CN102928673A - Method for acquiring impulse grounding resistance - Google Patents
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Abstract
本发明提供了一种获取冲击接地电阻的方法，属于高电压技术领域，包括：利用仿真方法得到大电流冲击接地电阻和工频接地电阻，并作商得到数值仿真下的、以工频接地电阻为基准的比例系数，利用小电流冲击接地电阻作为基准进行修正的方法，不论修正系数的获取手段是基于经验公式或仿真计算，利用仿真方法得到大电流冲击接地电阻和小电流冲击接地电阻，并作商得到数值仿真下的、以小电流冲击接地电阻为基准的比例系数。本发明所要解决的技术问题是提供一种获取冲击接地电阻的方法，有效获取变电站、发电厂以及输电线路杆塔的冲击接地电阻。
The invention provides a method for obtaining impact grounding resistance, which belongs to the high-voltage technical field, including: using a simulation method to obtain a large current impact grounding resistance and a power frequency grounding resistance, and obtaining the power frequency grounding resistance under numerical simulation The proportional coefficient of the benchmark, using the small current impact grounding resistance as the benchmark for correction, regardless of whether the means of obtaining the correction coefficient is based on empirical formulas or simulation calculations, use the simulation method to obtain the large current impact grounding resistance and small current impact grounding resistance, and The author obtained the proportional coefficient based on the small current impact grounding resistance under the numerical simulation. The technical problem to be solved by the present invention is to provide a method for obtaining the impulse grounding resistance, which can effectively obtain the impulse grounding resistance of substations, power plants and transmission line towers.
Description
技术领域 technical field
本发明涉及高电压技术领域，尤其涉及一种获取冲击接地电阻的方法。The invention relates to the field of high voltage technology, in particular to a method for obtaining impact grounding resistance.
背景技术 Background technique
冲击接地电阻值是发电厂、变电站以及输电线路杆塔接地系统的重要技术指标，它是评估厂站和杆塔遭受雷击时接地系统安全性、有效性的重要参数。当前对于接地系统冲击接地电阻的获取，已成为接地网设计、验收和运行过程中的必要环节，成为保障电力系统安全运行的一项重要工作。有关技术规程规定冲击接地电阻需要定期测试。The impact grounding resistance value is an important technical indicator of the grounding system of power plants, substations and transmission line towers. It is an important parameter to evaluate the safety and effectiveness of the grounding system when the power plant and tower are struck by lightning. At present, the acquisition of the grounding system impulse grounding resistance has become a necessary link in the design, acceptance and operation of the grounding grid, and an important task to ensure the safe operation of the power system. The relevant technical regulations stipulate that the impact grounding resistance needs to be tested regularly.
当前，对于冲击接地电阻的获取，主要有以下三项途径：At present, there are mainly three ways to obtain the impact grounding resistance:
1.基于大电流现场试验1. Based on large current field test
为了能够获取接地装置在雷电流冲击下的接地电阻，也可以直接进行大电流冲击试验。该方法的基本思路是：In order to obtain the grounding resistance of the grounding device under the impact of lightning current, the high current impact test can also be directly carried out. The basic idea of this method is:
1)使用大功率冲击电流发生器，将冲击电流施加于接地装置上。1) Use a high-power impulse current generator to apply the impulse current to the grounding device.
2)采用国家标准GB/T 17949.1-2000《接地系统的土壤电阻率、接地阻抗和地面电位测量导则第1部分：常规测量》推荐的电位降法，电压与电流的采集装置分别使用分压器和罗氏线圈，配合示波器记录数据。2) Adopt the potential drop method recommended by the national standard GB/T 17949.1-2000 "Guidelines for the Measurement of Soil Resistivity, Ground Impedance and Ground Potential in Grounding Systems Part 1: Conventional Measurement", and the voltage and current acquisition devices use voltage dividers respectively Detector and Rogowski coil, with the oscilloscope to record the data.
3)记录冲击电压和冲击电流波形，进而得到电压与电流的峰峰值之比，从而得到冲击接地电阻。3) Record the impulse voltage and impulse current waveforms, and then obtain the peak-to-peak ratio of the voltage and current, thereby obtaining the impulse grounding resistance.
上述方法的优点在于真实、直接、准确。主要问题不方便作为常规测量的方法，这是由于：为了在试验中充分凸显火花放电效应和接地导体感性作用对接地电阻的影响，必须使用大功率冲击电流发生器（小功率则无法充分显示电离效应，工频则无法体现接地导体感性作用，这都将会使得获取的冲击接地电阻不符合实际情况）。然而，大功率冲击电流发生器往往体积和重量庞大，开展现场试验需要耗费巨大的人力和物力，基本无法满足日常测量获取的途径。The advantage of the above method is that it is real, direct and accurate. The main problem is that it is inconvenient to use as a routine measurement method. This is because: In order to fully highlight the impact of spark discharge effects and the inductive action of grounding conductors on grounding resistance in the test, a high-power impulse current generator must be used (low power cannot fully display the ionization effect, the power frequency cannot reflect the inductive effect of the grounding conductor, which will make the obtained impact grounding resistance not in line with the actual situation). However, high-power impulse current generators are often bulky and heavy, and it takes a lot of manpower and material resources to carry out on-site tests, which basically cannot meet the needs of daily measurement and acquisition.
2.基于工频试验和冲击系数经验公式2. Based on power frequency test and empirical formula of impact coefficient
这是一种间接获取接地装置冲击接地电阻的方法。在行业标准DL/T621-1997《交流电气装置的接地》中，冲击系数定义为冲击接地电阻与工频接地电阻的比值。该方法的基本思路是：This is an indirect method to obtain the impact grounding resistance of the grounding device. In the industry standard DL/T621-1997 "Grounding of AC Electrical Installations", the impact coefficient is defined as the ratio of the impact grounding resistance to the power frequency grounding resistance. The basic idea of this method is:
1)首先，测量接地装置的工频接地电阻。工频试验测量方法采用国家标准GB/T 17949.1-2000《接地系统的土壤电阻率、接地阻抗和地面电位测量导则第1部分：常规测量》推荐的电位降法，可得到工频接地电阻。1) First, measure the power frequency grounding resistance of the grounding device. The power frequency test measurement method adopts the potential drop method recommended by the national standard GB/T 17949.1-2000 "Guidelines for the Measurement of Soil Resistivity, Ground Impedance and Ground Potential of Grounding Systems Part 1: Conventional Measurement", and the power frequency grounding resistance can be obtained.
2)进而，利用行业标准DL/T 621-1997《交流电气装置的接地》推荐的经验公式，对各种不同形状的冲击系数进行计算。2) Further, use the empirical formula recommended by the industry standard DL/T 621-1997 "Grounding of AC Electrical Installations" to calculate the impact coefficients of various shapes.
3)最后，在通过试验得到工频接地电阻、利用标准中的经验公式得到冲击系数之后，就可以根据定义计算冲击接地电阻了。3) Finally, after the power frequency grounding resistance is obtained through the test and the impact coefficient is obtained by using the empirical formula in the standard, the impact grounding resistance can be calculated according to the definition.
上述方法的优点在于测量方法简单易行，缺点在于：The advantage of the above method is that the measurement method is simple and easy, and the disadvantages are:
1)行业标准DL/T 621-1997《交流电气装置的接地》中推荐的经验公式是一种通过试验得到的拟合值，这些经验公式的获得是在特定的试验条件下获得的，而实际使用时的试验工况不可能与获取经验公式时的工况完全相符，因此通过这种方法得到的冲击接地电阻具有很大的误差。1) The empirical formula recommended in the industry standard DL/T 621-1997 "Grounding of AC Electrical Installations" is a fitting value obtained through experiments. These empirical formulas are obtained under specific test conditions, and the actual The test conditions during use cannot be completely consistent with the conditions when the empirical formula is obtained, so the impact grounding resistance obtained by this method has a large error.
2)行业标准DL/T 621-1997《交流电气装置的接地》中推荐的经验公式是根据各种接地装置的不同形状得到的，试验研究人员需要知道目标测量杆塔的形状，对于已掩埋接地装置，若形状未知，则无法适用。2) The empirical formula recommended in the industry standard DL/T 621-1997 "Grounding of AC Electrical Installations" is obtained based on the different shapes of various grounding devices. Experimental researchers need to know the shape of the target measuring tower. For buried grounding devices , which cannot be applied if the shape is unknown.
3.基于数值计算模拟仿真3. Simulation based on numerical calculation
第三种获取接地装置冲击接地电阻的方法是基于数值计算的模拟仿真方法，该方法的主要思路如下：The third method to obtain the impact grounding resistance of the grounding device is the simulation method based on numerical calculation. The main ideas of this method are as follows:
1)试验测量土壤电阻率：采用国家标准GB/T 17949.1-2000《接地系统的土壤电阻率、接地阻抗和地面电位测量导则第1部分：常规测量》推荐的四极法测量土壤显性电阻；基于数值方法，将上述土壤显性电阻测量值拟合计算，得到土壤分层结构（水平或垂直）及各层厚度与电阻率。1) Experimental measurement of soil resistivity: use the four-pole method recommended by the national standard GB/T 17949.1-2000 "Guidelines for the Measurement of Soil Resistivity, Ground Impedance and Ground Potential of Grounding Systems Part 1: Conventional Measurement" to measure soil dominant resistance ; Based on the numerical method, the above-mentioned soil explicit resistance measurement value is fitted and calculated to obtain the soil layered structure (horizontal or vertical) and the thickness and resistivity of each layer.
2)试验测量土壤50%放电电压：采集土壤样本，利用国家标准GB/T16927.1-1997《高电压试验技术第一部分：一般试验要求》推荐的方法测量土壤50%放电电压；测量土壤样本的厚度，利用电压与场强的关系得到50%放电场强。2) Test and measure the 50% discharge voltage of the soil: collect soil samples, use the method recommended by the national standard GB/T16927.1-1997 "High Voltage Test Technology Part One: General Test Requirements" to measure the 50% discharge voltage of the soil; measure the 50% discharge voltage of the soil sample Thickness, use the relationship between voltage and field strength to get 50% discharge field strength.
3)利用数值方法计算接地装置冲击接地电阻：将土壤的电阻率和50%放电电压的测量值作为已知量，配合接地装置导体的材料、长度、埋深等参数，通过数值方法，计算接地系统电压和电流的暂态关系。目前已有的数值计算方法包括电路法、传输线法和电磁场法，这些方法考虑了接地装置导体的感性作用和火花放电作用，满足一定的准确度要求。3) Calculate the impact grounding resistance of the grounding device using numerical methods: take the measured values of the resistivity of the soil and the 50% discharge voltage as known quantities, and use the numerical method to calculate the grounding Transient relationship of system voltage and current. The existing numerical calculation methods include circuit method, transmission line method and electromagnetic field method. These methods consider the inductive effect of the conductor of the grounding device and the spark discharge effect, and meet certain accuracy requirements.
上述方法的优点在于可以通过简单易行的现场试验，获取土壤参数并用以计算，进而得到各种不同接地装置的电压与电流的暂态关系。这种方法的缺点在于：The advantage of the above method is that the soil parameters can be obtained and used for calculation through simple field tests, and then the transient relationship between voltage and current of various grounding devices can be obtained. The disadvantages of this approach are:
利用国家标准推荐的四极法测量得到的土壤显性电阻，需要由数值拟合法得到土壤分层结构，包括土壤各层的厚度及电阻率。然而事实上，这种拟合法的前提为假定土壤电阻率分层结构是严格规律的水平或垂直结构，显然这与实际状况不一定相符。因此利用数值计算的方法计算得到结果不能充分反映土壤的真实状况，因此仿真结果是不可靠的。The dominant soil resistance measured by the quadrupole method recommended by the national standard needs to obtain the soil layered structure by numerical fitting method, including the thickness and resistivity of each layer of soil. However, in fact, the premise of this fitting method is to assume that the layered structure of soil resistivity is a strictly regular horizontal or vertical structure, which is obviously not necessarily consistent with the actual situation. Therefore, the results calculated by numerical calculation methods cannot fully reflect the real conditions of the soil, so the simulation results are unreliable.
综上可见，目前存在的三种获取接地装置冲击接地阻抗的方法无法很好的满足便捷性、准确性和可靠性的要求，因此，当下需要迫切解决的一个技术问题就是：如何能够提出一种有效措施，以解决现有技术存在的问题。To sum up, it can be seen that the three existing methods for obtaining the impact grounding impedance of the grounding device cannot meet the requirements of convenience, accuracy and reliability. Therefore, a technical problem that needs to be urgently solved is: how to propose a Effective measures to solve the problems existing in the prior art.
发明内容 Contents of the invention
本发明所要解决的技术问题是提供一种获取冲击接地电阻的方法，有效获取变电站、发电厂以及输电线路杆塔的冲击接地电阻。The technical problem to be solved by the present invention is to provide a method for obtaining the impulse grounding resistance, which can effectively obtain the impulse grounding resistance of substations, power plants and transmission line towers.
为了解决上述技术问题，本发明提供了一种获取冲击接地电阻的方法，包括：In order to solve the above technical problems, the present invention provides a method for obtaining impact grounding resistance, including:
利用仿真方法得到大电流冲击接地电阻和工频接地电阻，并作商得到数值仿真下的、以工频接地电阻为基准的比例系数；Use the simulation method to obtain the large current impact grounding resistance and the power frequency grounding resistance, and obtain the proportional coefficient based on the power frequency grounding resistance under the numerical simulation;
利用小电流冲击接地电阻作为基准进行修正的方法，不论修正系数的获取手段是基于经验公式或仿真计算；The method of using the small current impact grounding resistance as a reference for correction, regardless of whether the method of obtaining the correction coefficient is based on empirical formulas or simulation calculations;
利用仿真方法得到大电流冲击接地电阻和小电流冲击接地电阻，并作商得到数值仿真下的、以小电流冲击接地电阻为基准的比例系数。Using the simulation method to obtain the large current impact grounding resistance and the small current impact grounding resistance, and obtain the proportional coefficient based on the small current impact grounding resistance under the numerical simulation.
综上，本发明提供的获取冲击接地电阻的方法，能够通过试验和仿真结合的手段，考虑冲击大电流作用下接地导体的感性作用和火花放电作用，便捷、准确和可靠获取接地装置冲击接地电阻。To sum up, the method for obtaining the impact grounding resistance provided by the present invention can obtain the impact grounding resistance of the grounding device conveniently, accurately and reliably by considering the inductive effect and the spark discharge effect of the grounding conductor under the action of a large impact current by means of a combination of test and simulation. .
附图说明 Description of drawings
图1是本发明的一种获取冲击接地电阻的方法流程图。Fig. 1 is a flow chart of a method for obtaining impulse grounding resistance according to the present invention.
具体实施方式 Detailed ways
下面结合附图和具体实施方式对本发明作进一步详细的说明。The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
参照图1所示一种获取冲击接地电阻的方法流程图，所述方法具体包括：Referring to a flow chart of a method for obtaining impact grounding resistance shown in Figure 1, the method specifically includes:
步骤S101，利用仿真方法得到大电流冲击接地电阻和工频接地电阻，并作商得到数值仿真下的、以工频接地电阻为基准的比例系数；Step S101, using the simulation method to obtain the large current impact grounding resistance and the power frequency grounding resistance, and obtain the proportional coefficient based on the power frequency grounding resistance under numerical simulation;
步骤S102，利用小电流冲击接地电阻作为基准进行修正的方法，不论修正系数的获取手段是基于经验公式或仿真计算；Step S102, the method of using the small current impact grounding resistance as a reference to perform correction, regardless of whether the means of obtaining the correction coefficient is based on empirical formulas or simulation calculations;
步骤S103，利用仿真方法得到大电流冲击接地电阻和小电流冲击接地电阻，并作商得到数值仿真下的、以小电流冲击接地电阻为基准的比例系数。Step S103, using the simulation method to obtain the large current impact grounding resistance and the small current impact grounding resistance, and obtain the proportional coefficient based on the small current impact grounding resistance under numerical simulation.
本发明的主要目的是提出新型的获取冲击接地电阻的方法。该方法包含两种获取冲击接地电阻的思路：The main purpose of the present invention is to propose a novel method for obtaining impulse grounding resistance. This method includes two ideas for obtaining the impact grounding resistance:
一是通过现场试验的方法获取接地装置的工频接地电阻，进而采用数值计算的方法分别模拟仿真工频接地电阻和大电流冲击接地电阻，将两者做商得到数值仿真下的、以工频接地电阻为基准的比例系数（类似前冲击系数的概念），利用此比例系数对工频试验结果进行修正；One is to obtain the power frequency grounding resistance of the grounding device through the field test method, and then use the method of numerical calculation to simulate the power frequency grounding resistance and the large current impact grounding resistance respectively, and obtain the power frequency grounding resistance under the numerical simulation by doing the business of the two. Grounding resistance as the basis of the proportional coefficient (similar to the concept of front impact coefficient), use this proportional coefficient to correct the power frequency test results;
二是通过现场试验的方法获取接地装置的小电流冲击接地电阻，进而采用数值计算的方法分别模拟仿真小电流冲击接地电阻和大电流冲击接地电阻，将两者做商得到数值仿真下的、以小电流冲击接地电阻为基准的比例系数，利用此冲击系数对小电流冲击试验结果进行修正。The second is to obtain the small current impact grounding resistance of the grounding device through the method of field test, and then use the method of numerical calculation to simulate the small current impact grounding resistance and the large current impact grounding resistance respectively. Small current impact grounding resistance is the proportional coefficient based on this impact coefficient, and the small current impact test results are corrected by using this impact coefficient.
具体实现中，具体实现方法：In the specific implementation, the specific implementation method:
思路一的实现方法如下：The implementation method of idea 1 is as follows:
1)测量接地装置的工频接地电阻：试验测量方法均采用国家标准GB/T 17949.1-2000《接地系统的土壤电阻率、接地阻抗和地面电位测量导则第1部分：常规测量》推荐的电位降法，可得到工频接地电阻。1) Measuring the power frequency grounding resistance of the grounding device: the test and measurement methods all adopt the potential recommended by the national standard GB/T 17949.1-2000 "Guidelines for Measurement of Soil Resistivity, Grounding Impedance and Ground Potential of Grounding System Part 1: Conventional Measurement" The power frequency grounding resistance can be obtained by using the drop method.
2)试验测量土壤电阻率：采用国家标准GB/T 17949.1-2000《接地系统的土壤电阻率、接地阻抗和地面电位测量导则第1部分：常规测量》推荐的四极法测量土壤显性电阻；基于数值方法，将上述土壤显性电阻测量值拟合计算，得到土壤分层结构（水平或垂直）及各层厚度与电阻率。2) Experimental measurement of soil resistivity: use the four-pole method recommended by the national standard GB/T 17949.1-2000 "Guidelines for the Measurement of Soil Resistivity, Ground Impedance and Ground Potential of Grounding Systems Part 1: Conventional Measurement" to measure soil dominant resistance ; Based on the numerical method, the above-mentioned soil explicit resistance measurement value is fitted and calculated to obtain the soil layered structure (horizontal or vertical) and the thickness and resistivity of each layer.
3)试验测量土壤50%放电电压：采集土壤样本，利用国家标准GB/T16927.1-1997《高电压试验技术第一部分：一般试验要求》推荐的方法测量土壤50%放电电压；测量土壤样本的厚度，利用电压与场强的关系得到50%放电场强。3) Test and measure the 50% discharge voltage of the soil: collect soil samples, use the method recommended by the national standard GB/T16927.1-1997 "High Voltage Test Technology Part One: General Test Requirements" to measure the 50% discharge voltage of the soil; measure the 50% discharge voltage of the soil sample Thickness, use the relationship between voltage and field strength to get 50% discharge field strength.
4)利用数值方法计算接地装置工频接地电阻：将步骤2中得到的土壤电阻率测量值作为已知量，配合配合接地装置导体的材料、长度、埋深等参数，通过数值方法，计算接地系统电压和电流的暂态关系。目前已有的数值计算方法包括电路法、传输线法和电磁场法。4) Use the numerical method to calculate the power frequency grounding resistance of the grounding device: take the measured value of soil resistivity obtained in step 2 as a known quantity, cooperate with the parameters such as the material, length, and buried depth of the conductor of the grounding device, and calculate the grounding Transient relationship of system voltage and current. The existing numerical calculation methods include circuit method, transmission line method and electromagnetic field method.
5)利用数值方法计算接地装置大电流冲击接地电阻：将步骤2和3中得到的土壤的电阻率和50%放电电压的测量值作为已知量，配合接地装置导体的材料、长度、埋深等参数，通过数值方法，计算接地系统电压和电流的暂态关系。目前已有的数值计算方法包括电路法、传输线法和电磁场法，这些方法考虑了接地装置导体的感性作用和火花放电作用，满足一定的准确度要求。5) Use the numerical method to calculate the high-current impact grounding resistance of the grounding device: take the measured values of the soil resistivity and 50% discharge voltage obtained in steps 2 and 3 as known quantities, and match the material, length, and buried depth of the grounding device conductor And other parameters, through the numerical method, calculate the transient relationship between the voltage and current of the grounding system. The existing numerical calculation methods include circuit method, transmission line method and electromagnetic field method. These methods consider the inductive effect of the conductor of the grounding device and the spark discharge effect, and meet certain accuracy requirements.
6)求取比例系数：将步骤4和5中得到的接地装置的工频接地电阻和大电流冲击接地电阻作商，得到数值仿真下的、以工频接地电阻为基准的比例系数（类似前冲击系数的概念）。6) Calculating the proportionality coefficient: quotient the power frequency grounding resistance and the large current impact grounding resistance of the grounding device obtained in steps 4 and 5, and obtain the proportionality coefficient based on the power frequency grounding resistance under numerical simulation (similar to the previous The concept of impact coefficient).
7)利用步骤1得到的工频接地电阻和步骤6得到的比例系数作积，即可得到冲击接地电阻。7) The impact grounding resistance can be obtained by multiplying the power frequency grounding resistance obtained in step 1 and the proportional coefficient obtained in step 6.
思路二的实现方法与思路一类似，有区别的步骤在于：The implementation method of idea 2 is similar to idea 1, with the difference in steps:
1)步骤1中，测量接地装置的小电流冲击接地电阻：方法同思路一，但需要使用小电流冲击电流源；1) In step 1, measure the small current impact grounding resistance of the grounding device: the method is the same as the first idea, but need to use a small current impact current source;
2)步骤4中，利用数值方法计算接地装置小电流冲击接地电阻：方法同思路一，此时亦不考虑火花放电作用。2) In step 4, use the numerical method to calculate the small current impact grounding resistance of the grounding device: the method is the same as the idea 1, and the spark discharge effect is not considered at this time.
3)步骤6中，求取比例系数：将步骤4和5中得到的接地装置的小电流冲击接地电阻和大电流冲击接地电阻作商，得到数值仿真下的、以小电流冲击接地电阻为基准的比例系数。3) In step 6, obtain the proportional coefficient: take the small current impact grounding resistance and the large current impact grounding resistance of the grounding device obtained in steps 4 and 5 as the quotient, and obtain the numerical simulation based on the small current impact grounding resistance proportionality factor.
上述方法的优点在于：The advantages of the above method are:
与方法一相比，该方法实施过程不使用大功率冲击电流发生器等不便于试验的装置，依靠较为精确的仿真计算方法获取冲击特性，因此该方法具有便捷性。Compared with method 1, this method does not use high-power impulse current generators and other devices that are not convenient for testing, and relies on more accurate simulation calculation methods to obtain impulse characteristics, so this method is convenient.
与方法二相比，该方法使用的比例系数来源于仿真计算，特殊形状或新型的接地装置得以能够准确考虑；同时，该方法求取比例系数的过程中，利用了目标测量杆塔所处位置的实际土壤环境，这就消除了冲击系数经验公式在使用和获取两个过程中工况不符所来的误差；因此该方法具有准确性和可靠性。Compared with the second method, the proportional coefficient used in this method comes from simulation calculation, and the special shape or new grounding device can be accurately considered; at the same time, in the process of calculating the proportional coefficient in this method, the position of the target measuring tower is used. The actual soil environment, which eliminates the error caused by the inconsistent working conditions in the process of using and obtaining the empirical formula of the impact coefficient; therefore, the method is accurate and reliable.
与方法三相比，该方法增加了工频接地电阻的仿真和试验步骤，这就充分考虑了试验现场土壤分层结构不规律所带来的误差，并将其降低或消除，进一步增加了该方法的准确性和可靠性。Compared with method three, this method increases the simulation and test steps of power frequency grounding resistance, which fully considers the error caused by the irregular soil layered structure at the test site, and reduces or eliminates it, further increasing the accuracy and reliability of the method.
该方法涵盖了两种思路，条件允许时可起到相互验证的作用，或条件不允许（如没有小功率冲击电流源等）是可起到互相补充的作用。This method covers two ideas. When conditions permit, they can play a role of mutual verification, or if conditions do not allow (such as no low-power impulse current source, etc.), they can play a complementary role.
因此，可见本方案能够考虑冲击大电流作用下接地导体的感性作用和火花放电作用，具备便捷、准确和可靠的优点。Therefore, it can be seen that this scheme can consider the inductive effect and spark discharge effect of the grounding conductor under the action of large impact current, and has the advantages of convenience, accuracy and reliability.
本方案能够通过试验和仿真结合的手段，考虑冲击大电流作用下接地导体的感性作用和火花放电作用，便捷、准确和可靠获取接地装置冲击接地电阻。本方案尤其对所处地形环境复杂、土壤分层混乱的接地系统，更加有效。This scheme can take into account the inductive effect and spark discharge effect of the grounding conductor under the action of large impact current through the combination of test and simulation, and obtain the impact grounding resistance of the grounding device conveniently, accurately and reliably. This scheme is more effective especially for the grounding system where the terrain environment is complex and the soil layering is chaotic.
以上对本发明所提供的一种获取冲击接地电阻的方法进行了详细介绍，本文中应用了具体个例对本发明的原理及实施方式进行了阐述，以上实施例的说明只是用于帮助理解本发明的方法及其核心思想；同时，对于本领域的一般技术人员，依据本发明的思想，在具体实施方式及应用范围上均会有改变之处，综上所述，本说明书内容不应理解为对本发明的限制。The method for obtaining the impact grounding resistance provided by the present invention has been introduced in detail above. In this paper, specific examples are used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only used to help understand the present invention. method and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation and application scope. Invention Limitations.
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