Abstract: Provided is a 3-way switch for a gas-insulated apparatus, including a pressure container having a space part therein, the pressure container including a first connecting part in an upper portion of the space part and a second connecting part in a side portion of the space part such that the second connecting part is perpendicular to the first connecting part, a support conductor provided in the space part, the support conductor having a first guide hole defined in a direction perpendicular to the direction of the first connecting part and a second guide hole defined in a direction parallel to the direction of the second connecting part, a disconnecting switch (DS) operating part slidably coupled to the first guide hole, the DS operating part being connected to or separated from the first connecting part by means of an insertion or extrusion thereof, an earthing switch (ES) operating part slidably coupled to the second guide hole such that the ES operating part is perpendicular to the disconnecting switch oper

Abstract: A gas insulated switchgear includes an enclosure, a first fixed conductor, one side of the first fixed conductor being bent at a right angle and another side of the first fixed conductor being fixed on one side of the enclosure, a second fixed conductor configured to be spaced apart from the first fixed conductor and configured to be fixed on another side of the enclosure, a screw configured to form an axis on inner of the enclosure and being spaced apart from the first and second fixed conductors and a movable conductor configured to move along the axis through a rotation of the screw, one side of the movable conductor being in contact with the second fixed conductor.

Abstract: A gas insulated switchgear includes a support frame, a first fixed conductor being installed on one side of the support frame, a second fixed conductor opposing the first fixed conductor and being installed on another side of the support frame, a screw forming an axis on inner of the support frame and being spaced apart from the first and second fixed conductor, a first movable contact wherein one side of the first movable contact is bent and another side of the first movable contact moves along the axis through a rotation of the screw and a second movable contact wherein one side of the second movable contact is bent and another side of the second movable contact is move along the axis through a rotation of the screw.

Abstract: A device for monitoring internal arc in gas insulated switchgear. The device includes: at least one or more partial discharge sensors that electronic wave signals of partial discharge generated by internal arc in a gas section of the gas insulated switchgear; at least one or more gas pressure wave sensors that measure pressure wave signals due to expansion of a gas produced by internal arc in the gas section of the gas insulated switchgear; a data acquiring unit that receives the electronic wave signals measured by the partial discharge sensors and the pressure wave signals measured by the gas pressure sensors, finds out internal arc on the basis of the received sensor measure information, and determines the reason and the position of the internal ark; and a transmitting unit that transmits the sensor measurement information and determination information from the data acquiring unit to a super-system.

Abstract: The present invention relates to a device for treating ballast water using an electrolysis method so as to prevent ship explosions, and to a method for controlling the prevention of ship explosions using same. The device for treating ballast water using an electrolysis method is installed in a ship, wherein the apparatus comprises: a partition wall for separating an explosion danger zone in which a ballast tank is installed, and a safety zone in which the apparatus for treating ballast water is installed; a chlorine-injection tube linearly passing through said partition wall so as to connect the apparatus for treating ballast water to the ballast tank; and a compressor installed in said chlorine-injection tube so as to maintain a positive pressure in said chlorine-injection tube by transferring water into said chlorine-injection tube, even when an operation using the chlorine-injection tube is stopped.

Abstract: Provided is an apparatus for managing the operation of a ship block, including a ship block size and location measuring system, a transporter monitoring system, a block transportation monitoring system and a transportation lot number management system. The ship block size and location measuring system includes a direction angle sensor, a range finder, a radio frequency identification (RFID) reader and a control system, and the control system includes a block size and location measuring server, a vector calculating module, a coordinate calculating module, a size and location extracting module, and a memory module.

Abstract: The disclosure relates to a cubicle type gas insulated switchgear monitoring and diagnosis system that is able to remotely monitor and diagnose the state by measuring and analyzing in real time deterioration of a gas section and the operation state and the integrity assessment of a breaking unit in a cubicle gas insulated switchgear. The system includes the cubicle gas insulated switchgear, a Slave Data Acquisition System connected to the cubicle gas insulated switchgear, and a Master Data Acquisition System that determines deterioration of the cubicle type gas insulated switchgear and the operation state and the integrity assessment of the breaking unit by receiving and analyzing the sensing data from the S-DAS.

Abstract: Disclosed are a catalyst for synthesis of methanol from synthesis gas and a method for preparing the same. The catalyst includes a Cu—Zn—Al oxide containing CuO, ZnO and Al2O3 in a predetermined ratio or Cu—Zn—Al—Zr oxide containing CuO, ZnO, Al2O3 and ZrO2 in a predetermined ratio, in combination with a cerium-zirconium oxide obtained by a sol-gel process. As compared to the existing Cu—Zn—Al catalysts for synthesizing methanol, the catalyst disclosed herein inhibits formation of byproducts and improves yield of methanol. Therefore, it is possible to improve methanol purification efficiency and carbon conversion efficiency.

Abstract: Disclosed is an inverter with outputs being connected through two reactors to a utility network, whilst an energy storage capacitor (C) is connected to the PV array (P) such that the C + and ? terminals are connected to two half bridges creating an H bridge so that the AC node of one half bridge is connected to the anode of a diode (D1) and the cathode of a diode (D2). An AC node of the other half bridge is connected to an anode of a diode (D3) and a cathode of a diode (D4), whilst the diodes form a diode bridge having a positive node connected to a transistor's (V5) collector and an anode of a diode (D5), the cathode of the diode (D5) being connected to C's positive terminal.

Abstract: Provided is a pipe welding apparatus, including: a support fixed to the ground; a torch which is supported by the support and is formed to correspond to a welding portion of a pipe; and a first rotation part for rotating the torch in a circumferential direction of the pipe up to a predetermined angle.

Abstract: An electronically controlled fuel injection valve can independently control the time to inject fuel and the amount of fuel to be injected in response to a control signal sent from the operating condition of an engine unlike a traditional mechanical fuel injection valve, and employs a control method for fuel injection that increases the force of lifting up a cutoff needle of an injection controller by delivering high-pressure fuel to a lower pressure chamber via a control needle, thereby rapidly controlling fuel injection. The electronically controlled fuel injection valve prevents a nozzle part from being constantly subjected to high pressure due to the nozzle part being not supplied with fuel when fuel is not injected, prevents a large amount of fuel from leaking into a combustion chamber when a part such as a needle is damaged, and simplifies the structure of a second flow path, thereby facilitating fabrication.

Abstract: Disclosed are a catalyst for preparing synthesis gas from natural gas and carbon dioxide, and a method for preparing the same. More particularly, a combined reforming process is performed as an economical way of using carbon dioxide, wherein steam reforming of natural gas is carried out simultaneously with carbon dioxide reforming of methane in such a manner that a predetermined ratio of carbon monoxide/carbon dioxide/hydrogen (H2/(2CO+3CO2)=0.85-1.15) is maintained. In this manner, the catalyst is used to prepare synthesis gas suitable for methanol synthesis and Fischer-Tropsch synthesis. Disclosed also is a method for preparing synthesis gas on a specific catalyst consisting of Ni/Ce/MgAlOx or Ni/Ce-Zr/MgAlOx. The catalyst is inhibited from deactivation caused by generation of cokes during the reaction as well as deactivation caused by reoxidation of nickel with water added during the reaction. Therefore, the catalyst shows excellent activity as compared to other catalysts for use in combined reforming.

Abstract: Disclosed herein is a fuel injection valve for an internal combustion engine. The fuel injection valve includes a valve body (10), a nozzle (20), a valve plate (30), a main needle spindle (40), a main needle (50), a main needle spring (60), a spring plate (70), a pilot needle spring (80), a pilot needle spindle (90) and a pilot needle (100). In the present invention, both the main needle and the pilot needle are opened or only the pilot needle is opened by compressed high-pressure fuel oil or compressed air, thereby enabling main injection and pilot injection to be separately performed by the single fuel-injection valve. Furthermore, because opening of the main needle valve can be controlled by compressed air for ignition or control of an engine, only the pilot injection may be conducted even without using a separate compression apparatus or the like.

Abstract: The present invention relates to a two-stage fuel injection valve. The two-stage fuel injection valve of the present invention is configured such that the pressure of main fuel delivered from an injection pump is applied to a plunger in a main fuel chamber, and subsequently delivered to an ancillary fuel pressure chamber via the plunger so as to compress ancillary fuel, such that a needle is retracted in a manner similar to those of slide valves by means of the pressure of the ancillary fuel so as to open an ancillary fuel nozzle hole and inject the ancillary fuel, and a main fuel nozzle hole is opened after the injection of the ancillary fuel so as to inject the main fuel, thereby conducting two-stage fuel injection.

Abstract: A method for manufacturing a back contact solar cell according to the present invention comprises the following steps: preparing a p-type silicon substrate having a via hole; performing a diffusion process to form an emitter layer all over the surface of the substrate; forming an etching mask on the front surface and back surface of the substrate so as to selectively expose a portion of the substrate; etching a portion of the thickness of the substrate in the region exposed to the etching mask so as to remove an emitter layer in the relevant region; forming an anti-reflection film on the front surface of the substrate; and forming a grid electrode on the front surface of the substrate, and forming an n-electrode and a p-electrode on the back surface of the substrate.

Abstract: A GIS (Gas Insulated Switchgear) includes a main bus compartment including a main bus-bar unit, a transfer bus compartment including a transfer bus-bar unit, a sealed circuit breaker compartment including a circuit breaker unit and a load side compartment including a current transforming unit and a transfer bus conductor electrically coupling the transfer bus-bar unit and the current transformer unit. The circuit breaker unit is contained in the sealed circuit breaker compartment being separately independent from other compartments. The transfer bus conductor passes from the transfer bus-bar unit through the load side compartment to the current transformer unit without passing through the circuit breaker compartment. The sealed circuit breaker compartment and the load side compartment do not share insulating gas.

Abstract: The present invention relates to a fuel injection pump having a variable pressure chamber which can adjust a fuel injection timing according to each engine load with a simple structure and a lower manufacture cost compared to the conventional injection pump without a separate apparatus for moving a barrel as well as not modifying a shape of a plunger.

Abstract: The present disclosure relates to a method for manufacturing a back electrode-type solar cell. The method for manufacturing a back electrode-type solar cell disclosed herein includes: A method for manufacturing a back electrode-type solar cell, comprising: preparing an n-type crystalline silicon substrate; forming a thermal diffusion control film on a front surface, a back surface and a side surface of the substrate; forming a p-type impurity region by implanting p-type impurity ions onto the back surface of the substrate; patterning the thermal diffusion control film so that the back surface of the substrate is selectively exposed; and forming a high-concentration back field layer (n+) at an exposed region of the back surface of the substrate and a low-concentration front field layer (n?) at the front surface of the substrate by performing a thermal diffusion process, and forming a p+ emitter region by activating the p-type impurity region.

Abstract: Provided is a combined explosion-proof electromotor, which includes a body in which an interior space is formed and whose one end is open in an axial direction, a terminal box whose one end is open in the axial direction so as to face the open end of the body and in which a space is formed to hold terminal cables extending from the outside, and a middle plate that is disposed between the opposing ends of the body and the terminal box which are connected by separate fastening means and that includes terminal insertion holes through which ends of the terminal cables are inserted into the body.

Abstract: The present invention relates to a dual fuel injection valve having a pumping nozzle for a diesel engine and a gas engine, and an objective of the present invention is to provide a fuel injection valve in which, by using two kinds of fuel entering into a fuel valve, a warming up and injection of pilot fuel may be performed in an initial injection and injection of main fuel may be performed subsequently such that subsequent dual fuel is used for combustion, thereby increasing fuel injection performance.