Substation Class
69kV 33kV 10MVA 20MVA 30MVA ONAN Copper Oil Immersed Power Transformer for Substation Step Down
10MVA - 30MVA
Up to 69kV
ONAN/ONAF
Precision-engineered oil-immersed and cast resin dry-type transformers compliant with IEC 60076, EN 50588-1, and EU EcoDesign Regulation 2019/1783.
Why high-purity Oxygen-Free High-Conductivity (OFHC) and Electrolytic Tough Pitch (ETP) copper windings dictate grid longevity across the Iberian Peninsula.
In high-density industrial corridors and expanding solar regions across Portugal, electrical transformers are subjected to continuous thermal cycling, transient overvoltages, and non-linear harmonic loads. The choice of winding material is the fundamental determinant of electrical efficiency, thermal dissipation, and short-circuit withstand capabilities.
As a specialized supplier exporting engineered transformers to European markets, our manufacturing process utilizes strictly 99.99% pure ETP grade copper (EN 13601 certified) for wire and foil conductors. Compared to aluminium alternatives, copper provides a 60% higher electrical conductivity index, reducing internal $I^2R$ load losses and minimizing localized hot-spot temperature rise within the transformer core-coil assembly.
Comparative analysis under IEC 60076-5 short-circuit withstand and thermal loading stress tests:
Tailored transformer solutions addressing geographical, climatic, and industrial grid requirements from the Algarve coast to Porto's manufacturing zones.
Distribution grid operators across Portugal (including E-Redes medium-voltage infrastructure) demand high-reliability step-down transformers (20kV to 0.4kV and 30kV to 0.4kV). Our ONAN copper-wound oil transformers feature hermetic sealing or conservator tanks with corrugated walls, ensuring maintenance-free performance under rural and suburban loading conditions.
Portugal’s southern solar corridor experiences extreme summer ambient temperatures alongside severe harmonic distortion from central utility inverters. Our solar inverter-duty copper transformers incorporate electrostatic shielding between windings, K-factor harmonic rating, and multi-winding configurations designed to handle cyclic solar loading without thermal deterioration.
Industrial operations situated in coastal deepwater ports (Port of Sines, Leixões, Setúbal) face aggressive salt-spray corrosion (Class C5-M atmospheric rating). We engineer custom transformers with hot-dip galvanized tanks, stainless steel hardware, polyurethane C5-M paint systems, and C3/C4 insulation class cast resin components.
Indoor installations within financial districts, hospitals, and cloud computing data hubs demand maximum fire safety and acoustic dampening. Our Cast Resin Dry-Type (SCB series) copper transformers carry F1 (Fire Risk), E2 (Environmental), and C2 (Climatic) international certifications, featuring self-extinguishing epoxy resin and operating noise levels under 45 dB.
From steel processing in Aveiro to pulp and paper mills in Figueira da Foz, heavy industry demands high-current step-down transformers capable of resisting severe load spikes and voltage sags. Our copper foil winding technology eliminates axial short-circuit forces, preventing mechanical deformation under sudden load rejection.
As Portugal establishes its flagship green hydrogen hub in Sines, specialized low-voltage, high-current isolation transformers are essential to power megawatt-scale electrolyzer stacks. Our custom phase-shifting isolation transformers optimize multi-pulse rectifier operations, suppressing grid-side harmonic feedback.
Analyzing macroeconomic policies, decarbonization mandates, and renewable integration driving transformer procurement across Portugal.
Portugal’s updated National Energy and Climate Plan targets 85% renewable electricity generation by 2030. This expansion requires upgrading legacy step-up substations with eco-efficient copper transformers capable of handling bi-directional power flow.
With floating offshore wind auctions scheduled off Viana do Castelo, Figueira da Foz, and Ericeira, high-voltage offshore and coastal tie-in substations require specialized C5-M moisture-resistant transformer enclosures.
Decarbonization grants under Portugal's Recovery and Resilience Plan (PRR) are accelerating fossil-fuel-to-electric conversions in chemical, glass, and ceramics industries, driving demand for heavy-duty isolation transformers.
Enforcement of Regulation (EU) 2019/1783 makes low-loss transformers mandatory for all EU installations. High-conductivity ETP copper core-coil assemblies provide the necessary loss reduction margin.
Standard parameters for custom-engineered copper power and distribution units exported to Portugal and the European Union.
| Transformer Class | Rating Range | Voltage Classes | Vector Groups | Winding Conductor | Compliance Standards |
|---|---|---|---|---|---|
| Oil-Immersed Distribution | 50 kVA – 3,150 kVA | 10 kV, 15 kV, 20 kV, 30 kV / 0.4 kV | Dyn11, Dyn5, Yyn0 | 99.99% ETP Copper Foil / Wire | IEC 60076, EN 50588-1, EU 2019/1783 |
| Cast Resin Dry-Type | 100 kVA – 4,500 kVA | 6 kV, 10 kV, 15 kV, 20 kV / 0.4 kV | Dyn11, Yyn0 | Electrolytic Copper Foil | IEC 60076-11, CE Class F1/E2/C2 |
| Solar Inverter Step-Up | 1,000 kVA – 6,300 kVA | 0.6 kV, 0.8 kV to 20 kV, 30 kV | Dy11y11, Dy11 | OFHC Copper with Shielding | IEC 60076-16, Harmonics Rated |
| Substation Power Transformers | 5 MVA – 30 MVA | 30 kV, 60 kV, 69 kV / MV Step-Down | YNd11, YNyn0 | Continuous Transposed Copper (CTC) | IEC 60076 Series, ISO 9001 |
| Industrial Isolation | 15 kVA – 630 kVA | 220V, 380V, 415V, 480V | Dyn11, Dzn0 | Copper Wire / Double Insulated | CE Marked, Low Noise Class |
Established in 2004 in Rajkot, Gujarat, India, Synergy Transformers Pvt. Ltd. operates a modern 103,500+ sq. ft. manufacturing facility dedicated to global power equipment supply.
Our vertically integrated plant handles every critical step of transformer production in-house under strict ISO 9001:2015, ISO 14001, and ISO 45001 quality management systems. From precision CRGO core slitting and automated copper foil winding to structural tank fabrication, shot blasting, and high-vacuum oil filling, our quality control guarantees robust performance in field conditions.
Eliminates axial short-circuit forces and lowers internal hot-spot gradients.
100% routine testing including routine loss, turns ratio, and high-voltage withstand.
Every unit produced for European export undergoes thorough testing witnessed by third-party inspection agencies (TÜV, SGS, Bureau Veritas, or customer-appointed consultants):
Addressing key questions from engineering consultants, EPC contractors, and utility procurement officers in Portugal.
Our engineering team designs core-coil assemblies specifically to meet or exceed the maximum allowed no-load ($P_0$) and load losses ($P_k$) defined under EU Tier 2. We use high-grade, laser-scribed grain-oriented silicon steel (CRGO) for the magnetic core combined with 99.99% ETP electrolytic copper windings, ensuring optimal energy ratings and lower total cost of ownership (TCO) across the unit's operating life.
We supply standard Portuguese primary and secondary distribution voltage ratios, including 30 kV / 0.4 kV, 20 kV / 0.4 kV, 15 kV / 0.4 kV, and 10 kV / 0.4 kV at 50 Hz. We also customize multi-tapped primary transformers with Off-Circuit Tap Changers (OCTC) or On-Load Tap Changers (OLTC) with ranges like ±2×2.5% or ±5% to handle grid voltage fluctuations in remote industrial and solar sites.
For high-salinity coastal environments (classified under ISO 12944 as C4 or C5-M marine exposure), transformer tanks undergo full automated shot-blasting to Sa 2.5 standard. We apply a multi-coat system consisting of a zinc-rich epoxy primer, an intermediate epoxy tie coat, and a polyurethane topcoat with a minimum total dry film thickness (DFT) of 240 microns. Stainless steel hardware (A4/316 grade) and outdoor anti-UV bushings are supplied standard.
Every shipment comes with a complete technical dossier including: CE Declaration of Conformity, Routine Test Reports signed by QA engineers, Factory Acceptance Test (FAT) certificates, General Arrangement (GA) dimensional drawings, Guaranteed Technical Particulars (GTP), Bill of Lading, Certificate of Origin, and detailed O&M manuals in English (Portuguese available upon request).
Standard distribution transformers are manufactured in 3 to 5 weeks following drawing approval, while custom substation power units require 6 to 8 weeks. Transit time for containerized (FCL/LCL) or seaworthy flat-rack shipping from major Indian export ports to the Port of Sines or Port of Leixões ranges between 22 and 28 days under CIF/DDP terms.
Yes. We welcome customer engineers and third-party inspectors (such as SGS, TÜV, Bureau Veritas) to witness live routine tests at our Rajkot facility. Alternatively, we offer high-definition video-streamed live FAT sessions where real-time meter readings, ratio tests, and loss measurements are audited transparently.
Contact our pre-sales engineering team today for technical advice, drawing reviews, and competitive pricing for distribution and power transformers.