How is an Epoxy Resin Dry-Type Transformer Cast and Molded?

Epoxy resin dry-type transformers are widely used high-voltage electrical equipment in power systems. Unlike oil-immersed transformers, they do not use liquid coolants but are insulated and cooled by air or other solid insulating materials. The manufacturing process of epoxy resin dry-type transformers is not only a craft but also a technical skill. Below is a detailed introduction to this manufacturing process to help readers gain a deeper understanding of it.

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● Importance of Preparation:

Preparation is crucial before starting the casting process. First, it is essential to ensure that the casting molds are clean and dry to avoid affecting the subsequent casting quality. Next, the pre-prepared coils are placed into the casting molds, ensuring the molds are sealed around the edges and at the lead terminals, and then hoisted into the casting tank. This process requires special care to ensure the correct arrangement of the coils without any damage.

● Process Requirements for Mixing Epoxy Resin:

Mixing the epoxy resin is the most critical step in the entire casting process. The weight of the mixture needed must be accurately calculated based on the number, rating, and quantity of coils to be cast. The mixing process must adhere to specific technical requirements, including the ratio of the mixture, stirring time, and stirring speed, to ensure that the mixture meets quality standards.

●Monitoring and Adjusting the Casting Process:

During the casting process, it is necessary to closely monitor several parameters, including the flow rate from the outlet, the viscosity of the mixture, the occurrence of bubbles, and the temperature readings of various instruments. Any deviation in these parameters can affect the final product quality, so timely adjustments and control are required.

●Importance of the Curing Process:

After casting, curing must be carried out quickly to minimize the time spent in a low-temperature environment. This is because epoxy resin requires specific temperatures and time to ensure full curing and hardening. Prolonged exposure to low temperatures can affect the integrity and quality of the curing process.

●Demolding and Subsequent Processing:

Once curing is complete, the coil needs to be removed from the mold, a process known as demolding. After demolding, the coil is re-hoisted into an oven and slowly cooled with the oven. This process must be handled carefully to avoid damaging or deforming the coil.

In Summary

By following these detailed steps, one can better understand the casting and molding process of epoxy resin dry-type transformers. This process requires precise operations and strict control to ensure that the final product meets the required quality and performance standards.

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LuShan, est.1975, is a Chinese professional manufacturer specializing in power transformers and reactors for 49 years. Leading products are single phase and three phase isolation transformers, electrical transformer, distribution transformer, step down and step up transformer, low voltage transformer, high voltage transformer, control transformer, toroidal transformer, R-core transformer; DC inductors, AC reactors, line and load reactor, chokes, filtering reactor, and intermediate, high-frequency products. Our power transformers and reactors are widely used in 10 application areas: rapid transit, construction machinery, renewable energy, intelligent manufacturing, medical equipment, coal mine explosion prevention , excitation system, vacuum sintering(furnace), central air conditioning.

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