Insulating liquid plays an important role for the life span of the transformer.Petroleum-based mineral oil has become dominant insulating liquid of transformer for more than a century for its excellent dielectric and ...Insulating liquid plays an important role for the life span of the transformer.Petroleum-based mineral oil has become dominant insulating liquid of transformer for more than a century for its excellent dielectric and cooling properties.However,the usage of petroleum-based mineral oil,derived from a nonrenewable energy source,has affected the environment for its nonbiodegradability property.Therefore,researchers direct their attention to renewable and biodegradable alternatives.Palm fatty acid ester,coconut oil,sunflower oil,etc.are considered as alternatives to replace mineral oil as transformer insulation liquid.This paper gives an extensive review of different liquid insulating materials used in a transformer.Characterization of different liquids as an insulating material has been discussed.An attempt has been made to classify different insulating liquids-based on different properties.展开更多
采用在真空夹层中充注纯度不高的一般工业用 CO2 的方法 ,来研究不同充注压力及不同绝热层材料下低温输送管路中的 CO2 冷凝真空绝热问题 ;分析了 CO2 纯度对绝热层真空度的影响。测量并计算了管路内充满液氮后真空绝热层的真空度、真...采用在真空夹层中充注纯度不高的一般工业用 CO2 的方法 ,来研究不同充注压力及不同绝热层材料下低温输送管路中的 CO2 冷凝真空绝热问题 ;分析了 CO2 纯度对绝热层真空度的影响。测量并计算了管路内充满液氮后真空绝热层的真空度、真空绝热层外壁壁温和绝热层的表观导热率。结果表明 ,在低真空绝热夹层中充注工业用 CO2 后 ,得到的真空绝热层绝热效果良好 ,能够满足一般的低温输送管路需求。展开更多
文摘Insulating liquid plays an important role for the life span of the transformer.Petroleum-based mineral oil has become dominant insulating liquid of transformer for more than a century for its excellent dielectric and cooling properties.However,the usage of petroleum-based mineral oil,derived from a nonrenewable energy source,has affected the environment for its nonbiodegradability property.Therefore,researchers direct their attention to renewable and biodegradable alternatives.Palm fatty acid ester,coconut oil,sunflower oil,etc.are considered as alternatives to replace mineral oil as transformer insulation liquid.This paper gives an extensive review of different liquid insulating materials used in a transformer.Characterization of different liquids as an insulating material has been discussed.An attempt has been made to classify different insulating liquids-based on different properties.
文摘采用在真空夹层中充注纯度不高的一般工业用 CO2 的方法 ,来研究不同充注压力及不同绝热层材料下低温输送管路中的 CO2 冷凝真空绝热问题 ;分析了 CO2 纯度对绝热层真空度的影响。测量并计算了管路内充满液氮后真空绝热层的真空度、真空绝热层外壁壁温和绝热层的表观导热率。结果表明 ,在低真空绝热夹层中充注工业用 CO2 后 ,得到的真空绝热层绝热效果良好 ,能够满足一般的低温输送管路需求。
