The important role of epoxy sheets in transformers

Epoxy sheet, as a high-performance insulation material, has played a vital role in the electrical, electronic and power industries since its birth. Especially in the field of transformer manufacturing, the importance of epoxy sheet is self-evident.

What is epoxy sheet?

Epoxy sheet is a composite material made of epoxy resin bonded, heated and pressed. It has excellent insulation, mechanical strength and chemical resistance. ‌Epoxy sheet is usually made of multi-layer  fiber glass cloth impregnated with epoxy resin after lamination and  has high mechanical and dielectric properties, good heat and moisture resistance, and good machinability. It contains active epoxy groups, which can be crosslinked with a variety of curing agents to form an insoluble and non-melting three-way network structure of polymers. The epoxy sheet has high mechanical properties in the medium temperature environment, stable electrical properties in the high temperature environment, and has good moisture resistance and heat resistance.

The important role of epoxy sheets in transformers

1. Mechanical support and protection

Epoxy sheet not only has excellent electrical performance, but also has high strength and rigidity, which can provide stable mechanical support for the components inside the transformer. During the operation of the transformer, various components will be subjected to mechanical stress such as vibration and impact. Epoxy sheet can withstand these mechanical stresses and prevent components from being damaged due to excessive force. At the same time, it can also serve as a fixing device to support and protect the internal components of the transformer to ensure that they remain stable during operation.

2. Electrical insulation performance

Epoxy sheet has excellent electrical insulation performance, which is one of its most critical functions in transformers. There are high-voltage and low-voltage areas inside the transformer. And these areas must be well insulated to prevent current leakage and short circuits. The high dielectric strength and good arc resistance of epoxy sheet make it an ideal insulation material. It can effectively isolate the high-potential and low-potential components inside the transformer, ensuring that the current flows in the predetermined path, thereby ensuring the safe operation of the transformer.

3. Chemical stability and corrosion resistance

The transformer may be exposed to various chemicals during operation, such as acids, alkalis, oils, solvents, etc. These chemicals may corrode or damage the materials and components of the transformer. Epoxy sheet has good resistance to a variety of chemicals, including acids, alkalis, oils and solvents. It can maintain stable performance for a long time and is not affected by the external environment. This chemical stability and corrosion resistance enable epoxy sheet to adapt to a variety of operating environments and ensure that the transformer can maintain stable performance and life under various harsh conditions.

Epoxy sheet not only has many advantages such as excellent electrical insulation performance, mechanical support and protection performance, thermal management and heat dissipation performance, chemical stability and corrosion resistance, flame retardancy and safety, but also can adapt to a variety of operating environments. These can ensure that the transformer can maintain stable performance and life under various harsh conditions. Therefore, in the design and manufacturing process of the transformer, it is very important to choose the right epoxy sheet material.