The Evenson Power Pad Mounted Transformer delivers safe, tamper-resistant voltage step-down from a locked, ground-level steel cabinet on a concrete pad.
The Evenson Power Pad Mounted Transformer is a ground-mounted distribution transformer housed in a locked, tamper-resistant steel cabinet that sits on a concrete pad. Designed for underground (rather than overhead) distribution systems, it brings medium-voltage power to a safe, enclosed location at grade and steps it down to the low voltage that homes, businesses, and facilities use.
Because all energized components are sealed inside a robust, lockable enclosure with no exposed live parts, pad-mounted transformers are ideally suited to public spaces such as neighborhoods, shopping centers, campuses, and commercial parks where safety and appearance both matter. Evenson Power builds these units for durability, public safety, and dependable long-term service.
A pad-mounted transformer is a distribution transformer enclosed in a metal cabinet and mounted on a concrete pad at ground level, fed by underground cables. Its high-voltage compartment contains the bushings, tap changers, fuses, and load-break switches, while a separate low-voltage compartment houses the secondary terminals and gauges. The oil tank at the core of the unit holds the iron core, copper or aluminum coils, and insulating fluid.
This dead-front, fully enclosed design allows the transformer to be safely located close to the loads it serves, without fencing or elevated structures, making it the standard choice for modern underground distribution.
Evenson Power pad-mounted transformers are built with a heavy-gauge steel cabinet finished in a durable, weather- and corrosion-resistant coating, mounted over an oil-filled tank that serves as the central reservoir housing the core, coils, and insulating fluid. The enclosure is divided into segregated high-voltage and low-voltage compartments behind a lockable, tamper-resistant door system that protects the public and authorized personnel alike.
The high-voltage compartment integrates bushings, tap changers, fuses, and load-break switches, while the low-voltage compartment provides the secondary terminals and metering. Pressure-relief devices, temperature indicators, and a stainless-steel nameplate complete a rugged, field-ready package.
Evenson Power pad-mounted transformers cover a capacity range from roughly 15 kVA up to 10,000 kVA, with common ratings including 25, 50, 150, 500, 1,500, and 2,500 kVA. Single-phase units are typically offered from about 10 to 220 kVA for residential and light-commercial service, while three-phase units serve larger commercial and industrial loads.
The voltage class for pad-mounted duty extends up to 35 kV, with standard primary voltages in the 2.4 kV to 35 kV range. Each unit is configured to the precise primary and secondary voltages required at its installation point.
Pad-mounted transformers from Evenson Power combine public safety, reliability, and clean aesthetics, making them the preferred choice wherever underground distribution feeds occupied areas.
Pad-mounted transformers are the standard step-down unit for underground distribution systems. In residential developments they sit unobtrusively at the curb or property line, feeding homes from buried cables. In commercial settings they serve shopping centers, office parks, and mixed-use complexes.
Industrial sites use them to supply plant and process loads, while public infrastructure such as schools, hospitals, parks, and municipal facilities relies on them for safe, accessible power. Their enclosed design makes them suitable for virtually any location where safety and appearance are priorities.
Evenson Power pad-mounted transformers are designed and tested to IEC, IEEE/ANSI, NEMA, UL, and CE standards, with single-phase units built to applicable ANSI and NEMA requirements. Each unit undergoes routine factory testing including turns ratio, winding and insulation resistance, dielectric withstand, polarity, and no-load and load-loss measurement.
Enclosure integrity, tamper resistance, and the operation of switching and protection devices are verified before shipment, and full test documentation accompanies every transformer.
Installation involves setting the cabinet on a properly designed concrete pad with cable-entry provisions, landing the underground primary and secondary cables, and bonding the unit to the grounding system. The dead-front design allows safe cable connection, and commissioning checks confirm voltage, polarity, switching, and protection before energization.
In service, pad-mounted transformers require little maintenance. Evenson Power recommends periodic inspection of the enclosure, locks, bushings, and oil level, along with thermographic checks and verification of pressure-relief and temperature devices. Under normal operating conditions these units provide 30 to 40 years of reliable service.
Evenson Power pad-mounted transformers are engineered to keep power safe, reliable, and out of sight in the communities and facilities they serve. With rugged tamper-resistant enclosures, dead-front safety, and efficient, long-life electrical design, each unit is built and tested to deliver decades of dependable underground distribution. For utilities, developers, and facility owners, Evenson Power is the dependable American choice.
Evenson Power pad-mounted transformers are engineered as tamper-resistant, dead-front units suitable for installation in public and commercial environments without protective fencing. The compartment is secured with a pentahead-bolted, hooded door arrangement that meets industry tamper and intrusion requirements, while the dead-front bushing wells ensure no energized parts are exposed to operators during switching or cable connection.
The enclosure is fabricated from heavy-gauge steel or stainless steel and finished with a multi-stage coating system that withstands ultraviolet exposure, salt fog, and coastal humidity. A welded sill and recessed cable area contain any oil release, and units can be supplied with environmentally friendly biodegradable ester fluid to reduce fire risk and groundwater impact where regulations require it.
Each unit is supplied with clear bilingual warning labels, arc-resistant compartment barriers where specified, and grounding provisions that simplify safe connection to the station earth grid.
Evenson Power offers pad-mounted transformers across the 75 to 5000kVA range in both loop-feed and radial-feed configurations, allowing the same platform to serve simple single-source connections or fully looped distribution networks. Loop-feed units are equipped with load-break bushing wells and a tap-changer switch so that downstream feeders can be sectionalized and isolated without de-energizing the transformer.
A wide range of options can be specified to match the application, including fused or non-fused designs, bayonet and current-limiting fuse combinations, oil or ester dielectric fluid, and a choice of voltage classes and tap ranges. Enclosure colour, mounting footprint, and cable entry arrangements can be adapted to match utility standards and existing pad foundations.
Monitoring accessories such as oil-level gauges, pressure-vacuum gauges, dial thermometers, and remote temperature sensors are available, enabling integration with SCADA and condition-monitoring systems where network visibility is required.
| Rated Power | 15 kVA – 10,000 kVA |
| Common Ratings | 25, 50, 150, 500, 1,500, 2,500 kVA |
| Voltage Class | Up to 35 kV |
| Primary Voltage | 2.4 kV – 35 kV |
| Phases | Single-phase (10–220 kVA) and three-phase |
| Frequency | 50 / 60 Hz |
| Mounting | Ground-level concrete pad; underground fed |
| Enclosure | Locked, tamper-resistant dead-front steel cabinet |
| Cooling | ONAN (oil-immersed) |
| Core | Iron / grain-oriented silicon steel |
| Windings | Copper or aluminum |
| Insulation | Mineral or vegetable insulating oil |
| Tap Changer | Off-circuit tap changer |
| Protection | Internal fuses and load-break switches |
| Standards | IEC, IEEE/ANSI, NEMA, UL, CE |
| Service Life | 30 – 40 years |
Engineered, certified and delivered under the Evenson Power name.
