论文信息 - DC ageing of low density polyethylene insulation with protrusions at the electrodes

DC ageing of low density polyethylene insulation with protrusions at the electrodes

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%.

E. Ildstad | F. Oldervoll

[1] H. Kawamura,et al. DC electrical treeing phenomena and space charge , 1998 .

[2] J. H. Mason. Breakdown of Solid Dielectrics in Divergent Fields , 1955 .

[3] K. Stark,et al. Electric Strength of Irradiated Polythene , 1955, Nature.

[4] M. Ieda,et al. DC treeing breakdown associated with space charge formation in polyethylene , 1977, 1976 IEEE International Conference on Electrical Insulation.