KR20220061850A - Method for evaluating long-term reliability of lightning arrester and system thereof - Google Patents

Abstract

The present invention relates to a system for evaluating long-term reliability of an arrester element and a system thereof. The system includes: a deterioration composition device for creating deterioration environmental conditions for evaluating long-term reliability of the arrester element; a reliability data detection device for generating and applying a predetermined maximum continuous operating voltage (MCOV) to the arrester element, and measuring a current leaked from the arrester element; and a reliability analysis device for detecting the resistive leakage current of the arrester element based on the voltage/current data received from the reliability data detection device and evaluating the long-term reliability of the corresponding element based on a change pattern of the detected resistive leakage current.

Description

Long-term reliability evaluation method and system for lightning arrester element

The present invention relates to a method and system for evaluating long-term reliability of a lightning arrester element, and more particularly, to a method and system for evaluating long-term reliability based on a resistive leakage current of an arrester element.

A lightning arrester is one of the important power devices to protect transmission lines and generators and transformers by absorbing electrical energy such as lightning surges, switching surges, and temporary overvoltages invading the power system. In particular, zinc oxide (ZnO) arresters have excellent surge protection characteristics and are rapidly applied to power systems, and have eliminated the series gap due to their excellent nonlinear resistance characteristics. In addition, the zinc oxide (ZnO) arrester has a more compact structure, convenience in manufacturing, and very fast response time to transient voltage, so there is no transient phenomenon and almost no fast flow. However, the zinc oxide (ZnO) arrester has a disadvantage in that a small leakage current flows because it is exposed to a dedicated power source at all times as well as stress caused by a lightning surge and a switching surge.

Although it is common to measure the operation start voltage, limit voltage, loss power, leakage current, and capacitance of the arrester in such a technology for diagnosing the deterioration of the arrester, among them, it is easy to measure the deterioration of the arrester in operation, so it is easy to measure the leakage current. A method of diagnosing deterioration using The constant minute leakage current (total leakage current) flowing through the arrester is expressed as a combination of the capacitive leakage current and the resistive leakage current, and the resistive leakage current mainly increases due to the deterioration of the arrester, but the capacitive leakage current hardly changes. As a result of prolonged use, the resistive leakage current of the arrester element increases due to natural or artificial deterioration, and the amount of heat is increased. They do not perform their roles sufficiently and cause accidents. Therefore, the resistive leakage current becomes an important measure for deterioration diagnosis.

However, the simple method of diagnosing the lightning arrester based on the leakage current is to replace the increase in the resistive leakage current due to the deterioration of the current, and simply to calculate the root mean square (RMS) and the maximum value of the leakage current and the third harmonic leakage current component. Since it is judged by the maximum value, it is not possible to sufficiently provide information necessary for the diagnosis of deterioration, including errors depending on the measurement method and the installation environment. In addition, although direct measurement of the resistive leakage current gives better quality information to the deterioration diagnosis, various complex auxiliary circuits are required to directly measure the resistive leakage current. Representative methods include the compensation circuit method, the third harmonic measurement method, and the magnetic elimination method, etc.

Most of the arresters currently used in the power system are replaced by a batch after a certain period of time regardless of damage or performance degradation due to an accident, which is technically and economically unreasonable. Therefore, there is a demand for technology development related to an economical arrester replacement cycle notification system and accident prevention system through accurate analysis and prediction of the arrester's performance.

SUMMARY OF THE INVENTION The present invention aims to solve the above and other problems. Another object is to detect a resistive leakage current of a corresponding device by applying a predetermined maximum continuous operating voltage (MCOV) to the arrester device for a long time, and based on the detected resistive leakage current, long-term reliability of the device To provide a method and a system for evaluating

According to one aspect of the present invention in order to achieve the above or other objects, there is provided a device comprising: a deterioration composition device for creating a deterioration environment condition for evaluating the long-term reliability of a lightning arrester element; a reliability data detection device for generating a predetermined maximum continuous operating voltage (MCOV), applying it to the arrester element, and measuring a current leaking from the arrester element; and a reliability analysis device for detecting a resistive leakage current of the lightning arrester element based on voltage/current data received from the reliability data detecting device, and evaluating long-term reliability of the device based on a change pattern of the detected resistive leakage current. It provides a long-term reliability evaluation system that includes. Here, the deterioration composition device is characterized in that it creates a high-temperature environment required by international test standards.

More preferably, the reliability data detection device comprises: a manipulation unit for allowing a system operator to select at least one of a type and a magnitude of a maximum continuous operating voltage (MCOV) to be applied to the lightning arrester element; a voltage supply unit for generating a maximum continuous operation voltage (MCOV) selected through the manipulation unit and applying the generated maximum continuous operation voltage (MCOV) to the arrester element; and a leakage current detection unit that measures the total current leaked from the lightning arrester element using an ammeter when the maximum continuous operation voltage (MCOV) is applied.

More preferably, the reliability analysis apparatus includes: a data collection unit for collecting data on a voltage applied to the lightning arrester element from the reliability data detection apparatus and data on a current leaking from the lightning arrester element; a resistive leakage current detection unit configured to detect a resistive leakage current of the lightning arrester element based on the voltage and current data stored in the data collection unit; and a reliability evaluation unit that detects a resistive leakage current change pattern of the lightning arrester element over time and evaluates long-term reliability of the corresponding element based on the detected resistive leakage current change pattern. The resistive leakage current detector detects the resistive leakage current of the lightning arrester device by using at least one of a Watt Loss measuring technique, a Median measuring technique, an in-phase measuring technique, and a DC measuring technique.

More preferably, the reliability analysis device further comprises a user input unit for receiving a user input related to the long-term reliability evaluation of the lightning arrester element, wherein the user input is a user input for setting a deterioration environment condition and a long-term reliability evaluation time. It is characterized in that it includes a user input for setting.

A method for evaluating long-term reliability of a lightning arrester device according to embodiments of the present invention and an effect of the system will be described as follows.

According to at least one of the embodiments of the present invention, there is an advantage in that the long-term reliability of the device can be accurately evaluated by monitoring the change pattern of the resistive leakage current of the lightning arrester device in real time under the deterioration environmental condition set by the system operator.

However, the effects that can be achieved by the method for evaluating the long-term reliability of the lightning arrester device and the system according to the embodiments of the present invention are not limited to those mentioned above, and other effects not mentioned are from the following description to which the present invention belongs. It will be clearly understood by those of ordinary skill in the art.

1 and 2 are diagrams showing the configuration of a long-term reliability evaluation system according to an embodiment of the present invention;
3 is a diagram showing the configuration of a reliability data detection apparatus according to an embodiment of the present invention;
4 is a view showing an external appearance of a device for detecting reliability data according to an embodiment of the present invention;
5 is a view showing the configuration of a reliability analysis apparatus according to an embodiment of the present invention;
6 is a view showing the configuration of the resistive leakage current detection unit shown in FIG. 5;
7 is a view showing an example of a user interface screen of the reliability analysis apparatus;
8 and 9 are diagrams illustrating waveforms of applied voltage and leakage current of a lightning arrester element;
10 is a diagram illustrating a long-term reliability evaluation graph according to a change in resistive leakage current of a lightning arrester element;
11 is a flowchart illustrating a method for evaluating long-term reliability of a lightning arrester device according to an embodiment of the present invention.

Hereinafter, the embodiments disclosed in the present specification will be described in detail with reference to the accompanying drawings, but the same or similar components are assigned the same reference numbers regardless of reference numerals, and redundant description thereof will be omitted. The suffixes "module" and "part" for components used in the following description are given or mixed in consideration of only the ease of writing the specification, and do not have distinct meanings or roles by themselves. In addition, in describing the embodiments disclosed in the present specification, if it is determined that detailed descriptions of related known technologies may obscure the gist of the embodiments disclosed in this specification, the detailed description thereof will be omitted. In addition, the accompanying drawings are only for easy understanding of the embodiments disclosed in the present specification, and the technical idea disclosed herein is not limited by the accompanying drawings, and all changes included in the spirit and scope of the present invention , should be understood to include equivalents or substitutes.

The present invention provides a method for detecting a resistive leakage current of a corresponding device by applying a predetermined maximum continuous operating voltage (MCOV) to a lightning arrester device for a long time, and evaluating the long-term reliability of the device based on the detected resistive leakage current, and a method thereof propose a system.

Hereinafter, various embodiments of the present invention will be described in detail with reference to the drawings.

1 and 2 are diagrams showing the configuration of a long-term reliability evaluation system according to an embodiment of the present invention.

1 and 2 , a long-term reliability evaluation system 100 according to an embodiment of the present invention includes a deterioration composition device 110 , a reliability data detection device 120 , and a reliability analysis device 130 .

The deterioration composition apparatus 110 may create deterioration environmental conditions for evaluating the long-term reliability of the lightning arrester element 50 . For example, the deterioration composition device 110 may provide a high-temperature environment required by international test standards (eg, IEC 60099-5, IEC 61643-331, etc.) to the lightning arrester device 50 .

The reliability data detection device 120 generates a maximum continuous operating voltage (MCOV) according to an operation command of a system operator, and converts the generated maximum continuous operating voltage (MCOV) to the lightning arrester element 50 disposed in the deterioration composition device 110 . ) can be supplied.

The reliability data detection apparatus 120 may measure a current leaking from the lightning arrester device 50 when the maximum continuous operating voltage MCOV is applied, and store the measured current in a memory.

The reliability data detection apparatus 120 may detect a voltage waveform supplied to the lightning arrester element 50 and a current waveform leaking from the lightning arrester element 50 , respectively, and output them to the display unit. In addition, the reliability data detection apparatus 120 may collect data on a voltage supplied to the lightning arrester element 50 and data on a current leaking from the lightning arrester element 50 and provide the data to the reliability analysis apparatus 130 .

The reliability analysis apparatus 130 may set a deterioration environmental condition, a long-term reliability evaluation time, a type and size of power applied to the lightning arrester device 50 , etc. according to a setting command of a system operator.

The reliability analysis apparatus 130 may detect a resistive leakage current of the lightning arrester device 50 based on the voltage/current data received from the reliability data detection apparatus 120 . In this case, the reliability analysis apparatus 130 may detect the resistive leakage current of the lightning arrester device 50 using a Watt Loss measurement method, a Median measurement method, an in-phase measurement method, and a DC measurement method.

The reliability analysis device 130 detects the resistive leakage current change pattern of the lightning arrester element 50 over time, and evaluates the long-term reliability of the corresponding element 50 based on the detected resistive leakage current change pattern, and the system operator can be provided to Here, the long-term reliability evaluation of the lightning arrester element 50 means evaluating the long-term aging characteristics of the lightning arrester element 50 .

The reliability analysis device 130 detects the applied voltage waveform of the lightning arrester element 50, the total leakage current waveform of the lightning arrester element 50, the resistive leakage current waveform, the capacitive leakage current waveform, and the like, and visualizes the detected waveforms. can be provided to the system operator.

Meanwhile, in the present embodiment, the reliability data detection device 120 and the reliability analysis device 130 are exemplified to be independently configured, but the present invention is not limited thereto. ) may be integrally formed will be apparent to those skilled in the art.

As described above, the long-term reliability evaluation system according to an embodiment of the present invention can accurately evaluate the long-term reliability of the element by monitoring the resistive leakage current change pattern of the lightning arrester element in real time under the deterioration environmental condition set by the operator. there is.

3 is a diagram showing the configuration of a reliability data detection apparatus according to an embodiment of the present invention, and FIG. 4 is a diagram showing an external appearance of the reliability data detection apparatus according to an embodiment of the present invention.

3 and 4, the reliability data detection apparatus 120, 200 according to an embodiment of the present invention includes an operation unit 210, a communication unit 220, a voltage supply unit 230, a leakage current detection unit 240, It may include a display unit 250 and a memory 260 . The components shown in FIGS. 3 and 4 are not essential for implementing the apparatus for detecting reliable data, so that the apparatus for detecting reliable data described herein may have more or fewer components than those listed above. can

The manipulation unit 210 may provide an input function for allowing the system operator to select the type and/or size of the maximum continuous operating voltage MCOV to be applied to the lightning arrester device 50 . In this case, the type of the maximum continuous operation voltage MCOV includes an AC voltage and a DC voltage.

The manipulation unit 210 may provide a fine control function that allows the system operator to finely adjust the magnitude of the maximum continuous operating voltage MCOV to be applied to the lightning arrester device 50 .

The communication unit 220 may perform a function of providing a communication interface with the reliability analysis apparatus 130 . The communication unit 220 may receive a control signal from the reliability analysis apparatus 130 or transmit applied voltage data and leakage current data to the reliability analysis apparatus 130 . Here, the control signal may include information about the type and magnitude of the voltage applied to the arrester element 50 .

The voltage supply unit 230 may generate a maximum continuous operation voltage (MCOV) set by a system operator and apply the generated maximum continuous operation voltage (MCOV) to the lightning arrester device 50 .

When the maximum continuous operating voltage (MCOV) is applied, the leakage current detection unit 240 may perform a function of measuring the total current leaking from the lightning arrester device 50 using an ammeter. Here, the total current leaked from the arrester element 50 is composed of a capacitive leakage current and a resistive leakage current.

The display unit 250 may display the waveform, rms value, average value and maximum value of the voltage applied to the arrester element 50, and the waveform, rms value, average value, and maximum value of the current leaking from the arrester element 50. there is. In addition, the display unit 250 may display whether a voltage is applied to the lightning arrester element 50 and whether a current leaks from the lightning arrester element 50 .

The memory 260 may store data related to a voltage applied from the voltage supply unit 230 to the lightning arrester device 50 and data related to a current detected by the leakage current detection unit 240 .

5 is a diagram showing the configuration of a reliability analysis apparatus according to an embodiment of the present invention, and FIG. 6 is a diagram showing the configuration of the resistive leakage current detection unit shown in FIG. 5 .

5 and 6 , the reliability analysis apparatuses 130 and 300 according to an embodiment of the present invention include a user input unit 310 , a communication unit 320 , a data collection unit 330 , and a resistive leakage current detection unit 340 . ), a reliability evaluation unit 350 , and a data visualization unit 360 . Here, the leakage current detection unit 340 includes a WL measurement-based current detection module 341 , a Median measurement-based current detection module 342 , an in-phase measurement-based current detection module 343 , and a DC measurement-based current detection module 344 ) may include The components shown in FIGS. 5 and 6 are not essential in implementing the reliability analysis apparatus, so the reliability analysis apparatus described herein may have more or fewer components than those listed above. .

Reliability analysis apparatus (130, 300) described in the present invention is a desktop computer, a notebook computer (laptop computer), a tablet PC (tablet PC), an ultrabook (ultrabook), a smart phone (smart phone) and a wearable device (wearable device) It can be implemented through

The user input unit 310 may perform a function of receiving a user input related to long-term reliability evaluation of the lightning arrester element 50 . In this case, the user input includes a user input for setting a deterioration environmental condition (eg, temperature), a user input for setting a long-term reliability evaluation time (eg, 1000h), and a type and magnitude of voltage applied to the lightning arrester device 50 . It may include a user input for setting , a user input for selecting a type of evaluation data displayed on the user interface screen, and the like.

The communication unit 320 may perform a function of providing a communication interface with the deterioration composition apparatus 110 and the reliability data detection apparatus 120 . The communication unit 320 may transmit a predetermined control signal to the deterioration composition apparatus 110 and the reliability data detection apparatus 120 or receive applied voltage data and leakage current data from the reliability data detection apparatus 120 .

The data collection unit (or memory, 330 ) collects data related to the voltage applied from the reliability data detection device 120 to the lightning arrester element 50 in the deterioration composition device and data about the current leaking from the arrester element 50 . A collection function can be performed. In addition, the memory 330 may store an application or program for evaluating the long-term reliability of the lightning arrester device 50 .

The resistive leakage current detection unit 340 may perform a function of detecting the resistive leakage current of the lightning arrester device 50 based on the voltage/current data stored in the data collection unit 330 . In this case, the resistive leakage current detection unit 340 may detect the resistive leakage current of the lightning arrester device 50 by using at least one of a Watt Loss measuring technique, a Median measuring technique, an in-phase measuring technique, and a DC measuring technique. To this end, the resistive leakage current detection unit 340 includes a WL measurement-based current detection module 341, a Median measurement-based current detection module 342, an in-phase measurement-based current detection module 343 and a DC measurement-based current detection module ( 344) may include at least one of.

The WL measurement-based current detection module 341 uses the rms value and maximum value of power corresponding to the product of the voltage applied to the lightning arrester element 50 and the total leakage current of the arrester element 50 by using the Resistive leakage current can be detected.

Median measurement-based current detection module 342 detects the capacitive leakage current based on the median of values obtained by dividing the total leakage current of the lightning arrester element 50 by the differential value of the applied voltage, and the capacitive leakage current Based on this, the resistive leakage current can be detected.

The in-phase measurement-based current detection module 343 may detect the resistive leakage current of the element 50 by measuring the total leakage current value when the voltage applied to the arrester element 50 has a maximum value.

The DC measurement-based current detection module 344 may measure the total leakage current value when the voltage applied to the arrester device 50 is a DC voltage to detect the resistive leakage current of the corresponding device 50 .

The reliability evaluation unit 350 detects a resistive leakage current change pattern of the lightning arrester element 50 over time, and evaluates the long-term reliability of the element 50 based on the detected resistive leakage current change pattern. can be done For example, when the resistive leakage current change pattern of the lightning arrester element 50 is within a predetermined current range, the reliability evaluation unit 350 may determine that the element 50 has passed the reliability evaluation. On the other hand, when the resistive leakage current change pattern of the lightning arrester element 50 is out of a predetermined current range, the reliability evaluation unit 350 may determine that the element 50 has not passed the reliability evaluation.

The data visualization unit 360 includes a voltage waveform applied to the arrester element 50 , a total leakage current waveform, a resistive leakage current waveform, and a capacitive leakage current waveform of the arrester element 50 , and long-term reliability of the arrester element 50 . It is possible to perform the function of providing the evaluation result to the system operator by visualizing it graphically.

7 is a diagram illustrating an example of a user interface screen of the reliability analysis device, FIGS. 8 and 9 are diagrams illustrating waveforms of applied voltage and leakage current of the lightning arrester element, and FIG. 10 is a change in resistive leakage current of the arrester element. It is a diagram showing a long-term reliability evaluation graph according to the

7 , the reliability analysis apparatus 130 may provide a user interface screen related to long-term reliability evaluation of the lightning arrester element 50 . At this time, the user interface screen includes a voltage waveform display area applied to the lightning arrester element, a total current waveform display area of the lightning arrester element, a resistive leakage current waveform display area of the lightning arrester element, a plurality of tab menus for switching the display contents of the screen, Other various control menus may be included.

When the AC Median Waveform menu is selected from among a plurality of tab menus displayed on the user interface screen, the reliability analysis device 130, as shown in FIG. 50) and the resistive leakage current waveform detected in the Median measurement mode may be detected, respectively, and the detected waveforms may be displayed on the user interface screen.

When the AC Watt Loss Waveform menu is selected from among a plurality of tab menus displayed on the user interface screen, the reliability analysis device 130, as shown in FIG. The total leakage current waveform of (50) and the resistive leakage current waveform detected in the Watt Loss measurement mode may be detected, respectively, and the detected waveforms may be displayed on the user interface screen.

When the AC Time Characteristic menu is selected among a plurality of tab menus displayed on the user interface screen, the reliability analysis device 130, as shown in FIG. 50) may be detected, and the detected data may be visualized and displayed on the user interface screen.

11 is a flowchart illustrating a method for evaluating long-term reliability of a lightning arrester device according to an embodiment of the present invention.

Referring to FIG. 11 , the long-term reliability evaluation system 100 according to an embodiment of the present invention may set deterioration environmental conditions for evaluating the long-term reliability of the lightning arrester device 50 according to an operator setting command ( S1110). Here, the deterioration environmental condition may include a temperature condition stipulated in an international test standard.

The long-term reliability evaluation system 100 may set a test time (hereinafter referred to as 'reliability evaluation test time') for evaluating the long-term reliability of the lightning arrester element 50 according to an operator's setting command ( S1120).

The long-term reliability evaluation system 100 determines the type and magnitude of the MCOV voltage applied to the arrester element 50 according to an operator's setting command, generates the determined MCOV voltage, and applies it to the arrester element 50 . Can be (S1130).

The long-term reliability evaluation system 100 may measure the total current leaking from the arrester device 50 using an ammeter when the MCOV voltage is applied ( S1140 ).

The long-term reliability evaluation system 100 can detect the resistive leakage current of the element 50 based on data about the voltage applied to the arrester element 50 and data about the current leaking from the arrester element 50 . There is (S1150). In this case, the long-term reliability evaluation system 100 may detect the resistive leakage current of the arrester device 50 using at least one of a Watt Loss measurement technique, a Median measurement technique, an in-phase measurement technique, and a DC measurement technique.

The long-term reliability evaluation system 100 may check whether the reliability evaluation test time set by the system operator ends ( S1160 ).

As a result of the check in step 1160 , when the reliability evaluation test time has not expired, the long-term reliability evaluation system 100 may move to step 1130 and repeatedly perform the operations of steps 1130 to 1150 .

Meanwhile, as a result of the confirmation in step 1160 , when the reliability evaluation test time is over, the long-term reliability evaluation system 100 may detect the resistive leakage current change pattern of the arrester element 50 over time ( S1170 ).

The long-term reliability evaluation system 100 may accurately evaluate the long-term reliability of the lightning arrester element 50 based on the resistive leakage current change pattern of the lightning arrester element 50 ( S1180 ).

The long-term reliability evaluation system 100 may visualize the long-term reliability evaluation result of the lightning arrester element 50 and display it on the display unit (S1190). In addition, the long-term reliability evaluation system 100 may visualize the voltage/current waveform related to the long-term reliability evaluation of the lightning arrester device 50 and display it on the display unit.

Meanwhile, in the present embodiment, the detection of the resistive leakage current change pattern of the device is exemplified when the reliability evaluation test time for the lightning arrester device is over, but it is not necessarily limited thereto. Regardless, it will be apparent to those skilled in the art that the resistive leakage current change pattern can be detected.

As described above, in the long-term reliability evaluation method according to an embodiment of the present invention, the long-term reliability of the device can be accurately evaluated by monitoring the resistive leakage current change pattern of the lightning arrester device in real time under the deterioration environmental condition set by the operator. there is.

The present invention described above can be implemented as computer-readable codes on a medium in which a program is recorded. The computer-readable medium includes all types of recording devices in which data readable by a computer system is stored. Examples of computer-readable media include Hard Disk Drive (HDD), Solid State Disk (SSD), Silicon Disk Drive (SDD), ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage device, etc. There is this. Accordingly, the above detailed description should not be construed as restrictive in all respects but as exemplary. The scope of the present invention should be determined by a reasonable interpretation of the appended claims, and all modifications within the equivalent scope of the present invention are included in the scope of the present invention.

100: long-term reliability evaluation system 110: deterioration composition device
120: reliability data detection device 130: reliability analysis device

Claims (6)

a deterioration composition device for creating deterioration environmental conditions for evaluating the long-term reliability of the lightning arrester element;
a reliability data detection device for generating a predetermined maximum continuous operating voltage (MCOV), applying it to the arrester element, and measuring a current leaking from the arrester element; and
A reliability analysis device that detects the resistive leakage current of the lightning arrester element based on voltage/current data received from the reliability data detection device and evaluates the long-term reliability of the device based on the detected resistive leakage current change pattern. A long-term reliability evaluation system that includes. The method of claim 1,
The long-term reliability evaluation system, characterized in that the deterioration composition device creates a high-temperature environment required by international test standards. According to claim 1, wherein the reliability data detection device,
an operation unit for allowing a system operator to select at least one of a type and a magnitude of a maximum continuous operating voltage (MCOV) to be applied to the arrester element;
a voltage supply unit for generating a maximum continuous operation voltage (MCOV) selected through the manipulation unit and applying the generated maximum continuous operation voltage (MCOV) to the arrester element; and
and a leakage current detection unit that measures the total current leaking from the lightning arrester element using an ammeter when the maximum continuous operating voltage (MCOV) is applied. According to claim 1, wherein the reliability analysis device,
a data collection unit configured to collect data on a voltage applied from the reliability data detection device to the lightning arrester element and data on a current leaking from the lightning arrester element;
a resistive leakage current detection unit configured to detect a resistive leakage current of the lightning arrester element based on the voltage and current data stored in the data collection unit; and
and a reliability evaluation unit that detects a resistive leakage current change pattern of the lightning arrester element over time and evaluates the long-term reliability of the corresponding element based on the detected resistive leakage current change pattern. 5. The method of claim 4, wherein the resistive leakage current detection unit,
A long-term reliability evaluation system, characterized in that the resistive leakage current of the arrester element is detected by using at least one of a Watt Loss measurement method, a Median measurement method, an in-phase measurement method, and a DC measurement method. According to claim 4, The reliability analysis device,
Further comprising a user input unit for receiving a user input related to the long-term reliability evaluation of the lightning arrester element,
The long-term reliability evaluation system, wherein the user input includes a user input for setting a deterioration environment condition and a user input for setting a long-term reliability evaluation time.

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