Insulation status monitoring Apparatus of power equipments and method

摘要

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an apparatus and method for monitoring an insulation condition of a power device. The present invention includes a detection sensor unit for detecting a signal related to an insulation state from a power device; A filter amplifying digital output unit for extracting a signal of a predetermined frequency band from the signals detected by the detection sensor unit and amplifying the signal, amplifying the digital signal, and outputting the digital signal; (Standard deviation (std), maximum value (max), minimum value (min), and a maximum value corresponding to the difference between the maximum value and the minimum value of the n received data d1 (n) received from the filter amplification digital output section (Mxmin) and kurt (kurt) of the received data dl (n), and calculates a value (mx1) of the upper side number set in advance from the received data dl (Mx4) corresponding to the number of data equal to or larger than the upper side count reference value (mx3, mx3 = max- (mxmin * mx1 / 100)) using the maximum value (max) (Mn3, mn3) using the preset lower-rank number% setting (mn1) value and the maximum-minimum difference (mxmin) value and the minimum value (min) calculated in the received data d1 the lower-side number calculation value mn4 corresponding to the number of data of mn3 = min + (mxmin * mn1 / 100) or less is calculated, (Xnr, xnr = mx4 / mn4, xnr = mx4 / mn4 in the embodiment of the present invention), which is a ratio of the upper side number calculation value mx4 to the lower side number calculation value mn4 (Condition a) in which the upper-side number calculation value mx4 is greater than a predetermined upper-side number reference value mx2, and a condition (Condition b) in which the lower-side number calculation value mn4 is greater than a predetermined lower-number reference value mn2 and the upper-lower-magnification calculation value xnr is greater than a predetermined upper-lower-number setting value xnrs (Condition a, condition b, and condition c) of the condition (condition c) that must be within the range of 1-xnrs to 1-xnrs to (1 + xnrs) If one of the three conditions is not satisfied, the S calculation function s_f, the maximum minimum difference mxmin and the standard deviation std are substituted by 0, Calculating a value of a multiplication value SDATA (SDATA = s_f * mxmin * std), and The condition (condition d) that the upper side count value mx4 should be smaller than the predetermined upper side count reference value mx2 and the lower side side count value mn4 should be smaller than the preset lower side number reference value mn2 (T_f) is satisfied when one of the two conditions (condition d and condition e) of the condition (condition e) satisfying the condition (condition e) is satisfied and the T calculation function 0, TDATA (TDATA = t_f * mxmin * std) obtained by multiplying the T calculation function (t_f) by the maximum minimum difference (mxmin) and the kurtosis (kurt) And an operation unit for determining an insulation state of the power device using the SDATA value and the TDATA value.