

The TRANFOVIA Vapour Phase Drying Equipment is designed for insulation drying of ultra-high-voltage transformers, mutual inductors and capacitor bushings. A vapour-phase working medium provides high latent heat for uniform, thorough drying, while an external evaporator can support independent distillation and complete process records support production traceability.
This Vapour Phase Drying System is intended for manufacturers processing large high-voltage electrical products where the insulation system requires uniform, thorough drying. It is particularly aligned with ultra-high-voltage transformer production, mutual inductors and capacitor bushings. Buyers should select the system around product dimensions, drying-tank layout, evaporator and condenser power level, distillation arrangement and process-recording requirements.
Vapour is used as the heat-transfer medium, giving the process a high heat-carrying capability for transformer insulation drying.
The process is designed for uniform drying across the product, supporting shorter drying cycles and higher process efficiency.
The vapour phase itself has cleaning properties and can be used when secondary products require treatment.
An external evaporator enables independent distillation, separating this system from simpler hot-air vacuum drying arrangements.
The system records production process parameters for later review and traceability.
| Model | Evaporator | Main Condenser | Drying Tank |
| VPD-250 | 250 kW | 200 kW | Square horizontal; size customized |
| VPD-300 | 300 kW | 250 kW | Square horizontal; size customized |
| VPD-400 | 400 kW | 300 kW | Square horizontal; size customized |
| VPD-500 | 500 kW | 400 kW | Square horizontal; size customized |
| VPD-600 | 600 kW | 500 kW | Square horizontal; size customized |
The listed tank uses a square horizontal structure with a stated -0.1 to 0 MPa value; final tank dimensions are project-specific.
| Selection Point | Vapour Phase Drying | Vacuum Drying Equipment |
| Heating approach | Vapour working medium with high latent heat | Hot-air circulation; optional enhanced heating plates |
| Typical product focus | UHV transformers, mutual inductors, capacitor bushings | Oil-immersed transformers, capacitors, motors |
| Distinctive option | External evaporator for independent distillation | Optional micro-water measurement and terahertz heating plates |
| Choose when | A dedicated VPD process is required | A general transformer vacuum drying plant is required |
Choose vapour phase drying when the project requires vapour-phase heat transfer, independent distillation and a VPD power configuration matched to large high-voltage products. Choose the separate transformer vacuum drying system when the process is based on hot-air circulation, optional water-output monitoring or enhanced heating plates.
It is used for drying insulation systems in ultra-high-voltage transformers, mutual inductors and capacitor bushings using vapour as the working medium.
VPD uses a vapour-phase working medium and can include an external evaporator for independent distillation. The separate vacuum drying equipment uses hot-air circulation and optional moisture monitoring or enhanced heating plates.
The listed range includes VPD-250, VPD-300, VPD-400, VPD-500 and VPD-600, with evaporator power from 250 to 600 kW.
No. The tank is listed as a square horizontal structure and its size is customized to the customer project.
Provide product type, maximum dimensions, loading quantity, required cycle, preferred VPD power level, plant utilities, tank layout and traceability requirements.


