220 kV 120 MVA Transformer Radiator Replacement
Project Location: Russia (Outdoor Fixed Substation)
Project Objective: Cooling System Retrofit & Transformer Power Capacity Optimization
Key Equipment: Customized Hot-dip Galvanized Flat Tube Transformer Radiators
Project Background and Challenges
During a major EPC power project in Russia, a 220kV 120MVA oil-immersed power transformer that had been in service for over 15 years faced critical performance bottlenecks. Due to the increasing industrial load downstream, the original cooling fins suffered from scaling and insufficient surface area. This led to frequent high-temperature alarms during peak summer months, severely limiting the transformer’s ability to operate at its full 120MVA capacity, let alone meet short-term 10-20% overload requirements.
Core Challenges:
- Extreme Environment: Must withstand the drastic temperature fluctuations of the Russian climate (extreme cold to high heat).
- Space Constraints: Significant cooling improvement required without altering the transformer’s main body or existing flange interfaces.
- Overload Requirements: Optimizing thermal stability to allow for safe power capacity increases without excessive fan power consumption.
The Solution: Customized High-Surface-Area Design
We provided a complete, tailor-made Flat Tube Radiator replacement solution. By optimizing the ratio of section width to tube count for the specific operational characteristics of a 220kV transformer, we ensured maximum oil circulation efficiency.
Technical Highlights:
- Hot-dip Galvanization (ISO 1461): To handle outdoor Russian environments, all units were treated with HDG (average zinc thickness >85μm), ensuring 30+ years of corrosion resistance.
- Fluid Simulation Design: Recalculated section spacing to increase the total cooling surface area by 25% within the same footprint.
- Offset (Gooseneck) Interfaces: Perfectly matched the flange positions of the legacy transformer for a “plug-and-play” installation with zero site modifications.
Transformer Radiator Technical Specifications (Real Parameters)
| Item | Specification / Value |
|---|
| Product Type | Offset Flat Tube Radiator |
| Center Distance (CD) | 3000 mm |
| Section Width | 520 mm |
| Sections per Unit | 26 Sections |
| Cooling Area per Unit | 42.8 m2m2 |
| Tube Thickness | 1.2 mm (Cold-rolled Low Carbon Steel) |
| Surface Treatment | Hot-dip Galvanizing (ISO 1461 Standard) |
| Design Pressure | 2.0 bar |
| Test Pressure | 3.0 bar (Maintained for 24 hours without leakage) |
| Oil Flow Channel | 11 mm High-Flow Internal Oil Duct |
Results and Benefits
Following a 2-week scheduled outage for installation and oil filling, the transformer successfully resumed operations.
- Significant Temperature Reduction: Top oil temperature dropped by an average of 8-10°C under the same load conditions compared to the old system.
- Overload Capacity Boost: Tests confirmed that the transformer can now safely support a sustained 110% load (132MVA), with thermal rise remaining well within safety limits.
- Minimized Downtime: The customized “Analogue” design improved onsite flange alignment efficiency by 50%, significantly shortening the EPC project timeline.
Why Choose Our Transformer Cooling Solutions?
With over 18 years of manufacturing experience, we understand the specific pain points of B2B buyers in extreme environments:
- High Durability: Every radiator undergoes rigorous pressure and NDT (Non-Destructive Testing) before shipment.
- Customization for Retrofits: We provide 1:1 replacement (Analogue) designs based on your original transformer drawings—perfect for aging substation upgrades.
- Global EPC Track Record: Supporting 500+ projects in 27 countries, we are experts in the technical logic behind high-intent B2B search scenarios.
