Efficiency meets durability with our 30 kVA dry type transformer
01 General
1.1 Project Description
This compact 30 kVA cast-resin dry-type transformer is designed for reliable medium and low voltage power distribution. Engineered for seamless voltage transformation from 11 kV to 0.22 kV, this transformer supports up to 30 kVA of load. Featuring a Yd11 type vector group. This transformer is equipped with a no-load tap changer (NLTC) with an adjustment range of ±2 × 2.5%. Guarantees robust voltage regulation under sudden load shifts, ensuring uninterrupted power quality.
This dry-type transformer utilizes higher-quality raw materials. The primary core is constructed of grain-oriented silicon steel, which reduces iron losses and improves efficiency. The secondary copper winding offers excellent conductivity. Third-point Class F insulation allows operation at temperatures up to 155°C, making it ideal for hot climates such as the UAE. Superior quality materials, superior design and expert craftsmanship deliver long-standing performance.
Efficiency and Losses: This 30 kva dry type transformer has no-load losses of 0.12 kW and loaded losses of 0.75 kW, minimizing energy waste while maintaining performance. A 4% impedance limits short-circuit current and maintains stable voltage under load.
1.2 Technical Specification
30kVA Resin cast dry type transformer specification and data sheet
| Delivered to | United Arab Emirates |
| Year | 2025 |
| Type | Resin cast dry type transformer |
| Core material | Grain oriented silicon steel sheet |
| Standard | IEC |
| Rated Power | 30kVA |
| Frequency | 50HZ |
| Phase | Single |
| Vector group | Ii0 |
| Cooling Type | AN |
| Primary Voltage | 11KV |
| Secondary Voltage | 0.22kV |
| Winding Material | Copper |
| Impedance | 4% |
| Tap Changer | NLTC |
| Tapping Range | ±2*2.5%@primary voltage |
| No Load Loss | 0.12 kW |
| On Load Loss | 0.75 kW |
| Insulation level | F |
| Accessories | Temperature controller, Enclosure |
1.3 Drawings
30kVA Resin cast dry type transformer dimensions and weight details
02 Manufacturing
2.1 Core
The core design of our single-phase dry-type transformer uses grain-oriented silicon steel sheets. It gives good performance and keeps the unit small and light. This is helpful where space is limited, like in homes, small shops, and light industrial use. |  |
2.2 Winding
 | The 30 kVA dry-type transformer’s coils also utilize high-quality copper conductors to ensure low losses and excellent mechanical strength. The windings utilize a Class F (155°C) insulation system, combined with epoxy resin integral casting technology, providing excellent resistance to moisture, dust, and short circuits, ensuring stable and reliable operation for customers.
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2.3 IP20 Enclosure
Our dry-type transformer uses an IP20 enclosure, which prevents solid objects larger than 12.5 mm, such as accidental human contact with live parts, from entering. It protects against electric shock and ensures basic safety, making it suitable for indoor installation of dry-type transformers. | |
2.4 Final Assembly
 | The fabricated core and winding components are assembled, during which electrical connections, insulation, and structural fixation are performed. |
03 Testing
Routine Test and Testing Standard
IEC 60076-1-2011 Power Transformers – Part 1: General
IEC 60076-3-2013 Power Transformers – Part 3: Insulation levels, dielectric tests and external clearances in air
IEC 60076-11-2018 RLV Power Transformers – Part 11: Dry type transformer
- Measurement of winding resistance
- Measurement of voltage ratio and check of phase displacement
- Measurement of short-circuit impedance and load loss
- Measurement of no load loss and current
- Applied voltage test
- Induced voltage withstand test
- Partial discharge test
One of 30 kva dry type transformers Test Results
| No. | Test Item | Unit | Acceptance Values | Measured Values | Conclusion | |
| 1 | Measurement of winding resistance | / | Maximum resistance unbalance rate Line resistance:≤2% | HV (line) | LV (line) | Pass
|
| / | / | |||||
| 2 | Measurement of voltage ratio and check of phase displacement
| / | The tolerance of voltage ratio on the principal tapping: ±1/10 Connection symbol: Ii0 | 0.02% ~ 0.06% Ii0 | Pass
| |
| 3 | Measurement of Short-circuit Impedance and Load Loss | / kW kW | t:120℃ Z%: measured value Pk: measured value Pt: measured value | 4.03% 0.595 0.808 | Pass
| |
| 4 | Measurement of No-load Loss and Current at 90% and 110% of rated voltage | / kW | I0 :: provide measured value P0: provide measured value | 90% Ur | 1.36 0.0846 | Pass
|
| 100% Ur | 1.4 0.094 | |||||
| 110% Ur | 1.54 0.1034 | |||||
| 5 | Applied Voltage Test | / | HV: 28kV 60s LV: 3kV 60s | No collapse of the test voltage occurs | Pass
| |
| 6 | Induced Voltage Withstand Test | / | Applied voltage (KV): 2 Ur Induced voltage (KV): 0.44 Duration(s):40 Frequency (HZ): 150 | No collapse of the test voltage occurs | Pass
| |
04 Packing and Shipping
05 Site And Summary
The Scotech 30 kVA Cast Resin Dry-Type Transformer provides safe and efficient medium- to low-voltage power for homes, offices, shops, schools, and small factories. It has a silicon steel core and copper windings fully covered in epoxy resin, works without oil, and can operate in hot, humid, or dusty environments.
With a No-Load Tap Changer (NLTC) for stable voltage and an IP20 enclosure for safety, it delivers reliable power with low losses and Class F insulation for high-temperature operation.
