Title :
Smart insulation for tree resistance and surge absorption
Author :
Auckland, D.W. ; Su, Wenbin ; Varlow, B.R.
Author_Institution :
Sch. of Eng., Manchester Univ., UK
Abstract :
The electrical properties of polyester filled with ZnO, Al2 O3 or SiC have been investigated including electrical conduction, electrical tree growth and surge absorption. It was found that the J-V characteristics of the ZnO filled polyester are non-ohmic, exhibiting good insulation at low field and semi-conduction at high fields. The maximum safe current, the threshold strength and breakdown strength can be controlled by the concentration of ZnO. A sheet of ZnO filled polyester has been used as a barrier in polyester with point-plane electrodes. The tree growth is sensitive to the presence of the barrier; the tree growth time and breakdown time being significantly extended when barriers were used. The ZnO filled polyester also performed well as a surge absorber, successfully dissipating and absorbing transient currents, resulting from impulse voltage application
Keywords :
composite insulating materials; filled polymers; intelligent materials; organic insulating materials; surge protection; trees (electrical); Al2O3; SiC; ZnO; barrier; breakdown strength; electrical conduction; electrical tree resistance; filled polyester; impulse voltage; maximum safe current; nonohmic I-V characteristics; point-plane electrodes; semi-conduction; smart insulation; surge absorption; threshold strength; transient currents; Absorption; Conducting materials; Conductivity; Electric breakdown; Plastic insulation; Stress; Surges; Trees - insulation; Voltage; Zinc oxide;
Conference_Titel :
Electrical Insulation and Dielectric Phenomena, 1995. Annual Report., Conference on
Conference_Location :
Virginia Beach, VA
Print_ISBN :
0-7803-2931-7
DOI :
10.1109/CEIDP.1995.483576
