Water-tight rubber or plastic insulated cable

• US 5,095,175 A
• Filed: 04/24/1991
• Issued: 03/10/1992
• Est. Priority Date: 04/24/1990
• Status: Expired due to Fees

• Current Assignee: Hitachi Cable Limited (Proterial Ltd.)
• Original Assignee: Hitachi Cable Limited (Proterial Ltd.)
• Inventors: Yoshida, Fumio, Tanji, Tsutomu, Koishihara, Susumu, Isaka, Katsuyuki
• Primary Examiner(s): NIMMO, MORRIS
• Application Number:
  US07/690,853
• Time in Patent Office: 321 Days
• Field of Search: 174/23 R, 174/23 C, 174/120 SC, 174/126.1, 174/128.1
• US Class Current: 174/23.00R
• CPC Class Codes: H01B 7/285 by completely or partially filling interstices in the cable
• CPC Class Codes: Y02A 30/14 Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables

Abstract

A water-tight rubber or plastic insulated cable includes water-tight compound which is injected into apertures among stranded wires for a conductor. The stranded conductor is compressed to have a solidity factor of 85 to 95% of the conductor. The water-tight compound is injected into the apertures among the stranded wires except for an outermost surface of the conductor. The water-tight compound has a scorch time of more than 20 minutes under a temperature of 130° C. and includes conductive carbon of 50 to 60 weight %.

Claims

1. A water-tight rubber or plastic insulated cable, comprising:

a conductor consisting of stranded wires, said conductor being compressed to have a solidity factor of 85 to 95% of said conductor;

water-tight compound, injected into apertures among said stranded wires and not provided on an outermost surface of said conductor, which has a scorch time of more than 20 minutes under a temperature of 130°

C.;

an inner semi-conductive layer which is extruded on said conductor;

a rubber or plastic insulation layer which is extruded on said inner semiconductive layer; and

an outer semi-conductive layer which is extruded on said rubber or plastic insulation layer.

2. A water-tight rubber or plastic insulated cable, comprising:

a conductor consisting of stranded wires, said conductor being compressed to have a solidity factor of 85 to 95% of said conductor;

water-tight compound, injected with apertures among said stranded wires and not provided on an outermost surface of said conductor, which comprises conductive carbon of 50 to 60 weight %;

an inner semiconductive layer which is extruded on said conductor;

a rubber or plastic insulation layer which is extruded on said inner semiconductive layer; and

an outer semiconductive layer which is extruded on said rubber or plastic insulation layer.

3. A water-tight rubber or plastic insulated cable, comprising:

a conductor consisting of stranded wires, said conductor being compressed to have a solidity factor of 85 to 95% of said conductor;

a water-tight compound, injected into apertures among said stranded wires and not provided on an outermost surface of said conductor, which has a scorch time of more than 20 minutes under a temperature of 130°

C. and comprises conductive carbon of 50 to 60 weight %;

an inner semiconductive layer which is extruded on said conductor;

a rubber or plastic insulation layer which is extruded on said inner semiconductive layer; and

an outer semiconductive layer which is extruded on said rubber or plastic insulation layer.