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Dry-Type Transformers
10 Series · 1464 Models
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Dry-Type Transformers Overview
Dry-type transformers are essential components in modern electrical distribution systems, offering fire-safe, maintenance-free operation without insulating oil. QDTB dry-type transformers are designed for indoor applications in commercial buildings, hospitals, data centers, and industrial facilities. Our cast resin and open-wound designs cover 30 kVA to 3,300 kVA, up to 35 kV, meeting IEC 60076-11 standards.
Available Series
SCB14 Series
The SCB14 series delivers superior energy efficiency with Level 4 rating, offering significant energy savings and environmental benefits. Rated 10–5000 kVA, 0.48–35 kV primary and 0.208–0.48 kV secondary, Class F insulation with 65 K temperature rise, IP00–IP31 enclosure (IP42–IP66 available on request). Suitable for indoor substations, data centers, commercial buildings, industrial plants, and solar/wind farms.
SCB13 Series
The SCB13 series is an energy-efficient variant of cast resin dry-type transformers, meeting Level 3 energy efficiency standards with reduced no-load losses. Rated 10–5000 kVA, 0.48–35 kV primary and 0.208–0.48 kV secondary, Class F insulation with 65 K temperature rise, IP00–IP31 enclosure (IP42–IP66 available on request). Suitable for indoor substations, data centers, commercial buildings, industrial plants, and solar/wind farms.
SCB15 Series
The SCB15 series represents the highest energy efficiency class, achieving Level 5 rating with exceptional performance and minimal energy waste. Rated 10–5000 kVA, 0.48–35 kV primary and 0.208–0.48 kV secondary, Class F/H insulation with 65 K temperature rise, IP00–IP31 enclosure (IP42–IP66 available on request). Suitable for indoor substations, data centers, commercial buildings, industrial plants, and solar/wind farms.
SCBH15 Series
The SCBH15 series combines cast resin technology with amorphous alloy core material, achieving ultra-low no-load losses approximately 20% of traditional silicon steel transformers. Rated 10–5000 kVA, 0.48–35 kV primary and 0.208–0.48 kV secondary, Class F/H insulation with 65 K temperature rise, IP00–IP31 enclosure (IP42–IP66 available on request). Suitable for indoor substations, data centers, commercial buildings, industrial plants, and solar/wind farms.
SCR Series
The SCR series features special structural designs for specific application requirements, offering customized solutions for challenging environments. Rated 10–5000 kVA, 0.48–35 kV primary and 0.208–0.48 kV secondary, Class F insulation with 65 K temperature rise, IP00–IP31 enclosure (IP42–IP66 available on request). Suitable for indoor substations, data centers, commercial buildings, industrial plants, and solar/wind farms.
SG13 Series
The SG13 series features open-type construction with Level 3 energy efficiency, providing excellent ventilation and cooling for demanding applications. Rated 10–5000 kVA, 0.48–35 kV primary and 0.208–0.48 kV secondary, Class F insulation with 65 K temperature rise, IP00–IP31 enclosure (IP42–IP66 available on request). Suitable for indoor substations, data centers, commercial buildings, industrial plants, and solar/wind farms.
SCL13 Series
The SCL13 series features aluminum winding construction while maintaining Level 3 energy efficiency, offering cost-effective solutions for various applications. Rated 10–5000 kVA, 0.48–35 kV primary and 0.208–0.48 kV secondary, Class F insulation with 65 K temperature rise, IP00–IP31 enclosure (IP42–IP66 available on request). Suitable for indoor substations, data centers, commercial buildings, industrial plants, and solar/wind farms.
SCB Series
The SCB series represents three-phase cast resin dry-type transformers, featuring advanced insulation technology for reliable performance in indoor applications. Rated 10–5000 kVA, 0.48–34.5 kV primary and 0.208–0.48 kV secondary, Class F/H insulation with 65 K temperature rise, IP00–IP31 enclosure (IP42–IP66 available on request). Suitable for indoor substations, data centers, commercial buildings, industrial plants, and solar/wind farms.
VPI Dry-Type Transformers Series
VPI (Vacuum Pressure Impregnated) dry-type transformers use open-wound, Nomex-insulated coils impregnated under vacuum and pressure, combining fire safety and moisture resistance with a lighter, repairable construction. Rated 10–5000 kVA, 0.48–35 kV primary and 0.208–0.48 kV secondary, Class F/H insulation with 65 K temperature rise, IP00–IP31 enclosure (IP42–IP66 available on request). Suitable for oil & gas wellheads, chemical plants, coastal installations, and industrial facilities.
Specialty Dry-Type Transformers Series
Specialty dry-type transformers cover harmonic-rated K-factor units, marine three-proof designs, drive-isolation transformers for variable-frequency drives, and 12/24-pulse phase-shift rectifier duty, with US-standard options. Rated 10–5000 kVA, 0.48–35 kV primary and 0.208–0.48 kV secondary, Class F/H insulation with 65 K temperature rise, IP00–IP31 enclosure. Suitable for data centers, marine and offshore installations, VFD drives, and industrial rectifier systems.
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The values below are computed from what you selected above. Anything that cannot be computed yet is shown as an em dash — never as zero.
Iₙ = S / (√3·U) · I_sc = 100·Iₙ / uₖ · S_sc = √3·U·I_sc · I_p = k·Iₖ
Still required to complete the calculation: rated capacity S, impedance voltage uₖ, short-time or peak withstand current.
Per-model values (P0 / Pk / uₖ declared by the factory, losses, noise, temperature rise, dimensions, weight) are not in the product library: those rows stay at an em dash until the factory parameter sheet is supplied. An em dash means the value is unavailable — it is never rendered as zero.
Read-only: no price factor, not part of the sum — the loss-grade cost is already carried by the efficiency (subtype) base price, so charging here would double-bill. Values come from the product library type-test data, interpolated between published capacities; grades the library does not cover show an em dash, never zero.
SCB13 及同损耗档（SCB13 / SG13 / SCL13 / SCR，Class 3）
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Application Scenarios
Commercial Buildings
Power distribution for malls and office towers with fire-safe solutions eliminating oil leakage risks.
Hospitals & Healthcare
Reliable power for medical equipment and life-support systems with low-noise operation.
Data Centers
High-efficiency distribution for server rooms supporting 24/7 operation.
Industrial Facilities
Safe oil-free electrical distribution for manufacturing plants.
Renewable Energy
Auxiliary power for solar and wind farms with excellent overload capacity.
Underground Installations
Ideal for metro stations and underground parking where fire regulations prohibit oil-filled equipment.
Technical Advantages
Fire-Safe Design
Cast resin insulation with self-extinguishing properties eliminates fire hazards.
Zero Maintenance
No oil changes or leak management needed throughout service life.
Low Noise
Advanced core construction achieves noise below 45 dB.
Eco-Friendly
No insulating oil, zero contamination risk, fully recyclable.
FAQ - Dry-Type Transformers
What is the difference between cast resin and open-wound dry-type transformers?
What standards do they comply with?
Can dry-type transformers be installed outdoors?
What is the expected service life?
How to select the right capacity?
When should I choose dry-type over oil-immersed?
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Cast Resin vs VPI vs Oil-Immersed: How to Choose
| Cast Resin (SCB) | VPI Open-Wound | Oil-Immersed | |
|---|---|---|---|
| Insulation & construction | Epoxy resin cast under vacuum — windings sealed against moisture and dust | Windings impregnated with resin under vacuum pressure — open, ventilated structure | Mineral insulating oil with paper insulation, sealed tank |
| Fire safety & location | Self-extinguishing, no oil — suitable for indoor occupied spaces | No oil, fire-retardant Class F insulation — indoor use | Needs oil containment and fire separation — outdoor or dedicated room |
| Cooling | AN / AF | AN / AF — open structure dissipates heat better | ONAN / ONAF / OFAF |
| Maintenance | No oil checks or leak management over service life | No oil checks or leak management over service life | Oil testing on a periodic schedule; no top-ups on sealed designs |
| Typical applications | Data centres, hospitals, commercial towers, metro stations | Industrial plants and renewables auxiliary power where cost per kVA matters | Outdoor distribution, utility and high-capacity duty |
Where QDTB® Dry-Type Transformers Are Specified
Dry-type units are specified where oil is not acceptable: inside occupied buildings, below-grade electrical rooms, and anywhere an oil load or containment basin would be a liability. Data centres and telecom rooms choose cast resin units for their high short-time overload capability and low partial discharge; hospitals and commercial towers choose them for silent, maintenance-free operation next to occupied space.
Metro and underground installations rely on the oil-free design because fire regulations in tunnels and stations prohibit oil-filled equipment, while solar and wind projects use dry-type units as auxiliary station transformers where ambient and seismic conditions make oil handling impractical.
Frequently Asked Questions
What is the difference between cast resin and open-wound dry-type transformers?
Cast resin uses epoxy encapsulation for superior moisture resistance. Open-wound (VPI) offers better heat dissipation and lower cost.
What standards do they comply with?
IEC 60076-11, GB/T 1094.11, CE certified for Europe, IEEE available on request.
Can dry-type transformers be installed outdoors?
Yes, with IP23D/IP54 enclosure options. Cast resin provides inherent moisture resistance.
What is the expected service life?
Over 30 years with proper ventilation. Class F insulation ensures long-term reliability.
How to select the right capacity?
Operate at 70-80% of rated capacity for optimal efficiency. Consider future expansion needs.
When should I choose dry-type over oil-immersed?
For indoor, occupied, or fire-sensitive locations - hospitals, data centers, commercial buildings, and underground installations. Dry-type needs no oil containment or leak management; oil-immersed is better for outdoor, high-capacity utility duty.