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Vacuum Pressure Impregnation (VPI) is a state-of-the-art process to ensure resin penetration (conductor wetting) into new windings. Resin penetration is vitally important to obtain maximum moisture resistance and reduce winding conductor movement as conductor movement can lead to insulation failures. Sloan Electric uses an epoxy resin, Epoxylite 478 Thixotropic, for chemical and water resistance, minimal environmental effects, hermetic gas compatibility, 100% solids composition (means no voids) and its higher build – meaning more mechanical strength. We can offer water submergence design and proof testing when required.
The process consists of:
· Placing the winding in a vacuum/pressure vessel.
· Subjecting the winding to a near-perfect vacuum to remove any residual moisture.
· Submersing the winding in the epoxy resin while under a vacuum.
· Pressurizing the epoxy and winding to 90 PSI for a time period determined by the design of the insulation system.
Sloan Electric uses the Vacuum Pressure Impregnation (VPI) process for windings:
· Used on variable frequency drives;
· Used in a demanding motor application;
· With winding insulation systems rated over 600 VAC;
· For equipment frames of 320 and higher;
· When specified by the customer.
Sloan Electric’s VPI capability is to handle windings up to 71” in diameter and 70” high.
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