CN109187653A - The Horizontal Layer Soil dynamic electric resistor characteristic test method of meter and different temperatures - Google Patents
The Horizontal Layer Soil dynamic electric resistor characteristic test method of meter and different temperatures Download PDFInfo
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Abstract
The Horizontal Layer Soil dynamic electric resistor characteristic test method of meter and different temperatures carries out building for Horizontal Layer Soil dynamic electric resistor attribute testing platform according to test method；According to test requirements document, stability contorting is carried out to pedotheque temperature by test platform；Under stable test temperature, soil impact experiment is carried out, the voltage and current signal of pedotheque are measured；Host computer is obtained full-time region soil resistance curve, and combine set temperature value, is evaluated soil dynamic resistance characteristic by the voltage and current signal of acquisition；It is different temperatures by platform courses pedotheque, and carries out horizontal slice soil dynamic resistance characteristic under different temperatures and test.The present invention can effective analogue ground system surrounding soil horizontal slice operating condition, realize the accurate control to temperature, the accuracy for improving test realizes the accurate evaluation to Horizontal Layer Soil dynamic electric resistor characteristic, is conducive to analyze the relevance between temperature and soil dynamic resistance.
Description
Technical Field
The invention belongs to the technical field of power system grounding, and particularly relates to a horizontal layered soil dynamic resistance characteristic test method considering different temperatures.
Background
When the power transmission line tower is struck by lightning, a very high potential can be generated on the tower body due to the existence of the tower grounding resistance, and the over-high potential can cause the tower to impact the power transmission line, so that accidents such as tripping of the power transmission line are caused, and the stability and 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. Because the lightning current amplitude is large, local breakdown of soil around the grounding body is easy to occur, the soil conductivity is increased, and the soil resistivity is reduced. In addition, when the electric field intensity generated by the scattered current in the soil exceeds the critical breakdown field intensity of the soil, a process of dynamically reducing the resistance in the soil around the grounding body occurs. The dynamic change of the soil resistance can obviously change the potential of each point on the grounding body and the potential difference between each point of the grounding body, and has obvious effect on reducing the tower top potential of the transmission line tower and the transient potential rise on the grounding network of the transformer substation. Therefore, the research on the dynamic resistance change characteristics of the soil around the grounding device of the power transmission and distribution tower under the lightning impulse has important significance for establishing an advanced and reliable power transmission and distribution network and power supply system in an intelligent power grid and perfecting a power grid safety guarantee and defense system.
Because the grounding device of the power transmission line tower is buried in the soil, the impact characteristic of the grounding device is closely related to the dynamic resistance characteristic of the soil around the grounding body. The temperature has direct influence on the movement of free charges in the soil, and the change of the temperature leads the dynamic resistance characteristics of the soil under the action of high-frequency large impact current to become more complex, so that the research on the correlation between the temperature and the dynamic resistance characteristics of the soil under the action of lightning current has important significance. For the current domestic research on the dynamic resistance characteristics of soil under the impact current, the dynamic resistance characteristic process of the soil is mainly simulated by computer simulation, and the computer simulation cannot accurately simulate the influence process of the soil pH value on the dynamic resistance characteristics of the soil. In order to research the dynamic resistance characteristics of the soil in the horizontal stratification under the action of lightning current, a test method for the dynamic resistance characteristics of the soil in the horizontal stratification at different temperatures is urgently needed, the influence of the temperature and the soil horizontal stratification can be considered, and the dynamic resistance characteristics of the soil in the horizontal stratification can be tested and analyzed at different temperatures for safety evaluation of a power transmission and distribution system.
Disclosure of Invention
The invention aims to provide a horizontal stratified soil dynamic resistance characteristic test method considering different temperatures.
The technical scheme for realizing the purpose of the invention is as follows:
the first step is as follows: a horizontal layered soil dynamic resistance characteristic test platform considering temperature is set up: the device comprises a soil test box, wherein a temperature control device is arranged on the inner wall of the soil test box, a left copper electrode is arranged on the left side wall of the soil test box, and a right copper electrode is also arranged on the right side wall of the soil test box; the left copper electrode and the right copper electrode are both vertical discs and are respectively tightly attached to the left inner wall and the right inner wall of the soil test box; the left upper part, the right upper part, the left lower part and the right lower part of the soil test box are respectively provided with a first temperature sensor, a second temperature sensor, a third temperature sensor and a fourth temperature sensor; the device comprises a grounding device, an impact current generator, a voltage divider, a temperature analyzer, a digital controller, a current acquisition module, an upper computer, a copper wire, a high-voltage cable, a cable joint, an insulating baffle and a straight screw;
wherein: the first temperature sensor, the second temperature sensor, the third temperature sensor and the fourth temperature sensor are respectively connected to the input end of a temperature analyzer, and the output end of the temperature analyzer is respectively connected to the digital controller and the upper computer; the digital controller is connected to the temperature control device; the output end of the impulse current generator is connected to the high-voltage end of the voltage divider, the high-voltage end of the voltage divider 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 generator through a wire, the grounding end is connected to the grounding device, the grounding end of the voltage divider is connected to the grounding device, and the communication end of the voltage divider is connected to the upper computer; the communication end of the current acquisition module is connected to the upper computer, and the test end of the current acquisition module is connected to the copper wire; the soil test box is characterized by also comprising more than one insulating partition plate, wherein the insulating partition plates can be vertically inserted into or pulled out of the soil test box, and when the insulating partition plates are inserted into the soil test box, the soil test box is divided into more than two spaces from left to right;
the second step is that: soil filling and temperature setting: opening the upper panel of the soil test chamber, and using an insulating partition plate to divide the soil according to the thickness ratio of the soil to be testedLayering the soil test box, and filling the soil test box with the layered soil test box; removing the insulating partition plate and attaching the soil samples together; covering the upper panel, and screwing the straight screw; monitoring the temperature through a first temperature sensor, a second temperature sensor, a third temperature sensor and a fourth temperature sensor; setting the test temperature on a temperature analyzer to be T, and if the measured temperature exceeds the error allowable upper limit TmaxThe digital controller starts a cooling mode of the temperature control device to cool, and if the temperature is lower than the lower limit T of the error allowanceminIf the soil sample in the soil test box is in the test temperature T error allowable range, the digital controller starts the temperature rising mode of the temperature control device to rise the temperature, and the temperature of the soil sample in the soil test box is controlled to be in the test temperature T error allowable range;
the third step: measuring the voltage and current of the soil sample at the current temperature T: when the measured temperature of the soil sample is stabilized within the allowable range of the test temperature T error, starting the impulse current generator, measuring the voltage between the left copper electrode and the right copper electrode through the voltage divider and transmitting the voltage to the upper computer, and measuring the current flowing through the copper wire through the current acquisition module and transmitting the current to the upper computer;
the fourth step: evaluating the dynamic resistance characteristics of the soil: the upper computer obtains a soil dynamic resistance full time domain R (t) waveform curve through the obtained voltage and current, and extracts a resistance minimum value R (t)minMaximum resistance value R (t)maxThe fall time Deltat1And effective recovery time Δ t2The upper computer evaluates the dynamic resistance characteristics of the soil according to the characteristic parameters of the R (t) wave curve and the current test temperature;
calculating the average descending rate k of the soil 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 valueR(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 taAt time +0.1, the radius of curvature at each time is calculated at intervals of 0.1 μ s, and the smallest radius of curvature among them can be calculated.
Calculating a correction coefficient k considering the temperature and the minimum curvature radius gamma from the minimum curvature radius gamma1：
Wherein T is the current test temperature.
Computing and judging remainder q3：
q3＝0.01651log(0.397Δt1+0.427Δt2-42.95)
-0.0324log(R(t)min+1.22)
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)effDenotes the minimum value of R (t) from the resistance R (t)minGradual recovery, when the recovery amount is 80% of the maximum decrease difference (R (t))max-R(t)min) The resistance value corresponding to the time.
By combining the above calculations, the evaluation factor of the dynamic resistance characteristics of the soil at the impact current and temperature is:
q＝k1(q1+q2)+q3
when q belongs to (0, 0.25), the characteristic of soil dynamic resistance is weak, when q belongs to (0.25, 0.65), the characteristic of soil dynamic resistance is general, when q belongs to (0.65, 0.9), the characteristic of soil dynamic resistance is strong, and when q belongs to (0.9, 1), the characteristic of soil dynamic resistance is strong.
The fifth step: evaluating the dynamic resistance characteristics of the soil at different temperatures: and setting different temperatures according to test requirements, repeating the third step and the fourth step, and evaluating the dynamic resistance characteristics of the horizontal stratum soil at different temperatures.
The invention has the advantages that the soil is horizontally layered, the dynamic resistance of the horizontally layered soil is measured, and the horizontal layering working condition of the soil around the grounding system can be effectively simulated. The temperature analyzer can realize accurate control of the temperature, and is beneficial to improving the test accuracy of the soil dynamic resistance and analyzing the correlation between the temperature and the soil dynamic resistance. The dynamic resistance characteristic evaluation factor can accurately evaluate the dynamic resistance of the horizontal stratified soil, and is favorable for further improving the accuracy of impact characteristic calculation. The test device is convenient to operate, safe and reliable, can be used for horizontal multi-layer soil tests and has universality.
Drawings
FIG. 1 is a schematic diagram of the general structure of the present invention;
FIG. 2 is a schematic diagram of the structure of a soil test chamber of the present invention;
FIG. 3 is a flow chart of an evaluation method in the invention;
FIG. 4 is a graphical illustration of a soil dynamic resistance full time domain variation waveform reflecting soil dynamic resistance characteristics.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings. The specific implementation mode of the horizontal layered soil dynamic resistance characteristic test method considering different temperatures comprises the following steps:
the first step is as follows: horizontal layered soil dynamic resistance characteristic test platform with consideration of temperature
As shown in fig. 1 and 2, the test platform of the present invention comprises: soil test case (06), the inner wall of soil test case (06) is provided with temperature control device (08), soil test case (06) left side wall is provided with left copper electrode (05), soil test case (06) right side wall still is provided with right copper electrode (07), left copper electrode (05) and right copper electrode (07) are vertical disc and hug closely soil test case (06) left side and right side inner wall respectively. The upper left part, the upper right part, the lower left part and the lower right part of the soil test box are respectively provided with a first temperature sensor (01a), a second temperature sensor (01b), a third temperature sensor (01c) and a fourth temperature sensor (01 d). The device is characterized by further comprising a grounding device (11), an impact current generator (12), a voltage divider (13), a temperature analyzer (14), a digital controller (15), a copper wire (16), a current acquisition module (17), an upper computer (18), a high-voltage cable (19), a cable joint (03), more than one insulating partition plate (09) and a straight screw (02).
Wherein: the first temperature sensor (01a), the second temperature sensor (01b), the third temperature sensor (01c) and the fourth temperature sensor (01d) are respectively connected to the input end of a temperature analyzer (14), and the output end of the temperature analyzer (14) is respectively connected to the digital controller (15) and the upper computer (18). The digital controller (15) is connected to the temperature control device (08). The output end of the impulse current generator (12) is connected to the high-voltage end of the voltage divider (13), and the high-voltage end of the voltage divider (13) is connected to the left copper electrode (05) through a high-voltage cable (19) and a cable joint (03). The right copper electrode (07) is connected to the ground of the surge current generator (12) through a copper wire (16), and the ground is connected to the grounding device (11). The grounding end of the voltage divider (13) is connected to the grounding device (11), and the communication end of the voltage divider (13) is connected to the upper computer (18). The communication end of the current acquisition module (17) is connected to the upper computer (18), and the test end of the current acquisition module (17) is connected to the copper wire (16). The soil test box also comprises more than one insulation partition plate (09), and the insulation partition plates (09) can be vertically inserted into or pulled out of the soil test box (06). When the insulation partition plate (09) is inserted into the soil test box (06), the soil test box (06) is divided into more than two spaces from left to right, the number of layers is the limited number of layers of actual soil, if the actual soil is divided into 3 layers, each layer is limited in thickness, the thickness ratio of the soil can be obtained, the insulation partition plate (09) separates the soil in the soil test box (06) according to the thickness ratio along the direction parallel to the surface of the electrode, and after the soil sample is filled, the insulation partition plate (09) is drawn out, and each layer of soil is tightly attached.
The second step is that: soil filling and temperature setting
Opening an upper panel of the soil test box (06), layering the soil test box (06) by using an insulating partition plate (09) according to the thickness ratio of the soil to be tested, and sequentially filling corresponding soil samples after layering; and removing the insulating partition plate (09) to enable the soil samples to be attached together.
If the soil in a certain area is horizontally layered, the thickness of the first layer of soil is 7m, the soil resistivity is 200 omega m, the thickness of the second layer of soil is 20m, the soil resistivity is 1000 omega m, the thickness of the third layer of soil is 39m, the soil resistivity is 500 omega m, and a soil area with infinite thickness is below the third layer of soil; the horizontal delamination thickness ratio is 7: 20: and 39, if the distance between the left electrode and the right electrode of the soil test chamber is S, dividing the distance according to the thickness ratio, layering the distance by using an insulating partition plate (09), and putting a soil sample into the soil test chamber, wherein the resistivity of each layer of soil of the soil sample is the same as that of the actual soil layer.
Covering the upper panel of the soil test box (06), and screwing the straight screw (02); monitoring the temperature by a first temperature sensor (01a), a second temperature sensor (01b), a third temperature sensor (01c) and a fourth temperature sensor (01 d); setting a test temperature T on a temperature analyzer (14)1The temperature analyzer calculates the average value of the temperatures measured by the four sensors, the allowable error of the temperature test is plus or minus 0.5 ℃, and if the average value of the temperatures exceeds the allowable upper limit T of the errormaxIf so, the digital controller (15) starts the cooling mode of the temperature control device (08) to cool; if the average temperature value is lower than the lower allowable error limit TminIf so, the digital controller (15) starts the temperature rising mode of the temperature control device (08) to rise the temperature; controlling the temperature of the soil sample in the soil test chamber (06) within the tolerance of the test temperature T1 (T1)min～Tmax)。
The third step: measuring the current temperature T of a soil sample1Voltage and current of time
When the soil sample measurement temperature is stabilized at the test temperature T1When the error is within the allowable range, the impulse current generator (12) is started, the voltage between the left copper electrode (05) and the right copper electrode (07) is measured through the voltage divider (13) and transmitted to the upper computer (18), and the current flowing through the copper wire (16) is measured through the current acquisition module (17) and transmitted to the upper computer (18).
The fourth step: evaluating soil dynamic resistance characteristics
As shown in FIG. 3, the machine obtains the voltage and current signalsTaking a full time domain R (t) wave curve of the soil dynamic resistance (as shown in figure 4), and extracting a resistance minimum value R (t)min(in Ω), maximum resistance R (t)max(in Ω), fall time Δ t1In μ s and effective recovery time Δ t2(unit is mu s), and the upper computer (18) evaluates the dynamic resistance characteristics of the soil according to the R (t) waveform curve and the current test temperature.
Calculating the average descending rate k of the soil 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 taAt time +0.1, the radius of curvature at each time is calculated at intervals of 0.1 μ s, and the smallest radius of curvature among them can be calculated.
Calculating a correction coefficient k considering the temperature and the minimum curvature radius gamma by combining the minimum curvature radius gamma1：
Wherein T is the current test temperature.
Computing and judging remainder q3：
q3＝0.01651log(0.397Δt1+0.427Δt2-42.95)
-0.0324log(R(t)min+1.22)
In the formula,. DELTA.t2Denotes R (t) from R (t)minRising to effective recovery resistance R (t)eff(in Ω); wherein R (t)eff＝R(t)min+0.8(R(t)max-R(t)min)，R(t)effDenotes the minimum value of R (t) from the resistance R (t)minGradual recovery, when the recovery amount is 80% of the maximum decrease difference (R (t))max-R(t)min) The resistance value corresponding to the time.
By combining the above calculations, the evaluation factor of the dynamic resistance characteristics of the soil at the impact current and temperature is:
q＝k1(q1+q2)+q3
when q belongs to (0, 0.25), the characteristic of soil dynamic resistance is weak, when q belongs to (0.25, 0.65), the characteristic of soil dynamic resistance is general, when q belongs to (0.65, 0.9), the characteristic of soil dynamic resistance is strong, and when q belongs to (0.9, 1), the characteristic of soil dynamic resistance is strong.
The fifth step: soil dynamic resistance characteristic test at different temperatures
And setting different temperatures according to the test requirements, repeating the test, and performing dynamic resistance characteristic evaluation on the horizontal stratum soil at different temperatures. If the temperature is still required to be T2、T3The dynamic resistance characteristic test of the soil of the lower horizontal layer is carried out, namely, the resistance value is T1After the test is finished and after a certain time interval, the set temperature of the temperature analyzer (14) is set to be T2Repeating the third and fourth steps to perform T2Testing the dynamic resistance characteristics of the soil at a temperature, and setting the set temperature of the temperature analyzer (14) to T after a period of time3Repeating the third and fourth steps to perform T3And (3) testing the dynamic resistance characteristics of the soil at the temperature.
Claims (1)
1. The horizontal layered soil dynamic resistance characteristic test method considering different temperatures is characterized by comprising the following steps of:
the first step is as follows: a horizontal layered soil dynamic resistance characteristic test platform considering temperature is set up: the platform includes: the temperature control device (08) is arranged on the inner wall of the soil test box (06), the left side wall of the soil test box (06) is provided with a left copper electrode (05), the right side wall of the soil test box (06) is also provided with a right copper electrode (07), and the left copper electrode (05) and the right copper electrode (07) are both vertical discs and are respectively tightly attached to the left inner wall and the right inner wall of the soil test box (06); the left upper part, the right upper part, the left lower part and the right lower part of the soil test box (06) are respectively provided with a first temperature sensor (01a), a second temperature sensor (01b), a third temperature sensor (01c) and a fourth temperature sensor (01 d); the device comprises a grounding device (11), an impact current generator (12), a voltage divider (13), a temperature analyzer (14), a digital controller (15), a copper wire (16), a current acquisition module (17), an upper computer (18), a high-voltage cable (19), a cable joint (03), more than one insulating partition plate (09) and a straight screw (02);
wherein: the temperature control device comprises a first temperature sensor (01a), a second temperature sensor (01b), a third temperature sensor (01c) and a fourth temperature sensor (01d), wherein the first temperature sensor, the second temperature sensor, the third temperature sensor and the fourth temperature sensor are respectively connected to the input end of a temperature analyzer (14), the output end of the temperature analyzer (14) is respectively connected to a digital controller (15) and an upper computer (18), and the digital controller (15) is connected to a temperature control device (08); the output end of the impulse current generator (12) is connected to the high-voltage end of the voltage divider (13), the high-voltage end of the voltage divider (13) is connected to the left copper electrode (05) through a high-voltage cable (19) and a cable joint (03), the right copper electrode (07) is connected to the grounding end of the impulse current generator (12) through a copper wire (16), the grounding end is connected to the grounding device (11), the grounding end of the voltage divider (13) is connected to the grounding device (11), and the communication end of the voltage divider (13) is connected to the upper computer (18); the device comprises a current acquisition module (17), a copper wire (16), more than one insulating partition plate (09), a soil test box (06) and a plurality of insulating partition plates (09), wherein the communication end of the current acquisition module (17) is connected to an upper computer (18), and the test end of the current acquisition module (17) is connected to the copper wire (16); when the insulating partition plate (09) is inserted into the soil test box (06), the soil test box (06) is divided into more than two spaces from left to right;
the second step is that: soil filling and temperature setting: opening an upper panel of the soil test box (06), layering the soil test box (06) by using an insulating partition plate (09) according to the thickness ratio of soil to be tested, sequentially filling corresponding soil samples after layering, removing the insulating partition plate (09), enabling the soil samples to be attached together, covering the upper panel, and screwing down the straight screw (02); monitoring soil in a soil test box (06) through a first temperature sensor (01a), a second temperature sensor (01b), a third temperature sensor (01c) and a fourth temperature sensor (01d)The temperature of the soil; setting the test temperature on the temperature analyzer (14) as T, and if the measured temperature exceeds the allowable upper limit T of the errormaxThe digital controller (15) starts a cooling mode of the temperature control device (08) to cool, and if the temperature is lower than the lower allowable error limit TminIf the soil sample in the soil test box (06) is in the test temperature T error allowable range, the digital controller (15) starts the temperature raising mode of the temperature control device (08) to raise the temperature, so that the temperature of the soil sample in the soil test box is controlled to be in the test temperature T error allowable range;
the third step: measuring the voltage and current of the soil sample at the current temperature T: when the measured temperature of the soil sample is stabilized within the allowable range of the test temperature T error, starting an impulse current generator (12), measuring the voltage between a left copper electrode (05) and a right copper electrode (07) through a voltage divider (13) and transmitting the voltage to an upper computer (18), measuring the current flowing through a copper wire (16) through a current acquisition module (17) and transmitting the current to the upper computer (18);
the fourth step: evaluating the dynamic resistance characteristics of the soil: the upper computer (18) obtains a full time domain R (t) waveform curve of the soil dynamic resistance through the obtained voltage and current signals, and extracts a minimum value R (t) of the resistanceminMaximum resistance value R (t)maxThe fall time Deltat1And effective recovery time Δ t2The upper computer (18) evaluates the dynamic resistance characteristics of the soil according to the characteristic parameters of the R (t) wave curve and the current test temperature;
calculating the average descending rate k of the soil under the impact current:
in the formula, the minimum value of resistance R (t)minMinimum value on the R (t) wave curve and maximum value of resistance R (t)maxIs the maximum value on the R (t) wave curve, Δ t1Denotes the maximum value of resistance R (t)maxDown to a minimum value of resistance 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 considering the temperature and the minimum curvature radius by combining the minimum curvature radius1：
Wherein T is the current test temperature;
computing and judging remainder q3：
q3＝0.01651log(0.397Δt1+0.427Δt2-42.95)-0.0324log(R(t)min+1.22)
In the formula,. DELTA.t2Denotes R (t) from R (t)minRising to effective recovery resistance R (t)effThe time interval of (c); wherein: r (t)eff＝R(t)min+0.8(R(t)max-R(t)min)，R(t)effDenotes the minimum value of R (t) from the resistanceR(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;
by combining the above calculations, the evaluation factor of the dynamic resistance characteristics of the soil at the impact current and temperature is:
q＝k1(q1+q2)+q3
when q belongs to (0, 0.25), the characteristic of soil dynamic resistance is weaker, when q belongs to (0.25, 0.65), the characteristic of soil dynamic resistance is general, when q belongs to (0.65, 0.9), the characteristic of soil dynamic resistance is stronger, and when q belongs to (0.9, 1), the characteristic of soil dynamic resistance is extremely strong;
the fifth step: and (3) performing a soil dynamic resistance characteristic test at different temperatures: and setting different temperatures according to test requirements, repeating the third step and the fourth step, and performing a dynamic resistance characteristic test of the horizontal stratum soil at different temperatures.
Priority Applications (1)
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111948482A (en) * | 2020-08-24 | 2020-11-17 | 西南交通大学 | Grounding electrode frequency sensitivity characteristic test evaluation method considering temperature and soil type |
| CN111985109A (en) * | 2020-08-24 | 2020-11-24 | 西南交通大学 | Lightning protection effective size coefficient evaluation method for horizontal grounding body at different temperatures |
| CN112305018A (en) * | 2020-09-29 | 2021-02-02 | 广东电网有限责任公司 | True simulation detection device for heat dissipation effect of low-thermal-resistance cable filling medium |
| WO2021043024A1 (en) * | 2019-09-05 | 2021-03-11 | 国网内蒙古东部电力有限公司检修分公司 | Ground electrode environment and ground current measurement platform based on mixed soil model |
| CN112526302A (en) * | 2020-11-30 | 2021-03-19 | 广东电网有限责任公司佛山供电局 | Line overshoot tolerance characteristic test platform and evaluation method under multi-environment factors |
| CN115655374A (en) * | 2022-11-07 | 2023-01-31 | 中国矿业大学 | Cable fault detection system and method based on temperature error correction function |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004184384A (en) * | 2002-12-02 | 2004-07-02 | Sankosha Corp | Lightning current measuring method |
| CN102866301A (en) * | 2012-09-18 | 2013-01-09 | 深圳远征技术有限公司 | Grounding resistance analyzing device and grounding resistance analyzing method |
| CN104360164A (en) * | 2014-12-13 | 2015-02-18 | 太原理工大学 | Device and method for testing impedance of soil mass under different temperature paths |
| CN105652093A (en) * | 2015-12-30 | 2016-06-08 | 国家电网公司 | Grounding device impact grounding impedance test method |
| CN107328820A (en) * | 2017-06-23 | 2017-11-07 | 南方电网科学研究院有限责任公司 | Research method and device of direct current grounding electrode |
| CN108008198A (en) * | 2017-12-01 | 2018-05-08 | 广东电网有限责任公司佛山供电局 | A kind of impulse earthed resistance measuring method of meter and earth mat temperature |
-
2018
- 2018-08-13 CN CN201810912694.4A patent/CN109187653B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004184384A (en) * | 2002-12-02 | 2004-07-02 | Sankosha Corp | Lightning current measuring method |
| CN102866301A (en) * | 2012-09-18 | 2013-01-09 | 深圳远征技术有限公司 | Grounding resistance analyzing device and grounding resistance analyzing method |
| CN104360164A (en) * | 2014-12-13 | 2015-02-18 | 太原理工大学 | Device and method for testing impedance of soil mass under different temperature paths |
| CN105652093A (en) * | 2015-12-30 | 2016-06-08 | 国家电网公司 | Grounding device impact grounding impedance test method |
| CN107328820A (en) * | 2017-06-23 | 2017-11-07 | 南方电网科学研究院有限责任公司 | Research method and device of direct current grounding electrode |
| CN108008198A (en) * | 2017-12-01 | 2018-05-08 | 广东电网有限责任公司佛山供电局 | A kind of impulse earthed resistance measuring method of meter and earth mat temperature |
Non-Patent Citations (1)
| Title |
|---|
| 吴广宁等: "铁路贯通地线雷击瞬态土壤散流及电位分布的计算", 《高电压技术》 * |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021043024A1 (en) * | 2019-09-05 | 2021-03-11 | 国网内蒙古东部电力有限公司检修分公司 | Ground electrode environment and ground current measurement platform based on mixed soil model |
| AU2020286252B2 (en) * | 2019-09-05 | 2022-06-30 | Chongqing University | Multi-soil model-based device for monitoring environment of grounding electrode and measuring ground current |
| CN111948482A (en) * | 2020-08-24 | 2020-11-17 | 西南交通大学 | Grounding electrode frequency sensitivity characteristic test evaluation method considering temperature and soil type |
| CN111985109A (en) * | 2020-08-24 | 2020-11-24 | 西南交通大学 | Lightning protection effective size coefficient evaluation method for horizontal grounding body at different temperatures |
| CN111948482B (en) * | 2020-08-24 | 2021-06-29 | 西南交通大学 | Grounding electrode frequency sensitivity characteristic test evaluation method considering temperature and soil type |
| 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 |
| CN112305018A (en) * | 2020-09-29 | 2021-02-02 | 广东电网有限责任公司 | True simulation detection device for heat dissipation effect of low-thermal-resistance cable filling medium |
| CN112526302A (en) * | 2020-11-30 | 2021-03-19 | 广东电网有限责任公司佛山供电局 | Line overshoot tolerance characteristic test platform and evaluation method under multi-environment factors |
| CN112526302B (en) * | 2020-11-30 | 2022-01-21 | 广东电网有限责任公司佛山供电局 | Line overshoot tolerance characteristic test platform and evaluation method under multi-environment factors |
| CN115655374A (en) * | 2022-11-07 | 2023-01-31 | 中国矿业大学 | Cable fault detection system and method based on temperature error correction function |
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