Natural ester — Moisture and acidity issue

Electrical insulating system is an important part of the electrical equipment. In the case of high voltage transformers, their electrical insulating system is composed of insulating oil and paper, the quality of used insulating fluid is a decisive factor for the service life and reliability of the transformer. The transformer oil is also a carrier of information of the state of the transformer because the degradation influences (temperature, solid contaminants, etc.) are during operation causing aging of the insulating oil. The aging of transformer oil leads to deterioration of the quality of oil that the oil must be replaced with new or regenerated oil. Given the current emphasis on environmental protection and economical operation, it is recommended the refining of oil before its replacement with a new one. This article deals with the refining of natural rapeseed oil through the adsorbent. The refining of rapeseed oil removes acidic substances and improves the acid number and its properties.