Title :
Relation between the ac loss current method and the PEA method for water-treed length
Author :
Ito, Noriyuki ; Ozaki, Tamon ; Sengoku, Is Sei ; Kawai, Jim ; Nakamura, Shuhei
Author_Institution :
Dept. of Electron., Mie Univ., Tsu, Japan
Abstract :
Change of ac loss current through a non-penetrated water-treed XLPE sheet sample with applied voltage has been studied based on a model. In the model, the conductance of the water-filled channel layer is assumed to exhibit a nonlinear dependence on voltage. The observed changes of the magnitude and phase of the fundamental current and the third harmonic component can be well fitted by the model. It is found that the length of the water-filled channel layer approaches that of the water-treed region estimated by the PEA method at 2 kV stress. It is also found that the length of the water-filled channel layer obtained by the ac loss current method has a good correlation with the length of the water-treed region estimated by the PEA method
Keywords :
XLPE insulation; acoustoelectric devices; dielectric losses; electric admittance; power cable insulation; pulse measurement; trees (electrical); 2 kV; AC loss current method; PEA method; XLPE insulated power cable; XLPE sheet sample; fundamental current; model; nonlinear voltage dependence; third harmonic component; water-filled channel layer conductance; water-treed length; Cable insulation; Cable shielding; Current measurement; Dielectric measurements; Dielectrics and electrical insulation; Polyethylene; Power cables; Power measurement; Trees - insulation; Voltage;
Conference_Titel :
Electrical Insulating Materials, 2001. (ISEIM 2001). Proceedings of 2001 International Symposium on
Conference_Location :
Himeji
Print_ISBN :
4-88686-053-2
DOI :
10.1109/ISEIM.2001.973718
