Method, device and equipment for determining soil structure when lightning strikes tower grounding device

Abstract

The application relates to a method, device and equipment for determining the soil structure of a tower grounding device when struck by lightning. The method comprises the following steps: inputting an M-component current of a lightning current waveform into a calculation model to obtain a calculated ground potential rise waveform; comparing a measured ground potential rise waveform with the calculated ground potential rise waveform to obtain a comparison result; adjusting soil resistivity according to the comparison result; updating the calculation model according to the adjusted soil resistivity; recalculating and outputting an updated calculated ground potential rise waveform by using the updated calculation model; continuously adjusting the soil resistivity until the calculated ground potential rise waveform output by the updated calculation model is consistent with the measured ground potential rise waveform; and taking the soil structure corresponding to the second soil resistivity obtained by the adjustment as the soil structure of the tower grounding device when struck by lightning. The method realizes the determination of the soil structure of the tower grounding device when struck by lightning and facilitates the understanding of the time-varying characteristics of the impulse grounding impedance of the tower grounding device.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tower grounding device, and particularly relates to a method, device and equipment for determining soil structure of tower grounding device during lightning. BACKGROUND

[0002] Lightning is one of the main causes of transmission line trip. According to historical data of power system, the number of lightning trips of transmission lines with voltage level of 110 kV and above exceeds thousands of times, and the number of lightning trips of transmission lines accounts for 65.4% of the total number of trips. Tower grounding device is an important guarantee measure for safe and stable operation of transmission lines, and can provide a low impedance path for abnormal current that may occur on transmission lines due to lightning or faults.

[0003] Due to the limitation of test conditions, real lightning tests based on real tower grounding devices are rarely carried out. With the help of artificial lightning test platform of lightning field scientific test base, measurement tests of impulse grounding impedance of real tower grounding device under artificial lightning conditions are carried out. In order to improve the accuracy of test arrangement, it is necessary to determine the soil structure of the tower grounding device of the artificial lightning test platform. According to the provisions of DL / T475-2017 "Guidelines for Measurement of Characteristic Parameters of Grounding Device", the measurement of soil resistivity should be carried out as much as possible in dry season and when soil is not frozen, and should not be carried out immediately after rain, snow or rain, snow. Therefore, the soil resistivity of the soil structure of the actual artificial lightning test platform tower grounding device is carried out in sunny days, and most of the artificial lightning tests are carried out in heavy rain conditions, and rainwater will reduce the surface soil resistivity, so that the surface potential distribution of the tower grounding device during lightning test may affect the test arrangement. At present, there is no method for determining the soil structure of the tower grounding device during lightning. SUMMARY

[0004] The embodiment of the present application provides a method, device and equipment for determining soil structure of tower grounding device during lightning, which is used to solve the technical problem that the soil structure of the existing tower grounding device lightning test based on artificial lightning measurement cannot be determined, resulting in inaccurate lightning test result data.

[0005] In order to achieve the above purpose, the embodiment of the present application provides the following technical scheme:

[0006] On the one hand, a method for determining soil structure of tower grounding device during lightning is provided, comprising the following steps:

[0007] Obtaining the first soil resistivity of the position where the tower grounding device is located, and inversely obtaining the soil structure of the position where the tower grounding device is located by using CDEGS software according to the first soil resistivity;

[0008] The measurement potential rise waveform and the lightning current waveform of the tower grounding device are obtained.

[0009] The drawing data of the tower grounding device is obtained, and a calculation model of the impulse grounding impedance of the tower grounding device is constructed on the CDEGS software according to the drawing data and the first soil structure. The M-component current is extracted from the lightning current waveform, and the M-component current is input into the calculation model to obtain a calculation potential rise waveform of the tower grounding device.

[0010] The amplitude of the measurement potential rise waveform is compared with the amplitude of the calculation potential rise waveform to obtain a comparison result. The first soil resistivity is continuously adjusted according to the comparison result to obtain a second soil resistivity and an updated calculation model corresponding to the second soil resistivity, until the calculation potential rise waveform output by the updated calculation model is consistent with the measurement potential rise waveform. Then, the soil structure of the tower grounding device based on the second soil resistivity is obtained as the soil structure of the tower grounding device when lightning strikes.

[0011] Preferably, obtaining the measurement potential rise waveform and the lightning current waveform of the tower grounding device for the impulse grounding impedance test comprises:

[0012] The impulse grounding impedance test is performed on the tower grounding device on an artificial lightning induction test platform.

[0013] The lightning current flowing into the tower grounding device and the measurement potential rise of the current injection point of the tower grounding device are obtained by using a measurement element.

[0014] The lightning current waveform is extracted from the lightning current, and the measurement potential rise waveform is extracted from the measurement potential rise.

[0015] Preferably, the sampling rate of the lightning current flowing into the tower grounding device and the measurement potential rise of the current injection point of the tower grounding device obtained by using the measurement element is 10 MHz.

[0016] Preferably, continuously adjusting the first soil resistivity according to the comparison result comprises:

[0017] If the amplitude of the measurement potential rise waveform is less than the amplitude of the calculation potential rise waveform, the first soil resistivity is decreased.

[0018] If the amplitude of the measurement potential rise waveform is greater than the amplitude of the calculation potential rise waveform, the first soil resistivity is increased.

[0019] Preferably, the calculation potential rise waveform output by the updated calculation model is the calculation potential rise waveform of the tower grounding device obtained by inputting the M-component current into the updated calculation model.

[0020] In another aspect, a device for determining soil structure of a tower grounding device under lightning stroke is provided, comprising a first data acquisition module, a second data acquisition module, a model construction module, and a soil structure determination module.

[0021] The first data acquisition module is configured to acquire a first soil resistivity of a location where the tower grounding device is located, and to obtain a soil structure of the location where the tower grounding device is located by using CDEGS software to inverse the first soil resistivity.

[0022] The second data acquisition module is configured to acquire a measured potential rise waveform and a lightning current waveform of the tower grounding device during an impulse grounding impedance test.

[0023] The model construction module is configured to acquire drawing data of the tower grounding device, to construct a calculation model of impulse grounding impedance of the tower grounding device on the CDEGS software according to the drawing data and the first soil structure, to extract an M-component current from the lightning current waveform, and to input the M-component current into the calculation model to output a calculated potential rise waveform of the tower grounding device.

[0024] The soil structure determination module is configured to compare an amplitude of the measured potential rise waveform with an amplitude of the calculated potential rise waveform to obtain a comparison result, to continuously adjust the first soil resistivity according to the comparison result to obtain a second soil resistivity and an updated calculation model corresponding to the second soil resistivity, and to obtain the soil structure of the tower grounding device based on the second soil resistivity as the soil structure of the tower grounding device under lightning stroke until the calculated potential rise waveform output by the updated calculation model is consistent with the measured potential rise waveform.

[0025] Preferably, the first data acquisition module is further configured to perform an impulse grounding impedance test on the tower grounding device on an artificial lightning test platform, to acquire a lightning current flowing into the tower grounding device and a measured potential rise of a current injection point of the tower grounding device by using a measurement element, to extract a lightning current waveform from the lightning current, and to extract a measured potential rise waveform from the measured potential rise.

[0026] Preferably, the first data acquisition module is further configured to acquire the lightning current flowing into the tower grounding device and the measured potential rise of the current injection point of the tower grounding device by using the measurement element and at a sampling rate of 10 MHz.

[0027] Preferably, the soil structure determination module is further configured to decrease the first soil resistivity according to the comparison result that the amplitude of the measured potential rise waveform is less than the amplitude of the calculated potential rise waveform, or to increase the first soil resistivity according to the comparison result that the amplitude of the measured potential rise waveform is greater than the amplitude of the calculated potential rise waveform.

[0028] In still another aspect, a terminal device is provided, comprising a processor and a memory;

[0029] The memory is configured to store program code and transmit the program code to the processor.

[0030] The processor is configured to execute the above-mentioned method for determining the soil structure of a tower grounding device under lightning strike according to instructions in the program code.

[0031] As can be seen from the above technical solutions, the present application has the following advantages: the method, device and equipment for determining the soil structure of a tower grounding device under lightning strike, the method comprising: obtaining a first soil resistivity of a location where the tower grounding device is located, and inversely deriving a soil structure of the location where the tower grounding device is located by using CDEGS software according to the first soil resistivity; obtaining a measured potential rise waveform and a lightning current waveform of an impulse grounding impedance test of the tower grounding device; obtaining drawing data of the tower grounding device, and constructing a calculation model of impulse grounding impedance of the tower grounding device on the CDEGS software according to the drawing data and the first soil structure; extracting an M-component current from the lightning current waveform, and inputting the M-component current into the calculation model to obtain a calculated potential rise waveform of the tower grounding device; comparing an amplitude of the measured potential rise waveform with an amplitude of the calculated potential rise waveform to obtain a comparison result; continuously adjusting the first soil resistivity according to the comparison result to obtain a second soil resistivity and an updated calculation model corresponding to the second soil resistivity, until the calculated potential rise waveform output by the updated calculation model is consistent with the measured potential rise waveform, and then obtaining the soil structure of the tower grounding device based on the second soil resistivity as the soil structure of the tower grounding device under lightning strike. The method for determining the soil structure of the tower grounding device under lightning strike obtains the measured potential rise waveform and the lightning current waveform through the constructed calculation model and the test process, inputs the M-component current of the lightning current waveform into the calculation model to obtain the calculated potential rise waveform, then compares the measured potential rise waveform with the calculated potential rise waveform to obtain the comparison result, adjusts the soil resistivity according to the comparison result, updates the calculation model according to the adjusted soil resistivity, recalculates and outputs the updated calculated potential rise waveform through the updated calculation model, continuously adjusts the soil resistivity, until the calculated potential rise waveform output by the updated calculation model is consistent with the measured potential rise waveform, and the second soil resistivity corresponding to the adjustment is the soil structure of the tower grounding device under lightning strike, which realizes the determination of the soil structure of the tower grounding device under lightning strike, facilitates the accurate understanding of the time-varying characteristics of the impulse grounding impedance of the grounding net of the tower grounding device, and helps to improve the analysis level of the tower grounding device of the power transmission line. The technical problem that the soil structure of the tower grounding device under lightning strike cannot be determined in the existing lightning strike test of the tower grounding device based on artificial lightning measurement, resulting in inaccurate lightning strike test result data, is solved. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced. Obviously, the accompanying drawings in the following description only represent some of the embodiments of the present application, and all other drawings obtained by those of ordinary skill in the art without creative effort based on these drawings also belong to the protection scope of the present application.

[0033] Figure 1 The step flow chart of the method for determining the soil structure when the tower grounding device is struck by lightning according to the embodiments of the present application;

[0034] Figure 2 The waveform graph of the ground potential rise and lightning current in the method for determining the soil structure when the tower grounding device is struck by lightning according to the embodiments of the present application;

[0035] Figure 3 The schematic diagram of the calculation model in the method for determining the soil structure when the tower grounding device is struck by lightning according to the embodiments of the present application;

[0036] Figure 4 The comparative schematic diagram of the waveform amplitude in the method for determining the soil structure when the tower grounding device is struck by lightning according to the embodiments of the present application;

[0037] Figure 5 The schematic diagram of the waveform fitting in the method for determining the soil structure when the tower grounding device is struck by lightning according to the embodiments of the present application;

[0038] Figure 6 The frame diagram of the device for determining the soil structure when the tower grounding device is struck by lightning according to the embodiments of the present application. DETAILED DESCRIPTION

[0039] In order to make the purposes, features and advantages of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings of the embodiments of the present application. Obviously, the embodiments described below only represent some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort also belong to the protection scope of the present application.

[0040] In the description of the embodiments of the present application, the terms “first”, “second” are only used for description purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with “first”, “second” can explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, the meaning of “multiple” is two or more, unless otherwise specifically limited.

[0041] In the embodiments of the present application, unless specifically defined and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0042] The embodiments of the present application provide a method, device and equipment for determining soil structure when a tower grounding device is struck by lightning, which solve the technical problem that the soil structure cannot be determined in the existing lightning strike test of the tower grounding device based on artificial lightning measurement, resulting in inaccurate lightning strike test result data.

[0043] Embodiment one:

[0044] Figure 1 The step flow chart of the method for determining soil structure when a tower grounding device is struck by lightning described in the embodiments of the present application.

[0045] As Figure 1 shown, the embodiments of the present application provide a method for determining soil structure when a tower grounding device is struck by lightning, comprising the following steps:

[0046] S1. Obtain the first soil resistivity of the position where the tower grounding device is located, and obtain the soil structure of the position where the tower grounding device is located by using CDEGS software inversion according to the first soil resistivity.

[0047] It should be noted that in step S1, the first soil resistivity of the position where the tower grounding device is located is measured by using a soil resistivity tester according to the provisions of DL / T 475-2017 "Guidelines for Measurement of Grounding Device Characteristics Parameters", and the soil structure of the position where the tower grounding device is located is obtained by least square fitting of the RESAP module of the CDEGS software.

[0048] S2. Obtain the measurement ground potential rise waveform and lightning current waveform of the tower grounding device during the impulse grounding impedance test.

[0049] It should be noted that in step S2, the impulse grounding impedance test of the tower grounding device in the lightning state is obtained, and the measurement ground potential rise waveform and lightning current waveform of the tower grounding device are obtained.

[0050] In the embodiments of the present application, obtaining the measurement ground potential rise waveform and lightning current waveform of the tower grounding device during the impulse grounding impedance test comprises:

[0051] The impulse grounding impedance test of the tower grounding device is carried out on the artificial lightning test platform;

[0052] The lightning current flowing into the tower grounding device and the measured ground potential rise of the current injection point of the tower grounding device are obtained by using the measuring element;

[0053] The lightning current waveform is extracted from the lightning current, and the measured ground potential rise waveform is extracted from the measured ground potential rise.

[0054] It should be noted that the soil structure determination method of the tower grounding device during lightning strike obtains the lightning current flowing into the tower grounding device and the measured ground potential rise of the current injection point of the tower grounding device by using a 10MHz sampling rate and a measuring element. In this embodiment, based on the artificial lightning condition, the impulse grounding impedance of the tower grounding device is measured by means of the artificial lightning test platform. The lightning current flowing into the tower grounding device through the current lead is measured by using the measuring instrument HBM of the measuring element. The position 91.44m away from the current injection point of the tower grounding device is taken as the zero potential reference point. Then, the ground potential rise of the current injection point of the tower grounding device is measured as the measured ground potential rise by using the voltage divider of the measuring element and the oscilloscope DL850. In the soil structure determination method of the tower grounding device during lightning strike, the voltage and current of the current injection point of the tower grounding device are converted into optical signals by the I / O conversion element for optical fiber transmission, and then the optical signals are converted into electrical signals by the O / I conversion element.

[0055] S3. Obtain the drawing data of the tower grounding device, and construct a calculation model of the impulse grounding impedance of the tower grounding device on the CDEGS software according to the drawing data and the first soil structure. Extract the M-component current from the lightning current waveform, and input the M-component current into the calculation model to obtain the calculated ground potential rise waveform of the tower grounding device.

[0056] It should be noted that in step S3, the calculation model of the impulse grounding impedance of the tower grounding device is constructed on the CDEGS software according to the drawing data and the first soil structure. The M-component current is extracted from the lightning current waveform in step S2, and then the M-component current is input into the constructed calculation model. The calculation model outputs the calculated ground potential rise waveform of the current injection point of the tower grounding device. In this embodiment, the construction of the model on the CDEGS software according to the parameters is a function of the CDEGS software itself, so the construction of the calculation model of the impulse grounding impedance of the tower grounding device on the CDEGS software according to the drawing data and the first soil structure is not described in detail. The M-component refers to the sudden increase of channel brightness and the rapid change of electric field in the weak light stage of the channel after the lightning return stroke. Generally, the nonlinear ionization of the soil around the tower grounding device under the action of the M-component of the lightning current can be ignored. The drawing data includes the structural drawing and the installation drawing of the tower grounding device.

[0057] S4. Comparing the amplitude of the measured ground potential rise waveform with the amplitude of the calculated ground potential rise waveform to obtain a comparison result; continuously adjusting the first soil resistivity according to the comparison result to obtain a second soil resistivity and an updated calculation model corresponding to the second soil resistivity, until the calculated ground potential rise waveform output by the updated calculation model is consistent with the measured ground potential rise waveform, then obtaining the soil structure of the tower grounding device based on the second soil resistivity as the soil structure when the tower grounding device is struck by lightning. Wherein the calculated ground potential rise waveform output by the updated calculation model is the calculated ground potential rise waveform of the tower grounding device obtained by inputting the M-component current into the updated calculation model.

[0058] It should be noted that in step S4, firstly, the measured ground potential rise waveform obtained in step S2 is compared with the calculated ground potential rise waveform calculated in step S3 to obtain a comparison result; secondly, the first soil resistivity is continuously adjusted according to the comparison result to obtain a second soil resistivity; the calculation model is updated according to the second soil resistivity, and the M-component current is recalculated through the updated calculation model until the updated calculated ground potential rise waveform is consistent with the measured ground potential rise waveform, then the soil structure corresponding to the second soil resistivity of the updated calculated ground potential waveform is the soil structure when the tower grounding device is struck by lightning. In this embodiment, if the calculated ground potential waveform output by the updated calculation model is inconsistent with the measured ground potential rise waveform, the soil resistivity is adjusted again until the updated calculated ground potential rise waveform is consistent with the measured ground potential rise waveform. Wherein, the method for determining the soil structure when the tower grounding device is struck by lightning is to adjust the surface soil resistivity of the soil resistivity to realize the adjustment of the soil resistivity.

[0059] The application provides a method for determining the soil structure of a tower grounding device when lightning strikes. The method comprises the following steps: obtaining the first soil resistivity of the position where the tower grounding device is located, and inversely calculating the soil structure of the position where the tower grounding device is located by using CDEGS software according to the first soil resistivity; obtaining the measured potential rise waveform and the lightning current waveform of the tower grounding device when the tower grounding device is subjected to an impulse grounding impedance test; obtaining the drawing data of the tower grounding device, and constructing a calculation model of the impulse grounding impedance of the tower grounding device on the CDEGS software according to the drawing data and the first soil structure; extracting the M-component current from the lightning current waveform, inputting the M-component current into the calculation model, and obtaining the calculated potential rise waveform of the tower grounding device; comparing the amplitude of the measured potential rise waveform with the amplitude of the calculated potential rise waveform, and obtaining a comparison result; continuously adjusting the first soil resistivity according to the comparison result, obtaining the second soil resistivity and an updated calculation model corresponding to the second soil resistivity, and stopping until the calculated potential rise waveform output by the updated calculation model is consistent with the measured potential rise waveform, so that the soil structure of the tower grounding device based on the second soil resistivity is obtained as the soil structure of the tower grounding device when lightning strikes. The method for determining the soil structure of the tower grounding device when lightning strikes comprises the following steps: constructing the calculation model, and obtaining the measured potential rise waveform and the lightning current waveform in the test process; inputting the M-component current of the lightning current waveform into the calculation model to obtain the calculated potential rise waveform; comparing the measured potential rise waveform with the calculated potential rise waveform to obtain a comparison result; adjusting the soil resistivity according to the comparison result; updating the calculation model according to the adjusted soil resistivity; re-calculating and outputting the updated calculated potential rise waveform by the updated calculation model; continuously adjusting the soil resistivity until the calculated potential rise waveform output by the updated calculation model is consistent with the measured potential rise waveform; and obtaining the soil structure corresponding to the second soil resistivity obtained by the adjustment as the soil structure of the tower grounding device when lightning strikes, so as to determine the soil structure of the tower grounding device when lightning strikes, facilitate accurate understanding of the time-varying characteristics of the impulse grounding impedance of the grounding net of the tower grounding device, and help improve the analysis level of the tower grounding device of the power transmission line. The technical problem that the soil structure of the tower grounding device in the lightning strike test based on artificial lightning measurement cannot be determined and the lightning strike test result data is inaccurate is solved.

[0060] In an embodiment of the application, continuously adjusting the first soil resistivity according to the comparison result comprises the following steps:

[0061] If the comparison result is that the amplitude of the measured potential rise waveform is less than the amplitude of the calculated potential rise waveform, the first soil resistivity is decreased.

[0062] If the comparison result is that the amplitude of the measured potential rise waveform is greater than the amplitude of the calculated potential rise waveform, the first soil resistivity is increased.

[0063] It should be noted that the soil structure determination method of the tower grounding device in lightning stroke compares the structure increase or decrease of the soil resistivity to change the soil structure, so that the calculated ground potential rise waveform is consistent with the measured ground potential rise waveform, and the soil structure of the tower grounding device in lightning stroke is further determined.

[0064] In the embodiment of the present application, the soil resistivity can be continuously increased or decreased by 50Ω·m, 10Ω·m, 2Ω·m, 1Ω·m, 0.5Ω·m according to the soil resistivity interval, so as to adjust the soil resistivity.

[0065] Figure 2 The waveform diagram of the ground potential rise and the lightning current in the soil structure determination method of the tower grounding device in lightning stroke, Figure 3 The schematic diagram of the calculation model in the soil structure determination method of the tower grounding device in lightning stroke, Figure 4 The comparative schematic diagram of the waveform amplitude in the soil structure determination method of the tower grounding device in lightning stroke, Figure 5 The schematic diagram of the waveform fitting in the soil structure determination method of the tower grounding device in lightning stroke.

[0066] In the embodiment of the present application, the soil structure determination method of the tower grounding device in lightning stroke is described through the following cases, which are as follows:

[0067] In the dry season of more than 3 consecutive sunny days, the soil resistivity of the position of the tower grounding device of the DET 2 / 3 measurement base artificial lightning test platform is measured by using a soil resistivity tester. According to the measured soil resistivity, the soil structure of the position of the tower grounding device is obtained by using the least square method of the RESAP module of the CDEGS software, and the soil structure is shown in Table 1. Secondly, as shown in Table 1, the measured ground potential rise waveform and the lightning current waveform of the current injection point of the tower grounding device are measured by using the artificial lightning test platform, and the voltage and current sampling rate are both 10MHz. As shown in Table 1, Figure 2 Figure 3 ​As shown, the calculation model of the tower grounding device impulse grounding impedance is established by CDEGS software according to the drawing data and the soil structure of the field measurement arrangement, the material of the 10m*10m tower grounding device is 40mm*4mm flat steel, the buried depth is 0.8m, the mesh is 5m*5m, and the 40mm*40mm*4mm angle steel is 2.5m long. If the third pulse current obtained from the lightning current is input into the calculation model as the M component current to obtain the calculation ground potential rise waveform, the measured ground potential rise waveform of the current injection point of the tower grounding device, the comparison result of the measured ground potential rise waveform and the calculated ground potential rise waveform is that the amplitude of the measured ground potential rise waveform is smaller than the amplitude of the calculated ground potential rise waveform, and then the surface soil resistivity of the soil resistivity is reduced, for example, the surface soil resistivity is 250Ω*m, 200Ω*m, 150Ω*m, 100Ω*m and 50Ω*m respectively, the calculation model is updated by adjusting the soil resistivity, the calculation ground potential rise waveform of the current injection point of the tower grounding device is calculated when the lightning current M component is output, and the amplitude of the updated calculation ground potential rise waveform is compared with the measured ground potential rise waveform, and the comparison chart is as shown in Figure 4 As shown. Figure 4 It can be seen that the amplitude of the measured ground potential rise waveform of the current injection point of the tower grounding device is between the amplitudes of the calculated ground potential rise waveforms of the surface soil resistivity between 50Ω*m and 100Ω*m. Further adjust the surface soil resistivity of the soil resistivity, when the surface soil resistivity is 72Ω*m, the measured ground potential rise waveform and the updated calculation ground potential rise waveform are consistent or consistent, as shown in Figure 5 The soil structure of the tower grounding device when lightning is struck based on artificial lightning is obtained, as shown in Table 2.

[0068] Table 1 is the soil structure of the position of the tower grounding device

[0069] Number of layers Soil resistivity (Ω.m) Thickness (m) 1 285.72 0.28 2 563.72 0.33 3 207.56 6.99 4 911.92 Infinite

[0070] Table 2 is the soil structure of the tower grounding device when lightning is struck

[0071] Number of layers Soil resistivity (Ω.m) Thickness (m) 1 72.00 0.28 2 563.72 0.33 3 207.56 6.99 4 911.92 Infinite

[0072] Example two:

[0073] Figure 6 The frame flow chart of the soil structure determination device of the tower grounding device when lightning is struck is determined.

[0074] As shown in Figure 6 The soil structure determination device of the tower grounding device when lightning is struck provided by the embodiment of the application comprises a first data acquisition module 10, a second data acquisition module 20, a model construction module 30 and a soil structure determination module 40.

[0075] The first data acquisition module 10 is configured to acquire a first soil resistivity of a position where the tower grounding device is located, and inversely derive a soil structure of the position where the tower grounding device is located by using CDEGS software according to the first soil resistivity.

[0076] The second data acquisition module 20 is configured to acquire a measured potential rise waveform and a lightning current waveform of the tower grounding device in an impulse grounding impedance test.

[0077] The model construction module 30 is configured to acquire drawing data of the tower grounding device, and construct a calculation model of the impulse grounding impedance of the tower grounding device on the CDEGS software according to the drawing data and the first soil structure; extract an M-component current from the lightning current waveform, and input the M-component current into the calculation model to output a calculated potential rise waveform of the tower grounding device.

[0078] The soil structure determination module 40 is configured to compare an amplitude of the measured potential rise waveform with an amplitude of the calculated potential rise waveform to obtain a comparison result, continuously adjust the first soil resistivity according to the comparison result, obtain a second soil resistivity and an updated calculation model corresponding to the second soil resistivity, and until the calculated potential rise waveform output by the updated calculation model is consistent with the measured potential rise waveform, obtain the soil structure of the tower grounding device based on the second soil resistivity as the soil structure of the tower grounding device when struck by lightning.

[0079] In the embodiment, the first data acquisition module 10 is further configured to perform an impulse grounding impedance test on the tower grounding device on an artificial lightning attraction test platform, acquire a lightning current flowing into the tower grounding device and a measured potential rise of a current injection point of the tower grounding device by using a measurement element, extract the lightning current waveform from the lightning current, and extract the measured potential rise waveform from the measured potential rise.

[0080] In the embodiment, the first data acquisition module 10 is further configured to acquire the lightning current flowing into the tower grounding device and the measured potential rise of the current injection point of the tower grounding device by using the measurement element and at a sampling rate of 10 MHz.

[0081] In the embodiment, the soil structure determination module 40 is further configured to, according to the comparison result that the amplitude of the measured potential rise waveform is less than the amplitude of the calculated potential rise waveform, decrease the first soil resistivity; or according to the comparison result that the amplitude of the measured potential rise waveform is greater than the amplitude of the calculated potential rise waveform, increase the first soil resistivity.

[0082] It should be noted that the modules in the device of the second embodiment correspond to the steps in the method of the first embodiment, and the content of the method for determining the soil structure of the tower grounding device when struck by lightning has been described in detail in the first embodiment, and the content of the modules in the device of the second embodiment will not be described in detail herein.

[0083] Embodiment three:

[0084] The embodiment of the present application provides a terminal device, comprising a processor and a memory.

[0085] The memory is configured to store program code and transmit the program code to the processor.

[0086] The processor is configured to execute the soil structure determination method when a tower grounding device is struck by lightning according to instructions in the program code.

[0087] It should be noted that the processor is configured to execute the steps in the soil structure determination method when a tower grounding device is struck by lightning. Alternatively, the processor executes the computer program to realize the functions of each module / unit in each system / device embodiment.

[0088] 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 is used to describe the execution process of the computer program in the terminal device.

[0089] 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 and a memory. Those skilled in the art can understand that the terminal device is not limited, and can include more or less components than the illustration, 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.

[0090] 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.

[0091] The memory can be an internal storage unit of the terminal device, such as a hard disk or a memory of the terminal device. The memory can also be an external storage device of the terminal device, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, and the like. Further, the memory can include both the internal storage unit and the external storage device of the terminal device. The memory is used to store a computer program and other programs and data required by the terminal device. The memory can also be used to temporarily store data that has been output or will be output.

[0092] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described system, device and unit can refer to the corresponding processes in the foregoing method embodiments, which will not be repeated here.

[0093] In several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of the units is only a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interface, device or unit, and can be electrical, mechanical or other forms.

[0094] The units described as separate components can or can not be physically separated, and the components shown as units can or can not be physical units, that is, they can be located in one place, or can be distributed on a plurality of network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment scheme.

[0095] In addition, each functional unit in each embodiment of the present application can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of a software functional unit.

[0096] The integrated unit, if implemented in the form of a software function unit and sold or used as an independent product, can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application essentially or say the part that contributes to the prior art or the whole or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a number of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk, and various media that can store program codes.

[0097] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for some technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for determining the soil structure during a lightning strike on a pole grounding device, characterized in that, Includes the following steps: The first soil resistivity at the location of the tower grounding device is obtained, and the soil structure at the location of the tower grounding device is obtained by inversion using CDEGS software based on the first soil resistivity. Obtain the measured ground potential rise waveform and lightning current waveform of the tower grounding device for impulse grounding impedance test; Obtain the drawing data of the tower grounding device, and construct a calculation model of the impulse grounding impedance of the tower grounding device on CDEGS software based on the drawing data and the first soil structure; extract the M component current from the lightning current waveform, input the M component current into the calculation model, and output the calculated ground potential rise waveform of the tower grounding device. The amplitude of the measured ground potential rise waveform is compared with the amplitude of the calculated ground potential rise waveform to obtain a comparison result. Based on the comparison result, the first soil resistivity is continuously adjusted to obtain the second soil resistivity and the updated calculation model corresponding to the second soil resistivity, until the calculated ground potential rise waveform output by the updated calculation model is consistent with the measured ground potential rise waveform. Then, the soil structure of the tower grounding device is obtained based on the second soil resistivity as the soil structure of the tower grounding device during lightning strike.

2. The method for determining the soil structure during a lightning strike on a pole grounding device according to claim 1, characterized in that, The measured ground potential rise waveform and lightning current waveform for the impulse grounding impedance test of the tower grounding device include: An impulse grounding impedance test was conducted on the tower grounding device on an artificial lightning triggering test platform. The lightning current flowing into the tower grounding device and the measured ground potential rise at the current injection point of the tower grounding device are obtained using measuring elements. Extract the lightning current waveform from the lightning current, and extract the measured ground potential rise waveform from the measured ground potential rise.

3. The method for determining the soil structure during a lightning strike on a pole grounding device according to claim 2, characterized in that, The sampling rate for measuring the lightning current flowing into the tower grounding device and the measured ground potential rise at the current injection point of the tower grounding device is 10MHz, using measuring elements.

4. The method for determining the soil structure during a lightning strike on a tower grounding device according to claim 1, characterized in that, Continuously adjusting the first soil resistivity based on the comparison results includes: If the comparison result shows that the amplitude of the measured ground potential rise waveform is less than the amplitude of the calculated ground potential rise waveform, then the first soil resistivity is reduced. If the comparison result shows that the amplitude of the measured ground potential rise waveform is greater than the amplitude of the calculated ground potential rise waveform, then the first soil resistivity is increased.

5. The method for determining the soil structure during a lightning strike on a pole grounding device according to claim 1, characterized in that, The calculated ground potential rise waveform output by the updated calculation model is the calculated ground potential rise waveform of the tower grounding device obtained by inputting the M component current into the updated calculation model.

6. A device for determining soil structure during lightning strikes on a pole grounding device, characterized in that, It includes a first data acquisition module, a second data acquisition module, a model building module, and a soil structure determination module; The first data acquisition module is used to acquire the first soil resistivity at the location of the tower grounding device, and to use CDEGS software to invert the soil structure at the location of the tower grounding device based on the first soil resistivity. The second data acquisition module is used to acquire the measured ground potential rise waveform and lightning current waveform of the tower grounding device during the impulse grounding impedance test; The model building module is used to acquire the drawing data of the tower grounding device, and construct a calculation model of the impulse grounding impedance of the tower grounding device on CDEGS software based on the drawing data and the first soil structure; extract the M component current from the lightning current waveform, input the M component current into the calculation model, and output the calculated ground potential rise waveform of the tower grounding device. The soil structure determination module is used to compare the amplitude of the measured ground potential rise waveform with the amplitude of the calculated ground potential rise waveform to obtain a comparison result; based on the comparison result, the first soil resistivity is continuously adjusted to obtain a second soil resistivity and an updated calculation model corresponding to the second soil resistivity, until the calculated ground potential rise waveform output by the updated calculation model is consistent with the measured ground potential rise waveform. Then, the soil structure of the tower grounding device is obtained based on the second soil resistivity as the soil structure of the tower grounding device during lightning strike.

7. The soil structure determination device for a tower grounding device during a lightning strike according to claim 6, characterized in that, The first data acquisition module is also used to conduct impulse grounding impedance tests on the tower grounding device on the artificial lightning test platform, and to use measuring elements to acquire the lightning current flowing into the tower grounding device and the measured ground potential rise at the current injection point of the tower grounding device, extract the lightning current waveform from the lightning current, and extract the measured ground potential rise waveform from the measured ground potential rise.

8. The soil structure determination device for a tower grounding device during a lightning strike according to claim 7, characterized in that, The first data acquisition module is also used to acquire the lightning current flowing into the tower grounding device and the measured ground potential rise at the current injection point of the tower grounding device by means of a sampling rate of 10MHz and a measuring element.

9. The soil structure determination device for a tower grounding device during a lightning strike according to claim 6, characterized in that, The soil structure determination module is further configured to, based on the comparison result, decrease the first soil resistivity if the amplitude of the measured ground potential rise waveform is less than the amplitude of the calculated ground potential rise waveform; or increase the first soil resistivity if the comparison result is greater than the amplitude of the measured ground potential rise waveform.

10. A terminal device, characterized in that, Including the processor and memory; The memory is used to store program code and transmit the program code to the processor; The processor is configured to execute, according to the instructions in the program code, the method for determining the soil structure of a tower grounding device during a lightning strike as described in any one of claims 1-5.

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