Amercia Box Transformer

TOONICE’s America Type prefabricated substation (Amercia Box Transformer) is a highly integrated outdoor power distribution equipment. It compactly integrates high-voltage switches, transformers, and low-voltage power distribution systems into a sealed cabinet, and has significant advantages such as a small footprint, easy installation, and low maintenance costs.

I. Core Technical Features

1. Structural Design:

It adopts a common-tank fully sealed structure, with the high-voltage load switch, fuse, and transformer immersed in the same oil tank. Its volume is only 1/3 of that of the European-style prefabricated substation, and the floor area is reduced by 40%.

2. Electrical Performancet:

① Voltage Rating: The primary side supports a maximum of 36kV, the secondary side outputs 690V, and the maximum three-phase capacity reaches 3000kVA.
② Protection Mechanism: Dual-fuse protection is adopted (plug-in fuse + backup current-limiting fuse). The fuse link features current and temperature-sensitive properties, enabling quick response to overload and short-circuit faults.
③ Insulation Technology: Fully insulated elbow cable plug-in technology ensures complete sealing of live parts and supports live operation under a load current of 200A.

3. Environmental Adaptability:

With a protection rating of IP67, it can operate stably in extreme environments ranging from -45℃ to +45℃. For coastal highly corrosive areas, the cabinet surface undergoes eight pretreatment procedures and seven painting processes, meeting the ISO 12944 C5M corrosion resistance grade and ensuring a service life of over 25 years.

II. Typical Application Scenarios

1. Urban and Rural Distribution Networks

It is especially suitable for load-intensive industrial parks, residential communities, and commercial centers. For example, in the renovation of old urban areas, American-style prefabricated substations can be directly floor-mounted without the need to build new power distribution rooms, simplifying the construction process while preserving the style of the neighborhood. Its compact design also makes it a preferred solution for rural power grid renovation, shortening the low-voltage power supply radius and reducing line losses.

2. New Energy Power Generation Matching

In 2023, the proportion of demand in the new energy sector had reached 41%, becoming the largest growth driver. In wind power projects, the substation can be installed at the bottom of the tower base; in solar power generation scenarios, it supports both independent use and can serve as a component of the overall solution. For example, in the pilot project of the National Energy Administration in 2025, intelligent substations integrated with energy storage functions accounted for 32%, and the peak regulation capability was increased to 2.7 times that of traditional equipment.

3. Temporary and Emergency Power Supply

The modular design supports rapid deployment within 3 days, saving 30% of investment costs compared with traditional solutions, and is widely used in construction sites, mines, and disaster relief sites. For example, in a temporary power supply project in an industrial park, the American-style prefabricated substation achieved rapid commissioning through prefabricated production, ensuring the project schedule.

III. Comparison with European Box Transformer

IV. Standards and International Competition

China has led the revision of IEC/TR 63227 “Guidelines for Special Applications of Prefabricated Substations”, which adds technical requirements for photovoltaic grid-connection and specifies the 1.5U overvoltage withstand capability and reverse power protection function.

The key parameters of American-style prefabricated substations made in China have achieved mutual recognition with European and American standards, and 83% of the test items meet the requirements for dual certification. In the RCEP regional market, the market share of Chinese products has increased from 16% in 2020 to 37% in 2025.