Large-capacity Oil-immersed Transformers
Features
- Fully sealed with a separate conservator tank to accommodate oil expansion and contraction due to temperature changes.
- Can be customised for critical environmental conditions, e.g. high altitudes (>1000 m), extreme ambient temperatures (−45 °C to +40 °C).
- The iron cores are constructed from high-quality, cold-rolled, grain-oriented (CGRO) silicon steel. The limbs are coated with polyurethane varnish and cured for enhanced insulation and durability.
- The windings are made from oxygen-free copper (OFC), with an optimized winding pattern that enhances short-circuit resistance.
- The design incorporates effective support at the winding ends, further enhancing the winding’s short-circuit resistance.
Amorphous core variation
- Core made of amorphous alloy, resulting in 75% to 80% lower no-load losses than those of traditional silicon steel cores.
- Less heat dissipation and temperature rise.
- Suitable for industrial and mining sites operating on a multi-shift schedule with a load factor between 50% and 80%.
- The low-voltage winding adopts a foil-winding structure, offering strong short-circuit resistance.
- Adopts a Dyn11 connection group, reducing harmonic impact on the power grid and improving power quality.
- Strong overload capacity, excellent corrosion resistance, high safety and reliability with low maintenance costs.
Specification
- Voltage rating: up to 33 kV
- Rated power capacity: from 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