摘要: Insulating liquids used in transformers, circuit breakers, and high-voltagebushings require proper testing and maintenance to keep them in good condition. Liquid insulation can be grouped into three broad categories, (a) mineral o... 展开 Insulating liquids used in transformers, circuit breakers, and high-voltagebushings require proper testing and maintenance to keep them in good condition. Liquid insulation can be grouped into three broad categories, (a) mineral oils derived from petroleum, (b) nonflammable, synthetic liquids containing PCB's (polychlorinated biphenyls) commonly called askarels, or any of many trade names for askarel, and (c) several new synthetic liquids being offered as a substitute for askarel. Gas-in-oil analysis of mineral oils can provide early detection of developing problems. Too frequently, the testing and purifying of liquid insulation is done without due regard to certain important precautions. The purpose of this chapter is to give a better understanding of the characteristics of insulating liquids and to establish uniform maintenance practices for tests and treatment. 收起