Three phase small pad mounted transformer

Three phase small pad mounted transformer

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Three phase small pad mounted transformer

Rockwell transformer Co.,Ltd. offer an environmentally responsible, high efficiency, safer choice. The units have high-fire-point fluid, providing fire safety benefits, and a projected life well beyond that of a traditional mineral-oil transformer. These efficient and cost-effective transformers use Envirotemp™ FR3™ fluid. Envirotran transformers are manufactured in 50 - 10,000kVA, in primary voltage classes of 11kV,15 kV, 25 kV and 35 kV.




Primary Voltage

Up to 34,500 V

Secondary Voltage

208-14,400 V


Three-phase, pad-mounted transformers, for use on underground power distribution systems, are best suited for commercial applications in public access areas and where underground service is required. These transformers meet modern design requirements for flexibility and provide a visually pleasing installation. Construction allows installation in locations accessible to the general public without the need for protective fencing or vaults. These units are ideally suited for apartment buildings, schools, hospitals, shopping centers, commercial buildings, or industrial sites.


Environmental Information:

-Sealed tank construction

-Special waste disposal considerations

-Insulation temperature limit: 120 °C

-Temperature rise: 65 °C (standard); 55 °C or 55/65 °C (optional)


Special Design Options:

-Special sound requirements

-Special altitude requirements

-Retrofit designs

-Higher efficiency requirements

-Special ambient conditions


Applicable Standards:

-IEEE C57.12.00—Standard General Requirements for Liquid-Immersed Distribution, Power, and Regulating Transformers

-IEEE C57.12.34—Requirements for Pad-Mounted, Compartmental-Type, Self-Cooled, Three-Phase Distribution Transformers, 2,500 kVA and Smaller: High Voltage, 34,500 GrdY/ 19,920 V and Below; Low Voltage, 480 V and Below

-IEEE C57.12.28—Standard for Pad-Mounted Equipment—Enclosure Integrity

-IEEE C57.12.70—Standard for Terminal Markings and Connections for Distribution and Power Transformers

-IEEE C57.12.80—Standard Terminology for Power and Distribution Transformers

-IEEE C57.12.90—Standard Test Code for Liquid-Immersed Distribution, Short-Circuit Testing of Distribution and


Three-phase small pad-mounted transformer for use on underground power distribution systems。