Power Transmission & Distribution

Vacuum pressure impregnation (VPI) is a key process in creating high-quality transformers and other power transmission and distribution components. VPI improves the electrical component’s insulation and protection against external factors, optimizing service life and performance. Learn more about VPI, including its benefits and applications for transformers and other electrical components.

Vacuum Pressure Impregnation Process for Transformers

The vacuum pressure impregnation process for transformers involves placing the component in a vacuum chamber, where vacuum pressure is applied to eliminate moisture and air from the transformer’s insulating material. Then the transformer’s coil insulation is impregnated with an epoxy resin under vacuum and pressure, filling in the air gaps. This process improves the transformer’s dielectric strength and reduces the risk of electrical malfunctions. The resin impregnation also protects the insulation from impurities and gradual degradation.

VPI transformers are strong, long-lasting, and capable of withstanding harsh operating conditions. The VPI process can be applied to a range of component forms and sizes, enhancing design flexibility.

Benefits of Vacuum Impregnation for Transformers

Vacuum pressure impregnation enhances transformer performance and reliability in multiple ways:

Improved dielectric strength. VPI removes moisture and air pockets, which are the main causes of insulation degradation. By sealing the insulation with resin, manufacturers increase the transformer’s dielectric strength and ability to withstand high voltages without failing.
Decreased fire danger. VPI transformers use non-flammable resin, decreasing fire risk. This feature makes them suitable for environments with strict fire safety rules.
Moisture resistance. Corrosion caused by moisture or oxidation reduces current-carrying capacity, leading to part failure. The VPI process seals leak paths from moisture infiltration that would otherwise degrade the insulation. This moisture resistance enables the transformer to be used in humid environments.
Low maintenance. This method produces more durable transformers, lowering maintenance needs over time.

Applications for Vacuum Impregnated Transformers

Due to their many performance benefits, VPI transformers are applicable in a wide range of settings, including:

Renewable energy. VPI transformers facilitate reliable, efficient electricity output from renewable energy sources such as wind and solar power.
Data centers. Vacuum impregnated transformers provide dependable and steady clean power to data centers, which require fire-safe components.
Buildings. High-rises and other structures with strict fire safety rules use VPI transformers for power distribution.
Industrial processing. VPI transformers offer mechanical durability and strength in harsh industrial processing environments.
Medium voltage distribution. Vacuum impregnated transformers also supply efficient, reliable power in medium-voltage distribution networks.

Power Transmission & Distribution Vacuum Impregnation Solutions from Godfrey & Wing

One of the major threats to transformers is moisture. It can weaken insulation and cause short circuits, breakdowns, and reduced service life. Vacuum pressure impregnation removes moisture and air gaps, enhancing transformer performance and longevity.

Godfrey & Wing’s vacuum impregnation solutions help manufacturers meet OEM requirements for quality and integrity. We offer vacuum impregnation sealants, equipment, and services. Our team is continuously developing more advanced technologies to overcome evolving challenges with new materials.