| Mineral insulating oil has extensive application in high voltage electric equipments such as transformer, oil-filled cable and capacitor; it has excellent electric insulating property, high coolant capability and low cost. However, flash point of mineral insulating oil is always lower than 170℃and its biodegradable percent is only about 30%.It can't satisfy insulating material's high fireproof request and it also can't achieve the request of environmental protection. Flash point of vegetable insulating oil is higher than 300℃, it is a fire-resistant oil; its biodegradable percent is always larger than 97%, it will not pollute the water and inhabited area even though there is leakage. Therefore, research on the environment-friendly vegetable insulating oil with high flash point and high biodegradable percent has become a pop project.The research on using vegetable oil as dielectric liquid began at the same time as mineral oil. Because of its weak antioxygenic property and high freezing point, vegetable oil was restricted in capacitor impregnant. From 1990s, the output and quality of oil crops is improved by using gene techniques, and the reserves of mineral oil became decreased, the research of using vegetable oil as dielectric liquid have been developed again, vegetable oil could be the green substitute for mineral oil. In this paper, the domestic and overseas research situation of vegetable insulating oil was summarized and analyzed; from the three aspects of optimizing the refining process of vegetable insulating oil, antioxygenic property and electric property of camellia-seed insulating oil, basic property of camellia-seed insulating oil was researched, the advantage and disadvantage of camellia-seed oil for using as insulating oil was also researched, the primary content of my dissertation is shown below:(1)The difference of chemical structure between vegetable oil and mineral oil was dissertated and the impact of chemical structure on vegetable oil's antioxygenic property and freezing point was researched. The basic principle to choose crude vegetable oil was brought forward. The refining process of vegetable oil based on orthogonal experiment and current refining technology of oil was optimized. The basic chemical and physical index of camellia-seed oil and several types of different insulating oil was measured and their difference was compared.(2)The compact of electronic structure on camellia-seed oil's stability was dissertated and the oxidation mechanism of camellia-seed oil was discussed. The action mechanism of antioxidants was analyzed and the structure of several types of antioxidant was introduced. The inception oxidation temperature of vegetable insulating oil with different types of antioxidant was measured by pressure differential scanning calorimetry. The acid value and percent content of deposition of insulating oil after oxidation stability test was measured, the type of additive with best antioxygenic property to camellia-seed oil was chosen.(3)The primary electric property of camellia-seed oil was dissertated and the main factor which infects camellia-seed oil's electric property was researched. The electric property index of camellia-seed oil was tested by national standard and the difference between several types of insulating oil was compared. The impact of moisture and temperature on electric property of camellia-seed oil was researched and the impact of additive percent on electric property of camellia-seed insulating oil was analyzed.
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