Product Overview
The oil-immersed distribution transformer is the backbone of medium-voltage power distribution. Windings and core are immersed in high-grade insulating oil inside a sealed corrugated tank, which provides electrical insulation, efficient cooling and protection against environmental factors. The result is a rugged, dependable transformer with excellent overload capacity and decades of trouble-free operation.
Available in a wide range of capacities from 50kVA to 2500kVA and primary voltages from 6kV to 35kV, our transformers are engineered to IEC 60076 and GB 1094 standards, with performance verified by full type tests.
Construction
| Component | Material / Design | Function |
|---|---|---|
| Core | High-grade grain-oriented silicon steel (amorphous alloy optional) | Low-loss magnetic circuit |
| Windings | High-conductivity copper or aluminum, layer or foil wound | Reliable electrical circuit |
| Tank | Fully sealed corrugated steel tank | Efficient heat dissipation, low oil temperature rise |
| Insulating Oil | Mineral oil (vegetable / silicone oil optional) | Insulation and cooling |
| Bushings | Porcelain or composite, HV and LV | Safe cable and busbar connection |
| Accessories | Oil level gauge, pressure relief valve, drain/sampling valve, nameplate, thermometers | Monitoring and maintenance |
| Tapping Switch | Off-circuit, ±2×2.5% (5 steps) | Voltage adjustment |
Key Features
- Low losses, high efficiency – Grain-oriented silicon steel core and optimized winding design minimize no-load and load losses.
- Excellent cooling – Corrugated tank with ONAN cooling provides large radiating surface, keeping oil temperature rise low and extending insulation life.
- High overload capacity – Oil-immersed construction tolerates temporary overloads better than dry-type designs.
- Reliable insulation – High-grade insulating oil provides superior dielectric strength and protects windings from moisture and contamination.
- Hermetically sealed design – Prevents oil oxidation and moisture ingress, reducing maintenance to almost zero.
- Wide rating range – 50kVA to 2500kVA (larger power transformers on request), primary 6kV–35kV, secondary 0.4kV and other voltages.
- Flexible configuration – Copper or aluminum windings, vector groups (Dyn11 / Yyn0), mineral or eco-friendly vegetable oil options.
- Full safety accessories – Oil level gauge, pressure relief valve, temperature indicator and drain valve as standard.
- Standards compliance – Designed and type-tested to IEC 60076, GB 1094, IEEE and other international standards.
Technical Specifications
| Parameter | Typical Range |
|---|---|
| Rated Capacity | 50kVA – 2500kVA (customizable) |
| Rated Primary Voltage | 6kV / 10kV / 11kV / 20kV / 33kV / 35kV |
| Rated Secondary Voltage | 0.4kV (and other voltages on request) |
| Frequency | 50 / 60 Hz |
| Cooling Method | ONAN (ONAF optional) |
| Vector Group | Dyn11 / Yyn0 (or as specified) |
| Impedance Voltage | 4% – 6% (per rating) |
| Tapping Range | ±2×2.5% (off-circuit, 5 steps) |
| Core Material | Silicon steel (amorphous alloy optional) |
| Winding Material | Copper or aluminum |
| Insulating Oil | Mineral oil (vegetable / silicone oil optional) |
| Standards | IEC 60076; GB 1094; IEEE (on request) |
Note: exact ratings, dimensions and weights vary by capacity and voltage — please provide your project parameters for a detailed technical datasheet.
Applications
- Distribution networks (urban and rural)
- Industrial plants and commercial substations
- Renewable energy stations (solar, wind)
- Utility power distribution and metering
- Mining and infrastructure projects
- Export / containerized substation projects
Why Choose Our Oil Immersed Transformer
- Proven reliability – Sealed, low-maintenance design with decades of service life in demanding environments.
- Energy-efficient – Low-loss core and winding designs reduce lifetime operating cost.
- Full customization – Capacity, voltage, vector group, oil type, accessories and painting customized to your specification.
- Complete quality assurance – Full type tests per IEC 60076 with test reports available on request.
- One-stop supply – Transformers, accessories and matching LV/MV switchgear supplied together.
Installation & Maintenance
- Transport upright and protect bushings and accessories from impact; check oil level and any leakage upon arrival.
- Install on a firm foundation with adequate clearance for cooling; connect HV/LV bushings with proper torque per the drawing.
- Before energizing, verify the tap position, vector group and earthing; perform the routine insulation checks specified in the manual.
- Maintenance is minimal: periodic visual inspection of oil level, pressure relief valve and bushings. Oil sampling every 1–3 years is recommended.
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