Overview

Overhead D Series Single Phase Oil Immersed Transformer is a pole-mounted distribution transformer designed for single-phase power distribution networks. It is mainly used to step down medium-voltage power from overhead distribution lines to low-voltage power for residential users, rural power networks, small commercial facilities, farms, public facilities, and utility distribution systems.

As a single-phase overhead transformer, this product is typically installed on utility poles or overhead distribution structures. It is especially suitable for areas where overhead power lines are widely used, such as rural communities, suburban areas, remote service locations, agricultural regions, small towns, and low-density residential zones. The transformer receives medium-voltage electricity from the overhead distribution line and converts it into usable low-voltage electricity for end users.

The D Series transformer adopts an oil-immersed design. Transformer oil works as both an insulation medium and a cooling medium, helping dissipate heat generated during operation and ensuring stable electrical performance. This structure is widely used in distribution transformers because of its mature technology, reliable performance, strong overload capability, and long service life.

According to the UL certified product list, the Overhead D Series – Single Phase product has a capacity coverage of up to 333kVA and a high-voltage coverage range of 11kV to 17kV. It is listed under UL List No. E545503 and is designed with reference to IEEE standards such as IEEE C57.12.00, IEEE C57.12.28, and IEEE C57.12.90. These standards are commonly associated with distribution transformer design, construction, enclosure integrity, and test requirements.

For international markets, the product is suitable for customers who need reliable single-phase distribution transformers for overhead utility networks. It can be used by power utilities, electrical contractors, distribution companies, rural electrification projects, public infrastructure projects, and overseas power grid construction projects. The transformer can be customized according to customer requirements, including rated capacity, primary voltage, secondary voltage, frequency, connection type, impedance, accessories, protection devices, tank coating, bushing arrangement, and installation requirements.

Product Advantages

1. UL Listed Product for International Projects
The Overhead D Series Single Phase Transformer is included in the UL certified oil transformer product list. The UL listing helps improve product credibility for international markets, especially projects that require recognized certification, reliable product quality, and compliance with strict electrical requirements.

2. Suitable for Overhead Distribution Networks
This transformer is designed for pole-mounted installation and overhead distribution systems. It is ideal for utility networks, rural electrification, residential distribution, agricultural power supply, and suburban electrical systems where overhead lines are the main power distribution method.

3. Single-Phase Power Distribution Solution
The product is suitable for single-phase power supply applications. It can supply electricity to homes, farms, small workshops, street lighting systems, small commercial buildings, public service points, and other single-phase loads. For low-density areas, single-phase transformers are often more economical and practical than three-phase solutions.

4. Oil Immersed Cooling and Insulation
The transformer uses oil as the cooling and insulation medium. Oil-immersed technology provides efficient heat dissipation and reliable insulation performance, helping the transformer maintain stable operation under normal load conditions. It also supports long service life when properly installed and maintained.

5. Capacity Range up to 333kVA
With capacity coverage up to 333kVA, the transformer can meet different small and medium power distribution needs. Customers can select a suitable capacity according to load demand, local grid requirements, installation environment, and future expansion plans.

6. High-Voltage Coverage from 11kV to 17kV
The product supports high-voltage coverage from 11kV to 17kV, making it suitable for many medium-voltage overhead distribution networks. This range is practical for utility and distribution systems in multiple regions and can be adapted to project-specific voltage requirements.

7. Designed with IEEE Standard References
The transformer is designed with reference to IEEE C57.12.00, IEEE C57.12.28, IEEE C57.12.90 and related standards. These standards help guide product design, construction, testing, and performance verification, making the transformer suitable for professional power distribution projects.

8. Compact Pole-Mounted Structure
The overhead transformer is compact and suitable for installation on poles. Compared with ground-mounted equipment, pole-mounted installation saves ground space and reduces the need for additional civil construction. This is especially useful in rural and suburban distribution networks.

9. Strong Environmental Adaptability
The product can be configured with durable tank construction, outdoor surface treatment, suitable bushings, and accessories according to project requirements. This helps the transformer operate in outdoor environments and withstand common distribution network conditions.

10. Customizable for Different Utility Requirements
The transformer can be customized for different markets and utility specifications. Options may include rated capacity, voltage ratio, frequency, tapping range, bushing type, lightning arrester, mounting bracket, grounding device, protection accessories, coating color, and nameplate requirements.

Product Specifications

Product Applications

Overhead D Series Single Phase Oil Immersed Transformer is widely used in overhead power distribution networks. It is an important product for converting medium-voltage electricity into low-voltage electricity for end users in single-phase distribution systems.

In utility distribution networks, the transformer can be installed on distribution poles to serve residential areas, rural communities, small commercial users, street lighting systems, and public service points. It helps utilities extend power supply to scattered loads without requiring a large ground-mounted substation.

In rural electrification projects, this transformer is especially practical. Many rural areas use overhead distribution lines because they are easier and more economical to install over long distances. A pole-mounted single-phase transformer can provide reliable power to farms, houses, irrigation systems, small workshops, agricultural processing facilities, and remote service points.

In residential distribution, the product can be used to supply low-voltage power to houses, villas, small communities, and suburban residential zones. It is suitable for areas where load density is relatively low and single-phase power supply is sufficient.

In light commercial applications, the transformer can provide power for small shops, roadside facilities, service stations, communication points, small offices, and local public equipment. It can be selected according to the load size and voltage requirements of the project.

In public infrastructure projects, Overhead D Series transformers can be used for outdoor lighting, monitoring equipment, small pumping stations, traffic control devices, and remote utility facilities. Its pole-mounted structure makes it convenient for distributed outdoor applications.

The product is also suitable for power grid expansion and rehabilitation projects. When utilities need to upgrade existing distribution lines, add new service points, or replace old transformers, single-phase overhead transformers are often a practical and cost-effective choice.

Overall, Overhead D Series Single Phase Oil Immersed Transformer is a reliable and practical distribution transformer for overhead power networks. With UL listed product information, capacity coverage up to 333kVA, high-voltage coverage from 11kV to 17kV, and IEEE standard references, it is suitable for international utility, residential, rural, commercial, and infrastructure power distribution projects.