Vacuum Impregnation is a process used in the manufacturing of transformers in order to increase their lifespan which in turn increases the span of the machines that they are used in. The VPI process is an extremely effective way to eliminate dead air spaces. Dead air spaces are bad because they cause hot spots to form.

The VPI process uses resin in order to keep a low temperature pathway. Resins protect the transformer by bonding all of the components together.  There are many benefits to purchasing transformers that have been through vacuum impregnation.  Noise is reduced, higher voltages can be used, and life span is increased.

First the transformers are placed in the vacuum chamber and are vacuum pulled which removes air and gases from the chamber. The item, in this case a transformer, is then allowed to rest for twenty minutes. The next step is the addition of resin into the chamber until the transformer is completely covered with resin. It is maintained in this state at a two torr for at least 20 minutes. The vacuum is then released and the chamber pressurizes. Finally the transformers are baked for approximately twelve hours. Vacuum Impregnation was developed as a response to the short comings of the Dip and Bake method which tends to leave air pockets.
 
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