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Box-type transformer substations are mainly divided into the following types according to their structure, design and application scenarios.
The high and low voltage complete sets and transformers are installed in a metal box, and an operation corridor is left in the box for easy maintenance and operation. However, it is relatively large in size and is rarely used at present.
Instead of using existing complete sets of equipment, high and low voltage control and protection electrical equipment are directly integrated in the box to form a compact whole. The design considers maintenance-free, no operation corridor is required, and the box is small. However, the small size makes it suitable for a variety of application scenarios, such as residential areas, urban public transformers, etc.
The high-voltage control and protection devices are simplified, and the high and low voltage distribution devices and the transformer body are integrated in the transformer oil tank to form a compact whole. However, the integrated box-type substation is smaller in size, close to the oil-immersed transformer of the same capacity, and only about one-third of the European box-type transformer.
The structure is similar to that of European box transformer, but it is optimized for the "underground" requirement and is divided into two forms: semi-buried and fully buried. However, it occupies a small area and even does not occupy the ground area, which is suitable for urban land shortage areas.
It looks similar to a container and consists of a prefabricated box, secondary power transformation equipment, cabin auxiliary facilities, etc. It is manufactured and assembled in the factory and then transported to the site for installation. It is suitable for large and complex projects and has a high level of intelligence and standardization.
It is essentially a European box transformer with a "pin-shaped" layout, which is smaller in size and suitable for places such as urban main roads and busy streets. It occupies a small area (usually less than 3 square meters), has superior performance, and is easy to operate and maintain.
There are various types of box substations, each with its own unique structure and applicable scenarios. The two most common types are European-style box transformers and American-style box transformers, which are characterized by compactness and small size respectively; underground box transformers and miniaturized box transformers provide solutions to the problem of urban land shortage; prefabricated cabin-type box transformers are suitable for large and complex projects.
