US4132858A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Graded insulation cable construction, and method of overcoming stresses therein
Assignee: Vulkor Inc
•
Filing: 1977-03-28
•
Granted: 1979-01-02
•
Expires: 1997-03-28
Abstract
Abstract An electrical cable having an improved graded insulation which minimizes uneven electrical stresses caused therein by a lack of a symmetrical cable structure, and a method of overcoming disproportionate electrical stresses at interfaces intermediate the sections of a graded insulation for electrical cable.
Inventors
- 👤 Harry C. Anderson
- 👤 Burton T. MacKenzie, Jr.
- 👤 Maurice Prober
- 👤 Nirmal Singh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:17
CPC Classifications
H; H01; H01B; H01B9/00; H01B9/02; H01B9/027; H01B7/00; H01B7/02; H01B7/0291; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49194
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
165 words
An electrical cable for high voltage service having a multi-layered, graded insulation which minimizes uneven electrical stresses at the interface of insulation gradations, comprising an elongated metal electrical conductor enclosed within a surrounding composite body of polymeric insulation consisting of at least two distinct contiguous of polymeric insulation having different specific inductive capacitance values arranged about the electrical conductor with the innermost layer of polymeric insulation of the composite body of the insulation surrounding the electrical conductor having the highest specific inductive capacitance and each outwardly successive layer of polymeric insulation of the composite body of insulation having a progressively decreased specific inductive capacitance value, the specific inductive capacitance value of the innermost layer of polymeric insulation having the highest specific inductive capacitance surrounding the electrical conductor being about 3.2 to about 3.8 and the specific inductive capacitance value of the contiguous layer adjacent thereto being about 2.2 to about 3.0 and said specific inductive capacitance values being within a ratio of less than 1.4.
Claim 2
Dependent Claim
165 words
An electrical cable for high voltage service having a multi-layered, graded insulation which minimizes uneven electrical stresses at the interface of insulation gradations, comprising an elongated metal electrical conductor enclosed within a surrounding composite body of polymeric insulation consisting of at least two distinct contiguous of polymeric insulation having different specific inductive capacitance values arranged about the electrical conductor with the innermost layer of polymeric insulation of the composite body of the insulation surrounding the electrical conductor having the highest specific inductive capacitance and each outwardly successive layer of polymeric insulation of the composite body of insulation having a progressively decreased specific inductive capacitance value, the specific inductive capacitance value of the innermost layer of polymeric insulation having the highest specific inductive capacitance surrounding the electrical conductor being about 3.2 to about 3.8 and the specific inductive capacitance value of the contiguous layer adjacent thereto being about 2.2 to about 3.0 and said specific inductive capacitance values being within a ratio of less than 1.4.
Claim 3
Dependent Claim
39 words
The electrical calbe of claim 1, wherein the specific inductive capacitance values of the innermost layer and of the contiguous layer adjacent thereto of the composite body of insulation are within a ratio of about 1.2 to about 1.38.
Claim 4
Dependent Claim
163 words
An electrical cable for high voltage service having a multi-layered, graded insulation which minimizes uneven electrical stresses at the interface of insulation gradations, comprising an elongated metal electrical conductor enclosed within a surrounding composite body of polymeric insulation consisting of two distinct contiguous layers of polymeric insulation having different specific inductive capacitance values arranged about the electrical conductor with the innermost layer of polymeric insulation of the composite body of the insulation surrounding the electrical conductor having the highest specific inductive capacitance and the outwardly successive layer of polymeric insulation of the composite body of insulation having a decreased specific inductive capacitance value, the specific inductive capacitance value of the innermost layer of polymeric insulation having the highest specific inductive capacitance surrounding the electrical conductor being about 3.2 to about 3.8 and the specific inductive capacitance value of the contiguous layer adjacent thereto being about 2.2 to about 3.0 and said specific inductive capacitance values being within a ratio of less than 1.4.
Claim 5
Dependent Claim
163 words
An electrical cable for high voltage service having a multi-layered, graded insulation which minimizes uneven electrical stresses at the interface of insulation gradations, comprising an elongated metal electrical conductor enclosed within a surrounding composite body of polymeric insulation consisting of two distinct contiguous layers of polymeric insulation having different specific inductive capacitance values arranged about the electrical conductor with the innermost layer of polymeric insulation of the composite body of the insulation surrounding the electrical conductor having the highest specific inductive capacitance and the outwardly successive layer of polymeric insulation of the composite body of insulation having a decreased specific inductive capacitance value, the specific inductive capacitance value of the innermost layer of polymeric insulation having the highest specific inductive capacitance surrounding the electrical conductor being about 3.2 to about 3.8 and the specific inductive capacitance value of the contiguous layer adjacent thereto being about 2.2 to about 3.0 and said specific inductive capacitance values being within a ratio of less than 1.4.
Claim 6
Dependent Claim
39 words
The electrical cable of claim 3, wherein the specific inductive capacitance values of the innermost layer and of the contiguous layer adjacent thereto of the composite body of insulation are within a ratio of about 1.2 to about 1.38.
Claim 7
Dependent Claim
195 words
An electrical cable for high voltage service having a multi-layered, graded insulation which minimizes uneven electrical stresses at the interface of insulation gradations, comprising an elongated metal electrical conductor enclosed within a surrounding composite body of polymeric insulation of at least one ethylene-containing polymer selected from the group consisting of polyethylene, blends of polyethylene and other polymers, and copolymers of ethylene and other polymerizable materials, and consisting of at least two distinct contiguous layers of said polymeric insulation having different specific inductive capacitance values arranged about the electrical conductor with the innermost layer of polymeric insulation of the composite body of the insulation surrounding the electrical conductor having the highest specific inductive capacitance and each outwardly successive layer of polymeric insulation of the composite body of insulation having a progressively decreased specific inductive capacitance value, the specific inductive capacitance value of the innermost layer of polymeric insulation having the highest specific inductive capacitance surrounding the electrical conductor being about 3.2 to about 3.8 and the specific inductive capacitance value of the contiguous layer adjacent thereto being about 2.2 to about 3.0 and said specific inductive capacitance values being within a ratio of less than 1.4.
Claim 8
Dependent Claim
195 words
An electrical cable for high voltage service having a multi-layered, graded insulation which minimizes uneven electrical stresses at the interface of insulation gradations, comprising an elongated metal electrical conductor enclosed within a surrounding composite body of polymeric insulation of at least one ethylene-containing polymer selected from the group consisting of polyethylene, blends of polyethylene and other polymers, and copolymers of ethylene and other polymerizable materials, and consisting of at least two distinct contiguous layers of said polymeric insulation having different specific inductive capacitance values arranged about the electrical conductor with the innermost layer of polymeric insulation of the composite body of the insulation surrounding the electrical conductor having the highest specific inductive capacitance and each outwardly successive layer of polymeric insulation of the composite body of insulation having a progressively decreased specific inductive capacitance value, the specific inductive capacitance value of the innermost layer of polymeric insulation having the highest specific inductive capacitance surrounding the electrical conductor being about 3.2 to about 3.8 and the specific inductive capacitance value of the contiguous layer adjacent thereto being about 2.2 to about 3.0 and said specific inductive capacitance values being within a ratio of less than 1.4.
Claim 9
Dependent Claim
39 words
The electrical cable of claim 5, wherein the specific inductive capacitance values of the innermost layer and of the contiguous layer adjacent thereto of the composite body of insultion are within the ratio of about 1.2 to about 1.38.
Claim 10
Dependent Claim
194 words
An electrical cable for high voltage service having an multu-layered, graded insulation which minimizes uneven electrical stresses at the interface of insulation gradations, comprising an elongated metal electrical conductor endlosed within a surrounding composite body of cross-link cured polymeric insulation of at least one ethylene-containing polymer selected from the group consisting of polyethylene, blends of polyethylene and other polymers, and copolymers of ethylene and other polymerizable materials, consisting of two distinct contiguous layers of said cured polymeric insulation having different specific inductive capacitance values arranged about the electrical conductor with the innermost layer of polymeric insulation of the composite body of the cured insulation surrounding the electrical conductor having the highest specific inductive capacitance and the outwardly successive layer of polymeric insulation of the composite body of insulation having a decreased specific inductive capacitance value, the specific inductive capacitance value of the innermost layer of polymeric insulation having the highest specific inductive capacitance surrounding the electrical conductor being about 3.2 to about 3.8 and the specific inductive capacitance value of the contiguous layer adjacent thereto being about 2.2 to about 3.0 and said specific capacitance values being within a ratio of less then 1.4.
Claim 11
Dependent Claim
194 words
An electrical cable for high voltage service having an multu-layered, graded insulation which minimizes uneven electrical stresses at the interface of insulation gradations, comprising an elongated metal electrical conductor endlosed within a surrounding composite body of cross-link cured polymeric insulation of at least one ethylene-containing polymer selected from the group consisting of polyethylene, blends of polyethylene and other polymers, and copolymers of ethylene and other polymerizable materials, consisting of two distinct contiguous layers of said cured polymeric insulation having different specific inductive capacitance values arranged about the electrical conductor with the innermost layer of polymeric insulation of the composite body of the cured insulation surrounding the electrical conductor having the highest specific inductive capacitance and the outwardly successive layer of polymeric insulation of the composite body of insulation having a decreased specific inductive capacitance value, the specific inductive capacitance value of the innermost layer of polymeric insulation having the highest specific inductive capacitance surrounding the electrical conductor being about 3.2 to about 3.8 and the specific inductive capacitance value of the contiguous layer adjacent thereto being about 2.2 to about 3.0 and said specific capacitance values being within a ratio of less then 1.4.
Claim 12
Dependent Claim
39 words
The electrical cable of claim 7, wherein the specific inductive capacitance values of the innermost layer and of the contiguous layer adjacent thereto of the composite body of insulation are within a ratio of about 1.2 to about 1.38.
Claim 13
Dependent Claim
184 words
An electrical cable for high voltage electrical transmission service of at least about 69KV having a multi-layered, graded insulation which minimizes uneven electrical stresses at the interface of insulation gradiations, comprising an elongated metal electrical conductor enclosed within a surrounding composite body of cross-link cured polyethylene insulation consisting of at least two distinct contiguous layers of cured polyethylene insulation having different specific inductive capacitance values arranged about the electrical conductor with the innermost layer of polymeric insulation of the composite body of the polyethylene insulation surrounding the electrical conductor containing a filler and having the highest specific inductive capacitance and each outwardly successive layer of polymeric insulation of the composite body of insulation having a progressively decreased specific inductive capacitance value, the specific inductive capacitance value at the innermost filled layer of polymeric insulation having the highest specific inductive capacitance surrounding the electical conductor being about 3.2 to about 3.8 and the specific inductive capacitance value of the contiguous layer adjacent thereto being about 2.2 to about 3.0 and said specific inductive capacitance values being within a ratio of about 1.2 to about 1.38.
Claim 14
Dependent Claim
184 words
An electrical cable for high voltage electrical transmission service of at least about 69KV having a multi-layered, graded insulation which minimizes uneven electrical stresses at the interface of insulation gradiations, comprising an elongated metal electrical conductor enclosed within a surrounding composite body of cross-link cured polyethylene insulation consisting of at least two distinct contiguous layers of cured polyethylene insulation having different specific inductive capacitance values arranged about the electrical conductor with the innermost layer of polymeric insulation of the composite body of the polyethylene insulation surrounding the electrical conductor containing a filler and having the highest specific inductive capacitance and each outwardly successive layer of polymeric insulation of the composite body of insulation having a progressively decreased specific inductive capacitance value, the specific inductive capacitance value at the innermost filled layer of polymeric insulation having the highest specific inductive capacitance surrounding the electical conductor being about 3.2 to about 3.8 and the specific inductive capacitance value of the contiguous layer adjacent thereto being about 2.2 to about 3.0 and said specific inductive capacitance values being within a ratio of about 1.2 to about 1.38.
Claim 15
Dependent Claim
26 words
The electrical cable of claim 9, wherein the filler of the innermost layer having the highest specific inductive capacitance of the composite insulation is titanium dioxide.
Claim 16
Independent Claim
195 words
A method of overcoming the detrimental effects of uneven electrical stresses at the interface of multi-layered, graded insulation in electrical cable for high voltage service comprising providing an elongated metal electrical conductor enclosed wihin a surrounding composite body of polymeric insulation consisting of at least two distinct contiguous layers of polymeric insulation having different specific inductive capacitance values arranged about the electrical conductor with the innermost layer of polymeric insulation of the composite body of insulation surrounding the electrical conductor having the highest specific inductive capacitance and each outwardly successive layer of polymeric insulation of the composite body of insulation having a progressively decreased specific inductive capacitance value, wherein said uneven stresses are attributable to a lack of crosssectional concentricity of the layers of graded insulation, comprising the steps of producing said innermost layer of polymeric insulation having the highest specific inductive capacitance of the composite insulation surrounding the electrical conductor with a specific inductive capacitance value of about 3.2 to about 3.8 and the contiguous layer adjacent thereto with a specific inductive capacitance value of about 2.2 to about 3.0 and with said specific inductive capacitance values in a ratio of less than 1.4.
Claim 17
Independent Claim
195 words
A method of overcoming the detrimental effects of uneven electrical stresses at the interface of multi-layered, graded insulation in electrical cable for high voltage service comprising providing an elongated metal electrical conductor enclosed wihin a surrounding composite body of polymeric insulation consisting of at least two distinct contiguous layers of polymeric insulation having different specific inductive capacitance values arranged about the electrical conductor with the innermost layer of polymeric insulation of the composite body of insulation surrounding the electrical conductor having the highest specific inductive capacitance and each outwardly successive layer of polymeric insulation of the composite body of insulation having a progressively decreased specific inductive capacitance value, wherein said uneven stresses are attributable to a lack of crosssectional concentricity of the layers of graded insulation, comprising the steps of producing said innermost layer of polymeric insulation having the highest specific inductive capacitance of the composite insulation surrounding the electrical conductor with a specific inductive capacitance value of about 3.2 to about 3.8 and the contiguous layer adjacent thereto with a specific inductive capacitance value of about 2.2 to about 3.0 and with said specific inductive capacitance values in a ratio of less than 1.4.
Claim 18
Dependent Claim
36 words
The method of claim 11, wherein said innermost layer and the contiguous layer adjacent thereto at the composite polymeric insulation are produced with specific inductive capacitance values in a ratio of about 1.2 to about 1.38.
Claim 19
Independent Claim
186 words
A method of overcoming the detrimental effects of uneven electrical stresses at the interface of multi-layered, graded insulation in electrical cable for high voltage service comprising providing an elongated metal electrical conductor enclosed within a surrounding composite body of polymeric insulation consisting of two distinct contiguous layers of polymeric insulation having different specific inductive capacitance values arranged about the electrical conductor with the innermost layer of polymeric insulation having the highest specific inductive capacitance and the outwardly successive layer of polymeric insulation of the composite body of insulation surrounding the electrical conductor having a decreased specific inductive capacitance value, wherein said uneven stresses are attributable to a lack of cross-sectional concentricity of the layers of graded insulation, comprising the steps of producing said innermost layer of polymeric insulation having the highest specific inductive capacitance of the composite insulation surrounding the electrical conductor with a specific inductive capacitance value of about 3.2 to about 3.8 and the contiguous layer adjacent thereto with a specific inductive capacitance value of about 2.2 to about 3.0 and with said specific inductive capacitance values in a ratio of less than 1.4.
Claim 20
Independent Claim
186 words
A method of overcoming the detrimental effects of uneven electrical stresses at the interface of multi-layered, graded insulation in electrical cable for high voltage service comprising providing an elongated metal electrical conductor enclosed within a surrounding composite body of polymeric insulation consisting of two distinct contiguous layers of polymeric insulation having different specific inductive capacitance values arranged about the electrical conductor with the innermost layer of polymeric insulation having the highest specific inductive capacitance and the outwardly successive layer of polymeric insulation of the composite body of insulation surrounding the electrical conductor having a decreased specific inductive capacitance value, wherein said uneven stresses are attributable to a lack of cross-sectional concentricity of the layers of graded insulation, comprising the steps of producing said innermost layer of polymeric insulation having the highest specific inductive capacitance of the composite insulation surrounding the electrical conductor with a specific inductive capacitance value of about 3.2 to about 3.8 and the contiguous layer adjacent thereto with a specific inductive capacitance value of about 2.2 to about 3.0 and with said specific inductive capacitance values in a ratio of less than 1.4.
Claim 21
Dependent Claim
36 words
The method of claim 13, wherein said innermost layer and the contiguous layer adjacent thereto of the composite polymeric indulation are produced with specific inductive capacitance values in a ratio of about 1.2 to about 1.38.
Claim 22
Independent Claim
225 words
A method of overcoming the detrimental effects of uneven electrical stresses at the interface of multi-layered, graded insulation in electrical cable for high voltage service comprising providing an elongated metal electrical conductor enclosed within a surrounding composite body of polymeric insulation of at least one ethylene-containing polymer selected from the group consisting of polyethylene, blends of polyethylene and other polymers, and copolymers of ethylene and other polymerizable materials, and consisting of at least two distinct contiguous layers of said polymeric insulation having different specific inductive capacitance values arranged about the electrical conductor with the innermost layer of polymeric insulation of the composite body of the insulation surrounding the electrical conductor having the highest specific inductive capacitance and each outwardly successive layer of polymeric insulation of the composite body of insulation having a progressively decreased specific inductive capacitance value, wherein said uneven stresses are attributable to a lack of cross-sectional concentricity of the layers of graded insulations, comprising the steps of producing said innermost layer of polymeric insulation having the highest specific inductive capacitance of the composite insulation surrounding the electrical conductor with a specific inductive capacitance value of about 3.2 to about 3.8 and the contiguous layer adjacent thereto with a specific inductive capacitance value of about 2.2 to about 3.9 and with said specific inductive capacitance value in a ratio of less than 1.4.
Claim 23
Independent Claim
225 words
A method of overcoming the detrimental effects of uneven electrical stresses at the interface of multi-layered, graded insulation in electrical cable for high voltage service comprising providing an elongated metal electrical conductor enclosed within a surrounding composite body of polymeric insulation of at least one ethylene-containing polymer selected from the group consisting of polyethylene, blends of polyethylene and other polymers, and copolymers of ethylene and other polymerizable materials, and consisting of at least two distinct contiguous layers of said polymeric insulation having different specific inductive capacitance values arranged about the electrical conductor with the innermost layer of polymeric insulation of the composite body of the insulation surrounding the electrical conductor having the highest specific inductive capacitance and each outwardly successive layer of polymeric insulation of the composite body of insulation having a progressively decreased specific inductive capacitance value, wherein said uneven stresses are attributable to a lack of cross-sectional concentricity of the layers of graded insulations, comprising the steps of producing said innermost layer of polymeric insulation having the highest specific inductive capacitance of the composite insulation surrounding the electrical conductor with a specific inductive capacitance value of about 3.2 to about 3.8 and the contiguous layer adjacent thereto with a specific inductive capacitance value of about 2.2 to about 3.9 and with said specific inductive capacitance value in a ratio of less than 1.4.
Claim 24
Dependent Claim
36 words
The method of claim 15, wherein said innermost layer and the contiguous layer adjacent thereto of the composite polymeric insulation are produced with specific inductive capacitance values in a ratio of about 1.2 to about 1.38.
Claim 25
Independent Claim
219 words
A method of overcoming the detrimental effects of uneven electrical stresses at the interface of multi-layered, graded insulation in electrical cable for high voltage service comprising providing an elongated metal conductor enclosed within a surrounding composite body of polymeric insulation of at least one ethylenecontaining polymer selected from the group consisting of polyethylene, blends of polyethylene and other polmers, and copolymers of ethylene and other polymerizable materials, consisting of two distinct contiguous layers of said polymeric insulation having different specific inductive capacitance values arranged about the electrical conductor with the innermost layer of polymeric insulation of the composite body of insulation surrounding the electrical conductor having the highest specific inductive capacitance and the outwardly successive layer of polymeric insulation of the composite body of insulation having a decreased specific inductive capacitance value, wherein said uneven stresses are attributable to a lack of cross-sectional concentricity of the layers of graded insulation, comprising the steps of producing said innermost layer of polymeric insulation having the highest specific inductive capacitance of the composite insulation surrounding the electrical conductor with a specific inductive capacitance value of about 3.2 to about 3.8 and the contiguous layer adjacent thereto with a specific inductive capacitance value of about 2.2 to about 3.0 and with said specific inductive capacitance values in a ratio of less than 1.4.
Claim 26
Independent Claim
219 words
A method of overcoming the detrimental effects of uneven electrical stresses at the interface of multi-layered, graded insulation in electrical cable for high voltage service comprising providing an elongated metal conductor enclosed within a surrounding composite body of polymeric insulation of at least one ethylenecontaining polymer selected from the group consisting of polyethylene, blends of polyethylene and other polmers, and copolymers of ethylene and other polymerizable materials, consisting of two distinct contiguous layers of said polymeric insulation having different specific inductive capacitance values arranged about the electrical conductor with the innermost layer of polymeric insulation of the composite body of insulation surrounding the electrical conductor having the highest specific inductive capacitance and the outwardly successive layer of polymeric insulation of the composite body of insulation having a decreased specific inductive capacitance value, wherein said uneven stresses are attributable to a lack of cross-sectional concentricity of the layers of graded insulation, comprising the steps of producing said innermost layer of polymeric insulation having the highest specific inductive capacitance of the composite insulation surrounding the electrical conductor with a specific inductive capacitance value of about 3.2 to about 3.8 and the contiguous layer adjacent thereto with a specific inductive capacitance value of about 2.2 to about 3.0 and with said specific inductive capacitance values in a ratio of less than 1.4.
Claim 27
Dependent Claim
36 words
The method of claim 17, wherein said innermost layer and the contiguous layer adjacent thereto of the composite polymeric insulation are produced with specific inductive capacitance values in a ratio of about 1.2 to about 1.38.
Claim 28
Independent Claim
218 words
A method of overcoming the detrimental effects of uneven electrical stresses at the interface of multi-layered, graded insulation in electrical cable for high voltage electrical transmission service of at least about 69KV comprising providing an elongated metal conductor enclosed within a surrounding composite body of cross-link cured polyethylene insulation consisting of at least two distinct contiguous layers of cured polyethylene insulation having different specific inductive capacitance values arranged about the electrical conductor with the innermost layer of polymeric insulation of the composite body of the polyethylene insulation surrounding the electrical conductor containing a filler and having the highest specific inductive capacitance and each outwardly successive layer of polymeric insulation of the composite body of insulation having a progressively decreased specific inductive capacitance value, wherein said uneven stresses are attributable to a lack of cross-sectional concentricity of the layers of graded insulation, comprising the steps of producing said innermost layer of polymeric insulation having the highest specific inductive capacitance of the composite insulation surrounding the electrical conductor with a specific inductive capacitance value of about 3.2 to about 3.8 and the specific inductive capacitance value of the contiguous layer adjacent thereto with a specific inductive capacitance value of about 2.2 to about 3.0 and with said specific inductive capacitance values in a ratio of about 1.2 to about 1.38.
Claim 29
Independent Claim
218 words
A method of overcoming the detrimental effects of uneven electrical stresses at the interface of multi-layered, graded insulation in electrical cable for high voltage electrical transmission service of at least about 69KV comprising providing an elongated metal conductor enclosed within a surrounding composite body of cross-link cured polyethylene insulation consisting of at least two distinct contiguous layers of cured polyethylene insulation having different specific inductive capacitance values arranged about the electrical conductor with the innermost layer of polymeric insulation of the composite body of the polyethylene insulation surrounding the electrical conductor containing a filler and having the highest specific inductive capacitance and each outwardly successive layer of polymeric insulation of the composite body of insulation having a progressively decreased specific inductive capacitance value, wherein said uneven stresses are attributable to a lack of cross-sectional concentricity of the layers of graded insulation, comprising the steps of producing said innermost layer of polymeric insulation having the highest specific inductive capacitance of the composite insulation surrounding the electrical conductor with a specific inductive capacitance value of about 3.2 to about 3.8 and the specific inductive capacitance value of the contiguous layer adjacent thereto with a specific inductive capacitance value of about 2.2 to about 3.0 and with said specific inductive capacitance values in a ratio of about 1.2 to about 1.38.
Claim 30
Dependent Claim
25 words
The method of claim 19, wherein the filler of the innermost layer having the highest specific inductive capacitance of the composite insulation is titanium dioxide.
Claim 31
Dependent Claim
171 words
An electrical cable for high voltage electrical transmission service of at least about 69KV having a multi-layered, graded insulation, comprising an elongated metal electrical conductor enclosed within a surrounding composite body of polymeric insulation consisting of up to four distinct contiguous layers of polymeric insulation having different specific inductive capacitance values arranged about the electrical conductor with the innermost layer of polymeric insulation of the composite body of the insulation surrounding the electrical conductor having the highest specific inductive capacitance and each outwardly successive layer of polymeric insulation of the composite body of insulation having a progressively decreased specific inductive capacitance value, and wherein the specific inductive capacitance value of the innermost layer of polymeric insulation having the highest specific inductive capacitance of the polymeric insulation surrounding the electrical conductor is about 3.2 to about 3.8 and the specific inductive capacitance value of the contiguous relatively outward layer of polymeric insulation is about 2.2 to about 3.0, and said specific inductive capacitance values are in a ratio of less than 1.4.
Claim 32
Dependent Claim
171 words
An electrical cable for high voltage electrical transmission service of at least about 69KV having a multi-layered, graded insulation, comprising an elongated metal electrical conductor enclosed within a surrounding composite body of polymeric insulation consisting of up to four distinct contiguous layers of polymeric insulation having different specific inductive capacitance values arranged about the electrical conductor with the innermost layer of polymeric insulation of the composite body of the insulation surrounding the electrical conductor having the highest specific inductive capacitance and each outwardly successive layer of polymeric insulation of the composite body of insulation having a progressively decreased specific inductive capacitance value, and wherein the specific inductive capacitance value of the innermost layer of polymeric insulation having the highest specific inductive capacitance of the polymeric insulation surrounding the electrical conductor is about 3.2 to about 3.8 and the specific inductive capacitance value of the contiguous relatively outward layer of polymeric insulation is about 2.2 to about 3.0, and said specific inductive capacitance values are in a ratio of less than 1.4.
Claim 33
Dependent Claim
35 words
The electrical cable of claim 21, wherein the specific inductive capacitance values of the inner layer and of the contiguous relatively outward layer of insulation are within a ratio of about 1.2 to about 1.38.
Claim 34
Dependent Claim
172 words
An electrical cable for high voltage electrical transmission service of at least about 69KV having a multi-layered, graded insulation, comprising an elongated metal electrical conductor enclosed within a surrounding composite body of polymeric insulation consisting of up to three distinct contiguous layers of polymeric insulation having different specific inductive capacitance values arranged about the electrical conductor with the innermost layer of polymeric insulation of the composite body of the insulation surrounding the electrical conductors having the highest specific inductive capacitance and each outwardly successive layer of polymeric insulation of the composite body of insulation having a progressively decreased specific inductive capacitance value, and wherein the specific inductive capacitance value of the innermost layer of polymeric insulation having the highest specific inductive capacitance of the polymeric insulation surrounding the electrical conductor is about 3.2 to about 3.8 and the specific inductive capacitance value of the contiguous relatively outward layer is about 2.2 to about 3.0, and said specific inductive capacitance values of said contiguous layers are in a ratio of less than 1.4.
Claim 35
Dependent Claim
172 words
An electrical cable for high voltage electrical transmission service of at least about 69KV having a multi-layered, graded insulation, comprising an elongated metal electrical conductor enclosed within a surrounding composite body of polymeric insulation consisting of up to three distinct contiguous layers of polymeric insulation having different specific inductive capacitance values arranged about the electrical conductor with the innermost layer of polymeric insulation of the composite body of the insulation surrounding the electrical conductors having the highest specific inductive capacitance and each outwardly successive layer of polymeric insulation of the composite body of insulation having a progressively decreased specific inductive capacitance value, and wherein the specific inductive capacitance value of the innermost layer of polymeric insulation having the highest specific inductive capacitance of the polymeric insulation surrounding the electrical conductor is about 3.2 to about 3.8 and the specific inductive capacitance value of the contiguous relatively outward layer is about 2.2 to about 3.0, and said specific inductive capacitance values of said contiguous layers are in a ratio of less than 1.4.
Claim 36
Dependent Claim
35 words
The electrical cable of claim 23, wherein the specific inductive capacitance values of the inner layer and of the contiguous relatively outward layer of insulation are within a ratio of about 1.2 to about 1.38.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-01 | 1982-07-03 | 1983-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-01 | 1986-07-03 | 1987-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-01 | 1990-07-03 | 1991-01-02 | $7700.00 | Window Closed / Lapsed |