Venwood & Baker
The VPI Oven

We introduced the VPI process, better known as:

VACUUM
PRESSURE
IMPREGNATION

The VPI tank contains the electrical motor that is being impregnated.

AN OPERATIONAL VPI PLANT

The VPI Process draws a vacuum from the tank. This process removes all the air from the windings.

The electrical motor is submerged under the resin being admitted to the tank. After a period of ‘wet’ vacuum, the vacuum is removed and pressure is applied which created the effect of driving the RESIN into the winding.

The RESIN is drained from the pressure vessel. The machine is cured at the relevant time and temperature recommended by the RESIN manufacturer.

RESIN vs VARNISH

The two different mediums used for impregnation are either SOLVENTLESS RESIN or VARNISH. We find it important to share the following information regarding RESIN & VARNISH with you.

RESIN

  • A solution dissolved in a reactive monometer.
  • 100% solid liquid
  • No loss of solvent of monometer during cure.

VARNISH

  • A solution of a resinous polymer, dissolved in a solvent carrier.
  • The solvent is merely a carrier to reduce the viscosity enough to facilitate impregnation and it does not form part of the final insulation system.

 

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