Why purify transformer oil?
Maybe the first question should be, “why is it important to have purified oil in a transformer?” Dissolved gasses in transformer oil can cause arcing, corona discharges, and overheating--reducing the electrical efficiency and lifetime of the transformer. Likewise, water contamination at levels as low as 30 ppm (parts per million) can adversely affect the insulating strength of the oil. With ever-increasing standards for energy efficiency of power distribution transformers, the need to effectively degas will become even more important in the future. particles contamination will also affect the function of insulating oil. So we need to clean used transformer oil.
The ZYD series of degassifiers uses the only known method for reducing all three primary contaminants by treating the transformer oil; the thermo-vacuum process Transfomer oil is drawn in to the degassifier by means of low pressure created either by an inlet pump of a vacuum pump or combination or both. The oil is heated to reduce its viscosity and allow it flow through the rest of the system at a lower pressure. A magnetic strainer typically removes coarse particles larger than 20 microns This is the first stage required to remove the solid contamination The filtered oil is fed into a vacuum chamber where, due to the reduced pressure above the liquid, dissolved water is vaporised. The reduced pressure also facilitates the removal of any entrained gases in the oil
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