Abstract: A monostable permanent magnetic actuator using a laminated steel core, comprises: lamination cores formed as a plurality of metallic thin plates are laminated to each other; a coil disposed to be adjacent to the lamination cores, and configured to apply a magnetic force to the lamination cores by an external power; a mover mounted in the lamination cores so as to be movable in upper and lower directions; permanent magnets installed at the lamination cores, and configured to apply an upward and downward magnetic force to the mover; and an elastic means configured to apply an elastic force to the mover in an opposite direction to the permanent magnets.

Abstract: A relay comprises: a solenoid; a hermetically sealed chamber mounted at a lower end thereof with a cylinder into which a center portion of the spool is inserted, mounted at an upper end thereof with a pair of stationary terminals each provided at a stationary contact point and filled therein with insulating gas to be coupled at an upper portion of the spool; an insulation member insulating the chamber and the stationary terminals; a movable unit including a shaft, a conductive movable terminal, and a pair of movable contact points; a restoring spring to pull the shaft toward the lower surface of the cylinder; and an insulated sliding guide to guide the movable unit that is moved by the solenoid and the restoring spring.

Abstract: The present disclosure relates to a fault current limiter, comprising: a trigger device dividing a fault current to a path on which a normal current flows and to a path on which the fault current flows when the fault current is generated; a first switch connected in series to a rear end of the trigger device; a fixation unit for fixing an open/close state of the first switch; a driver for opening a contact point contacted by the first switch by repulsive force generated by the fault current in a case the fault current divided by the trigger device is inputted; and a control module for driving the fixation unit in order to fix the open/close state of the first switch in a case the fault current is generated.

Abstract: A circuit breaker having an automatic release linkage is disclosed that is capable of preventing damage and deformation of elements by automatic linkage release before electro-impulsive force generated from within the circuit breaker by a large short-circuit current causes the damage and deformation of open/close linkage.

Abstract: Disclosed is a withdrawable device of main circuit for a circuit breaker. A ring-shaped guide recess is formed at a central part of a transfer nut screw-coupled to a lead screw, and supporting surfaces are formed on side surfaces of the guide recess. And, rotation prevention pins are elastically supported by springs in a moving direction of the transfer nut, and are selectively locked, thereby allowing the transfer nut to perform an idle operation. Accordingly, a structure for an idle operation of the transfer nut is simplified, and the number of components is reduced. An axial load is attenuated to a plane-contact distributed load, not a point-contact concentrated load, thereby preventing damage of the components. Also, a vacuum circuit breaker has enhanced reliability of the idle operation at a run position and a test position.

Abstract: A movable contactor for an air circuit breaker with a contact spring protecting mechanism is provided, the movable contactor comprising a shielding plate configured to shield exposed surfaces of the contact springs for protection so as to prevent a deterioration or performance degradation in the contact springs due to arcs.

Abstract: Disclosed is an interlock apparatus for a move-out type circuit breaker, capable of automatically discharging elastic energy charged in a closing spring and a trip spring when a main body of the circuit breaker is moved-in or moved-out, the apparatus including, a releasing protrusion member fixed to a predetermined position on a path that the circuit breaker is moved-in or moved-out and protruded upwardly from the predetermined position, an automatic releasing mechanism configured to be moved up by coming in contact with the releasing protrusion member upon moved-in or moved-out the circuit breaker to thereby drive a latching mechanism for latching the closing spring and the trip spring in a charged state to the release position.

Abstract: The present disclosure relates to an energy management system (EMS) and a method using the same, wherein the EMS comprises, a communication module receiving a channel information of a high voltage direct current (HVDC) system via a network; a circuit realization unit obtaining a connection information among constituent elements symbolizing the constituent elements among each node in electrical symbols by sequentially following pre-set nodes of the HVDC system, and forming the HVDC system by connecting the symbolized constituent elements using electrical lines by using the channel information of HVDC system received by the communication module; a system analyzing unit analyzing an operation mode of the HVDC system through the connection information among the constituent elements of the HVDC system obtained by the circuit realization unit; and a controller managing and controlling the HVDC system by giving an energy management command in response to the operation mode analyzed by the system analyzing unit.

Abstract: An apparatus for processing digital input signals transferred from a plurality of circuit breakers includes: a plurality of signal input terminals configured to receive a plurality of digital input signals, which are generated from the plurality of circuit breakers and indicate an ON/OFF state of the plurality of circuit breakers, in parallel; a digital input signal parallel-to-serial converting unit configured to convert the parallel digital input signals from the plurality of signal input terminals into serial digital input signals, and output the converted serial digital input signals according to a control signal; and a controller configured to receive and process the serial digital input signals transferred from the digital input signal parallel-to-serial converting unit, and transmit the control signal to the digital input signal parallel-to-serial converting unit.

Abstract: Disclosed are an elastic pressing unit and a molded case circuit breaker having the same, the molded case circuit breaker including, a plurality of fixed contacts, a plurality of movable contacts disposed to be rotatable between a closing position contacted with the corresponding fixed contacts and a breaking position or trip position separated from the corresponding fixed contacts, a rotation pin disposed to be simultaneously connected to the movable contacts, a mechanical unit connected to the rotation pin so as to allow the movable contacts to be simultaneously rotatable, and an elastic pressing unit configured to apply an elastic force to the rotation pin such that the rotation pin is rotated toward the closing position, whereby component deformation can be prevented, resulting in ensuring operation reliability and stability of the mechanical unit.

Abstract: The present invention relates to a multilevel inverter comprising: a converter unit converting an inputted AC power source to a direct current (DC) power source; a film capacitor rectifying the DC power source converted by the converter unit; an inverter unit converting the rectified DC power source to a three-phase current in response to a pulse width modulation (PWM) control signal and outputting the current; a current detector detecting a current outputted from the inverter unit; a power cell main controller generating a voltage instruction and a voltage instruction using the detected current; and a PWM controller generating the pulse width modulation (PWM) control signal using the voltage instruction and frequency instruction.

Abstract: Disclosed is a discharging control apparatus of a switching device for an inverter capable of reducing a spike voltage when the switching device is turned off and reducing a turn-off time of the switching device, the apparatus comprising, a fast discharge circuit section configured to provide a discharging path through which a gate voltage of the switching device is fast discharged at a first discharging speed, an idle discharge circuit section configured to provide a discharging path through which the gate voltage of the switching device is idly discharged at a second discharging speed slower than the first discharging speed, and a spike voltage reduction controller configured to control such that the gate voltage is discharged simultaneously via the fast discharge circuit section and the idle discharge circuit section, when the switching device is turned off in the state that a normal current flows in the switching device, so as to reduce a spike voltage and simultaneously fast turn the switching device off

Abstract: A conductor base coupled to a finger module of an air circuit breaker. Since the connector of the conductor base has the curved surface formed on a side of an end portion thereof and tooth-coupled with the contactor of the finger module, the contactor of the finger module has another curved surface corresponding to the curved surface of the connector and the contactor is elastically supported in a vertical direction by the plate spring to allow both end portions of the contactor to perform a vertical elastic movement relative to a longitudinal center of the contactor. The present invention can prevent damages due to a mechanical impact between the connector of the conductor base and the contactor of the finger module, which may occur while the breaker terminal is inserted into the finger module, to thereby extend the lifespan of the conductor base and the finger module.

Abstract: Disclosed is a circuit breaker having a cam rotation delaying function employed to block current, the circuit breaker performing a charging operation and a charting operation, the circuit breaker including a closing spring having one end portion rotatably coupled to each of plates, a driving lever rotatably installed at each of the plates and connected to another end portion of the closing spring so as to be rotated responsive to compression and extension of the closing spring, a cam rotatably installed at each of the plates and configured to press the driving lever for rotation, a link mechanism having a plurality of links rotatably installed at each of the plates and connected to the driving lever for operation, a movable contact rotatably installed at a side of each of the plates and contactable with a terminal by an operation of the link mechanism, and a cam delaying mechanism installed at each of the plates and configured to attenuate a rotational force of the cam due to a restoring force of the closing

Abstract: Disclosed is an arc extinguishing device of circuit breaker for manual motor starter capable of swiftly extinguishing and discharging an arc generated by a fault current flowing into a motor circuit during an interruption operation of a circuit breaker, thereby enhancing the performance of interruption.

Abstract: The present disclosure is related to a peak current limiting apparatus of the present disclosure comprising a trigger element serially connected between a power supply source and the load, diverting a fault current to other paths connected in parallel when the fault current exceeding a threshold is generated, a main contact switch serially connected between the trigger element and a load, a driving coil connected in parallel with the trigger element, and generating a repulsive force in response to the fault current to detach a contact point of the main contact switch, and a peak limiting impedance element serially connected between a connection node between the trigger element and the main contact switch and the driving coil, and limiting a first peak level of the fault current flowing through the driving coil to a predetermined level.

Abstract: Disclosed is a motor of spring charging device in air circuit breaker wherein first and second frames are formed with glass fiber-added plastic material to facilitate the tight-fitting of a bearing and a manufacturing cost of driving motor is reduced by removing a brush holder isolator which was an essential part for isolating the brush holder, and a brush holder and a brush holder insertion hole of the first frame for inserting a brush holder are structurally improved to enable the brush holder to be easily and solidly inserted into the brush holder insertion hole of the first frame, thereby reducing the labor work of a soldering for connecting the stator winding.

Abstract: A time delay output apparatus for a circuit breaker includes a switch disposed at one side of a main shaft rotatable in directions to open/close a fixed contactor and a movable contactor, and a delay member disposed between the main shaft and the switch so as to operate the switch with a preset time delay, thereby simplifying the construction and reducing the size as well as enhancing operational reliability by stably obtaining a time delay.