AN EXPERIMENTAL STUDY ON VISCOSITY OF WATER SOLUBLE POLYMERS USED IN PRE COMPRESSED PRESSBOARDS INSULATION

Water soluble polymers are classified according to highly varied families of products of natural or synthetic origin and have several uses. Among these families, synthetic polymers are mainly used for bonding of boards and paper laminates which is used as an insulation for high voltage power transformers. The three main characteristics of water soluble polymers used in laminates are the molecular weight, concentration and internal structure. In general, the efficiency of the polymer will be greater if it posses longer molecular chain which inturn depend on their molecular weight. In addition to this, finding the viscosity of polymers is also a prime consideration for insulating purpose. Kinematic viscosity is a measure of the resistive flow of a fluid under the influence of gravity. In this paper experimental investigations have been carried out to measure the kinematic viscosity of synthetic polymer choosing different proportions of equal volume of insulations at 28o C, 40o C and 50o C. The insulating materials used for testing are polyvinyl alcohol (PVA), polyvinylpyrrolidone (PVP) and blending of both used in manufacturing of pre compressed press boards for high voltage power transformers.