Please Choose Your Language
The 100kVA Dry Type Transformer is a three-phase, oil-free transformer designed for safe and reliable electrical power distribution. It uses air as the cooling medium and can be supplied in cast resin, VPI, or other dry-type configurations according to project requirements.
A typical configuration is 10kV / 0.4kV, 100kVA, 50Hz, Dyn11, although the primary and secondary voltages, vector group, impedance, enclosure and other parameters can be customized.
The transformer complies with IEC 60076-11, the international standard covering dry-type power transformers.
Parameter | Standard Specification |
|---|---|
Rated Capacity | 100 kVA |
Phase | Three Phase |
Frequency | 50 / 60 Hz |
HV Voltage | 10 kV |
LV Voltage | 0.4 kV / 400 V |
Voltage Ratio | 10 / 0.4 kV |
Vector Group | Dyn11 |
Cooling Method | AN / AF |
Insulation Type | Cast Resin |
Insulation Class | F / H |
Impedance | 4% typical |
HV Tapping | ±2 × 2.5% or ±5% |
Winding Material | Copper / Aluminum |
Temperature Rise | ≤100 K typical |
Installation | Indoor / Outdoor with enclosure |
Protection | IP00 / IP20 / IP21 / IP31 etc. |
Standard | IEC 60076-11 |
Ambient Temperature | Typically -25°C to +40°C |
Altitude | ≤1000 m standard; higher altitude available |
Actual loss, dimensions, weight, noise level and other values should be finalized according to the selected design and applicable efficiency standard. Published 100kVA designs show considerable variation in these parameters.
For a standard 100kVA / 10kV / 0.4kV transformer, a representative technical configuration is:
Item | Typical Value |
|---|---|
Rated Power | 100 kVA |
HV | 10 kV |
LV | 400 V |
Frequency | 50 Hz |
Vector Group | Dyn11 |
Impedance | 4% |
No-load Loss | Approx. 200–400 W |
Load Loss | Approx. 1.4–1.8 kW |
Cooling | AN |
Insulation | Class F |
Temperature Rise | ≤100 K |
HV Tap | ±2 × 2.5% |
Noise | Approx. 50–60 dB(A) |
Core | Grain-oriented electrical steel |
Winding | Copper / Aluminum |
For example, published 100kVA designs list 220W no-load loss and 1,400W load loss, while other IEC-oriented designs specify 252W and 1,800W respectively. This demonstrates why the final datasheet should use the manufacturer's project-specific guaranteed values rather than generic figures.
No transformer oil is required, eliminating oil leakage and significantly reducing fire and environmental risks.
Cast-resin insulation provides strong fire-retardant characteristics and is particularly suitable for buildings and indoor electrical rooms.
The dry-type structure eliminates oil testing, oil replacement and many maintenance requirements associated with oil-immersed transformers.
Vacuum-cast epoxy resin provides strong electrical insulation and mechanical protection for the windings.
The cast windings have strong mechanical stability and can withstand electromagnetic forces during short-circuit conditions.
Optimized magnetic core and winding structures help reduce operating noise, making the transformer suitable for commercial and industrial buildings.
HV/LV voltage, vector group, impedance, winding material, enclosure, cooling method and monitoring system can be customized.
The transformer core is manufactured from high-quality grain-oriented electrical steel with optimized magnetic flux distribution.
Typical construction includes:
Step-lap core assembly
Low magnetic flux density
Reduced no-load loss
Reduced operating noise
High mechanical strength
High-quality insulation between laminations
The HV winding can use copper or aluminum conductors and is insulated using cast resin or VPI technology depending on the selected transformer design.
For cast-resin transformers, vacuum casting helps reduce internal voids and improve insulation reliability.
The LV winding is designed to provide:
Low electrical resistance
Good heat dissipation
Strong short-circuit capability
Stable voltage performance
For cast-resin versions, the winding is encapsulated with epoxy resin to protect the conductor and insulation system against moisture, dust and environmental contamination.
The standard cooling method is:
AN — Air Natural
Natural air circulation removes heat from the transformer during normal operation.
An optional:
AF — Air Forced
system can be installed using cooling fans. Forced-air cooling can increase the transformer's available output under appropriate operating conditions, but the actual permissible capacity must be determined by the manufacturer's thermal design.
Optional components include:
Cooling fans
Fan control cabinet
PT100 temperature sensors
Digital temperature controller
Over-temperature alarm
Trip protection
A temperature monitoring system can be supplied for projects requiring enhanced protection.
Typical configuration:
PT100 Sensors → Temperature Controller → Alarm / Trip → Cooling Fan Control
Functions can include:
Real-time winding temperature monitoring
High-temperature alarm
Over-temperature trip
Automatic fan starting
Automatic fan stopping
Fault indication
RS485 / Modbus communication
Temperature monitoring and communication options are commonly available for modern dry-type transformer designs.
The basic transformer can be supplied as an IP00 open type unit for installation inside a dedicated transformer room.
For greater protection, it can be equipped with a metal enclosure.
Typical options:
IP20 → IP21 → IP31 → IP41
The enclosure can be customized according to:
Indoor installation
Outdoor installation
Dusty environments
Industrial environments
Mining applications
Coastal environments
High-humidity areas
IEC 60076-11 specifically addresses environmental, climatic, fire-behavior and enclosure-related considerations for dry-type transformers.
The 100kVA Dry Type Transformer can be customized according to EPC and project specifications.
6kV
6.3kV
6.6kV
10kV
10.5kV
11kV
13.8kV
20kV
22kV
33kV
LV options:
380V
400V
415V
440V
460V
480V
690V
Copper winding
Aluminum winding
Dyn11
Yyn0
Dual secondary winding
±2 × 2.5% tapping
±5% tapping
AN / AF cooling
IP-rated enclosure
Temperature controller
PT100
RS485 / Modbus
Surge protection
Anti-condensation heater
Outdoor housing
Seismic design
High-altitude design
5
The 100kVA dry-type transformer is suitable for:
Factories, workshops, manufacturing plants and machinery power distribution.
Shopping centers, office buildings, hotels and commercial complexes.
Suitable for locations where fire safety and reliable indoor power distribution are important.
Can be integrated into low-voltage and medium-voltage power distribution systems.
Suitable for solar PV systems, energy storage systems and other renewable-energy applications.
Airports, railway systems, tunnels, ports and public facilities.
Special configurations can be designed for demanding industrial and mining environments.
Dry-type transformers are widely used in buildings, industrial plants, hospitals, airports and other applications where oil-free and fire-safe power distribution is advantageous.
Each transformer should undergo appropriate factory testing before shipment.
Winding resistance test
Voltage ratio test
Vector group / phase displacement test
No-load loss measurement
No-load current measurement
Short-circuit impedance measurement
Load loss measurement
Applied voltage withstand test
Induced voltage withstand test
Insulation resistance test
Depending on project requirements:
Partial discharge test
Temperature-rise test
Lightning impulse test
Noise test
Short-circuit test
Fire behavior test
Enclosure protection test
Climatic/environmental tests
For EPC projects, the manufacturer can provide a Factory Test Report (FAT) and supporting quality documentation.
The transformer should be properly protected before international transportation.
Typical packaging:
Transformer → Moisture Protection → Shock Protection → Wooden Case / Steel Frame → Container Loading
Export packaging can include:
Waterproof film
Moisture-proof protection
Anti-collision protection
Reinforced wooden case
Steel base
Lifting points
Shock-resistant fixing
Nameplate and shipping marks
For EPC projects, packing can be customized according to the destination country, transportation method and site requirements.
For a typical overseas EPC project, I would recommend presenting the product specification like this:
100kVA Dry Type Transformer
10kV / 0.4kV | 50Hz | 3 Phase
Cast Resin | Dyn11 | AN/AF
IEC 60076-11
Copper / Aluminum Windings
Custom Voltage & Enclosure
Factory Tested Before Delivery
This is more suitable for an international product page than simply listing “100kVA Dry Type Transformer”, because EPC buyers usually need to quickly confirm capacity + voltage + standard + cooling + vector group + customization capability.
100kVA Dry Type Transformer | 10kV to 0.4kV | IEC 60076-11
Safe. Oil-Free. Custom-Engineered.
Designed for industrial, commercial, infrastructure and renewable-energy power distribution projects, with customized voltage, insulation, enclosure, cooling and protection options.
