- Berry Type Transformer Definition: A berry type transformer is defined as a transformer with a core resembling the spokes of a wheel, known for its distributed magnetic circuit.
- Core Design: The core has multiple magnetic flux paths, creating more leakage flux and reducing efficiency compared to core and shell-type transformers.
- Cooling Mechanism: The transformer’s coils are kept cool by circulating transformer oil inside a tightly fitted metal tank, which also provides additional insulation.
- Usage: Berry type transformers are mainly used for high-capacity applications due to their efficient heat distribution and unique core design.
- Diagram: The diagram shows HV and LV windings wound on the core, highlighting the multiple paths available for the magnetic circuit.
What is a Berry Type Transformer?
A berry type transformer (or “berry transformer”) is defined as a transformer with a core resembling the spokes of a wheel. Transformers can be classified into three types based on the core design:
- Core type transformer
- Shell type transformer
- Berry type transformer
A berry type transformer is sometimes considered a shell type transformer. However, its unique core design and shape give it the distinct name of berry type transformer.
It has a distributed magnetic circuit with multiple magnetic flux paths. This leads to more leakage flux and, consequently, lower efficiency compared to core type and shell type transformers.
Berry type transformers are typically housed in tightly fitted metal tanks made from high-quality steel plates, ensuring a rigid structure.
The tanks are filled with transformer oil. It is used for insulation purposes. Hence, it is also known as insulation oil. All assembly of transformer is immersed in transformer oil.
The transformer oil is circulating inside the tank. Therefore, it helps to keep the coils cool. Also, transformer oil is a good insulator and provides additional insulation.
Why is a Berry Type Transformer Used?
In berry type transformer, the flux has many paths available, and it has a separate core to complete the magnetic circuit. In most cases, this type of transformer is only used to build high-capacity transformers.
Due to the unique construction of the core, the heat produced in the winding is distributed. So, in this type of transformer, the coils remain cooler than a core and shell-type transformer.
Hence, this type of transformer is used to build a large capacity of a transformer. For a small rating of transformer, this type of construction is not used.
Berry Type Transformer Diagram
The core of a berry type transformer looks like spokes of wheels. The core of this transformer is constructed in such a way that the magnetic circuit finds a number of paths to pass flux.
HV and LV windings are wound on the core, as shown in the figure below.
