Title :
A tentative tracking model based on energy balance criteria
Author :
Salama, M.M.A. ; Bartnikas, R. ; Sallam, M.M.
Author_Institution :
Dept. of Electr. & Comput. Eng., Waterloo Univ., Ont., Canada
fDate :
7/1/1998 12:00:00 AM
Abstract :
A tentative mathematical model is described for estimating the time required for tracking to occur in rotating wheel water-spray or dip tests on polymeric insulating materials. The model is based on the energy balance criterion. In the derivation of the model, the required time for tracking to occur is treated as a function of the geometrical dimensions, the thermal characteristics and the volume and surface conductivities of the specimen. It is also considered to be dependent upon the applied voltage, wheel speed as well as the time required for arcing to occur, the discharge activity and the number of dry bands formed upon the surface of the specimen. The validity of the model is assessed, using experimental data obtained with epoxy fibre glass composite specimens; reasonable agreement is found between the experimental results and the calculated values
Keywords :
arcs (electric); composite insulating materials; glass fibre reinforced plastics; insulation testing; organic insulating materials; polymers; surface conductivity; water; arcing; dip tests; discharge activity; dry bands; energy balance criteria; energy balance criterion; epoxy fibre glass composite specimens; geometrical dimensions; mathematical model; polymeric insulating materials; rotating wheel water-spray test; surface conductivity; thermal characteristics; tracking; volume conductivity; water later thickness; Conducting materials; Insulation life; Materials testing; Mathematical model; Plastic insulation; Polymers; Solid modeling; Surface discharges; Thermal conductivity; Wheels;
Journal_Title :
Power Delivery, IEEE Transactions on
