Discover our advanced oil filled distribution transformer featuring a fully sealed corrugated tank design. This distribution transformer eliminates the conservator tank, using flexible corrugated fins that expand and contract with oil volume changes to isolate the insulating oil from the atmosphere. This prevents oil degradation and moisture ingress, significantly extending service life while reducing maintenance to near zero.
Ideal for demanding environments like metallurgy, petrochemical plants, and mining, the transformer offers superior economic performance with no-load loss reductions of 25%–35% and no-load current drops of 60%–80% compared to conventional oil-immersed units. The rolled core (wound core) made from high-quality low-loss cold-rolled silicon steel minimizes transverse and longitudinal joints, resulting in lower no-load current, reduced reactive losses, quieter operation, and enhanced environmental friendliness.
Compared to dry type distribution transformer options, this oil filled distribution transformer market favorite provides better cooling efficiency and overload capacity in outdoor or harsh conditions. Available as a three phase distribution transformer or in pad mounted distribution transformers configurations, it delivers reliable step-down performance for electrical distribution networks. Whether you need a power transformer and distribution transformer solution for industrial or utility applications, our hermetically sealed design ensures high running reliability, compact footprint, and long-term durability.
Key Features & Advantages
• Fully Sealed Corrugated Tank
Replaces traditional oil conservator and radiators; wave fins handle thermal expansion/contraction naturally, isolating oil from air to slow aging and prevent insulation moisture.
• Maintenance-Free Operation
Normal running requires no routine maintenance due to enhanced sealing and improved components.
• Energy-Efficient Rolled Core
High-quality cold-rolled silicon steel wound core eliminates traditional seams, lowering no-load losses by 25%–35% and no-load current by 60%–80%, while reducing noise for a more eco-friendly distribution transformer.
• Strong Short-Circuit Resistance
Integrated core clamping strengthens coil anti-short-circuit capability.
• Robust Surface Treatment
Oil tank undergoes degreasing, derusting, and phosphating, then coated with three-proof paint for excellent corrosion resistance in harsh environments (metallurgy, petrochemical, mining).
• Compact & Aesthetic Design
Smaller footprint than conventional units with traditional oil tubes; beautiful appearance suitable for space-constrained installations.
• High Reliability & Long Life
Bolted or welded tank-cover connection prevents oil-air contact, extending transformer lifespan and improving operational reliability over standard oil-immersed designs.
These features make it a preferred choice in the oil filled distribution transformer market, outperforming many dry type distribution transformer alternatives in cooling and heavy-load scenarios while offering the reliability expected from a quality electrical distribution transformer.
Specifications & Parameters
Our three phase distribution transformer is available in a wide range of standard ratings (customizable upon request). Typical parameters include:
| Category | Specification / Description |
| Rated Capacity | 50 kVA to 2500 kVA (common: 100, 200, 315, 500, 630, 800, 1000, 1250, 1600, 2000 kVA) |
| Rated Voltage | HV: 6 kV / 10 kV / 11 kV / 20 kV / 35 kV; LV: 0.4 kV / 0.433 kV (others available) |
| Frequency | 50 Hz / 60 Hz |
| Phase | Three-phase |
| Connection Group | Dyn11 (or per customer specification) |
| Cooling Method | ONAN (Oil Natural Air Natural) |
| Temperature Rise | Top oil ≤ 60°C, Winding ≤ 65°C (standard) |
| Impedance Voltage | 4%–6% (depending on capacity) |
| Tapping Range | ±2 × 2.5% or as specified |
| Core Type | Wound/rolled core from low-loss cold-rolled silicon steel |
| Tank Type | Hermetically sealed corrugated (wave) tank |
| Insulating Liquid | Mineral oil (or biodegradable options on request) |
| Standards Compliance | IEC 60076, IEEE C57, or equivalent national standards |
| Exact no-load and load losses are optimized per capacity for high efficiency (e.g., significantly below traditional designs). Dimensions, weight, and oil volume vary by rating—contact us for detailed datasheets tailored to your electrical distribution transformer needs. Suitable for both pole-mounted and pad mounted distribution transformers installations. |
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Packaging, Warranty & Certifications Packaging：
Robust wooden crate or container packaging with moisture-proof and shock-resistant measures for safe international transport. Accessories (bushings, nameplate, etc.) securely fastened.
Warranty：
Standard 12-18 months warranty against manufacturing defects (extendable options available). Covers core, windings, tank, and insulation system.
Quality Certifications：
ISO 9001 (Quality Management), ISO 14001 (Environmental), CE marking (where applicable), and type-test reports per IEC/IEEE standards. PCB-free oil certification and compliance with relevant energy efficiency regulations.
Technical Support：
This oil filled distribution transformer combines proven reliability with modern sealed technology, making it an excellent long-term investment for any power distribution project.
Contact us for custom solutions, quotations, or the latest insights related to power grid transformer information.
