KR101789413B1 - Insulation status monitoring Apparatus of power equipments and method - Google Patents

Abstract

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.

Description

TECHNICAL FIELD [0001] The present invention relates to an apparatus for monitoring an insulation state of an electric power apparatus,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for monitoring the state of an electric power apparatus. More specifically, in order to monitor the insulation state of a power device including a power cable, a statistical value (standard deviation, kurtosis, maximum value, minimum value, etc.) of reading data of a signal detected through a sensor installed in the power device is calculated, The present invention relates to an apparatus for monitoring an insulation state of a power device and a method thereof for detecting an insulation state of the apparatus.

In recent years, with the rapid development of the industry, the possibility of various types of accidents that can occur in various facilities is continuously increasing due to the increase in the capacity of the electric power equipments. Therefore, there is an urgent need for a device for monitoring the deterioration state of electric power equipment in order to prevent accidents or improve reliability of operation of electric power facilities. In order to monitor the status of such power devices, sensors are installed in electric power devices. There are various types of sensors depending on the types of electric power devices and depending on the status monitoring signals to be detected. However, current CT Type sensor. An antenna sensor, an ultraviolet sensor, a thin film electrode sensor, an ultrasonic sensor, and a vibration sensor.

Since the signal detected through the sensor installed in the power device is insufficient and the noise signal is included in order to monitor the insulation state of the power device, the signal converted through the amplification and the filter is read many times to receive data (hereinafter, d1 data or d1 (n) data or d1 (n)). Generally, statistical values include a mean for displaying the value of the received data, a standard deviation for indicating the variance of the received data (referred to as std in the present invention), variance, skewness, kurtosis , The present invention uses a maximum value, a minimum value, and a difference between the maximum value and the minimum value (used in the present invention as maxmin).

In the patent No. 10-1299183 (filed on Aug. 16, 2013, entitled Power Quality Classification Method, Power Quality Monitoring Device and Power Quality Monitoring System Using Name Processing Method), average, variance, maximum value and minimum value , And the peak value, the effective value, and the average value of the received data in the registered patent 10-1070832 (registered on September 29, 2011, name " , The kurtosis, the degree of distortion, the standard deviation, and the like. In addition, the present invention is disclosed in Japanese Patent Application No. 10-1291595 filed on Jul. 25, This method uses statistical data on the standard deviation of the received data.

In order to explain the problem in using data obtained by statistically processing received data in this prior art, a comparison of statistical processing results using four kinds of received data is shown in Figs. 1, 2, 3, 4, and 5 Explain.

1 is a schematic block diagram of an embodiment of an insulation condition monitoring apparatus for a power device according to the related art and the present invention. 1, the insulation condition monitoring apparatus for a power device according to the present invention includes a detection sensor section 15 for detecting a signal related to an insulation state generated in a power device 10 to be measured, A filter amplification digital output unit 20 for extracting a signal of a predetermined frequency band from the signals of the insulation state detected by the signal detection unit 15 and amplifying the signal and outputting the amplified digital signal, A data input unit 120 having a function of inputting various data or various setting data through the arithmetic unit 200, and a storage unit 100 storing various data and flows, And a data display unit 110 for displaying various data.

FIG. 2 is a schematic flow chart of the insulation monitoring apparatus of the prior art and the present invention of FIG. 1, and FIG. 3 is a schematic block diagram of the insulation monitoring apparatus of FIG. (D1 DATA) stored in the storage unit 100 by reading the digital signal received data d1 (n) of the digital data signal d1 # 3 DATA is an example of data in which the waveform of about 4 times is repeated as shown in the graph, and #B DATA is an example of the data of the graph And #C DATA is an example of data in which data gradually increases from data # 1 to # 20 as shown in the graph, and #D DATA As shown in the graph, increases to the middle portion, Of the display data will for example, FIG. 5 displays various statistics been calculated by executing the flow chart of Figure 2 the data of Fig.

The conventional invention will be described in detail as follows.

As shown in Fig. 2, the conventional method of inspecting the electric apparatus for insulated states is a method of detecting the number of times of detection (in this example, 20 times, The method comprising the steps of: detecting a state of the power device in an insulation state by using a predetermined statistical value boundary, (S102) of extracting a signal of a predetermined frequency band from the signals detected by the detection sensor unit in the filter amplification digital output unit and amplifying and outputting the signal in a digital signal (S102) A step (S104) of storing n digital data to be outputted and received from the digital output unit; Calculating and storing statistical values (average value, standard deviation, maximum value, minimum value, difference between the maximum value and the minimum value, kurtosis, kurtosis) (S106), and various statistical values statistically processed And an insulation state determination step (S108) for comparing and judging boundary values of the statistical values.

As shown in FIGS. 3 and 4, the average value of the signal data detected in relation to the four kinds of insulation states as shown in FIG. 5 in which the various statistical values are calculated is in the range of 128.60 to 142.40 in #A to #D DATA And the standard deviation values are within the range of 6.98 to 6.99, and the standard deviation values are within the range of 6.98 to 6.99. Therefore, the standard deviation The difference in the type of the detected signal data can not be distinguished from each other, and one statistical value such as the maximum value, the minimum value, and the maximum value and the minimum value can not distinguish four data differences. If the value of skew and kurt is larger than #B DATA, it can be distinguished and it can be applied only to data of the same type as #B DATA. However, There was a difficulty in determining the characteristics of the type of rise and fall and the type of rise or fall of one data such as #B DATA.

Therefore, by detecting the signal data related to the insulation state of the electric power equipment, it is possible to determine whether there is a cycle characteristic of repeated rising and falling of the data, or whether the signal data has one-time rising or falling characteristics, There is a need for an invention that can accurately determine the insulation state of the power equipment.

SUMMARY OF THE INVENTION It is an object of the present invention to obviate the above problems of the prior art and to provide a method of monitoring an insulation state of a power device, The difference between the maximum value and the minimum value, and the like) of the difference between the maximum value and the minimum value of the signal data, It is possible to accurately determine the risk of the insulation state of the power device by calculating the determination and magnitude of whether the signal detected by the detection sensor has repetitive cyclic characteristics or one-time rise or fall characteristics using standard deviation values or kurtosis values And a method for monitoring the insulation state of an electric power device.

As a technical solution for achieving the object of the present invention, as a first aspect of the present invention, there is provided a power supply apparatus comprising: 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 (mn4) corresponding to the number of data equal to or smaller than mn3 = min + (mxmin * mn1 / 100) is calculated, and the lower-side number calculation value mn4 corresponding to the upper- (Xnr, xnr = mx4 / mn4, which is calculated as xnr = mx4 / mn4 in the embodiment of the present invention, but calculated as the value of xnr = mn4 / mx4) (Condition a) and the lower-side number calculation value mn4 that the upper-side-side number calculation value mx4 should be larger than the predetermined upper-side-number reference value mx2, (Condition b) and the upper sub-magnification calculation value (xnr) that are greater than the number reference value mn2 must be within the range of (1-xnrs) to (1 + xnrs) of the upper sub-magnification setting value (xnrs) (S_f) is replaced by 1 if all three conditions (condition a, condition b, and condition c) of the condition (condition c) are met. If one of the three conditions is not satisfied, the S calculation function (SDATA = s_f * mxmin * std) obtained by multiplying the S calculation function s_f by the value of the maximum minimum difference mxmin and the standard deviation std by substituting 0 with s (Condition d) in which the upper side number calculation value mx4 is smaller than a predetermined upper side number reference value mx2 and the lower side number calculation value mn4 are smaller than a predetermined lower side number reference value mn2 (Condition d, condition e), the T calculation function (t_f) is replaced by 1. If both of the two conditions are not satisfied, the T calculation function ( (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 electric power unit using the SDATA value of the power unit and the TDATA value.

According to a second aspect of the present invention, there is provided a power supply apparatus comprising: a detection sensor unit for detecting a signal related to an insulation state from an electric 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 (mn4) corresponding to the number of data equal to or smaller than mn3 = min + (mxmin * mn1 / 100) is calculated, and the lower-side number calculation value mn4 corresponding to the upper- (Xnr, xnr = mx4 / mn4, which is calculated as xnr = mx4 / mn4 in the embodiment of the present invention, but calculated as the value of xnr = mn4 / mx4) (Condition a) and the lower-side number calculation value mn4 that the upper-side-side number calculation value mx4 should be larger than the predetermined upper-side-number reference value mx2, (Condition b) and the upper sub-magnification calculation value (xnr) that are greater than the number reference value mn2 must be within the range of (1-xnrs) to (1 + xnrs) of the upper sub-magnification setting value (xnrs) (S_f) is replaced by 1 if all three conditions (condition a, condition b, and condition c) of the condition (condition c) are met. If one of the three conditions is not satisfied, the S calculation function (SDATA = s_f * mxmin * std) obtained by multiplying the S calculation function s_f by the value of the maximum minimum difference mxmin and the standard deviation std by substituting 0 with s And an arithmetic unit for determining the insulation state of the power equipment using the above SDATA value.

According to a third aspect of the present invention, there is also provided a power supply apparatus comprising: a detection sensor unit for detecting a signal related to an insulation state from an electric 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 and the lower side number calculation value mx4 is calculated The condition (condition d) that the lower number side reference value mx2 should be smaller than the upper side reference value mx2 and the condition that the lower side number calculation value mn4 should be smaller than the preset lower number reference value mn2 (T_f) is replaced with 1, and if both of the two conditions are not satisfied, the T calculation function (t_f) is replaced with 0, and the T calculation function (t_f) Calculating a value of TDATA (TDATA = t_f * mxmin * std) which is obtained by multiplying the maximum difference (mxmin) by a value of kurtosis (kurt) by the maximum minimum difference (mxmin) and the kurt value (kurt) and determining the insulation state of the power device using the TDATA value; The present invention relates to an apparatus for monitoring an insulation state of an electric power machine.

According to a fourth aspect of the present invention, there is provided a signal detection method comprising: a signal sensing step of sensing a signal related to an insulation state occurring in a measurement target power device in a detection sensor that detects a signal related to an insulation state of an electric power device; A filter amplification digital output step of extracting a signal of a predetermined frequency band from among the signals detected in the signal detection step and amplifying the signal, amplifying the amplified signal and outputting it as a digital value; A received data storing step of storing the received data d1 (n) by a set number (n) of digital values of the signal components output in the filter amplification digital output step; A maximum value max and a minimum value min with respect to the received data d1 (n) stored in the received data storing step and a maximum minimum difference (dd (n)) corresponding to the difference between the maximum value and the minimum value mxmin) and a kurtosis (kurt); (Mx1) value and a maximum value (max) calculated from the above-mentioned upper-side number% setting (mx1) value set in advance in the received data d1 An upper side number calculation step of calculating an upper side number calculation value mx4 corresponding to the number of data of the number reference value (mx3, mx3 = max- (mxmin * mx1 / 100)) or more; (Mn1) value and a minimum value (min) calculated in the lower-number-side number setting (mn1) set in advance in the received data d1 A lower side number calculation step of calculating a lower side number calculation value mn4 corresponding to a data number equal to or smaller than a reference value mn3, mn3 = min + (mxmin * mn1 / 100) (Xnr, xnr = mx4 / mn4, which is a ratio between the lower-order number calculation value mn4 and the lower-side number calculation value mn4, is calculated as xnr = mx4 / mn4 in the embodiment of the present invention, (Condition a) and the lower-side number calculation value mn4, in which the upper-side number calculation value mx4 is greater than a predetermined upper-side number reference value mx2, (Condition b) and the upper sub-magnification calculation value (xnr), which must be larger than the predetermined lower-number reference value mn2, (Condition a, condition b, and condition c) of the condition (condition c) that must be within the range of (1-xnrs) to (1 + xnrs) of the set upper sub-magnification setting value (xnrs) The calculation function s_f is replaced by 1 and the S calculation function s_f is replaced with 0 by substituting the S calculation function s_f with the maximum minimum difference m_min, An SDATA calculation step of calculating a value of SDATA (SDATA = s_f * mxmin * std) multiplied by the value of the deviation std, Of the two conditions (condition d and condition e), that is, the condition (condition d) and the condition that the lower-side number calculation value mn4 should be smaller than the predetermined lower-number reference value mn2 The t-arithmetic function t_f is replaced with 1, and if the two conditions are not all satisfied, the T-arithmetic function t_f is replaced with 0, A TDATA calculation step of calculating a value of TDATA (TDATA = t_f * mxmin * std) which is obtained by multiplying the value of the difference (mxmin) by the value of kurtosis (kurt); The SDATA value calculated in the SDATA calculation step is compared with the preset SDATA boundary value Ss or the TDATA value calculated in the TDATA calculation step is compared with the preset TDATA boundary value Ts alone or in combination And an insulation state determining step of determining an insulation state of the power device based on the detected state of the power device.

According to a fifth aspect of the present invention, there is provided a method of controlling a power device, comprising: detecting a signal related to an insulation state of a power device; A filter amplification digital output step of extracting a signal of a predetermined frequency band from among the signals detected in the signal detection step and amplifying the signal, amplifying the amplified signal and outputting it as a digital value; A received data storing step of storing the received data d1 (n) by a set number (n) of digital values of the signal components output in the filter amplification digital output step; A maximum value max and a minimum value min with respect to the received data d1 (n) stored in the received data storing step and a maximum minimum difference (dd (n)) corresponding to the difference between the maximum value and the minimum value mxmin) and a kurtosis (kurt); (Mx1) value and a maximum value (max) calculated from the above-mentioned upper-side number% setting (mx1) value set in advance in the received data d1 An upper side number calculation step of calculating an upper side number calculation value mx4 corresponding to the number of data of the number reference value (mx3, mx3 = max- (mxmin * mx1 / 100)) or more; (Mn1) value and a minimum value (min) calculated in the lower-number-side number setting (mn1) set in advance in the received data d1 A lower side number calculation step of calculating a lower side number calculation value mn4 corresponding to a data number equal to or smaller than a reference value mn3, mn3 = min + (mxmin * mn1 / 100) (Xnr, xnr = mx4 / mn4, which is a ratio between the lower-order number calculation value mn4 and the lower-side number calculation value mn4, is calculated as xnr = mx4 / mn4 in the embodiment of the present invention, (Condition a) and the lower-side number calculation value mn4, in which the upper-side number calculation value mx4 is greater than a predetermined upper-side number reference value mx2, (Condition b) and the upper sub-magnification calculation value (xnr), which must be larger than the predetermined lower-number reference value mn2, (Condition a, condition b, and condition c) of the condition (condition c) that must be within the range of (1-xnrs) to (1 + xnrs) of the set upper sub-magnification setting value (xnrs) The calculation function s_f is replaced by 1 and the S calculation function s_f is replaced with 0 by substituting the S calculation function s_f with the maximum minimum difference m_min, A SDATA calculation step of calculating a value of SDATA (SDATA = s_f * mxmin * std) multiplied by the value of the deviation std, an SDATA calculation step of calculating an SDATA value calculated in the SDATA calculation step, And an insulation state determining step of determining an insulation state of the electric power device by comparing the detected state of the power device with the insulation state of the power device.

According to a sixth aspect of the present invention, there is provided a method of controlling a power device, comprising: detecting a signal related to an insulation state of a power device under measurement in a detection sensor for detecting a signal related to an insulation state of the power device; A filter amplification digital output step of extracting a signal of a predetermined frequency band from among the signals detected in the signal detection step and amplifying the signal, amplifying the amplified signal and outputting it as a digital value; A received data storing step of storing the received data d1 (n) by a set number (n) of digital values of the signal components output in the filter amplification digital output step; A maximum value max and a minimum value min with respect to the received data d1 (n) stored in the received data storing step and a maximum minimum difference (dd (n)) corresponding to the difference between the maximum value and the minimum value mxmin) and a kurtosis (kurt); (Mx1) value and a maximum value (max) calculated from the above-mentioned upper-side number% setting (mx1) value set in advance in the received data d1 An upper side number calculation step of calculating an upper side number calculation value mx4 corresponding to the number of data of the number reference value (mx3, mx3 = max- (mxmin * mx1 / 100)) or more; (Mn1) value and a minimum value (min) calculated in the lower-number-side number setting (mn1) set in advance in the received data d1 A lower side number calculation step of calculating a lower side number calculation value mn4 corresponding to a data number equal to or smaller than a reference value mn3, mn3 = min + (mxmin * mn1 / 100) (Condition d) that the lower-side number reference value mn2 should be smaller than the preset upper-side reference value mx2 and the condition (condition e) that the lower-side number calculation value mn4 should be smaller than the predetermined lower- If one of the conditions (condition d and condition e) is satisfied, the T calculation function t_f is replaced by 1. If all of the two conditions are not satisfied, the T calculation function t_f is replaced with 0, The value of TDATA (TDATA = t_f * mxmin * std), which is obtained by multiplying the function t_f by the value of the maximum minimum difference (mxmin) and the kurtosis (kurt) And an insulation state determination step of determining an insulation state of the power device by comparing the TDATA value calculated in the TDATA calculation step with a preset TDATA boundary value Ts, .

According to the present invention, in monitoring the insulation state of the electric power equipment, one statistical value (e.g., standard deviation, average value, maximum value, minimum value, The difference between the maximum value and the minimum value) can not accurately determine the insulated state by comparing and multiplying the number of upper data beyond the set value or the lower data number below the set value with the statistic value, The risk of the insulated state of the power device can be accurately determined by using the value obtained by comparing or multiplying the power device.

1 is a schematic block diagram of an embodiment of an insulation condition monitoring apparatus for a power device according to the related art and the present invention.
2 is a flow chart for explaining a conventional method of monitoring an insulation state of an electric power device.
FIG. 3 shows four kinds of received data d1 (n) that are detected, filtered and amplified by the detection sensor unit and output as digital values and received by the operation unit.
Fig. 4 is a graph showing the four kinds of received data d1 (n) of Fig.
FIG. 5 shows statistical values calculated and stored in a conventional manner for the four types of received data d1 (n) in FIG.
6 is a schematic configuration diagram of an embodiment of a calculating unit which is a main part of the insulation condition monitoring apparatus of the electric power equipment of the present invention.
7 is a flowchart for explaining a first embodiment of an insulation state monitoring apparatus and method for monitoring electric power equipment according to the present invention.
FIG. 8 shows an example of the calculation result of the statistical value calculated by executing the flowchart of the first embodiment of the present invention and the result of the execution of the received data of FIG.
FIG. 9 is a flowchart for explaining a first embodiment of an insulation state determination flow in an insulation state monitoring apparatus and method for an electric power apparatus according to the present invention.
10 is a flowchart for explaining a second embodiment of an insulation condition monitoring apparatus and monitoring method of an electric power apparatus according to the present invention.
FIG. 11 shows an example of the calculation result of the statistical value calculated by executing the flowchart of the second embodiment of the present invention and the result of the execution of the received data of FIG.
12 is a flowchart for explaining a second embodiment of the insulation state determination flow in the insulation state monitoring apparatus and monitoring method of the electric power apparatus of the present invention.
13 is a flowchart for explaining a third embodiment of the insulation state monitoring apparatus and monitoring method of the electric power apparatus of the present invention.
FIG. 14 shows an example of the calculation result of the statistical value calculated by executing the flowchart of the third embodiment of the present invention and the result of the execution of the received data of FIG.
15 is a flowchart for explaining a third embodiment of the insulation state determination flow in the insulation state monitoring method of the electric power apparatus according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the structure of the invention of an embodiment of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a schematic block diagram of an embodiment of an insulation condition monitoring apparatus for a power device according to the present invention, and FIG. 6 is a schematic diagram for explaining an embodiment of a calculation section which is a main part of the insulation condition monitoring apparatus for a power device according to the present invention. FIG. It is to be understood that the terminology used herein is for the purpose of describing the present invention only and is not used to limit the scope of the present invention as defined in the claims or the claims, It may be omitted. In describing the embodiments of the present invention, overlapping description may be omitted in the configurations described in the above-mentioned prior art or similar configurations of the embodiments of the present invention.

As shown in FIGS. 1 and 6, the insulation condition monitoring apparatus for a power device of the present invention includes a detection sensor unit 15 for detecting a signal related to an insulation condition in a power device 10 to be measured; A filter amplification digital output unit 20 for extracting, amplifying and outputting a signal of a predetermined frequency band among the signals detected by the detection sensor unit 15 as a digital value; (N1) data or d1 (n) data or d1 data or d1 data) received from the filter amplification digital output unit 20 A storage unit (100) for storing setting data; The minimum value (mxmin), kurtosis (kurt)) of the statistical values (standard deviation (std), maximum value (max), minimum value (min) A statistical value calculation unit 40 for calculating a statistical value;

(Mx3, mx3) using the preset upper-side number% setting (mx1) value and the maximum minus difference (mxmin) value and the maximum value (max) calculated in the reception data d1 (mx4) corresponding to the number of data equal to or greater than a predetermined number (mxmin * mx1 / 100) of the received data dx (Mn3, mn3 = min + (mxmin * mn1 / 100)) using the mn1 value setting value (mn1) and the maximum minimum difference (mxmin) value and the minimum value An upper-lower-side number calculation unit 50 for calculating and calculating a lower-side number calculation value mn4;

(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, A multiplication value SDATA (SDATA = s_f mxmin * * std) SDATA calculation unit 60 for calculating the value of a; And an insulation state judging unit 80 for judging the insulation state of the power equipment by comparing the SDATA value calculated by the DATA calculation unit 60 with the set SDATA boundary value Ss.

Further, the apparatus for monitoring the insulation state of the power device of the present invention

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 if one of the two conditions (condition d and condition e) of the condition (condition e) is satisfied and if both conditions are not satisfied, the T calculation function (t_f) (TDATA = t_f * mxmin * std) obtained by multiplying the above-described T calculation function (t_f) by the maximum minimum difference (mxmin) and the value of kurtosis (kurt) 70 can be further configured.

The apparatus for monitoring an insulation state of a power device according to the present invention may include an arithmetic unit 200 including the above-described statistical value calculator 40 or the above-described insulation state determiner.

In addition, the apparatus for monitoring the insulation state of the power device of the present invention can visually display the calculated values calculated by the statistic value calculation unit 40, visually display the result of the upper-lower-side number calculation unit 50 , The calculation value calculated by the SDATA calculation unit 60 is visually displayed or the calculation value calculated by the TDATAr calculation unit 70 is visually displayed or the determination result of the insulation state determination unit 80 The alarm output unit 130 for outputting an alarm visually or audibly according to the determination result of the insulation state determination unit 80 may be further provided . The apparatus may further include a remote communication means for communicating with a manager computer that can be remotely checked or controlled by using the insulated state monitoring device of the power device and the wired / wireless communication means.

The detection sensor unit 15 may include a configuration including a coupling capacitor, a CT type sensor, a current sensor, or a Shunt type sensor. The detection sensor unit 15 may also be installed on the ground line of the power device to detect a signal related to the insulation state.

FIG. 7 is a flowchart for explaining an embodiment of an insulation state monitoring apparatus and method for monitoring electric power equipment according to the present invention. As shown in FIG. 7, the apparatus for monitoring and monitoring the insulation state of a power device according to the present invention detects a signal related to an insulation state generated in a measurement target power device in a detection sensor for detecting a signal related to an insulation state of the power device (S200);

A filter amplification digital output step S202 for extracting a signal of a predetermined frequency band from among the signals detected in the signal detection step S200 and amplifying the signal and outputting the amplified signal as a digital value;

A received data storage step (S206) of storing the received data d1 (n) by the set number (n) of the digital values of the signal components output in the filter amplification digital output step S202;

A maximum value max, a minimum value min, and a maximum value corresponding to the difference between the maximum value and the minimum value with respect to the received data d1 (n) stored in the received data storing step S206 A statistical value calculation step S208 for calculating a minimum difference mxmin and a kurtosis kurt;

(Mx1) value and a maximum value (max) calculated using the above-described upper-side number% setting (mx1) value in the received data dl (n) stored in the reception data storing step S208 Calculating an upper side number calculation value (mx4) corresponding to the number of data equal to or larger than the upper side number reference value (mx3, mx3 = max- (mxmin * mx1 / 100));

(Mn1) value and a minimum value (min) calculated in the above-described step of storing the received data dl (n) stored in the received data storing step S206 A lower side number calculation step (S212) of calculating a lower side number calculation value (mn4) corresponding to the number of data of the lower side number reference value (mn3, mn3 = min + (mxmin * mn1 / 100) or less;

(Xnr, xnr = mx4 / mn4, which is a ratio of the upper side number calculation value mx4 and the lower side number calculation value mn4, which is a ratio between the upper side number calculation value mx4 and the lower side number calculation value mn4, calculated as xnr = mx4 / mn4 in the embodiment of the present invention (Condition a) that the upper side count value mx4 should be larger than the predetermined upper side count reference value mx2 by calculating xnr = mn4 / mx4, (Condition b) in which the lower-side number calculation value mn4 and the lower-side number calculation value mn4 are greater than a predetermined lower-number reference value mn2, (Condition a, condition b, and condition c) of the condition (condition c) that must be within the range (1-xnrs) to (1 + xnrs) , The S calculation function s_f, the maximum minimum difference mxmin, and the standard deviation std (sd) are substituted by 0 if the S calculation function s_f is not satisfied, (SDATA = s_f * mxmin * std) obtained by multiplying the value of the SDATA (SDATA = s_f * mxmin * std)

(Condition d) in which the upper side number calculation value mx4 is smaller than a predetermined upper side number reference value mx2 and the lower side number calculation value mn4 are smaller than a predetermined lower side number reference value mn2 If one of the two conditions (condition d and condition e) of the condition to be small (condition e) is satisfied, the T calculation function t_f is replaced by 1. If all of the two conditions are not satisfied, Calculating a value of TDATA (TDATA = t_f * mxmin * std) obtained by multiplying the above-described T calculation function (t_f) by the maximum minimum difference (mxmin) and the value of kurtosis (kurt) (S216);

The SDATA value calculated in the SDATA calculation step is compared with the preset SDATA boundary value Ss or the TDATA value calculated in the TDATA calculation step is compared with the preset TDATA boundary value Ts alone or in combination And an insulation state determination step (S218) for determining an insulation state of the power device.

FIG. 8 shows the results of executing the four kinds of received data d1 (n) data of FIG. 3 by the flow of the first embodiment of FIG. 7, Table.

The first embodiment of the present invention will be described in detail with reference to Figs. 7 and 8 which are the first embodiment of the present invention. Fig.

In the reception data storing step (S206), digital values outputted in the filter amplification digital output step (S202) are outputted 20 times (20 times in the embodiment of the present invention, but 20 times (N) data or d1 (n) data or d1 (n) data in the present invention in the present invention. do. 8, d1 (1) = 135, d1 (2) = 130 to d (19) = 130 and d1 (20) = 129 in the case of #A data. , #B data, #C data, and #D data are received and stored, respectively.

In the statistical value calculation step S208, the standard deviation std, the maximum value max, the minimum value min, and the maximum value of the received data d1 (n) data received and stored in the received data storage step S206 (Mxmin, mxmin = max-min) and kurtosis (kurt) corresponding to the difference between the minimum value and the minimum value, respectively. Since the terms of the statistical values are generally used in statistics, the description of the terms is omitted. (Std) = 6.98, maximum value (max) = 148, minimum value (min) = 129, maximum value and minimum value The difference (mxmin) = 148-129 = 19 and kurt = -1.22. As described in the related art, the statistical values of # A to # D data are compared. # A to # D data The standard deviation (std) calculated from the four types of data is 6.98 to 6.99, std) can not distinguish four kinds of data types, and the maximum value (max) statistic value is the largest value of #B data, and it is not possible to distinguish four different kinds of data types , And the minimum value (min) is the minimum value of #C data and the #B data and #D data are almost the same values. The statistic value of minimum value (min) , And the statistical values of the maximum minimum difference (mxmin) are almost equal to those of #C data and #D data. The statistical values of the maximum minimum difference (mxmin) It is impossible to distinguish. However, in the case of #B data, the values of kurtosis and distortion are much higher than those of the other three kinds of data, but 19 of the 20 received data have the same value, and even if only one data is slightly changed, Can be a large value, and even if a small noise signal is input, the values of the kurtosis and distortion can be large.

In the upper side number calculation step S210, the upper side number% setting (mx1, 30% in the embodiment of the present invention) set in advance in the received data d1 (n) data stored in the reception data storing step (S206) But the present invention is not limited to these values, which can constitute 30% or less or 30% or more of the embodiments), the maximum value max and the maximum minimum difference mxmin, (Mx4) corresponding to the number of received data d1 (n) data equal to or larger than the upper-side number reference value (mx3) is calculated as the reference value (mx3, mx3 = max- . In the example of #A data in FIG. 8, mx3 = 148- (19 * 30/100) = 142.3 is calculated using statistic values of max = 148 and mxmin = When the number of data in the range of max (142.3 ~ 148) is calculated, the value of the upper side count value (mx4) is 8.

In the lower number calculation step S212, the lower number% setting (mn1, 30% in the embodiment of the present invention) preset in the received data d1 (n) data stored in the reception data storing step (S206) But it is not limited to 30% or 30% or more than 30%, and the value is not limited), the lower limit value min and the lower limit value mxmin, (mn3, mn3 = min + (mxmin * mn1 / 100)) and calculates a lower-side number calculation value mn4 corresponding to the number of received data d1 (n) data equal to or smaller than the lower- . In the example of #A data in FIG. 8, mn3 = 129 + (19 * 30/100) = 134.7 is calculated using statistical values of min = 129 and mxmin = When the number of data in the range of mn3 (129 to 134.7) is calculated, the value of the lower side count value (mn4) is 9.

In the SDATA calculation step S214, the upper side number calculation value mx4 calculated in the upper side number calculation step s210 and the lower side number calculation value mn4 calculated in the lower side number calculation step S212 (Xnr, xnr = mx4 / mn4, which is calculated as xnr = mx4 / mn4 in the embodiment of the present invention, but may be calculated as the value of xnr = mn4 / mx4). (Mx2), which is greater than a predetermined upper-rank reference value (mx2, although the value of 3 is used in the embodiment of the present invention, but this value is not limited), by calculating the upper-side count value mx4 Condition (a) and the lower-side number calculation value (mn4) must be larger than a preset lower-side number reference value (mn2, although the value of 3 is used in the embodiment of the present invention, but this value is not limited) b) and the upper sub-magnification calculation value (xnr) are set to a preset upper sub-magnification setting (condition c), which must be within the range of (1-xnrs) to (1 + xnrs) of (xnrs, the embodiment of the invention uses a value of 0.3 but does not limit this value) (S_f) is replaced by 1 if all of the conditions (condition a, condition b, and condition c) are satisfied, and if the value of one of the three conditions is not satisfied, the value of the S calculation function And calculates the value of SDATA (SDATA = s_f * mxmin * std) obtained by multiplying the S calculation function s_f by the value of the maximum minimum difference mxmin and the standard deviation std. In the example of #A data in FIG. 8, xnr = mx4 / mn4 = 8/9 = 0.89 at mx4 = 8 and mn4 = 9. The value 8 of the upper side count value mx4 satisfies the condition (condition a) that mx2 = 3 should be satisfied and the value 9 of the lower side count value mn4 should be larger than mn2 = 3 (1-xnrs) to (1 + xnrs) = (1-0.3) to (1 + 0.3) = 0.73 to 0.75, which is the upper subrange value, (S) satisfies all three conditions (condition a, condition b, and condition c) satisfying the condition (condition c) in which std = 6.98 and mxmin = 19 Using the data, the value of SDATA is calculated as SDATA = s_f * mxmin * std = 1 * 19 * 6.98 = 132.62.

In the TDATA calculation step S216, the condition (condition d) that the upper side number calculation value mx4 calculated in the upper side number calculation step s210 should be smaller than the predetermined upper side number reference value mx2 and the condition Of the two conditions (condition d and condition e) of the condition (e) in which the lower-side number calculation value mn4 calculated in the lower-side number calculation step S212 must be smaller than the predetermined lower-number reference value mn2 The t-arithmetic function t_f is replaced by 1 and the T-arithmetic function t_f is replaced with 0 if both conditions are not satisfied, and the T-arithmetic function t_f and the maximal minimum difference m_min (TDATA = t_f * mxmin * std) which is obtained by multiplying the value of the kurtosis (kurt) by the value of the kurtosis (kurt). 8, the value of mx4 = 2 at the value of mx4 = 2 and mn4 = 18 satisfies the condition (condition d) that must be smaller than mx2 = 3 and the value of mn4 = 18 must be smaller than mn2 = 3 (Condition e) is satisfied but the condition d is satisfied, the T calculation function t_f = 1 and the value of TDATA is TDATA = t_f * mxmin * kurt = 1 using data of kurt = 7.23 and mxmin = 26 * 26 * 7.23 = 187.98 The value is calculated.

FIG. 9 is a flowchart for explaining a first embodiment of the insulation state determination flow in the insulation state monitoring apparatus and monitoring method for electric power equipment according to the present invention.

FIG. 9 is a flowchart illustrating a method of determining an insulation state according to the first embodiment of the present invention. In the first embodiment of the present invention, when the calculated value of SDATA calculated above is a predetermined SDATA boundary value Ss (50.00 in the embodiment of the present invention, SDATA value comparing step S222 for comparing whether the value is larger than the predetermined value or not; A TDATA value comparison step in which the computed value of the TDATA calculated above is greater than a preset TDATA boundary value (Ts, although the value of 50.00 is used in the embodiment of the present invention, but is not limited thereto) (S224); If the calculated value of SDATA is greater than the SDATA threshold value Ss in the SDATA value comparison step S222 or the calculated value of TDATA is greater than the TDATA threshold value Ts in the TDATA value comparison step S224, An insulation state failure judgment step (S226) of judging that the state is defective; If the calculated value of SDATA is smaller than the SDATA threshold value Ss in the SDATA value comparison step S222 and the calculated value of TDATA in the TADATA value comparison step S224 is smaller than the TDATA threshold value Ts, And an insulation state goodness determining step (S228) in which the insulation state is determined to be good.

8, it is determined that the insulation state of the power device is determined to be defective because SDATA = 132.62, TDATA = 0.00 and SDATA value (132.62) is greater than Ss = 50.00 in #A data. And the SDATA value (0.00) is smaller than Ss = 50.00 and the TDATA value (187.98) is larger than Ts = 50.00 in the case of #B data, so that the insulation state of the power equipment is judged as defective And the TDATA value (0.00) is smaller than Ts = 50.00 in the #C data, the SDATA value (0.00) is smaller than Ss = 50.00 and the TDATA value (0.00) (S228) of judging that the insulation state of the semiconductor device is good.

10 is a flowchart for explaining a second embodiment of an insulation condition monitoring apparatus and monitoring method of an electric power apparatus according to the present invention. As shown in FIG. 10, the apparatus for monitoring and monitoring the insulation state of a power device according to the present invention detects a signal related to an insulation state generated in a target power device in a detection sensor that detects a signal related to an insulation state of the power device (S200);

A filter amplification digital output step S202 for extracting a signal of a predetermined frequency band from among the signals detected in the signal detection step S200 and amplifying the signal and outputting the amplified signal as a digital value;

A received data storage step (S206) of storing the received data d1 (n) by the set number (n) of the digital values of the signal components output in the filter amplification digital output step S202;

A maximum value max, a minimum value min, and a maximum value corresponding to the difference between the maximum value and the minimum value with respect to the received data d1 (n) stored in the received data storing step S206 A statistical value calculation step S208 for calculating a minimum difference mxmin and a kurtosis kurt;

(Mx1) value and a maximum value (max) calculated using the above-described upper-side number% setting (mx1) value in the received data dl (n) stored in the reception data storing step S208 Calculating an upper side number calculation value (mx4) corresponding to the number of data equal to or larger than the upper side number reference value (mx3, mx3 = max- (mxmin * mx1 / 100));

(Mn1) value and a minimum value (min) calculated in the above-described step of storing the received data dl (n) stored in the received data storing step S206 A lower side number calculation step (S212) of calculating a lower side number calculation value (mn4) corresponding to the number of data of the lower side number reference value (mn3, mn3 = min + (mxmin * mn1 / 100) or less;

(Xnr, xnr = mx4 / mn4, which is a ratio of the upper side number calculation value mx4 and the lower side number calculation value mn4, which is a ratio between the upper side number calculation value mx4 and the lower side number calculation value mn4, calculated as xnr = mx4 / mn4 in the embodiment of the present invention (Condition a) that the upper side count value mx4 should be larger than the predetermined upper side count reference value mx2 by calculating xnr = mn4 / mx4, (Condition b) in which the lower-side number calculation value mn4 and the lower-side number calculation value mn4 are greater than a predetermined lower-number reference value mn2, (Condition a, condition b, and condition c) of the condition (condition c) that must be within the range (1-xnrs) to (1 + xnrs) , The S calculation function s_f, the maximum minimum difference mxmin, and the standard deviation std (sd) are substituted by 0 if the S calculation function s_f is not satisfied, (SDATA = s_f * mxmin * std) obtained by multiplying the value of the SDATA (SDATA = s_f * mxmin * std)

And an insulation state determination step (S218) of comparing the SDATA value calculated in the SDATA calculation step with the preset SDATA boundary value (Ss) to determine the insulation state of the power device.

11 is a result of executing the four kinds of received data d1 (n) data of Fig. 3 in the flow of the second embodiment of Fig. 10, and shows a second embodiment of the insulation state monitoring apparatus and the monitoring method of the present invention 12 is a flowchart for explaining a second embodiment of the insulation state determination flow in the insulation state monitoring apparatus and monitoring method of the electric power apparatus of the present invention.

12, which is the second embodiment of the insulation state determination flow of the insulation state monitoring apparatus and monitoring method of the present invention, except for the TDATA calculation step S216 and the TDATA value comparison step S224 in the first embodiment described above , So a detailed explanation will be omitted.

13 is a flowchart for explaining a third embodiment of the insulation state monitoring apparatus and monitoring method of the electric power apparatus of the present invention. As shown in FIG. 13, the apparatus for monitoring and monitoring the insulation state of a power device of the present invention detects a signal related to an insulation state generated in a target power device in a detection sensor that detects a signal related to the insulation state of the power device (S200);

A filter amplification digital output step S202 for extracting a signal of a predetermined frequency band from among the signals detected in the signal detection step S200 and amplifying the signal and outputting the amplified signal as a digital value;

A received data storage step (S206) of storing the received data d1 (n) by the set number (n) of the digital values of the signal components output in the filter amplification digital output step S202;

A maximum value max, a minimum value min, and a maximum value corresponding to the difference between the maximum value and the minimum value with respect to the received data d1 (n) stored in the received data storing step S206 A statistical value calculation step S208 for calculating a minimum difference mxmin and a kurtosis kurt;

(Mx1) value and a maximum value (max) calculated using the above-described upper-side number% setting (mx1) value in the received data dl (n) stored in the reception data storing step S208 Calculating an upper side number calculation value (mx4) corresponding to the number of data equal to or larger than the upper side number reference value (mx3, mx3 = max- (mxmin * mx1 / 100));

(Mn1) value and a minimum value (min) calculated in the above-described step of storing the received data dl (n) stored in the received data storing step S206 A lower side number calculation step (S212) of calculating a lower side number calculation value (mn4) corresponding to the number of data of the lower side number reference value (mn3, mn3 = min + (mxmin * mn1 / 100) or less;

(Condition d) in which the upper side number calculation value mx4 is smaller than a predetermined upper side number reference value mx2 and the lower side number calculation value mn4 are smaller than a predetermined lower side number reference value mn2 If one of the two conditions (condition d and condition e) of the condition to be small (condition e) is satisfied, the T calculation function t_f is replaced by 1. If all of the two conditions are not satisfied, Calculating a value of TDATA (TDATA = t_f * mxmin * std) obtained by multiplying the above-described T calculation function (t_f) by the maximum minimum difference (mxmin) and the value of kurtosis (kurt) (S216);

And an insulation state determination step (S218) of comparing the TDATA value calculated in the TDATA calculation step with the preset TDATA boundary value Ts to determine the insulation state of the power device.

14 is a result of executing the four kinds of received data d1 (n) data of Fig. 3 by the flow of the third embodiment of Fig. 13, and shows a third embodiment of the insulation state monitoring apparatus and monitoring method of the present invention 14 is a flowchart for explaining the third embodiment of the insulation state determination flow in the insulation state monitoring apparatus and monitoring method of the electric power apparatus of the present invention.

FIG. 15, which is a third embodiment of the insulation state determination flow of the insulation state monitoring apparatus and monitoring method of the present invention, includes the steps of calculating the SDATA (S214) and comparing the SDATA value (S222) in the first embodiment , So a detailed explanation will be omitted.

The embodiments of the apparatus and method for monitoring the insulation state of a power device of the present invention described above are only a few of the various embodiments of the present invention. The signal relating to the insulation state of the power device of the present invention is measured and the statistical value (standard deviation, maximum minimum difference, and kurtosis) of the extracted data extracted from the digital data relating to the signal component of the set frequency band is It is obvious that the embodiments other than the above-mentioned embodiments are also covered by the protection scope of the present invention as long as they are included in the technical idea of comparing the number of data or the number of data below the set value.

10: Power equipment
15:
20: Filter, amplification and digital output section
40: statistical value calculation unit
50: upper-lower-side number calculation unit
60: SDATA calculation unit
70: TDATA calculation section
80:
200:

Claims (6)

A detection sensor unit for detecting a signal related to the insulation state from the 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 number calculation value mx4 should be smaller than the predetermined upper side number reference value mx2 and the lower side number calculation value mn4 should be smaller than the preset lower side number reference value mn2 If one of the two conditions (condition d and condition e) of the condition (condition e) is satisfied, the T calculation function t_f is replaced by 1. If all of the two conditions are not satisfied, the T calculation function t_f is set to 0 And calculates the value of TDATA (TDATA = t_f * mxmin * std) obtained by multiplying the T calculation function (t_f) by the value of the maximum minimum difference (mxmin) and the kurtosis (kurt)
And an operation unit for determining an insulation state of the electric power unit using the SDATA value and the TDATA value. A detection sensor unit for detecting a signal related to the insulation state from the 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
And an operation unit for determining an insulation state of the power device using the SDATA value. A detection sensor unit for detecting a signal related to the insulation state from the 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,
The condition (condition d) that the upper side number calculation value mx4 should be smaller than the predetermined upper side number reference value mx2 and the lower side number calculation value mn4 should be smaller than the preset lower side number reference value mn2 If one of the two conditions (condition d and condition e) of the condition (condition e) is satisfied, the T calculation function t_f is replaced by 1. If all of the two conditions are not satisfied, the T calculation function t_f is set to 0 And calculates the value of TDATA (TDATA = t_f * mxmin * std) obtained by multiplying the T calculation function (t_f) by the value of the maximum minimum difference (mxmin) and the kurtosis (kurt)
And an operation unit for determining an insulation state of the power device using the TDATA value. A signal sensing step of sensing a signal related to an insulation state occurring in a power device under measurement at a detection sensor for detecting a signal related to an insulation state of the power device;
A filter amplification digital output step of extracting a signal of a predetermined frequency band from among the signals detected in the signal detection step and amplifying the signal, amplifying the amplified signal and outputting it as a digital value;
A received data storing step of storing the received data d1 (n) by the set number (n) of digital values of the signal components output in the filter amplification digital output step;
A maximum value max and a minimum value min with respect to the received data d1 (n) stored in the received data storing step and a maximum minimum difference (dd (n)) corresponding to the difference between the maximum value and the minimum value mxmin) and a kurtosis (kurt);
(Mx1) value and a maximum value (max) calculated from the above-mentioned upper-side number% setting (mx1) value set in advance in the received data d1 Calculating an upper side number calculation value mx4 corresponding to the number of data equal to or larger than the reference number mx3, mx3 = max- (mxmin * mx1 / 100);
(Mn1) value and a minimum value (min) calculated in the lower-number-side number setting (mn1) set in advance in the received data d1 A lower number calculation value calculation step of calculating a lower number number calculation value mn4 corresponding to the number of data of the reference value mn3, mn3 = min + (mxmin * mn1 / 100) or less;
(Xnr, xnr = mx4 / mn4, which is a ratio of the upper side number calculation value mx4 and the lower side number calculation value mn4, which is a ratio between the upper side number calculation value mx4 and the lower side number calculation value mn4, calculated as xnr = mx4 / mn4 in the embodiment of the present invention (Condition a) that the upper side count value mx4 should be larger than the predetermined upper side count reference value mx2 by calculating xnr = mn4 / mx4, (Condition b) in which the lower-side number calculation value mn4 and the lower-side number calculation value mn4 are greater than a predetermined lower-number reference value mn2, (Condition a, condition b, and condition c) of the condition (condition c) that must be within the range (1-xnrs) to (1 + xnrs) , The S calculation function s_f, the maximum minimum difference mxmin, and the standard deviation std (sd) are substituted by 0 if the S calculation function s_f is not satisfied, (SDATA = s_f * mxmin * std) obtained by multiplying the value of the SDATA (SDATA = s_f * mxmin * std)
(Condition d) and the lower-side number calculation value mn4 should be smaller than the predetermined lower-side number reference value mn2 (i.e., the lower-side-side number calculation value mn2 must be smaller than the upper-side-side number reference value mx2) (T_f) is satisfied if one of the two conditions (condition d and condition e) of the condition (condition e) is satisfied and if both conditions are not satisfied, the T calculation function (t_f) 0, TDATA (TDATA = t_f * mxmin * std) which is obtained by multiplying the T calculation function (t_f) by the maximum minimum difference (mxmin) and the kurtosis (kurt) ;
The SDATA value calculated in the SDATA calculation step is compared with the preset SDATA boundary value Ss or the TDATA value calculated in the TDATA calculation step is compared with the preset TDATA boundary value Ts alone or in combination And determining an insulation state of the power device based on the detected state of the power device. A signal sensing step of sensing a signal related to an insulation state occurring in a power device under measurement at a detection sensor for detecting a signal related to an insulation state of the power device;
A filter amplification digital output step of extracting a signal of a predetermined frequency band from among the signals detected in the signal detection step and amplifying the signal, amplifying the amplified signal and outputting it as a digital value;
A received data storing step of storing the received data d1 (n) by the set number (n) of digital values of the signal components output in the filter amplification digital output step;
A maximum value max and a minimum value min with respect to the received data d1 (n) stored in the received data storing step and a maximum minimum difference (dd (n)) corresponding to the difference between the maximum value and the minimum value mxmin) and a kurtosis (kurt);
(Mx1) value and a maximum value (max) calculated from the above-mentioned upper-side number% setting (mx1) value set in advance in the received data d1 Calculating an upper side number calculation value mx4 corresponding to the number of data equal to or larger than the reference number mx3, mx3 = max- (mxmin * mx1 / 100);
(Mn1) value and a minimum value (min) calculated in the lower-number-side number setting (mn1) set in advance in the received data d1 A lower number calculation value calculation step of calculating a lower number number calculation value mn4 corresponding to the number of data of the reference value mn3, mn3 = min + (mxmin * mn1 / 100) or less;
(Xnr, xnr = mx4 / mn4, which is a ratio of the upper side number calculation value mx4 and the lower side number calculation value mn4, which is a ratio between the upper side number calculation value mx4 and the lower side number calculation value mn4, calculated as xnr = mx4 / mn4 in the embodiment of the present invention (Condition a) that the upper side count value mx4 should be larger than the predetermined upper side count reference value mx2 by calculating xnr = mn4 / mx4, (Condition b) in which the lower-side number calculation value mn4 and the lower-side number calculation value mn4 are greater than a predetermined lower-number reference value mn2, (Condition a, condition b, and condition c) of the condition (condition c) that must be within the range (1-xnrs) to (1 + xnrs) , The S calculation function s_f, the maximum minimum difference mxmin, and the standard deviation std (sd) are substituted by 0 if the S calculation function s_f is not satisfied, (SDATA = s_f * mxmin * std) obtained by multiplying the value of the SDATA (SDATA = s_f * mxmin * std)
And an insulation state determination step of comparing the SDATA value calculated in the SDATA calculation step with the preset SDATA boundary value Ss to determine the insulation state of the power device. A signal sensing step of sensing a signal related to an insulation state occurring in a power device under measurement at a detection sensor for detecting a signal related to an insulation state of the power device;
A filter amplification digital output step of extracting a signal of a predetermined frequency band from among the signals detected in the signal detection step and amplifying the signal, amplifying the amplified signal and outputting it as a digital value;
A received data storing step of storing the received data d1 (n) by the set number (n) of digital values of the signal components output in the filter amplification digital output step;
A maximum value max and a minimum value min with respect to the received data d1 (n) stored in the received data storing step and a maximum minimum difference (dd (n)) corresponding to the difference between the maximum value and the minimum value mxmin) and a kurtosis (kurt);
(Mx1) value and a maximum value (max) calculated from the above-mentioned upper-side number% setting (mx1) value set in advance in the received data d1 Calculating an upper side number calculation value mx4 corresponding to the number of data equal to or larger than the reference number mx3, mx3 = max- (mxmin * mx1 / 100);
(Mn1) value and a minimum value (min) calculated in the lower-number-side number setting (mn1) set in advance in the received data d1 A lower number calculation value calculation step of calculating a lower number number calculation value mn4 corresponding to the number of data of the reference value mn3, mn3 = min + (mxmin * mn1 / 100) or less;
(Condition d) and the lower-side number calculation value mn4 should be smaller than the predetermined lower-side number reference value mn2 (i.e., the lower-side-side number calculation value mn2 must be smaller than the upper-side-side number reference value mx2) (T_f) is satisfied if one of the two conditions (condition d and condition e) of the condition (condition e) is satisfied and if both conditions are not satisfied, the T calculation function (t_f) 0, TDATA (TDATA = t_f * mxmin * std) which is obtained by multiplying the T calculation function (t_f) by the maximum minimum difference (mxmin) and the kurtosis (kurt) ;
Determining an insulation state of the power device by comparing the TDATA value calculated in the TDATA calculation step with a preset TDATA boundary value Ts.

Images