Cross-linked polyethylene-insulated cable

• US 4,894,284 A
• Filed: 11/08/1983
• Issued: 01/16/1990
• Est. Priority Date: 11/09/1982
• Status: Expired due to Fees

• Current Assignee: Sumitomo Electric Industries Limited (Sumitomo Corporation)
• Original Assignee: Sumitomo Electric Industries Limited (Sumitomo Corporation)
• Inventors: Kondo, Masaaki, Inoue, Yoshiyuki, Yamanouchi, Shosuke
• Primary Examiner(s): Lesmes, George F.
• Assistant Examiner(s): NOT, DEFINED
• Application Number:
  US06/549,843
• Time in Patent Office: 2,261 Days
• Field of Search: 174/105 SC, 174/110 PM, 174/120 SC, 174/102 SC, 428/36
• US Class Current: 428/378
• CPC Class Codes: C08K 5/14 Peroxides
• CPC Class Codes: C08L 23/06 Polyethene
• CPC Class Codes: H01B 3/441 from alkenes
• CPC Class Codes: H01B 9/027 composed of semi-conducting layers
• CPC Class Codes: Y02A 30/14 Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables
• CPC Class Codes: Y10S 174/13 High voltage cable, e.g. above 10kv, corona prevention
• CPC Class Codes: Y10T 428/2913 Rod, strand, filament or fiber
• CPC Class Codes: Y10T 428/2933 Coated or with bond, impregnation or core
• CPC Class Codes: Y10T 428/2938 Coating on discrete and individual rods, strands or filaments
• CPC Class Codes: Y10T 428/2942 Plural coatings

Abstract

A cable insulated with a cross-linked polyethylene layer is described, wherein the cross-linked polyethylene is prepared by cross-linking with 2,5-dimethyl-2-5-di(tert-butylperoxy)hexane or 2,5-dimethyl-2,5-di(tert-butylperoxy)hexyne-3 as a cross-linking agent. Even if voltage is applied at high temperatures, the breakdown voltage of the cable can be maintained at a high level.

Claims

1. A cross-linked polyethylene-insulated cable comprising a conductor core, an inner semiconductive layer, an outer semiconductive layer and an insulating layer between said inner semiconductive layer and said outer semiconductive layer, wherein the insulating layer has a thickness of at least 6 mm and is made of a cross-linked polyethylene prepared by a dry cross-linking method with 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane or 2,5-dimethyl-2,5-di(tert-butylperoxy)hexyne-3 as a cross-linking agent.

2. A cross-linked polyethylene-insulated cable as claimed in claim 1, wherein the cross-linking of the polyethylene is performed by dry cross-linking using infrared radiation.

3. A cross-linked polyethylene-insulated cable as claimed in claim 1, wherein the cross-linking of the polyethylene is performed by dry cross-linking using a hot silicone oil bath.

4. A cross-linked polyethylene-insulated cable as claimed in claim 1, wherein the cross-linking of the polyethylene is performed by dry cross-linking using hot inert gas.

5. A cross-linked polyethylene-insulated cable as claimed in claim 1, wherein the cross-linking of the polyethylene is performed by dry cross-linking using a long die.

6. A cross-linked polyethylene-insulated cable as claimed in claim 1, wherein a water-shielding layer, comprising a metal layer laminated with a water-shielding material, is provided around the insulating layer.