Title :
The influence of O2, N2 and H2O on space-charge accumulation in XLPE under DC fields
Author :
Lim, F.N. ; Fleming, R.J.
Author_Institution :
Dept. of Phys., Monash Univ., Clayton, Vic., Australia
Abstract :
The development of space-charge in XLPE insulation of power cables was investigated using the LIPP technique on samples 85 cm long. Exposing the samples to 130 kPa of dry O2 or dry N2 at 80°C for 24 hr had little effect on space-charge accumulation under a dc field. Exposure to a high humidity environment for 24 hr at 90°C caused an increase in space-charge density near the outer electrode and in the bulk. When the polarity of the applied voltage was reversed the equilibrium space-charge profile was very similar to that observed before reversal, but with opposite polarity. This suggests an apparent space-charge originating from an inhomogeneous concentration of partially aligned permanent molecular dipoles
Keywords :
XLPE insulation; limited space charge accumulation; 80 degC; 85 cm; 90 degC; DC fields; LIPP technique; XLPE; applied voltage polarity; high humidity environment; permanent molecular dipoles; power cables; space-charge accumulation; space-charge density; Amorphous materials; Anodes; Cable insulation; Cathodes; Conducting materials; Crystalline materials; Crystallization; Electrodes; Polyethylene; Pulse amplifiers;
Conference_Titel :
Electrical Insulating Materials, 1998. Proceedings of 1998 International Symposium on
Conference_Location :
Toyohashi
Print_ISBN :
4-88686-050-8
DOI :
10.1109/ISEIM.1998.741719
