Title :
Space charge distribution in multilayer dielectrics
Author :
Hegerberg, R. ; Lillevik, O. ; Balog, G.
Author_Institution :
Norwegian Res. Inst. of Electr. Supply, Trondheim, Norway
fDate :
29 Oct-2 Nov 1989
Abstract :
Three-layer PP (polypropylene) film shows some unexpected dielectric behavior, possibly related to the existence of film-film interfaces in such systems. An experimental technique for studying the space charge distribution in multilayer structures has been developed. Depolarization currents and space charge distribution were measured in the model samples of 25-μm-thick biaxially stretched PP film. A record of the charge distribution after poling with 2 kV (corresponding to 27 MV/m) for 20 hours at 295 K is shown. The scan shows heterocharge at both electrodes, and the middle layer is also charged positively. There is a large variation parallel to the electrodes
Keywords :
dielectric depolarisation; dielectric thin films; organic insulating materials; polymer films; space charge; 2 kV; 20 h; 295 K; biaxially stretched; depolarisation currents; film-film interfaces; heterocharge; multilayer dielectrics; poling; space charge distribution; three layer polypropylene film; Charge measurement; Current measurement; Dielectrics and electrical insulation; Electrodes; Nonhomogeneous media; Oil insulation; Probes; Space charge; Temperature dependence; Voltage;
Conference_Titel :
Electrical Insulation and Dielectric Phenomena, 1989. Annual Report., Conference on
Conference_Location :
Leesburg, VA
DOI :
10.1109/CEIDP.1989.69581
