Abstract: An electromagnetic contactor includes: a lower frame having an accommodation space therein; a bobbin having a fixed core, and accommodated in the lower frame; a movable core inserted into the bobbin so as to be moveable up and down; a spring installed between the bobbin and the movable core, and configured to provide an upward restoration force to the movable core; and a ‘b’ contact switch installed at one side of the bobbin, wherein a button for operating a switch lever of the ‘b’ contact switch is provided at a movable core plate positioned above the movable core.

Abstract: The present invention relates to a direct current relay, and more particularly, to a direct current relay capable of reducing an electronic repulsive force generated between a fixed contact and a movable contact by a permanent magnet installed to extinguish an arc. The direct current relay includes: a frame; first and second fixed contacts spaced from each other with a predetermined distance there between; first and second magnetic substances formed to enclose a lower part of the first and second fixed contacts; a movable contact movable to contact or to be separated from the first and second fixed contacts, having a first movable contact contactable to the first fixed contact, and having a second movable contact contactable to the second fixed contact; and a pair of permanent magnets installed on long sides of the frame.

Abstract: A luminaire and reflector module for the luminaire are disclosed wherein the reflector has a base plate defining a plurality of reflector light source apertures and a plurality of reflectors extending integrally and individually from the base plate adjacent to the light source apertures.

Abstract: The constant voltage supplying circuit for a circuit breaker according the invention comprises: a first switching device; a constant current source configured to supply a constant current; a feedback circuit section commonly connected to an output terminal of each of the first switching device and the constant current source; a constant voltage source connected to the feedback circuit section, and configured to supply a constant voltage; a current adjusting circuit section connected to the output terminal of the first switching device, and configured to adjust an output current of the first switching device; and a divided voltage resistor section including a first resistor and a second resistor, and configured to provide a divided voltage of an output voltage of the constant voltage supplying circuit, to the feedback circuit section, through a connection node between the first resistor and the second resistor.

Abstract: A method of controlling voltage balancing of a modular multi-level converter is provided. The method includes receiving state information on each of n sub modules in an arm module, grouping the n sub modules into m sub module groups, receiving first state information on each of sub modules in a first one of the m sub module groups, among the state information on each of the n sum modules, receiving second state information on each of sub modules not included in the first sub module group, among state information on each of the n sum modules previously stored in a memory, controlling switching of a sub module by using the first state information and the second state information, and updating the memory with the first state information.

Abstract: The present disclosure includes: a first channel unit configured to transmit and receive a data piece with a network bus, to convert the received data piece to an MII data piece, and to transmit and receive the converted MII data piece; a second channel unit configured to transmit and receive a data piece with the network bus, to convert the received data piece to an MII data piece, and to transmit and receive the converted MII data piece; a CPU configured to recognize a carrier detection signal (CRC) of the MII data received from the first channel unit and the second channel unit, and to transmit and receive the MII data; and a monitoring unit configured to perform a data communication with the CPU, and to monitor a data piece by each channel from the MII data received from the CPU.

Abstract: Provided is a charger for an electric vehicle. The charger for an electric vehicle includes a light emitting unit displaying charging operation information of the charger, a communication unit performing near-field wireless communication with an external device, a guide guiding visible light of the light emitting unit, and a control unit controlling operations of the light emitting unit and the communication unit. The guide includes a reflective layer surrounding a portion of the outside of the guide to reflect the visible light toward the inside of the guide.

Abstract: The present disclosure relates to an apparatus for diagnosing a DC link capacitor. A DC voltage provided from a power supplier to a motor is controlled to have a predetermined level (or magnitude). When a voltage of the DC link reaches a predetermined voltage, the ratio of change of capacitance values of the DC link capacitor is estimated, by considering power consumption of a resistor of the motor (i.e., power consumption of a load), power consumption of the power supplier and a switching loss of an inverter part, and a deteriorated level of the DC link capacitor is diagnosed using the estimated ratio.

Abstract: A electric power control device for a hybrid electric power system according to the present disclosure includes an electric power measuring unit that is configured to measure output electric power of the electric power system, and a controller that is configured to control operations of a first electric power generator and a second electric power generator of the electric power system based on a preset control mode and the measured output electric power, wherein the controller controls an output voltage of the first electric power generator to be a first offset voltage corresponding to an output of the second electric power generator for a first time when the output of the second electric power generator is controlled to be switched from an ON state into an OFF state.

Abstract: A diagnosis system for monitoring a status of a switchboard is provided. The diagnosis system for monitoring a status of a switchboard includes a sensor unit installed in a switchboard, wherein the sensor unit comprise a plurality of sensors sensing two or more of a partial discharge (PD) signal, a temperature signal and an acc signal and outputting each switchboard status sensing signal; a data collecting device receiving each switchboard status sensing signal corresponding to two or more of the PD signal, the temperature signal, and the arc signal from the sensor unit wherein the data collecting device collects a plurality of datums for status monitoring and diagnosis control of the switchboard based on each switchboard status sensing signal received; and a remote monitoring device performing the status monitoring and diagnosis control of the switchboard based on a plurality of measuring datums received from the data collecting device.

Abstract: Disclosed is a method for voltage dip compensation of inverter, the method including reducing an output frequency of an inverter to obtain a regenerative energy when it is determined that power failure has occurred during the inverter operation, adjusting increase/decrease of inverter output frequency in response to size of exceeding current and voltage based on an output current and DC-link voltage of the inverter, increasing the inverter output frequency in order to prevent excessive current flow when power restoration occurs at a power failure state, and returning to a speed prior to the momentary voltage dip by gradually increasing the inverter output frequency in a state where the inverter output frequency does not exceed an over-current limit by monitoring the inverter output frequency.

Abstract: An apparatus and method for controlling an operation of an inverter are provided. In the inverter control apparatus, an operation signal input unit detects a current of each phase output from an inverter. An error detecting unit detects whether there is a fault of the inverter on the basis of the current detected by the operation signal input unit. A controller controls driving of the inverter according to a type of the fault detected by the error detecting unit. A storage unit stores a kind of fault of the inverter and a corresponding fault type on the basis of the current detected in the operation signal detecting unit.

Abstract: The present disclosure relates to a log data processing apparatus and a method for controlling the same. A log data processing apparatus according to an embodiment includes a communication unit configured to receive information on log data corresponding to an application from a device for generating the log data, a control unit configured to generate a log message on a basis of the log data information, and a storage unit configured to store the log message and generation history information of the log message generated, wherein the log data information includes a log message parameter, message code information, and identifier information of the application.

Abstract: An apparatus for controlling speed in railway vehicles is disclosed, the apparatus estimates a future train speed and determines a control input (first speed control) configured to control a train speed based on a TTSLC {Time-To-Speed-Limit Crossing, a time taken by a train from a current time to exceed an ATP (Automatic Train Protection) speed profile, which is an ATP speed limit}, and determines a control input (second speed control) configured to control the train speed based on a difference between the ATP speed profile and an actual train speed, whereby the first speed control or the second speed control is selected in response to the TTSLC and outputted to the train.

Abstract: The present invention relates to a system for assessing a health index of a switchgear, and the system comprises a remaining life assessment unit that calculates a remaining life of the switchgear based on a number of uses, a number of operations, and history information of the switchgear; a deterioration degree assessment unit that examines a deterioration degree of the switchgear based on installation environment information and inspection information; a risk degree assessment unit that detects a risk degree of the switchgear based on partial discharge data, insulating gas analysis data, and temperature data; and a health index assessment unit that assesses a health index of the switchgear based on the remaining life information of the switchgear, the deterioration degree information, and the risk degree information of the switchgear.

Abstract: An operating method of a synchronous machine is provided, the operating method including: generating an MTPA (Maximum Torque Per Ampere) curve, based on a current limiting circle depending on a rated current of an inverter or a motor and a torque curve depending on a torque command; generating a voltage limiting ellipse, based on a DC-link voltage; displaying, on an X-Y plane, the current limiting circle, the torque curve, the MTPA curve, and the voltage limiting ellipse; and computing a d-axis current and a q-axis current, based on an intersection point between at least two of the current limiting circle, the torque curve, the MTPA curve, and the voltage limiting ellipse, displayed on the X-Y plane.

Abstract: The protecting relay may include: an input conversion unit configured to receive the analog signal and sample the analog signal according to a pre-set sampling period; a multiplexer configured to selectively output any one of a plurality of signals output from the input conversion unit; a programmable gain amplifier (PGA) configured to set different gain values according to signals output from the multiplexer, and amplify a signal output from the multiplexer with a pre-set gain value; an analog-to-digital converter (ADC) configured to convert an analog signal output from the PGA into a digital signal; and a controller configured to determine whether the analog signal received through the input conversion unit includes a surge signal based on the plurality of sampled data which have been converted into the digital signal, and determine whether to perform a relay function based on the determination results.

Abstract: Provided is a portable charger connected to a wall electric power source and configured to supply an electric power from the wall electric power source to a load. The portable charger includes a plug, an electric wire, a switch, a first detection unit, a second detection unit, and a control unit. The control unit is configured to supply an electric power through the electric wire to the load when the plug is plugged in the socket and to cut off the supply of the electric power flowing through the electric wire by controlling the switch on the basis of the user's approach that is detected by the first detection unit, and the tensile force that is detected by the second detection unit while the electric power is being supplied.

Abstract: Disclosed is a magnetic contactor. The magnetic contactor includes a frame, a bobbin provided in the frame, and configured to include a hollow part, a movable core movably inserted into the hollow part in an axial direction, a yoke disposed at the outer surface of the bobbin to be separated from the coil and to face each other, and configured to act as a fixed core, and a manipulating circuit part disposed at the outer surface of the bobbin in parallel with a moving direction of the movable core to intersect the yoke. The coil is wound around an outer surface of the bobbin. Accordingly, a coil having a broad rated voltage range is used. Also, a structure of a product is simplified, and a space is broadly used.