Transformer mounting types – All you need to know about different mounting types

Transformer mounting types – All you need to know about different mounting types

Transformers are indispensable in the electrical power distribution system, serving as critical nodes that adjust voltage levels to ensure efficient power delivery and user safety. The installation method, particularly the choice of mounting type, is a crucial consideration that significantly impacts a transformer’s operational efficiency, maintenance complexity, and longevity. This article delves into the variety of transformer mounting types, focusing on their characteristics, advantages, and limitations in the context of ensuring effective power distribution and system reliability. If you are looking for transformer types, check out our ultimate guide.

Transformer mounting types

Pole Mounted Transformers

Pole-mounted transformers are a common sight in residential electricity distribution. Mounted high on utility poles, they are tasked with reducing the high voltage from primary distribution lines to the lower secondary voltages suitable for household use. Being high up serves 2 purposes: it protects the transformer from accidental human contact and reduces the risk of vandalism. Despite their widespread use, the exposure of these transformers to natural elements like storms and extreme weather conditions can lead to damage, while their height requires specialized equipment and training for maintenance, potentially increasing operational costs. Furthermore, the electrical insulation and cooling in these transformers are crucial for their performance and safety, often achieved through air cooling or small amounts of insulating oil, ensuring the transformer’s winding and coil remain functional under varying environmental conditions.

Pad Mounted Transformers

Pad-mounted transformers, encased in robust metal enclosures and positioned on concrete pads, are designed to seamlessly integrate into both residential and commercial environments with underground power distribution networks. These transformers are particularly valued for their enhanced security features, including lockable enclosures that protect against unauthorized access and environmental hazards. Their design not only emphasizes safety but also aesthetic appeal, allowing them to blend into suburban landscapes. However, the initial setup, which involves the installation of concrete pads and secure enclosures, incurs higher costs. Inside these transformers, the windings and coils are immersed in insulating liquid, usually oil or less flammable alternatives, providing efficient cooling and insulation. This liquid-filled design facilitates their ability to manage larger loads and enhances their durability, but it also requires rigorous maintenance protocols to prevent leaks and environmental contamination.

Substation Transformers

Substation transformers are the heavy lifters within electrical substations, converting the high-voltage electricity from transmission lines to the lower voltages apt for distribution networks. These power transformers are engineered to handle immense electrical loads, a testament to their pivotal role in maintaining the integrity and reliability of the power grid. The space and infrastructure required for these transformers reflect their operational significance, with installations often including features like bushings for connection to high-voltage transmission lines and extensive switchgear setups for control and protection. Their complexity and the high voltages they manage demand specialized knowledge and stringent maintenance practices to ensure operational efficiency and safety.

Platform Mounted Transformers

Platform-mounted transformers offer a tailored solution for locations demanding specific placement or elevation for operational efficacy. This mounting option is versatile, accommodating various industrial and commercial settings by allowing custom installations on elevated structures or ground-based frames. This adaptability ensures that platform-mounted transformers can meet site-specific requirements, enhancing installation and maintenance efficiency. Such installations provide easy access for maintenance and enable the transformers to be positioned optimally for connection to distribution lines and load centers. However, this mounting type may require additional security measures to mitigate the risk of unauthorized access or tampering, ensuring the transformer’s primary and secondary windings, along with its insulation system, remain protected.

Ground Mounted Transformers

Ground-mounted transformers, placed directly on the earth or on simple concrete bases, offer a straightforward installation and maintenance solution, particularly suited for spacious industrial settings. This mounting type’s accessibility is a significant advantage, facilitating routine inspections and servicing. However, the absence of a protective enclosure exposes these transformers to environmental elements and potential vandalism, underscoring the importance of strategic placement and possibly necessitating additional protective measures. The design of ground-mounted transformers often includes robust insulation and cooling mechanisms, such as air or liquid-filled options, to ensure they can operate effectively in various environmental conditions without the protective barrier of an enclosure.

Indoor Mounted Transformers

Indoor-mounted transformers are designed for environments where external weather conditions pose a risk to transformer operation and longevity, such as commercial buildings and industrial facilities. Their installation inside buildings requires adherence to stringent safety and fire regulations, given the potential risks associated with indoor electrical systems. These transformers benefit from a controlled environment, which can significantly reduce wear and extend their operational life. Key considerations for their installation include ensuring there is sufficient space for the transformer and its ancillary equipment, adequate ventilation to dissipate heat, and compliance with local codes and standards to maintain safety and operational integrity.

Underground Vault Transformers

In urban areas where above-ground space is at a premium, underground vault transformers present an efficient solution, minimizing physical and visual intrusion while preserving ground space for other uses. These installations face unique challenges, including ensuring adequate ventilation to prevent overheating and managing water ingress to protect electrical components. Access for maintenance also requires specialized procedures and equipment, given the transformer’s subterranean location. Despite these challenges, underground vault installations effectively mitigate the visual impact of electrical infrastructure in densely populated areas and can enhance the overall aesthetics of urban environments.

Integrating Modern Transformer Technologies

As the demand for reliable and efficient electrical power distribution continues to grow, integrating modern transformer technologies becomes increasingly important. Dry-type transformers, for example, offer significant safety and environmental advantages in indoor and sensitive installations by eliminating the need for liquid cooling mediums. Conversely, liquid-filled transformers remain a preferred choice for their cooling efficiency and higher load capacities, particularly in outdoor or heavy-duty applications. The selection of transformer technology and mounting type must consider factors such as load requirements, environmental conditions, and space constraints to optimize power distribution system performance.


The selection of a transformer’s mounting type is a multifaceted decision that influences not only the efficiency and reliability of power distribution systems but also their safety, maintenance requirements, and environmental integration. From the elevated installations of pole-mounted transformers to the discreet and efficient use of space provided by underground vault transformers, each mounting option offers unique advantages and presents distinct challenges. A thorough understanding of these options enables informed decision-making, ensuring that the chosen mounting type aligns with operational requirements, safety standards, and environmental considerations.

At TTES, we have over 100 combined years of experience manufacturing, maintaining, and repairing large power transformers. We can take care of all concerns related to large power transformers. If you’re looking for industry-leading lead times of just 20 weeks on average, don’t hesitate and reach out to us for a free quote

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