KR20040061774A - Deterioration daiagnosis measuring apparatus for lightning arrester according by using leakage current wave height analysis - Google Patents

Abstract

PURPOSE: An apparatus is provided to reduce costs by measuring the leakage current for third harmonic waves and leakage current for resistance through the use of programs. CONSTITUTION: An apparatus comprises a current transformer(2) for measuring the leakage current of a lightning arrester(1); a signal processor(3) for processing the leakage current signal detected by the current transformer; a voltage distributor(7) for distributing and outputting voltages; an atmospheric temperature sensor(8) for detecting an atmospheric temperature; a data acquisition unit(9) for receiving the amplified signal of the leakage current amplified and output from a differential amplifying unit(13) of the signal processor, receiving the voltage output from the voltage distributor, receiving the atmospheric temperature signal detected by the atmospheric temperature sensor, and converting the received signals into digital signals; and a personal computer(10) for receiving the digitalized amplified leakage current, phase of power voltage and atmospheric temperature data output from the data acquisition unit, and judging a degradation of a lightning arrester by performing an arithmetic operation on the received data in accordance with an algorithm.

Description

Deterioration diagnosis measuring device of lightning arrester by leakage current crest analysis {DETERIORATION DAIAGNOSIS MEASURING APPARATUS FOR LIGHTNING ARRESTER ACCORDING BY USING LEAKAGE CURRENT WAVE HEIGHT ANALYSIS}

The present invention relates to an apparatus for measuring degradation diagnosis of an arrester by leak current crest analysis.

Conventionally, the timing of replacing the arrester installed in the power transmission / distribution and substation system of the power system is judged by the number of surge counters installed in the arrester, and when there is a certain number of surges regardless of the deterioration state, it is called a deterioration arrester. Judging, the arrester was replaced.

However, when the number of surge operations is counted to determine that the surge arrester that has generated a certain number of surges is a deteriorated lightning arrester, the deterioration state of the arrester may not be accurately determined and the replacement time may be overlooked, resulting in an accident in the power system. There have been problems such as replacement of still available lightning arresters, resulting in economic losses.

Recently, a lightning arrester applied to a gas insulated switchgear (GIS) is expensive, and in this case, a total leakage current measuring instrument is installed in addition to the surge counter, and the leakage current value is recorded through a round-trip inspection of the field operator. After that, it was judged whether the arrester was abnormal.

However, the total leakage current of the arrester consists of a capacitive current and a resistance current, and only the resistance current increases with the degree of deterioration. In case of new lightning arrestors, most of them are capacitive currents and the resistance current occupies about 5 ~ 20%. Therefore, even if the deterioration progresses and the resistance current increases twice, the total leakage current does not increase significantly, and there is a problem in that the deterioration state of the arrester cannot be reliably determined.

As described above, in order to diagnose deterioration of the arrester, a measuring device capable of measuring only the total leakage current, a total leakage current / resistance leakage current measuring device, or a total leakage current / third harmonic leakage current measuring device is separately attached to the arrester. Although it is applied for continuous monitoring / circuit checking, the final output values are processed by hardware. For this reason, these devices are generally difficult to apply because of the high price. In addition, a device that can measure the total leakage current / resistance leakage current / third harmonic leakage current as a single body is not commercially available. In addition, since the device is configured only with hardware, it is difficult to process data such as wave height analysis, and thus, there is a problem in that it is not possible to provide enough detailed information necessary for diagnosing the arrester degradation.

The present invention has been made to solve various problems as described above, and an object of the present invention is to analyze the measurement portion of the third harmonic leakage current and the resistance leakage current by a program to leak current crest analysis that significantly reduced the measurement cost. The present invention provides a diagnostic apparatus for deterioration of an arrester.

Another object of the present invention is to provide an apparatus for diagnosing deterioration of an arrester by leak current crest analysis, which is integrally configured to simultaneously measure total leakage current, resistance leakage current, and third harmonic leakage current.

Another object of the present invention is to operate the arrester according to the theory that even in the case of lightning arresters having the same leakage current value by the wave height analysis, the center of gravity or the wave height distribution occurs in the first half of the degradation and occurs later in the second half as the degradation progresses. An object of the present invention is to provide an apparatus for diagnosing deterioration of an arrester by leak current crest analysis, which can accurately diagnose deterioration of an arrester by comparing initial states.

In order to achieve the above object, the present invention provides a current transformer for measuring leakage current of an arrester, a signal processor for receiving and processing a leakage current signal detected by the current transformer, a voltage divider for dividing and outputting a voltage, and detecting an atmospheric temperature. Receives an amplification signal of the leakage current output by differentially amplified by the differential amplification means of the signal processor through the leakage current output terminal, receives the divided voltage output from the voltage divider, and at the same time, Data acquisition means for receiving the ambient temperature signal detected by the digital signal and converting the digital signal into digital signals; Characterized in that it comprises a personal computer for judging deterioration of the arrester. The.

1 is a block diagram schematically illustrating an apparatus for measuring degradation diagnosis of an arrester by leak current crest analysis according to an embodiment of the present invention;

2 is a block diagram schematically showing a personal computer in which an algorithm applied to an embodiment of the present invention is incorporated;

3 is a diagram illustrating an example of measuring leakage current wave height distribution by using an arrester degradation diagnosis measuring apparatus using a leak current wave height analysis according to an exemplary embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

1: lightning arrester 2: current transformer

3: signal processor 4: power input terminal

5: Leakage current measuring terminal 7: Voltage divider

8: Ambient temperature detection sensor 9: Data acquisition means

11: Surge protection means 12: Power conversion means

13: Differential amplification means 14: RMS / DC converter

15: Voltage / Current Converter 16: Total Leakage Current Output Terminal

100: personal computer 117: band pass filter algorithm

118: Third harmonic leakage current maximum value algorithm

119: Third harmonic leakage current rms algorithm

120: third harmonic leakage current average value algorithm

121: 3rd harmonic current spectrum analyzer

122: Maximum total leakage current algorithm

123: total leakage current average value algorithm

124: total leakage current rms algorithm

125: Whole Leakage Current Spectrum Analyzer

126: phase differential amplifier 127: power supply voltage algorithm

128: voltage spectrum analyzer 129: database

130: monitor

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration and operation of the arrester by the leakage current crest analysis according to an embodiment of the present invention.

1 is a block diagram schematically illustrating an apparatus for measuring degradation diagnosis of an arrester based on a leakage current crest analysis according to an embodiment of the present invention, and FIG. 2 is a personal computer incorporating an algorithm applied to an embodiment of the present invention. 3 is a block diagram schematically illustrating the leakage current wave height distribution measurement example by using the apparatus for diagnosing degradation of the arrester by the leakage current wave height analysis according to an embodiment of the present invention.

As shown in FIGS. 1 to 3, an apparatus for diagnosing degradation of an arrester based on a leakage current crest analysis according to an embodiment of the present invention includes a current transformer 2 (the current transformer 2 that measures a leakage current of an arrester 1). ) Uses a through-flow current transformer for measuring or a clamp current transformer for checking cycles), a signal processor 3 for receiving and processing a leakage current signal detected by the current transformer 2, and a voltage divider for dividing and outputting a voltage. (7), an ambient temperature detection sensor (8) for detecting the ambient temperature, and a leakage current amplification signal (16) which is differentially amplified and output by the differential amplification means (13) of the signal processor (3). Data acquisition means (9) for receiving the divided voltage output from the voltage divider (7) and receiving the ambient temperature signal detected by the atmospheric temperature detection sensor (8) and converting it into a digital signal. And the data acquisition number It consists of a personal computer 100 which receives the digitized amplified leakage current, the phase of the power supply voltage and the atmospheric temperature data output from the stage 9 and calculates the degradation of the arrester by performing arithmetic processing according to an embedded algorithm.

The signal processor 3 receives power leakage means 12 for receiving AC power through a power input terminal 4 and converting it into DC power, and a lightning arrester 1 detected by the current transformer 2. At the same time, differential amplifying means 13 for receiving and amplifying differentially the DC voltage output from the power conversion means 12, surge protection means 11 for protecting the internal circuit from excessive surge voltage applied from the outside, and Receives an RMS / DC converter 14 for receiving an amplified signal of the leakage current differentially amplified by the differential amplification means 13 and converts it into a DC voltage, and receives the DC voltage data of the leakage current output from the RMS / DC converter 14. It consists of a voltage / current converter 15 which converts into DC current data and outputs it to the leakage current measuring terminal 5.

The personal computer 100 computes and processes the third harmonic leakage current data, and simultaneously performs spectral analysis, and receives total leakage current data, total leakage current spectrum analysis data, and voltage spectrum analysis data to calculate and process the wave height analysis data. A band pass for receiving a signal output from the data acquiring means 9 through the base 129 and the total leakage current output terminal 16 of the signal processor 3 and detecting a third harmonic leakage current of only 180 Hz component. A filter algorithm 117, a leakage current maximum value algorithm 118 that detects the maximum value of the third harmonic leakage current output from the band pass filter algorithm 117, and outputs it to the database 129, and the leakage current maximum Third harmonic leakage current rms algorithm 119 for detecting a third harmonic leakage current rms value by dividing √2 by the maximum value output from the value algorithm 118 A third harmonic leakage current average value algorithm for averaging the maximum value output from the third harmonic leakage current maximum value algorithm 118 over a measurement time to detect the third harmonic leakage current average value and outputting the third harmonic leakage current average value ( 120) and the third harmonic leakage current rms value output from the third harmonic leakage current rms algorithm 119 is carried out to analyze the peak frequency of the leakage current for 1 minute to output to the database 129. The maximum harmonic leakage current spectrum analyzer 121 and the total leakage current maximum value are detected from the signals output through the data acquisition means 9 via the total leakage current output terminal 16 of the signal processor 3, The maximum leakage current maximum algorithm 122 output to the database 129 and the maximum value output from the maximum leakage current maximum algorithm 122 are measured with respect to the measurement time. The total leakage current effective value is obtained by dividing the total leakage current average value algorithm 123 for detecting the averaged value and outputting it to the database 129 and the maximum value output from the total leakage current maximum value algorithm 122 by √2. Receives the total leakage current RMS value 124 to detect and output, and the total leakage current RMS value output from the total leakage current RMS value 124 analyzes the entire current spectrum to output to the database 129 The total leakage current spectrum analyzer 125, the power supply voltage algorithm 127 for receiving and outputting the voltage output from the voltage divider 7, and the voltage output from the power supply voltage algorithm 127, and at the same time, A phase differential amplifier 126 that detects a phase difference and differentially amplifies the received leakage current rms value output from the leakage current rms algorithm 124. A voltage spectrum analyzer 128 for receiving the voltage output from the power supply voltage algorithm 127 and performing a spectrum analysis (wavelength analysis) to output the highest frequency of the power supply voltage for one minute and output the frequency to the database 129; The monitor 130 is configured to display a wave height distribution graph of the arrester 1 output from the database 129.

The surge protection means 11 preferably uses a capacitor.

Next, the operation and effects of the arrester degradation diagnosis measuring apparatus by the leakage current crest analysis according to an embodiment of the present invention configured as described above will be described in detail.

The total leakage current flowing through the arrester 1 or the ZnO element at the normal operating voltage is detected using the current transformer 2 in the range of 100 mA to several mA. In order to improve the accuracy and stability of the measurement due to the high electric field and external noise around the lightning arrester 1, the current transformer 2 is electrostatically shielded, and the amplification of the signal detected from the current transformer 2 is performed by the differential amplification means 13. The leakage current response sensitivity was calibrated to 1V / 1㎃. The signal processor 3 requires accurate measurement of the fundamental wave and the third harmonic of the leakage current, so that signal distortion is not generated in the frequency band of 1 kHz or less.

The personal computer 100 incorporating an analysis algorithm is applied to various types of algorithms (band filter algorithm, frequency analysis algorithm, crest analyzer) from the input signal (total leakage current, power supply voltage, temperature) and the lightning arrester 1. The information necessary for diagnosing degradation can be obtained. Details are as follows.

① Frequency spectrum, effective value, maximum value and average value of total leakage current, resistance leakage current, and third harmonic leakage current

② Frequency spectrum and rms value of power supply voltage

③ Phase difference between power supply voltage and total leakage current

④ Crest Distribution of Total Leakage Current

⑤ ambient temperature

The bandpass filter algorithm 117 for detecting the 180 Hz component, the third harmonic leakage current of the total leakage current, is formed by connecting a high pass filter and a low pass filter in series, and the two filters are Butterworth. The order of the filter was set to 15, and the low cutoff frequency of the filter was set to 175 kHz and the high cutoff frequency of 185 kHz.

According to the program flow diagram shown in FIG. 2, the peak leakage frequency obtained for 1 minute indicates the crest analysis as shown in FIG. 3.

When the leakage current of the arrester 1 in operation is detected as a small voltage signal from the current transformer 2, the signal is transmitted to the signal processor 3 behind the current transformer 2. In the signal processor 3, the differential amplification means 13 amplifies the leakage current differentially, and the differentially amplified AC voltage signal is converted into a DC voltage signal by the RMS / DC converter 14, and then the voltage / current converter 15 Is converted into a DC current signal and transmitted to the communication board (not shown) through the leakage current measuring terminal (5).

In addition, the branched signal among the AC voltage signals amplified by the differential amplifying means 13 is inputted to the data acquiring means 9 through the entire leakage current output terminal 16 and amplified by the differential amplifying means 13. The personal computer 100 digitizes the AC voltage signal of the leakage current and the voltage signal input from the voltage divider 7 and the atmospheric temperature signal input from the atmospheric temperature detection sensor 8 by the data acquisition means 9, respectively. The personal computer 100 receives these signals and performs final signal analysis according to a signal analysis algorithm program embedded therein, so that the monitor 130 outputs the number of waves per minute for the leakage current, that is, the wave height distribution. Express.

2 shows a process of signal processing the signal transmitted through the data acquisition means 9 in the computer 100 in which the signal analysis algorithm program is embedded. First, the third harmonic leakage current among the components of the arrester 1 leakage current detects the leakage current of only 180 mA through the bandpass filter algorithm 117, and the third harmonic leakage current maximum is determined by the later algorithm. The wave height analysis is possible through the third harmonic leakage current maximum value algorithm 118, the third harmonic leakage current rms value algorithm 119, and the current spectrum analyzer 121.

As for the total leakage current, the total leakage current maximum value algorithm 122 and the total leakage current average value algorithm 123 are data-formed, and the total leakage current rms value algorithm 124 is used to obtain the resistance leakage current. The power supply voltage transmitted through the voltage divider 7 is dataed as a resistance leakage current by performing phase difference detection and signal amplification by the phase differential amplifier 126 on the effective value of the power supply voltage algorithm 127 and the total leakage current. It is output to the database 129.

In addition, the effective value of the total leakage current output from the total leakage current effective value algorithm 124 is analyzed by the total leakage current spectrum analyzer 125 and outputted to the database 129 to supply the power supply voltage algorithm 127. The power supply voltage outputted from the voltage spectrum analyzer 128 analyzes the crest height and outputs the data to the database 129.

Thus, as shown in FIG. 3, the data inputted to the database 129 has a crest distribution displayed on the monitor 130. In FIG. 3, graph A shows the maximum number of crests per minute when the leakage current of the arrester used for one year is around 0.24 mA, and graph B shows the maximum number of crests per minute when the leakage current of the arrester used for one year is around 0.23 mA. The graph C shows the maximum number of crests per minute when the leakage current of the lightning arrester used for 15 years is around 0.45 mA.

Accordingly, it can be seen from the graph shown in FIG. 3 that C is a lightning arrester having a large leakage current, that is, a deteriorated lightning arrester, and thus, the arrester C needs to be replaced.

In other words, the AC converter 12 receives the AC power through the power input terminal of the signal processor 3 to convert the DC power into DC power, and differentially detects the leakage current signal of the arrester 1 detected by the current transformer 2. At the same time as received by the amplifying means 13, the DC voltage output from the power conversion means 12 is received by the differential amplifying means 13 and differentially amplified, and the amplification of the leakage current differentially amplified by the differential amplifying means 13 The signal is received by the RMS / DC converter 14 and converted into a DC voltage.The DC voltage data of the leakage current output from the RMS / DC converter 14 is received by the voltage / current converter 15 and converted into DC current data. Output to leakage current measuring terminal (5).

At this time, the excessive surge voltage applied from the outside protects the internal circuit by the surge protection means (11).

Then, the band pass filter algorithm 117 receives the signal output from the data acquisition means 9 via the total leakage current output terminal 16 of the signal processor 3 of the personal computer 100, and only the 180 kHz component. The third harmonic leakage current of the third harmonic leakage current maximum value algorithm 118 to detect the maximum value of the third harmonic leakage current among the signals output from the band pass filter algorithm 117, the database 129 ) And receive the maximum value output from the third harmonic leakage current maximum value algorithm 118 from the third harmonic leakage current rms algorithm 119, and divide √2 to detect the third harmonic leakage current rms value. In addition, the third harmonic obtained by the third harmonic leakage current average value algorithm 120 receives the maximum value output from the third harmonic leakage current maximum value algorithm 118 and is averaged over the measurement time. The leakage current average value is detected and output to the database 129, and the third harmonic leakage current rms value output from the third harmonic leakage current rms algorithm 119 is received and parsed by the current spectrum analyzer 121. The analysis is performed to detect the peak frequency of the leakage current for one minute and output it to the database 129.

In addition, the maximum leakage current maximum value algorithm 122 detects the maximum leakage current value among the signals output through the data acquisition means 9 via the total leakage current output terminal 16 of the signal processor 3. The total leakage current outputted to the base 129 and outputted from the total leakage current maximum value algorithm 122 by the total leakage current average value algorithm 123 is detected and averaged with respect to the measurement time. 129, and dividing the maximum value of the total leakage current output by the total leakage current maximum value algorithm 122 by? 2 in the total leakage current rms algorithm 124 to detect the total leakage current rms value, and The total leakage current rms value output from the total leakage current algorithm 124 is received from the total leakage current spectrum analyzer 125, and the current spectrum is analyzed. And outputs it to the base site (129).

The voltage output from the voltage divider 7 is received by the power supply voltage algorithm 127 and the phase differential amplifier 126 receives the effective value of the total leakage current output from the total leakage current rms algorithm 124. At the same time as detecting the phase difference, it is differentially amplified and output to the database 129, and the voltage spectrum analyzer 128 receives the voltage output from the power supply voltage algorithm 127 to perform spectrum analysis (wavelength analysis). The maximum frequency of the power supply voltage is output for a minute and output to the database 129, and the database 129 displays the wave height distribution graph of the arrester 1, which is input, to the monitor 130, thereby displaying on the monitor 130. The crest distribution graph can be used to analyze the crest from the leakage frequency peak frequency obtained for 1 minute.

Therefore, according to the present invention, it is possible to accurately determine the deterioration of the arrester regardless of the power quality, temperature, etc. of the power system in which the arrester 1 is installed, and perform the peak distribution analysis of the leakage current, Analyze the spectrum to determine the deterioration state of the arrester 1 in consideration of the power quality at all times, and determine the deterioration state of the arrester 1 easily and accurately in consideration of the influence of the magnitude of the leakage current and the wave height distribution according to the change of ambient temperature. Since the deterioration state of the arrester 1 is judged by the wave distribution distribution of the leakage current, even the field manager who does not have much professional knowledge can easily determine the deterioration state of the arrester 1, The system can minimize the blackout accident and the ripple effect due to the arrester deterioration in the system, so that the stable supply of power and the reliability of the power supply can be improved. In addition, the measurement portion of the third harmonic leakage current and the resistance leakage current can be processed by a program to significantly reduce the deterioration measurement cost of the arrester 1, as well as the total leakage current, the resistance leakage current, and the third The arrester 1 diagnoses the deterioration of the arrester by an integrated leakage current crest analysis to measure the harmonic leakage current at the same time, and also has the same leakage current value by the crest analysis. Occurs in the first half, but deterioration of the arrester 1 is diagnosed by comparing the initial state of the arrester 1 with the wave analysis according to the theory that it occurs in the second half as the deterioration progresses. Can be diagnosed.

As described above, according to the lightning arrester degradation diagnosis measuring apparatus according to the leakage current crest analysis of the present invention, a current transformer for measuring the leakage current of the arrester, a signal processor for receiving and processing the leakage current signal detected by the current transformer, and the voltage distribution And a voltage divider outputted from the voltage divider to receive an amplification signal of the leakage current output by differential amplification and output by the differential temperature amplification means of the signal processor. A data acquisition means for receiving the converted voltage and receiving the ambient temperature signal detected by the ambient temperature sensor and converting the signal into a digital signal, and the digitized amplified leakage current and the phase of the power supply voltage outputted from the data acquisition means. Receive air temperature data and process it according to the built-in algorithm. Since the personal computer is provided to determine the deterioration of the arrester, it is possible to accurately determine the deterioration of the arrester regardless of the power quality, temperature, etc. of the power system in which the arrester is installed. By analyzing the leakage current spectrum, it is always possible to judge the deterioration state of the arrester by considering the power quality, and to determine the deterioration state of the arrester easily and accurately by considering the influence of the leakage current size and the crest distribution according to the change of ambient temperature. The deterioration state of the arrester is judged by shifting the distribution of leakage current, so that the field manager who does not have a lot of professional knowledge can easily determine the deterioration state of the arrester. Stable supply of power and trust in power supply can be minimized the ripple effect There is an effect that can improve the sex.

In addition, according to the lightning arrester degradation diagnosis measuring apparatus according to the leakage current crest analysis of the present invention, the measurement portion of the third harmonic leakage current and the resistance leakage current can be processed by a program to significantly reduce the degradation measurement cost of the arrester as well as The arrester diagnoses the deterioration of the arrester by an integrated leakage current wave analysis to measure the total leakage current, the resistance leakage current and the third harmonic leakage current at the same time, and the arrester having the same leakage current value by the wave analysis. According to the theory that in the early stage of deterioration, the center of crest or distribution of crest occurs in the first half, but occurs later in the second half as the deterioration progresses. There is an effect that can be diagnosed.

Claims (5)

A current transformer 2 for measuring the leakage current of the arrester 1, a signal processor 3 for receiving and processing the leakage current signal detected by the current transformer 2, a voltage divider 7 for dividing and outputting a voltage; The amplification signal of the leakage current which is differentially amplified and output from the differential amplification means 13 of the signal processor 3 and the atmospheric temperature detection sensor 8 for detecting the atmospheric temperature are received through the leakage current output terminal 16. And a data acquiring means (9) for receiving the divided voltage output from the voltage divider (7) and receiving the atmospheric temperature signal detected by the atmospheric temperature detection sensor (8) and converting it into a digital signal, respectively; And a personal computer 10 which receives the digitized amplified leakage current, the phase of the power supply voltage and the atmospheric temperature data output from the acquiring means 9, and calculates the deterioration of the arrester by arithmetic processing according to an embedded algorithm. Degradation diagnostic measuring device for lightning protection by analyzing the leakage current to dig into. 2. The signal processor (3) according to claim 1, wherein the signal processor (3) includes power conversion means (12) for receiving AC power through a power input terminal and converting the power into DC power, and a leakage current of the arrester (1) detected by the current transformer (2). At the same time receiving the signal, the differential amplifying means 13 for receiving and amplifying the DC voltage output from the power conversion means 12, and the surge protection means for protecting the internal circuit from excessive surge voltage applied from the outside. And an RMS / DC converter 14 which receives an amplified signal of the leakage current differentially amplified by the differential amplifier 13 and converts it into a DC voltage, and a DC voltage of the leakage current output from the RMS / DC converter 14. And a voltage / current converter (15) for receiving data and converting the data into DC current data and outputting the same to the leakage current measurement terminal (5). The personal computer 100 analyzes and processes the third harmonic leakage current data and simultaneously performs spectral analysis. The personal computer 100 receives the total leakage current data, the total leakage current spectrum analysis data, and the voltage spectrum analysis data. The third harmonic leakage of only 180 Hz component is received by receiving the signal output from the data acquisition means 9 through the database 129 for calculating data and the total leakage current output terminal 16 of the signal processor 3. A band pass filter algorithm 117 for detecting current and a maximum leakage current algorithm 118 for detecting the maximum value of the third harmonic leakage current output from the band pass filter algorithm 117 and outputting the result to the database 129. And a third harmonic leakage current rms for detecting a third harmonic leakage current rms value by dividing √2 by the maximum value output from the leakage current maximum algorithm 118. A third value that averages the maximum value output from the value algorithm 119 and the third harmonic leakage current maximum value algorithm 118 over the measurement time, detects the third harmonic leakage current average value, and outputs it to the database 129. The harmonic leakage current average value algorithm 120 and the third harmonic leakage current rms value output from the third harmonic leakage current rms algorithm 119 are subjected to wave analysis to detect peak frequency of the leakage current for 1 minute. Total leakage from the signal output through the data acquisition means 9 via the third harmonic leakage current spectrum analyzer 121 output to the base 129 and the total leakage current output terminal 16 of the signal processor 3. The maximum leakage current maximum value algorithm 122 for detecting the current maximum value and outputting it to the database 129 and the maximum value output from the total leakage current maximum value algorithm 122 are described. The total leakage current average value algorithm 123 for detecting the average value over time and outputting it to the database 129 and the maximum value output from the maximum leakage current maximum value algorithm 122 are divided by √2 for total leakage. The total leakage current RMS value 124 for detecting and outputting the current RMS value and the total leakage current RMS value output from the total leakage current RMS value 124 are analyzed, and the entire current spectrum is analyzed to determine the database 129. Receiving a voltage output from the total leakage current spectrum analyzer 125, a power supply voltage algorithm 127 for receiving and outputting a voltage output from the voltage divider 7, and At the same time, the phase of the differential leakage amplification while detecting the phase difference by receiving the total leakage current RMS value output from the total leakage current RMS value algorithm 124. A voltage spectrum analyzer that receives the voltage output from the power amplifier 126 and the power supply voltage algorithm 127, performs spectrum analysis (wavelength analysis), and outputs the highest frequency of the power supply voltage to the database 129 for 1 minute. (128) and a monitor (130) for displaying a wave height distribution graph of the arrester (1) output from the database (129). 2. The apparatus for diagnosing deterioration of an arrester according to claim 1, wherein the current transformer (2) is a through-flow current transformer for measurement. 2. The apparatus for diagnosing deterioration of an arrester according to claim 1, wherein the current transformer (2) is a clamp-type current transformer for periodic inspection.