What Is The Equipment Utilized In The Vacuum Drying Procedure Of Power Transformers |
Posted: May 23, 2020 |
The transformer gets placed in the vacuum drying oven for vacuum drying the insulation materials of the transformer. The vacuum drying oven has a vacuum system and a heating facility for developing low pressure in the chamber. It is important to heat the transformer to the right level at first. The insulation material needs to get uniformly heated, and the temperature has to be raised to the right point. The material is put to a vacuum after heating it. A vacuum system with vacuum pumps develops the vacuum in this oven. Because of the low pressure of the gas in the oven, the insulation releases the absorbed moisture. It gets extracted using the vacuum system. This system has a water condensation mechanism where the water vapor gets condensed and measured. Given below is the equipment needed to get this entire process completed. Vacuum Tight Chamber It is basically a rectangular chamber with the sized suited to place one transformer or multiple sets of it. The construction of this chamber in Vacuum Transformer Drying is rigid to withstand vacuum and heat. The chamber has a trolley for maneuvering the transformer out of and in the chamber. Heating Systems On the walls in the oven, there are tubes where a hot fluid gets flowing for transferring heat to the objects placed inside the oven. The fluid gets externally heated by a fuel/gas-fired boiler or by electrical heaters. The fan placed in the oven helps in the uniform distribution of temperature and acceleration of the heating of the insulation. Vacuum System The vacuum system has booster pumps, condensers, and vacuum pumps. The booster pumps and the vacuum pump evacuate the chambers to extract the gas or moisture from the chambers. The series of vacuum pumps have water-cooled condensers to help in the process of condensing the water vapor extracted from the insulation of the transformer. Controlling Mechanisms Thanks to the use of SCADA and PLC, the entire procedure of drying can get monitored and controlled to the required levels. You can also monitor and control the vacuum levels. The temperature levels of the vacuum drying oven can also get controlled. The time for drying, the amount of drying completed, and the end of the Vacuum Transformer Drying procedure can get monitored and determined. The amount of speed and accuracy that you get from this process is one of the reasons why this is so popular. The efficiency of this drying process depends on the temperature and its uniform distribution in the insulation material. The diffusion coefficient, which refers to the amount of water released by the material, is also an important factor in determining the efficiency of the process.
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