Title :
Thermal-electric field distribution around a defect in polyethylene
Author :
Kuang, Jinbo ; Boggs, Steven A.
Author_Institution :
Dept. of Electr. Eng., Toronto Univ., Ont., Canada
fDate :
1/1/1998 12:00:00 AM
Abstract :
In the presence of a stress enhancement, a lightning surge causes space charge formation and power dissipation which can result in substantial temperature rises in dielectrics. Poisson´s equation and the thermal diffusion equation have been solved in 2D with field-dependent material parameters to compute temperature rises of over 80 K during a 100 ns risetime surge which produces a background field of 40 kV/mm applied to a 100 μm protrusion with a 0.5 μm tip radius. Such a temperature rise could play a major role in the lightning-induced conversion of water trees to electrical trees
Keywords :
electric breakdown; electric fields; polyethylene insulation; space charge; temperature distribution; thermal analysis; trees (electrical); 0.5 mum; 100 mum; 100 ns; 2D equations; Poisson´s equation; dielectrics; electrical trees; lightning surge; polyethylene insulation defects; power dissipation; space charge formation; stress enhancement; thermal diffusion equation; thermal-electric field distribution; water trees; Dielectric materials; Lightning; Poisson equations; Polyethylene; Power dissipation; Space charge; Surges; Temperature; Thermal stresses; Trees - insulation;
Journal_Title :
Power Delivery, IEEE Transactions on
