Multiple insulating layer high voltage wire insulation
AssigneeRockbestos Surprenant Cable Corp.
InventorTsu-Chia Shieh
Life of this patent
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Abstract
An electrical insulation composition comprising two or more crosslinked insulating layers wherein the layers comprise compatible polymer materials wherein crosslinking is present between the compatible layers to bond said layers together so that the crosslinked layers, when applied to a conductor, strip from said conductor without substantial separation. In addition, the crosslinked layers provide at least one of the following continuous service ratings when applied to 10 AWG or smaller conductor: i. greater than about 10 kV DC; ii. greater than about 5 kV AC.
Claims51
An electrical insulation article comprising two or more crosslinked insulating layers defining an inner and outer layer wherein said layers comprise polymer materials selected from the group consisting of a thermoplastic elastomer, a polyolefin polymer, poly(vinyl chloride), a silicone elastomer, chlorinated polyethylene, and a mixture thereof, wherein crosslinking is present between said layers to bond said layers together so that said crosslinked layers, when applied to a conductor, strip from said conductor without substantial separation, wherein a 2.0″ long sample of said bonded layers with said conductor removed cut at a thickness of about 50% into the outer layer subjected to a tensile test at a rate of about 20″/minute until rupture exhibits no separation between said bonded layers, and wherein said crosslinked layers provide, when applied to about 10 AWG or smaller conductor, at least one of the following continuous service ratings:
- i. greater than about 10 kV DC;
- and ii. greater than about 5 kV AC;
- and wherein at least one of said layers is flame retardant, characterized by a limiting oxygen index of about 21-100%.
An electrical insulation article for high voltage DC and AC leads, comprising two or more crosslinked insulating layers defining an inner and outer layer wherein said layers comprise polymer materials wherein crosslinking is present between said layers to bond said layers together so that said crosslinked layers, when applied to a conductor, strip from said conductor without substantial separation, wherein a 2.0″ long sample of said bonded layers with said conductor removed cut at a thickness of about 50% into the outer layer subjected to a tensile test at a rate of about 20″/minute until rupture exhibits no separation
- between said bonded layers, and wherein said bonded layers substantially prevent diffusion by air, moisture or electrolytes, and wherein said crosslinked layers, when applied to about 10 AWG or smaller conductor, provide at least one of the following continuous service ratings:
- i. greater than about 10 kV DC;
- and ii. greater than about 5 kV AC;
- and wherein one of said crosslinked layers is flame retardant, characterized by a limiting oxygen index greater than about 21% and the ability to pass a CSA FT1 or UL VW-1 vertical flame test, and wherein said layers are selected from the group consisting of a thermoplastic elastomer, a polyolefin polymer, poly(vinyl chloride), a silicone elastomer, chlorinated polyethylene, and a mixture thereof.
An insulated conductor wire comprising a conducting wire and surrounding insulation comprising two or more crosslinked insulating layers defining an inner and outer layer bonded together selected from the group consisting of a thermoplastic elastomer, a polyolefin polymer, poly(vinyl chloride), a silicone elastomer, chlorinated polyethylene, and a mixture thereof, wherein said surrounding crosslinked insulation provides, when applied to about 10 AWG or smaller conductor, at least one of the following continuous service ratings:
- i. greater than about 10 kV DC;
- and ii. greater than about 5 kV AC;
- and wherein said bonded layers strip from said conductor without substantial separation, and wherein a 2.0″ long sample of said bonded layers with said conductor removed cut at a thickness of about 50% into the outer layer subjected to a tensile test at a rate of about 20″/minute until rupture exhibits no separation between said bonded layers;
- and wherein at least one of said layers is flame retardant, characterized by a limiting oxygen index of about 21-100%.
An electrical insulation article comprising two or more crosslinked insulating layers defining an inner and outer layer wherein one of said layers comprises a HDPE/styrene-ethylene-butadiene-styrene blend and another of said layers comprises a HDPE/styrene-ethylene-butadiene-styrene/EPDM blend and wherein crosslinking is present between said layers to bond said layers together so that said crosslinked layers, when applied to a conductor, strip from said conductor without substantial separation, wherein a 2.0″ long sample of said bonded layers with said conductor removed cut at a thickness of about 50% into the outer layer subjected to a tensile test at a rate of about 20″/minute until rupture exhibits no separation between said bonded layers, and wherein said crosslinked layers provide, when applied to about 10 AWG or smaller conductor, at least on of the following continuous service ratings:
- i. greater than about 10 kV DC;
- and ii. greater than about 5 kV AC.
An electrical insulation article for high voltage DC and AC leads, comprising two or more crosslinked insulating layers defining an inner and outer layer wherein one of said layers comprises a HDPE/styrene-ethylene-butadiene-styrene blend, and another of said layers comprises a HDPE/styrene-ethylene-butadiene-styrene/EPDM blend, and wherein crosslinking is present between said layers to bond said layers together so that said crosslinked layers, when applied to a conductor, strip from said conductor without substantial separation, wherein a 2.0″ long sample of said bonded layers with said conductor removed cut at a thickness of about 50% into the outer layer subjected to a tensile test at a rate of about 20″/minute until rupture exhibits no separation between said bonded layers, and wherein said bonded layers substantially prevent diffusion by air, moisture or electrolytes, and wherein said crosslinked layers, when applied to about 10 AWG or smaller conductor, provide at least one of the following continuous service ratings:
- i. greater than about 10 kV DC;
- and ii. greater than about 5 kV AC;
- and wherein said crosslinked layers provide a limiting oxygen index greater than about 21% and the ability to pass a CSA FT1 or UL VW-1 vertical flame test.
An insulated conductor wire comprising a conducting wire and surrounding insulation comprising two or more crosslinked insulating layers defining an inner and outer layer bonded together wherein one of said layers comprises a HDPE/styrene-ethylene-butadienestyrene blend, and another of said layers comprises a HDPE/styrene-ethylene-butadienestyrene/EPDM blend, wherein said surrounding crosslinked insulation provides, when applied to about 10 AWG or smaller conductor, at least one of the following continuous service ratings:
- i. greater than about 10 kV DC;
- and ii. greater than about 5 kV AC;
- and wherein said bonded layers strip from said conductor without substantial separation, and wherein a 2.0″ long sample of said bonded layers with said conductor removed cut at a thickness of about 50% into the outer layer subjected to a tensile test at a rate of about 20″/minute until rupture exhibits no separation between said bonded layers.
Dependencies are inferred from the claim text.