Application of insulating camellia oil in high fire resistance transformer

Insulating vegetable oils are environment-friendly and fire-resistant liquid dielectrics. This paper presented a new type of high fire resistance transformer filled with insulating camellia oil. The main physical, chemical and electrical properties of insulating camellia oil were measured and compared with those parameters of mineral oil. A new type of sealing camellia oil filled transformer was designed. The performances of camellia oil filled transformer were tested. The test results indicated good insulation performances of camellia oil filled transformer. The temperature rise of an ordinary transformer which was filled successively with insulating camellia oil and mineral oil were tested. The results showed that the temperature rise of insulating camellia oil filled transformer is slightly higher than that of mineral oil immersed transformer, suggesting that the oil gallery structure should be improved and the heat resistant grade of insulation paper should be enhanced.