Abstract: Disclosed are an apparatus for correcting an error of acquired data and a method thereof. The method includes determining whether states of at least one circuit breaker and at least one disconnecting switch included in at least one station are consistent with each other based on data received from at least one remote control apparatus including the at least one station; assigning a weight to a corresponding circuit breaker and a corresponding disconnecting switch and the station including the corresponding circuit breaker and the corresponding disconnecting switch when the determination result represents that the states of the circuit breaker and the disconnecting switch are inconsistent with each other; creating alarm information notifying a malfunction of the corresponding circuit breaker and the corresponding disconnecting switch when an accumulated weight value is equal to or greater than a preset reference weight value; and outputting an alarm corresponding to the alarm information.

Abstract: Provided is a method for controlling an inverter, the method comprising calculating an optimal speed, determining a final speed as the optimal speed when a command speed is higher than a rated speed level of a motor, and determining the final speed as the command speed when the command speed is lower than or equal to the rated speed level, or higher than a predetermined optimal speed level.

Abstract: An exemplary embodiment of the present disclosure includes a medium voltage inverter control apparatus and a medium voltage inverter system using the same. The medium voltage inverter control apparatus determines input voltage information by receiving an input voltage of a medium voltage inverter, compares an output command of the medium voltage inverter with an output of a first PLL unit to output a difference therebetween, and synchronizes the output command of the medium voltage inverter using the difference.

Abstract: An exemplary embodiment of the present disclosure includes an apparatus for discharging DC-link capacitor for electric vehicle charger. In a case the apparatus operates abnormally, operations of a rectifier, a boost PFC circuit and a DC-DC converter are discontinued, and the apparatus receives the power source charged in the DC-link capacitor through the auxiliary power supply unit to thereby perform a control operation.

Abstract: A method for controlling an inverter in a system including a load, a motor for driving the load, and an inverter for operating the motor comprises when a load amount of the load is reduced to below a sleep level, checking whether a time corresponding to a sleep delay has lapsed; when the load amount of the load is still below the sleep level even after the sleep delay, varying an operating frequency of the motor, and if there is no change in a feedback from the load in response to the variation in the operating frequency, controlling the inverter to enter a sleep mode.

Abstract: Provided is an analog input and output module, the module comprising a first signal processing unit configured to separate analog signal inputted from a plurality of HART transmitters from first HART data, convert the analog signal to digital data, transmit the first HART data to a second signal processing unit, and transmit second HART data received from the second signal processing unit to at least one of the plurality of HART transmitters; and the second signal processing unit configured to control the first signal processing unit and storing conversion result.

Abstract: Disclosed are an apparatus and a method for managing alarms based on state information received from systems. The method includes receiving alarms including state information of a remote control system; displaying an alarm queue including at least one of the received alarms; setting important alarms from among the alarms displayed in the alarm queue; and deleting the important alarm from the alarm queue when a user confirms the important alarm or a signal notifying a recovery to a normal state of a system corresponding to the important alarm is received.

Abstract: A track circuit apparatus for a train, the track circuit apparatus includes: a ground-based transmitter that is installed corresponding to each of a plurality of block sections divided from a track circuit formed by rails, digitally modulates transmission data by a carrier frequency predetermined and common for each of the block sections, assigns different pseudo random noise (PN) codes to adjacent block sections, and modulates and transmits the data; and a ground-based receiver or an on-train receiver that demodulates received data corresponding to a block section based on the carrier frequency of one of reception signals received from the block section and the PN code assigned to the block section.

Abstract: Provided is a shortage voltage trip device of a molded case circuit breaker. In the molded case circuit breaker, driving current applied into a trip driving part is reduced in proportion to reduction of a power applied into a circuit. When the voltage applied into the circuit is greater than a rated voltage, the trip driving part is stopped, and an operation of a trip driving mechanism is restricted by a trip lever. When the voltage applied into the circuit is less than the rated voltage, the trip driving part is operated, and the restriction of the trip driving mechanism is released by the trip lever rotated by being linked with the operation of the trip driving part. Thus, the circuit may be more simply switched, and operation reliability of a product may be improved. Also, the product may have a more simplified structure.

Abstract: A control apparatus for regenerative medium voltage inverter is disclosed. The control apparatus controls a switching of a PWM converter unit by generating a voltage compensating a power difference between an input and an output of the PWM converter unit.

Abstract: Provided is a DC power relay. The DC power relay includes a pair of fixed contacts disposed parallel to each other, a movable contact vertically movable with respect to the pair of fixed contacts, the movable contact being in connect with or being separated from the pair of fixed contacts, a pair of permanent magnets for guide an arc generated when the movable contact is in contact with or is separated from the pair of fixed contacts to the outside, and a damping magnet reducing a force generated in a direction in which the movable contact is separated from the fixed contacts when the movable contact is in contact with the fixed contacts.

Abstract: A circuit breaker having a mechanical trip mechanism enabling a circuit breaker to perform an emergency manual trip operation is provided. The circuit breaker includes: a fixed contactor connected to a circuit; a movable contactor movable to a closed state in which the movable contactor is in contact with the fixed contactor and a broken state in which the movable contactor is separated from the fixed contactor, an opening and closing mechanism configured to convert a rotational motion of a plurality of links and a rotational shaft to enable the movable contactor to be brought into contact with the fixed contactor or separated therefrom; a trip latch locked to or unlocked from a main link provided in the opening and closing mechanism; and an OFF button configured to rotate the trip latch to unlock the trip latch from the main link when manually pressed.

Abstract: The present disclosure relates to an electronic power meter and a method for storing data thereof. The electronic power meter includes a communication unit that receives a critical peak pricing rate data, a memory that stores first metering data corresponding to the critical peak pricing rate data received via the communication unit, and second metering data corresponding to a predetermined varying pricing rate data, the memory storing the first metering data and the second metering data into different storage areas respectively, and a controller that calculates metering data by applying a corresponding rate for each time slot according to the varying pricing rate or the critical peak pricing rate.

Abstract: Disclosed is an apparatus for controlling an IPMSM, the apparatus according to exemplary embodiments of the present disclosure including a first generating unit generating a q-axis reference voltage of a synchronous reference frame from a reference frequency, a current converter generating a current of the synchronous reference frame from a 3-phase current of the IPMSM, and a voltage controller generating a d-axis reference voltage compensating a voltage in response to a load change.

Abstract: An apparatus and a method for processing project information for a cross-platform environment in an automation system field are provided. In the apparatus for processing project information according to an embodiment, a web server receives a request signal for project information from a client and transmits projection information corresponding to the request signal. A project server collects heterogeneous data transmitted from an automation system, converts the collected heterogeneous data into data in a predetermined format for transmitting to the client, and outputs the converted data to the client via the web server.

Abstract: A method for establishing an Ethernet communication link of a digital protective relay having at least two communication ports, includes: configuring physical layers of a first communication port and a second communication port; determining whether or not auto-negotiation with respect to the first communication port or the second communication port is successful; and replacing configuration information regarding one of physical layers of the first communication port and the second communication port with configuration information regarding the other of the physical layers of the first communication port and the second communication port according to whether or not the auto-negotiation with respect to the first communication port and the second communication port has been successful. Although Ethernet ports of the digital protective relay are connected without priority, the digital protective relay may perform the same operation.

Abstract: Disclosed is an apparatus and method for detecting failure of a switching device in an inverter, the method including detecting a maximum value and a minimum value of a phase current inputted into a motor from synchronous angle information of the motor through a switching device in a predetermined leg of the inverter unit, and detecting failure of the switching device of the leg through an asymmetry ratio of the phase current.

Abstract: An actuator according to the present disclosure comprises: a disconnecting switch drive shaft; a first drive gear axially coupled to the drive shaft; a first follower gear in engagement with the first drive gear; a first drive disc having a first drive roller; a first rotary shaft axially supporting the first follower gear and the first drive disc; an earthing switch drive shaft; a second drive gear axially coupled to the earthing switch drive shaft; a second follower gear in engagement with the second drive gear; a second drive disc having a second drive roller; a second rotary shaft; a zeneva disc having a pair of groove portions which the first drive roller or the second drive roller is inserted into or separated from; and a main shaft for switching the disconnecting switch or the earthing switch in accordance with the rotation of the zeneva disc.

Abstract: Provided is an apparatus for charging battery in electric vehicle that includes a DC-DC converter unit formed in two channels for converting a charge of the low voltage battery to a power source by receiving a power source from the high voltage battery.

Abstract: A method of controlling a multilevel converter is provided. In the method of controlling a multilevel converter according to an embodiment, a sub-module having the maximum voltage and a sub-module having the minimum voltage respectively are extracted from among a plurality of sub-modules. An amount of state variation of each of the plurality of sub-modules is determined. When the amount of state variation is not determined to be 0, a direction of a current flowing through the plurality of sub-modules is detected. A subsequent state of at least one sub-module is determined according to at least one of the amount of the state variation and current direction. Subsequently an arrangement time for sub-module values can be efficiently reduced while the number of the sub-modules increases in the voltage balancing.