News

Those working in the casting industry all know. Medium-frequency electric furnace It is a commonly used melting tool in steelmaking, ironmaking, and casting, and its obvious advantages in environmental protection and energy conservation have led to its widespread adoption.
However, as medium-frequency induction furnaces have evolved toward larger capacities, an increasingly prominent issue has emerged: how to select high-quality insulation varnishes for furnace coils. Ensuring the insulation of induction coils has become a significant obstacle hindering the further development of larger-scale induction furnaces.
The underlying reason is primarily that as the capacity of electric furnaces continues to increase, their power output also rises accordingly. To achieve higher power levels, it becomes necessary to increase coil density—meaning the spacing between coils becomes progressively smaller. Under such conditions, if the insulation varnish used for the furnace coils is not properly selected, Coil If the insulation performance is not guaranteed, it can easily lead to inter-turn arcing and leakage current. This not only reduces the electric furnace’s power output, increases melting time, lowers production efficiency, and raises operating costs, but more seriously, it can also create potential safety hazards—such as coil explosions or the furnace failing to start—resulting in severe malfunctions.

There are many reasons why medium-frequency induction furnaces can experience arcing. Typically, the operating environments of medium-frequency induction furnaces are quite harsh, and high temperatures are the most significant factor in damaging the insulation coating on the furnace coil’s surface. Once the surface insulation is compromised, humid working conditions and dense metal dust can easily trigger arcing in the coil. Therefore, finding an insulating varnish that is both highly temperature-resistant, easy to apply and install, boasts strong adhesion, and offers long service life has become a key factor in overcoming the challenges associated with the large-scale development of medium-frequency furnaces. Kanda Induction Furnaces uses premium-quality insulating varnishes—feel free to inquire for more information.