The Usune 33kV 63kVA Dry Type Transformer is a core low-carbon, safety-focused power distribution product. It relies entirely on air insulation and air cooling, completely eliminating safety hazards associated with traditional oil-immersed transformers, such as oil leaks, fires, and explosions. Having undergone rigorous performance testing, the product delivers stable electrical performance and high adaptability; it requires no dedicated oil pits or fire-isolation facilities, effectively reducing construction and O&M costs for power distribution projects.
Leveraging the brand's standardized manufacturing system, this product precisely meets the power needs of small-to-medium-sized distribution scenarios and operates reliably in indoor, underground, high-humidity, and dusty environments. Recognized by global customers for its superior energy efficiency and safety, it serves as an excellent power solution for urban public facilities and industrial projects. As a premium power equipment supplier, Usune consistently empowers power distribution projects with high-quality products.
The 33kV 63kVA Dry Type Transformer utilizes specialized high-temperature resistant insulation materials and contains no insulating oil. This fundamentally eliminates risks such as oil leaks, fires, and explosions, ensuring exceptional operational safety—making it ideal for densely populated areas with strict fire safety requirements, such as hospitals and schools.
Featuring an air-insulated and air-cooled design, the unit generates no oil pollution or harmful gas emissions during operation. Indoor installation requires no oil drainage systems or fire-isolation infrastructure, resulting in lower environmental compliance costs and alignment with modern green, low-carbon power system standards.
By optimizing the core lamination process and winding structure, electromagnetic vibration and operating noise are effectively minimized. Precision manufacturing keeps partial discharge levels extremely low, preventing electrical aging and ensuring long-term, stable operation.
The unit utilizes high-permeability, premium-quality silicon steel sheets, significantly reducing both no-load and load losses. Energy consumption is far lower than that of traditional transformers of the same specification, lowering long-term electricity operating costs for users and achieving energy savings.
The 33kV 63kVA Dry Type Transformer eliminates the need for periodic maintenance tasks such as insulating oil replacement or oil quality testing. Its air-insulated, heat-dissipating structure is robust and durable, requiring only simple routine inspections; this drastically reduces labor costs and losses associated with equipment downtime.
Optimized structural design and materials allow the equipment to withstand harsh conditions—such as high humidity, high altitude, and dusty environments—and operate stably in indoor factories, underground subways, and confined spaces, demonstrating excellent environmental resilience.
The unit is compact, lightweight, and has a small footprint, facilitating transport and on-site lifting/installation. This effectively shortens construction timelines and makes it suitable for installation scenarios with limited space.
The Usune 33kV 63kVA Dry Type Transformer operates based on the principle of electromagnetic induction. When alternating current (AC) flows through the primary winding, an alternating magnetic flux is generated within the iron core. This flux penetrates the secondary winding, inducing an alternating electromotive force (EMF) in the secondary coil via electromagnetic induction.
The equipment achieves AC voltage transformation (step-up or step-down) and safe power transmission based on the turns ratio between the primary and secondary windings. Unlike oil-immersed transformers, this product uses air as the sole medium for insulation and heat dissipation between the windings and the core. It contains no insulating oil and relies on natural or forced air cooling to safely and stably perform voltage transformation and power transmission.
| Item | Technical parameter |
| Rated Capacity | 30～2500 kVA (63kVA conventional configuration) |
| HV Rated Voltage | 10kV / 10.5kV |
| LV Rated Voltage | 0.4kV |
| Rated Frequency | 50/60Hz |
| Vector Group | Dyn11 |
| Impedance Voltage | 4%～6% (conventional 6%) |
| Ambient Temperature | -20℃～+40℃ |
| Altitude | ≤1000m |
| Relative Humidity | ≤95% (no condensation) |
| Installation Site | Indoor |
In 2025, Usune supplied a 33kV 63kVA Dry Type Transformer for an auxiliary power distribution project for a subway system in a city in East China. The enclosed subway environment imposes extremely high requirements regarding fire safety, environmental protection, and noise reduction. The product’s oil-free design completely eliminates fire hazards, while its low-noise operation ensures no disruption to subway operations or the passenger environment. Since commissioning, the equipment has operated stably with zero faults, providing continuous power to auxiliary systems—such as lighting, ventilation, and monitoring—and ensuring the safe operation of subway infrastructure.
In 2024, a key secondary school in Zhejiang Province upgraded its indoor power distribution system, selecting the Usune 33kV 63kVA Dry Type Transformer as the core transformer unit. Given the high population density on campus and strict fire safety and environmental standards, the product’s zero-emission and maintenance-free characteristics effectively reduce the burden of operations and maintenance (O&M) as well as safety risks. Post-commissioning, the equipment has demonstrated low energy consumption and stable voltage output, effectively resolving issues with unstable power supply for teaching and campus life, while meeting long-term safety requirements for electricity usage.
The core difference lies in the insulation and heat dissipation media. This Usune product utilizes air for both insulation and heat dissipation, requiring no insulating oil; in contrast, traditional oil-immersed transformers rely on insulating oil for these functions. Consequently, this product offers distinct advantages—including fire and explosion resistance, environmental friendliness (pollution-free), and maintenance-free operation—making it ideal for indoor environments with high population density and stringent safety requirements.
The product is designed for indoor power distribution scenarios requiring high safety and environmental standards, covering enclosed or densely populated areas such as subways, hospitals, schools, commercial buildings, and indoor industrial plants. It is suitable for standard indoor environments as well as mildly harsh indoor conditions (e.g., high humidity or dust), though it is not intended for outdoor installation.
It requires neither oil changes nor complex maintenance. Traditional oil-immersed transformers require periodic testing, insulation oil replacement, and oil pit cleaning; in contrast, Usune dry-type transformers utilize an air-insulated design and eliminate the need for oil or other consumables. Routine maintenance is limited to periodic dust removal and operational checks, significantly reducing long-term O&M costs and the risk of equipment failure.
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