Custom Variable pressure vacuum drying furnace for transformer with less drying time and electric consumption

Vacuum Pressure Impregnation(V.P.I) is a process by which a fully wound electric apparatus stator of rotor is completely submerged in a Resin. Through a combination of dry and wet vacuum and pressure cycles, the resin is assimilated throughout the insulation system. Once thermally processed, the impregnated windings become a monolithic and homogenous structure.

The resulting benefits are;

Higher dielectric strength;

Increased mechanical strength;

Greater thermal inductivity;

Superior protection against the ingress of water, chemical and containments.

A proper global vacuum pressure impregnated winding will have superior characteristics, which will support a longer and more maintenance free life span.

III Main illustrations and parameters

3.1 Vacuum-pressure impregnating tank system (2500 x 2500mm) vertical

3.1.1 Main parameters

3.1.2 Tank structure:

l Vertical type with inspection hole lamp and inspection window.

l Liquid level display

l Air inlet and safety valve.

l Temperature: Room temperature 80℃

l DN108 unloading mouth on the bottom

l Safety interlocking system, one set

l overpressure alarm and automatic decompression valve device, one set

3.2 Paint storage tank system

 Tank structure

l Vertical type with inspection hole lamp and inspection window.

l Liquid level display

l DN20 stainless steel ball valve on the sample outlet and inlet parts,

l Magnetism paint filter 200 mesh. 

 V.P.I. PROCESS EXPLAINED

1. Place stator or rotor inside impregnation vessel. 

2. Securely lock tank and initate vacuum process .

3. Once pressure is develped to 50mbar, the vacuum pump allows resin to enter impregnation vessel. 

4. Once the unit is submerged in resin, a wet vacuum is created. 

5. Upon completion of vacuum, the electrical apparatus is pressurised at 6 bar/84psi. 

6. VPI process duration is relative to the number of units of rotor/stator/coils and sizes.

7. Once the VPI process is completed , a reverse vacum is created in the resin tank to empty the impregnation vessel. 

8. The impregnation unit is then left to drip, pre-curing. 

9. A full printout of the process is generated including time, date, duration of process, pressure applied , etc. 

10. The information is stored in AIMS( avonmore information management system) 

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