How can insulating oil be purified?
Purification can be achieved through the following methods:
① Filtration: Removes solid impurities such as fibers, carbon black, metal particles, other particulates, and sludge.
② Heating: Separates both dissolved and free moisture.
③ Vacuum treatment: Removes dissolved air and other gases.
What causes the electrical performance of insulating oil to decline during operation, and what remedial measures can be taken?
The electrical performance-or insulating capacity-of insulating oil is typically represented by its breakdown voltage and dielectric dissipation factor. Even trace amounts of moisture or impurities can lower the breakdown voltage; furthermore, suspended matter such as metal debris (from filters), fibers, dust, and carbon black also negatively affect the breakdown voltage. The aging of insulating oil-which produces acidic substances or sludge-as well as the contamination of the oil by water or other impurities, will increase the dielectric dissipation factor. Additionally, using unsuitable rubber or plastic hoses during the handling or transfer of the oil can lead to the oil dissolving components of these materials, causing the oil to deteriorate; in such cases, the dielectric dissipation factor may spike, sometimes reaching as high as 0.1.
When oil is found to have deteriorated-with its electrical performance declining to the point where it no longer meets operational standards-it can be regenerated. A common approach is to use a vacuum oil purification system (such as those from Tongrui) to treat the oil, followed by the addition of antioxidants, restoring its properties to meet the requirements for new oil.
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