A method and device for analyzing transferred charge of a lightning arrester and a storage medium

Abstract

The application discloses a lightning arrester transfer charge analysis method and device and a storage medium, wherein the method comprises the following steps: acquiring a lightning current amplitude, and calculating a lightning current frequency domain function according to the lightning current amplitude; calculating a lightning current transfer charge frequency domain function according to the lightning current frequency domain function and a correction coefficient; calculating an amplitude spectrum function of the lightning current transfer charge and an amplitude frequency of the total amount of the lightning current transfer charge when the frequency tends to positive infinity according to the lightning current transfer charge frequency domain function; and taking the ratio of the amplitude spectrum function to the amplitude frequency as the relative transfer charge amplitude spectrum of the lightning current. The application can effectively avoid the analysis error of the lightning current transfer charge by introducing a correction function to adjust the lightning current frequency domain function, thereby effectively improving the accuracy and reliability of the lightning current transfer charge analysis.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lightning arresters, in particular to a lightning arrester transfer charge analysis method, device and storage medium. BACKGROUND

[0002] In the international standard IEC60099-4:2014, the long duration current impulse resistance test is replaced by the repeated charge transfer capacity test, and the energy resistance capacity of the line lightning arrester is examined by the amount of charge passing through the resistance sheet.

[0003] The existing lightning arrester transfer charge analysis method usually directly uses Fourier transform analysis, without adjusting the lightning current frequency domain function, resulting in a large error in the transfer charge analysis result. SUMMARY

[0004] The present application provides a lightning arrester transfer charge analysis method, device and storage medium to solve the technical problem that the existing lightning arrester transfer charge analysis method usually directly uses Fourier transform analysis without adjusting the lightning current frequency domain function, resulting in a large error in the transfer charge analysis result.

[0005] The present application provides a lightning arrester transfer charge analysis method, comprising:

[0006] Obtaining the amplitude of the lightning current, and calculating the lightning current frequency domain function according to the amplitude of the lightning current;

[0007] According to the lightning current frequency domain function and the introduced correction coefficient, the lightning current transfer charge frequency domain function is calculated;

[0008] According to the lightning current transfer charge frequency domain function, the amplitude spectrum function of the lightning current transfer charge and the amplitude frequency of the total amount of lightning current transfer charge when the frequency tends to positive infinity are calculated, and the ratio of the amplitude spectrum function to the amplitude frequency is taken as the relative transfer charge amplitude spectrum of the lightning current.

[0009] Further, the lightning current frequency domain function is calculated according to the amplitude of the lightning current, comprising:

[0010] According to the amplitude of the lightning current, a double exponential lightning current time domain function is constructed, and the Fourier transform of the double exponential lightning current time domain function is obtained to obtain the lightning current frequency domain function.

[0011] Further, the expression of the double exponential lightning current time domain function is as follows:

[0012] i(t)=I0(e -αt -e -βt )

[0013] Wherein, t represents time, a, b is constant, I0 is lightning current amplitude, e is the base of natural logarithm, e = 1 + 1 / 1! + 1 / 2! + 1 / 3! +... + 1 / n! +..., n is a natural number.

[0014] Further, the expression of the lightning current frequency domain function is as follows:

[0015]

[0016] In the formula, I (ω) is the lightning current frequency domain function, ω is the angular frequency, and j is the imaginary unit.

[0017] Further, the lightning current transfer charge frequency domain function is calculated according to the lightning current frequency domain function and the introduced correction coefficient, comprising:

[0018] According to the resistance chip resistance of the lightning arrester, the resistance chip residual voltage of the lightning arrester and the lightning current frequency domain function, the lightning arrester absorption energy spectrum is calculated:

[0019]

[0020] Wherein, W (ω) is the lightning arrester absorption energy spectrum, R is the resistance chip resistance of the lightning arrester, and U is the resistance chip residual voltage of the lightning arrester;

[0021] Based on the lightning arrester absorption energy spectrum and the introduced correction coefficient, the lightning current transfer charge frequency domain function is calculated:

[0022]

[0023] Wherein, Q (ω) is the lightning current transfer charge frequency domain function, and k is the correction coefficient.

[0024] Further, the expression of the lightning current transfer charge amplitude frequency spectrum function is as follows:

[0025]

[0026] Wherein,

[0027]

[0028] |Q (ω)| is the lightning current transfer charge amplitude frequency spectrum function, and A, B are introduced parameters.

[0029] Further, the expression of the lightning current transfer charge total amount amplitude frequency is as follows:

[0030]

[0031] Wherein, |Q (+∞)| is the lightning current transfer charge total amount amplitude frequency.

[0032] Further, after taking the ratio of the amplitude spectrum function to the amplitude frequency as the relative transfer charge amplitude spectrum of lightning current, it further comprises:

[0033] By simulating the relative transfer charge amplitude spectrum, the relative transfer charge amplitude cumulative spectrum curve under different lightning waveform parameters is obtained.

[0034] According to the relative transfer charge amplitude cumulative spectrum curve, the distribution frequency interval of lightning current energy and lightning current amplitude is determined.

[0035] The application also provides a lightning arrester transfer charge analysis device, comprising:

[0036] A lightning current frequency domain function calculation module is configured to obtain a lightning current amplitude and calculate a lightning current frequency domain function according to the lightning current amplitude.

[0037] A transfer charge frequency domain function calculation module is configured to calculate a lightning current transfer charge frequency domain function according to the lightning current frequency domain function and an introduced correction coefficient.

[0038] A relative transfer charge amplitude spectrum determination module is configured to calculate an amplitude spectrum function of lightning current transfer charge and an amplitude frequency of the total amount of lightning current transfer charge when the frequency tends to positive infinity according to the lightning current transfer charge frequency domain function, and take the ratio of the amplitude spectrum function to the amplitude frequency as the relative transfer charge amplitude spectrum of lightning current.

[0039] Further, the lightning current frequency domain function calculation module is further configured to:

[0040] A double exponential lightning current time domain function is constructed according to the lightning current amplitude, and a lightning current frequency domain function is obtained by performing Fourier transformation on the double exponential lightning current time domain function.

[0041] In an embodiment, the expression of the double exponential lightning current time domain function is as follows:

[0042] i(t)=I0(e -αt -e -βt )

[0043] Wherein, t represents time, α and β are constants, I0 is the lightning current amplitude, e is the base of natural logarithm, e=1+1 / 1!+1 / 2!+1 / 3!+...+1 / n!+..., and n is a natural number.

[0044] Further, the expression of the lightning current frequency domain function is as follows:

[0045]

[0046] In the formula, I (ω) is a lightning current frequency domain function, ω is an angular frequency, and j is an imaginary unit.

[0047] Further, the transferred charge frequency domain function calculation module is further used to:

[0048] According to the arrester resistance, the arrester residual voltage, and the lightning current frequency domain function, the arrester absorbed energy spectrum is calculated:

[0049]

[0050] In the formula, W (ω) is the arrester absorbed energy spectrum, R is the arrester resistance, and U is the arrester residual voltage.

[0051] Based on the arrester absorbed energy spectrum and the introduced correction coefficient, the lightning current transferred charge frequency domain function is calculated:

[0052]

[0053] In the formula, Q (ω) is the lightning current transferred charge frequency domain function, and k is the correction coefficient.

[0054] Further, the expression of the amplitude frequency spectrum function of the lightning current transferred charge is as follows:

[0055] In the formula,

[0056]

[0057]

[0058] |Q (ω)| is the amplitude frequency spectrum function of the lightning current transferred charge, and A and B are introduced parameters.

[0059] Further, the expression of the amplitude frequency of the total amount of the lightning current transferred charge is as follows:

[0060]

[0061] In the formula, |Q (+∞)| is the amplitude frequency of the total amount of the lightning current transferred charge.

[0062] Further, the arrester transferred charge analysis device further comprises:

[0063] The cumulative spectrum curve determination module is used to obtain the relative transferred charge amplitude cumulative spectrum curve under different lightning waveform parameters by simulating the relative transferred charge amplitude spectrum.

[0064] The lightning current analysis module is further used to determine the distribution frequency interval of the lightning current energy and the lightning current amplitude according to the relative transferred charge amplitude cumulative spectrum curve.

[0065] The application further provides a computer readable storage medium, which comprises a stored computer program; wherein the computer readable storage medium controls a device where the computer readable storage medium is located to execute the arrester transferred charge analysis method as above when the computer program runs.

[0066] The application can effectively avoid the error of the transferred charge analysis of the lightning current by adjusting the lightning current frequency domain function by introducing the correction function, thereby effectively improving the accuracy and reliability of the transferred charge analysis of the lightning current.

[0067] Further, the application can accurately fit the actually observed lightning current waveform by constructing the double exponential lightning current time domain function, performing Fourier transformation on the double exponential lightning current time domain function to obtain the lightning current frequency domain function, and determining the distribution of the amplitude and energy at different frequencies according to the lightning current frequency domain function, thereby determining the frequency distribution characteristics of the lightning current, which is beneficial to subsequent lightning current analysis. BRIEF DESCRIPTION OF DRAWINGS

[0068] Figure 1 is a flowchart of the arrester transferred charge analysis method provided by the embodiment of the application;

[0069] Figure 2 is a spectrum diagram of the transferred charge of the arrester provided by the embodiment of the application;

[0070] Figure 3 is a diagram of the current density distribution on the cross section of the zinc oxide resistor at 10000Hz provided by the embodiment of the application;

[0071] Figure 4 is a diagram of the current density distribution on the cross section of the zinc oxide resistor at 60000Hz provided by the embodiment of the application;

[0072] Figure 5 is a diagram of the current density distribution on the cross section of the zinc oxide resistor at 550000Hz provided by the embodiment of the application;

[0073] Figure 6 is a diagram of the current density distribution on the cross section of the zinc oxide resistor at 550000Hz provided by the embodiment of the application;

[0074] Figure 7 is a structural diagram of the arrester transferred charge analysis device provided by the embodiment of the application. DETAILED DESCRIPTION

[0075] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0076] In the description of the present application, it should be understood that the terms "first", "second" are used only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can be explicitly or implicitly included one or more features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0077] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For a person of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0078] It should be noted that in the international standard of IEC 60099-4:2014, the long duration current impulse resistance test is replaced by the repeated charge transfer capacity test, and the energy resistance capacity of the line arrester is tested by the amount of charge passing through the resistance sheet, and the half-wave sinusoidal current is used instead of 2ms square wave as the impulse current.

[0079] When the current passing through a certain conductor is direct current, the internal electromagnetic field is static electromagnetic field, and the current of any cross section in the conductor is uniformly distributed. When there is alternating current in the conductor or alternating electromagnetic field in the surrounding environment, this magnetic field will generate induced electromotive force in the conductor, and then cause induced eddy current. These induced eddy currents will cause the current density to gradually decrease from the surface to the center in the conductor, which is called skin effect. For low frequency current, the skin effect has little effect, and the current can be regarded as uniformly distributed. With the increase of frequency, the effect becomes significant, and the current may even be concentrated on the surface of the conductor. Due to the Joule heat effect, the temperature near the surface of the conductor is high, and the temperature near the center of the conductor is low.

[0080] The skin depth refers to the depth reached by the current density on the cross section of the conductor from the surface to 1 / e (about 37%) of the maximum value when the alternating current passes through the conductor, and the size of the skin depth is related to the frequency f (ω) and the physical properties of the conductor itself, and can be considered to satisfy the following relationship:

[0081]

[0082] Wherein, Δ is the skin depth, ω is the angular frequency, μ is the magnetic permeability of the conductor material, and δ is the electrical conductivity of the material. It can be seen that the size of the skin depth is inversely proportional to the size of the angular frequency, that is, inversely proportional to the size of the frequency f, and the greater the frequency, the more the current is concentrated on the surface of the conductor. In addition, the skin depth is also related to the magnetic permeability and electrical conductivity of the conductor. From the foregoing calculation results of the shielding and the characteristics of the zinc oxide lightning arrester, it can be seen that the current waveform passing through the arrester is close to the original lightning current waveform when shielding occurs. According to the voltage-current characteristic of the zinc oxide resistor disc, under the impact of the shielding lightning current, the resistor disc works in the breakdown area and the large current area, and the resistance is small, which can be considered as a good conductor. The lightning current has very many high frequency components, and under the action of the lightning current, the skin effect depth may be less than the radius of the zinc oxide resistor disc, so the influence of the skin effect cannot be ignored when the lightning current passes through the arrester, that is, the influence of the skin effect needs to be considered in the subsequent simulation, and the transfer charge of the lightning arrester needs to be analyzed.

[0083] Referring to Figure 1 The embodiment of the present application provides a lightning arrester transfer charge analysis method, which comprises the following steps:

[0084] S1, obtaining the amplitude of the lightning current, and calculating the lightning current frequency domain function according to the amplitude of the lightning current;

[0085] In the embodiment of the present application, the acquisition method of the lightning current amplitude includes direct measurement, indirect measurement, lightning arrester action record and the like;

[0086] The direct measurement includes: under safe conditions, using high-precision current measurement equipment such as Rogowski coil. The amplitude of the lightning current is directly measured by using the lightning current measurement equipment.

[0087] The indirect measurement includes: obtaining the electromagnetic field change caused by lightning stroke, and calculating the amplitude of the lightning current according to the electromagnetic field change data;

[0088] The lightning arrester action record includes: obtaining the action times and current values recorded by the lightning arrester during discharge, and determining the amplitude of the lightning current according to the action times and current values.

[0089] S2, calculating the lightning current transfer charge frequency domain function according to the lightning current frequency domain function and the introduced correction coefficient;

[0090] In the embodiment of the present application, after the lightning current frequency domain function is fitted, a correction coefficient is introduced to calculate the lightning current transfer charge frequency domain function, and the lightning current frequency domain function is adjusted by introducing the correction function, which can effectively avoid the analysis error of the lightning current transfer charge, thereby effectively improving the accuracy and reliability of the lightning current transfer charge analysis.

[0091] S3, the amplitude spectrum function of the lightning current transfer charge is calculated according to the lightning current transfer charge frequency domain function, and the amplitude frequency of the total amount of the lightning current transfer charge tends to positive infinity, and the ratio of the amplitude spectrum function to the amplitude frequency is taken as the relative transfer charge amplitude spectrum of the lightning current.

[0092] In the embodiment of the present application, the relative transfer charge amplitude spectrum is obtained by comparing the amplitude spectrum function of the lightning arrester with the amplitude spectrum function, which can predict the performance of the lightning arrester in the actual lightning strike event.

[0093] Further, step S1, the lightning current frequency domain function is calculated according to the amplitude of the lightning current, comprising:

[0094] The double exponential lightning current time domain function is constructed according to the amplitude of the lightning current, and the Fourier transform of the double exponential lightning current time domain function is performed to obtain the lightning current frequency domain function.

[0095] In the embodiment of the present application, the expression of the double exponential lightning current time domain function is as follows:

[0096] i(t)=I0(e -αt -e -βt )

[0097] Wherein, t represents time, alpha, beta are constants, I0 is the amplitude of the lightning current, e is the base of natural logarithm, e=1+1 / 1!+1 / 2!+1 / 3!+...+1 / n!+..., n is a natural number.

[0098] The embodiment of the present application can accurately fit the actual observed lightning current waveform by constructing the double exponential lightning current time domain function, and can determine the distribution of the amplitude and energy at different frequencies according to the lightning current frequency domain function, thereby determining the frequency distribution characteristics of the lightning current, which is beneficial to subsequent lightning current analysis.

[0099] In one embodiment, the expression of the lightning current frequency domain function is as follows:

[0100]

[0101] In the formula, I(ω) is the lightning current frequency domain function, omega is the angular frequency, j is the imaginary unit, j 2 =-1.

[0102] In one embodiment, step S2, the lightning current transfer charge frequency domain function is calculated according to the lightning current frequency domain function and the introduced correction coefficient, including:

[0103] S21, the arrester absorption energy spectrum is calculated according to the resistance chip resistance of the arrester, the resistance chip residual voltage of the arrester and the lightning current frequency domain function:

[0104]

[0105] Wherein, W(ω) is the arrester absorption energy spectrum, R is the resistance chip resistance of the arrester, U is the resistance chip residual voltage of the arrester;

[0106] In the embodiment of the application, it is known from the voltage-current characteristic of the arrester that the resistance is a nonlinear resistance which decreases with the gradual increase of current, and when the lightning current passes through the resistance chip, the resistance chip mainly works in the breakdown region, that is:

[0107]

[0108] U0 is a certain residual voltage value 1.5U 额 ~ 3.0U 额 In order to simplify the analysis while ensuring accuracy, the transfer charge quantity is taken as the examination of the energy absorption of the arrester, and the transfer charge quantity of the arrester under lightning impulse is:

[0109]

[0110] S22, the lightning current transfer charge frequency domain function is calculated based on the arrester absorption energy spectrum and the introduced correction coefficient:

[0111]

[0112] Wherein, Q(ω) is the lightning current transfer charge frequency domain function, and k is the correction coefficient.

[0113] In the embodiment of the application, k is the correction coefficient, and when α and β are valued to obtain a specific lightning current waveform, the correction effect is achieved.

[0114] The related parameters corresponding to the commonly used lightning current wave head time / peak half value time 2.6us / 50us, 8us / 20us and 0.25us / 100us lightning current waveforms are as shown in Table 1:

[0115] Table 1: Parameters corresponding to commonly used lightning current waveforms

[0116]

[0117] In one embodiment, the expression of the amplitude spectrum function of the lightning current transfer charge is as follows:

[0118]

[0119] wherein,

[0120]

[0121] |Q(ω)| is the amplitude spectrum function of the lightning current transferred charge, A, B introduce parameters.

[0122] In one embodiment, the expression of the amplitude frequency of the total amount of lightning current transferred charge is as follows:

[0123]

[0124] wherein, |Q(+∞)| is the amplitude frequency of the total amount of lightning current transferred charge.

[0125] In one embodiment, after taking the ratio of the amplitude spectrum function to the amplitude frequency as the relative transferred charge amplitude spectrum of the lightning current, it further comprises:

[0126] S4, obtaining the relative transferred charge amplitude cumulative spectrum curve under different lightning waveform parameters by simulating the relative transferred charge amplitude spectrum.

[0127] Please refer to Figure 2 , the transferred charge cumulative spectrum curve under different lightning waveform parameters is calculated in matlab when the total amount of transferred charge is 1C (110kV line arrester rated transferred charge amount) as shown in Figure 2 .

[0128] S5, determining the distribution frequency interval of the lightning current energy and the lightning current amplitude according to the relative transferred charge amplitude cumulative spectrum curve.

[0129] In the embodiment of the present application, determining the distribution frequency interval of the lightning current energy and the lightning current amplitude can optimize the arrester accordingly.

[0130] Please continue to refer to Figure 2 , the amount of transferred charge in each frequency band is obtained from Figure 2 , the curve in the figure becomes flatter and flatter as the frequency increases, indicating that the amount of transferred charge at high frequency gradually decreases; at the same time, as the current steepness increases, the proportion of transferred charge at high frequency increases, indicating that the greater the steepness, the more the high frequency component of the lightning current. From table 2 below, it can also be seen that the high frequency content of 0.25μs / 100μs lightning current is more, so the skin effect of this waveform is more obvious, and when multiple lightning strikes occur, the steepness of the subsequent lightning strike is greater, and the skin effect cannot be ignored, and the current proportion in the 0-20kHz frequency band is between 44% and 64%.

[0131] Table 2 Charge amount in each frequency band under different lightning current waveforms

[0132]

[0133] The frequency domain analysis of the skin effect on the single piece of resistance sheet is selected, the resistance sheet radius is 30mm, the conductivity value is related to the voltage-current characteristic, the current is 20kA, and the simulation calculation result is as shown in Figures 3-6 .

[0134] If the skin effect is not considered, the current density of the resistance sheet is 7.08*10^6 A / m 2 When the frequency is 10kHz, the current density on the resistance sheet ranges from 7.06*10^6 A / m to 7.14*10^6 A / m 2 , it is considered that the skin effect is not obvious in the frequency range of 0-20kHz, when the frequency is 60kHz, the current density on the resistance sheet ranges from 6.63*10^6 A / m to 9.01*10^6 A / m 2 , and when the frequency reaches 550kHz, the current density on the resistance sheet ranges from 1.3*10^6 A / m to 25.5*10^6 A / m 2 , according to the formula, the skin depth is about 7.5mm, and the skin effect is very obvious.

[0135] The embodiment of the present application has the following beneficial effects:

[0136] The embodiment of the present application adjusts the lightning current frequency domain function by introducing a correction function, which can effectively avoid the analysis error of lightning current transfer charge, thereby effectively improving the accuracy and reliability of lightning current transfer charge analysis.

[0137] Further, the embodiment of the present application constructs a double exponential lightning current time domain function, performs Fourier transformation on the double exponential lightning current time domain function to obtain a lightning current frequency domain function, can accurately fit the actual observed lightning current waveform, and can determine the distribution of amplitude and energy at different frequencies according to the lightning current frequency domain function, thereby determining the frequency distribution characteristics of the lightning current, which is beneficial to subsequent lightning current analysis.

[0138] Please refer to Figure 7 , based on the same inventive concept as the above embodiment, a lightning arrester transfer charge analysis device, comprising:

[0139] The lightning current frequency domain function calculation module 10 is used for acquiring the lightning current amplitude, and calculating the lightning current frequency domain function according to the lightning current amplitude;

[0140] The transfer charge frequency domain function calculation module 20 is used for calculating the lightning current transfer charge frequency domain function according to the lightning current frequency domain function and the introduced correction coefficient;

[0141] The relative transfer charge amplitude spectrum determination module 30 is configured to calculate the amplitude spectrum function of the transfer charge of the lightning current according to the lightning current transfer charge frequency domain function, and the amplitude frequency of the total amount of the transfer charge of the lightning current when the frequency tends to positive infinity, and take the ratio of the amplitude spectrum function to the amplitude frequency as the relative transfer charge amplitude spectrum of the lightning current.

[0142] In one embodiment, the lightning current frequency domain function calculation module 10 is further configured to:

[0143] According to the amplitude of the lightning current, a double exponential lightning current time domain function is constructed, and the Fourier transform of the double exponential lightning current time domain function is performed to obtain the lightning current frequency domain function.

[0144] In one embodiment, the expression of the double exponential lightning current time domain function is as follows:

[0145] i(t)=I0(e -αt -e -βt )

[0146] Wherein, t represents time, a and β are constants, I0 is the amplitude of the lightning current, e is the base of natural logarithm, e = 1 + 1 / 1! + 1 / 2! + 1 / 3! +... + 1 / n! +..., and n is a natural number.

[0147] In one embodiment, the expression of the lightning current frequency domain function is as follows:

[0148]

[0149] In the formula, I(ω) is the lightning current frequency domain function, ω is the angular frequency, and j is the imaginary unit.

[0150] In one embodiment, the transfer charge frequency domain function calculation module 20 is further configured to:

[0151] According to the resistance of the resistance disc of the lightning arrester, the residual voltage of the resistance disc of the lightning arrester, and the lightning current frequency domain function, the lightning arrester energy absorption spectrum is calculated:

[0152]

[0153] Wherein, W(ω) is the lightning arrester energy absorption spectrum, R is the resistance of the resistance disc of the lightning arrester, and U is the residual voltage of the resistance disc of the lightning arrester.

[0154] Based on the lightning arrester energy absorption spectrum and the introduced correction coefficient, the lightning current transfer charge frequency domain function is calculated:

[0155]

[0156] Wherein, Q(ω) is the lightning current transfer charge frequency domain function, and k is the correction coefficient.

[0157] In one embodiment, the expression of the amplitude spectrum function of the lightning current transfer charge is as follows:

[0158]

[0159] Wherein,

[0160]

[0161] |Q(ω)| is the amplitude spectrum function of the lightning current transfer charge, A and B are introduced parameters.

[0162] In one embodiment, the expression of the amplitude frequency of the total amount of lightning current transfer charge is as follows:

[0163]

[0164] Wherein, |Q(+∞)| is the amplitude frequency of the total amount of lightning current transfer charge.

[0165] In one embodiment, the device comprises:

[0166] The cumulative spectrum curve determination module is used to obtain the relative transfer charge amplitude cumulative spectrum curve under different lightning waveform parameters by simulating the relative transfer charge amplitude spectrum.

[0167] The lightning current analysis module is also used to determine the distribution frequency interval of the lightning current energy and the lightning current amplitude according to the relative transfer charge amplitude cumulative spectrum curve.

[0168] Correspondingly, one embodiment of the present application also provides a terminal device, which comprises a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, and the processor implements the lightning arrester transfer charge analysis method of any one of the above embodiments when executing the computer program.

[0169] The terminal device of this embodiment comprises a processor, a memory, and a computer program and computer instructions stored in the memory and executable on the processor. The processor implements the steps in the above embodiment one when executing the computer program, such as Figure 1 The steps S1 to S3 shown. Alternatively, the processor implements the functions of each module / unit in the above device embodiment when executing the computer program, such as the transfer charge frequency domain function calculation module 20.

[0170] For example, the computer program can be divided into one or more modules / units, one or more modules / units are stored in the memory and executed by the processor to complete the present application. One or more modules / units can be a series of computer program instruction segments capable of completing a specific function, which are used to describe the execution process of the computer program in the terminal device. For example, the transfer charge frequency domain function calculation module 20 is used to calculate the lightning current transfer charge frequency domain function according to the lightning current frequency domain function and the introduced correction coefficient.

[0171] The terminal device can be a desktop computer, a notebook computer, a palm computer, a cloud server and the like. The terminal device can include, but is not limited to, a processor, a memory. Those skilled in the art can understand that the schematic diagram is only an example of the terminal device, and does not constitute a limitation on the terminal device, and can include more or fewer components than the diagram, or combine certain components, or different components, for example, the terminal device can also include an input / output device, a network access device, a bus and the like.

[0172] The processor can be a central processing unit (CPU), and can also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor and the like. The processor is the control center of the terminal device, and connects all parts of the terminal device through various interfaces and lines.

[0173] The memory can be used to store computer programs and / or modules, and the processor realizes various functions of the terminal device by running or executing the computer programs and / or modules stored in the memory, and calling data stored in the memory. The memory can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, at least one application required by a function, etc.; the data storage area can store data created according to the use of the terminal device, etc. In addition, the memory can include a high-speed random access memory, and can also include a nonvolatile memory, for example, a hard disk, a memory, a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, at least one magnetic disk storage device, a flash memory device, or other volatile solid-state memory devices.

[0174] The modules / units integrated in the terminal device, if realized in the form of software function units and sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the above-mentioned embodiment methods can also be completed by a computer program instructing related hardware, and the computer program can be stored in a computer-readable storage medium. When the computer program is executed by a processor, the steps of each method embodiment described above can be implemented. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or some intermediate forms, etc. The computer-readable medium can include any entity or device capable of carrying computer program code, recording medium, U disk, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal, and software distribution medium, etc. It should be noted that the content included in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction, for example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium does not include electrical carrier signals and telecommunication signals.

[0175] Correspondingly, one embodiment of the present application also provides a computer-readable storage medium, which includes a stored computer program, wherein when the computer program is running, the device where the computer-readable storage medium is located performs the lightning arrester charge transfer analysis method according to any one of the above embodiments.

[0176] The above specific embodiments further illustrate the purpose, technical solutions, and beneficial effects of the present application. It should be understood that the above are only specific embodiments of the present application and are not used to limit the protection scope of the present application. It is particularly pointed out that any modification, equivalent replacement, improvement, etc. made by those skilled in the art within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A method for analyzing charge transfer in surge arresters, characterized in that, include: Obtain the amplitude of the lightning current, and calculate the frequency domain function of the lightning current based on the amplitude of the lightning current; Based on the lightning current frequency domain function and the introduced correction coefficient, the lightning current transferred charge frequency domain function is calculated. The amplitude spectrum function of the lightning current transferred charge is calculated based on the frequency domain function of the lightning current transferred charge, and the amplitude frequency of the total amount of lightning current transferred charge when the frequency approaches positive infinity. The ratio of the amplitude spectrum function to the amplitude frequency is taken as the relative transferred charge amplitude spectrum of the lightning current.

2. The surge arrester charge transfer analysis method as described in claim 1, characterized in that, The calculation of the lightning current frequency domain function based on the lightning current amplitude includes: A double-exponential lightning current time-domain function is constructed based on the lightning current amplitude, and a Fourier transform is performed on the double-exponential lightning current time-domain function to obtain the lightning current frequency-domain function.

3. The surge arrester charge transfer analysis method as described in claim 2, characterized in that, The expression for the double-exponential lightning current time-domain function is as follows: i(t)=I0(e -αt -Alright -βt ) Where t represents time, α and β are constants, I0 is the amplitude of the lightning current, and e is the base of the natural logarithm, e = 1 + 1 / 1! + 1 / 2! + 1 / 3! + ... + 1 / n! + ..., where n is a natural number.

4. The surge arrester charge transfer analysis method as described in claim 3, characterized in that, The expression for the frequency domain function of the lightning current is as follows: In the formula, I(ω) is the frequency domain function of lightning current, ω is the angular frequency, and j is the imaginary unit.

5. The surge arrester charge transfer analysis method as described in claim 4, characterized in that, The step of calculating the lightning current transfer charge frequency domain function based on the lightning current frequency domain function and the introduced correction coefficient includes: Based on the resistance of the surge arrester's resistor elements, the residual voltage of the surge arrester's resistor elements, and the frequency domain function of the lightning current, the energy absorption spectrum of the surge arrester is calculated: Where W(ω) is the energy absorption spectrum of the surge arrester, R is the resistance of the surge arrester's resistor element, and U is the residual voltage of the surge arrester's resistor element; Based on the absorbed energy spectrum of the surge arrester and the introduced correction coefficient, the frequency domain function of the lightning current charge transfer is calculated: Where Q(ω) is the frequency domain function of lightning current charge transfer, and k is the correction coefficient.

6. The surge arrester charge transfer analysis method as described in claim 5, characterized in that, The expression for the amplitude spectrum function of the charge transferred by the lightning current is as follows: in, |Q(ω)| is the amplitude spectrum function of the charge transferred by the lightning current, and parameters A and B are introduced.

7. The surge arrester charge transfer analysis method as described in claim 6, characterized in that, The expression for the amplitude frequency of the total charge transferred by the lightning current is as follows: Where |Q(+∞)| is the amplitude frequency of the total charge transferred by the lightning current.

8. The surge arrester charge transfer analysis method as described in claim 1, characterized in that, After using the ratio of the amplitude spectrum function to the amplitude frequency as the relative transferred charge amplitude spectrum of the lightning current, the method further includes: By simulating the amplitude spectrum of the relative transferred charge, the cumulative spectrum curves of the relative transferred charge amplitude under different lightning waveform parameters were obtained; The frequency range of lightning current energy and lightning current amplitude distribution is determined based on the cumulative spectrum curve of the relative transferred charge amplitude.

9. A surge arrester charge transfer analysis device, characterized in that, include: The lightning current frequency domain function calculation module is used to obtain the lightning current amplitude and calculate the lightning current frequency domain function based on the lightning current amplitude. The frequency domain function calculation module for transferred charge is used to calculate the frequency domain function of transferred charge of lightning current based on the frequency domain function of lightning current and the introduced correction coefficient. The relative transfer charge amplitude spectrum determination module is used to calculate the amplitude spectrum function of the lightning current transfer charge based on the frequency domain function of the lightning current transfer charge, and the amplitude frequency of the total amount of lightning current transfer charge when the frequency approaches positive infinity, and to use the ratio of the amplitude spectrum function to the amplitude frequency as the relative transfer charge amplitude spectrum of the lightning current.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored computer program; wherein, when the computer program is executed, it controls the device containing the computer-readable storage medium to perform the surge arrester charge transfer analysis method as described in any one of claims 1-8.

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