Versatile oil‑immersed distribution transformers suit residential, commercial and light‑industrial grid deployments. Anti‑corrosion enclosure and premium silicon‑steel core cut energy waste. IEC‑GB and RoHS accredited, adaptable capacities, taps and mounting. Strict factory validation, minimal upkeep, global engineering support for your power infrastructure projects.
Key Features & Advantages
Our oil-immersed distribution transformer stands out with advanced engineering that ensures superior performance, energy savings, and durability. Built to serve as a robust power distribution transformer, it delivers consistent power to end users while minimizing operational costs.
• Advanced Core Technology
Uses high-permeability silicon steel with a full oblique seven-step lap joint structure. This uniform magnetic flux distribution significantly reduces no-load excitation current and no-load losses for maximum efficiency.
• Premium Windings
High and low voltage coils are wound with high-quality oxygen-free copper wire in a multi-layer cylindrical structure, ensuring excellent electrical conductivity and mechanical strength.
• Fully Sealed Tank Design
The corrugated radiator and hermetically sealed oil tank create an attractive, compact footprint with superior heat dissipation. No conservator needed, eliminating moisture ingress and extending insulation life.
• Optimized Cooling System
Axial oil ducts inside the windings direct oil flow toward high-temperature zones, achieving excellent heat dissipation, lower temperature rise, and higher overload capacity.
• Robust Mechanical Structure
Axial clamping, special lifting plates, and advanced fastening systems allow the transformer to withstand transportation shocks. The no-core-lifting design saves time and cost during installation and maintenance.
• Eco-Friendly & Low Noise
Operates with minimal noise, low temperature rise, and zero environmental pollution. High efficiency and maintenance-free operation make it ideal for modern power networks.
These features make our electrical power distribution transformers a trusted choice for utilities and industries seeking reliable, energy-efficient solutions comparable to premium cooper power transformers.
Specifications & Parameters
Our oil immersed distribution transformer (also known as power and distribution transformer) 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 (common models: 100, 200, 315, 500, 630, 800, 1000, 1250, 1600, 2000 kVA) |
| High Voltage (HV) | 6 kV, 10 kV, 11 kV, 20 kV, 22 kV, 33 kV (±2 × 2.5% or ±5% taps) |
| Low Voltage (LV) | 0.4 kV / 0.415 kV / 0.433 kV (Customizable) |
| Frequency | 50 Hz / 60 Hz |
| Vector Group | Dyn11 (or Yyn0 upon request) |
| Cooling Method | ONAN (Oil Natural Air Natural) |
| Insulation Class | A (105°C) |
| Temperature Rise | Top oil ≤ 60°C, Winding ≤ 65°C |
| Impedance Voltage | 4% – 6% (depending on capacity) |
| No-Load Loss & Load Loss | Optimized per IEC 60076 standards for high efficiency |
| Short-Circuit Withstand | Designed to withstand mechanical and thermal stresses per international standards |
| No-Load Loss & Load Loss | Optimized per IEC 60076 standards for high efficiency |
| Protection Degree | IP00 (indoor) or suitable for outdoor installation with sealed design |
| Note: These power supplies transformers parameters can be customized for special voltage ratios or environmental conditions. While primarily AC distribution transformer units, we also support related DC applications through compatible dc power transformer designs where required. | |
Packaging, Warranty & Certifications Packaging：
Each oil immersed distribution transformer is securely packed in a sturdy wooden crate or container with moisture-proof and shock-absorbing materials to ensure safe transportation over long distances.
Warranty：
Standard 18-month warranty from the date of delivery or 12 months from commissioning (whichever comes first). Extended warranty options up to 5 years available with service contracts.
Quality Certifications：
Compliant with IEC 60076, IEEE C57.12.00, and equivalent international standards
- ISO 9001 Quality Management System
- CE Marking (where applicable)
- Type-test reports and routine test certificates provided with every unit
- Environmental and safety compliance for oil-immersed designs.
Technical Support：
Our commitment to quality ensures every power and distribution transformer delivers long-term reliability, making it an excellent alternative or complement to established brands like cooper power transformers.
Ready to power your project with efficient electrical power distribution transformers?
Contact our team for detailed quotes, technical drawings, or custom solutions tailored to your voltage and capacity requirements.
The core is high-permeability silicon steel with a full oblique seven-step lap joint - a detail that spreads flux evenly through the joint and trims the excitation current and no-load loss a weaker joint would draw. High- and low-voltage coils use oxygen-free copper wire in a multi-layer cylindrical arrangement, giving good conductivity plus the mechanical strength to ride out short-circuit forces. The tank is hermetically sealed with a corrugated wall doing the radiator's job, so the oil never meets outside air and moisture has no route in. Inside the windings, axial oil ducts steer hot oil away from the hottest zones, which is why a three phase distribution transformer built this way holds a lower temperature rise and takes short overloads without stress.
| Common ratings | 100, 200, 315, 500, 630, 800, 1000, 1250, 1600, 2000 kVA |
| High voltage | 6 kV, 10 kV, 11 kV, 20 kV, 22 kV, 33 kV |
| Tap range | ±2 × 2.5% or ±5% |
| Low voltage | 0.4 kV / 0.415 kV / 0.433 kV |
| Losses | No-load and load loss optimised to IEC 60076 |
Buying a transformer for a project needs more than a catalogue number. Our engineering team works with you from the first enquiry: reviewing your load, duty cycle and grid conditions, then matching the right rectifier or oil-immersed distribution transformer to the application. We support customised and OEM builds, and where certification applies our units are supplied to IEC 60076 and CE/ISO standards. After delivery we stay involved with installation and commissioning guidance and troubleshooting support, backed by warranty and global service.
Start from the load you expect to carry plus the headroom you want for future expansion, rather than the sum of every nameplate on site. A commercial building or a light-industrial line usually sits towards the lower end of the range, while a plant feeder or a utility bay that has to grow moves higher. Motor-heavy sites are sized as an industrial power transformer, with starting currents and duty cycle taken into account.
This oil immersed distribution transformer is built for maintenance-free operation: the tank is hermetically sealed, so there is no conservator to top up and no routine oil handling. Day-to-day care is a short visual round - check the tank and seals for weeping, read the oil temperature gauge against the load, and keep the corrugated wall clear of dust or nesting material. Oil sampling and insulation testing are normally scheduled to your own maintenance plan.
Taps correct the output when the site voltage sits above or below nominal, which happens on networks that run high at light load. Fine steps either side of nominal are standard, and a wider step range can be specified where the supply is known to swing. Taps are changed off load, normally once at commissioning after the measured voltage is known, and revisited only if the supply characteristic changes.
Dyn11 is the standard vector group for this range and the usual pick for mixed commercial, industrial and residential loads - it copes well with unbalanced single-phase loading and gives triplen harmonics a low-impedance path. Yyn0 is available on request where an existing network or a parallel-running unit calls for it. If you are paralleling with an installed transformer, match its vector group and phase displacement exactly, and send us the nameplate details so we can confirm the build.
Usually yes, and it is a common job. The sealed design is compact and needs no conservator, so it often fits the existing footprint or pad. Two things decide it: the mounting and cable-entry arrangement, and whether your protection is already set for the vector group you are replacing. As the distribution transformer manufacturer we build to your dimensions and connection details where they have to match.
Confirm the high and low voltages, the rating, the vector group and the tap range, and say whether the unit will sit indoors or outdoors, since the outdoor arrangement uses the sealed design. It also helps to flag early if the transformer has to match an existing footprint or cable-entry layout, and which documents your project file needs. Working with the power transformer supplier directly means the design is reviewed by the people who build it.
