Title :
Characteristics of space charge formed in a laminated LDPE/EVA dielectric under DC stress
Author :
Tanaka, Toshikatsu ; Kisanuki, Osamu ; Sakata, Masataka ; Uchiumi, Michihiro
Author_Institution :
Dept. of Energy Conversion, Kyushu Univ., Fukuoka, Japan
Abstract :
A laser-induced pressure pulse (LIPP) method was used for measuring the space charge distribution of LDPE/EVA laminate dielectrics under DC stress. A constant voltage up to ±20 kV was applied to a side of laminates of 0.5 mm thickness for 30 minutes. The other side is grounded. When the amount of space charge was measured by LIPP, both sides were virtually grounded. Space charge built up in or near the interface between LDPE and EVA was mainly investigated. Positive and negative voltage was applied to the side of LDPE in the laminates. It was clarified that the space charge was larger in case of LDPE negatively biased than in case of LDPE positively biased. The density of the space charge ranged around 1 nC/mm3. The formation of interfacial space charge is analyzed
Keywords :
polyethylene insulation; DC stress; electrical insulation tests; interfacial space charge; laminated LDPE/EVA dielectric; laser-induced pressure pulse method; space charge characteristics; space charge density; Charge measurement; Current measurement; Dielectric measurements; Laminates; Optical pulses; Pressure measurement; Pulse measurements; Space charge; Stress measurement; Voltage;
Conference_Titel :
Electrical Insulation, 1996., Conference Record of the 1996 IEEE International Symposium on
Conference_Location :
Montreal, Que.
Print_ISBN :
0-7803-3531-7
DOI :
10.1109/ELINSL.1996.549313
