The Usune 630kVA epoxy resin dry type transformer is an oil-free distribution transformer designed for indoor power supply scenarios requiring high safety standards. It features high- and low-voltage windings encapsulated in high-temperature-resistant epoxy resin and relies on air for insulation and heat dissipation. This design fundamentally eliminates safety hazards associated with oil-immersed transformers—such as oil leaks, fires, and explosions—and ensures zero emission of harmful gases during operation.
Suitable for complex indoor environments characterized by high humidity, dust, or high altitudes, this equipment is widely used in hospitals, schools, subway stations, commercial complexes, and industrial plants. The 630kVA rating is a mainstream specification for small-to-medium power applications, balancing power supply capacity, installation space requirements, and energy efficiency; it is a preferred choice for both new installations and the retrofitting of indoor power distribution systems.
It utilizes Class F high-temperature-resistant epoxy resin insulation materials and contains no insulating oil. Even under extreme conditions such as overloads or short circuits, the unit will not catch fire, explode, or leak. Its high safety rating fully complies with stringent fire safety regulations for public buildings and underground spaces.
Operation involves no oil contamination or release of toxic/harmful gases. It requires no dedicated oil pits or fire-isolation barriers and can be installed directly indoors, effectively reducing civil engineering costs and aligning with industry trends toward low-carbon, environmentally friendly development.
Optimized core and foil winding structures significantly reduce magnetic vibration noise and internal partial discharge levels. This prevents insulation aging caused by electrical erosion, ensuring stable, continuous operation for over 20 years.
The iron core is constructed from high-grade grain-oriented silicon steel sheets, effectively reducing both no-load and load losses. For commercial and industrial projects involving long-term operation, this significantly lowers energy consumption and improves electrical energy utilization rates.
The 630kVA epoxy resin dry type transformer utilizes air insulation and a natural or forced-air cooling structure. It eliminates the need for periodic replacement, testing, or filtration of insulating oil; routine maintenance requires only simple dust removal and cleaning, drastically reducing labor and material costs for ongoing operations.
It operates stably in ambient temperatures ranging from -20°C to +40°C, at altitudes up to 1,000 meters, and in relative humidity of ≤95% (non-condensing). It is suitable for complex operating environments such as underground tunnels, dusty industrial plants, and high-humidity medical wards.
The unit is compact and lightweight, occupying minimal space in the power distribution room. Its modular, standardized structure facilitates transport and lifting, while the on-site assembly process is straightforward, requiring no complex supporting civil engineering infrastructure.
The Usune 630kVA epoxy resin dry type transformer operates based on the principle of electromagnetic induction. Featuring an oil-free insulation and heat dissipation structure—distinctly different from traditional oil-immersed transformers—its operation proceeds as follows:
1. Alternating current (AC) enters the primary winding, generating a continuously changing alternating magnetic flux within the laminated iron core;
2. The alternating magnetic flux penetrates the secondary winding, inducing an alternating electromotive force (EMF) in the secondary coil through electromagnetic induction;
3. Based on the turns ratio between the primary and secondary windings, the AC voltage is stepped up or down to achieve stable power transmission;
4. Using air as the medium for insulation and heat dissipation, the windings and core dissipate heat via natural convection or forced-air fans, safely executing voltage conversion and power transmission.
| Item | Technical Standard |
| Rated Capacity | 30～2500 kVA (630 kVA standard model) |
| High Voltage Rated Voltage | 10kV / 10.5kV |
| Low Voltage Rated Voltage | 0.4kV |
| Rated Frequency | 50/60Hz dual frequency |
| Vector Group | Dyn11 |
| Impedance Voltage | 4%～6%, standard configuration 6% |
| Item | Technical Standard |
| Ambient Temperature Range | -20℃～+40℃ |
| Maximum Applicable Altitude | ≤1000m |
| Relative Humidity | ≤95%, no condensation allowed |
| Standard Installation Location | Indoor space |
A Grade-A tertiary hospital in Zhejiang procured two Usune 630kVA epoxy resin dry type transformers to supply power to patient wards and precision medical equipment. Leveraging the product's oil-free, fire-resistant, low-noise, and low-partial-discharge characteristics, the solution eliminates fire hazards in medical facilities and prevents noise from disturbing patients, while ensuring a stable power supply for precision equipment such as CT and MRI scanners. The equipment has operated smoothly and continuously for three years without requiring any downtime for maintenance.
A subway line in a Chinese city deployed four Usune 630kVA dry-type transformers in the power distribution room of an underground station. Addressing the challenges of underground spaces—such as high humidity, poor ventilation, strict fire safety requirements, and limited installation space—the product is perfectly suited to tunnel operational standards. Its advantages include moisture and dust resistance, explosion-proof and flame-retardant capabilities, and a compact footprint, ensuring a safe power supply for the subway's auxiliary systems.
A1: First, it is completely oil-free, eliminating risks of fire, explosion, and oil leakage; it requires no oil pits or fire-isolation facilities, making it suitable for various enclosed indoor environments. Second, it produces zero harmful emissions during operation and requires no oil changes or related maintenance, significantly reducing long-term O&M costs. Third, its low-noise and low-partial-discharge performance protects sensitive medical and automated precision equipment from voltage fluctuation interference, making it a safe, preferred choice for high-traffic areas like schools, hospitals, and subways.
A2: Yes. Usune utilizes an optimized integral epoxy resin encapsulation process that fully encases the windings, effectively blocking the ingress of moisture and dust. The product operates stably in dusty indoor environments with humidity levels up to 95% (non-condensing). For environments with extreme dust levels, a custom protective enclosure can be added to enhance environmental resilience without compromising heat dissipation.
A3: The standard model supports dual-frequency operation (50/60Hz) and complies with grid specifications in most countries worldwide. It features 10kV/10.5kV high-voltage input and 0.4kV low-voltage output, utilizes a Dyn11 connection group, and has a standard impedance voltage of 6%. For requirements regarding specific voltage, impedance, or capacity parameters, our factory offers customized production tailored to the specific grid specifications of your project.
Brand Profile & ConclusionRooted in China and with over a decade of deep experience in the power equipment industry, Zhejiang Usune Electric Co., Ltd. is a trusted supplier of epoxy resin dry-type transformers. We implement comprehensive quality control throughout the entire process—from the inspection of incoming silicon steel raw materials to partial discharge testing of finished products—ensuring that all 630kVA series products meet international power industry standards. Leveraging factory-direct sales, customized designs, and one-stop after-sales technical support, we provide safe, energy-efficient, and durable indoor substation solutions for commercial, medical, transportation, and industrial projects worldwide.
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No. 298, Wei 17th Road, Yueqing Economic Development Zone, Yueqing, Wenzhou City, Zhejiang Province, China
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