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The cast-resin dry-type auto-transformer (ZSCB Series) represents a highly efficient, space-saving engineering marvel for centralized distribution. Unlike standard isolation transformers, it shares a common winding for both high and low voltage, enabling direct energy transfer. This architectural advantage slashes no-load and load losses by 30%~50%, drastically reduces the physical footprint, and lowers capital costs. Encapsulated in flame-retardant solid resin, it is the premier choice for large substations, industrial power grids, commercial high-rises, and renewable energy plants where electrical isolation is not strictly required.
Core Parameters:
• Energy Efficiency: Surpasses standard Tier 2 ratings (Losses dropped by 30%~50%).
• Structure: Shared Auto-Winding + High-Strength Resin Cast (Compact & Lightweight).
• Cooling Mode: Dual AN/AF (Forced air safely accommodates peak load surges).
Product Features
Because the high and low voltages share a common winding, electrical and magnetic losses drop by an astonishing 30%~50% compared to dual-winding models, ensuring ultra-high energy efficiency.
The shared copper structure requires significantly less core and winding material. This creates an extremely compact and lightweight unit, drastically reducing the required installation footprint.
Fully oil-free enhanced resin-cast operation. Inherently flame retardant, it eradicates explosion hazards, allowing deep integration into populated commercial and industrial zones.
Using less copper and silicon steel makes the auto-transformer inherently more cost-effective to manufacture, delivering massive capacities (up to 3150kVA) at highly competitive capital costs.
Equipped with a dual-mode AN/AF cooling system. Activating the Forced Air (AF) fans safely escalates the operational capacity during intense industrial peak loads without risking heat damage.
The airtight resin structure shields components from dust and moisture. With zero oil testing needed, a simple semi-annual visual check keeps long-term O&M costs at absolute rock bottom.
Key Specifications (ZSCB Auto-Transformer)
| Parameter | Typical Value | Description |
| Rated Capacity | 100kVA ~ 3150kVA | Massive capacity tailored for large interconnected grids and industrial hubs. |
| Rated Voltage | HV: 10kV / 35kV LV: 0.4kV | Highly precise distribution output for large-scale energy transmission. |
| Loss Metrics | Reduced by 30%~50% | Due to the shared winding design, No-Load and Load losses are exceptionally lower than standard isolation units. |
| Impedance | Customized (Lower) | Inherently lower impedance than dual-winding types, enhancing voltage stiffness. |
| Insulation Class | Class F (155℃) / Class H (180℃) | Solid resin casting ensures premium heat resistance under continuous heavy loads. |
| Cooling Method | AN / AF (Dual Mode) | Natural air handles standard loads; Forced air safely boosts capacity by an extra 30%. |
Detailed Description
The cast-resin dry-type auto-transformer (ZSCB Series) is an engineering masterpiece for centralized power grids. Distinct from conventional dual-winding isolation transformers, an auto-transformer employs a single, continuous winding where a portion acts as both the primary and secondary circuit. This direct electrical connection enables an incredible level of efficiency—drastically dropping copper and iron losses by 30% to 50%, while making the overall unit significantly lighter and more compact.
Encased in a high-strength, vacuum-poured epoxy resin, it retains all the crucial benefits of a dry-type transformer: it is 100% oil-free, highly flame-retardant, and requires zero routine maintenance. Engineered for capacities scaling up to 3150kVA, it operates flawlessly in environments from -25℃ to 40℃. It is the ultimate strategic choice for large substations, industrial plant upgrades, and commercial high-rises where electrical isolation is not mandatory, but maximizing space, efficiency, and ROI is critical.
Full Series Technical Parameters (ZSCB Platform)
| Capacity (kVA) | Impedance (%) | No-Load Loss (W) | Load Loss (W) | Total Weight (kg) | Dimensions W×D×H (mm) |
| 100 | Custom | ≤ 150 | ≤ 900 | 420 | 900×650×950 |
| 250 | Custom | ≤ 280 | ≤ 1800 | 850 | 1100×750×1100 |
| 500 | Custom | ≤ 450 | ≤ 3200 | 1350 | 1250×850×1250 |
| 800 | Custom | ≤ 650 | ≤ 4800 | 1850 | 1350×950×1350 |
| 1250 | Custom | ≤ 900 | ≤ 7000 | 2600 | 1500×1050×1500 |
| 1600 | Custom | ≤ 1100 | ≤ 8600 | 3100 | 1600×1100×1600 |
| 2000 | Custom | ≤ 1350 | ≤ 10500 | 3700 | 1700×1200×1750 |
| 2500 | Custom | ≤ 1650 | ≤ 12800 | 4400 | 1800×1250×1850 |
| 3150 | Custom | ≤ 2050 | ≤ 15500 | 5400 | 1950×1350×2050 |
* The table above illustrates the ZSCB Auto-Transformer platform. Due to the shared winding architecture, dimensions, weights, and losses are notably smaller and lower than those of standard SCB13 dual-winding isolation transformers of the same capacity.
FAQ
The core difference lies in how the high voltage and low voltage coils interact:
1) Structural Difference: A standard isolation transformer (like the SCB series) has physically separate primary and secondary windings linked only by a magnetic field. An Auto-Transformer (ZSCB series) uses a single continuous coil acting as both primary and secondary. They are directly connected both magnetically and electrically.
2) The Massive Advantages: Because they share copper coils and require a smaller iron core, Auto-Transformers are incredibly efficient. Their no-load and load losses are 30%~50% lower, they generate less heat, and they take up much less physical space and weight compared to an isolation transformer of the exact same capacity.
3) When to Use It: You should use an Auto-Transformer when your system does not require strict electrical isolation between the high and low voltage networks (e.g., general grid step-down, large motor starting, or interconnecting networks with similar voltage ratios like 35kV to 10kV). If complete galvanic isolation is mandated for safety or interference reduction (e.g., medical grids or marine systems), a standard dual-winding transformer must be used instead.
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