IEC-certified dry-type and oil-immersed transformers for utility, industrial, and commercial power distribution networks. 30-2500kVA, 10-33kV, 50Hz/60Hz.
A distribution transformer is a static device that steps down high voltage electricity from transmission levels (11kV, 33kV) to utilization levels (400V, 230V) for end consumers. Unlike power transformers used in transmission substations, distribution transformers operate continuously at near-load conditions, making energy efficiency and reliability critical factors. Ziyao Power manufactures both dry-type (cast resin) and oil-immersed distribution transformers compliant with IEC 60076 standards. Our transformers serve utility companies, industrial facilities, commercial buildings, renewable energy projects, and infrastructure developments across the Middle East, Africa, and Southeast Asia. Dry-type transformers use epoxy resin encapsulation for the windings, providing fire-safe, maintenance-free operation ideal for indoor installations. Oil-immersed transformers use mineral oil or synthetic esters as insulation and cooling medium, offering higher overload capacity and outdoor durability.
Where distribution transformers are used in real-world power infrastructure projects.
Step-down transformers for residential and commercial power distribution in urban and rural networks. S11/S13 series for pole-mounted and pad-mounted installations.
Factory and manufacturing plant power supply with high reliability requirements. SCB13/SCB18 dry-type for indoor substations, S22-M for outdoor switchgear.
Shopping malls, hospitals, hotels, and office towers requiring fire-safe transformers. Dry-type SCB series installed in basement electrical rooms.
Solar farm step-up transformers (0.4kV → 10kV/33kV) and wind turbine pad-mounted transformers. Special design for harmonic currents and DC components.
Metro systems, airports, tunnels, and water treatment plants. Fire-safe dry-type transformers for underground and enclosed spaces.
Surface and underground mining power distribution with robust design for harsh environments. Flame-proof enclosures available.
Explore our range of distribution transformers for various voltage levels and applications.
Capacity: 30-2500kVA
Voltage: 10/12/33kV
Capacity: 30-2500kVA
Voltage: 10/12kV
Capacity: 30-2500kVA
Voltage: 10-33kV
Capacity: 30-2500kVA
Voltage: 10/11kV
Capacity: 30-2500kVA
Voltage: 10/11kV
Capacity: 30-2500kVA
Voltage: 10/11kV
Compare specifications across different product series.
| Feature | SCB13 | SCB18 | S11-M | S22-M |
|---|---|---|---|---|
| Type | Dry-Type | Dry-Type | Oil-Immersed | Oil-Immersed |
| Efficiency Class | Class 2 | Class 1 | Standard | Ultra-Low Loss |
| No-Load Loss | Low | Ultra-Low | Standard | 70% Lower |
| Fire Safety | Excellent | Excellent | Good | Good |
| Indoor Use | Yes | Yes | Limited | Limited |
| Maintenance | None | None | Required | Required |
Real-world installations using our distribution transformers.
Technical guides and resources about distribution transformers.
Complete technical guide to cast resin transformers, specifications, and applications.
Understanding oil-filled transformers, maintenance, and environmental considerations.
Special requirements for PV step-up transformers in solar power plants.
Dry-type transformers use epoxy resin or cast resin insulation, making them fire-safe and suitable for indoor installation. They require no maintenance and have zero fire risk. Oil-immersed transformers use mineral oil or synthetic esters for insulation and cooling, offering higher overload capacity and better outdoor durability, but require periodic oil maintenance and have fire risk.
Dry-type transformers (SCB13, SCB14, SCB18) are the preferred choice for indoor substations in commercial buildings, hospitals, metros, and data centers. Their fire-safe design eliminates the need for fire suppression systems and oil containment, reducing installation costs and space requirements.
For new installations, SCB18 or S22-M high-efficiency distribution transformers can offer strong lifetime cost performance despite higher initial price. The energy savings over 20-30 years typically exceed the price difference. For budget-constrained projects, SCB13 or S13-M provide good efficiency at competitive cost.
Yes. Transformers can be designed for 50Hz, 60Hz, or dual-frequency service when the project frequency, voltage ratio, kVA rating, ambient condition, and nameplate requirements are confirmed at RFQ stage. We review V/Hz, losses, temperature rise, cooling, and accessories before confirming the final rating.
Our transformers are IEC 60076 certified and tested according to international standards. We provide type test reports, routine test reports, and certificates of conformity. Additional certifications (SASO, SON, etc.) available for specific markets.