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The single-phase cast-resin dry-type transformer is a core transforming equipment specifically engineered for single-phase distribution systems. Utilizing solid insulation materials (epoxy resin, Nomex paper) and air as the cooling medium, its completely oil-free design ensures absolute safety and zero maintenance. Highly suited for 220V/380V civil and small-scale industrial applications, it perfectly adapts to lighting, machine tool control, precision instruments, and localized power supply needs, delivering robust and silent power transformation.
Core Parameters:
• Rated Voltage: HV 220V/380V matched with customized LV 12V/24V/110V/220V outputs.
• Structure: Solid Resin/Nomex Insulation + Pure Copper Winding (IP20/IP23).
• Capacity: Scalable from 0.5kVA up to 100kVA.
Product Features
Engineered with solid insulation materials like epoxy resin and Nomex paper, delivering a completely oil-free, highly flame-retardant structure. 100% eliminates any risk of explosion or oil leaks in indoor settings.
Built with high-permeability cold-rolled silicon steel and pure oxygen-free copper wire, significantly dropping no-load losses and maximizing power conversion for single-phase loads.
The precise core shell structure and VPI vacuum impregnation process tightly bond the components, drastically reducing operational vibration and electromagnetic noise to suit residential environments.
The concise single-phase design is remarkably compact. Housed in IP20 or IP23 enclosures, it perfectly fits inside small control cabinets, wall mounts, or tight industrial equipment panels.
Highly versatile. Designed primarily for 220V/380V inputs, offering an expansive range of precise low-voltage outputs (12V, 24V, 110V, 220V) to directly match specialized single-phase equipment.
Devoid of any liquid insulators or moving parts, the solid-state design requires virtually zero maintenance beyond occasional dusting, offering ultimate peace of mind.
Key Specifications (Single-Phase Series)
| Parameter | Typical Value | Description |
| Rated Capacity | 0.5kVA ~ 100kVA | Highly scalable to fit everything from small control circuits to substantial single-phase machinery. |
| Rated Voltage | HV: 220V / 380V LV: 12V / 24V / 110V / 220V | Perfectly aligns with civilian grids and low-voltage industrial control requirements. |
| Rated Current | Calculated by I = S / U | Directly dictates the selection of downstream fuses, breakers, and wiring. |
| Insulation Class | Class F (155℃) / Class H (180℃) | Superior thermal endurance ensuring stable operation without insulation breakdown. |
| Core Material | High-Permeability CRGO | Cold-rolled silicon steel minimizes iron losses and reduces acoustic hum. |
| Winding Material | Oxygen-Free Copper | Vacuum-cast or VPI impregnated for supreme electrical conductivity and short-circuit resistance. |
| Cooling Method | AN (Natural Air) | Standard natural cooling; some larger models (up to 100kVA) support AF to boost capacity by 20%~30%. |
| Protection Level | IP20 / IP23 | Standard indoor protection against solid objects and minor water ingress. |
Detailed Description
The single-phase cast-resin dry-type transformer represents the critical backbone of localized single-phase distribution and control systems. Structurally concise yet highly advanced, it consists of a single-phase core, high/low voltage windings, a robust solid insulation encapsulation, and protective casing. By abandoning insulating oil entirely, it utilizes air as its primary cooling medium and epoxy resin or Nomex paper as its dielectric barrier. This ensures the unit remains impeccably safe, highly flame-retardant, and totally immune to leakage—ideal for indoor applications.
With standard capacities ranging from a micro 0.5kVA up to 100kVA, and adaptable voltage ratios transforming 220V/380V down to precise operational voltages (such as 12V, 24V, 110V), it provides unwavering power to civilian circuits, localized industrial lighting, machine tool panels, and delicate laboratory instruments. Built with a high-grade CRGO silicon steel core and VPI-treated oxygen-free copper, it guarantees exceptionally low noise, high efficiency, and a maintenance-free lifespan.
FAQ
Single-phase dry-type transformers are distinct from large three-phase network transformers. Because of their highly customizable voltage ratios and compact sizes (0.5~100kVA), they are indispensable in specific scenarios:
1) Machine Tool Control: Used extensively inside CNC machines or industrial control panels to step down 380V to 110V/24V to safely power relays, contactors, and logic boards.
2) Localized Lighting & Safety Power: Stepping down voltage to 12V or 24V for safe, low-voltage lighting in damp environments, mining sites, or swimming pool facilities where human safety is paramount.
3) Precision Instrumentation: Providing isolated, clean, and stable single-phase power to sensitive medical equipment or laboratory testing tools, avoiding the interference of a shared three-phase system.
4) Civil & Commercial Branches: Acting as the final step-down node in older residential setups or small commercial outlets that primarily run on standard 220V appliances.
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E-mail: junqiu.wang@czguanghui.cn
jocelyn.duan@czguanghui.cn
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