Perfect for Indoor & Critical Applications – No Oil, No Risk!
01 General
1.1 Project Description
160 kVA resin cast dry type transformer was delivered to Georgia in 2025. The rated power of the transformer is 160 kVA with ONAN cooling. The primary voltage is 10 kV with ±2*2.5% tapping range (NLTC), the secondary voltage is 0.4 kV, they formed a vector group of Dyn11.
Cast resin dry type transformers represent a safe, eco-friendly, and high-performance alternative to traditional oil-filled transformers, featuring epoxy resin-encapsulated windings that eliminate fire risks and maintenance needs. These transformers are non-flammable (meeting IEC 60076-11 standards), resistant to moisture, dust, and chemical corrosion, and operate silently (<55 dB) with minimal cooling requirements. Ideal for indoor, urban, and sensitive environments-such as hospitals, data centers, and renewable energy plants-they offer high efficiency (up to 99%), low partial discharge, and a 30+ year lifespan. Their compact, oil-free design ensures easy installation in harsh conditions (coastal, industrial, or offshore), while compliance with IEC, IEEE, and UL standards guarantees reliability.
With IoT-ready monitoring capabilities and zero environmental hazards, cast resin transformers are the modern choice for sustainable and safe power distribution.
1.2 Technical Specification
160 kVA resin cast dry type transformer specification and data sheet
| Delivered to | Georgia |
| Year | 2025 |
| Type | Resin cast dry type transformer |
| Core material | Grain oriented silicon steel sheet |
| Standard | IEC60076-11, EN50541-1, ISO9001, ISO14001 |
| Rated Power | 160kVA |
| Frequency | 50HZ |
| Vector group | Dyn11 |
| Phase | 3 |
| Cooling Type | ONAN |
| Primary Voltage | 10 kV |
| Secondary Voltage | 0.4 kV |
| Winding Material | Aluminum |
| Impedance | 6% |
| Tap Changer | NLTC |
| Tapping Range | ±2*2.5%@primary side |
| No Load Loss | 0.55 kW |
| On Load Loss | 2.4 kW |
| Insulation level | F |
1.3 Drawings
160 kVA resin cast dry type transformer diagram drawing and size.
02 Manufacturing
2.1 Core
| The cast resin dry-type transformer core utilizes high-grade CRGO silicon steel (0.23-0.30mm) with 45° full-step-lap mitered joints and hydrogen annealing (800-850°C) to achieve ultra-low no-load loss (≤1.0W/kg), quiet operation (<55dB), and high efficiency (IE4 class) at 1.6-1.7T flux density, while C6-class insulation coating and elastic spacers ensure thermal stability, complying with IEC 60076-11 standards. |  |
2.2 Winding
 | The cast resin dry-type transformer coil features vacuum-encapsulated copper windings (HV: precision-wound wire, LV: wire/foil) in unfilled epoxy resin, forming a mechanically robust cylindrical structure with exceptional partial discharge resistance (≤10pC). Its thin resin layers enable efficient AN cooling while providing moisture-proof (100% RH capable), flame-retardant, and explosion-proof properties. The design delivers high dielectric strength (75kV lightning withstand), short-circuit resistance, and maintenance-free operation in a compact, lightweight package suitable for load-center installation. |
2.3 Final Assembly
| 1. Main body assembly • The core and coil are assembled with an elastic support structure, with a 5-8mm expansion gap reserved • Set up multiple layers of magnetic shielding to reduce stray losses by 15-20% 2. Electrical Connections • HV side: Cable chamber or bushing kits • LV side: Copper busbar or cable terminals 3. Protection Structure • IP20 enclosure (stainless steel or Al-Zn coated steel options) • Pressure relief channels (burst pressure ≥0.5MPa) |  |
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 |
| 0.33% | 1.68% | |||||
| 2 | Measurement of voltage ratio and check of phase displacement | / | The tolerance of voltage ratio on the principal tapping: ±1/10 Connection symbol: Dyn11 | 0.00% ~ 0.13% Dyn11 | Pass | |
| 3 | Measurement of Short-circuit Impedance and Load Loss | / kW kW | t:120℃ Z%: measured value Pk: measured value Pt: measured value | 3.90% 1.402 1.943 | 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 | 0.81 0.450 | Pass |
| 100% Ur | 0.90 0.501 | |||||
| 110% Ur | 0.99 0.551 | |||||
| 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): 0.8 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
4.1 Packing
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4.2 Shipping
 | • Manufacturer’s Responsibility Deliver the transformer properly packed to Shanghai Port (agreed terminal). Provide complete export documentation (Packing List, Commercial Invoice, IEC Certification, etc.). Ensure cargo is loaded securely onto the vessel (but risk transfers to buyer upon loading).Our cast resin dry-type transformers represent the perfect blend of innovation, efficiency, and sustainability. Designed with superior insulation, minimal energy loss, and maintenance-free operation, they are the ideal choice for industrial, commercial, renewable energy, and demanding environmental applications. With a strong focus on safety and reliability, we deliver energy-saving, low-emission solutions that support a greener power infrastructure. Powering Progress, Shaping the Future. |
05 Site And Summary
Our cast resin dry-type transformers represent the perfect blend of innovation, efficiency, and sustainability. Designed with superior insulation, minimal energy loss, and maintenance-free operation, they are the ideal choice for industrial, commercial, renewable energy, and demanding environmental applications. With a strong focus on safety and reliability, we deliver energy-saving, low-emission solutions that support a greener power infrastructure.
Powering Progress, Shaping the Future.
