CN108761208B - A kind of test method of vertical demixing soil dynamic resistance - Google Patents
A kind of test method of vertical demixing soil dynamic resistance Download PDFInfo
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- 239000002689 soil Substances 0.000 title claims abstract description 95
- 238000010998 test method Methods 0.000 title claims abstract description 8
- 238000012360 testing method Methods 0.000 claims abstract description 66
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 64
- 229910052802 copper Inorganic materials 0.000 claims abstract description 51
- 239000010949 copper Substances 0.000 claims abstract description 51
- 238000011156 evaluation Methods 0.000 claims abstract description 11
- 238000005192 partition Methods 0.000 claims description 18
- 238000012545 processing Methods 0.000 claims description 18
- 238000011084 recovery Methods 0.000 claims description 12
- 238000004364 calculation method Methods 0.000 claims description 8
- 238000004891 communication Methods 0.000 claims description 6
- 239000002131 composite material Substances 0.000 claims description 6
- 238000012937 correction Methods 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 2
- 230000004888 barrier function Effects 0.000 abstract 1
- 230000005540 biological transmission Effects 0.000 description 8
- 238000012512 characterization method Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 230000001052 transient effect Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000005094 computer simulation Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
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Abstract
A kind of test method of vertical demixing soil dynamic resistance, test method include building vertical demixing soil dynamic resistance test platform, and the test box left and right side walls of test platform are provided with left copper electrode and right copper electrode；The high-voltage end that module output end is connected to high-voltage bleeder module occurs for dash current, and the high-voltage end of high-voltage bleeder module is connected to left copper electrode；Right copper electrode is connected to the ground terminal that module occurs for dash current, and ground terminal is connected to earthing module；Experimental box, when insulating barrier loading test case, is divided into more than two spaces for measuring the electric current for flowing through left copper electrode and right copper electrode by current acquisition module from bottom to up.It further include measuring soil test product pH value and filling vertical demixing soil, voltage and electric current of the measurement pedotheque in current pH value and assess soil dynamic resistance.The present invention can effective analogue ground system surrounding soil vertical demixing operating condition, accurate evaluation is carried out to soil dynamic resistance.
Description
Technical Field
The invention belongs to the technical field of power system grounding, and particularly relates to a test method of vertical layering soil dynamic resistance.
Background
When the power transmission line tower is struck by lightning, due to the existence of the grounding resistance of the tower, a very high potential can be generated at the tower top, and the over-high potential can cause the tower to impact the power transmission line, so that the power transmission line is short-circuited, and the stability and the reliability of a power system are reduced. The main function of the grounding device of the transmission line tower is to effectively discharge lightning current into the ground when the tower top or the lightning conductor is struck by lightning, so that the current flowing through the grounding device is mainly lightning impulse current. When a large impact current is injected, the resistivity of the soil is reduced, and the resistance of the soil is dynamically changed. When the electric field intensity generated by the scattered current in the soil exceeds the critical breakdown field intensity of the soil, a spark discharge process can occur in the soil around the grounding body, and the impact resistance of the soil is obviously reduced. The dynamic nature of the soil resistance helps to reduce the ground resistance of the ground system buried in the soil and, of course, also helps to reduce the transient ground potential rise at the surface of the ground. Therefore, the research on the lightning impulse characteristics of the grounding device of the power transmission and distribution tower has important significance for establishing an advanced and reliable power transmission and distribution network and a power supply system in an intelligent power grid and perfecting a power grid safety guarantee and defense system.
Because the grounding electrode of the power transmission line tower is buried in the soil, the impact characteristic of the grounding electrode is closely related to the impact characteristic of the soil around the grounding body. At present, the research on the dynamic resistance characteristics of soil in China mainly simulates the dynamic process of soil resistance and the spark discharge phenomenon through computer simulation, and the dynamic resistance characteristics of the soil resistance under the impact current are influenced by a plurality of factors, such as: the dynamic resistance characteristics of the soil under the action of high-frequency large impact current become more complex due to the impact current amplitude, the soil composition and structure, the pH value, the water content, the temperature, the external electric field intensity and the like, and the impact grounding resistance of the tower grounding device is difficult to accurately calculate. Therefore, in order to calculate the impulse grounding resistance of the grounding device more accurately, an intelligent measurement and control test platform is urgently needed for evaluating the dynamic resistance of soil impulse, considering the influence of soil pH value and soil vertical layering and used for safety evaluation of a power transmission and distribution system. The method for testing the influence of the pH value in the vertical layered soil on the dynamic resistance is provided, the transient calculation model of the grounding device under the action of the impact current is accurately established, and theoretical support is provided for the research on the impact characteristic of the tower grounding device and the optimization design of the tower grounding device.
Disclosure of Invention
The invention aims to provide a test method of a vertical layered soil dynamic resistance, which is used for accurately establishing a transient calculation model of a grounding device under the action of an impact current and providing theoretical support for the research of the impact characteristic of a tower grounding device and the optimization design of the tower grounding device.
The technical scheme for realizing the aim of the invention comprises the following steps:
the first step is as follows: a test platform for building dynamic resistance of vertically layered soil comprises
A test box; a slotted screw; the left side wall of the test box is provided with a left copper electrode and a control mechanism for controlling the left copper electrode to move transversely; the right side wall of the test box is also provided with a right copper electrode; the left copper electrode and the right copper electrode are both vertical discs; the device also comprises an insulating partition plate, a grounding module, an impulse current generating module, a high-voltage divider module, a current collecting module, an upper computer processing module, a high-voltage cable, a cable joint and a copper wire;
the output end of the impulse current generation module is connected to the high-voltage end of the high-voltage divider module, and the high-voltage end of the high-voltage divider module is connected to the left copper electrode through a high-voltage cable and a cable joint; the right copper electrode is connected to the grounding end of the impulse current generation module through a copper wire, and the grounding end is connected to the grounding module; the grounding end of the high-voltage divider module is grounded, and the communication end of the high-voltage divider module is connected to the upper computer processing module; the communication end of the current acquisition module is connected to the upper computer processing module, and the test end of the current acquisition module is connected to the copper wire and used for measuring the current flowing through the left copper electrode and the right copper electrode; the test box also comprises more than one insulating partition board, and the insulating partition boards can be horizontally inserted into or drawn out of the test box; when the insulating partition board is inserted into the test box, the test box is divided into more than two spaces from bottom to top.
The second step is that: setting the pH value of a soil sample and filling the soil: setting the pH value of a test, testing the pH value of each soil sample, adding a proper amount of pH regulator into the soil samples according to the set pH value, and fully stirring the soil samples to ensure that the pH value of the soil samples is uniformly distributed until the pH value of each soil sample is within the allowable range of the pH value error of the set test; opening a left panel of the test box, and controlling the distance between the left copper electrode and the right copper electrode through a control mechanism; determining the number of layers to be layered and the layering ratio of each layer according to the actual working condition, setting the width and the sequence of each layer according to the layering ratio, and separating the space in the test box according to the set layering width by using an insulating partition plate; after soil samples are sequentially filled in each space of the test box, removing the insulating partition plate to enable the soil samples to be attached together to form vertically layered soil; covering the left panel;
the third step: measuring the voltage and current of the soil sample at the current pH value: starting an impulse current generation module, measuring the voltage between the left copper electrode and the right copper electrode through a high-voltage divider module and transmitting the voltage to an upper computer processing module, and measuring the current flowing through the left copper electrode and the right copper electrode through a current acquisition module and transmitting the current to the upper computer processing module;
the fourth step: evaluating the dynamic resistance characteristics of the soil: obtaining a soil resistance full time domain R (t) waveform curve through the voltage and the current obtained by the upper computer processing module (15), and extracting R (t)min，R(t)maxTime of fall Δ t1And effective recovery time Δ t2Calculating the average decreasing rate k of the soil resistance under the impact current:
wherein R (t)minIs the minimum value of resistance in the R (t) waveform curve, R (t)maxIs the maximum value of resistance, Δ t, in the R (t) waveform curve1Denotes R (t) from the maximum value R (t)maxDown to a minimum value R (t)minThe time interval of (c);
calculation of R (t)minComposite evaluation factor q with k1：
Calculation of R (t)minAnd Δ t1Composite judgment factor q of2：
Calculating the minimum radius of curvature γ:
wherein,
in the formula, tm∈[ta+0.1,tb)，taIs R(t)maxCorresponding time tbIs R (t)minCorresponding to the time, the above formula shows that the R (t) wave curve is calculated in the descending time period from taCalculating the curvature radius of each time at +0.1 time at intervals of 0.1 mus, and calculating the minimum curvature radius;
calculating a correction coefficient k taking into account the pH and the minimum radius of curvature gamma1：
In the formula, pH is the current pH value, and gamma is the minimum curvature radius;
computing and judging remainder q3：
q3＝0.02081log(0.311Δt1+0.393Δt2-40.07)
-0.080log(R(t)min+0.870)
In the formula,. DELTA.t2Denotes R (t) from R (t)minRising to effective recovery resistance R (t)effThe time of (d); wherein R (t)eff＝R(t)min+0.8(R(t)max-R(t)min),R(t)effRepresents the minimum value of the resistance R (t)minGradual recovery, when the recovery amount is 80% of the maximum decrease difference (R (t))max-R(t)min) A resistance value corresponding to the time;
calculating the dynamic resistance characteristic evaluation factor of the soil under the impact current and the pH value as follows:
q＝k1(q1+q2)+q3
when q is belonged to (0, 0.25), the dynamic characteristic of the characterization resistance is weaker, when q is belonged to (0.25, 0.65), the dynamic characteristic of the characterization resistance is general, when q is belonged to (0.65, 0.9), the dynamic characteristic of the characterization resistance is stronger, and when q is belonged to (0.9, 1), the dynamic characteristic of the characterization resistance is extremely strong.
The fifth step: and (3) performing dynamic resistance test on vertical layered soil with different pH values: and setting different test pH values, and repeatedly testing according to the second to fourth steps under different set pH values to evaluate the dynamic resistance of the vertically layered soil under different pH values.
The beneficial effect of the invention is that,
1) the soil is vertically layered, the dynamic resistance of the vertically layered soil is evaluated, and the vertical layering working condition of the soil around the grounding system can be effectively simulated;
2) the full-time-domain variation waveform curve of the vertical layered soil resistance with different pH values under the action of the impact current can be accurately obtained, and the vertical layered soil dynamic resistance can be accurately evaluated by using the evaluation factor;
3) the experiment platform is convenient to operate, safe and reliable, and has universality on the experiment of vertical multilayer soil.
Drawings
FIG. 1 is a schematic diagram of the general structure of the test platform according to the present invention;
FIG. 2 is a flow chart of the test method of the present invention;
FIG. 3 is a graphical illustration of a full time domain dynamic variation waveform reflecting soil resistance.
Detailed Description
The invention will be further explained with reference to the drawings.
Fig. 1 and fig. 2 show that the test platform and the method provided by the present invention include the following steps:
the first step is as follows: building vertical layered soil dynamic resistance test platform
The test platform comprises a test box (01); a slotted screw (02); the left side wall of the test box (01) is provided with a left copper electrode (04) and an operating mechanism (03) for controlling the left copper electrode (04) to move transversely; the right side wall of the test box (01) is also provided with a right copper electrode (05); the left copper electrode (04) and the right copper electrode (05) are both vertical discs; the device also comprises an insulating partition board (06), a grounding module (11), an impulse current generating module (12), a high-voltage divider module (13), a current collecting module (14), an upper computer processing module (15), a high-voltage cable (16), a cable joint (17) and a copper wire (18);
the output end of the impact current generation module (12) is connected to the high-voltage end of the high-voltage divider module (13), and the high-voltage end of the high-voltage divider module (13) is connected to the left copper electrode (04) through a high-voltage cable (16) and a cable joint (17); the right copper electrode (05) is connected to the grounding end of the impact current generation module (12) through a copper wire (18), and the grounding end is connected to the grounding module (11); the grounding end of the high-voltage divider module (13) is grounded, and the communication end is connected to the upper computer processing module (15); the communication end of the current acquisition module (14) is connected to the upper computer processing module (15), and the test end is connected to the copper wire (18) and used for measuring the current flowing through the left copper electrode (04) and the right copper electrode (05); the testing device also comprises more than one insulating partition board (06), wherein the insulating partition boards (06) can be horizontally inserted into or drawn out of the testing box (01); when the insulating partition board (06) is inserted into the test box (01), the test box (01) is divided into more than two spaces from bottom to top.
The second step is that: setting the pH value of the soil sample and filling the soil
Setting the pH value of a test, testing the pH value of each soil sample, adding a proper amount of pH regulator into the soil samples according to the set pH value, and fully stirring the soil samples to ensure that the pH value of the soil samples is uniformly distributed until the pH value of each soil sample is within the allowable range of the pH value error of the set test; opening a left panel of the test box (01), and controlling the distance between the left copper electrode (04) and the right copper electrode (05) through the control mechanism (03); determining the number of layers to be layered and the layering ratio of each layer according to the actual working condition, setting the width and the sequence of each layer according to the layering ratio, and separating the space in the test box (01) by using an insulating partition plate (06) according to the set layering width; after soil samples are sequentially filled in each space of the test box (01), the insulating partition plate (06) is removed, so that the soil samples are attached together to form vertical layered soil; covering the left panel;
the third step: measuring the voltage and current of the soil sample at the current pH value: starting an impulse current generation module (12), measuring the voltage between a left copper electrode (04) and a right copper electrode (05) through a high-voltage divider module (13) and transmitting the voltage to an upper computer processing module (15), measuring the current flowing through the left copper electrode (04) and the right copper electrode (05) through a current acquisition module (14) and transmitting the current to the upper computer processing module (15);
the fourth step: evaluating the dynamic resistance characteristics of the soil: obtaining a soil resistance full time domain R (t) waveform curve through the voltage and the current obtained by the upper computer processing module (15), and extracting R (t)min，R(t)maxTime of fall Δ t1And effective recovery time Δ t2Calculating the average decreasing rate k of the soil resistance under the impact current:
wherein R (t)minIs the minimum value of resistance in the R (t) waveform curve, R (t)maxIs the maximum value of resistance, Δ t, in the R (t) waveform curve1Denotes R (t) from the maximum value R (t)maxDown to a minimum value R (t)minThe time interval of (c);
calculation of R (t)minComposite evaluation factor q with k1：
Calculation of R (t)minAnd Δ t1Composite judgment factor q of2：
Calculating the minimum radius of curvature γ:
wherein,
in the formula, tm∈[ta+0.1,tb)，taIs R (t)maxCorresponding time tbIs R (t)minCorresponding to the time, the above formula shows that the R (t) wave curve is calculated in the descending time period from taCalculating the curvature radius of each time at +0.1 time at intervals of 0.1 mus, and calculating the minimum curvature radius;
calculating a correction coefficient k taking into account the pH and the minimum radius of curvature gamma1：
In the formula, pH is the current pH value, and gamma is the minimum curvature radius;
computing and judging remainder q3：
q3＝0.02081log(0.311Δt1+0.393Δt2-40.07)
-0.080log(R(t)min+0.870)
In the formula,. DELTA.t2Denotes R (t) from R (t)minRising to effective recovery resistance R (t)effThe time of (d); wherein R (t)eff＝R(t)min+0.8(R(t)max-R(t)min),R(t)effRepresents the minimum value of the resistance R (t)minGradual recovery, when the recovery amount is 80% of the maximum decrease difference (R (t))max-R(t)min) A resistance value corresponding to the time;
calculating the dynamic resistance characteristic evaluation factor of the soil under the impact current and the pH value as follows:
q＝k1(q1+q2)+q3
when q is belonged to (0, 0.25), the dynamic characteristic of the characterization resistance is weaker, when q is belonged to (0.25, 0.65), the dynamic characteristic of the characterization resistance is general, when q is belonged to (0.65, 0.9), the dynamic characteristic of the characterization resistance is stronger, and when q is belonged to (0.9, 1), the dynamic characteristic of the characterization resistance is extremely strong.
The fifth step: and (3) performing dynamic resistance test on vertical layered soil with different pH values: and setting different test pH values, and performing dynamic resistance evaluation on the vertically layered soil under different pH values under different set pH values. If four different pH values of the vertical layered soil dynamic resistance are to be tested, four types of pH values are set to be respectively PH1, PH2, PH3 and PH4, when the pH value is PH1, the vertical layered soil dynamic resistance test with the pH value of PH1 is carried out according to the second step, the third step and the fourth step, and after the pH value PH1 test is finished and a period of time is set, the vertical layered soil dynamic resistance test with the pH value of PH2, PH3 and PH4 is carried out respectively.
Claims (1)
1. A test method for dynamic resistance of vertically layered soil is characterized by comprising the following steps:
the first step is as follows: a test platform for building dynamic resistance of vertically layered soil comprises
A test chamber (01); a slotted screw (02); the left side wall of the test box (01) is provided with a left copper electrode (04) and an operating mechanism (03) for controlling the left copper electrode (04) to move transversely; the right side wall of the test box (01) is also provided with a right copper electrode (05); the left copper electrode (04) and the right copper electrode (05) are both vertical discs; the device also comprises an insulating partition board (06), a grounding module (11), an impulse current generating module (12), a high-voltage divider module (13), a current collecting module (14), an upper computer processing module (15), a high-voltage cable (16), a cable joint (17) and a copper wire (18);
the output end of the impact current generation module (12) is connected to the high-voltage end of the high-voltage divider module (13), and the high-voltage end of the high-voltage divider module (13) is connected to the left copper electrode (04) through a high-voltage cable (16) and a cable joint (17); the right copper electrode (05) is connected to the grounding end of the impact current generation module (12) through a copper wire (18), and the grounding end is connected to the grounding module (11); the grounding end of the high-voltage divider module (13) is grounded, and the communication end is connected to the upper computer processing module (15); the communication end of the current acquisition module (14) is connected to the upper computer processing module (15), and the test end is connected to the copper wire (18) and used for measuring the current flowing through the left copper electrode (04) and the right copper electrode (05); the testing device also comprises more than one insulating partition board (06), wherein the insulating partition boards (06) can be horizontally inserted into or drawn out of the testing box (01); when the insulating partition board (06) is inserted into the test box (01), the test box (01) is divided into more than two spaces from bottom to top;
the second step is that: setting the pH value of a soil sample and filling the soil: setting the pH value of a test, testing the pH value of each soil sample, adding a proper amount of pH regulator into the soil samples according to the set pH value, and fully stirring the soil samples to ensure that the pH value of the soil samples is uniformly distributed until the pH value of each soil sample is within the allowable range of the pH value error of the set test; opening a left panel of the test box (01), and controlling the distance between the left copper electrode (04) and the right copper electrode (05) through the control mechanism (03); determining the number of layers to be layered and the layering ratio of each layer according to the actual working condition, setting the width and the sequence of each layer according to the layering ratio, and separating the space in the test box (01) by using an insulating partition plate (06) according to the set layering width; after soil samples are sequentially filled in each space of the test box (01), the insulating partition plate (06) is removed, so that the soil samples are attached together to form vertical layered soil; covering the left panel;
the third step: measuring the voltage and current of the soil sample at the current pH value: starting an impulse current generation module (12), measuring the voltage between a left copper electrode (04) and a right copper electrode (05) through a high-voltage divider module (13) and transmitting the voltage to an upper computer processing module (15), measuring the current flowing through the left copper electrode (04) and the right copper electrode (05) through a current acquisition module (14) and transmitting the current to the upper computer processing module (15);
the fourth step: evaluating the dynamic resistance characteristics of the soil: obtaining a soil resistance full time domain R (t) waveform curve through the voltage and the current obtained by the upper computer processing module (15), and extracting R (t)min，R(t)maxTime of fall Δ t1And effective recovery time Δ t2Calculating the average decreasing rate k of the soil resistance under the impact current:
wherein R (t)minIs the minimum value of resistance in the R (t) waveform curve, R (t)maxIs the maximum value of resistance, Δ t, in the R (t) waveform curve1Denotes R (t) from the maximum value R (t)maxDown to a minimum value R (t)minThe time interval of (c);
calculation of R (t)minComposite evaluation factor q with k1：
Calculation of R (t)minAnd Δ t1Composite judgment factor q of2：
Calculating the minimum radius of curvature γ:
wherein,
in the formula, tm∈[ta+0.1,tb)，taIs R (t)maxCorresponding time tbIs R (t)minCorresponding to the time, the above formula shows that the R (t) wave curve is calculated in the descending time period from taCalculating the curvature radius of each time at +0.1 time at intervals of 0.1 mus, and calculating the minimum curvature radius;
calculating a correction coefficient k taking into account the pH and the minimum radius of curvature gamma1：
In the formula, pH is the current pH value, and gamma is the minimum curvature radius;
computing and judging remainder q3：
q3＝0.02081log(0.311Δt1+0.393Δt2-40.07)-0.080log(R(t)min+0.870)
In the formula,. DELTA.t2Denotes R (t) from R (t)minRising to effective recovery resistance R (t)effThe time of (d); wherein R (t)eff＝R(t)min+0.8(R(t)max-R(t)min),R(t)effRepresents the minimum value of the resistance R (t)minGradual recovery, when the recovery amount is 80% of the maximum decrease difference (R (t))max-R(t)min) A resistance value corresponding to the time;
calculating the dynamic resistance characteristic evaluation factor of the soil under the impact current and the pH value as follows:
q＝k1(q1+q2)+q3
representing the dynamic resistance characteristic according to the range of the dynamic resistance characteristic evaluation factor q;
the fifth step: and (3) performing dynamic resistance test on vertical layered soil with different pH values: and setting different test pH values, and repeatedly testing according to the second to fourth steps under different set pH values to evaluate the dynamic resistance of the vertically layered soil under different pH values.
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| CN111985109B (en) * | 2020-08-24 | 2021-07-20 | 西南交通大学 | Lightning protection effective size coefficient evaluation method for horizontal grounding body at different temperatures |
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| JP2001011668A (en) * | 1999-06-24 | 2001-01-16 | Sumitomo Metal Ind Ltd | Corrosion protective method of steel structure by conditioning soil |
| KR101006892B1 (en) * | 2009-05-12 | 2011-01-12 | 제주산업정보대학 산학협력단 | Ground connection resistance measurement device that top and bottom difference is possible |
| JP2014169999A (en) * | 2013-03-02 | 2014-09-18 | Fluke Corp | Ground resistance measurement device and method |
| CN106872788A (en) * | 2015-12-11 | 2017-06-20 | 天津赛思科技发展有限公司 | A kind of power grounding resistance long distance control system |
| CN106400069B (en) * | 2016-09-12 | 2019-06-07 | 国家电网公司 | A kind of anti-corrosion method of copper or copper alloy power grid earthing or grounding means in acid soil |
| CN106569038A (en) * | 2016-09-28 | 2017-04-19 | 国网山西省电力公司阳泉供电公司 | Method for testing impulse grounding resistance of pole of power transmission line |
| CN107422239A (en) * | 2017-09-27 | 2017-12-01 | 重庆大学 | The more dash current discharge test device and methods of soil |
| CN108020725B (en) * | 2017-12-01 | 2019-10-18 | 广东电网有限责任公司佛山供电局 | A kind of earth mat impulse earthed resistance measurement method under the influence of different soils pH value |
| CN107782976B (en) * | 2017-12-01 | 2019-09-10 | 广东电网有限责任公司佛山供电局 | It is a kind of meter and soil ion concentration impulse earthed resistance measurement method |
| CN108008197B (en) * | 2017-12-01 | 2019-10-22 | 广东电网有限责任公司佛山供电局 | A kind of Tower Impulse Grounding Resistance measurement method considering soil space moisture distribution |
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