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The three-phase cast-resin dry-type transformer is the foundational power distribution core for modern substations. Strictly conforming to IEC and national standards, it utilizes vacuum-cast epoxy resin and an efficient natural/forced air cooling system. It seamlessly merges the oil-free, eco-friendly, and fire-resistant benefits of dry-type systems with the immense stability required for three-phase centralized distribution. It is highly suitable for medium-small industrial parks, commercial complexes, municipal public utilities, and renewable energy integrations, operating flawlessly in standard and customized harsh environments.
Core Parameters:
• Energy Efficiency: Tier 2 Efficiency (SCB10 Series, GB 20052-2024 NX2).
• Structure: High-Strength Resin Cast + Foil LV Windings (Robust short-circuit resistance).
• Cooling Mode: AN / AF Dual Mode (Forced air safely boosts capacity during peak loads).
Product Features
Engineered perfectly for three-phase networks, utilizing a Dyn11 vector group to excel at handling unbalanced loads and suppressing zero-sequence harmonics across the grid.
100% oil-free design using premium flame-retardant epoxy resin. It acts as a self-extinguishing barrier, eliminating all explosion hazards in densely populated indoor spaces.
The low-voltage coils are constructed from imported copper foil, massively enhancing the mechanical strength and the transformer's ability to endure severe short-circuit impacts.
Adheres to the SCB10 Tier 2 efficiency standards (NX2). It strikes the perfect balance between initial capital investment and long-term energy savings for standard industrial loads.
Standardly relies on Natural Air (AN) cooling. Activating the optional Forced Air (AF) cooling can safely boost the operational capacity by 1.2x during peak demand periods.
With no insulating oil to monitor or replace, operational maintenance is reduced to simple visual checks and occasional fan dust wiping, ideal for semi-unattended substations.
Key Specifications (Three-Phase SCB10 Series)
| Parameter | Typical Value | Description |
| Energy Efficiency | Tier 2 (GB 20052-2024 NX2) | The standard for budget-conscious, highly stable distribution grids. |
| Rated Voltage | HV: 10kV / 20kV LV: 0.4kV | Highly precise three-phase distribution output to directly power commercial and industrial hubs. |
| Vector Group | Dyn11 | Standard connection ensuring robust handling of severe unbalanced electrical loads. |
| No-Load Loss | Approx. 0.18kW ~ 4.3kW | Reliably low idle energy waste through high-grade silicon steel construction. |
| Load Loss (120℃) | Approx. 1.2kW ~ 24.0kW | Stable energy conversion efficiency under continuous distribution loads. |
| Environmental Limits | Customizable (Alt ≤4000m) | Manufacturer direct customization ensures safe operation even in extreme high-altitude areas. |
Full Series Technical Reference (SCB10 Three-Phase Platform: 30kVA ~ 3150kVA)
| Capacity (kVA) | Impedance (%) | No-Load Loss (W) | Load Loss (W) | Total Weight (kg) | Dimensions W×D×H (mm) |
| 30 | 4.0 | 180 | 600 | 250 | 800×600×900 |
| 50 | 4.0 | 240 | 870 | 320 | 850×650×950 |
| 100 | 4.0 | 380 | 1500 | 550 | 950×700×1000 |
| 160 | 4.0 | 540 | 2000 | 750 | 1050×750×1050 |
| 200 | 4.0 | 620 | 2400 | 880 | 1100×800×1100 |
| 250 | 4.0 | 720 | 2800 | 1050 | 1150×800×1150 |
| 315 | 4.0 | 880 | 3400 | 1250 | 1200×850×1200 |
| 400 | 4.0 | 980 | 4100 | 1450 | 1250×900×1250 |
| 500 | 4.0 | 1160 | 4900 | 1700 | 1300×950×1300 |
| 630 | 4.5 | 1340 | 6200 | 1950 | 1350×1000×1350 |
| 800 | 4.5 | 1520 | 7500 | 2300 | 1400×1000×1400 |
| 1000 | 4.5 | 1770 | 8800 | 2700 | 1450×1050×1450 |
| 1250 | 4.5 | 2090 | 10800 | 3200 | 1550×1100×1550 |
| 1600 | 4.5 | 2450 | 13200 | 3800 | 1650×1150×1650 |
| 2000 | 4.5 | 3000 | 16000 | 4500 | 1750×1250×1800 |
| 2500 | 4.5 | 3600 | 19500 | 5300 | 1850×1300×1900 |
| 3150 | 4.5 | 4300 | 24000 | 6500 | 2000×1400×2100 |
* The table above displays the complete parameter range for the standard SCB10 three-phase platform. Dimensions and weights serve as a precise reference for electrical room space planning. Protective enclosures (IP20/IP40) will add slight variations.
FAQ
The Dyn11 vector group (Delta primary, Star secondary with neutral) is the universal standard for modern three-phase distribution networks, offering several critical advantages over the older Yyn0 configuration:
1) High Tolerance for Unbalanced Loads: In commercial and residential buildings, single-phase loads (lighting, appliances) are rarely perfectly balanced across the three phases. The Delta (D) primary winding allows zero-sequence currents to circulate within the closed loop, preventing them from distorting the primary voltage. This ensures the transformer delivers highly stable voltage even when loads are severely imbalanced.
2) Harmonics Suppression: Modern grids are filled with non-linear loads (LEDs, computers, EV chargers) that generate 3rd harmonic currents. The Dyn11 delta winding traps and suppresses these 3rd harmonics, preventing them from polluting the high-voltage grid and reducing overheating in the transformer core.
3) Enhanced Safety & Grounding: The Star (y) secondary provides a solid neutral point, enabling standard 3-phase 4-wire (or 5-wire TN-S) distribution. This ensures safe 220V single-phase tapping and robust ground-fault protection for end-users.
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
