CN118169184A - Method for evaluating grounding stability of concrete poles of distribution network under different soil water contents - Google Patents
Method for evaluating grounding stability of concrete poles of distribution network under different soil water contents Download PDFInfo
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- CN118169184A CN118169184A CN202410280195.3A CN202410280195A CN118169184A CN 118169184 A CN118169184 A CN 118169184A CN 202410280195 A CN202410280195 A CN 202410280195A CN 118169184 A CN118169184 A CN 118169184A
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- 239000002689 soil Substances 0.000 title claims abstract description 73
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 38
- 239000004567 concrete Substances 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000011150 reinforced concrete Substances 0.000 claims abstract description 27
- 239000002184 metal Substances 0.000 claims abstract description 19
- 238000011156 evaluation Methods 0.000 claims abstract description 16
- 239000004576 sand Substances 0.000 claims abstract description 8
- 238000012360 testing method Methods 0.000 claims description 22
- 238000004891 communication Methods 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000013112 stability test Methods 0.000 description 2
- 206010063385 Intellectualisation Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000013097 stability assessment Methods 0.000 description 1
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Abstract
The invention discloses a method for evaluating the grounding stability of a distribution network concrete pole under different soil water contents, which belongs to the technical field of intelligent distribution network line protection and mainly comprises a signal control and recording module, a current generator, a reinforced concrete pole, a soil water content sensor, a hemispherical metal shell, sand, a connecting wire, a grounding module and the like. The experimental platform constructed by the invention can consider the influence of the soil moisture content on the stability of the distribution network grounding system, can acquire the evaluation factor of the grounding stability of the distribution network concrete pole based on different soil moisture contents, and provides scientific reference for improving the running stability and reliability of the distribution network circuit.
Description
Technical Field
The invention belongs to the technical field of intelligent distribution network line protection, and particularly relates to a distribution network concrete pole grounding stability assessment method under different soil water contents.
Background
Under the large environment of continuous deep implementation of a double-carbon strategy, the construction of a novel power system is also performed well, the total capacity of 10 kilovolt users in China reaches 41.34 hundred million kilovolts ampere in 2020, the same ratio is increased by 10.98%, the total length of a 10 kilovolt overhead line is 437.08 ten thousand kilometers, the same ratio is increased by about 9%, and nationwide distribution network lines can increasingly cover areas such as schools, towns and streets, so that greater challenges and requirements are provided for the intellectualization and power supply reliability of the distribution network lines. The distribution network is generally weaker than the main network, the stability of the distribution network grounding system is an important index for guaranteeing the safe and reliable operation of the distribution network line, the soil resistivity is an important factor for influencing the stability of the distribution network grounding system, and when the distribution network is influenced by seasons, weather and other factors, the change of the soil water content can be caused, so that the stability of the grounding system is influenced, the research on the distribution network grounding system is mainly focused on the grounding device, and the influence of the change of the soil water content on the stability of the distribution network grounding system is lacked. In order to more comprehensively analyze the stability and reliability of the intelligent distribution network system, the evaluation method of the grounding stability of the distribution network concrete pole under different soil water contents needs to be researched, and theoretical support can be provided for the analysis of the distribution network line reliability under the consideration of complex environments.
CN114152727B discloses a method for evaluating the soil risk of a grounding grid in consideration of water content, the scheme aims at evaluating the impact characteristics of the grounding grid under high-amplitude direct current, and the scheme proposes a factor for evaluating the soil risk of the grounding grid, so that the prior art does not provide an effective risk evaluation for the power frequency grounding stability of a concrete pole of a distribution network.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a method for evaluating the grounding stability of a distribution network concrete pole under different soil water contents.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
Firstly, building a distribution network concrete pole grounding stability evaluation test platform, wherein the platform comprises a signal control and recording module, a first connecting wire, a current generator, a second connecting wire, a reinforced concrete pole, a first soil moisture sensor, a second soil moisture sensor, a third soil moisture sensor, a fourth soil moisture sensor, a hemispherical metal shell, sand, a third connecting wire and a grounding module;
The signal control and recording module comprises a control unit and has a data recording function, the current generator is electrically connected with the signal control and recording module through a first connecting wire, and the reinforced concrete electric pole is electrically connected with the current generator through a second connecting wire;
The hemispherical metal shell is filled with sand, a part of the reinforced concrete pole buried in the ground is perpendicular to the sand, and the first soil moisture content sensor, the second soil moisture content sensor, the third soil moisture content sensor and the fourth soil moisture content sensor are respectively coated in the soil around the reinforced concrete pole and have a data wireless transmission function, and the hemispherical metal shell is electrically connected with the grounding module through a third connecting wire;
secondly, carrying out a test of the grounding stability of the concrete pole of the distribution network under different soil water contents:
Measuring and recording the embedded depth of the reinforced concrete pole before testing, testing the water content of the soil around the reinforced concrete pole by using a soil water content sensor, transmitting the water content to a signal control and recording module, controlling a current generator to perform grounding stability test on the reinforced concrete pole by using the signal control and recording module, and after the test is finished, replacing the soil in the semi-spherical metal shell and filling the soil with different water contents for testing, wherein the soil resistivity is controlled within the range of 100 omega-m to 500 omega-m;
thirdly, acquiring a distribution network concrete pole grounding stability evaluation factor E under different soil water contents:
Wherein M is the depth of the reinforced concrete pole in the buried ground, d is the equivalent diameter of the part of the reinforced concrete pole in the buried ground, and W sj is the soil water content under the jth test; when E is E (0, 15), the distribution network line is characterized to meet the stability requirement of the relay protection action, when And during the process, the lightning protection grounding performance of the distribution network line is unstable, and the grounding stability performance needs to be improved in time.
The method provided by the invention can effectively evaluate the grounding stability of the distribution network concrete pole under different soil moisture contents, and provides scientific reference for improving the reliability of the distribution network circuit.
Compared with the prior art, the invention has the beneficial effects that:
1) The experimental platform constructed by the invention can consider the influence of the soil moisture content on the stability of the distribution network grounding system, and has reliability;
2) The evaluation method can acquire the evaluation factors of the grounding stability of the distribution network concrete pole based on different soil water contents, and can evaluate the stability.
Drawings
Fig. 1 is a schematic diagram of the overall structure of a test platform for evaluating the grounding stability of a concrete pole of a distribution network when the test platform is used.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As can be seen from fig. 1, the experimental platform and method provided by the present invention include the following steps:
The first step: establishing a distribution network concrete pole grounding stability evaluation test platform, wherein the platform comprises: the signal control and recording module 1, the signal control and recording module 1 is connected with the current generator 3 through the first connecting wire 2, the current generator 3 is connected with the reinforced concrete pole 5 through the second connecting wire 4, the reinforced concrete pole 5 is inserted into the hemispherical metal shell 10, the hemispherical metal shell 10 is internally provided with sand 11, the hemispherical metal shell 10 is internally provided with a first soil moisture sensor 6, a second soil moisture sensor 7, a third soil moisture sensor 8 and a fourth soil moisture sensor 9, and the hemispherical metal shell 10 is connected with the grounding module 13 through the third connecting wire 12.
The signal control and recording module 1 includes a control unit and has a data recording function, the current generator 3 is electrically connected with the signal control and recording module 1 through a first connecting wire 2, and the reinforced concrete pole 5 is electrically connected with the current generator 3 through a second connecting wire 4.
The experimental platform constructed in the evaluation method adopts the hemispherical metal shell 10 to simulate the earth, and the obtained evaluation result is more true and reliable. The hemispherical metal shell 10 is filled with sand 11, a part of the reinforced concrete pole 5 buried in the ground is perpendicular to the sand 11, and the first soil moisture content sensor 6, the second soil moisture content sensor 7, the third soil moisture content sensor 8 and the fourth soil moisture content sensor 9 are respectively laid in the soil around the reinforced concrete pole 5 and have a data wireless transmission function, so that each soil moisture content sensor is in communication connection with the signal control and recording module 1; the hemispherical metal shell 10 is electrically connected to the grounding module 13 through a third connection wire 12.
Secondly, carrying out a test of the grounding stability of the concrete pole of the distribution network under different soil water contents:
before the test, the embedded depth of the reinforced concrete pole 5 is measured and recorded, the water content of the soil around the reinforced concrete pole 5 is tested by using a soil water content sensor and is transmitted to the signal control and recording module 1, the recorded water content of the soil is the arithmetic average value of the measured data of all the soil water content sensors, the ground stability test is carried out on the reinforced concrete pole 5 by controlling the current generator 3 through the signal control and recording module 1, the soil in the semi-spherical metal shell 10 is replaced and filled with the soil with different water contents after the test is finished, and the soil resistivity is controlled within the range of 100 omega-m to 500 omega-m.
Thirdly, acquiring a distribution network concrete pole grounding stability evaluation factor E under different soil water contents:
Wherein M is the depth of the reinforced concrete pole 5 in the buried ground, d is the equivalent diameter of the part of the reinforced concrete pole 5 in the buried ground, and W sj is the soil water content under the j-th test;
when E is E (0, 15), the distribution network line is characterized to meet the stability requirement of the relay protection action, when And during the process, the lightning protection grounding performance of the distribution network line is unstable, and the grounding stability performance needs to be improved in time.
According to the method, the evaluation factor is deduced based on the grounding characteristic of the distribution network concrete pole under the power frequency alternating current, and the calculation formula of the evaluation factor is deduced based on the theoretical calculation formula of the distribution network concrete pole tower grounding resistance and the experimental data fitting calculation formula of the relation between the soil water content and the resistivity, so that the evaluation result has good reliability.
Claims (2)
1. The method for evaluating the grounding stability of the concrete pole of the distribution network under different soil water contents is characterized by comprising the following steps:
The first step: establishing a distribution network concrete pole grounding stability evaluation test platform, wherein the platform comprises: the signal control and recording module (1), the signal control and recording module (1) is connected with the current generator (3) through a first connecting wire (2), the current generator (3) is connected with the reinforced concrete electric pole (5) through a second connecting wire (4), the reinforced concrete electric pole (5) is inserted into the hemispherical metal shell (10), sand (11) is filled in the hemispherical metal shell (10), at least two soil moisture sensors are arranged in the hemispherical metal shell (10), each soil moisture sensor is in communication connection with the signal control and recording module (1), and the other end of the hemispherical metal shell (10) is grounded;
secondly, carrying out a test of the grounding stability of the concrete pole of the distribution network under different soil water contents:
Measuring and recording the embedded depth of the reinforced concrete pole (5) before testing, testing the water content of the soil around the reinforced concrete pole (5) by using a soil water content sensor, transmitting the water content to a signal control and recording module (1), controlling a current generator (3) to test the grounding stability of the reinforced concrete pole (5) by using the signal control and recording module (1) when the recorded water content of the soil is the arithmetic average value of the measured data of all the soil water content sensors, and replacing the soil in the hemispherical metal shell (10) and filling the soil with different water contents for testing after the test is finished, wherein the soil resistivity is controlled within the range of 100 omega-m to 500 omega-m;
thirdly, acquiring a distribution network concrete pole grounding stability evaluation factor E under different soil water contents:
Wherein M is the depth of the reinforced concrete pole (5) in the buried ground, d is the equivalent diameter of the part of the reinforced concrete pole (5) in the buried ground, and W sj is the soil water content under the jth test;
when E is E (0, 15), the distribution network line is characterized to meet the stability requirement of the relay protection action, when And during the process, the lightning protection grounding performance of the distribution network line is unstable, and the grounding stability performance needs to be improved in time.
2. The method for evaluating the grounding stability of the concrete poles of the distribution network under different soil water contents according to claim 1, wherein the method comprises the following steps: a first soil moisture sensor (6), a second soil moisture sensor (7), a third soil moisture sensor (8) and a fourth soil moisture sensor (9) are arranged in the hemispherical metal shell (10).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410280195.3A CN118169184A (en) | 2024-03-12 | 2024-03-12 | Method for evaluating grounding stability of concrete poles of distribution network under different soil water contents |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410280195.3A CN118169184A (en) | 2024-03-12 | 2024-03-12 | Method for evaluating grounding stability of concrete poles of distribution network under different soil water contents |
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- 2024-03-12 CN CN202410280195.3A patent/CN118169184A/en active Pending
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