CN116794437A - Lightning arrester degradation judgment method, device, electronic equipment and storage medium - Google Patents
Lightning arrester degradation judgment method, device, electronic equipment and storage medium Download PDFInfo
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Abstract
The application discloses a lightning arrester degradation judgment method, a lightning arrester degradation judgment device, electronic equipment and a storage medium. The method specifically comprises the following steps: acquiring the total energy absorbed by lightning stroke of a target lightning arrester, voltage level, injected coulomb quantity of a transferred charge test and unit energy of an action load test; determining a degradation energy threshold of the target lightning arrester according to the voltage level, the injected coulomb quantity and the unit energy; and judging the degradation state of the target lightning arrester according to the total energy absorbed by the lightning stroke and the degradation energy threshold value. The embodiment of the application provides a feasible criterion for the degradation of the lightning arrester, and improves the recognition accuracy and efficiency of the degradation; before serious damage occurs to the lightning arrester, the lightning arrester is subjected to degradation judgment, so that timeliness of degradation identification is improved, maintenance of the lightning arrester by related personnel is facilitated, and timely treatment is performed to prevent the lightning arrester from developing into a thermal breakdown fault.
Description
Technical Field
The present application relates to the field of lightning protection devices, and in particular, to a method and apparatus for determining degradation of a lightning arrester, an electronic device, and a storage medium.
Background
Along with the great development of urban construction engineering and the continuous promotion of urban process, the expansion of more and more buildings and power systems gradually increases the application quantity of lightning arresters. The mechanism of damage to such equipment is typically that thermal breakdown due to abnormal heat generation causes deterioration of the arrester, most of which is a phenomenon of deterioration with the increase of the operating time.
Currently, aiming at slow degradation caused by long-time operation of the lightning arrester, related technicians acquire information of the slow degradation of the lightning arrester according to preventive tests and other means, and judge whether the lightning arrester has serious problems according to the severity degree reflected by the degradation information. However, in actual situations, repeated lightning strike phenomenon occurs in lightning, so that the lightning arrester is rapidly degraded, and rapid degradation of the lightning arrester cannot be determined timely, accurately and efficiently by means of preventive tests and the like.
Disclosure of Invention
The application provides a lightning arrester degradation judgment method, a device, electronic equipment and a storage medium, which are used for improving the judgment timeliness, accuracy and efficiency of rapid degradation of a lightning arrester under the condition of repeated lightning strokes.
According to an aspect of the present application, there is provided a lightning arrester degradation determination method including:
acquiring the total energy absorbed by lightning stroke of a target lightning arrester, voltage level, injected coulomb quantity of a transferred charge test and unit energy of an action load test;
determining a degradation energy threshold of the target lightning arrester according to the voltage level, the injected coulomb quantity and the unit energy;
and judging the degradation state of the target lightning arrester according to the total energy absorbed by the lightning stroke and the degradation energy threshold value.
According to another aspect of the present application, there is provided an arrester degradation determination device including:
the data acquisition module is used for acquiring the total energy absorbed by lightning stroke of the target lightning arrester, the voltage level, the injected coulomb quantity of the transferred charge test and the unit energy of the action load test;
the threshold determining module is used for determining a degradation energy threshold of the target lightning arrester according to the voltage level, the injected coulomb quantity and the unit energy;
and the degradation judgment module is used for judging the degradation state of the target lightning arrester according to the total energy absorbed by the lightning stroke and the degradation energy threshold value.
According to another aspect of the present application, there is provided an electronic apparatus including:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein,,
the memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the lightning arrester degradation determination method according to any of the embodiments of the present application.
According to another aspect of the present application, there is provided a computer-readable storage medium storing computer instructions for causing a processor to implement the lightning arrester degradation determination method according to any of the embodiments of the present application when executed.
According to the technical scheme of the embodiment of the application, the degradation energy threshold value is determined according to the voltage level, the injected coulomb quantity and the unit energy of the lightning arrester, and the energy absorbed by the lightning arrester is judged through the degradation energy threshold value so as to determine the degradation condition of the lightning arrester. The embodiment of the application provides a feasible criterion for the degradation of the lightning arrester, and improves the recognition accuracy and efficiency of the degradation; before serious damage occurs to the lightning arrester, the lightning arrester is subjected to degradation judgment, so that timeliness of degradation identification is improved, maintenance of the lightning arrester by related personnel is facilitated, and timely treatment is performed to prevent the lightning arrester from developing into a thermal breakdown fault.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the application or to delineate the scope of the application. Other features of the present application will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a lightning arrester degradation determination method according to a first embodiment of the present application;
fig. 2A is a flowchart of a method for judging deterioration of a lightning arrester according to a second embodiment of the present application;
fig. 2B is a schematic view of a volt-ampere characteristic curve of a lightning arrester provided according to a second embodiment of the present application;
FIG. 2C is a schematic diagram of a lightning current waveform provided according to a second embodiment of the application;
FIG. 2D is a schematic illustration of a repeated lightning strike provided in accordance with a second embodiment of the application;
fig. 3 is a schematic structural view of a lightning arrester degradation judgment device according to a third embodiment of the present application;
fig. 4 is a schematic structural diagram of an electronic device implementing a lightning arrester degradation determination method according to an embodiment of the present application.
Detailed Description
In order that those skilled in the art will better understand the present application, a technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the application described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1
Fig. 1 is a flowchart of a method for determining degradation of a lightning arrester according to an embodiment of the present application, where the method may be performed by a device for determining degradation of a lightning arrester, and the device may be implemented in hardware and/or software, and the device may be configured in an electronic device. As shown in fig. 1, the method includes:
s110, acquiring the total energy absorbed by lightning stroke of the target lightning arrester, the voltage level, the injected coulomb quantity of the transferred charge test and the unit energy of the action load test.
The target lightning arrester can be any lightning protection device needing degradation judgment. The total energy absorbed by a lightning strike may be the total energy that the arrester is subjected to by conducting the lightning over multiple repeated lightning strikes. For multiple repeated lightning strikes, generally, at least two lightning strikes within 100ms of each other are referred to as repeated lightning strikes. Since repeated lightning strokes easily cause rapid deterioration of the lightning arrester, embodiments of the present application will be described with respect to judgment of rapid deterioration.
The voltage level may be a voltage level set in the production specification of the target lightning arrester, for example, 110kv, 220kv, 500kv, or the like.
The transferred charge test may be a test for verifying the ability of the arrester to transfer charge in actual operation, may be performed based on repeated transfer of charge injection energy by the resistive sheet, and one transferred charge test may represent one high current impact event in actual operation. The injected coulomb quantity may be the amount of charge injected into the target arrester (e.g., resistive sheet) in a transferred charge experiment to test whether the target arrester may be used to determine a criteria for rapid degradation and further to test the target arrester's ability to withstand the energy of a lightning strike.
The action load test can be used for verifying whether the lightning arrester can keep thermal stability (for example, whether the heating condition is smaller than heat dissipation) and cannot be thermally collapsed after the last energy is injected in the actual operation of the lightning arrester, and then the lightning arrester is operated under short-time overvoltage and continuous voltage. The transferred charge test is also used to test whether the target arrester can be used to determine criteria for rapid degradation, thereby further testing the target arrester's ability to withstand lightning strike energy. The action load test may be based on the action load of the arrester thermal proportioning unit for energy calculation. The unit energy of the action load test can be an inherent property of the target arrester and is used for representing the energy (kilojoules) correspondingly loaded per kilovolt. It will be appreciated that the unit energy corresponding to different gauges of arresters (e.g., arresters of different voltage classes) is different. For example, the unit energy is proportional to the voltage class of the arrester.
The voltage level, the injected coulomb quantity and the unit energy can be directly obtained through a pre-test or a nameplate of the target lightning arrester, the total energy absorbed by the lightning stroke can be obtained through a sensor arranged on the target lightning arrester, for example, the current and the voltage during repeated lightning stroke are obtained, and the total energy absorbed by the lightning stroke is determined according to the integral of the product of the current and the voltage in time. The embodiment of the application does not limit the acquisition mode of the total energy absorbed by lightning stroke.
S120, determining a degradation energy threshold value of the target lightning arrester according to the voltage level, the injected coulomb quantity and the unit energy.
The degradation energy threshold may be a maximum value that the target arrester can carry lightning strike energy, characterizing the target arrester's ability to withstand lightning strikes. It will be appreciated that the lightning arresters of different voltage classes have different withstand capabilities to a lightning strike, and in general the withstand capability to a lightning strike is proportional to the voltage class of the target lightning arrestor. A machine learning model may be trained in advance, the model input being the voltage level, injected coulomb quantity and unit energy of the target arrester, the model outputting the degradation energy threshold of the target arrester. The machine learning model may be trained with a large amount of actual data, which is not limited in this embodiment of the application.
S130, judging the degradation state of the target lightning arrester according to the total energy absorbed by the lightning stroke and the degradation energy threshold value.
And comparing the total energy absorbed after repeated lightning strokes with the degradation energy threshold value, and further judging whether the target lightning arrester is degraded or not.
In an alternative embodiment, the determining the degradation state of the target lightning arrester according to the total energy absorbed by the lightning strike and the degradation energy threshold may include: if the total energy absorbed by the lightning strike is greater than the degradation energy threshold, the target arrester is rapidly degraded.
It will be appreciated that for repeated lightning strike situations, rapid degradation of the target arrester occurs when the total energy absorbed by the lightning strike exceeds the limit of the lightning strike energy that the target arrester can withstand.
According to the technical scheme of the embodiment of the application, the degradation energy threshold value is determined according to the voltage level, the injected coulomb quantity and the unit energy of the lightning arrester, and the energy absorbed by the lightning arrester is judged through the degradation energy threshold value so as to determine the degradation condition of the lightning arrester. The embodiment of the application provides a feasible criterion for the degradation of the lightning arrester, and improves the recognition accuracy and efficiency of the degradation; before serious damage occurs to the lightning arrester, the lightning arrester is subjected to degradation judgment, so that timeliness of degradation identification is improved, maintenance of the lightning arrester by related personnel is facilitated, and timely treatment is performed to prevent the lightning arrester from developing into a thermal breakdown fault.
Example two
Fig. 2A is a flowchart of a method for determining degradation of a lightning arrester according to a second embodiment of the present application, where the determining operation of the degradation energy threshold is further refined based on the foregoing embodiment. As shown in fig. 2A, the method includes:
s210, acquiring the total energy absorbed by lightning stroke of the target lightning arrester, the voltage level, the injected coulomb quantity of the transferred charge test and the unit energy of the action load test.
S220, determining the first through-current capacity of the target lightning arrester according to the voltage grade and the injected coulomb quantity.
The through-current capacity is an important index for measuring the anti-surge capability of the surge protector (i.e. the lightning arrester), and the maximum through-current capacity refers to the Energy which can be absorbed by the lightning arrester without damage, and is called the maximum sustainable Energy (Energy Withstand). If the energy dissipated thereon exceeds this threshold, the lightning protection device will be damaged. The first through-current capacity may be a through-current capacity of the target arrester determined from a transferred charge test. Through a transferred charge test, the corresponding relation between the injected coulomb quantity and the first through-current capacity of the lightning arresters with different voltage levels can be determined, so that the first through-current capacity of the target lightning arresters is determined.
In an alternative embodiment, before the acquiring the total energy absorbed by the lightning strike of the target lightning arrester, the voltage class, the injected coulomb quantity of the transferred charge test, and the unit energy of the action load test, the method may include: carrying out a charge transfer test on the target lightning arrester; determining a first corresponding relation between the injected coulomb quantity, the square wave amplitude value and the injected energy of the lightning arrester according to a transferred charge test; accordingly, determining the first current capacity of the target arrester based on the voltage class and the injected coulomb quantity may include: and determining the first through-flow capacity according to the voltage level, the injected coulomb quantity and the first corresponding relation.
The first correspondence may be a correspondence determined by a transferred charge test between the injected coulomb quantity and the square wave amplitude value, and the injected energy, and the lightning arresters of different voltage levels have different first correspondence.
The procedure for the transferred charge test was as follows: for the station lightning arrester, a square wave of 2-4ms (or a sine half wave of 2-4 ms) is selected, a resistor disc is used as a test sample, each test sample is resistant to 20 times of impact, the test sample is divided into 10 groups of 2 times, the interval time of 2 times of impact is 50-60 s, and the test sample is cooled to the ambient temperature between 2 groups.
The repeated transfer charge test criteria for the lightning arresters of different voltage classes is the coulomb quantity injected per impact test, converted to a 2ms square wave current amplitude and single injection energy as shown in table 1.
For a typical 500kV lightning arrester, the injected coulomb quantity is 3.96C, the amplitude of a square wave of 2ms is converted into 1980A, after the residual voltage value U of a square wave test is obtained according to the volt-ampere characteristic, the injection energy value of Shan Cifang waves is calculated to be 3.96U, taking a Y20W-444/1050 type 500kV line side lightning arrester as an example, the injection energy of 3.45MJ in a single impact process is calculated to be 870kV according to the volt-ampere characteristic provided by a manufacturing plant and the residual voltage U under 1980A (about 2 kA).
TABLE 1 relationship between injected coulomb quantity and 2ms square wave current amplitude and injection energy
If the test result meets all the following conditions, determining that the test is qualified, and calculating the first through-flow capacity:
(a) No mechanical damage marks (breakdown, flashover or cracking);
(b) The direct current and power frequency reference voltage changes by less than +/-5% before and after the test;
(c) Residual voltage changes under nominal discharge current before and after the test are not more than +/-5%;
(d) Impact test was performed once at 8/20. Mu.s with 2 times nominal discharge current without mechanical damage.
Taking a 500kV lightning arrester as an example, the calculation of the first through-current capacity considers that the interval time between two square waves is short, and from the aspect of energy injection, the energy absorption capacity of a typical Y20W-444/1050 type 500kV line side lightning arrester is 7.92 multiplied by 870 kV=6.89 MJ based on the sum of the energy of two square wave tests.
And S230, determining the second current capacity of the target lightning arrester according to the voltage grade and the unit energy.
The second current capacity may be a current capacity of the target lightning arrester determined by an operation load test, in the same manner as the first current capacity. Through an action load test, the corresponding relation between the unit energy and the second through-flow capacity of the lightning arresters with different voltage levels can be determined, so that the second through-flow capacity of the target lightning arresters is determined.
In an alternative embodiment, before the acquiring the total energy absorbed by the lightning strike of the target lightning arrester, the voltage class, the injected coulomb quantity of the transferred charge test, and the unit energy of the action load test, the method may include: performing an action load test on the target lightning arrester; determining a second corresponding relation between unit energy and lightning arrester injection energy according to the action load test; accordingly, determining the second current capacity of the target lightning arrester according to the voltage class and the unit energy may include: and determining the second through-flow capacity according to the voltage level, the unit energy and the second corresponding relation.
The action load test can comprise a preliminary test, a thermal stability test and a short-time power frequency overvoltage and continuous operation voltage test.
The preliminary test includes performing a large current surge test of 100kA in magnitude of 4/10. Mu.s on the resistor sheet of the target lightning arrester 2 times, and cooling the resistor sheet to room temperature between 2 surges.
The thermal stability test includes a thermal proportioning unit for the target lightning arrester, and the energy is injected by using 2-4ms square wave (or 2-4ms sine wave) in three minutes, so that the impact frequency is not limited.
The test of applying short-time power frequency overvoltage and continuous operation voltage can be that after injecting energy, applying rated voltage for 10s to the target lightning arrester within the time of not more than 100ms, then applying continuous operation voltage for at least 30 minutes, detecting current resistive component or power loss or temperature of the target lightning arrester until the measured value is obviously reduced, and judging that the lightning arrester is thermally stable; if the measured value continues to increase, it is determined as thermal breakdown.
If the result of the operation load test satisfies all the following conditions, the test is determined to be qualified, and the calculation of the second through-flow capacity can be performed:
(a) Thermal stability is not destroyed;
(b) Residual voltage changes under nominal discharge current before and after the test are not more than +/-5%;
(c) No significant mechanical damage was observed before and after the test.
The impact energy of the lightning arresters with different voltage classes is shown in table 2, and by taking a Y20W-444/1050 type 500kV line side lightning arrester as an example, the total injection energy of the operation load test pair which is calculated to be the whole lightning arrester is 6.21MJ, and the total injection energy is equivalent to the sum of the energy of two square wave tests in the repeated charge transfer test (6.89 MJ).
TABLE 2 relationship between unit energy and injection energy for action load test
According to table 2, taking a 500kV arrester as an example, the calculation of the second through-current capacity may be rounded to about 6.2MJ.
According to the two embodiments, the first through-flow capacity and the second through-flow capacity are respectively determined through the charge transfer test and the action load test, the lightning stroke bearing capacity of the target lightning arrester is determined from different angles, a basis is provided for the subsequent determination of the degradation energy threshold value of the target lightning arrester and the rapid degradation judgment of the target lightning arrester, and the accuracy of the degradation judgment is further improved.
S240, determining a degradation energy threshold value of the target lightning arrester according to the first through-flow capacity and the second through-flow capacity.
The first and second through-flow capacities were determined by the aforementioned transferred charge test and action load test. The determination of the degradation energy threshold is performed by a combination of the first and second through-flow capacities, for example, a pre-trained machine learning model may be employed, which inputs the first and second through-flow capacities, which outputs the degradation energy threshold of the target arrester.
In an alternative embodiment, the determining the degradation energy threshold of the target lightning arrester according to the first through-current capacity and the second through-current capacity may include: determining a reference current capacity of the target lightning arrester according to the first current capacity and the second current capacity; and determining a degradation energy threshold according to the reference through-flow capacity and a preset safety margin coefficient.
The reference flow capacity may be a reference value of flow capacity for calculating the degradation energy threshold, and is determined by the first flow capacity and the second flow capacity. In practice, both the first through-flow capacity and the second through-flow capacity may be directly used as the reference through-flow capacity, or the smaller one may be further selected as the reference through-flow capacity or averaged to be used as the reference through-flow capacity.
The safety margin coefficient may be a coefficient relating to a relationship between the defined reference flow-through capacity and the degradation energy threshold, the safety margin coefficient being less than 1. The safety margin coefficient may be determined by a related technician according to actual conditions, a lot of experiments, or manual experience, and may be set to 0.25, for example, which is not limited in the embodiment of the present application.
For example, the deterioration of the lightning arrester or the resistor sheet means that the current flowing increases and the heat generation increases under the same voltage, and the current-voltage characteristic is represented as a downward current-voltage characteristic, as shown in fig. 2B.
The main component of the lightning arrester resistor disc is metal oxide (or called zinc oxide), the resistor of the lightning arrester resistor disc has negative temperature characteristics, manufacturers generally have experimental data of the corresponding relation between the temperature of the resistor disc and a volt-ampere characteristic curve (mainly reflected in reference voltage), and as shown in table 3, the decreasing change rate of the direct current 1mA reference voltage is increased when the temperature of the resistor disc exceeds 60 ℃ and the degradation trend occurs; near 100 c the reference voltage will drop by more than 8% and the degradation characteristics are more pronounced.
TABLE 3 relation of reference voltage of certain 500kV arrester resistor disc with temperature rise
Therefore, the logic chain of the arrester failure should be absorption energy-the temperature rise-volt-ampere characteristic of the resistor sheet shifts down-the degradation of the resistor sheet, and from the energy absorption perspective, the absorption energy threshold at which the resistor sheet tends to undergo accelerated degradation should be determined based on the through-flow capacity of the resistor sheet.
In recent years, the thermal breakdown fault of the lightning arrester, which is highly related to the repeated lightning strike process in time, has the following characteristics that the fault causes are lightning invasion waves of the line caused by the repeated lightning strike of the line, main discharge (first strike back) or preface strike back cause insulator breakdown and stable arc establishment, the line side circuit breaker cuts off the line, the line side lightning arrester absorbs the lightning invasion wave energy of the repeated lightning strike process in a short time to quickly deteriorate, and the lightning arrester accelerates to deteriorate and generate the thermal breakdown fault under the system operating voltage within a short time after the lightning process is finished and the line recloses.
Considering that the types of the lightning arrester resistor sheets are more, the resistor sheet performances of different manufacturers are different, it is difficult to establish a quantitative relation between the accumulated absorbed energy of the lightning arrester and the rapid degradation of the resistor sheet in a short time in the repeated lightning strike process through experiments at present, instead of generality, 7 lightning arrester faults are caused by representative repeated lightning strikes with complete lightning information (shown in table 4), a power transmission line and lightning invasion wave simulation model is established by using PSCAD/EMTDC simulation software, lei Jishu, time intervals, current waveforms and the like which are included in one repeated lightning strike process during the fault period are obtained according to the inquiry of a lightning positioning system, the accumulated absorbed energy of the fault lightning arrester in the whole repeated lightning strike process is calculated, the energy level of the rapid degradation of the lightning arrester is known, and accordingly the energy absorption threshold of the rapid degradation of the lightning arrester is determined.
The lightning current waveform is a non-periodic transient pulse wave that generally rises to a peak value quickly and then slowly falls to zero, generally denoted as T1/T2 μs, T1 is the wave head time, and T2 is the half-peak time, as shown in FIG. 2C.
Thunderclouds typically have multiple charge centers, so lightning ground flash is a repeated strike process consisting of a main discharge (first strike back) and a subsequent multiple strike back at very short intervals. The conductivity of the main discharge channel is very high, the subsequent back striking time interval is very short (in the order of 100 ms), and the main discharge channel is not free, so that a continuous current process is usually carried out between two back striking, and hundreds of A-level currents exist in the discharge channel; because other charge centers easily share the discharge channel, the subsequent back striking discharge process is smoother, the discharge development process is shorter, and the corresponding wave head time and half-peak time are shorter than those of the first back striking.
The repeated lightning stroke process is shown in fig. 2D, the lightning current of the first strike back is selected to be 1/200 mu s pulse waveform, and the Heidler function (lightning current function) is adopted for simulation; selecting a pulse waveform of 0.30/30 mu s after the subsequent back striking, and simulating by adopting a composite function; the time interval between the two shots is about 100ms, and the half peak is set according to the waveform actually measured, and the continuous current between the two pulses is slowly reduced to 500A after about 1 ms.
TABLE 4 repeated lightning strike process current parameters for fault cases
It should be noted that the lightning shielding failure levels of 110kV, 220kV and 500kV lines are 7kA, 14kA and 23kA, respectively, and that a lightning current that is too large will cause an insulator to flashover, and that a lightning current is mostly passed through the tower to ground, and that only a small portion forms an invasive wave along the wire, and that the voltage amplitude of the invasive wave that is caused is rather small, and that, for example, case 2, there are 6 lightning current amplitudes that exceed the 500kV line shielding failure level, and only 4 lightning current amplitudes are below the shielding failure level, and that the lightning current propagates the invasive along the wire to both ends.
The calculation results of the cumulative absorbed energy of the lightning arrester in the fault case during repeated lightning strike are shown in table 5, and it can be seen that:
(1) The total energy accumulated and absorbed by a 500kV line-side arrester in a short time (1 s) in the continuous lightning stroke process before the fault occurs is generally more than 25% of the through-current capacity.
(2) For severe situations where the number of shots is high, or the effective shot current is high (near but not up to the lightning-proof level of the line insulator), the absorbed energy can be up to 50% and the risk of accelerated deterioration of the arrester is high.
Table 5 lightning arrester for fault case lightning strike absorption energy results during repeated lightning strike
Therefore, considering the aging factor of the lightning arrester after operation, in order to enable a higher safety margin, the preset safety margin coefficient k is taken to be 0.25, and the degradation energy threshold of the target lightning arrester can be obtained by multiplying the reference current capacity determined in the previous step by the coefficient k.
Further optionally, the determining the reference current capacity of the target lightning arrester according to the first current capacity and the second current capacity may include: the smaller value of the first through-flow capacity and the second through-flow capacity is taken as the reference through-flow capacity.
After the two tests, the second through-flow capacity obtained based on the action load test and the sum of the energy of the two square wave tests in the transferred charge test (the first through-flow capacity) are relatively close. Then the smaller value (e.g. the smallest value) of the first and second through-flow capacities may be selected as the reference through-flow capacity in order to obtain a higher arrester safety margin.
S250, judging the degradation state of the target lightning arrester according to the total energy absorbed by the lightning stroke and the degradation energy threshold value.
According to the technical scheme provided by the embodiment of the application, under the voltage level of the target lightning arrester, the first through-flow capacity and the second through-flow capacity are respectively determined according to the injected coulomb quantity and the unit energy, so that a basis is provided for the subsequent determination of the degradation energy threshold value, the degradation energy threshold values determined under the two through-flow capacities are provided with accuracy and safety margin, and an accurate and high-safety criterion is provided for the degradation judgment of the lightning arrester.
Example III
Fig. 3 is a schematic structural diagram of a lightning arrester degradation determination device according to a third embodiment of the present application. As shown in fig. 3, the apparatus 300 includes:
a data acquisition module 310, configured to acquire total energy absorbed by a lightning strike of a target lightning arrester, a voltage level, an injected coulomb quantity of a transferred charge test, and unit energy of an action load test;
a threshold determining module 320, configured to determine a degradation energy threshold of the target lightning arrester according to the voltage level, the injected coulomb quantity and the unit energy;
the degradation judgment module 330 is configured to judge a degradation state of the target lightning arrester according to the total energy absorbed by the lightning strike and the degradation energy threshold.
According to the technical scheme of the embodiment of the application, the degradation energy threshold value is determined according to the voltage level, the injected coulomb quantity and the unit energy of the lightning arrester, and the energy absorbed by the lightning arrester is judged through the degradation energy threshold value so as to determine the degradation condition of the lightning arrester. The embodiment of the application provides a feasible criterion for the degradation of the lightning arrester, and improves the recognition accuracy and efficiency of the degradation; before serious damage occurs to the lightning arrester, the lightning arrester is subjected to degradation judgment, so that timeliness of degradation identification is improved, maintenance of the lightning arrester by related personnel is facilitated, and timely treatment is performed to prevent the lightning arrester from developing into a thermal breakdown fault.
In an alternative embodiment, the threshold determination module 320 may include:
a first through-current capacity determining unit for determining a first through-current capacity of the target lightning arrester according to the voltage class and the injected coulomb quantity;
the second through-flow capacity determining unit is used for determining the second through-flow capacity of the target lightning arrester according to the voltage grade and the unit energy;
and the degradation threshold determining unit is used for determining the degradation energy threshold of the target lightning arrester according to the first through-flow capacity and the second through-flow capacity.
In an alternative embodiment, the degradation threshold determining unit may include:
the reference through-flow capacity determining subunit is used for determining the reference through-flow capacity of the target lightning arrester according to the first through-flow capacity and the second through-flow capacity;
and the degradation energy threshold determining subunit is used for determining the degradation energy threshold according to the reference through-flow capacity and a preset safety margin coefficient.
In an alternative embodiment, the reference through-flow capacity determination subunit may be specifically configured to:
the smaller value of the first through-flow capacity and the second through-flow capacity is taken as the reference through-flow capacity.
In an alternative embodiment, the apparatus 300 includes:
the charge transfer test module is used for carrying out charge transfer test on the target lightning arrester;
the first relation determining module is used for determining a first corresponding relation between the injected coulomb quantity, the square wave amplitude value and the injected energy of the lightning arrester according to a transferred charge test;
accordingly, the first through-flow capacity determining unit may be specifically configured to:
and determining the first through-flow capacity according to the voltage level, the injected coulomb quantity and the first corresponding relation.
In an alternative embodiment, the apparatus 300 includes:
the action load test module is used for carrying out action load test on the target lightning arrester;
the second relation determining module is used for determining a second corresponding relation between unit energy and lightning arrester injection energy according to an action load test;
accordingly, the second flow capacity determination unit may be specifically configured to:
and determining the second through-flow capacity according to the voltage level, the unit energy and the second corresponding relation.
In an alternative embodiment, the degradation determination module 330 may be specifically configured to:
if the total energy absorbed by the lightning strike is greater than the degradation energy threshold, the target arrester is rapidly degraded.
The lightning arrester degradation judgment device provided by the embodiment of the application can execute the lightning arrester degradation judgment method provided by any embodiment of the application, and has the corresponding functional modules and beneficial effects of executing the lightning arrester degradation judgment methods.
Example IV
Fig. 4 shows a schematic diagram of the structure of an electronic device 10 that may be used to implement an embodiment of the application. Electronic devices are intended to represent various forms of digital computers, such as laptops, desktops, workstations, personal digital assistants, servers, blade servers, mainframes, and other appropriate computers. Electronic equipment may also represent various forms of mobile devices, such as personal digital processing, cellular telephones, smartphones, wearable devices (e.g., helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions, are meant to be exemplary only, and are not meant to limit implementations of the applications described and/or claimed herein.
As shown in fig. 4, the electronic device 10 includes at least one processor 11, and a memory, such as a Read Only Memory (ROM) 12, a Random Access Memory (RAM) 13, etc., communicatively connected to the at least one processor 11, in which the memory stores a computer program executable by the at least one processor, and the processor 11 may perform various appropriate actions and processes according to the computer program stored in the Read Only Memory (ROM) 12 or the computer program loaded from the storage unit 18 into the Random Access Memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the electronic device 10 may also be stored. The processor 11, the ROM 12 and the RAM 13 are connected to each other via a bus 14. An input/output (I/O) interface 15 is also connected to bus 14.
Various components in the electronic device 10 are connected to the I/O interface 15, including: an input unit 16 such as a keyboard, a mouse, etc.; an output unit 17 such as various types of displays, speakers, and the like; a storage unit 18 such as a magnetic disk, an optical disk, or the like; and a communication unit 19 such as a network card, modem, wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information/data with other devices via a computer network, such as the internet, and/or various telecommunication networks.
The processor 11 may be a variety of general and/or special purpose processing components having processing and computing capabilities. Some examples of processor 11 include, but are not limited to, a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), various specialized Artificial Intelligence (AI) computing chips, various processors running machine learning model algorithms, digital Signal Processors (DSPs), and any suitable processor, controller, microcontroller, etc. The processor 11 performs the respective methods and processes described above, such as the arrester degradation determination method.
In some embodiments, the arrester degradation determination method may be implemented as a computer program, which is tangibly embodied on a computer-readable storage medium, such as the storage unit 18. In some embodiments, part or all of the computer program may be loaded and/or installed onto the electronic device 10 via the ROM 12 and/or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the lightning arrester deterioration judgment method described above may be performed. Alternatively, in other embodiments, the processor 11 may be configured to perform the arrester degradation determination method in any other suitable way (e.g., by means of firmware).
Various implementations of the systems and techniques described here above may be implemented in digital electronic circuitry, integrated circuit systems, field Programmable Gate Arrays (FPGAs), application Specific Integrated Circuits (ASICs), application Specific Standard Products (ASSPs), systems On Chip (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and/or combinations thereof. These various embodiments may include: implemented in one or more computer programs, the one or more computer programs may be executed and/or interpreted on a programmable system including at least one programmable processor, which may be a special purpose or general-purpose programmable processor, that may receive data and instructions from, and transmit data and instructions to, a storage system, at least one input device, and at least one output device.
A computer program for carrying out methods of the present application may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the computer programs, when executed by the processor, cause the functions/acts specified in the flowchart and/or block diagram block or blocks to be implemented. The computer program may execute entirely on the machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
In the context of the present application, a computer-readable storage medium may be a tangible medium that can contain, or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. The computer readable storage medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. Alternatively, the computer readable storage medium may be a machine readable signal medium. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
To provide for interaction with a user, the systems and techniques described here can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to a user; and a keyboard and a pointing device (e.g., a mouse or a trackball) through which a user can provide input to the electronic device. Other kinds of devices may also be used to provide for interaction with a user; for example, feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form, including acoustic input, speech input, or tactile input.
The systems and techniques described here can be implemented in a computing system that includes a background component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front-end component (e.g., a user computer having a graphical user interface or a web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such background, middleware, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: local Area Networks (LANs), wide Area Networks (WANs), blockchain networks, and the internet.
The computing system may include clients and servers. The client and server are typically remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. The server can be a cloud server, also called a cloud computing server or a cloud host, and is a host product in a cloud computing service system, so that the defects of high management difficulty and weak service expansibility in the traditional physical hosts and VPS service are overcome.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present application may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present application are achieved, and the present application is not limited herein.
The above embodiments do not limit the scope of the present application. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the scope of the present application.
Claims (10)
1. A method for judging deterioration of a lightning arrester, the method comprising:
acquiring the total energy absorbed by lightning stroke of a target lightning arrester, voltage level, injected coulomb quantity of a transferred charge test and unit energy of an action load test;
determining a degradation energy threshold of the target arrester based on the voltage class, the injected coulomb quantity, and the unit energy;
and judging the degradation state of the target lightning arrester according to the total energy absorbed by the lightning stroke and the degradation energy threshold value.
2. The method of claim 1, wherein the determining the degradation energy threshold of the target arrester from the voltage level, the injected coulomb quantity, and the unit energy comprises:
determining a first through-current capacity of the target arrester according to the voltage class and the injected coulomb quantity;
determining a second current capacity of the target lightning arrester according to the voltage class and the unit energy;
and determining a degradation energy threshold value of the target lightning arrester according to the first through-flow capacity and the second through-flow capacity.
3. The method of claim 1, wherein the determining the degradation energy threshold of the target arrester based on the first and second through-flow capacities comprises:
determining a reference current capacity of the target lightning arrester according to the first current capacity and the second current capacity;
and determining the degradation energy threshold according to the reference through-flow capacity and a preset safety margin coefficient.
4. A method according to claim 3, wherein said determining a reference current capacity of the target arrester based on the first current capacity and the second current capacity comprises:
and taking the smaller value of the first through-flow capacity and the second through-flow capacity as the reference through-flow capacity.
5. The method of claim 2, wherein prior to the acquiring the total energy absorbed by the lightning strike of the target lightning arrester, the voltage class, the injected coulomb quantity of the transferred charge test, and the unit energy of the action load test, the method comprises:
performing the transferred charge test on the target arrester;
determining a first corresponding relation between the injected coulomb quantity, the square wave amplitude value and the injected energy of the lightning arrester according to the transferred charge test;
correspondingly, the determining the first current capacity of the target lightning arrester according to the voltage level and the injected coulomb quantity comprises the following steps:
and determining the first through-flow capacity according to the voltage level, the injected coulomb quantity and the first corresponding relation.
6. The method of claim 2, wherein prior to the acquiring the total energy absorbed by the lightning strike of the target lightning arrester, the voltage class, the injected coulomb quantity of the transferred charge test, and the unit energy of the action load test, the method comprises:
performing the action load test on the target lightning arrester;
determining a second corresponding relation between the unit energy and the lightning arrester injection energy according to the action load test;
correspondingly, the determining the second current capacity of the target lightning arrester according to the voltage grade and the unit energy comprises the following steps:
and determining the second through-flow capacity according to the voltage level, the unit energy and the second corresponding relation.
7. The method of any of claims 1-6, wherein the determining a degradation state of the target arrester based on the total energy absorbed by the lightning strike and the degradation energy threshold comprises:
if the total energy absorbed by the lightning strike is greater than the degradation energy threshold, the target arrester is rapidly degraded.
8. A lightning arrester degradation determination device, characterized by comprising:
the data acquisition module is used for acquiring the total energy absorbed by lightning stroke of the target lightning arrester, the voltage level, the injected coulomb quantity of the transferred charge test and the unit energy of the action load test;
a threshold determining module for determining a degradation energy threshold of the target arrester according to the voltage level, the injected coulomb quantity and the unit energy;
and the degradation judgment module is used for judging the degradation state of the target lightning arrester according to the total energy absorbed by the lightning stroke and the degradation energy threshold value.
9. An electronic device, the electronic device comprising:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein,,
the memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the lightning arrester degradation determination method of any of claims 1-7.
10. A computer-readable storage medium storing computer instructions for causing a processor to execute the lightning arrester degradation determination method according to any one of claims 1 to 7.
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