Why Have Prefabricated Container-Type Substations Become So Widely Used?

The large-scale development of clean energy sources such as wind and solar power has presented new challenges for power infrastructure: 

traditional concrete substations involve long construction cycles, require large land areas, and entail complex on-site construction, making it difficult to fully meet the demands of rapid deployment and flexible grid integration for new energy projects. It is against this backdrop that prefabricated container-type substations have emerged, serving as the “power heart” of new energy generation projects and providing innovative solutions for the efficient transmission and grid integration of green electricity.

What Is a Prefabricated Container-Type Substation? 

As the name suggests, a prefabricated container-type substation is a modular substation that integrates core equipment—such as high-voltage switchgear, transformers, low-voltage distribution equipment, and secondary protection systems—from traditional substations into multiple factory-prefabricated steel containers, which are then rapidly assembled on-site. This approach transforms the traditional construction model of “on-site casting and individual installation,” shifting a significant portion of on-site work to the factory floor. It achieves “standardized design, factory production, and modular construction” for substations.

In-depth exploration of prefabricated cabin technology by specialized manufacturers such as Deyan Electric has led to the increasing maturity of this product form. It has also elevated the performance of prefabricated cabin-type substations to new heights, ensuring excellent performance in key areas such as thermal insulation, sealing and ventilation, fire safety, and temperature control, thereby providing reliable infrastructure support for new energy stations.

Thermal Insulation: 

A “Protective Suit” for Complex Climates Prefabricated container-type substations are often deployed outdoors, even in remote areas with strong winds, sandstorms, and extreme temperature fluctuations. Compared to traditional concrete structures, the container itself has lower thermal inertia, making thermal insulation design particularly critical.

High-quality prefabricated cabins feature a “three-layer structure” design: the outer layer consists of high-quality double-layer steel plates, providing robust mechanical protection; the middle layer is filled with high-performance polyurethane insulation material, which has a low thermal conductivity and effectively blocks heat transfer; the inner layer uses metal materials for both decoration and protection. Deyan Electric has further optimized this structure in its prefabricated substation products. Not only does it use high-density polyurethane, but it also specifically fills the interior of the substation doors with polyurethane foam to reduce thermal bridging between the inner and outer door panels. This design effectively prevents heat loss in cold regions and delays the intrusion of external heat in high-temperature regions, providing a stable operating environment for the precision electrical equipment inside.

Sealing and Ventilation: 

A “Respiratory System” Balancing Dust Protection and Heat Dissipation Prefabricated substation enclosures operating outdoors must prevent the intrusion of wind, sand, rain, and snow while simultaneously addressing heat dissipation generated by internal equipment during operation. This poses a dual challenge to the enclosure’s sealing and ventilation capabilities.

In terms of sealing, Deyan Electric’s prefabricated enclosures employ a dual-sealing process using high-elasticity sealant and precision bolts at the joints, achieving an overall protection rating of IP54 or higher to effectively resist the intrusion of dust and splashing water. Building on this, the product innovatively integrates a “slight positive pressure + air conditioning” integrated system. The micro-positive pressure system maintains an air pressure inside the enclosure slightly higher than the outside environment. Even if there are minute gaps, air can only flow from the inside out, thereby completely “keeping dust out.” This is particularly suitable for photovoltaic power plants or wind power step-up substations in areas with high levels of wind and sand.

Regarding heat dissipation, the enclosure features strategically placed vents and fans, combined with an intelligent temperature control system. This system automatically adjusts ventilation intensity based on internal temperature, ensuring equipment does not overheat during hot seasons while preventing excessive ventilation and heat loss during cold seasons, thereby achieving a balance between sealing and heat dissipation.

Fire Safety: 

Building a Sturdy “Fortress of Safety” The interior of a prefabricated substation houses a large concentration of electrical equipment; the consequences of a fire would be catastrophic. Therefore, fire safety is the top priority in the design of prefabricated substations.

The frame of Deyan Electric’s prefabricated cabins features a welded monocoque structure, formed by bending high-quality cold-rolled steel plates and then fully welded together. The base utilizes a structural steel frame, resulting in high overall strength and excellent impact resistance. All structural components are made of non-combustible materials. More importantly, the polyurethane insulation material filling the interior has undergone special treatment, making it a flame-retardant material that will not act as a fuel source during a fire. The entire enclosure achieves a fire resistance rating of up to 3 hours. This means that in the event of an external fire, the enclosure can maintain structural integrity for 3 hours without collapsing or burning through, thereby securing valuable time for the safe operation of internal equipment and emergency firefighting efforts. This high-level fire protection design ensures that prefabricated substation enclosures surpass certain traditional, simplified power facilities in terms of safety.

A Systematic Solution to Temperature Rise Issues During hot summer weather, if prefabricated enclosures suffer from poor ventilation or inadequate thermal management, internal temperatures may rise sharply, affecting equipment lifespan and operational reliability. To address this issue, Deyan Electric’s prefabricated enclosure products employ a systematic thermal management solution.  First, although the enclosure is primarily constructed of steel, an insulation layer effectively blocks the transmission of external heat radiation into the enclosure. Second, the enclosure is equipped with industrial-grade precision air conditioning units that automatically start and stop based on preset temperature ranges, ensuring that the internal temperature is consistently maintained within the optimal operating range for the equipment. Additionally, the internal layout has been optimized, with equipment arranged to fully account for heat dissipation pathways, thereby preventing localized heat buildup. This comprehensive temperature control system enables prefabricated substation enclosures to maintain stable and efficient operation even during the hot summer months.  Prefabricated Substation Enclosures Support High-Quality Development of New Energy  From thermal insulation and heat resistance to dustproof sealing, and from fire safety to intelligent temperature control, professional manufacturers like Deyan Electric are continuously improving the performance of prefabricated substation enclosures through technological innovation. Compared to traditional substations, they offer significant advantages, including a construction cycle shortened by more than 60%, a footprint reduced by approximately 50%, a substantial reduction in on-site civil engineering work, and the ability to be relocated and reused. In scenarios such as photovoltaic power plants, wind farms, energy storage facilities, and industrial parks, prefabricated container substations are becoming a key choice for modern power infrastructure due to their high integration, reliability, safety, and flexibility. They not only address the core challenges of power transmission but also serve as a robust and reliable “power heart” for the large-scale development and efficient utilization of new energy sources in China. In the future, with the deep integration of smart grids and digital technologies, prefabricated container-type substations will continue to evolve toward greater intelligence, automation, and low-carbon operation, contributing even more to the construction of a clean, low-carbon, safe, and efficient modern energy system.