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. In the context of dry-type transformer manufacturing, the vacuum epoxy resin casting process is commonly used for electric insulation. While there are different methods for casting resin, including vacuum casting and atmospheric pressure gelation (APG), the vacuum epoxy resin casting process is generally considered more advanced and widely used.

The vacuum epoxy resin casting process, as described earlier, involves encapsulating the transformer windings and core in epoxy resin under vacuum conditions. This method ensures effective impregnation of the resin and removal of air and moisture, resulting in high-quality insulation.

On the other hand, the pouring process you mentioned is a more traditional and less commonly used method for transformer insulation. In this process, the epoxy resin is simply poured over the windings and core without the use of vacuum or controlled impregnation. While this process may still be utilized in certain applications, it is generally considered less rigorous and may result in lower-quality insulation compared to vacuum epoxy resin casting.

It's important to note that advancements in technology and manufacturing processes have led to the widespread adoption of vacuum epoxy resin casting due to its superior insulation properties, mechanical strength, and overall performance.

On the other hand, the APG (Atmospheric Pressure Gelation) process is another method used for casting resin. In the APG process, the resin is mixed with a catalyst and injected into a mold under pressure, where it undergoes a chemical reaction to solidify and form the insulation.

Both the vacuum epoxy resin casting and APG processes are used for transformer insulation, but they differ in terms of the application method and the equipment used.

Regarding the statement that the casting process is the most rigorous and primitive process, it's important to note that the casting processes, including both vacuum epoxy resin casting and APG, have their own advantages and considerations. The choice of process depends on factors such as the specific requirements of the transformer, production volume, equipment availability, and industry standards.

While the vacuum epoxy resin casting process is generally considered more widely used and advanced, the APG process is also popular in certain regions or industries. The APG process can offer advantages such as shorter curing times and the ability to produce large units. However, it may require specialized equipment and molds.

Ultimately, the selection of the casting process depends on various factors, and both vacuum epoxy resin casting and APG have their own merits and applications. It's important to evaluate the specific requirements and constraints of a project to determine the most suitable casting process.