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The 11kV cast-resin dry-type transformer is a core equipment for medium-voltage distribution systems. Utilizing a vacuum-cast epoxy resin insulation and air convection cooling design, it combines the benefits of being oil-free, eco-friendly, and highly flame-retardant with exceptional electrical stability. It is perfectly suited for 11kV distribution scenarios with strict safety requirements, such as industrial parks, commercial complexes, large hospitals, data centers, and high-precision manufacturing plants. Capable of operating reliably in standard climates (-25℃ to 40℃), it effectively meets the transmission and distribution needs of medium-capacity systems.
Core Parameters:
• Energy Efficiency: Tier 2 Efficiency (Complies with GB 20052-2024).
• Structure: Resin Cast Insulation + Air Convection Cooling (Fully enclosed, dustproof, moisture-proof).
• Warranty: 3-Year Standard Warranty.
Product Features
Resin cast insulation means oil-free operation with excellent flame retardant and self-extinguishing properties, eliminating explosion risks. Zero emissions make it perfect for populated areas.
Tier 2 efficiency and pure copper windings drastically reduce running losses. The resin structure resists moisture and dust corrosion, achieving a design lifespan of over 25 years.
Equipped with smart temp controllers, overheat alarms, and short-circuit protection. The fully enclosed structure safely handles complex indoor or semi-outdoor environments.
Compact design supports indoor wall-mounting, floor installation, or simplified outdoor setups without needing oil pits. Offers a 1.2x overload capacity for peak power periods.
No oil testing is required. Simply clean the cooling channels periodically and inspect the resin insulation state. Mature technology ensures a very low failure rate and minimal O&M costs.
Designed with a low-noise core and vibration-absorbing mounts. Operational noise is 5~8dB lower than traditional oil-immersed models, making it highly suitable for hospitals and schools.
Key Specifications (11kV Dry-Type)
| Parameter | Typical Value | Description |
| Rated Capacity | Custom (e.g., 50kVA - 500kVA) | Tailored to match specific loads, satisfying different medium-capacity distribution needs. |
| Rated Voltage | HV: 11kV | LV: 0.4kV | Customizable inputs (e.g., 6kV, 10kV) to adapt to varying medium-voltage grid standards. |
| Vector Group | Dyn11 / Yyn0 | Mainstream connection groups ensuring simple wiring and compatibility with 3-phase systems. |
| Impedance | 4.5%~6.5% | Standard 5%~6% limits short-circuit currents, protecting downstream distribution equipment. |
| No-Load Loss | ≤ 0.22kW | Tier 2 compliant; low idle energy consumption saves substantial electricity costs. |
| Load Loss (120℃) | ≤ 1.4kW | Copper windings reduce resistance losses, converting energy highly efficiently. |
| Winding Temp. Rise | ≤ 100K (Class F) | Resin insulation and air convection synergistically prevent high-temp insulation aging. |
| Noise Level | ≤ 45~50dB(A) | Shock-absorbing design makes it ideal for noise-sensitive, densely populated facilities. |
| Cooling Method | AN / AF | Natural air cooling for standard loads; forced air (AF) can boost capacity by 30%. |
Detailed Description
The 11kV cast-resin dry-type transformer (represented by mainstream SCB13 series) is a three-phase, Tier 2 efficiency distribution equipment utilizing resin-cast insulation and an air convection cooling system. It serves as a superior solution for medium-capacity 11kV distribution networks across the country. Its primary advantage is its exceptional safety and eco-friendliness, equipped with complete insulation and thermal regulation systems to thrive in confined or densely populated environments.
The vacuum-cast resin structure effectively isolates the windings from moisture and dust, preventing insulation degradation. Crucially, it is highly flame retardant and self-extinguishing, thoroughly eliminating the leak and fire hazards associated with oil-immersed transformers. Copper windings ensure low electrical resistance, while the air cooling design achieves highly stable, low-loss operation. Delivering robust overload capacity and adapting perfectly from -25℃ to 40℃, it provides dependable power support for high-precision operations and critical public infrastructure.
SCB10 Type Parameters & Scenarios
| Parameter | Typical Value | Description |
| Energy Efficiency | GB 20052-2024 Tier 2 (NX2) | Adapts to basic energy-saving compliance requirements. |
| No-Load Loss | Approx. 0.28kW | Slightly higher than SCB13, fulfilling fundamental medium-voltage needs. |
| Load Loss (120℃) | Approx. 1.4kW | Consistent with the SCB13 model of the same capacity. |
| Partial Discharge | ≤ 10pC | Reliable insulation performance, ensuring operational safety. |
| Core Material | Standard High-Grade Silicon Steel | Balances magnetic permeability and cost for conventional operations. |
| Applicable Scenarios | Budget-limited, load ≤ 60% | Ideal for 11kV networks covering ordinary residential areas, small retail hubs, and older grid upgrades where basic safe power is required. |
Standard SCB13 Series Technical Reference
| Capacity (kVA) | Impedance (%) | No-Load Loss (W) | Load Loss (W) | Total Weight (kg) | Dimensions W×D×H (mm) |
| 50 | 4.0 | 170 | 850 | 320 | 850×650×950 |
| 100 | 4.0 | 220 | 1400 | 550 | 950×700×1000 |
| 160 | 4.0 | 280 | 1900 | 750 | 1050×750×1050 |
| 200 | 4.0 | 340 | 2300 | 880 | 1100×800×1100 |
| 250 | 4.0 | 400 | 2700 | 1050 | 1150×800×1150 |
| 315 | 4.0 | 480 | 3300 | 1250 | 1200×850×1200 |
| 400 | 4.0 | 570 | 3900 | 1450 | 1250×900×1250 |
| 500 | 4.0 | 680 | 4800 | 1700 | 1300×950×1300 |
* The table displays standard SCB13 dry-type technology platform parameters. Dimensions and weights are for reference and may vary based on specific enclosures or cooling fan configurations.
FAQ
The 11kv dry type transformer is widely used in commercial buildings, data centers and subway power supply systems. It has no flammable oil and can be installed indoors without independent fire protection rooms for safe power conversion.
Our 11kv dry type transformer uses high-grade cast resin as insulation material. It boasts strong moisture resistance and stable insulation performance, greatly extending the service life of the 11kv dry type transformer in humid environments.
The 11kv dry type transformer is equipped with intelligent temperature control fans. When the coil temperature rises, cooling devices start automatically to ensure the 11kv dry type transformer runs stably under long-time high-load operation.
The 11kv dry type transformer eliminates risks of oil leakage and explosion. Without combustible medium, the 11kv dry type transformer meets strict fire safety standards for dense population and indoor power distribution stations.
Our factory supports customized capacity design for all 11kv dry type transformer models. We can adjust coil parameters and housing sizes of the 11kv dry type transformer to match clients’ specific grid power distribution demands.
Whatsapp: +86-13961294414
E-mail: junqiu.wang@czguanghui.cn
jocelyn.duan@czguanghui.cn
ADD: No. 1, Yulong Middle Road, Xuejia Town, Xinbei District, Changzhou City, China
Mobile: 0086-15380068868
