Two-dimensional impurity distributions in “water trees” occurring in field aged HV cables

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Abstract

Two-dimensional mu-PIXE scans of sections through large (1 to 2 mm) vented “water trees”, found at the inner semicon-XLPE (cross-linked polyethylene) interface in underground HV cables, were made at 50 μm spacing with a proton energy of 1.0 MeV. The visual appearance of one tree is reproduced by the spatial distributions of the elements Na, Cl, K and Ca, while Si and S show only minor variation except for the change at the semicon-XLPE interface. A second sample with three adjacent trees shows little or no correlation between the visual trees and the impurity distributions, although a high spatial correlation between Na and Cl suggests the presence of NaCl in one of these three trees.

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Cited by (0)

1

On leave from John Abbott College, Ste Anne de Bellevue, Québec, Canada.

2

On leave from CEGEP André-Laurendeau, Montréal, Québec, Canada.

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