Abstract: An electric leakage determination circuit for an electric leakage circuit breaker according to the invention comprises a zero current transformer on an alternating-current circuit to provide an electric leakage detection signal upon occurrence of electric leakage, a filter circuit unit connected to an output terminal of the zero current transformer to remove noise, and an electric leakage determination circuit unit comparing a voltage value of the electric leakage detection signal with a first reference voltage value, to be charged with electric charges when the voltage value is not smaller than the first reference voltage value and discharge electric charges when being smaller than the first reference voltage value, and comparing a charged voltage value with a second reference voltage value to determine occurrence of electric leakage when the charged voltage value is not smaller than the second reference voltage value.

Abstract: An apparatus for gastric bypass is disclosed. The apparatus for gastric bypass includes a primary passage having an input and an output. The apparatus also includes a bypass conduit, coupled to the primary passage, having an input and an output, wherein the passage input is interspersed with the conduit input. The apparatus further has a primary regulator coupled to the primary passage and adjustable to control a primary flow profile from the input to the output of the primary passage. The apparatus also has a bypass regulator coupled to the bypass conduit and adjustable to control a bypass flow profile from the input to the output of the bypass conduit.

Abstract: A method of verifying a protection apparatus is provided. The method includes: setting a plurality of relay elements for sensing an abnormal state of the protection apparatus; receiving an input regarding test information for testing each of the plurality of relay elements; and when at least one of the plurality of relay elements is in an abnormal state from the reception of the input regarding the test information, identifying whether the protection apparatus has created an abnormal state sensing signal.

Abstract: A molded case circuit breaker (MCCB) includes a case, an interrupter assembly, an exhaust guide part, an exhaust cover, a sealing groove and a sealing projection. The interrupter assembly is mounted inside the case, and has an arc gas exhaust port to exhaust an arc gas generated inside the case. The exhaust guide part is disposed between the interrupter assembly and the terminal part, and has an exhaust chamber therein to provide an arc gas passage between the arc gas exhaust port and a vent chute of the terminal part. The exhaust cover is mounted to the case in a structure covering the exhaust guide part, to seal the arc gas passage. The sealing groove is formed in an inner surface of the exhaust cover. The sealing projection is formed on the arc gas exhaust port of the interrupter assembly, to be inserted and coupled into the sealing groove.

Abstract: A fault current detection circuit comprises a primary current transformer that detects a current; a pair of secondary current transformers that convert a current detection signal into secondary conversion signals with a small current; a fault detection circuit section that determines whether or not a fault current occurs by comparing a current value according to a secondary conversion signal with a predetermined reference current value; a surge detection circuit section that determines whether or not a surge current occurs on the electric power circuit; and a trip determination unit that receives a fault detection signal and a surge detection signal, and generates a trip control signal when at least either one of the fault detection signal and the surge detection signal is received.

Abstract: The present disclosure includes a master device, a plurality of slave devices performing a communication through Profibus and a configuration tool providing network configuration information of Profibus DP by generating the network configuration information, wherein the configuration tool includes an automatic configuration module configured to request the master device of information relative to the plurality of slave devices in response to an automatic configuration command inputted through a user communication module, to receive the information and provide profiles of relevant types by determining the types of the plurality of slave devices using the received information, and a network configuration information configured to generate the network configuration information in response to the types and profiles determined by the automatic configuration module and to provide the network configuration information to the master device.

Abstract: The present disclosure may fix the second yoke without using an upper cover and a lower cover, thereby having an effect of simplifying the entire structure, and reducing the fabrication cost, and decreasing the fabrication time.

Abstract: A power system is provided. The power system includes a power device group including a power device, at least one communication device mutually connected through a short range communication network, and a monitoring/controlling device connected to the communication device in a wired manner and transmitting and receiving state information data and control data of the power device through the communication device. The communication device includes a first communication unit connecting the communication devices through the shore range communication network, and a second communication unit connected to the monitoring/controlling device in a wired manner.

Abstract: A reverse battery protection device and an operating method thereof are provided. The reverse battery protection device includes a signal generating unit measuring a voltage of a battery, and, when the measured voltage is not smaller than a reference voltage, generating an electrical signal, a signal converting unit converting the generated electrical signal into a DC voltage, and a switch unit switching to allow a current to flow between the battery and a converter, when the converted DC voltage is received.

Abstract: An apparatus for modifying voltage command for detecting output current in inverter is disclosed to modify a PWM voltage command by determining a sector in a voltage hexagon, the sector having a PWM voltage command therein, by comparing the PWM voltage command, determining an area, the area having the PWM voltage command, within a current detection disabled area by converting a minimum sampling time to a minimum sampling PWM and using the converted minimum sampling PWM, and determining an adjusting voltage and a restoring voltage using a minimum injection voltage based on the determined area.

Abstract: A motor starter comprising a manual motor starter (MMS) is provided. The MMS comprises an MMS status input unit to receive a status of the MMS, a magnetic contactor (MC) status input unit to receive a status of a magnetic contactor, a communication unit connected via a wired cable to communicate data with a monitoring control console, and a controller to transmit MMS information received from the MMS status input unit and MC information received from the MC status input unit to the monitoring control console and to control the magnetic contactor based on a control signal received from the monitoring control console and the MC information.

Abstract: A transformer position adjustment preventing device includes a case having a handle insertion unit formed therein, a position displaying unit disposed in the case and displaying a test position or an operation position of a transformer truck with a transformer seated thereon, a rotating member disposed in the case, connected to the position displaying unit, rotated by the rotation of the position displaying unit to open or close the handle insertion unit, and a restricting member rotated in a direction of the rotating member or an opposite direction of the rotating member according to opening or closing of a door opening and closing the transformer chamber in which the transformer truck is disposed, so as to restrict the rotation of the rotating member or release the restriction state.

Abstract: Disclosed is a battery charging apparatus. The battery charging apparatus includes a charging plug receiving an AC power supplied from an outside, a plurality of charging units individually converting the AC power received through the charging plug into a DC power, a battery storing the DC power output through at least one of the charging units, and a charging control unit comparing a specification of the battery with specifications of the charging units, determining at least one of the charging units to be used for charging of the battery, and controlling the charging of the battery by the at least one charging unit that is determined.

Abstract: An analog current output module includes an MPU generating and outputting a digital signal, a D/A converter converting the digital signal into an analog signal and outputting the analog signal, an analog current output circuit outputting a control current corresponding to the analog signal output from the D/A converter, and an overload detecting unit detecting whether an overload occurs by measuring the control current and comparing a value of the control current and a preset reference value, wherein the overload detecting unit sets the reference value on the basis of a reference value generating signal delivered from the MPU, and the overload detecting unit comprises a comparator comparing the control current value and the reference value and detecting whether the overload occurs, and a reference value setting unit generating the reference value according to the reference value generating signal and providing the reference value to the comparator.

Abstract: A static Voltage Ampere Voltage Reactive (VAR) comparator including: a plurality of capacitors being in a Y-connected structure and supplying three-phase alternating current power according to a switching operation; a plurality of bidirectional thyristors connected to the plurality of capacitors in serial to open and close the plurality of capacitors; and a controller, in response to power applied to the static VAR compensator, periodically applying a firing pulse signal to the plurality of bidirectional thyristors reaching to a voltage phase on which a transient current is minimized, wherein, at a point in time when first applying the firing pulse signal to one bidirectional thyristor, the controller applies simultaneously applies the firing pulse signal to the one bidirectional thyristor and other remaining bidirectional thyristors allowing a current to flow on three phases.

Abstract: A data measurement device in a high voltage direct current (HVDC) system is provided. The data measurement device includes: a power measurement unit measuring pieces of power related data; and a control unit determining measurement times at which the pieces of power related data are measured respectively, and performing control based on pieces of power related data having a same measurement time among the pieces of power related data.

Abstract: Disclosed is a photovoltaic system including a power optimizer, capable of minimizing noise occurring due to shading, an error in an output power of a photovoltaic module, etc. while a maximum power point tracking (MPPT) algorithm is performed. The photovoltaic system includes a photovoltaic module; a power optimizer; and an inverter, wherein the power optimizer includes: an input unit configured to receive an output power of the photovoltaic module; a sensing unit configured to sense an output voltage and an output current of the photovoltaic module; and a controller configured to control an output of the power optimizer, by comparing the presently-sensed current with a previously-sensed current.

Abstract: A static varr compensation apparatus including: a plurality of capacitor banks supplying three-phase alternating current (AC) power; a plurality of bidirectional thyristors opening and closing the plurality of capacitor banks; and a controller calculating an amount of reactive power necessary to be compensated and controlling the plurality of bidirectional thyristors to open and close the plurality of capacitor banks in correspondence to the calculated amount of reactive power, wherein the plurality of capacitor banks are in a structure of Y connection.