Abstract: A charging device includes: a plurality of main relays forming a connection between an electric vehicle (EV)-side connector and an outlet-side connector; a relay welding sensing unit connected to the plurality of relays to sense the presence or absence of welding of the plurality of relays; a welding monitoring relay opening and closing between the relay welding sensing unit side node and a main relay side node; and a control unit controlling the open and close of the welding monitoring relay.

Abstract: An electric energy storage apparatus according to an embodiment may include a grid configured to supply first electric energy; a generator configured to supply second electric energy; and an electric energy storage apparatus configured to receive and store at least one of the first electric energy and the second electric energy, and supply the stored electric energy or the received electric energy to an electric load, wherein the electric energy storage apparatus senses a magnitude of electric energy discharged to the grid in an operation mode of supplying the stored electric energy to the electric load, and changes the operation mode when the sensed magnitude of electric energy exceeds a preset first threshold value.

Abstract: In some embodiments, a PLC system includes a memory unit configured to back up user data stored in a MCU thereto when the power supply from the power module is interrupted, a capacitor configured to be charged by the power module and supply accumulated power to the memory unit when the power from the power module to the MCU is interrupted, a variable resistor unit configured to be coupled between the power module and the capacitor, and a switching unit configured to alternatively couple either the power module or the capacitor to the memory unit depending on a state of power being supplied from the power module. Some embodiments may provide advantages that a PLC system can supply much more power while reducing a charging period of time of an auxiliary power supply for supplying power with urgency when an abnormality occurs in a power module of the PLC system.

Abstract: In some embodiments, a cooling device of a power transformer is presented and, more particularly, to a cooling device of a power transformer which may include a heat pipe and a heat sink to improve cooling performance, and to attenuate noise by eliminating a cooling fan.

Abstract: A PLC data log module with backup function is proposed, the module including an internal memory configured to store the log data and to transmit the stored log data to the external memory, a backup memory configured to back-up the log data transmitted from the internal memory to the external memory and to store the backup data, and a controller configured to transmit the backup data stored in the backup memory to the external memory by controlling the backup memory when the PLC is turned off or reset.

Abstract: Provided is a molded case circuit breaker including a front space, a rear space divided from the front space, a fixed contact unit provided on one side of the front space and in electric contact with one of a power supply and a load, a movable contact unit installed in the front space to be movable and in contact with the fixed contact unit, a switching device installed in the rear space and operating to allow the movable contact unit to be in selective contact with the fixed contact unit, an operation device installed in the front space and the rear space and transferring the movable contact unit according to operation of the switching device, an arc extinguishment chamber installed on the one side of the front space and extinguishing an arc induced while the fixed contact unit is being separated from the movable contact unit, and a barrier preventing backward movement of the arc from at least one position of a moving way of the movable contact unit, the position separate from the fixed contact unit.

Abstract: The battery control circuit includes: a battery; a DC power supply unit; a first DC-DC converter providing a current path in a first direction of supplying the DC energy from the DC power supply unit to the battery, and a current path in a second direction of discharging the DC energy in the battery to a ground; a first capacitor fully discharging the battery in a manner that the sum of a voltage across the first capacitor and a voltage across the flow battery to be higher than an output voltage of the first DC-DC converter; a second DC-DC converter supplying the DC energy from the DC power supply unit to the first capacitor; and a controller controlling the first DC-DC converter to form the current flow path in the second direction when a number of times of charging and discharging the flow battery reaches a preset number.

Abstract: In present disclosure, a movable bar guide portion is formed to protrude toward a movable bar in a shaft having a movable bar, and when a fault current is applied and the movable bar is rotated due to electromagnetic repulsion force, the movable bar and the movable bar guide portion contact each other, and thus, when the movable bar is rotated through the movable guide portion, movement of a rotation center of the movable bar is minimized.

Abstract: An adjustable thermal trip mechanism for a circuit breaker is provided which can improve the reliability of over-current tripping by minimizing an influence upon thermal tripping even if an assembly error such as skewing or twisting occurs during assembly of bimetallic strips. The adjustable thermal trip mechanism for the circuit breaker comprises: a crossbar that is rotatable and has at least one power receiving portion for receiving rotary power; a bimetallic strip that can bend towards the power receiving portion when an over current occurs on the circuit; and an adjustment screw installed to face the power receiving portion, wherein the power receiving portion comprises a plurality of planar portions which are at different distances from the adjustment screw.

Abstract: An apparatus for balancing a voltage of a direct current (DC) link capacitor of an inverter is provided. The apparatus of the present disclosure includes a switching unit connected to a node (a reference point) between the first and second resistors, which are connected in series to each other, and a node (a neutral point) between the first and second capacitors, which are connected in series to each other, and configured to short and open between the reference point and the neutral point, and a control unit configured to control the switching unit to short between the reference point and the neutral point when a voltage of the reference point (a reference point voltage) and a voltage of the neutral point (a neutral point voltage) are different from each other.

Abstract: Disclosed herein are a PLC high speed counter and an operating method thereof. The PLC high speed counter includes: an input circuit configured to convert and output a high-speed pulse train input from an encoder into a CMOS level; a micro processor unit configured to receive the pulse train from the input circuit, generate a count value by counting the pulse train in a linear count manner and calculate a current ring count value based on the count value; and a buffer configured to receive the count value from the micro processor unit and store the same as a current linear count value, wherein, when a current value request is received from an external device, the micro processor unit determines an operation mode and transmits, if the operation mode is a ring counter mode, the current ring count value.

Abstract: The present disclosure relates to an automatic train operation system in railway vehicles, the system including: a speed profile generation unit configured to generate speed profile information based on limited speed profile inputted from outside; a track database stored with track gradient information and track curvature information for each track segment; a train speed controller configured to control a speed of the train using a current position, a current speed and the speed profile information of the train inputted from outside; and a propulsion system fault diagnosis unit configured to diagnose a fault status of the propulsion system based on the current speed of the train, the track gradient information, the track curvature information and propulsion notch information inputted from the train speed controller, and to calculate a performance depreciation ratio when the propulsion system is faulted and to provide the performance depreciation ratio to the train speed controller.

Abstract: Disclosed are an apparatus and a method for controlling a signal such that a PLC input signal is equalized to a reference input signal. The apparatus includes an error calculation unit to calculate an error by using the PLC input signal and the reference input signal; an estimation parameter calculation unit to calculate an estimation parameter by using the reference input signal, the PLC input signal and the error; and an error correction unit to correct the error by using the estimation parameter such that the PLC input signal is equalized to the reference input signal.

Abstract: There is provided a neutral pole transformer module for a circuit breaker capable of minimizing an influence of external noise, detecting a neutral pole current at low manufacturing cost, and detecting a neutral pole current without modifying a configuration of an existing overcurrent relay or without installing an additional component in the existing overcurrent relay. The neutral pole transformer module for a circuit breaker comprises a ZCT configured to allow a transmission line of a neutral pole detection current output from the current transformer to pass therethrough and to provide a secondary output current signal obtained by reducing the neutral pole detection current in a predetermined ratio; a printed circuit board configured to convert the secondary output current signal into a voltage signal, and to differentiate the converted voltage signal and output the same; and an enclosure formed of an electrical insulator and enclosing the ZCT and the PCB.

Abstract: In an embodiment, an offset voltage generator includes a first limiter configured to compare a first phase-voltage signal with a maximum limit value and a minimum limit value to output a first limit-voltage signal; a second limiter configured to compare a second phase-voltage signal with the maximum limit value and the minimum limit value to output a second limit-voltage signal; a third limiter configured to compare a third phase-voltage signal with the maximum limit value and the minimum limit value to output a third limit-voltage signal; and a summer configured to add a difference between the first phase-voltage signal and the first limit-voltage signal, a difference between the second phase-voltage signal and the second limit-voltage signal, and a difference between the third phase-voltage signal and the third limit-voltage signal, to output an offset voltage.

Abstract: A telemetry system includes: a plurality of meters; a data reader configured to acquire meter reading information for each of the meters; a transmitter configured to receive the meter reading information for each of the meters acquired through the data reader and transmit a corresponding Bluetooth beacon signal; a receiver configured to receive transmission information from the transmitter; and a meter reading server configured to manage the meter reading information for each of the meters based on the transmission information received through the receiver.

Abstract: In some embodiments, an inverter control apparatus and a method for controlling the same are provided. The inverter control apparatus may speed up the discharging of the residual energy at an inverter driven with an input power when a safety signal is input to the inverter. The inverter control apparatus may include an input power switchgear supplying an input power to the inverter according to switching operation; an I/O unit inputting a safety signal to the inverter according to a user control input and outputting a failure output relay signal to the input power switchgear when the safety signal is generated; and a controller performing speeding up the discharge of residual energy at the inverter when the input power is interrupted.

Abstract: A control circuit for an electric leakage circuit breaker, capable of preventing an error in determining an electric leakage generation due to an offset voltage of an input amplifier, including, a zero phase current transformer configured to detect a zero phase current on a circuit as a leakage detection signal, a filter circuit section configured to remove a high frequency noise included in the leakage detection signal, an input amplifier configured to a voltage formed by a current of the leakage detection signal and an impedance of the filter circuit section, and includes a pair of transistors, a base current generator commonly connected to the bases of the pair of transistors and configured to supply the same amount of base current to the pair of transistors, and a trip determination circuit section configured to determine whether to output a trip control signal.

Abstract: A control device for a static var compensator (SVC) includes: a monitoring control unit configured to generate an error presence/absence signal based on a control signal inputted from a system controller; a valve signal processing unit configured to generate a valve state signal based on databack signals respectively inputted from a plurality of valves; a CPU control unit configured to generate a state information signal based on the error presence/absence signal and the valve state signal; and a firing signal output control unit configured to generate a firing signal according to the state information signal.

Abstract: The present invention provides a trip control circuit for a circuit breaker capable of breaking a circuit when a fault current occurs due to a DC current component, as well as an AC current. The trip control circuit comprises a current transformer that has a core allowing a circuit to pass through and a secondary coil for detecting a current flowing on the circuit and providing a current detection signal; an oscillation circuit section that configured to apply an electrical signal to the secondary coil to increase a slope of a hysteresis loop of the current transformer to allow the secondary coil to detect a DC current and an AC current; and a trip determining circuit section that configured to compare a current value indicated by the current detection signal with a predetermined reference current value.