We present to your attention a transformer vacuum furnace UVS-6S, designed for drying the solid insulation of power transformers.

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.

Depending on the types of transformers there are several ways to remove moisture from the active part. One of them is drying with a vacuum furnace (vacuum oven).

Drying of power transformers with a vacuum furnaces has the following advantages:

• more intensive evaporation of moisture in comparison with drying with warm air or natural drying;
• optimal overall performance and reduced processing time.

GlobeCore offers a transformer vacuum furnace with modifications, adapted to meet specific needs of the customer. The design, accounts for productivity, dimensions, and placement location, loading method, degree of automation, etc.

The following picture shows a vacuum drying cabinet UVS-6S.

Transformer vacuum furnace: the main components and assemblies

1 – Control cabinet
2 – Vacuum unit BV-1000
3 – Compressor
4 – Oil heater PPM-18
5 – Vapor condenser
6 – Condensate collection tank
7 – Furnace chamber
8 – Door of the furnace chamber
9 – Sliding carriage

Drying of transformer insulation with a vacuum furnace UVS-6S is characterized by automated checkout and recording of important operating parameters: heating temperature, operating vacuum in the chamber, changes in moisture content of insulation, and condensate in the chamber. It is also possible to automatically record the listed parameters on the in the memory of the controller, to form a file with report and protocol.

Principle of operation

The active part of the transformer is loaded onto the sliding carriage by a travelling crane or a loader. The control of the carriage movement (motorized drive), closing and opening of the doors of the furnace chamber (pneumatic drive) is performed by an operator from the control cabinet.

To heating of the furnace chamber is done by technical oil, which, in turn, is brought to the required temperature by an oil flow through heater.

To protect the operating personnel from burns and to avoid the ambient air affecting the drying of transformer, the furnace chamber is made from stainless steel and insulated. The system also contains a condenser designed to convert steam from drying into moisture. The condenser is cooled by running water.

The control cabinet is located separately and contains:

• process controls;
• process detectors;
• protection system;
• system of diagnosing possible malfunctions.

The control system continually controls and monitors furnace status and operation, the vacuum unit parameters and the condition of treated solid insulation.

Remember that the price for a transformer vacuum furnace depends on the required dimensions, capacity, and technological features of the customer’s process.

Additional Features

Also, GlobeCore produces vacuum drying chambers for various raw materials:

• powders and pastes;
• food products;
• wood, etc.