Vacuum Drying Plants are used for drying transformers paper insulated winding, also Vacuum Drying plants is used for filling of insulated oil under vacuum. Vacuum Technique for Drying plant is famous for removing the moisture from the deep cavitations of windings paper.
Water in the active parts of the transformer can have adverse effect on its lifetime. The indicative lifetime of insulation at 80 C and 1% moisture is around 40 years whereas with 3% moisture it is 10 Years. Furthermore the reliability and overload capacity of the transformer are also affected when moisture is present. Transformers are more susceptible to mechanical stresses during short circuits when moisture is present. Vacuum Drying Plants uses hot air circulation to remove moisture from the insulation.
A common practice during the production or repair of power transformers is to remove moisture from paper insulation. The dried insulation has dielectric strength 20 times greater than not dried one, as moisture affects its dielectric breakdown.
Components of VDP :
- Vacuum Chamber
- Door
- Heating System
- Condensing System
- Vacuum Pumps
- Instrumentation and Controls.
Application of Vacuum Drying Plant :
- Power Transformers
- Distribution Transformers
- CT & PT Drying
- Capacitor Drying
- Bushing Drying