Single-Phase Pad-Mounted Transformer for an American Project

Dingxin Electric supplied a customized single-phase pad-mounted transformer solution for a residential power distribution project in America. The transformer was designed to step down the medium-voltage distribution supply to a stable low-voltage output for homes and light commercial loads.

Installed outdoors on a concrete pad, the transformer combines voltage transformation, electrical protection and connection functions inside a robust, weather-resistant enclosure. Its compact footprint and secure construction make it particularly suitable for residential communities and other public areas.

Customer Challenges

The customer required a transformer that could provide safe and reliable power in an outdoor environment while meeting the practical requirements of the American distribution network.

The main challenges included:

• Stepping down medium voltage to a standard single-phase utilization voltage
• Maintaining reliable operation in rain, sunlight, dust and changing temperatures
• Preventing unauthorized access in a residential area
• Reducing no-load and load losses over long-term operation
• Minimizing the transformer’s footprint and visual impact
• Simplifying installation, inspection and routine maintenance
• Accommodating the project’s specified cable connections and protection devices

Dingxin Electric Solution

After reviewing the incoming voltage, required capacity, secondary voltage, loading conditions and installation environment, Dingxin Electric proposed a customized single-phase pad-mounted transformer.

Customized Electrical Configuration

The transformer can be designed for common American primary distribution voltages, including:

• 34,500/19,920V
• 13,800/7,957V
• 13,200/7,620V
• 12,470/7,200V
• Other project-specific voltages

Available secondary voltages include 120/240V, 240/480V, 347V and 600V. The rated capacity can be selected from 15kVA to 167kVA according to the customer’s load requirements.

For the American market, frequency, voltage ratings, bushings, protection components and accessories can be configured according to the project specifications and applicable standards.

Tamper-Resistant Outdoor Enclosure

Because the transformer was installed close to residential loads, operational safety was a major concern. Dingxin Electric adopted a lockable, tamper-resistant metal enclosure that restricts access to live components.

The enclosure also protects the internal equipment against adverse outdoor conditions and provides convenient access for authorized operating and maintenance personnel.

Low-Loss Transformer Design

Dingxin Electric optimized the transformer’s magnetic core and winding design to reduce no-load and on-load losses. This helps the customer lower energy consumption throughout the transformer’s service life.

Depending on the selected capacity, the available series offers:

• No-load losses from approximately 50W to 350W
• On-load losses from approximately 195W to 1,410W

The final guaranteed loss values are determined by the selected rating, project specification and applicable efficiency requirements.

Integrated Protection and Operation

The transformer can be equipped with project-specific protection and operating accessories, such as:

• Bayonet-type expulsion fuse
• Current-limiting fuse
• Load-break switch
• Pressure-relief device
• Oil-level indicator
• Temperature indicator
• Drain and sampling valve
• Grounding provisions
• Surge protection
• Parking stands and cable accessories

This integrated arrangement improves system safety and reduces the amount of separate equipment required at the installation site.

Typical Product Parameters

How Dingxin Electric Solved the Customer’s Problems

The customer initially faced difficulties balancing public safety, outdoor reliability, energy efficiency and limited installation space. Dingxin Electric addressed these requirements with one integrated transformer solution:

• The sealed outdoor enclosure protected the transformer from environmental exposure.
• The lockable, tamper-resistant structure improved safety in the residential area.
• The customized voltage ratio provided the required low-voltage supply.
• The low-loss core and winding design reduced long-term operating costs.
• The compact pad-mounted construction saved installation space.
• The integrated switching and protection options simplified site installation and operation.

Project Results

After installation, the Dingxin Electric single-phase pad-mounted transformer provided stable voltage conversion for the customer’s residential distribution network. Its compact construction allowed it to be positioned close to the load center, helping shorten low-voltage cable runs and improve distribution efficiency.

The completed solution delivered:

• Stable single-phase power for residential loads
• Improved public and operational safety
• Reliable outdoor performance
• Lower transformer operating losses
• Easier installation and maintenance
• A compact and unobtrusive substation arrangement
• Greater flexibility for future distribution requirements

Conclusion

This American project demonstrates Dingxin Electric’s ability to customize single-phase pad-mounted transformers for different voltages, capacities, protection requirements and installation environments.

With its secure enclosure, efficient electrical design and flexible accessory options, the Dingxin Electric single-phase pad-mounted transformer is an ideal solution for residential communities, small businesses, commercial developments and light industrial power distribution.

Dingxin Electric — Customized Transformer Solutions for Safe and Reliable Power Distribution.