The present disclosure relates to a direct-current power cable system capable of alleviating an electric field in a portion where space charges excessively accumulate inside a sleeve member of an ultra-high voltage direct-current power cable system, thereby preventing or minimizing electric field distortion and insulation breakdown of a cable joint box due to local electric field concentration.

A capacitive power transmission cable, having at least two sets of conductive strands, the sets of strands being insulated from each other and in capacitive relationship, the one with the other: wherein the conductive strands are laid at least substantially in a multiples of six layer structure, with substantially equal numbers of strands of both sets; each layer has strands of one set alternating with strands of the other set; and the strands of the respective sets have different contrasting color.

A capacitive power transmission cable, having at least two sets of conductive strands, the sets of strands being insulated from each other and in capacitive relationship, the one with the other: wherein the conductive strands are laid at least substantially in a multiples of six layer structure, with substantially equal numbers of strands of both sets; each layer has strands of one set alternating with strands of the other set; and the strands of the respective sets have different contrasting color.

The present disclosure relates to a submarine cable in which cross-wound directions and cross-wound pitches of a metal wire and a shielding member surrounding an outer side of the metal wire that constitute a metal shielding layer of the submarine cable are optimized to minimize damage to the metal shielding layer, to enable rapid energization in the event of an accidental current, and further to enhance flexibility by varying the cross-wound pitch of at least one of the metal wire and the shielding member that constitute the metal shielding layer according to an environment in which the submarine cable is laid.

The present disclosure relates to a submarine cable in which cross-wound directions and cross-wound pitches of a metal wire and a shielding member surrounding an outer side of the metal wire that constitute a metal shielding layer of the submarine cable are optimized to minimize damage to the metal shielding layer, to enable rapid energization in the event of an accidental current, and further to enhance flexibility by varying the cross-wound pitch of at least one of the metal wire and the shielding member that constitute the metal shielding layer according to an environment in which the submarine cable is laid.

The present disclosure relates to a coaxial cable for nuclear power plants, and more specifically, relates to a coaxial cable for nuclear power plants, which includes an inner conductor arranged at a center of a cable, an insulating layer arranged in a form of surrounding an outer periphery of the inner conductor, and formed of a foaming material forming many porous cells, and a sheath layer arranged in a form of surrounding an outer periphery of the insulating layer. Activation energy of the insulating layer is within a range of 2.06 eV to 2.84 eV. Accordingly, it is possible to provide the coaxial cable for nuclear power plants which can maintain a certain level of performance even after the elapse of a specified lifespan.

A conductor for conducting electric current has along its length at least two main sections comprising at least a first main section and a second main section and at least one transposing junction connecting adjacent ones of the main sections The conductor comprises several partial conductors comprising at least a first partial conductor and a second partial conductor wherein in the first main section the first partial conductor has an outer diameter which is larger than an outer diameter of the second partial conductor and, in the second main section the second partial conductor has an outer diameter which is larger than an outer diameter of the first partial conductor.

A conductor for conducting electric current has along its length at least two main sections comprising at least a first main section and a second main section and at least one transposing junction connecting adjacent ones of the main sections The conductor comprises several partial conductors comprising at least a first partial conductor and a second partial conductor wherein in the first main section the first partial conductor has an outer diameter which is larger than an outer diameter of the second partial conductor and, in the second main section the second partial conductor has an outer diameter which is larger than an outer diameter of the first partial conductor.

An apparatus comprises a strength member and a conductor layer disposed around the strength member. The strength member includes a core formed of a composite material, and an encapsulation layer disposed around the core. The conductor layer includes a low resistance material having a resistivity of less than 10.sup.10 .Math.cm over an operating temperature in a range of from about 40 degrees Celsius to about 250 degrees Celsius. The conductor material may include a superconductor or superconductor like material.

An apparatus comprises a strength member and a conductor layer disposed around the strength member. The strength member includes a core formed of a composite material, and an encapsulation layer disposed around the core. The conductor layer includes a low resistance material having a resistivity of less than 10.sup.10 .Math.cm over an operating temperature in a range of from about 40 degrees Celsius to about 250 degrees Celsius. The conductor material may include a superconductor or superconductor like material.