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Non-Encapsulated VPI Dry-Type Distribution Transformers
50–3150kVA | Class H Insulation | Fully IEC / ANSI Compliant
Engineered with advanced Vacuum Pressure Impregnation (VPI) technology and an open-wound structure. Our non-encapsulated transformers deliver exceptional thermal performance, robust overload capacity, and an eco-friendly lifecycle, making them the standard choice for safe and reliable indoor power distribution.
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- Overview
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Key Technical Advantages
✅ Superior Heat Dissipation & Overload Capability Without a solid cast-resin shell, the open-wound structure allows cooling air to directly penetrate the coil's internal air ducts. This provides outstanding heat dissipation under natural convection (AN). When equipped with cooling fans (AF), it easily manages short-term load spikes typical in industrial production cycles.
✅ Maximum Fire Safety (Class H Insulation) Utilizing premium high-temperature insulation materials (such as Nomex aramid paper, rated for Class H 220°C). It is highly flame-retardant, self-extinguishing, and emits zero toxic gases or heavy smoke under extreme heat, satisfying the strictest fire codes for densely populated buildings.
✅ High Thermal Shock Resistance The VPI process ensures the insulating varnish penetrates every microscopic void. Once cured, this flexible varnish film expands and contracts with the coils, completely eliminating the risk of thermal stress cracking that solid cast-resin transformers may experience during sudden temperature drops or severe load fluctuations.
✅ 100% Recyclable & Eco-Friendly Aligned with modern ESG standards. Unlike cast-resin transformers that require costly and difficult disposal of solid epoxy blocks, the copper or aluminum conductors in VPI transformers can be easily separated from the insulation at the end of their service life, ensuring a nearly 100% material recovery rate.
✅ Technical Specifications
✅ (Note: Parameters can be adjusted based on your actual product line)
Parameter |
Specification |
Rated Capacity |
50 kVA – 3150 kVA (Higher capacities available upon request) |
Primary Voltage |
6kV, 10kV, 11kV, 20kV, 33kV, 35kV |
Secondary Voltage |
0.4kV, 0.415kV, 0.48kV, 0.69kV |
Insulation Class |
Class F (155°C) / Class H (220°C) |
Cooling Method |
AN (Air Natural) / AF (Air Forced) |
Enclosure IP Rating |
IP00 (Core & Coil only) / IP20, IP23, IP31 (With indoor metal enclosure) |
Winding Material |
High-Quality Oxygen-Free Copper / High-Purity Aluminum |
Standards Compliance |
IEC 60076-11, ANSI/IEEE C57.12.01, GB/T 1094.11 |
Primary Application Scenarios (Fact-Based)
Because VPI transformers excel in fire safety, overload capacity, and indoor thermal management, they are predominantly utilized in the following sectors:
✅ Commercial Buildings & Public Infrastructure: The strict fire safety and non-toxic emission requirements of densely populated areas make VPI transformers the first choice for high-rise office buildings, shopping malls, Tier III/IV hospitals, and airport terminals. They are typically installed in basement electrical rooms where clean, controlled ventilation is available.
✅ Data Centers & Telecommunications: Data centers require uninterrupted power and highly efficient thermal management. The low partial discharge (PD) and reliable continuous operation of VPI transformers align perfectly with the stringent uptime demands of modern server farms and telecom hubs.
✅ Industrial Manufacturing & Processing: In heavy industries such as automotive manufacturing, steel mills, paper mills, and textile plants, equipment loads can fluctuate wildly. The VPI transformer's superior ability to handle transient overloads (without the thermal cracking risks of resin-cast units) ensures stable power delivery for motors, drives, and heavy machinery.
✅ Urban Transit Systems: Widely deployed in subway stations and railway transit hubs where underground fire safety, compact footprint, and low maintenance are critical priorities.
