual Off-Circuit switches or automatic On-Load Tap Changers (OLTC) complete with remote tap-changer control panels (RTCC).
Heavy-Duty Transformer Range
Designed for step-up transmission, sub-station distribution, and heavy industrial plant duty.
Industrial Power Transformer
Rated from 500 kVA to 5,000 kVA, up to 33kV class. Perfect for industrial power distribution networks requiring 99.9% operating efficiency and high heat dissipation.
Heavy-Duty Power Transformer
Double-wound ONAN cooled transformers compliant with IS 1180 / IEC 60076. Built for factories, processing plants, and severe continuous load cycles.
Special Power Transformer (Up to 10 MVA)
Custom-engineered step-up/step-down units featuring OLTC/OCTC options. Designed for utilities, solar/wind farms, hydro plants, and power substations.
Type-Tested Quality & Independent Laboratory Approvals
At Urja Techniques, quality assurance is integrated into every manufacturing stage. All our power transformers undergo stringent routine tests, type tests, and special tests in our factory and independently at NABL-accredited laboratories including CPRI (Central Power Research Institute) and ERDA (Electrical Research and Development Association).
We are a verified supplier to major State Electricity Boards, EPC contractors, and international industrial conglomerates, delivering tested operational reliability across Africa, the Middle East, Europe, and Asia.