Abstract
This research presents the evaluation of activated Bentonite material for treatment of used transformer oil. Different properties such as; electrical, physical, chemical and thermal of used transformer oil were meas-ured before and after purification and treatment. Two power transformers were used in this research (6.4: 4.6 MVA, 3 phases, 50 Hz). One of them was filled with purified oil and the other was filled with activated Bentonite treated oil after purification, and then the two power transformers were tested for one year under practical conditions of the operating field. Initial tests have indicated that the use of Activated BENTONITE in the treatment process for the aged transformer oil improved breakdown voltage, water content, total acidi-ty and flash point. Thus activated Bentonite gives an ideal treatment of aged transformer oil with its environmental and economic advantages. Moreover, activated Bentonite is available at many places in Egypt with low costs.
Highlights
Transformer oil plays very important roles in the power transformer as insulation and heat transfer medium, many researches and studies have been reported and examined for decades to understand its electrical, physical and molecular characteristics, behavior under certain condition such as high temperature, techniques to procure the best transformer oils, and so forth [1-3].Increasing awareness of the environment and the need to limit the impact of human activity gives a clear impetus to replace conventional insulating oils in high voltage plant with environmentally friendly alternatives
One of them was filled with purified oil and the other was filled with activated Bentonite treated oil after purification, and the two power transformers were tested for one year under practical conditions of the operating field
Initial tests have indicated that the use of Activated BENTONITE in the treatment process for the aged transformer oil improved breakdown voltage, water content, total acidity and flash point
Summary
Increasing awareness of the environment and the need to limit the impact of human activity gives a clear impetus to replace conventional insulating oils in high voltage plant with environmentally friendly alternatives. Oil leakage from equipment is a serious concern, both in terms of the clear up operation and equipment replacement costs. The insulation system in transformers can be improved, compared to mineral oil, using new high grade dielectric fluids like Envirotemp FR3 [4-6]. Oil immersed distribution transformers can be built with very low losses compared to dry-type transformers. This fact is well known because oil is a better cooling and insulation medium than air. The active part, core-and winding-design will be smaller in oil, i.e., lower material consumption and lower losses
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
