Engineered for Excellence – Resin Cast Dry Type Transformer, High Performance!
01 General
1.1 Project Description
1000/1250 kVA cast resin type transformer was delivered to Malaysia in 2025. The rated power of the dry type transformer is 1000/1250 kVA with ONAN/ONAF cooling. The primary voltage is 0.415d kV, the secondary voltage is 3.3/6.6+2*10% kV (3.3/3.63/3.96 or 6.6/7.26/7.92 kV) with ±2*10% tapping range (NLTC), they formed a vector group of Yd11.
Introducing our high-performance 1000/1250kVA resin cast dry-type transformer, designed for reliable engine testing and industrial power applications. This robust unit features a versatile 0.415-3.3/6.6kV output with ±2×10% no-load tap changing capability and a built-in 3.3kV/6.6kV selector switch for flexible voltage adjustment.
The flame-retardant resin cast construction ensures superior safety with no fire or leakage risks, while integrated cooling fans and temperature monitoring maintain optimal thermal performance. Housed in a protective enclosure with mobility wheels, this transformer combines industrial-grade durability with convenient portability.
Ideal for demanding environments like motor testing facilities, mining operations, and renewable energy systems, our maintenance-free solution delivers precise voltage control, exceptional reliability, and complete peace of mind for your high-voltage power requirements.
1.2 Technical Specification
1000/1250 kVA cast resin type transformer specification and data sheet
| Delivered to | Malaysia |
| Year | 2025 |
| Type | Resin cast dry type transformer |
| Core material | Grain oriented silicon steel sheet |
| Standard | IEC60076 |
| Rated Power | 1000/1250kVA |
| Frequency | 50HZ |
| Phase | Three |
| Vector group | Yd11 |
| Cooling Type | ONAN/ONAF |
| Primary Voltage | 0.415d kV |
| Secondary Voltage | 3.3/6.6+2*10%Y kV |
| Winding Material | Copper |
| Impedance | 6% |
| Tap Changer | NLTC |
| Tapping Range | ±2*10%@secondary voltage |
| No Load Loss | 1.65KW |
| On Load Loss | 8.8 KW |
| Insulation level | F |
1.3 Drawings
1000/1250kVA cast resin type transformer diagram drawing and size.
02 Manufacturing
2.1 Core
This cast resin type transformer features a silicon steel laminated core with 45° skewed joints and epoxy binding, reducing no-load loss by 20% versus standards. With optimized 1.65-1.72T flux density, ≤75K temperature rise (Class F), and ≤55dB noise, it’s ideal for demanding applications like engine testing, ensuring 20+ years maintenance-free operation.
2.2 Winding
 | The transformer winding utilizes high-purity copper conductors with multi-layer insulation, ensuring excellent electrical and mechanical performance. The HV winding employs sectional layer winding for optimized electric field distribution, while the LV winding uses foil design for enhanced short-circuit resistance. Encapsulated by vacuum-cast epoxy resin, the winding forms a robust and thermally conductive insulation system, resistant to moisture, dust, and partial discharge. The resin’s high thermal conductivity, combined with built-in cooling ducts and fans, ensures stable temperature rise and overload capability. |
2.3 Final Assembly
| The cast resin type transformer features modular assembly design, integrating vacuum-cast epoxy windings with high-permeability silicon steel cores, secured by insulating spacers and clamping mechanisms. Equipped with off-load tap changer (±2×10%) and 3.3kV/6.6kV voltage selector, it incorporates smart temperature control and forced-air cooling. Optional IP20 enclosures provide robust protection, offering vibration resistance, maintenance-free operation and low noise. |  |
03 Testing
| 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 | ||
| 0.96% | 0.68% | |||||||
| 0.25% | ||||||||
| 2 | Measurement of voltage ratio and check of phase displacement | / | The tolerance of voltage ratio on the principal tapping: ±1/10 Connection symbol: Yd11 | -0.26% ~ 0.15% Yd11 | Pass | |||
| 3 | Measurement of No-load Loss and Current at 90%,100%and 110% of rated voltage | / kW | I0 :: provide measured value P0: provide measured value | 90%Ur | 100%Ur | 110%Ur | Pass | |
| 0.27 1.395 | 0.30 1.551 | 0.33 1.706 | ||||||
| 4 | Load Losses,Impedance Voltage | / kW kW | t:120℃ Z%: measured value Pk: measured value Pt: measured value | 6.06% 6.173 8.148 | Pass | |||
| 5 | Applied Voltage Test | / | HV: 20kV 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): 0.83 Duration(s):40 Frequency (HZ): 150 | No collapse of the test voltage occurs | Pass | |||
| 7 | Partial Discharge Test | pC | The maximum level of partial discharges shall be 10 pC | ＜10 | Pass | |||
04 Packing and Shipping
05 Site And Summary
SCOTECH cast resin type transformer set new benchmarks with maintenance-free operation, superior dielectric strength, and longtime lifespan.
From harsh industrial sites to smart grid applications, our ISO-certified manufacturing and customized solutions deliver safe, efficient, and sustainable power conversion. Contact our engineering team today for your tailored power solution!
