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
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
