公开(公告)号：US11726144B2

公开(公告)日：2023-08-15

申请号：US16497653

申请日：2019-09-20

Applicant: KOREA WATER RESOURCES CORPORATION

Inventor： Song Yop Han ,  Jeong Woo Lee ,  Kwang Ho Lee

IPC: G01R31/52 ,  G01R19/165 ,  H02H9/04

CPC classification number: G01R31/52 ,  G01R19/16571 ,  H02H9/04

Abstract: The present invention performs a reference point detecting step (S20) to select a reference point by performing pattern analysis based on a characteristic pattern shown in a total leakage current (IT) when an applied voltage is 0V, a resistive leakage current calculating step (S30) to calculate a resistive leakage current by Fourier series-expanding the total leakage current (IT) starting at the reference point, and reference point verifying/correcting steps (S40 and S41) to correct the reference point until a characteristic pattern of the resistive leakage current (IR) according to non-linear resistance characteristics of the surge arrester (1) is shown so that the resistive leakage current (IR) is recalculated, and the present invention determines that the resistive leakage current (IR) calculated based on the completely corrected reference point is the resistive leakage current of the surge arrester (1).