This 11kv To 440v 600 630kVA Three-Phase Distribution Transformer represents a core, eco-friendly power distribution solution from Usune. It overcomes the technical limitations of traditional oil-immersed transformers by eliminating the insulating oil system in favor of air-cooled insulation, thereby achieving significant upgrades in both safety and environmental performance. Designed primarily for high-to-low voltage conversion, it stably transforms 11kV high-voltage power into 440V low-voltage power. Available in common 600kVA and 630kVA specifications, it meets the power supply requirements of distribution systems of various scales.
Leveraging years of experience in power equipment R&D and manufacturing, Usune has optimized the winding structure and heat dissipation system, resulting in a compact, impact-resistant, and stable unit. It completely eliminates failures caused by oil aging or leakage associated with traditional equipment, ensuring reliable, continuous operation in complex indoor environments. It is a preferred choice for high-end civil and industrial power distribution projects both domestically and internationally.
The 11kv To 440v 600 630kVA Three-Phase Distribution Transformer contains no insulating oil, fundamentally eliminating safety hazards such as oil leaks, fires, and explosions. Constructed with high-temperature-resistant insulating materials, it withstands drastic temperature fluctuations and short-circuit stresses. It produces no open flames or hazardous gases during faults, ensuring inherently safe operation—making it particularly suitable for densely populated areas with strict fire safety requirements, such as hospitals, schools, and subways.
Through optimized electromagnetic design and high-precision winding techniques, partial discharge and no-load losses are effectively minimized, resulting in low energy consumption and high power transmission efficiency. Featuring an integrated vibration-damping and noise-reducing structure, the unit operates with extremely low noise levels, avoiding noise pollution in surrounding work and living environments and meeting environmental standards for urban public buildings and industrial parks.
Constructed from eco-friendly, non-polluting materials, the unit generates no contaminants—such as oily residue or waste oil—during operation or at the end of its service life. With no oil-based systems, it eliminates the need for routine oil checks, changes, or maintenance, allowing for long-term, maintenance-free operation and significantly reducing labor and material costs for the user.
The 11kv To 440v 600 630kVA Three-Phase Distribution Transformer excels in indoor environments. It operates stably in complex conditions—such as high humidity or dust—and is not constrained by terrain or ventilation limitations. It is widely used in commercial complexes, medical facilities, campuses, industrial plants, urban subways, and other indoor fixed power distribution settings.
For an indoor power distribution upgrade project on a subway line in a Chinese city, 32 Usune 630kVA dry-type distribution transformers were procured in bulk. Subway environments are enclosed and densely populated, placing extremely high demands on equipment fire safety. The oil-free design completely eliminates fire hazards, while low-noise operation ensures no disruption to subway services or the passenger experience. The equipment has operated continuously for two years without failure, maintaining stable voltage conversion and normal partial discharge levels, perfectly meeting the need for long-term, stable power supply in the subway's indoor electrical system.
A Grade-A tertiary hospital in East China upgraded its power distribution system by installing 18 Usune 600kVA dry-type transformers. Medical equipment requires rigorous power stability, whereas traditional oil-immersed equipment poses safety risks and entails complex maintenance. Thanks to their maintenance-free nature and low partial discharge characteristics, Usune transformers ensure a continuous, stable power supply for operating rooms, diagnostic equipment, and patient wards. Their eco-friendly, non-polluting design also meets the cleanliness standards required for medical environments, ensuring efficient and stable operation since commissioning.
A precision machinery manufacturing plant in Zhejiang utilized 25 units of Usune 600/630kVA dry-type transformers for its indoor workshop power distribution system. Precision manufacturing workshops demand exceptionally high standards for power quality and environmental conditions; the transformers' low-loss and low-noise characteristics effectively reduce production energy consumption and workshop noise. Their resistance to interference and stable voltage output ensure the normal operation of precision equipment. Additionally, the maintenance-free design significantly reduces the electrical operations and maintenance workload, enhancing the plant's overall operational efficiency.
Rated Capacity: 600kVA / 630kVA
Input Voltage: 11kV
Output Voltage: 440V
Number of Phases: Three-phase
Cooling Method: Air natural cooling (AN)
Insulation Medium: Eco-friendly air insulation
Partial Discharge: Low partial discharge design; complies with high-precision industry standards
Operating Noise: Low-noise operation; suitable for quiet indoor environments
Service Life: ≥30 years (standard indoor operating conditions)
Applicable Environment: Indoor; normal temperature and humidity; free from highly corrosive gases
Product Features: Fire- and explosion-proof; maintenance-free; energy-efficient and eco-friendly; stable operation
The equipment is designed solely for installation in enclosed or semi-enclosed indoor environments; outdoor use—including exposure to rain or direct sunlight—is strictly prohibited. The installation area must be well-ventilated and free from flammable, explosive, or highly corrosive gases and dust accumulation. Ambient temperature and humidity must meet standard operating requirements for electrical equipment to prevent moisture and condensation from compromising insulation performance.
Installation must be performed by a professional electrical team in accordance with power industry regulations. Floor-mounted units require a level, stable base and proper grounding protection. Adequate spacing must be maintained for ventilation and maintenance access; obstructions (such as walls or other equipment) blocking heat dissipation structures must be avoided to prevent malfunctions caused by poor heat dissipation.
The equipment operates fully automatically, requiring no manual monitoring or routine maintenance other than periodic surface dust removal. Long-term overload operation is prohibited; the load must remain within rated limits. Integrated protection devices automatically safeguard the unit against grid voltage fluctuations or line faults, allowing for a normal restart once the fault is cleared.
Q1: What is the key difference between this dry-type transformer and traditional oil-immersed transformers?
The primary difference lies in the insulation and cooling media. Usune dry-type transformers use air for insulation and cooling, whereas traditional units rely on insulating oil. This design fundamentally eliminates risks such as oil leaks, fires, and explosions. Additionally, the product offers advantages such as low noise, low partial discharge, and eco-friendly, maintenance-free operation, making it ideal for indoor, high-density, and high-standard power distribution environments.
Q2: What is the service life and long-term maintenance cost of the 600/630kVA dry-type transformer?
Under standard indoor operating conditions, this Usune transformer has a service life of over 30 years. As the unit lacks vulnerable oil-circuit components, it does not require the periodic oil testing, replacement, or seal maintenance associated with oil-immersed transformers, ensuring a maintenance-free lifecycle. Users only need to perform simple, periodic dust removal; long-term maintenance costs are extremely low, making the total cost of ownership far superior to that of traditional equipment.
Q3: In what installation scenarios can this transformer be used?
This product is specifically designed for indoor power distribution and is not suitable for outdoor installation. It is widely applicable to enclosed or semi-enclosed environments—such as commercial buildings, shopping malls, schools, hospitals, urban subways, and indoor industrial workshops—where safety, environmental protection, and noise control are critical. It is compatible with 11kV medium-voltage distribution systems and provides stable conversion to 440V low-voltage power supply.
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