Abstract
Wet-design submarine cables rated up to 72,5 kV shall
undergo the Qualification of Wet Dielectrics according to
Cigre TB 722. This paper describes 66 kV XLPE cable
cores and tape-molded flexible factory joints which have
been subjected to 50 and 500 Hz wet ageing tests
according to this recommendation. The results show that
the breakdown voltage for the cable cores after completion
of wet ageing using different test regimes (50 Hz and
500 Hz) are not equivalent. An increase of the test voltage
to 3U0 accelerated the ageing process. Furthermore, it was
found that the wet-ageing performance is lower for the
taped factory joints than for the extruded cable cores.
KEYWORDS
66 kV, XLPE cables, wet design, wet-ageing, qualification
of wet dielectric, factory joints, tape-molded, extruded,
flexible, TB 722, material ageing, development tests,
guidelines, saturation, voids, test regimes, inter-array
undergo the Qualification of Wet Dielectrics according to
Cigre TB 722. This paper describes 66 kV XLPE cable
cores and tape-molded flexible factory joints which have
been subjected to 50 and 500 Hz wet ageing tests
according to this recommendation. The results show that
the breakdown voltage for the cable cores after completion
of wet ageing using different test regimes (50 Hz and
500 Hz) are not equivalent. An increase of the test voltage
to 3U0 accelerated the ageing process. Furthermore, it was
found that the wet-ageing performance is lower for the
taped factory joints than for the extruded cable cores.
KEYWORDS
66 kV, XLPE cables, wet design, wet-ageing, qualification
of wet dielectric, factory joints, tape-molded, extruded,
flexible, TB 722, material ageing, development tests,
guidelines, saturation, voids, test regimes, inter-array