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PowerNex® Dry Type Transformers Fire-Safe, Oil-Free Power Distribution for Modern Electrical Systems

Dry Type Transformers represent the industry standard for safe, reliable, and environmentally responsible power distribution. Designed without insulating oil, PowerNex® Dry Type Transformers eliminate fire hazards and leakage risks while delivering stable electrical performance for Low Voltage (LV) and Medium Voltage (MV) power systems.

As a professional Dry Type Transformer Manufacturer, Supplier, and Factory, PowerNex serves global markets including the United States, Canada, Europe, APAC, and the Middle East, delivering solutions that comply with IEC, IEEE, ANSI, and DOE Level 1 / Level 2 energy efficiency standards.

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I. Category Overview: The Foundation of Safe & Sustainable Power

Dry type transformers—also known as oil-free transformers, fire-safe transformers, cast resin transformers, and VPI transformers—are the preferred choice for applications where human safety, environmental protection, and long-term operational reliability are critical.

Unlike oil-immersed transformers, dry type transformers use air cooling and solid insulation systems, making them ideal for:

• Indoor substations

• High-occupancy buildings

• Underground facilities

• Mission-critical infrastructure

Typical applications include data centers, hospitals, commercial complexes, industrial plants, rail transit systems, renewable energy projects, and utility distribution networks.

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II. Why PowerNex Dry Type Transformers?

PowerNex engineers dry type transformers not merely as oil-free alternatives, but as high-performance power assets optimized for safety, efficiency, and lifecycle value.

Core Competitive Advantages

Ultimate Fire Safety

• F1 fire class rating

• Self-extinguishing insulation system

• Zero oil, zero explosion risk

Environmental Responsibility

• Oil-free, pollution-free operation

• RoHS-compliant materials

• Ideal for green buildings and urban infrastructure

Lowest Total Cost of Ownership (TCO)

• No oil testing, filtration, or replacement

• Minimal routine maintenance

• Reduced downtime and operating cost

Mechanical & Electrical Reliability

• High short-circuit withstand capability

• Stable voltage regulation under fluctuating loads

• Long insulation life even in harsh environments

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III. PowerNex Product Series & Technology Platforms

PowerNex offers two primary dry type transformer technologies, each optimized for specific operating conditions and project requirements.

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1. Cast Resin Dry Type Transformers (CRT)

Maximum Reliability for Harsh and Critical Environments

Cast Resin Transformers feature fully encapsulated windings, vacuum-cast in epoxy resin to create a solid, void-free insulation structure.

Technology Highlights

• Vacuum casting process with Partial Discharge < 10 pC

• Excellent resistance to humidity, dust, and pollution

• Superior mechanical strength during short-circuit events

Typical Ratings

• Power Range: 100 kVA – 10,000 kVA (10 MVA)

• Voltage Levels: 6.6 kV / 10 kV / 11 kV / 20 kV / 33 kV / 35 kV

Typical Applications

• Offshore platforms

• Chemical and petrochemical plants

• 33 kV utility substations

• Large data centers and mission-critical facilities

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2. VPI Dry Type Transformers

Efficient, Cost-Effective Distribution Solutions

VPI (Vacuum Pressure Impregnated) transformers use resin-impregnated open windings to achieve excellent heat dissipation and operational stability.

Technology Highlights

• Optimized air cooling performance

• Cost-effective for LV and medium-capacity MV systems

• Reliable continuous-duty operation

Typical Ratings

• Power Range: 5 kVA – 3000 kVA

• Voltage Levels: up to 11 kV

Typical Applications

• HVAC systems

• Factory distribution networks

• Commercial buildings

• Electrical system upgrades and retrofits

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IV. Capacity Range & Market-Focused Specifications

PowerNex maintains standardized designs and supports full customization for the most demanded ratings worldwide.

Popular Power Ratings

• 500 kVA Dry Type Transformer

• 1000 kVA Dry Type Transformer

• 1600 kVA / 2000 kVA

• 2500 kVA / 3000 kVA

• Up to 10 MVA

Common Voltage Configurations

• LV: 400 V / 480 V / 600 V

• MV: 10 kV / 11 kV / 13.8 kV / 20 kV / 33 kV / 35 kV

Cooling, Insulation & Protection

• Cooling: AN (Air Natural), AF (Air Forced, +25–40% overload)

• Insulation Class: F (155°C) / H (180°C)

• Enclosure: IP00 / IP20 / IP23 / IP54

• Protection: PT100 / PTC temperature monitoring, alarms, trip outputs

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V. Electrical Performance & Energy Efficiency

PowerNex dry type transformers are engineered to exceed modern efficiency and performance expectations:

• Low no-load loss using high-grade silicon steel or amorphous alloy cores

• Reduced load loss via copper or aluminum foil windings

• Optimized impedance for short-circuit stability

• Low noise design for urban and indoor environments

Our designs meet or exceed DOE Level 1 / Level 2, IEC EcoDesign, and other regional energy efficiency standards.

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VI. Global Manufacturing, Customization & Supply

As a trusted Dry Type Transformer Manufacturer, Factory, Supplier, and Exporter, PowerNex provides end-to-end support:

• Standard and fully customized transformer designs

• OEM / ODM manufacturing services

• Factory-direct pricing and bulk supply

• Full testing documentation and international certifications

• Export experience across USA, Canada, Germany, France, Australia, Southeast Asia, and the Middle East

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VII. Specify Your PowerNex Solution

Selecting the right dry type transformer is critical to system safety, efficiency, and long-term performance.

Whether you need:

• a 500 kVA VPI transformer for commercial distribution,

• a 1000 kVA dry type transformer for industrial use, or

• a 35 kV cast resin transformer for utility or renewable energy projects,

PowerNex® delivers safe, efficient, and future-ready power distribution solutions engineered for global standards and real-world applications.

📩 Contact our engineering team today to discuss your voltage, capacity, enclosure, and efficiency requirements and receive a factory-direct quotation.