What is a combined transformer? What are its components?

2025,07,15

In the power system, Combined Transformer is a highly integrated distribution equipment, widely used in American Substation, industrial power and urban distribution network.

As the core component of power transmission, it combines high-voltage switchgear, transformer and low-voltage distribution device to form a compact and efficient power supply solution.

In this article, Hubei Jutai will introduce the definition, core components, working principle and industry application of combined transformer in detail to help you fully understand this key power equipment.

（Zgs American Box Combined Transformer）

What is a combined transformer?

Combined transformer, also known as American box transformer, is an outdoor complete set of equipment that integrates high-voltage power receiving, transformer step-down and low-voltage power distribution functions. Compared with traditional substations, it has the advantages of compact structure, convenient installation and simple maintenance, and is suitable for urban power grids, industrial parks, commercial buildings and other scenarios.

Core advantages of combined transformers

Highly integrated: Reduces floor space and is suitable for places with limited space.

High protection level: Fully sealed structure, dustproof, moisture-proof and corrosion-resistant.

Low loss, high efficiency: Optimize electromagnetic design to reduce no-load and load losses.

Intelligent control: Can be equipped with a remote monitoring system to monitor the operating status in real time.

Main components of combined transformers

Combined transformers are usually composed of the following core components, each of which directly affects its performance and reliability:

1. High-voltage incoming line unit

High-voltage load switch: used to connect or disconnect high-voltage power supply to ensure safe operation.

Fuse protection: blows when overloaded or short-circuited to protect the transformer from damage.

Lightning arrester: prevents lightning overvoltage from impacting the equipment.

2. Transformer unit

Oil-immersed or Dry-Type Transformer: selected according to the use environment, oil-immersed heat dissipation is better, and dry type is more environmentally friendly.

Core and winding: high-quality silicon steel sheets and high-purity copper wires are used to ensure efficient energy conversion.

3. Low-voltage distribution unit

Low-voltage circuit breaker: provides overload and short-circuit protection.

Metering and monitoring device: records power consumption data and supports smart grid management.

Reactive power compensation device (optional): improves power factor and reduces power loss.

4. Housing and auxiliary equipment

Protective housing: usually made of stainless steel or anti-corrosion steel plate, suitable for harsh outdoor environments.

Temperature control and ventilation system: ensure that the transformer operates at the optimal temperature.

（China Zgs American Box Combined Transformer）

Due to its flexibility and high efficiency, combined transformers play an important role in many fields:

1. Urban distribution network

In densely populated areas such as residential and commercial areas, combined transformers can replace traditional substations, reduce floor space, and provide stable power supply.

2. Industry and manufacturing

In places such as factories and mines that require large-capacity power supply, combined transformers can effectively reduce voltage fluctuations and ensure stable operation of production equipment.

3. New energy power generation system

In wind power and photovoltaic power stations, combined transformers are used to boost voltage and connect to the grid to improve transmission efficiency.

4. Temporary power supply sites

Such as construction sites, exhibition centers, etc., combined transformers can be quickly deployed to meet temporary power needs.

Conclusion

As a key equipment of modern power system, combined transformer is widely used in American Substation, industrial power supply and new energy fields due to its integrated design, high efficiency and energy saving and flexible installation.

As a professional manufacturer, Hubei Jutai provides high-performance and high-reliability transformer solutions to help upgrade the global power infrastructure.

For more technical parameters or customized solutions, please contact our professional team!

Author:

Mr. jiawenhan

E-mail:

JT13797437282@gmail.com

Phone/WhatsApp:

+86 13797437282