69kV 33kV 10MVA 20MVA 30MVA ONAN Power Transformer
Up to 30 MVA
69kV / 33kV
ONAN Cooling
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Explore our certified range of oil-immersed power transformers, cast resin dry-type transformers, and custom isolation units engineered to IEC 60076 standards.
Strategic analysis of grid modernization, renewable energy integration (UTE framework), and why Chinese high-precision aluminum winding technology is dominating Latin American imports.
Uruguay stands as a global leader in renewable energy transition, with over 95% of its electricity generated from hydroelectricity, wind farms, and solar PV installations. The national utility company, UTE (Administración Nacional de Usinas y Trasmisiones Eléctricas), enforces rigorous standards (such as ET-301) for equipment connected to the national grid operating at 50 Hz. Procurement teams require transformers and coil assemblies that maintain high efficiency under dynamic loading, low noise emissions, and compliance with IEC 60076 standards. China's top aluminum winding manufacturing plants provide custom step-up and step-down solutions perfectly matched to Uruguay's 15kV, 30kV, and 110kV distribution network nodes.
Rising global copper prices have driven engineering consultants in Montevideo, Canelones, and San José to adopt advanced EC-grade (Electrical Conductor) aluminum foil and wire winding. Modern aluminum foil winding eliminates internal mechanical stress gaps, reduces hot-spot temperature rise, and achieves equivalent thermal performance to copper at a 30% to 40% reduction in total weight and unit cost. For Uruguayan EPC contractors importing through the Port of Montevideo, reduced freight weights combined with competitive NCM tariff treatments under MERCOSUR import mechanisms offer unparalleled Total Cost of Ownership (TCO) advantages.
Information Gain Key Insight for Uruguayan Buyers: Modern EC-grade aluminum foil (AA1350/AA8011) paired with continuous automated foil winding machines removes human error in transposition. It achieves full mechanical symmetry against electromagnetic short-circuit stress—a critical requirement for remote substations across Tacuarembó, Salto, and Rivera where grid short-circuit levels fluctuate during peak agricultural cycles.
Deep dive into metallurgy, electrical conductivity, short-circuit force distribution, and bimetallic connection integrity for transformer buyers.
When evaluating transformer suppliers in China for Uruguay export projects, electrical engineers evaluate two primary winding geometries: conventional round wire winding and continuous foil winding. Aluminum foil winding represents a generational leap in transformer reliability, particularly for cast resin dry-type transformers (SCB series) and medium-voltage oil-immersed distribution units.
In traditional wire-wound coils, short-circuit conditions generate severe axial mechanical forces due to coil height mismatches between HV and LV windings. Aluminum foil winding spans the entire axial height of the coil. The current flows in a uniform sheet, virtually eliminating axial mechanical stress and preventing axial coil collapse during external grid fault events.
Aluminum foil coils feature a significantly larger surface-area-to-volume ratio compared to thick copper conductors. Cooling air or insulating oil flows directly over each layer's edge, eliminating localized "hot spots." This uniform heat distribution slows thermal degradation of Nomex or epoxy insulation, extending operational lifespan past 30 years in humid South American climates.
A historic challenge with aluminum conductors was joint oxidation. Modern Chinese top-tier factories utilize automated ultrasonic cold welding and bimetallic copper-aluminum (Cu-Al) transition busbars under inert argon gas shielding. This eliminates galvanic corrosion risk at terminal connections, ensuring zero contact resistance escalation over decades of operation.
Tailored transformer solutions engineered for specific regional industrial sectors, utility nodes, and climatic conditions.
Primary Voltage: 15kV / 30kV | Secondary Voltage: 0.4kV / 0.23kV
Deploying ONAN hermetically sealed oil-immersed distribution transformers with aluminum foil low-voltage windings across urban grid feeds in Montevideo and Canelones. Hermetic sealing prevents ambient moisture ingestion, preserving dielectric oil breakdown voltage (>60 kV) in coastal zones with high relative humidity.
Application: Solar Inverter Step-Up Transformers (Salto & Rivera)
Multi-winding cast resin dry-type transformers (1250kVA - 4500kVA) designed for dynamic solar inverter outputs. Built to withstand high harmonic distortion (K-Factor 13+) and severe solar cyclic loading without insulation overheating or partial discharge (<5 pC rating).
Application: Indoor Compact Substations & Dry-Type Isolation
Self-extinguishing dry-type epoxy resin transformers (SCB series) installed inside free zone parks (Zonamerica, WTC Free Zone, Fray Bentos). Compliant with IEC 60076-11 Class F1 (fire risk), E2 (environmental condensation), and C2 (climatic resistance down to -25°C).
Application: Heavy Motor Step-Down & Pulp Mill Duty
Sturdy isolation transformers (100kVA to 3150kVA) tailored for timber processing, rice mills, and dairy facilities across Paysandú and Durazno. Features reinforced tank structures and C4-H grade anti-corrosion paint coatings to resist chemical washdowns and outdoor exposure.
Comprehensive technical parameters for engineering review and tender evaluation.
| Transformer Parameter | Oil-Immersed Distribution Type | Cast Resin Dry-Type (SCB) | High-Power Substation Unit |
|---|---|---|---|
| Rated Capacity Range | 16 kVA - 3,150 kVA | 100 kVA - 4,500 kVA | 5,000 kVA - 30,000 kVA (30 MVA) |
| HV Voltage Rating (50 Hz) | 6.3 kV, 10 kV, 15 kV, 30 kV | 11 kV, 13.2 kV, 15 kV, 20 kV | 33 kV, 69 kV, 110 kV |
| LV Voltage Rating | 400V / 230V, 380V | 400V / 230V, 415V | 6.3 kV, 10.5 kV, 13.8 kV |
| LV Winding Material | EC-Grade Aluminum Foil / Copper | High-Purity Aluminum Foil | Continuously Transposed Copper / Foil |
| Core Material Grade | High-Permeability CRGO Silicon Steel | Laser-Scribed Domain Refined CRGO | Step-Lap Laminated CRGO Steel |
| Insulation Class & Temp Rise | Class A (60K Winding Rise) | Class F / H (100K Winding Rise) | Class A / Class B Option |
| Standards Compliance | IEC 60076, IS 1180, UTE ET-301 | IEC 60076-11, CE, ISO 9001 | IEC 60076 Series, ISO 14001 |
| Protection Level / Enclosure | IP54 / Hermetically Sealed Tank | IP00 (Indoor), IP23 / IP54 Kiosk | ONAN / ONAF Radiator Assembly |
Direct insight into our 103,500+ sq. ft. plant infrastructure, quality management system, and export compliance.
From precision laser cutting of high-permeability Cold Rolled Grain Oriented (CRGO) silicon steel to automated foil winding, tank fabrication, shot-blasting, and multi-stage powder painting—every manufacturing step is executed in-house under strict ISO 9001 quality supervision.
Every single unit destined for South America undergoes comprehensive routine testing in accordance with IEC 60076 before dispatch: voltage ratio, vector group verification, winding resistance measurement, insulation resistance, partial discharge testing, and no-load/load loss verification.
Export units are protected with heavy-duty vacuum-sealed foil moisture barriers, nitrogen gas purging (for large power transformers), and reinforced steel-framed wooden crates engineered for maritime transport through ocean routes to the Port of Montevideo.
Clear engineering and commercial answers regarding standards, customs clearance, grid frequency, and installation support.
Yes. Our engineering design team routinely customized primary voltage taps (15kV, 30kV), secondary outputs (400V/230V), and vector groups (such as Dyn11, Dyn5, Ynd11) to comply with UTE (Usinas y Trasmisiones Eléctricas) grid interconnection requirements ET-301. We provide detailed Guaranteed Technical Particulars (GTP) and CAD drawings for municipal approval prior to production.
Aluminum foil winding provides complete mechanical stability against axial short-circuit forces, eliminates internal hot spots through continuous heat dissipation across the full sheet surface, and lowers unit weight by up to 35%. This results in significantly lower purchasing and shipping costs while maintaining an operational service life exceeding 30 years under standard loading.
We utilize automated ultrasonic cold welding and certified bimetallic copper-aluminum (Cu-Al) transition lugs. The transition interface is hermetically sealed within insulation resin or oil, preventing moisture and oxygen ingress. This eliminates galvanic action and maintains permanent low contact resistance at all external electrical connections.
For oil-immersed transformers, we apply C4-H or C5-M grade anti-corrosion marine paint systems with multi-layer epoxy primers and polyurethane topcoats. For indoor cast resin transformers, our units achieve IEC 60076-11 E2 (environmental condensation and salt fog resistance) and C2 (climatic) ratings.
Every shipment includes a full export dossier: Commercial Invoice, Packing List with NCM tariff codes (typically NCM 8504 series), Certificate of Origin, ISO 9001/14001 Quality Certificates, Factory Acceptance Test (FAT) reports, Type Test certificates, and O&M manuals in English/Spanish.
Standard distribution transformers (100kVA - 2500kVA) are produced within 3 to 4 weeks following drawing approval. Custom power transformers or compact substations require 6 to 8 weeks. Ocean freight from main Chinese ports (Ningbo/Shanghai) to Montevideo averages 35 to 45 transit days.
Request technical datasheets, single-line diagram reviews, or a competitive quotation for your upcoming project in Uruguay and South America.
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