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51.发明授权公开(公告)号：US11233385B2
公开(公告)日：2022-01-25
申请号：US16966313
申请日：2018-11-21
Applicant: LS ELECTRIC CO., LTD.
Inventor： Seungjin Ham , Kihwan Oh , Jinyoung Park
Abstract: The present disclosure relates to an earth leakage breaker and an arc detection apparatus attachable/detachable to/from the earth leakage breaker. An earth leakage breaker and an arc detection apparatus according to one embodiment of the present disclosure comprise: a body of the earth leakage breaker; and an arc detection module attachably/detachably coupled to the body of the earth leakage breaker so as to detect an arc current, wherein the arc detection module comprises: an arc detection unit connected to a first load side terminal of the body of the earth leakage breaker so as to detect an arc current flowing through a line; a control unit for determining an arc current on the basis of an arc detection signal delivered by the arc detection unit; and an output unit for outputting a signal or a current, according to a control signal of the control unit.
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公开(公告)号：US20220014138A1
公开(公告)日：2022-01-13
申请号：US17293622
申请日：2019-08-07
Applicant: LS ELECTRIC CO., LTD.
Inventor： Seung-Cheol CHOI , Hak-Jun LEE
IPC: H02P27/08 , H02M7/5395 , H02P21/14
Abstract: The present disclosure provides an inverter control device which estimates back electromotive force of an induction motor, and which uses a torque current and a flux current so as to calculate a slip frequency and compensate for same, thereby enabling the motor to operate at a constant speed. To this end, the present invention may comprise: a command voltage generating unit for outputting, to an inverter, a three phase PWM voltage with respect to a command frequency on the basis of a voltage/frequency operation; and a slip frequency determining unit for determining a slip frequency on the basis of a phase current and a phase voltage of a motor driven by the inverter.
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公开(公告)号：US11211808B2
公开(公告)日：2021-12-28
申请号：US16960204
申请日：2019-01-11
Applicant: LS ELECTRIC CO., LTD.
Inventor： Sang-Ki Shon
Abstract: A photovoltaic apparatus according to an embodiment of the present invention may comprise: a photovoltaic cell array for generating electricity by using solar energy; a battery energy storage system for charging electric energy supplied from the photovoltaic cell array and discharging the charged electric energy to a system; and a processor for controlling a generated power amount to be supplied to the system on the basis of the generated power amount of the photovoltaic cell array and power consumption of the photovoltaic apparatus.
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公开(公告)号：US20210360810A1
公开(公告)日：2021-11-18
申请号：US17268803
申请日：2019-08-13
Applicant: LS ELECTRIC CO., LTD.
Inventor： Min-Jee KIM , Sang-Hoon LEE , Chae-Yoon BAE
IPC: H05K7/02
Abstract: The present disclosure relates to a tower-shaped support device comprising: a plurality of main frames arranged in a vertical direction on a mounting surface; a plurality of support frames which are coupled to the main frames in a direction that is vertical with respect to the main frame while the pair of frames facing each other are arranged at the same height, and which support at least one current limiting resistance unit module for limiting the fault current of a power system; and a lower frame and an upper frame respectively provided at the upper and lower sides of the main frame and grounded.
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公开(公告)号：US20210305980A1
公开(公告)日：2021-09-30
申请号：US17268307
申请日：2018-08-27
Inventor： Jungwook SIM , Suhyeong JANG , Sunghee KANG , Woonghyeob SONG , Seungki SUL , Donghoon PARK , Dongho SHIN
IPC: H03K17/687 , H02H3/087
Abstract: The present disclosure relates to a bidirectional semiconductor circuit breaker including a primary circuit unit connected between a power supply and a load and in which a first semiconductor switch and a second semiconductor switch are arranged in series and a snubber circuit unit of which one end is connected to the front end of the first semiconductor switch and the other end is connected to the rear end of the second semiconductor switch, in parallel. The snubber circuit unit includes a first circuit line, a second circuit line, and a third circuit line of which one end and the other end are connected to the first circuit line and the second circuit line, respectively, and in which a first resistor and a second resistor are arranged in series, and provide a snubber circuit which is applicable to a bidirectional fault current and satisfies semiconductor protection and current restraining performance.
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Patent Agency Ranking
公开(公告)号：US20210304926A1
公开(公告)日：2021-09-30
申请号：US17268733
申请日：2019-08-13
Applicant: LS ELECTRIC CO., LTD.
Inventor： Min-Jee KIM
Abstract: The present disclosure relates to a modular current limiting resistor comprising a plurality of plate resistors, wherein the plate resistors each comprise a pair of coupling pieces and a conducting line integrally formed with the coupling pieces and having a zigzag shape between the coupling pieces; a pair of support frames which support the stacked plate resistors; a plurality of coupling members which pass through one of the support frames, pass the coupling pieces, and are inserted into the plate resistors; a plurality of conductor rings disposed between the plate resistors while passing through and being inserted into the coupling members, and which electrically connect the conducting line on each of the plate resistors; and at least one unit module comprising a plurality of insulating rings disposed between the plate resistors while passing through and being inserted into the coupling members so as to insulate the plate resistors.
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公开(公告)号：US20210193421A1
公开(公告)日：2021-06-24
申请号：US17269213
申请日：2019-08-13
Applicant: LS ELECTRIC CO., LTD.
Inventor： Jungwoo YOO
Abstract: The present disclosure relates to a direct current relay, and more specifically, to a direct current relay having a movable assembly with improved contact pressure. The direct current relay according to an embodiment of the present disclosure comprises a pair of fixed contacts, and a movable contact which is moved vertically by an electromagnetic force to contact or be separated from the pair of fixed contacts, wherein an upper yoke and a lower yoke are respectively provided on the upper and lower portions of the movable contact, a contact spring is provided on the lower portion of the lower yoke, and the lower yoke is pressed by the contact spring to move the movable contact.
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公开(公告)号：US20210175031A1
公开(公告)日：2021-06-10
申请号：US17268658
申请日：2019-08-13
Applicant: LS ELECTRIC CO., LTD.
Inventor： Jungwoo YOO
Abstract: The present disclosure relates to a direct current relay having a mover assembly having improved contact pressure. In one embodiment, a direct current relay comprises a pair of fixed contactors and a movable contactor which is moved up and down by an actuator to come into contact with or be separated from the pair of fixed contactors, comprises: a mover support disposed below the movable contactor and connected to the actuator by a shaft; a mover holder disposed above the movable contactor and fixed to the mover support; an upper yoke and a lower yoke disposed above and below the movable contactor to generate an electromagnetic force, respectively; and a contact pressure spring disposed between the lower yoke and the mover support, wherein the upper yoke and the lower yoke form a magnetic path to offset an electron repulsive force generated between the fixed contactors and the movable contactor.
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公开(公告)号：US20210143643A1
公开(公告)日：2021-05-13
申请号：US16771973
申请日：2018-12-11
Applicant: LS ELECTRIC CO., LTD.
Inventor： Min-Jun PARK
Abstract: A grid voltage stabilization system according to an embodiment of the present invention comprises: a power generation device for generating power by using a new and renewable energy source, and supplying the generated power to a grid; an energy storage system (ESS) for, according to a command value, storing power generated in the power generation device in a battery, or supplying power stored in the battery to the grid in the form of active power and reactive power; and a power management system (PMS) for, when a voltage value of the grid is out of a reference range, controlling the magnitude of the reactive power to be supplied to the grid such that the command value is changed according to the voltage value of the grid to enable the voltage of the grid to be within the reference range.
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公开(公告)号：US20210028612A1
公开(公告)日：2021-01-28
申请号：US17043126
申请日：2019-01-14
Applicant: LS ELECTRIC CO., LTD.
Inventor： Ji-Ung KIM
Abstract: Disclosed are a self-power relay and a method for preventing a malfunction thereof. The self-power relay comprises: a self-power generation unit for autonomously generating a driving power by performing conversion into a preconfigured driving power level by using, as a source power, a system power of a transmission/distribution line or power system; and a relay operation unit, for measuring the amount of a system power of a transmission/distribution line or power system, blocking a system power transmitted to a load when a failure occurs, and monitoring a change in a source power of the self-power generation unit in real time, so as to stop a relay operation of the self-power generation unit and a relay operation of the relay operation unit itself when abnormality occurs, wherein a malfunction can be prevented by checking an unstable state of a source current and voltage for generation of a self driving power.
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