The structural characteristics of water trees in power cables and laboratory specimens

The physical structure of water trees grown in power cables and in laboratory specimens made of crosslinked polyethylene are studied and compared. Detailed observations are made by fluorescence microscopy. This technique, used for the first time in this type of research provides images with good contrast and high resolution. It is completed by 3-D views acquired by confocal laser scanning microscopy. In both cases the tree structure is a network of continuous submicroscopic branched and zigzag tracks. The previous published observations are critically examined. Moreover, the self-luminescence of water trees and its neighborhood is studied, and is shown to be localized in the tree tracks. >

[1]  R. Eichhorn,et al.  Method for Visualization of Water Trees by Staining , 1978, IEEE Transactions on Electrical Insulation.

[2]  E. F. Steennis,et al.  Water treeing in polyethylene cables , 1990 .

[3]  J. Koo,et al.  Some Observations on the Structure of Water Trees , 1984, IEEE Transactions on Electrical Insulation.

[4]  A. Bulinski,et al.  Etching and the Morphology of Cross-Linked Polyethylene Cable Insulation , 1983, IEEE Transactions on Electrical Insulation.

[5]  A. Garton,et al.  Ionic impurities in crosslinked polyethylene cable insulation , 1990 .

[6]  R. Eichhorn,et al.  Treeing in Solid Extruded Electrical Insulation , 1977, IEEE Transactions on Electrical Insulation.

[7]  L. Zlatkevich.  Luminescence techniques in solid-state polymer research , 1989 .

[8]  J. Smit,et al.  The chemical and physical composition of water trees in XLPE , 1991, [1991] Proceedings of the 3rd International Conference on Properties and Applications of Dielectric Materials.

[9]  J. Filippini,et al.  Some Aspects of the Relationship between Water Treeing, Morphology, and Microstructure of Pplymers , 1987, IEEE Transactions on Electrical Insulation.

[10]  J. Maas,et al.  Watertrees in polyethene studied by luminescence and FTIR microspectrometry , 1989, Proceedings of the 3rd International Conference on Conduction and Breakdown in Solid Dielectrics.

[11]  M. W. Reynolds,et al.  An investigation into water trees: Existence of channels and the influence of crosslinking , 1985, Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1985.

[12]  The validity of the mechanical damage theory of water treeing tested against experimental results , 1984, 1984 IEEE International Conference on Eletrical Insulation.

[13]  J. Smit,et al.  Water tree growth processes in XLPE , 1991, [1991] Proceedings of the 3rd International Conference on Properties and Applications of Dielectric Materials.

[15]  J. Filippini,et al.  Water treeing using the water needle method: the influence of the magnitude of the electric field at the needle tip , 1988 .

[16]  A. Bulinski,et al.  Properties of water treed and non-treed XLPE cable insulation , 1984, Conference on Electrical Insulation & Dielectric Phenomena - Annual Report 1984.

[17]  A. Bulinski,et al.  The Voltage Breakdown Characteristics of Miniature XLPE Cables Containing Water Trees , 1981, IEEE Transactions on Electrical Insulation.

[18]  P. Phillips,et al.  The Morphology of Cross-Linked Polyethylene Insulation , 1978, IEEE Transactions on Electrical Insulation.