“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)
What method is used to analyze the sample?
ASTM D88
ASTM D445
How do you interpret the results?
IEEE C57.106-2015
What do the results indicate?
“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)