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US 12,640,284 B2Granted
Marine cable for offshore wind power having an improved water-tree property
AssigneeLs Cable & System Ltd.
InventorsHyun Jung Jung, Gi Joon Nam, Kyoung Soo Kim, Yi Seul Yang
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Abstract
A marine cable may be provided with at least one core including a conductor and an insulating layer that surrounds the conductor, such that sizes of water trees, caused by diffusion of moisture, in the insulating layer are controlled.
Claims9
A marine cable for offshore wind power, comprising:
- at least one core comprising a conductor;
- an inner semiconductive layer configured to surround the conductor;
- an insulating layer configured to surround the inner semiconductive layer;
- an outer semiconductive layer configured to surround the insulating layer;
- a wire shield layer configured to surround the outer semiconductive layer;
- and
- a core jacket configured to surround the wire shield layer,
- wherein the insulating layer comprises crosslinked polyethylene (XLPE) and has a breakdown voltage (BDV) equal to or greater than 80 kilovolts per millimeter (kV/mm),
- wherein sizes of water trees in the insulating layer, measured based on standard American Society for Testing and Materials (ASTM) D6097, are equal to or less than 850 micrometers (μm),
- wherein a degree of crosslinking of the insulating layer is equal to or greater than 77%, and
- wherein a degree of crystallinity of the insulating layer is from 35% to 36%, and
- wherein an Alternating Current (AC) dielectric breakdown of the marine cable, which is aged based on test Regime B of standard CIGRE TB722 by soaking the marine cable in a 3.5% Sodium Chloride (NaCl) solution and applying a frequency of 500 Hertz (Hz) and voltage of 5.5 kV/mm for a time period of at least 3,000 hours, does not occur within 72 hours of the time period after aging.
9 more elements
A marine cable for offshore wind power, comprising:
- a core, comprising a conductor;
- an inner semiconductive layer, which surrounds the conductor;
- an insulating layer, which surrounds the inner semiconductive layer and comprises crosslinked polyethylene (XLPE), has a breakdown voltage (BVD) greater than or equal to 80 kilovolts per millimeter (kV/mm), has a degree of crosslinking greater than or equal to 77%, and has a degree of crystallinity between 35% and 36%;
- an outer semiconductive layer that surrounds the insulating layer;
- a wire shield that surrounds the outer semiconductive layer;
- and
- a core jacket that surrounds the wire shield,
- wherein sizes of water trees in the insulating layer, measured based on standard ASTM D6097, are less than or equal to 850 micrometers (μm).
5 more elements
Dependencies are inferred from the claim text.