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STEM-EDS of Inception Sites of Vented Trees in a HV XLPE Subsea Cable

Abstract

High voltage XLPE cable cores have been subjected to wet
ageing following the recommendations in CIGRE TB 722.
The electrical ageing was performed at 500 Hz and 10
kV/mm. Vented water trees were detected initiating and
growing from the semi-conductive screens. The inception
sites of the trees were cut by cryo-microtomy and studied
using scanning transmission electron microscopy with
energy dispersive X-ray spectroscopy (STEM-EDS).
Inorganic impurities were detected on both sides of the
smooth XLPE-semiconductive screen interface close to the
inception site.
KEYWORDS
High voltage XLPE cables, Vented water trees, STEM-EDS, Inception site
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Category

Academic chapter

Language

English

Author(s)

Affiliation

  • SINTEF Industry / Materials and Nanotechnology
  • SINTEF Energy Research / Elkraftteknologi
  • Norwegian University of Science and Technology

Year

2023

Publisher

SEE

Book

Jicable'23 - 11th International Conference on Power Insulated Cables, Lyon - France 18-22 June 2023 : proceedings

ISBN

9782959042409

View this publication at Norwegian Research Information Repository