Title :
Dielectric behavior of silicone and ester fluids for use in distribution transformers
Author_Institution :
Schering-Inst. for HV Eng. & HV Plants, Hannover Univ., Germany
fDate :
8/1/1991 12:00:00 AM
Abstract :
Investigations to determine the relevant electric and dielectric properties of certain insulating fluids which appeared most suitable from the viewpoint of environmental compatibility and inflammability are discussed. Two of these are silicone fluids based on linear polydimethyl siloxane (kinematic viscosity at 25°C is 50 mm2/s) and an ester fluid based on penthaerythrithol tetraester. After a short description of the insulating fluids, the influence of aging on the breakdown and dissipation factor is determined. Furthermore, a comparison of the breakdown and aging behavior of fluid-paper composite dielectrics is made. The influence of partial discharge prestressing on the breakdown of the fluid-paper composite dielectric is shown
Keywords :
ageing; dielectric properties of liquids and solutions; electric breakdown of liquids; electrical conductivity of liquids; insulating oils; partial discharges; power transformers; silicones; transformer insulation; aging; breakdown; dielectric properties; dissipation factor; distribution transformers; electric properties; environmental compatibility; ester; fluid-paper composite dielectrics; inflammability; insulating fluids; kinematic viscosity; linear polydimethyl siloxane; partial discharge prestressing; penthaerythrithol tetraester; silicone fluids; Aging; Circuit testing; Dielectric breakdown; Dielectric measurements; Dielectrics and electrical insulation; Electric breakdown; Fires; Power transformer insulation; Protection; Water storage;
Journal_Title :
Electrical Insulation, IEEE Transactions on
