Vacuum Pressure Impregnation (VPI)

VPI stands for Vacuum Pressure Impregnation. VPI is a process that uses a combination of vacuum and pressure cycles to seal porous materials with a resin resulting in a void free insulation system.

Schulz has two independent VPI systems in-house, specific to the Schulz insulation system and to EPRI, respectively.

  • A winding that undergoes VPI is virtually impervious to oil, moisture and chemical contaminants.
  • Results in the greatest mechanical strength for windings, a cooler running motor, improves performance and reliability and extends machine life.
  • Can be used for AC and DC motor stators, armatures, field coils and transformers.
  • Post VPI windings will pass spray and immersion hi-pot testing.


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Vacuum Pressure Impregnation (VPI)

Vacuum Pressure Impregnation (VPI)
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