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US 2022/0013249 A1Published application
Ultra high voltage direct current power cable system
AssigneeLs Cable & System Ltd.
InventorsSung Pyo HONG, Su Bong LEE, Eui Hwan JUNG, O Hyuck KWON, Seung Woo CHO, Sun Kak KIM
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Abstract
Provided is an ultra-high-voltage direct-current (DC) power cable system. Specifically, the present disclosure relates to an ultra-high-voltage DC power cable system capable of simultaneously preventing or minimizing electric field distortion, a reduction of DC dielectric strength, and a reduction of impulse breakdown strength due to the accumulation of space charges in an insulating layer of a cable and an insulating material of an intermediate connection part.
Claims21
An ultra-high-voltage direct current (DC) power cable system comprising:
- a pair of DC power cables each including a conductor formed by combining a plurality of wires, a cable inner semiconducting layer surrounding the conductor, a cable insulating layer, and a cable outer semiconducting layer, wherein ends of the pair of DC power cables in which the conductors, the cable inner semiconducting layers, the cable insulating layers, and the cable outer semiconducting layers are sequentially exposed are disposed to face each other;
- a connector connection part configured to electrically and mechanically connecting the conductors exposed at the ends of the pair of DC power cables;
- and
- an intermediate connection part surrounding the connector connection part and the ends of the pair of DC power cables in which the conductors, the cable inner semiconducting layers, the cable insulating layers, and the cable outer semiconducting layers are sequentially exposed,
- wherein the intermediate connection part comprises:
- an intermediate connection part inner semiconducting layer surrounding the connector connection part;
- an intermediate connection part insulating layer surrounding the intermediate connection part inner semiconducting layer;
- an intermediate connection part outer semiconducting layer surrounding the intermediate connection part insulating layer;
- and an intermediate connection part protective sheath layer surrounding the intermediate connection part outer semiconducting layer,
- the intermediate connection part insulating layer is formed of an insulating composition containing polyolefin resin and a crosslinking agent, and
- a thickness of the intermediate connection part insulating layer is divided into three equal parts including an inner layer, an intermediate layer, and an outer layer, wherein a total amount of each of acetophenone (AP) and α-methyl styrene (α-MS) among crosslinking by-products included in the inner layer, a total amount of each of acetophenone and α-MS among crosslinking by-products included in the intermediate layer, and a total amount of each of acetophenone and α-MS among crosslinking by-products included in the outer layer are 1,000 ppm or less.
8 more elements
9-10. (canceled)
An ultra-high-voltage direct current (DC) power cable system comprising:
- a pair of DC power cables each including a conductor formed by combining a plurality of wires, a cable inner semiconducting layer surrounding the conductor, a cable insulating layer, and a cable outer semiconducting layer, wherein ends of the pair of DC power cables in which the conductors, the cable inner semiconducting layers, the cable insulating layers, and the cable outer semiconducting layers are sequentially exposed are disposed to face each other;
- a conductor connection part configured to electrically and mechanically connecting the conductors exposed at the ends of the pair of DC power cables;
- and
- an intermediate connection part surrounding the connector connection part and the ends of the pair of DC power cables in which the conductors, the cable inner semiconducting layers, the cable insulating layers, and the cable outer semiconducting layers are sequentially exposed,
- wherein the intermediate connection part comprises:
- an intermediate connection part inner semiconducting layer surrounding the connector connection part;
- an intermediate connection part insulating layer surrounding the intermediate connection part inner semiconducting layer;
- an intermediate connection part outer semiconducting layer surrounding the intermediate connection part insulating layer;
- and an intermediate connection part protective sheath layer surrounding the intermediate connection part outer semiconducting layer,
- wherein the cable insulating layer is formed of an insulating composition containing polyolefin resin and a crosslinking agent, and
- a thickness of the cable insulating layer is divided into three equal parts including an inner layer, an intermediate layer, and an outer layer, wherein a total amount of each of acetophenone (AP) and α-methyl styrene (α-MS) among crosslinking by-products included in the inner layer, a total amount of each of acetophenone and α-MS among crosslinking by-products included in the intermediate layer, and a total amount of each of acetophenone and α-MS among crosslinking by-products included in the outer layer are 1,000 ppm or less.
8 more elements
Dependencies are inferred from the claim text.