Title :
Electric field control by polymer foam
Author :
Fromm, Udo ; Ming, Li ; Schutte, T. ; Walfridsson, Lars ; Kron, Anna ; Liu, Rongsheng ; Windmar, Dan
Author_Institution :
ABB Corp. Res., Vasteras, Sweden
Abstract :
For an improved design of high voltage apparatus a material with a low dielectric constant and a relatively high breakdown strength is advantageous. Therefore the insulating properties of polymer foam with closed pores are investigated. It was found, that for a foam with closed gas filled spheres the breakdown voltage is close to the partial discharge inception voltage and it depends on the void size and the degree of foaming. For practical applications a void diameter lower than 50 μm in combination with a high gas content is desirable. The tested foam had a breakdown strength of 6 kV/mm and a relative dielectric constant of 1.1. Using this material a decrease of 30% of the size of high voltage electrodes can be achieved
Keywords :
electric breakdown; electric strength; foams; organic insulating materials; partial discharges; permittivity; polymers; porous materials; voids (solid); breakdown strength; closed pores; dielectric constant; electric field control; gas filled spheres; high voltage electrode; insulating properties; partial discharge; polymer foam; voids; Breakdown voltage; Dielectric breakdown; Dielectric constant; Dielectric materials; Dielectrics and electrical insulation; Electrodes; Partial discharges; Plastic insulation; Polymer foams; Testing;
Conference_Titel :
Conduction and Breakdown in Solid Dielectrics, 1998. ICSD '98. Proceedings of the 1998 IEEE 6th International Conference on
Conference_Location :
Vasteras
Print_ISBN :
0-7803-4237-2
DOI :
10.1109/ICSD.1998.709324
