Title :
Electric field control by permittivity functionally graded materials and their lightning impulse withstand voltages for surface breakdown
Author :
Hayashi, Noriyuki ; Kawahara, Katsuki ; Sumikura, Misaki ; Hara, Masanori ; Endo, Fumihiro
Author_Institution :
Kyushu Univ., Kasuga, Japan
Abstract :
The authors have been probing the possibility of applying functionally graded materials to solid insulators in order to control the electric field profiles, and resultant improvement of insulation level. Investigated in the paper are the effects of the capacitive bulk-grading of the coaxial disc-type and post-type model spacers on the electric field along the insulator surface and on the corresponding surface breakdown voltage when the lightning impulse voltage is applied. It is obtained from the experimental work that the bulk-graded model spacers employed in the investigation stand for higher positive lightning impulse voltage by 10 to 25% than the ungraded model spacers, depending greatly on the manner of grading and model geometry.
Keywords :
electric fields; impulse testing; insulator testing; lightning; permittivity; surface discharges; bulk-graded model spacers; capacitive bulk-grading; coaxial disc type model spacers; corresponding surface breakdown voltage; electric field control; functionally graded materials; grading; insulation level improvement; insulator surface; lightning impulse voltage; lightning impulse withstand voltages; model geometry; permittivity functionally graded materials; positive lightning impulse voltage; post-type model spacers; solid insulators; surface breakdown; ungraded model spacers; Breakdown voltage; Coaxial components; Dielectric materials; Dielectrics and electrical insulation; Lighting control; Lightning; Permittivity; Solid modeling; Sulfur hexafluoride; Voltage control;
Conference_Titel :
Electrical Insulation, 2002. Conference Record of the 2002 IEEE International Symposium on
Print_ISBN :
0-7803-7337-5
DOI :
10.1109/ELINSL.2002.995927
