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The Progress of Study on High Burning Point Insulating Oil

With the increasing of the quantity of transformers, the fire- proof level of transformers is growing higher. However, the most usual insulating oil, mineral oil, has low burning point. Meanwhile, mineral oil also has environment and resource problems. A new kind of insulating oil that has higher burning point, and is environmental friendly and renewable to replace mineral oil is needed. This paper summarizes the progress of study on three kinds of high burning point insulating oil, which are silicon oil, vegetable oil and synthetic ester oil, and prospects the future research of high burning point of insulating oil.