Overview
Large-capacity Oil-immersed Transformers are engineered to deliver high-performance power distribution for heavy-duty industrial, commercial, and utility environments. Their robust construction, efficient cooling systems, and ability to withstand extreme operating conditions make them the ideal choice for large-scale, continuous-duty applications.
Applications
Perfect for mining operations, large industrial facilities, utility substations, data centers, and high-load commercial environments. These transformers are built to support multi-shift operations, fluctuating load patterns, and installations in harsh or high-altitude locations.
Design Highlights
Featuring high-grade silicon steel cores, oxygen-free copper windings, and a separate conservator tank system, these transformers offer exceptional insulation stability and cooling efficiency. The rugged mechanical structure enhances short-circuit strength and overall durability.
Operational Advantages
Customizable for tough environments, they maintain optimal performance in extreme temperatures and at elevations above 1000 meters. Their strong overload capacity, corrosion resistance, and low maintenance requirements ensure reliable operation in demanding industrial scenarios.
Environmental & Safety Considerations
The sealed system with a separate conservator ensures controlled oil expansion while minimizing contamination risks. Harmonic-reducing winding configurations and high-quality insulation materials enhance safety, efficiency, and grid stability.
Maintenance & Lifespan
Engineered for uninterrupted, long-term performance, these transformers offer reduced maintenance needs due to durable materials, optimized cooling, and stable insulation systems. Their design supports long service life even in heavy-duty or high-load operating environments.
Features
- Fully sealed with a separate conservator tank to manage oil expansion and contraction caused by temperature variations, ensuring stable insulation and long-term reliability.
- Customizable for critical environmental conditions, including high altitudes (>1000 m) and extreme ambient temperatures (−45 °C to +40 °C), making it suitable for demanding industrial sites.
- Iron cores constructed from high-quality cold-rolled, grain-oriented (CGRO) silicon steel. Core limbs coated with polyurethane varnish and cured for enhanced insulation, durability, and mechanical strength.
- Windings made from oxygen-free copper (OFC) with an optimized winding pattern, providing excellent short-circuit resistance and superior voltage regulation under varying loads.
- Effective mechanical support at the winding ends improves structural integrity, minimizing deformation under short-circuit or overload conditions.
- Strong overload capacity, high corrosion resistance, and robust design ensure safe and reliable operation with minimal maintenance.
- Designed for industrial and mining applications, including multi-shift operations, providing continuous and stable power supply even under heavy load conditions.
Amorphous Core Variation
- Core made from amorphous alloy reduces no-load losses by 75%–80% compared to conventional silicon steel cores, boosting overall energy efficiency.
- Lower heat dissipation and reduced temperature rise allow prolonged operation under heavy loads without affecting reliability.
- Suitable for industrial and mining sites operating multi-shift schedules with load factors between 50%–80%.
- Low-voltage windings use a foil-winding structure, offering strong short-circuit resistance and improved thermal stability.
- Dyn11 connection group reduces harmonic impact on the power grid, enhancing power quality and ensuring stable voltage for sensitive equipment.
- High safety, reliability, and long-term durability with low maintenance costs make it ideal for large-scale power distribution applications.
Specifications
- Voltage rating: Up to 33 kV
- Rated power capacity: 50 kVA to 31.5 MVA
- Rated frequency: 50 Hz
- Vector connections: Yyn0, Dyn11, Yd11, Ynd11
- No-load taps: ±2.5%, ±5%
- On-load tap changers: ±2×2.5% or ±3×2.5%
- Standards: AS 60076
Enclosures for Large-capacity Oil-immersed Transformers
The robust enclosure offers superior protection against harsh environmental and operational conditions. The conservator system ensures safe oil expansion management, maintaining insulation strength and internal stability. Designed for long-term durability, the enclosure minimizes maintenance, shields internal components from moisture and contaminants, and supports reliable operation across demanding industrial environments.
