Abstract: Disclosed herein is a temperature movable structure of a superconducting cable terminal. The superconducting cable terminal has sections of a high temperature portion, a temperature movable portion and an extremely low temperature portion. The temperature movable structure is disposed in the section of the temperature movable portion between the sections of the high temperature portion and the extremely low temperature portion. The temperature movable structure has upper and lower spacer members, a pipe body, first and third conductors, a second conductor and a contact connecting member disposed between the first and second conductors.

Abstract: A terminal apparatus for a superconducting cable system connects an overhead transmission cable or power appliance such as a breaker in an ambient temperature state to a superconducting cable through which power is transmitted at a cryogenic temperature. The terminal apparatus has: a refrigerant tub which is connected to the end of a superconducting cable and is filled with a refrigerant; a vacuum heat insulating container that surrounds the exterior of the refrigerant tub; a current lead having one end connected to the end portion of the superconducting cable and the other end connected to the overhead transmission cable or power appliance through the refrigerant tub and the vacuum heat insulating container; and a superconducting fault current limiter installed at a center portion of the current lead in the interior of the refrigerant tub to limit fault current.

Abstract: An apparatus for supplying liquid nitrogen for a decompression device: includes a liquid nitrogen supply line extending such that high-temperature, high-pressure liquid nitrogen is introduced to a decompression device; a bypass pipe diverging from the liquid nitrogen supply line; and an expansion unit installed at the bypass pipe to evaporate the liquid nitrogen into nitrogen gas. The expansion unit is disposed to absorb heat from the liquid nitrogen in the liquid nitrogen supply line before being introduced to the decompression device.

Abstract: A cryostat of a superconducting cable disclosed herein includes an inner metallic tube filled with liquid nitrogen and extended along the circumference of a core, an outer metallic tube surrounding the circumference of the inner metallic tube at a distance, a cooling vessel of a terminal connecting box connected to the inner metallic tube and filled with liquid nitrogen, an insulation tube surrounding the circumference of the cooling vessel at a distance, an inner bellows tube connecting an end of the outer metallic tube to the cooling vessel, and an outer bellows tube spaced apart from the inner bellows tube and connecting the end of the outer metallic tube to the insulation tube.

Abstract: An apparatus for monitoring an inside of a manhole in which the inside of the manhole is monitored using a simple communication and power supply unit is closed.

Abstract: An apparatus for monitoring an inside of a manhole in which the inside of the manhole is monitored using a simple communication and power supply unit is closed.

Abstract: Disclosed is an optical fiber composite power cable having a loose-tube-type optical fiber impregnated therein, wherein the optical fibers are installed in a loose tube made of metal to prevent lateral pressure from being imposed on the optical fibers by the metal conductors, even when tensile force or bending force is applied to the cable.

Abstract: An underground power cable having an optical fiber sensor for measuring temperature distribution is disclosed. In the power cable, an optical fiber for measuring temperature distribution is received in a stainless steel tube having excellent strength, and this optical tube is interposed between a core and a sheath of the power cable. When arranging the optical tube in the power cable, a supporting material having a relatively low strength than the optical tube is arranged in the cable together in order to prevent the optical fiber from being damaged by external force and prevent the inner insulation layer from being broken down by the optical tube. In addition, a fixing tape for fixing the optical tube in contact with the core may be added to prevent the optical tube from being bent seriously or inclined to one side when the cable is bent.

Abstract: Apparatus and method for real-time analysis of an electric power transmission link status direct buried or installed in a duct or a tunnel are described. The method includes: real-time measuring a surface distributed temperature of the link by using a distributed temperature sensor installed along a longitudinal direction of the link; calculating a conductor temperature of the link on the basis of the surface distributed temperature and an electric current flowing through the link; calculating a heat flow emitted out of the link on the basis of the surface distributed temperature and the conductor temperature; and real-time calculating a thermal parameter of an environment around the link on the basis of the heat flow. Thus, it is possible to calculate operating conditions of the link more accurately and improve safety of electric power transmission by real-time calculating the thermal parameter of the environment around the link.

Abstract: Disclosed is an optical fiber composite power cable having a loose-tube-type optical fiber impregnated therein, wherein the optical fibers are installed in a loose tube made of metal to prevent lateral pressure from being imposed on the optical fibers by the metal conductors, even when tensile force or bending force is applied to the cable.

Abstract: A method of manufacturing a dielectric filter comprises the steps of: forming a dielectric block; depositing a conductor on the side surfaces and the second surface of the dielectric block, and forming a plurality of resonators, forming input and output terminals on the side surface of the dielectric block, and forming conductive patterns on at least a part of the area of the first surface; and depositing a thermosetting resin on the first surface provided with the conductive patterns, and curing the thermosetting resin. The dielectric filter comprising the protection layer on an open surface prevents defects such as a short circuit generated in a trimming step. The interval between the patterns is reduced to less than 0.04 mm, advantageously facilitating miniaturization of the dielectric filter.

Abstract: Apparatus and method for real-time analysis of an electric power transmission link status direct buried or installed in a duct or a tunnel are described. The method includes: real-time measuring a surface distributed temperature of the link by using a distributed temperature sensor installed along a longitudinal direction of the link; calculating a conductor temperature of the link on the basis of the surface distributed temperature and an electric current flowing through the link; calculating a heat flow emitted out of the link on the basis of the surface distributed temperature and the conductor temperature; and real-time calculating a thermal parameter of an environment around the link on the basis of the heat flow. Thus, it is possible to calculate operating conditions of the link more accurately and improve safety of electric power transmission by real-time calculating the thermal parameter of the environment around the link.

Abstract: An underground power cable having an optical fiber sensor for measuring temperature distribution is disclosed. In the power cable, an optical fiber for measuring temperature distribution is received in a stainless steel tube having excellent strength, and this optical tube is interposed between a core and a sheath of the power cable. When arranging the optical tube in the power cable, a supporting material having a relatively low strength than the optical tube is arranged in the cable together in order to prevent the optical fiber from being damaged by external force and prevent the inner insulation layer from being broken down by the optical tube. In addition, a fixing tape for fixing the optical tube in contact with the core may be added to prevent the optical tube from being bent seriously or inclined to one side when the cable is bent.

Abstract: Disclosed are a dielectric filter and a duplexer dielectric filter, for preventing a short circuit between patterns generated in a tuning step performed on an open surface, and method for manufacturing the filters. The method for manufacturing a dielectric filter comprises the steps of: forming a dielectric block; depositing a conductor on the side surfaces and the second surface of the dielectric block, and forming a plurality of resonators, forming input and output terminals on the side surface of the dielectric block, and forming conductive patterns on at least a part of the area of the first surface; and depositing a thermosetting resin on the first surface provided with the conductive patterns, and curing the thermosetting resin. The dielectric filter comprising the protection layer on an open surface prevents defects such as a short circuit generated in a trimming step. Therefore, since the interval between the patterns is reduced to less than 0.

Abstract: An integral type dielectric filter is disclosed, in which the insertion loss is minimized, and the damping characteristics desired by the user are satisfied. The dielectric filter includes a dielectric block having first and second faces facing toward each other and having a plurality of side faces. A ground electrode is coated on the entire faces of the dielectric block except the first face. A plurality of through holes pass through the first and second faces, with their surfaces being coated with a conductive material. Input and output electrodes are formed on a face of the dielectric block insulatingly from the ground electrode, for forming an electromagnetic coupling with internal electrodes of the plurality of the through holes.