Discover high-quality oil immersed distribution transformers designed for reliable voltage transformation in power distribution systems.
Learn what power transformers do, explore types of power transformers, and find trusted distribution transformer suppliers offering low-loss, low-noise 3 phase distribution transformers with superior cooling and maintenance-free operation. Ideal for high voltage power transformers applications.
Key Features & Advantages
Our oil immersed distribution transformers are engineered as static electrical devices that transform AC voltage and current based on electromagnetic induction principles, efficiently transmitting electrical energy while directly supplying power to end users. These robust units deliver reliable performance in various power distribution networks.
• Advanced Core Design
Utilizes novel high-permeability silicon steel core with full oblique seven-step lap joints for uniform magnetic flux distribution, significantly reducing no-load excitation current and core losses.
• Premium Windings
High and low voltage windings made from high-quality oxygen-free copper wire with multi-layer cylindrical structure for excellent electrical performance and durability.
• Hermetically Sealed Tank
Fully sealed corrugated radiator tank design ensures an aesthetic appearance, compact footprint, and effective protection against environmental factors while allowing thermal expansion.
• Optimized Cooling System
Axial oil ducts inside the coils direct oil flow toward high-temperature areas for superior heat dissipation, lower temperature rise, and higher overload capacity.
• Robust Construction
Axial clamping, special lifting plates, advanced fasteners, and proven processes enable the transformer to withstand transportation vibrations. The no-core-lifting design saves inspection time and costs.
• Eco-Friendly & Low Maintenance
Oil-immersed technology provides excellent insulation and cooling without pollution, low noise, high efficiency, and virtually maintenance-free operation over a long service life.
These features make our transformers ideal for urban and rural power grids, industrial facilities, commercial buildings, and renewable energy integration, answering common questions like“what do power transformers do” and “what is inside a power transformer” — a high-grade magnetic core, copper windings, and insulating/cooling oil all housed in a durable sealed tank.
Specifications & Parameters
Our 3 phase distribution transformer series is available in a wide range of ratings to meet diverse application needs. Typical technical parameters (custom configurations available upon request):
| Category | Specification / Description |
| Rated Capacity | 50 kVA to 2500 kVA (or higher on demand) |
| High Voltage (HV) | 6 kV, 6.3 kV, 10 kV, 10.5 kV, 11 kV, 20 kV, 33 kV (±2×2.5% or ±5% tapping range) |
| Low Voltage (LV) | 0.4 kV, 0.415 kV, 0.433 kV, 0.69 kV (Customizable) |
| Frequency | 50 Hz / 60 Hz |
| Vector Group | Dyn11, Yyn0, Yzn11 (common for distribution applications) |
| Cooling Method | ONAN (Oil Natural Air Natural) |
| Impedance Voltage | 4% ~ 6% |
| No-load Loss | Optimized low values per capacity (e.g., significantly reduced compared to conventional designs) |
| Load Loss | Low copper losses at 75°C |
| Temperature Rise | Top oil ≤ 60°C, winding ≤ 65°C (standard limits) |
| Insulating Oil | High-quality mineral oil (or eco-friendly options) |
| Altitude | ≤ 1000 m (custom designs for higher altitudes available) |
| Short-Circuit Withstand | Designed to meet IEC/IEEE standards |
| These parameters ensure high efficiency, low losses, and reliable operation even under fluctuating loads, making them suitable for demanding high voltage power transformers roles in the power grid. | |
Packaging, Warranty & Certifications Packaging：
Transformers are securely packed in robust wooden crates or seaworthy containers with protective measures against moisture, shock, and vibration during transportation. All units undergo rigorous factory testing before shipment.
Warranty：
Standard 12–18 months from commissioning (or up to 36 months from shipment), covering manufacturing defects. Extended warranty options and service packages are available for peace of mind.
Quality Certifications：
Compliance with IEC 60076 series
- IEEE/ANSI C57 standards where applicable
- ISO 9001 quality management system
- Additional certifications such as UL, CE, or others available upon specific market requirements.
Technical Support：
As a professional distribution transformer suppliers, we focus on delivering safe, efficient, and compliant products that support stable power grid operations.
Contact us for custom solutions, quotations, or the latest insights related to power grid transformer news today. Our oil immersed transformers combine advanced technology with proven reliability for long-term value in any distribution network.
