Vacuum Pressure Impregnation Plant In India - AR ENGINEERING

Vacuum Pressure Impregnation Plant

Vacuum Pressure Impregnation (VPI) is a process that uses vacuum and pressure to seal porous materials with varnish or resin. The process is used primarily for high-voltage motors and generators to fill gaps in materials to create a void free insulation in various devices.

The Vacuum Pressure Impregnation Process :

AR ENGINEERING specializes in vacuum pressure impregnation, which is more effective than traditional dip-and-bake methods and is better suited to high voltage motors and generators. Our basic vacuum pressure impregnation motor repair process comprises several steps.

Preheating : We place the equipment in an oven that heats the equipment and allows moisture to evaporate. This helps the resin better penetrate the material.

Vacuum Drying : We remove the equipment from the oven and place it into a vacuum chamber, which removes air and any remaining moisture.

Filling : We fill the chamber with resin, coating the part and filling in all the gaps and pores in the piece of equipment.

Wet Vacuuming : We reduce the vacuum levels and hold it for a set period of time.

Pressure/Soaking : We increase pressure within the chamber using dry air, nitrogen, or other gases. This allows for even deeper penetration of the resin.

Draining : We then vent the pressure, drain the chamber of excess resin, and remove the part.

Curing : Finally, the equipment is placed into an oven to cure the resin.

IMPREGNATION TYPES

• Varnish Impregnation
• Oil Impregnation
• Casting Impregnation

Trickle Impregnation Machine Manufacture In India - AR ENGINEERING

Trickle Impregnating Machine

In today’s competitive world the electrical insulation materials and the processes are viewed with tremendous cost and quality consciousness. Varnishing of electrical machine winding forms a major part of the total cost of the electrical insulating materials. With the increasing costs of energy and solvents for use in varnishing, it has become a need of the hour to look into the change in the conventional impregnation methods such as Dip and bake varnishing or the Vacuum impregnation.​
On this background Trickle impregnation technique was evolved to improve the varnishing quality coupled with reduced cost. This technique is now well accepted and used for impregnating stators / fields and armatures / rotors in all the advanced countries.

Trickle Impregnation Technique :

According to the principle of Trickle Impregnation, activated resin is trickled in a thin jet on to the rotating preheated winding. The resin immediately gets heated and its viscosity is reduced. Due to the rotary motion of the winding the resin gets distributed evenly inside the winding without any drain loss. The heated winding accelerates the gelling and curing of the resin.

The resin applied on the winding is quickly sucked through the slots. Assisted by the capillary action it pushes out the trapped air from the small voids and gaps in the winding and penetrates evenly in all the voids.

The essential point for successful application of the trickle impregnating resin is the correct adjustment and the control of the winding temperature.

setting and the control of the winding temperature.