What Materials are Required for Dry-Type Transformers?

Dry-type transformers are widely used in local lighting, high-rise buildings, airports, docks, and CNC machining equipment. Simply put, a dry-type transformer refers to a transformer whose core and windings are not impregnated with insulating oil. Its cooling methods include natural air cooling (AN) and forced air cooling (AF). Under natural air cooling, the transformer can operate continuously at its rated capacity for extended periods. Under forced air cooling, the transformer's output capacity can be increased by 50%, suitable for intermittent overload operation or emergency overload operation. However, under overload conditions, load losses and impedance voltage increase significantly, leading to uneconomical operation; therefore, continuous overload operation should be avoided for extended periods.

Manufacturing dry-type transformers requires the use of various materials. The main material list includes: DMD (prepreg), PET, epoxy resin, filler, fiberglass cloth, glass mesh, NOMEX paper, silicone rubber, spacers, and 3240 epoxy fiberglass cloth sheets, etc. These materials play a crucial role in ensuring the transformer's stable performance, durability, and safety.

When selecting materials, a comprehensive consideration should be given to specific needs and the operating environment. For example, DMD (prepreg) and PET are mainly used to improve electrical insulation performance; epoxy resin and fillers help enhance mechanical strength and heat resistance; fiberglass cloth and glass mesh play an important role in constructing transformer structures; NOMEX paper has excellent heat resistance and mechanical stability, making it suitable for high-temperature environments; silicone rubber is widely used for sealing and insulation due to its good weather resistance and flexibility; gaskets can serve as isolation and vibration damping; and 3240 epoxy fiberglass cloth is an important material in transformer manufacturing due to its excellent electrical and mechanical properties.

The selection and combination of these materials not only ensures the reliable operation of dry-type transformers under various operating conditions but also improves their adaptability to extreme environments. Therefore, when designing and manufacturing dry-type transformers, it is essential to strictly adhere to relevant technical standards and specifications to ensure the quality and performance of the final product.