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Pad Mounted Transformer - American type Substation
The American Style three phase Pad-Mounted Substation is a fully integrated, outdoor power distribution system designed for urban grids, commercial complexes, and industrial parks.
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Pad Mounted Transformer - American type Substation
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DESCRIPTION
Product Description
The American Style Pad-Mounted Substation is a fully integrated, outdoor power distribution system designed for urban grids, commercial complexes, and industrial parks. Combining a pad-mounted transformer with high-voltage (HV) switches, low-voltage (LV) distribution units, and advanced protection systems, it delivers efficient underground cable power distribution in a compact, maintenance-optimized design.
Code and implication

Structure
Transformer: usually oil-immersed or dry type, with a capacity range of 500kVA to 2500kVA, high-voltage side voltage 15kV/25kV, low-voltage side 400V/480V.
High-voltage unit: adopts a fully insulated design, such as SF6 gas or epoxy resin casting, integrated load switch, fuse, support ring network or terminal power supply.
Low-voltage unit: contains circuit breakers, metering instruments and automatic compensation devices, modular design for easy expansion.
Box: Made of corrosion-resistant steel plate or non-metallic materials, with anti-theft locks, ventilation and heat dissipation holes and moisture-proof design, suitable for -30℃ to 40℃ environment.
Specification
Rated Voltage | 15 kV, 25 kV, 35 kV (Customizable up to 38 kV) |
Capacity Range | 75 kVA – 5,000 kVA |
Insulation Class | 200 kV BIL (Basic Impulse Level) |
Cooling Method | Liquid-filled (Mineral Oil or Biodegradable Fluid) |
Temperature Rise | ≤65°C (Winding) / ≤55°C (Fluid) |
Enclosure Rating | NEMA 3R/4X, IP67 |
Noise Level | ≤55 dB (at 1 meter) |
Features
Fully insulated and enclosed structure: High-voltage components are completely sealed to avoid exposed live parts, significantly improving safety.
Compact layout: The volume is reduced by 1/3 compared to the European style, suitable for space-constrained areas such as street green belts.
Low maintenance design: Maintenance-free components (such as fully sealed transformers) are used, combined with remote monitoring systems (temperature, load, etc.) to reduce the frequency of operation and maintenance.
Environmental protection and safety: Optional biodegradable oil or dry-type transformers are equipped with pressure relief valves and fault indicators to ensure timely emergency treatment.

Application
Urban distribution network: underground cable access to reduce visual pollution from overhead lines.
Commercial complex: high reliability power supply, support for smart meters and data communication interfaces.
Industrial area: withstand harsh environments, dust and water resistance level above IP34.
Renewable energy: compatible with photovoltaic/wind power grid connection, as a distributed energy node.

Sale Cases

Why Choose AISITE?
Rich Production Experience
With 15-year experience of production and sales, our transformers have been successfully exported to over 50 countries and regions, including Brazil, Tanzania, South Africa, etc.
Full Life-Cycle Support Service
We provide comprehensive technical support at ever stage of operation of your purchased equipment.
Professional Sales Team
Our globally-experienced sales engineers provide tailored power solutions and precise technical guidance, ensuring optional project fit for your specific requirements.
Pursue Innovation and Excellence in Serving Customers
Our technical and sales team are committed to providing customized solutions with cutting-edge technology that solve the toughest challenges facing electricity supply and meet the most stringent needs defined by the industry.

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Factory Address:500 meters southeast of Yilong Bridge in Yichuan, Luoyang, China