5 MVA 33kV High-Altitude Mining Transformer Substation in Andes Copper Mine, Peru
Custom high-altitude engineered 5 MVA 33kV power transformer with high creepage distance bushings (>31mm/kV), derated cooling, and IP54 outdoor protection for continuous Andes copper mining operations.
1. Project Context & Operational Challenge
High-altitude Andean mining operations (>3,500m ASL) experience severe atmospheric pressure drop and thin air dielectric insulation loss, high UV radiation, and wide ambient temperature fluctuations (ΔT = 45°C). Standard distribution transformers suffer severe thermal overheating and premature dielectric insulation breakdown when operated at altitude without specialized derating engineering.
2. Customized Engineering Solution
XinHuan sales engineers designed a custom high-altitude 5000 kVA 33kV/0.48kV oil-immersed power transformer with expanded radiator cooling surface (+25% heat dissipation reserve), grain-oriented silicon steel core mitered step-lap miter joints to minimize no-load losses, high creepage distance porcelain bushings (>31mm/kV), and C5-M heavy industrial anti-corrosion marine paint.
3. Installed Equipment Parameters & Ratings
| Parameter Specification | Design Rating & Certified Value |
|---|---|
| Rated Capacity | 5000 kVA (5 MVA) |
| Primary Voltage | 33 kV (33,000V) |
| Secondary Voltage | 0.48 kV (480V 3-Phase) |
| Installation Elevation | 3,850 Meters Above Sea Level (ASL) |
| Cooling Method | ONAN (Oil Natural Air Natural) |
| Vector Group | Dyn11 |
| Short-Circuit Impedance | 7.0% |
| Standard Compliance | IEC 60076-1 / ANSI C57.12 |
| Factory Warranty | 36 Months Manufacturer Warranty |
4. Project Outcomes & Field Performance
The 5 MVA unit was shipped direct to Port of Matarani & Callao, Peru. Commissioned in 2024, the transformer has operated continuously for over 18 months through peak copper crushing cycles with zero thermal trips and perfectly stable oil temperatures.
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