Title :
DC ageing of low density polyethylene insulation with protrusions at the electrodes
Author :
Oldervoll, Froydis ; Ildstad, Erling
Author_Institution :
Dept. of Electr. Power Eng., NTNU, Trondheim, Norway
fDate :
6/23/1905 12:00:00 AM
Abstract :
The ageing process in a polymeric insulation under HVDC conditions may be accelerated in the presence of protrusions. In this work low density polyethylene insulation with needle-shaped electrodes was subjected to electrical and thermal ageing. The polarity of the applied DC field was either kept constant or reversed every 5 minute. After 4 weeks ageing with constant polarity the DC breakdown level was unaltered or even improved. Ageing with polarity reversals reduced the DC breakdown level of LDPE with antioxidant by 25%
Keywords :
ageing; electric breakdown; polyethylene insulation; space charge; DC ageing; antioxidant; electrical ageing; low density polyethylene insulation; needle-shaped electrodes; polarity; protrusions; thermal ageing; Aging; Cables; Circuit testing; Electric breakdown; Electrodes; Insulation; Needles; Polyethylene; Temperature; Voltage;
Conference_Titel :
Solid Dielectrics, 2001. ICSD '01. Proceedings of the 2001 IEEE 7th International Conference on
Conference_Location :
Eindhoven
Print_ISBN :
0-7803-6352-3
DOI :
10.1109/ICSD.2001.955692
