Discover high-efficiency oil immersed distribution transformers featuring fully sealed corrugated tank design and advanced wound core technology.
As trusted distribution transformer suppliers, we offer low-loss power transformers for sale with up to 80% reduced no-load current. Ideal for power plants, industrial sites, and harsh environments.
Explore our range of electric power transformers and power plant transformers today.
Key Features & Advantages
Our fully sealed oil immersed distribution transformers deliver superior performance, energy savings, and long-term reliability compared to traditional designs. Key advantages include:
• Fully Sealed Corrugated Tank Design
Eliminates the conservator (oil conservator), using flexible corrugated fins (wave wings) made from premium cold-rolled steel sheets as both cooling and expansion elements. The tank expands and contracts with oil volume changes, completely isolating the transformer oil from the atmosphere. This prevents oil deterioration, insulation moisture ingress, and extends service life while enabling maintenance-free operation under normal conditions.
• Advanced Wound Core Technology
Utilizes high-quality low-loss cold-rolled silicon steel sheets in a continuous wound structure without traditional punching or seams. This eliminates transverse and longitudinal joints, significantly reducing no-load current by 60%–80% and no-load losses by 25%–35%, resulting in lower reactive power losses, reduced noise levels, and a more environmentally friendly operation.
• Enhanced Short-Circuit Withstand
Integrated core and clamping structure primarily clamps the windings, greatly improving the coil’s ability to resist short-circuit currents.
• Robust Surface Treatment
Corrugated tank undergoes degreasing, derusting, and phosphating before application of three-proof paint, making it highly suitable for harsh environments such as metallurgy, petrochemical, and mining operations.
• Compact Footprint
Wave-plate radiators provide efficient cooling in a smaller, aesthetically pleasing enclosure that occupies less space than conventional radiator or conservator designs.
• High Reliability & Longevity
Improved sealing components and manufacturing processes ensure exceptional operational reliability and extended transformer life.
These features make our units among the most advanced electric power transformers available from leading manufacturers of power transformers in the growing power transformer market.
Specifications & Parameters
Our oil immersed distribution transformers are available in a wide range of ratings to meet diverse application needs (custom configurations available):
| Category | Specification / Description |
| Type | Hermetically sealed oil-immersed distribution transformer with wound core |
| Phases | Three-phase |
| Frequency | 50 Hz / 60 Hz |
| Rated Capacity | 30 kVA to 2500 kVA(common models: 100 kVA, 200 kVA, 315 kVA, 500 kVA, 800 kVA, 1000 kVA, 1250 kVA, 1600 kVA) |
| Rated Voltage | High voltage side: 6 kV / 10 kV / 11 kV / 20 kV / 35 kV; Low voltage side: 0.4 kV / 0.415 kV / 0.433 kV |
| Frequency | 50 Hz / 60 Hz |
| Vector Group | Dyn11 (or as required) |
| Cooling Method | ONAN (Oil Natural Air Natural) |
| Tap Changer | Off-circuit tap changer, typically ±2 × 2.5% or ±5% |
| Insulation Class / Temperature Rise | Oil: 60°C / Winding: 65°C (standard limits) |
| Impedance Voltage | 4%–6% (depending on capacity) |
| Core Material | High-permeability cold-rolled silicon steel, wound core structure |
| Winding Material | High-conductivity copper or aluminum |
| Insulating Liquid | Mineral oil (IEC 60296 compliant) |
| Typical performance highlights (example for 500 kVA 11/0.4 kV class): significantly reduced no-load losses and current compared to conventional designs, low noise, and high efficiency. Exact values are provided in detailed technical datasheets for each rating. | |
Packaging, Warranty & Certifications Packaging：
Robust export seaworthy packaging with wooden crates or steel frames, moisture-proof and shock-resistant protection for safe global transportation. Oil is typically filled at the factory for sealed units or shipped separately as required.
Warranty：
Standard 12–18 months warranty (extendable), covering manufacturing defects and performance guarantees on losses. Comprehensive after-sales support available.
Quality Certifications：
IEC 60076 compliant, with routine and type test reports. Additional certifications (ISO 9001, ISO 14001, etc.) and third-party testing available upon request. Suitable for international projects and utility approvals.
Technical Support：
As one of the reliable distribution transformer suppliers and manufacturers of power transformers, we provide competitive pricing on power transformer for sale options, including specialized power plant transformers and cooper power transformers equivalents.
Contact us for quotes, custom specifications, or to discuss your requirements in the power transformer market.
