The Three-Phase American-Type Pad-Mounted Transformer, also known as the American prefabricated substation, is a fully integrated outdoor compact power distribution solution designed for modern energy infrastructure. This advanced unit combines high-voltage switchgear, fully sealed oil-immersed transformer, low-voltage distribution device, and comprehensive protection components into a single co-tank integrated structure. With a footprint only 1/3 to 1/5 of comparable European-style units, it delivers exceptional space efficiency without compromising performance. Strictly manufactured to ANSI and IEEE international standards, our pad mounted transformer offers reliable power distribution for systems up to 40.5kV and capacities ranging from 50kVA to 7500kVA. Its robust construction and maintenance-free design make it the preferred choice for utility companies, industrial facility operators, and renewable energy developers worldwide.
Zisheng are a professional 19+ years manufacturer in producing Oil-Immersed Transformers, Compact Substation, Pad Mounted Transformers, Pole Mounted Transformers and Dry Type Transformers. We own the certificates of ISO/CE/IEC 60076 and TUV Rheinland.
Transformers undergo rigorous FAT and type testing, support voltage/capacity customization. Welcome to consult for Catalog and Product. you can contact us at email [email protected].
Key Features & Benefits
Integrated Space-Saving Design
Our American-type pad-mounted transformer eliminates the need for a separate power distribution room. It can be directly installed on a simple concrete cushion, significantly reducing land acquisition and construction costs. This compact design is particularly valuable in urban areas where real estate is at a premium, allowing installation in sidewalks, parking lots, and building basements.
Fully Sealed Oil-Immersed Construction
The transformer core and windings are housed in a hermetically sealed low-carbon steel oil tank, secured with stainless steel bolts and oil-resistant rubber rings. This design prevents oil leakage and protects internal components from moisture, dust, and corrosion, ensuring reliable operation in harsh outdoor environments for decades with minimal maintenance.
High Efficiency & Low Energy Loss
Equipped with premium low-loss silicon steel sheets and an optimized electromagnetic structure, our outdoor pad-mounted transformer achieves industry-leading energy efficiency. Controlled winding temperature rise and reduced no-load losses translate to significant long-term energy savings for commercial and industrial customers.
Comprehensive Protection & Safety
The high-voltage section features 200A elbow-type connectors or 600A T-type fixed cable joints, supporting live plugging/unplugging for safe maintenance. Integrated zinc oxide arresters and plug-in fuses provide dual protection against overcurrent and overvoltage events, ensuring uninterrupted power supply.
| Item | Specification |
|---|---|
| Product Name | Three Phase American-Type Pad Mounted Transformer |
| Rated Capacity | 75kVA – 5000kVA |
| Voltage Class | 10kV / 11kV / 13.8kV / 15kV / 22kV / 33kV |
| High Voltage Range | ±2×2.5% or ±5% |
| Low Voltage | 400V / 415V / 433V / 480V |
| Frequency | 50Hz / 60Hz |
| Phase | Three Phase |
| Cooling Method | ONAN (Oil Natural Air Natural) |
| Insulation Medium | Mineral Oil / FR3 Insulating Fluid |
| Vector Group | Dyn11 / Yyn0 |
| Impedance Voltage | 4% – 6% |
| Temperature Rise | 55°C / 65°C |
| Insulation Level | LI75AC35 / LI95AC38 |
| Protection Degree | IP33 / IP44 |
| Tank Material | Carbon Steel / Stainless Steel |
| Winding Material | Copper / Aluminum |
| Installation Type | Outdoor Pad Mounted |
| Standards | ANSI / IEEE / DOE / IEC |
| Tap Changer | No-load Tap Changer |
| BIL | 95kV / 125kV / 150kV |
| Short Circuit Resistance | Excellent Dynamic & Thermal Stability |
| Operating Environment | High Temperature, High Humidity, Coastal Areas |
| Optional Components | Load Break Switch, Bayonet Fuse, Current Limiting Fuse, Lightning Arrester, Pressure Relief Valve |
| Application | Power Distribution, Solar Projects, Commercial Buildings, Industrial Plants, Mining, Infrastructure Projects |
Urban Power Grid Upgrading: Replaces outdated equipment in residential and commercial districts
Industrial Parks: Powers manufacturing facilities and production lines
New Energy Grid Connection: Integrates solar and wind farms into the main grid
Rural Electrification: Provides reliable power to remote villages and agricultural areas
Commercial Developments: Supplies electricity to shopping centers, office buildings, and hospitals
We understand that every project has unique requirements. Our three-phase pad-mounted transformer can be customized with:
Tailored low-voltage outgoing circuit configurations
Special corrosion-resistant coatings for coastal and industrial environments
Custom voltage ratios and tap settings
Additional monitoring and remote control capabilities
Various enclosure colors and finishes to match site aesthetics
No. The fully sealed, weather-resistant design allows direct outdoor installation on a concrete cushion without any additional shelter.
Under normal operating conditions, the fully sealed tank minimizes oil degradation. Oil replacement is rarely necessary; only periodic sampling and testing are recommended to ensure oil quality.
Yes. We use corrosion-resistant materials including stainless steel bolts and optional special coatings to withstand salt spray and harsh marine environments.
Absolutely. We offer fully customizable low-voltage outgoing schemes to meet the specific power requirements of industrial parks, residential communities, and renewable energy projects.
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