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HOME >> PRODUCTS >>Vacuum Equipment >> Vacuum Pressure Impregnation (VPI) System for Motors, Transformers & Castings
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Vacuum Pressure Impregnation (VPI) System for Motors, Transformers & Castings

Engineered for superior performance, this VPI plant delivers deep vacuum dehydration and high-pressure varnish/oil immersion for electrical motors, dry transformers, capacitors, and industrial materials (graphite, castings, wood). The process removes moisture/gas (residual water ≤10ppm) and forces insulating agents into micro-gaps, greatly improving dielectric properties, moisture resistance, and structural compactness.

Key Highlights:

  • Versatile Applications: Motors (wind turbine, EMU traction, HV), dry transformers, bushings, capacitors, graphite, engine castings, refractory bricks.

  • Precision Vacuum & Pressure: Tank vacuum ≤500Pa (no load), working pressure ≤0.6MPa, leakage rate ≤100Pa·L/s.

  • Automated PLC Control: Full automation with safety alarms, interlock protection, optional heating/cooling.

  • Multiple Tank Sizes: 1200×1600mm, 1600×1800mm, 1800×2000mm, custom designs.

  • Process Advantages: Short impregnation time, reusable agent, eco-friendly, high production efficiency.

  • Enhanced Material Properties: Eliminates micro-leaks in castings, improves graphite density/strength, modifies wood/refractory with diffusing agents.

Achieve superior insulation and sealing. 


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Description

1. Overview

The Vacuum Pressure Impregnation (VPI) System is a state-of-the-art plant integrating pressure vessel, vacuum, pressurization, refrigeration, heating, and automatic control. It is mainly applied to small & medium motors but also serves dry transformers, capacitors, and material modification industries. The equipment dehydrates and degasses workpieces in vacuum, then permeates insulating varnish or diffusing agents under pressure, upgrading insulation and mechanical properties.

2. Key Technical Parameters

Tank Dimension (mm)

Limited Vacuum (No Load)

Leakage Rate

Working Pressure

Heating/Cooling

Remarks

1200×1600

≤500 Pa

≤100 Pa·L/s

≤0.6 MPa

Optional

Standard model

1600×1800

≤500 Pa

≤100 Pa·L/s

≤0.6 MPa

Optional

Standard model

1800×2000

≤500 Pa

≤100 Pa·L/s

≤0.6 MPa

Optional

Standard model

Custom Made

≤500 Pa

≤100 Pa·L/s

≤0.6 MPa

Optional

Tailored to needs

3. Core Advantages & Features

① Advanced Process Performance

  • Vacuum stage: Dehydration (residual water ≤10ppm) and degassing, reducing water/air impact on insulation.

  • Pressure stage: Insulating varnish permeates inner structure, upgrading electrical performance and moisture resistance.

  • Impregnating agent reusable, reducing environmental pollution.

  • Short processing time, high efficiency, excellent dielectric properties.

② Wide Industry Application

  • Electrical: Wind turbine, EMU traction motor, high voltage motor, dry transformer, dry bushing, capacitor.

  • Materials: Graphite (increases compactness, strength, electrical resistance), engine castings/high-pressure valves (solves micro-leakage, improves qualification rate), refractory bricks/wood (substrate modification via asphalt/anti-separation agents).

③ Automated & Safe Operation

  • PLC or computer-based fully automated measurement and control.

  • Safety alarm and interlock protection ensure secure use.

  • Optional heating/cooling systems for varied process needs.

  • Carefully designed pressure vessel with robust construction.

④ Working Principle

Workpiece placed in vacuum pressure vessel → vacuum removes moisture/gas → flooding liquid injected via pressure difference or transfer pump → pressure applied to immerse liquid into gaps → full impregnation achieved.

4. Equipment Classification

  • Wind turbine, EMU traction motor, high voltage motor VPI equipment

  • Dry type transformer VPI equipment

  • Dry bushing, capacitor VPI oil immersion equipment

  • Other diffusion/impregnation equipment

→ Contact our engineering team for a detailed quotation, technical layout, or factory demonstration.


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