400kVA Three Phase Dry-Type Step-Up Isolation Transformer for Industrial Voltage Conversion
The 400kVA three phase dry-type step-up isolation transformer is a high-capacity industrial power transformer specifically engineered for voltage step-up, electrical isolation, and reliable three phase power conversion in heavy-duty industrial and infrastructure applications. Designed to support three phase industrial power systems, this dry-type isolation transformer commonly converts 220V primary voltage to 380V secondary voltage, while also supporting a wide range of other standard industrial voltages to meet global power requirements.
As a 400 kVA isolation transformer, this unit is suitable for large-scale industrial loads, centralized power distribution systems, and projects requiring stable high-capacity voltage conversion. The dry-type, oil-free design ensures safe operation, low maintenance, and compliance with strict environmental and fire safety standards, making it ideal for indoor installations and mission-critical industrial environments.
Technical Specifications – 400kVA Dry-Type Step-Up Isolation Transformer
| Item | Specification |
|---|---|
| Power Rating | 400 kVA |
| Transformer Type | Dry-Type Isolation Transformer |
| Phase | Three Phase |
| Primary Voltage (Standard) | 220V |
| Secondary Voltage (Standard) | 380V |
| Optional Primary Voltages | 200V, 208V, 220V, 230V |
| Optional Secondary Voltages | 380V, 400V, 415V, 440V |
| Voltage Function | Step-Up / Voltage Conversion |
| Frequency | 50 / 60 Hz |
| Connection Type | Delta–Wye (common), Wye–Wye or Delta–Delta optional |
| Cooling Method | Air Natural (AN), oil-free |
| Insulation Class | Class F / Class H |
| Temperature Rise | 80K / 100K |
| Enclosure | NEMA 1 indoor (NEMA 3R optional) |
| Standards | ANSI, IEEE, IEC |
| Certifications | UL, cUL, CSA, CE, SGS (optional) |
| Customization | OEM / ODM / Private Label available |
Electrical Isolation & Step-Up Voltage Conversion Principle
The 400kVA three phase dry-type step-up isolation transformer operates on electromagnetic induction, utilizing separate primary and secondary windings to provide complete galvanic isolation between the input and output circuits. This isolation protects downstream equipment from electrical noise, transient overvoltage, grounding issues, and harmonic distortion commonly found in industrial power networks.
In typical step-up transformer applications, the unit converts 220V three phase input power to 380V output voltage, enabling compatibility between different regional or equipment voltage standards. In addition to standard step-up configurations, the transformer can be customized to support alternative voltage combinations such as 208V to 400V or 220V to 415V, offering flexible solutions for international projects and mixed-voltage systems.
Materials, Core Design & Heavy-Duty Construction
The 400kVA dry-type three phase isolation transformer is manufactured using high-grade laminated silicon steel cores designed to minimize no-load loss, reduce vibration, and improve overall energy efficiency. Precision-wound copper or aluminum conductors are used for the windings, ensuring excellent current-carrying capability, thermal stability, and mechanical strength under continuous high-load operation.
Advanced Class F or Class H insulation systems provide reliable thermal endurance for long-term industrial duty. Compared with oil-filled transformers, the dry-type construction eliminates the risk of oil leakage, simplifies installation, and reduces ongoing maintenance, making it a preferred solution for large industrial facilities and infrastructure projects.
Performance Advantages for High-Capacity Industrial Power Systems
The 400kVA three phase dry-type step-up isolation transformer delivers consistent performance and multiple operational advantages:
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Reliable high-capacity three phase power conversion
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Effective electrical isolation for industrial equipment protection
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Stable and efficient step-up voltage transformation
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Compatibility with multiple industrial voltage standards
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Reduced electrical noise and improved power quality
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Long service life under continuous heavy-duty operation
These advantages make the transformer suitable as a step-up isolation transformer, industrial voltage conversion transformer, or high-capacity dry-type power transformer in demanding environments.
Typical Applications & Industry Use
This 400kVA industrial dry-type step-up isolation transformer is widely applied in:
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Industrial manufacturing plants and processing facilities
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Centralized power distribution rooms and substations
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Large-scale automation and motor control systems
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Infrastructure and utility support systems
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Commercial and industrial buildings with mixed voltage requirements
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Export-oriented factories adapting equipment to local grid voltages
Its flexible voltage conversion capability makes it ideal for international projects where 220V power sources must be converted to 380V industrial systems.
Compliance with Global Standards & Regional Requirements
The 400kVA three phase dry-type isolation transformer is designed and manufactured in compliance with ANSI, IEEE, and IEC standards, supporting installations across North America, Europe, the Middle East, Southeast Asia, South America, and Australia.
Typical export destinations include the United States, Canada, Brazil, Argentina, Germany, France, Russia, Saudi Arabia, the United Arab Emirates, Australia, Indonesia, Malaysia, and the Philippines, where different grid standards and voltage requirements apply. Custom configurations are available to meet local regulations and project specifications.
Project Case Study – Large Industrial Voltage Conversion System
400kVA Dry-Type Step-Up Isolation Transformer for Manufacturing Plant
A 400kVA three phase dry-type step-up isolation transformer was supplied for a large industrial manufacturing facility requiring 220V to 380V voltage conversion to support imported production equipment and centralized power distribution.
The customer selected a dry-type isolation transformer due to strict indoor safety requirements and the need for continuous operation under high load. The transformer was configured with a Delta–Wye connection to ensure stable output voltage and effective grounding.
After installation and commissioning, the system delivered stable 380V output, improved power quality, and reliable isolation, supporting uninterrupted production and long-term operational stability.
Manufacturing Capability, Supply & Global Sales
This 400kVA dry-type step-up isolation transformer is produced by a China-leading manufacturer, supplier, wholesale exporter, and factory specializing in industrial power equipment. Strict quality control is applied throughout core assembly, winding, insulation, and final testing to ensure consistent performance and reliability.
With strong production capacity and export experience, the transformer is supplied globally for industrial projects, EPC contractors, distributors, and infrastructure developments. Both standard models and fully customized solutions are available.
OEM, ODM & Custom Branding Support
OEM, ODM, and private label services are available for the 400kVA three phase dry-type isolation transformer, including custom voltage configurations, enclosure options, insulation classes, labeling, and documentation. This flexibility supports global partners seeking tailored solutions for different markets and applications.
Reliable Step-Up Power Solution for Global Industrial Projects
With its high power rating, flexible voltage conversion options, and robust dry-type construction, the 400kVA three phase dry-type step-up isolation transformer provides a safe, efficient, and reliable solution for industrial voltage conversion worldwide. It is an ideal choice for applications requiring 220V to 380V step-up transformation, electrical isolation, and long-term operational stability in global industrial power systems.
Ready to Source Your Dry-Type Isolation Transformer?
Whether you are upgrading an existing power system or developing a new industrial project, PowerNex provides reliable and scalable dry-type isolation transformer solutions for global customers. Our product range covers low, medium, and high power ratings, including 10kVA, 30kVA, 45kVA, 75kVA, 100kVA, 200kVA, 300kVA, 400kVA, 500kVA and up to 5000kVA, supporting both single-phase and three-phase configurations.
We supply step-up, step-down, and isolation transformers with a wide selection of primary and secondary voltages, such as 220V, 380V, 400V, 415V, 440V, 480V, 600V, and other customized voltage combinations to meet regional grid standards and project-specific requirements. Multiple connection types, insulation classes, enclosure options, and certifications are available to support industrial, commercial, and infrastructure applications worldwide.
As a China-leading dry-type transformer manufacturer, supplier, factory, and wholesale exporter, PowerNex offers OEM, ODM, and private label services, fast production lead times, and stable quality for long-term cooperation. Whether you need a standard model or a fully customized dry-type isolation transformer, our engineering team is ready to support your project from design to delivery.
Contact PowerNex today to request technical consultation, drawings, or a competitive quotation—and power your industrial systems with confidence using our proven dry-type isolation transformer solutions.
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