公开(公告)号：US20210035764A1

公开(公告)日：2021-02-04

申请号：US16975528

申请日：2018-11-21

Applicant: LS ELECTRIC CO., LTD.

Inventor： Jaeshik YOON ,  Jaeyoung YU ,  Hyunyoung JUNG

IPC: H01H83/02 ,  G01R19/165 ,  G01R19/25

Abstract: The earth leakage circuit breaker of the present disclosure includes a leakage current detection unit outputting a leakage current detection signal; a conversion unit outputting the leakage current magnitude of a fundamental wave component, a ratio of a third harmonic component, and a ratio of a positive pole peak current value to a negative pole peak current value; and a control unit comparing the leakage current magnitude of a fundamental wave component, the ratio of a third harmonic component, and the ratio of a positive pole peak current value to a negative pole peak current value with predetermined reference values to determine whether a leakage current of the alternating current component is generated or a leakage current of the direct current component is generated and to thereby output a trip control signal when it is determined that the leakage current of the direct current or alternating current component is generated.

公开(公告)号：US20240353466A1

公开(公告)日：2024-10-24

申请号：US18683099

申请日：2022-10-12

Applicant: LS ELECTRIC CO., LTD.

Inventor： Jaeshik YOON

IPC: G01R31/12 ,  G01R19/00 ,  G01R19/165 ,  G01R27/02 ,  G01R31/28 ,  G01R31/52

CPC classification number: G01R31/1272 ,  G01R19/003 ,  G01R19/16576 ,  G01R27/025 ,  G01R31/2841 ,  G01R31/52

Abstract: An insulation monitoring device comprises a signal generation unit generating a measurement signal having a preset voltage and applying the measurement signal to the ground; a signal detection unit including a coupler resistor connected to a transmission line and a detection resistor provided between the coupler resistor and the other end of the signal generation unit, and detecting the voltage of the measurement signal distributed to the internal resistance of the insulation monitoring device according to the voltage difference across the detection resistor; and a control unit detecting a transient voltage, due to the charging and discharging of a system capacitor and generated by parasitic capacitance between the transmission line and ground, from the voltage detected by the signal detection unit, and checking the connection state of the insulation monitoring device to the transmission line and ground based on the result of detecting the transient voltage.