Title :
Temperature distribution in a ZnO arrester subjected to multiple current impulses
Author :
Kuang, Jinbo ; Bennett, Jeffery A. ; Bommakant, Ram G. ; Boggs, Steven A.
Author_Institution :
Dept. of Electr. Eng., Toronto Univ., Ont., Canada
Abstract :
A finite element program for solution of coupled, transient, nonlinear field problems has been used to solve for the temperature distribution in ZnO arrester elements subjected to various current waveforms. Since the low field conductivity of ZnO is a strong function of both electric field and temperature, rapid changes in voltage can result in nonuniform heating which can cause local temperature rise, thermal run-away, and element failure. These effects are being investigated using a 2-D axisymmetric finite element program which solves for electric field and thermal field simultaneously for systems with temperature and/or electric field dependent conductivity, thermal conductivity, heat capacity, etc
Keywords :
arresters; electric fields; electrical conductivity; finite element analysis; temperature distribution; thermal conductivity; zinc compounds; 2-D axisymmetric finite element program; ZnO; ZnO arrester; current waveforms; electric field; electric field dependent conductivity; element failure; heat capacity; local temperature rise; low field conductivity; multiple current impulses; nonuniform heating; temperature distribution; thermal conductivity; thermal run-away; Arresters; Couplings; Finite element methods; Nonuniform electric fields; Resistance heating; Temperature dependence; Temperature distribution; Thermal conductivity; Voltage; Zinc oxide;
Conference_Titel :
Electrical Insulation, 1996., Conference Record of the 1996 IEEE International Symposium on
Conference_Location :
Montreal, Que.
Print_ISBN :
0-7803-3531-7
DOI :
10.1109/ELINSL.1996.549390
