Abstract: The present invention relates to a method for controlling an inverter to prevent an unnecessary fan trip. The method includes: receiving a fan current; when the fan current is above a high trip level or is below a low trip level, incrementing an error count; when the error count reaches an error count maximum value, incrementing a trip count and initializing the error count; and when the trip count reaches a trip count maximum value, generating a fan trip signal.

Abstract: The present invention relates to an arc ventilation system of a multi-stage distributing board, and more particularly, to an arc ventilation system of a multi-stage distributing board having an arc ventilation detour path, capable of preventing an arc generated in a lower compartment from damaging an upper compartment. The arc ventilation system of a multi-stage distributing board according to an embodiment of the present invention includes a first compartment provided at a first stage of an enclosure of the distributing board, a second compartment provided at a second stage located above the first stage, a side arc ventilation compartment provided at one side of the first compartment and the second compartment, and a middle arc induction compartment provided between the first compartment and the second compartment and communicating with the side arc ventilation compartment.

Abstract: An interlock apparatus according to embodiments is configured to block an operation of a third circuit breaker while a first circuit breaker and a second circuit breaker operate and include a mover and a rotator. The mover include a first connector connected to the first circuit breaker, a second connector connected to the second circuit breaker, and a central part disposed between the first connector and the second connector and is rectilinearly moved along one direction in response to operations of the first circuit breaker and the second circuit breaker. The rotator include a first engagement part engaged with to the third circuit breaker and a second engagement part engaged with the central part and be rotated around a shaft passing through the first engagement part.

Abstract: Disclosed is a method for controlling an inverter. The method includes detecting an output current from an inverter to determine a software over-current suppression (S/W OCS) level according to an output frequency of the output current.

Abstract: The present disclosure relates to a 3-phase undervoltage trip device capable of automatically tripping a circuit breaker based on an under-voltage of a 3-phase line voltage, including lines to which a 3-phase power is applied. The undervoltage trip device is connected to lines to which a 3-phase power is applied and configured to operate to automatically trip a circuit breaker when an open phase condition occurs on any one of three phases of the power. As the undervoltage trip device automatically trips the circuit breaker when the open phase condition occurs on any one of three phase, occurrence of the open phase condition due to disconnection or an accident on the line may be easily detected.

Abstract: Disclosed herein is a pole component assembly for a circuit breaker. The pole component assembly for a circuit breaker includes an external insulating housing made by injecting resin into a housing mold, applying injection pressure to mold the injected resin, and separating the molded resin from the housing mold, and a circuit breaker portion assembly detachably inserted into the external insulating housing after the external insulating housing is made. According to embodiments of the present disclosure, the external insulating housing is molded without a main circuit breaker component when manufacturing a sealed type pole component, and the main circuit breaker component is assembled into the finished external insulating housing, thereby preventing the main circuit breaker component from being contaminated or damaged.

Abstract: According to an embodiment of the present invention, there is provided a switchgear including: a fixed electrode which is disposed inside a cabinet; a movable electrode which is provided corresponding to the fixed electrode and rotates between a first position which comes in contact with the fixed electrode and a second position which is separated from the fixed electrode; a pedal which is disposed on the outside of the cabinet and guided in the vertical direction along a guide hole formed long in the cabinet in the vertical direction; a connecting rod which is rotatably connected to the pedal; and a hammer which is connected to the connecting rod and rotates together with the connecting rod to strike the movable electrode positioned at the first position.

Abstract: An apparatus for controlling an inverter includes a volatile, first storage part; a nonvolatile, second storage part; and a control part configured to store data related to the status of the inverter in the first storage part when the inverter is driven and configured to select some of the data stored in the first storage part depending on the type of failure event when a failure event occurs and store the selected data in the second storage part.

Abstract: The inverter includes an inverting module including a plurality of switching elements, wherein the inverting module are configured for receiving a direct current (DC) stage voltage and for generating an output voltage of three-phases via switching of the switching elements. The device includes: a command voltage outputting unit configured for providing a pulse width modulation (PWM) control signal corresponding to an initial command voltage to the switching elements of the inverting module when the initial command voltage is within a voltage limit; a modulation index modifying unit configured for modifying a modulation index of the initial command voltage when the initial command voltage is outside the voltage limit; and an overmodulated command voltage generation unit configured for modifying the initial command voltage using the modified modulation index to form a modified command voltage and for limiting the modified command voltage to the voltage limit to generate an overmodulated command voltage.

Abstract: The present disclosure relates to an apparatus for managing local monitoring data. The apparatus for managing local monitoring data includes an identification unit configured to identify monitoring data as one of structured monitoring data and unstructured monitoring data using flag information of the monitoring data, a storage unit configured to store structured monitoring data in a relational database or unstructured monitoring data in an unstructured database on the basis of an identification result of the monitoring data, and a conversion unit configured to search structured monitoring data corresponding to a data conversion condition among the structured monitoring data to convert the searched structured monitoring data into unstructured monitoring data.

Abstract: An apparatus for detecting a fault in a power relay of an inverter is disclosed. The apparatus for detecting a fault in a power relay includes: a voltage sensor configured to measure a voltage of a DC link; a current sensor configured to measure an output current applied to an inverter stage; a storage unit configured to store resistance of an initial charge resistor, a time constant of a capacitor, and a reference voltage measured when voltage drop of the DC link does not occur; and a controller configured to determine, when the voltage drop of the DC link occurs, the presence or absence of a fault in the power relay based on a difference between the reference voltage and a voltage measured after lapse of a period corresponding to the time constant.

Abstract: Disclosed embodiments relate to a power monitoring system that may include an external power supply source, an energy storage system and a distribution board. In some embodiments, the power monitoring system includes the external power supply source, the distribution board, the energy storage system, a first power metering device, a second power metering device, a third power metering device and a server.

Abstract: An execution code of a user program applicable to a PLC is fitted and arranged to an adequate block among memory blocks of variable sizes, and execution order and position information of each execution code are downloaded to the PLC along with recorded execution table. A CPU module of PLC sequentially executes each execution code randomly arranged on a memory with reference to the execution table. Because an execution code is loaded on a memory block having respectively different sizes such as N, 2N and 4N, utilization of non-use space can be improved over a conventional allocation method of fixed size. An execution table is utilized to discontinuously configure a program execution area, whereby a user program can be easily modified or added during PLC operation.

Abstract: The present disclosure provides a method for controlling driving of a motor by a Programmable Logic Controller (PLC). In one embodiment, the method includes: upon an initiation of an N-th position determination control period, stopping a scan program being executed; receiving one or more motor driving commands for one or more axes during a preset position control processing region; calculating one or more axis-based motor movement amounts corresponding to the one or more motor driving commands for the one or more axes during a preset position control calculation region; resuming execution of the scan program; and upon an initiation of a (N+1)-th position determination control period, driving the motor based on the one or more axis-based motor movement amounts calculated during the position control calculation region.

Abstract: The present disclosure relates to a device of monitoring a reactive power compensation system to compensate reactive power, the device including a measurement unit configured to acquire voltage data, current data, and a phase angle from each constituent device, a power performance index calculation unit configured to calculate power performance index data including at least one of power factor data, flicker data, and harmonics data based on the acquired voltage data, current data, and phase angle, and a controller configured to analyze and evaluate the calculated power performance index data based on a preset situation.

Abstract: An electric power equipment comprises: a display module; a sensor module for outputting measurement data including a first noise signal measured from inside of the electric power equipment, a second noise signal measured from outside of the electric power equipment, a temperature signal of the electric power equipment, and a humidity signal of the electric power equipment; and a control module for diagnosing whether a partial discharge has occurred based on the measurement data, wherein the control module includes: a determination unit for determining whether a signal magnitude of the first noise signal is within a preset first reference range; an analysis unit for diagnosing an occurrence of the partial discharge, and for analyzing the signals according to the analysis algorithm; and a control unit for controlling a result information of the analyzing, and a maintenance and repair information, to be displayed.

Abstract: The present disclosure relates to a CPU module for processing railway signals. The CPU module includes a first input unit that receives an input signal from an external apparatus; a second input unit that receives a second input signal and a second instruction signal from a CPU checking module; a first comparison unit that compares the two input signals and outputs a resulting input signal if it is determined that the two signals are identical; a signal processing unit that converts the resulting input signal into a first instruction signal; and a second comparison unit that compares the first instruction signal with the second instruction signal and outputs a resulting instruction signal if it determines the two instruction signals are identical; and a control unit that sends a synchronization signal for controlling operation timing of the two comparison units, the signal processing unit, and the CPU checking module.

Abstract: An energy management server includes a controller configured to process first data collected from a power system into a second data; a memory database unit configured to classify the second data into dynamic data and static data according to an established data classification to store the dynamic and static data; and a duplex controller configured to selectively receive the first data and the dynamic data or the static data to synchronize with another energy management server.

Abstract: A device and method for controlling an inverter is disclosed. The inverter-controlling device in accordance with the present disclosure determines an operation state of a switching element of an initial charging module based on predetermined time durations and a magnitude of a DC link voltage measured at each of time points corresponding to the predetermined time durations.

Abstract: The present invention relates to an isolation mechanism of a controller for a direct current circuit breaker, which has a simple structure for isolation and connection manipulation. The isolation mechanism of a controller for a circuit breaker comprises a first connector that has a plurality of output terminals electrically connected to the controller and a plurality of input terminals detached from the output terminals for connecting an input electric power source; and a second connector that has a first connection position connected to the first connector and a second connection position rotated at 180° from the first connection position and connected to the first connector, and has a conductor wiring portion electrically connecting the output terminals with the input terminals at the first connection position and electrically disconnecting the output terminals from the input terminals at the second connection position.