Title :
Space charge dynamics in LDPE films immediately before breakdown
Author :
Fukuma, M. ; Fukunaga, K. ; Maeno, T.
Author_Institution :
Matsue Nat. Coll. of Technol., Japan
fDate :
4/1/2001 12:00:00 AM
Abstract :
Space charge dynamics in low-density polyethylene (LDPE) films were observed by the pulsed electroacoustic (PEA) method during breakdown tests at various temperatures. In order to investigate the intrinsic electrical breakdown, the applied electric field was increased to 300 kV/mm in 150 ms, and kept constant until breakdown of the specimens, or 300 ms at the longest. Space charge profiles were measured at 1 ms intervals. A significant positive charge propagating into the sample was observed only immediately before the breakdown at 90°C. These measurements revealed that the positive charge behavior is strongly related to the breakdown phenomena
Keywords :
ageing; electric breakdown; polyethylene insulation; polymer films; space charge; 150 to 300 ms; 90 degC; LDPE films; applied electric field; breakdown tests; intrinsic electrical breakdown; low-density polyethylene; positive charge behavior; pulsed electroacoustic method; space charge dynamics; space charge profiles; Charge measurement; Current measurement; Electric breakdown; Plastic films; Polyethylene; Pulsed electroacoustic methods; Space charge; Temperature; Testing; Voltage;
Journal_Title :
Dielectrics and Electrical Insulation, IEEE Transactions on
