Title :
Growth properties of sulfide trees in cables under dc stress
Author :
Anelli, P. ; Motori, A. ; Ghinello, I. ; Mazzanti, G. ; Montanari, G.C.
Author_Institution :
Pirelli Cavi SpA, Milano, Italy
fDate :
12/1/1997 12:00:00 AM
Abstract :
Investigations on the growth properties of sulfide tree in cable insulation, subjected to dc electric fields, are described in this paper. Measurements of electric strength and conductivity are correlated to tree growth, observed by optical and electron microscopy, during accelerated aging tests performed in sea water with hydrogen sulfide. It is shown that both electric strength and dc conductivity are very sensitive to the length and concentration of sulfide trees, and that the magnitude of the electric field affects tree shape and growth rate significantly
Keywords :
ageing; electric strength; electrical conductivity; electron microscopy; insulation testing; life testing; optical microscopy; polyethylene insulation; power cable insulation; power cables; submarine cables; trees (electrical); accelerated aging tests; conductivity; dc stress; electric field; electric strength; electron microscopy; optical microscopy; polyethylene cable insulation; submarine power cables; sulfide trees; tree growth rate; tree shape; Cable insulation; Conductivity measurement; Dielectrics and electrical insulation; Electric variables measurement; Electron optics; Optical microscopy; Optical sensors; Sea measurements; Stress; Trees - insulation;
Journal_Title :
Dielectrics and Electrical Insulation, IEEE Transactions on
