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Oil-Free Transformers for Indoor and Fire-Sensitive Sites
Yuantong builds vacuum cast epoxy resin SC(B) and vacuum-impregnated SG(B) dry-type transformers from 10 kV to 35 kV. With no insulating oil, they are the safe choice for commercial buildings, hospitals, data centres, tunnels and industrial plants. Every unit is routine-tested in our 220 kV test station before it ships.
BASIC PARAMETERS
Technical Parameters at a Glance
| Item | Range |
|---|---|
| Rated voltage (HV) | 6, 10, 20, 35 kV |
| Rated capacity | 30 – 25,000 kVA |
| Low voltage | 0.4 kV or as specified |
| Vector group | Dyn11 / Yyn0, others on request |
| Insulation class | F (cast resin) / H (SG(B), SCRB) |
| Cooling | AN / AF (forced air with fans) |
| Efficiency | Level 1, 2 or 3 to GB 20052 (SCB14, SCB18) |
| Standards | IEC 60076-11, GB/T 1094.11 |
Need a rating outside these ranges? We design to your specification.
PRODUCT RANGE
Dry-Type Transformer Models
Choose a series to see full specifications, or send us your rating for a direct quotation.
Showing all 6 results
SELECTION GUIDE
Which Dry-Type Series Fits Your Project?
| Series | Voltage | Capacity | Insulation | Best for |
|---|---|---|---|---|
| SC(B) 6–11 kV | 6–11 kV | 30–2,500 kVA | Class F, cast resin | Buildings, commercial distribution |
| SC(B) 20–35 kV | 20–35 kV | Up to 25,000 kVA | Class F, cast resin | Industrial plants, renewable collector systems |
| SCRB10 | 6–11 kV | 30–2,500 kVA | Class H | High ambient temperature, compact rooms |
| 3D wound core | 10 kV | Per datasheet | Class F, cast resin | Projects that need the lowest no-load loss |
| SG(B)11 isolation | Low voltage | Per datasheet | Class H, VPI | Isolation and control circuits |
CONSTRUCTION & CHARACTERISTICS
How Our Dry-Type Transformers Are Built
APPLICATIONS
Where Our Dry-Type Transformers Are Used
Commercial & Data Centres
Indoor substations close to the load
Grid & Substations
Urban distribution networks
Wind & Solar
Collector and auxiliary transformers
Mining & Industrial
Plants, workshops and tunnels
QUALITY & TESTING
Tested Before It Leaves the Factory
PROJECT REFERENCES
Dry-Type Transformer Projects
FAQ
Dry-Type Transformer FAQ
Cast resin (SC(B)) windings are fully encapsulated in epoxy under vacuum, which protects them from moisture and dust. VPI (SG(B)) windings are vacuum-impregnated and run at Class H temperature. We recommend the type that suits your installation room and specification.
SCB18 has lower no-load and load losses than SCB14 and suits projects that require Level 1 efficiency or a low lifetime energy cost. SCB14 has a lower purchase price. We state the loss values for each rating in our quotation.
Yes. We supply units without an enclosure for switch rooms, or with a protective enclosure. Tell us the required protection degree and we will design the enclosure to suit.
The minimum order is one unit. Standard ratings typically ship 15–30 days after the order and deposit are confirmed; custom designs depend on the specification.
We design to IEC 60076-11 or GB standards, or to the standard named in your specification. A routine test report is supplied with every unit.
GET A QUOTE
Quotation Within 24 Hours
Send us your specification and our engineers will reply with a technical offer, loss values and lead time.
Include these details for a fast quote:
- Rated capacity (kVA)
- HV / LV voltage and vector group
- Required efficiency level or loss values
- Standard (IEC, GB or other)
- Enclosure and installation site
- Quantity and destination port