Abstract: A wireless power transmission device for wirelessly transmitting power to at least one wireless power reception device through a magnetic field, the wireless power transmission device including: a power transmission unit for generating a magnetic field, an impedance matching unit, and a control unit for controlling the impedance matching unit, the impedance matching unit including: a plurality of first circuits which include a capacitor or an inductor and are connected in series to the power transmission unit; a plurality of second circuits which include a capacitor or an inductor and are connected in parallel to the power transmission unit; a matching inductor which is connected in series to the second circuits; and a plurality of switches which are arranged in the first circuits and second circuits and open and close same.

Abstract: A superconducting cable includes a core part, in which the core part includes a former including a plurality of copper wires, a superconducting conductor layer including a plurality of superconducting wires connected in parallel to each other, an insulating layer, and a superconducting shield layer including a plurality of superconducting wires are sequentially arranged. A conducting layer formed of a metal having a current-carrying property at room temperature is provided on opposite surfaces of each of the superconducting wires of the superconducting conductor layer to reinforce mechanical rigidity of each of superconducting wires of the superconducting conductor layer, and the former has a cross-sectional area which is smaller than that of a former of a superconducting cable in which the conducting layer is not added to superconducting wires and which is designed on an assumption that all fault current flows to the former.

Abstract: Disclosed is a high-voltage male connector including: a male terminal formed of a metal material and having a plate shape; an insulating cap provided on a front end of the male terminal; an inner housing into which the male terminal is inserted and mounted such that the front end of the male terminal faces the outside; a partition unit integrally formed with an inner side of the inner housing and having a tetragonal pipe shape covering the male terminal; and an outer housing which is formed of a metal material and into which the inner housing is inserted and mounted.

Abstract: The present invention is to provide a power cable with a termination connection box, in which the occurrence of heterojunction interfaces between the power cable and the termination connection box are reduced to prevent accumulation of space charges and an electric field may be mitigated.

Abstract: The present invention relates to a nuclear power plant cable including: conductors; at least one or more insulation layers adapted to correspondingly surround the conductors; a sheath adapted to surround the insulation layers; and monitoring means adapted to monitor the states of the insulation layers or the state of the sheath in real time.

Abstract: A dual mode antenna including: an insulative sheet; a loop-shaped wireless communication coil formed on a front surface of the insulative sheet; and a wireless power transmission coil formed inside the loop-shaped wireless communication coil to be electrically disconnected from the loop-shaped wireless communication coil, and formed on the front surface and a rear surface of the insulative sheet, the wireless power transmission coil being electrically connected from each other via a via-hole passing through the insulative sheet to wirelessly transmit or receive power.

Abstract: A dual mode antenna including: a wireless communication coil connection terminal; a wireless communication loop antenna electrically connected to the wireless communication connection terminal, and including a loop-shaped wireless communication coil; a wireless power transmission coil arranged inside the wireless communication loop antenna to be electrically disconnected from the wireless communication loop antenna, and configured to wirelessly transmit or receive power; a wireless power transmission coil connection terminal electrically connected to the wireless power transmission coil; and an extension pattern configured to electrically connect the wireless power transmission coil and the wireless power transmission coil connection terminal to each other, and arranged not to overlap with the wireless communication loop antenna.

Abstract: The present invention is mainly directed to providing a wireless power relay device and a wireless power transmission device, which are capable of arranging a relay coil having higher transmission efficiency in a transmission-efficiency reducing section having lower transmission efficiency than those of a plurality of relay coils, thereby preventing power transmission efficiency from sharply decreasing in the transmission-efficiency reducing section.

Abstract: The present invention is mainly directed to providing a wireless power relay device and a wireless power transmission system, which are capable of reinforcing a relay coil in which a high voltage is induced among a plurality of relay coils, thereby preventing the relay coil from being damaged due to the induction of the high voltage.

Abstract: the inventive concept relates to a service plug unit capable of stably maintaining shielding performance even during vibration of a vehicle, safely cutting off high voltage/current power, and preventing an unintended power cut-off caused by an external force such as vibration, a device unit, and a power cutting-off system for use in an electric car and including the same.

Abstract: Disclosed is a high-voltage male connector including: a male terminal formed of a metal material and having a plate shape; an insulating cap provided on a front end of the male terminal; an inner housing into which the male terminal is inserted and mounted such that the front end of the male terminal faces the outside; a partition unit integrally formed with an inner side of the inner housing and having a tetragonal pipe shape covering the male terminal; and an outer housing which is formed of a metal material and into which the inner housing is inserted and mounted.

Abstract: A termination connection box for a direct-current (DC) cable, in which when an outer semiconducting layer, an insulating layer, and an inner semiconducting layer are sequentially removed, a conductor is exposed, the termination connection box, the termination connection box including: a connecting semiconducting layer configured to cover the exposed conductor and the insulating layer; a conductor withdrawal rod electrically connected to the conductor; and a heat shrinkable tube configured such that one portion thereof covers an outer circumferential surface of the cable insulating layer and one end and another end thereof are respectively electrically connected to the conductor and the outer semiconducting layer.

Abstract: Disclosed herein are a flexible printed circuit board for dual mode antennas, a dual mode antenna and a user device using the same. The flexible printed circuit board for dual mode antennas includes a first loop-shaped coil formed at one main surface of an insulative sheet and a second loop-shaped coil formed inside the loop of the first coil.

Abstract: The present invention relates to an insulating wire and, more particularly, to an insulating wire having partial discharge resistance that exhibits excellent partial discharge resistance and high partial discharge inception voltage and also excellences in the adhesion between the conductor and the insulation layer and the flexibility of the insulation layer, which insulating wire can be prepared by a simple process at a low production cost.

Abstract: The present invention relates to a superconducting power system which is capable of effectively absorbing an axial force caused by the contraction of a superconducting cable when the superconducting cable is cooled and in which the superconducting cable is installed in the form of minimizing unnecessary waste of an installation space, and a method of installing a superconducting cable.

Abstract: Disclosed is an insulating winding wire having corona resistance, including a conductor and an insulation coating. The insulation coating includes a basal layer applied to cover the conductor and an outer layer applied to cover the basal layer. The basal layer includes at least one resin selected from the group consisting of polyvinylformal resin, polyurethane resin, heat-resistant polyurethane resin, polyester resin, polyester imide resin, polyamide imide resin, polyimide resin and polyamide resin. The basal layer includes 5 to 15 parts by weight of inorganic insulation particles and 1 to 3 parts by weight of an adhesive agent with respect to 100 parts by weight of the resin and the basal layer has a thickness 70 to 80% of the thickness of the insulation coating.

Abstract: Disclosed are a wireless power receiving apparatus, a wireless power transmission system, and a wireless power receiving method. The wireless power receiving apparatus includes a power receiving coil for receiving a power signal wirelessly transmitted, a rectifier circuit for rectifying the power signal into direct current (DC) output power, a switching unit for controlling input of the power signal to the rectifier circuit at an rear end of the power receiving coil, and a control unit for measuring a voltage of the DC output voltage, comparing the voltage with a predetermined allowable voltage, and controlling an operation of the switching unit.

Abstract: The present invention relates to an insulation composition for a DC power cable and the DC power cable prepared using the same. Specifically, the present invention relates to an improved insulation composition for a DC power cable, which can prevent decrease of DC dielectric strength and decrease of impulse strength caused by accumulation of space charges, and the DC power cable prepared using the same.

Abstract: Provided is a wireless power antenna for wirelessly transmitting, receiving, or relaying power, the wireless power antenna comprising an insulating sheet and a wireless power coil including a split pattern unit including a plurality of patterns spaced from each other in at least a region thereof in a widthwise direction, wherein the split pattern unit is disposed on both a top surface and a bottom surface of the insulating sheet.

Abstract: A wireless power transmission apparatus includes at least one power transmission antenna for transmitting a wireless power signal in a magnetic resonance manner by using a resonant frequency having different bandwidths from each other; a wireless power signal generating module for generating the wireless power signal; at least one wireless power converting module for converting a power level of the wireless power signal generated by the wireless power signal generating module and having different power level conversion ranges corresponding to the bandwidth of the resonant frequency of the power transmission antenna; a multiplexer matching module for selectively connecting the wireless power converting module to a corresponding power transmission antenna; and a control unit for selectively connecting the power transmission antenna and the wireless power converting module according to a required power of a device to be charged to adjust the power level of the wireless power signal.