Pad‑mounted transformer, also called American‑type combined transformer, is a fully‑sealed oil‑immersed outdoor distribution unit originated from North America. Its standard capacity ranges from 75 kVA to 2500 kVA, compatible with both 50 Hz and 60 Hz grids. Copper or aluminum windings are optional. Galvanized steel enclosure reaches IP54 protection grade for outdoor application.
Different from European box‑type substation with separated compartments, its transformer core‑coil assembly, high‑voltage load switch and dual‑element fuses are housed inside one shared sealed oil tank without conservator. Its overall size is only one‑third of equivalent European version. Mounted on concrete pad directly, it is fully pre‑assembled in factory; only cable connection is required on‑site to cut construction work. It adopts ONAN oil natural air natural cooling. HV dual‑element fuses provide overload and short‑circuit protection. Separate low‑voltage compartment accommodates metering and multiple outgoing feeders, supporting both radial and ring‑network power supply.
It is widely deployed along urban street corners, residential green belts, commercial blocks, solar power plants and energy‑storage projects. For instance, one single pad‑mounted unit can supply power for dozens of residential houses in North‑American suburbs. It works reliably within ambient temperature ‑20℃~+40℃. Nevertheless, shared‑tank design limits inner maintenance space, making later‑stage modification less flexible. Normal production lead time is 25‑35 days. Mineral oil or eco‑friendly FR3 fluid can be selected. Units for North‑American markets can comply with ANSI and NEMA standards upon request.
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