摘要:
A superconductive cable capable of promoting a heat insulating function by a heat insulating tube. A heat insulating tube contained within a cable core of a superconductive cable includes a first metal tube and a second metal tube and a third metal tube arranged from an inner side in a diameter direction. An inner side heat insulating portion is formed between the first metal tube and the second metal tube, and an outer side heat insulating portion is formed on an inner side of the third metal tube and on an outer side of the inner side heat insulating portion. A heat insulating function of the heat insulating portion on an outer side is set to be lower than a heat insulating function of the heat insulating portion on an inner side thereof.
摘要:
In a DC power transmission and distribution line, a power cable line for making it possible to easily supply power to various electric power machines used for operation of the line is provided.A power cable line includes a power cable (1g, 1r, 1p, 1m, 1n) for executing DC transmission and distribution, an AC superposing section 2 for superposing an AC component on the power cable, and a branch power supply section 3 for taking out power induced by the superposed AC component from the cable. The AC component is superposed on the power cable by the AC superposing section 2 and AC power together with DC power is transmitted to the power cable. The superposed AC component is taken out by the branch power supply section 3 provided in a midway point of the cable and is supplied to various electric power machines.
摘要:
In a DC power transmission and distribution line, a power cable line for making it possible to easily supply power to various electric power machines used for operation of the line is provided.A power cable line includes a power cable (1g, 1r, 1p, 1m, 1n) for executing DC transmission and distribution, an AC superposing section 2 for superposing an AC component on the power cable, and a branch power supply section 3 for taking out power induced by the superposed AC component from the cable. The AC component is superposed on the power cable by the AC superposing section 2 and AC power together with DC power is transmitted to the power cable. The superposed AC component is taken out by the branch power supply section 3 provided in a midway point of the cable and is supplied to various electric power machines.
摘要:
A DC OF cable has its main insulation composed of a composite insulation tape comprising a low dielectric loss film and kraft paper (PPLP). 1-10 sheets of kraft paper are wound on the PPLP main insulation as a layer on the inside and/or the outside thereof.
摘要:
An optical-fiber incorporated longer-sized subaqueous unit comprises optical fiber units arranged inside or outside a plastic sheath provided on the periphery of the core body of the longer-sized subaqueous unit such as power cable core or water supply tube. Each optical fiber unit includes an optical fiber accommodated in a metal pipe having on its periphery a coating layer made of plastic material with a melting point higher than that of the material of the plastic sheath, and armoring iron wire bundles are further provided outside the plastic sheath on the periphery of the core body, thereby preventing any buckling in the optical fiber units.
摘要:
An insulating polyolefin laminate paper and a method for producing such a paper in which first and second fiber paper layers are laminated to a polyolefin film layer. The fiber paper layers have an impermeability of 20 to 4000 Gurley-seconds. At least one of the fiber paper layers is mechanically deformed in such a manner that irregularities are produced having a depth of 2 to 50% of the thickness of the fiber paper layer. The mechanical deformation is accomplished prior to lamination. Before lamination, the water content of the fiber paper layers is controlled to be no more than 4%. Preferably, the thickness of the fiber paper layers is at least 30 microns. Furthermore, an electric power supply cable includes an insulating polyolefin laminate paper as an insulating layer.
摘要:
Provided is a superconducting cable capable of maintaining a predetermined thermal insulation property without having a vacuum thermal insulation structure. The superconducting cable of the present invention includes: a cable unit 100, in which a core having a superconductor layer and an electrical insulation layer is housed in a core-housing pipe; a thermal insulation member 200 which is provided outside the cable unit and maintained in a non-vacuum state; and a sealing member for preventing the permeation of moisture into the thermal insulation member. By equipping the outside of the cable unit with the thermal insulation member 200 which is maintained in a non-vacuum state, it is made possible to maintain the predetermined thermal insulation property without having a vacuum thermal insulation structure.
摘要:
An insulating polyolefin laminate paper and a method for producing such a paper in which first and second fiber paper layers are laminated to a polyolefin film layer. The fiber paper layers have an impermeability of 20 to 4000 Gurley-seconds. At least one of the fiber paper layers is mechanically deformed in such a manner that irregularities are produced having a depth of 2 to 50% of the thickness of the fiber paper layer. The mechanical deformation is accomplished prior to lamination. Before lamination, the water content of the fiber paper layers is controlled to be no more than 4%. Preferably, the thickness of the fiber paper layers is at least 30 microns. Furthermore, an electric power supply cable includes an insulating polyolefin laminate paper as an insulating layer.
摘要:
A testing chamber for electrically testing a sample of insulating material or materials in sheet form, under controllable conditions of pressure and temperature. The pressure resistant chamber is air and liquid tight to permit testing of oil impregnated samples unexposed to harmful air. A frame is positioned within the chamber. A supply reel storing a test sample of insulating material or materials and a takeup reel for receiving the test sample drawn from the supply reel are both rotatably mounted on the frame. The supply and takeup reels are separated from each other to form a testing station therebetween. A shaft with a handle is attached to the takeup reel and extends out of the chamber to facilitate rotation of the takeup reel whereby the test sample may be removed from the supply reel to the testing station and then to the takeup reel. First and second electrodes are connected, respectively, to the high and low voltage terminals of a power supply. Position and pressure producing means are operatively connected to at least one of the electrodes to control the spacing between the electrodes and the pressure applied to the test sample by the electrodes.
摘要:
Provided is a superconducting cable capable of maintaining a predetermined thermal insulation property without having a vacuum thermal insulation structure. The superconducting cable of the present invention includes: a cable unit 100, in which a core having a superconductor layer and an electrical insulation layer is housed in a core-housing pipe; a thermal insulation member 200 which is provided outside the cable unit and maintained in a non-vacuum state; and a sealing member for preventing the permeation of moisture into the thermal insulation member. By equipping the outside of the cable unit with the thermal insulation member 200 which is maintained in a non-vacuum state, it is made possible to maintain the predetermined thermal insulation property without having a vacuum thermal insulation structure.