“The viscosity of insulating liquid is measured by timing the flow of a known volume of insulating liquid through a calibrated tube at a specific temperature. Viscosity has an important influence on the heat transfer characteristics of oil. High viscosity decreases the cooling efficiency of the oil. High viscosity will also affect the movement of parts in electrical equipment, such as circuit breakers, switchgear, tap changers, pumps, and regulators. Viscosity is a factor in determining the conditions for oil processing and cellulose impregnation time.”(Quote from IEEE C57.106-2015)
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“Many petroleum products, and some non-petroleum materials, are used as lubricants, and the correct operation of the equipment depends upon the appropriate viscosity of the liquid being used. In addition, the viscosity of many petroleum fuels is important for the estimation of optimum storage, handling, and operational conditions. Thus, the accurate determination of viscosity is essential to many product specifications.” (Quote from ASTM D445)