Dry-type distribution transformer
Dry-type distribution transformer
If you are unable to open the video, please click the link to view it on our social media.
https://www.facebook.com/reel/1361612595855110
Dry-Type Distribution Transformer | XIAOPAI Power Equipment
A dry-type distribution transformer uses air as the cooling and insulating medium instead of oil. There is no combustible liquid, no oil containment, and no risk of leakage into the ground. That single difference is why dry-type units are specified for indoor substations, commercial buildings, hospitals, tunnels and industrial plants where fire safety and ventilation rule out oil.
KEY SPECIFICATIONS
Cooling and insulation: Air, with cast resin (SC(B) series) or vacuum pressure impregnated windings
Typical capacity range: Distribution class, commonly 100 kVA to 2500 kVA
Typical voltage class: Up to 35 kV, with designs to 72.5 kV available under IEC 60076-11
Fire behaviour classes: F0 to F2 as defined in IEC 60076-11
Environmental classes: E0 to E5, covering condensation and pollution severity
Climatic classes: C1 to C6, covering transport, storage and operation temperature
Temperature monitoring: Pt100 sensors in windings with alarm and trip contacts (common on larger units)
Enclosure: IP00 to IP23 indoor enclosures, or outdoor enclosure on request
WHY THIS MATTERS
Dry-type costs more than an equivalent oil unit, and it is the right choice when the installation is indoor, occupied, or fire-regulated. Insurance classification, ventilation limits and the absence of an oil pit usually decide the matter before electrical parameters do.
TYPICAL APPLICATIONS
High-rise commercial and residential buildings
Hospitals, schools and public buildings
Shopping malls and underground car parks
Tunnels, metros and marine vessels
Industrial plants with indoor substations
Data centres and telecom facilities
BUYING THROUGH XIAOPAI
XIAOPAI (Wenzhou Xiaopai Power Technology) runs two equipment modules, flexible packaging equipment and power transmission equipment, and works as a foreign-trade service provider and authorized distributor, not a factory. We source power equipment against your specification, then carry the export documentation, factory audit, installation supervision and after-sales that a factory-direct purchase usually leaves to you. Type test reports to IEC 60076 or GB 1094 are supplied with each transformer, and IEC 62271-100 reports with each breaker.
FAQ
Q1: Is a dry-type transformer completely fire-proof?
A1: No transformer is fire-proof, but dry-type carries fire-behaviour classifications F0 to F2 under IEC 60076-11 and contains no combustible liquid. This is why it is accepted indoors and in occupied buildings where oil units are not.
Q2: Can a dry-type unit be installed outdoors?
A2: Yes with a suitable enclosure, but it is not the default. Outdoor duty needs an enclosure rated for the environment, and most outdoor distribution uses oil-immersed because it is more economical at the same rating.
Q3: What capacity limit should I plan around?
A3: Dry-type is mainstream up to about 2500 kVA and 35 kV. Larger and higher-voltage designs exist but become a niche choice. Above that range, oil-immersed is the practical answer.
RELATED GUIDES
Before you request a quotation, these related articles and standards may be useful:
[ Dry-Type vs Oil-Immersed Transformer: How to Choose (2026) ]
[ Dry-Type vs Oil-Immersed Transformer: True Cost & Capacity Limits (2026) ]
[ SC(B) Dry-Type Transformer ]
External standards:
[ IEC 62271-100 ]
[ IEC 60076-11 ]
