The Usune 11kV 1000kVA dry type transformer is an energy-efficient, oil-free power transformer independently developed and manufactured by Zhejiang Usune Electric. Unlike traditional oil-immersed transformers, this unit employs an air-insulated and air-cooled design, fundamentally eliminating safety hazards such as oil leaks, fires, and explosions. It operates without generating pollutants or harmful gas emissions, making it highly suitable for power supply scenarios involving confined spaces, high population density, and strict environmental standards.
Manufactured on standardized production lines, the product strictly adheres to national electric power industry standards and has undergone rigorous performance testing. Characterized by stable operation, strong environmental adaptability, and low maintenance costs, it serves as a core component of intelligent power distribution systems across civil, commercial, industrial, and rail transit sectors.
The unit utilizes high-temperature resistant insulation materials and contains no insulating oil, completely eliminating safety incidents such as oil leaks, fires, or explosions. Capable of stable, long-term operation under high loads, it offers a high level of safety, making it ideal for environments with stringent electrical safety requirements, such as hospitals, schools, and subways.
The unit operates without oil contamination or harmful gas emissions, complying with green, low-carbon power supply standards. It allows for direct indoor installation without the need for auxiliary facilities like dedicated oil pits or fire-resistant partitions, effectively reducing project construction and renovation costs.
Optimized core and winding designs significantly reduce operating noise, meeting requirements for quiet indoor power supply. Additionally, the unit exhibits extremely low partial discharge levels, effectively preventing insulation aging and performance degradation, thereby ensuring long-term stable operation and extending the equipment's service life.
Utilizing high-quality silicon steel sheets combined with optimized winding processes, the equipment significantly reduces no-load and load losses. This effectively lowers long-term energy consumption, helping users save energy and reduce operating costs.
Featuring an air-insulated and air-cooled structural design, the equipment eliminates the need for insulating oil or complex maintenance procedures; only simple, periodic visual inspections are required. It is perfectly suited for unattended power distribution scenarios, drastically reducing long-term operation and maintenance costs.
The equipment undergoes specialized processing for moisture resistance, dust resistance, and temperature tolerance, making it suitable for challenging environments such as high-humidity, high-altitude, and dusty locations. It is widely applicable to various indoor power supply scenarios, including industrial workshops, underground utility tunnels, subways, hospitals, and campuses.
The product features a compact structure, small footprint, and lightweight design, occupying significantly less space than traditional oil-immersed transformers. It offers convenient transportation and simple on-site installation, effectively shortening project construction and grid-connection timelines.
The Usune 11kV 1000kVA dry type transformer operates based on the principle of electromagnetic induction. Unlike traditional oil-immersed transformers, it utilizes air as the sole medium for both insulation and heat dissipation, requiring no insulating oil.
When alternating current flows through the primary winding, it generates an alternating magnetic flux in the iron core, inducing electromotive force in the secondary winding via electromagnetic induction. By precisely configuring the turn ratio between the primary and secondary windings, the unit achieves voltage conversion from 11kV (high voltage) to 0.4kV (low voltage), ensuring stable power transmission.
Heat generated during operation is dissipated through natural or forced air convection. By relying on air insulation and air cooling, the unit performs voltage transformation and power transmission safely, efficiently, and stably.
| Item | Technical Parameter |
| Rated Capacity | 30～2500 kVA (Standard: 1000kVA) |
| HV Rated Voltage | 10kV / 10.5kV |
| LV Rated Voltage | 0.4kV |
| Rated Frequency | 50/60Hz |
| Vector Group | Dyn11 |
| Impedance Voltage | 4%～6% (Standard: 6%) |
| Ambient Temperature | -20℃～+40℃ |
| Altitude | ≤1000m |
| Relative Humidity | ≤95% (No Condensation) |
| Installation Site | Indoor Use Only |
Case Study: Power Distribution Retrofit Project at Hongshan Culture Site Park
Liaoning Hongshan Culture Site Park is a national-level cultural and tourism attraction that maintains extremely high standards for electrical safety and environmental protection. The scenic area's original aging transformers posed safety risks—such as insufficient capacity, high energy consumption, and potential oil leaks or fires—and could no longer meet the requirements for a stable, safe, and compliant power supply.
In 2023, the scenic area launched a power system upgrade, replacing the old oil-immersed equipment with Usune 11kV 1000kVA dry type transformers. Since commissioning, the units have operated with zero faults, zero pollution, and low noise levels. This upgrade has completely eliminated electrical safety hazards and effectively reduced energy consumption, providing a stable and reliable power supply for scenic operations and cultural relic preservation—earning high praise from the client.
This dry-type transformer features an air-insulated, air-cooled design; it requires no insulating oil replacement or servicing and involves no complex maintenance procedures. Routine operations are limited to simple visual inspections, significantly lowering long-term O&M costs and making it ideal for unmanned distribution rooms.
Yes, it can. The equipment undergoes professional moisture-proof, dust-proof, and anti-corrosion treatments, allowing it to adapt to complex operating conditions—including humidity up to 95% (non-condensing), high dust levels, and significant temperature fluctuations. It operates stably in industrial workshops, underground distribution rooms, and tunnels without performance degradation.
Compared to oil-immersed transformers, the core advantages of Usune dry-type transformers include being oil-free and pollution-free, fire- and explosion-proof, energy-efficient with low noise, and maintenance-free. They do not require auxiliary fire-protection or oil-containment facilities, offering superior safety and simplified O&M. These products are designed for high-standard indoor environments such as hospitals, schools, subways, and commercial buildings, whereas oil-immersed transformers are better suited for open outdoor areas with less stringent environmental and safety requirements.
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