Beijing Dongyao International Trading supplies cast-resin dry-type transformers for industrial parks, data centers, and critical infrastructure across emerging markets. Factory-direct from Guizhou, China.
Each product is sourced from ISO 9001-certified Chinese manufacturers with full IEC compliance and material traceability.
Epoxy resin cast-coil dry-type distribution transformer. Vacuum-cast under partial discharge control <5 pC. F1 fire rating per IEC 60076-11.
XLPE-insulated, PVC-sheathed LV cable for distribution networks. IEC 60502-1 compliant. Copper or aluminum conductor.
Distribution cabinets and MCC panels for factory power distribution. IEC 61439 compliant. Custom configurations.
Every SCB series dry-type transformer consists of these core subsystems. Hover over the diagram above for reference, or read the detailed breakdown below.
Vacuum-cast under precisely controlled conditions. Copper wire windings are embedded in epoxy resin with silica filler, then cured in an oven cycle. The result is a void-free insulation system with high mechanical strength and thermal conductivity. The cast resin surface is self-extinguishing (F1) and hydrophobic — it will not support combustion or absorb moisture in tropical environments.
Cold-rolled grain-oriented silicon steel laminations (0.23–0.30 mm thick) assembled with step-lap mitered joints. This construction minimizes no-load losses and magnetostrictive noise. The core is clamped with channel-section steel frames and bolted to the base.
Natural air cooling (AN) via vertical air ducts between the coils and core limbs. Air enters at the bottom, rises through the ducts, and exits at the top, carrying heat away from the windings. Optional forced air cooling (AF) with axial fans increases rated capacity by approximately 40%.
HV side: porcelain bushings with copper connection straps. LV side: foil-type copper terminals. An off-circuit tap changer (±5%) is fitted on the HV side. PT100 resistance temperature detectors are embedded in each phase coil for connection to a digital temperature controller.
IP00 (open operation), IP20 (touch-safe screen), IP23 (drip-proof), IP40 (indoor enclosed), or IP54 (outdoor with weather protection). Enclosures are fabricated from sheet steel with a two-coat polyester powder finish.
Cast-resin dry-type transformers offer measurable advantages in safety, maintenance, and lifecycle cost — particularly for indoor and populated installations.
No oil — no fire propagation, no explosion hazard, no toxic fumes. Epoxy resin is self-extinguishing (F1). Suitable for indoor installation in hospitals, airports, shopping centres.
IEC 60076-11No oil filtering, no dielectric tests, no leak inspection. Annual visual inspection of dust accumulation on cooling ducts. Lower total cost of ownership over 25+ years.
Epoxy cast coils are hydrophobic — they will not absorb moisture even at 95% RH. No condensation tracking. Proven 30-year service life in Southeast Asian climates.
Install directly inside buildings, next to load centres. No separate transformer room, no fire walls, no oil containment pits required. Reduces civil construction costs.
140% continuous with forced air cooling (AF fans). 170% short-term emergency overload. Thermal class F (155°C) or H (180°C) insulation allows significant headroom.
Zero oil — no soil or water contamination risk. Epoxy resin is inert at end of life. Core steel and copper windings are 100% recyclable. RoHS and WEEE compliant.
SCB dry-type transformers are the standard choice for indoor power distribution in commercial, industrial, and critical infrastructure installations worldwide.
Each industrial park in Vietnam's Bac Ninh, Binh Duong, and Dong Nai provinces requires 5–50 distribution transformers for factory zones. 22/0.4 kV, 500–2,500 kVA, Dyn11. ASEAN-China FTA: zero tariff on HS 8504.33.
Tier III/IV data centres demand transformers with F1 fire rating, zero oil, and high overload capacity. Our SCB13 series meets the UPS and PDU power distribution requirements of hyperscale facilities.
Step-up transformers for solar farms, wind parks, and mine-site power distribution. Designed for harsh outdoor conditions: sand, dust, high UV, and temperature extremes of +50°C.
Hospitals, airports, hotels, shopping malls, and office towers. Dry-type transformers operate silently (<55 dB) and can be installed in basements, rooftops, or plant rooms without fire risk.
All ratings comply with IEC 60076-11 and GB/T 1094.11. Custom voltages and impedances available on request.
| Standard Power Ratings (kVA) | 100 / 200 / 315 / 500 / 630 / 800 / 1000 / 1250 / 1600 / 2000 / 2500 |
| High Voltage (kV) | 6 / 6.3 / 10 / 10.5 / 11 / 20 / 22 / 33 / 35 |
| Low Voltage (kV) | 0.4 / 0.433 / 0.69 |
| Frequency | 50 / 60 Hz |
| Vector Group | Dyn11 (standard), Yyn0, Yd11, Dd0 |
| Impedance Voltage | 4% (≤630 kVA) / 6% (800–2500 kVA) ±10% |
| No-Load Loss (SCB13) | 30% below IEC 60076-11 limits |
| Sound Power Level | 49–58 dB(A) depending on rating |
| Insulation Thermal Class | F (155°C) / H (180°C) |
| Temperature Rise Limit | 100 K (F) / 125 K (H) |
| Partial Discharge | <5 pC at 1.2 Un (IEC 60076) |
| Ambient Temperature | -25°C to +50°C |
| Altitude | ≤1,000 m (derating above, consult factory) |
| Cooling Method | AN (natural) / AF (forced air, +40% capacity) |
| Degree of Protection | IP00 / IP20 / IP23 / IP40 / IP54 |
| Fire Behaviour | F1 — self-extinguishing, no flaming droplets |
Every transformer is type-tested and routine-tested in accordance with applicable international standards. Test reports are provided with each shipment.
We combine Guizhou's manufacturing capability with dedicated export logistics and supply chain finance.
China's VAT rebate on power equipment exports passes directly to your purchase. We handle all customs documentation and declare the rebate in your favour.
Our manufacturing partners have shipped to 30+ countries. Proven export logistics and compliance for ASEAN, Africa, and the Middle East.
Backed by a dedicated facility through China Poly Group. Flexible payment terms — L/C, T/T, and structured trade finance for qualified buyers.
Type test reports, routine test certificates, material certifications, and CE declaration of conformity provided with every shipment.
Focused on markets with strong IEC standards adoption, direct China trade agreements, and growing infrastructure investment.
Vietnam, Philippines, Indonesia, Thailand
ASEAN FTA · Zero tariff
South Africa, Nigeria, Kenya
High demand · Limited local production
UAE, Saudi Arabia
Premium · Component/OEM route
Mexico, Chile
UL certification · Long term potential
Send us your project requirements. We will respond with pricing, lead time, and technical documentation within 24 hours.