CN112540236A - Method and device for shielding corridor electric field exceeding low potential of overhead transmission line - Google Patents
Method and device for shielding corridor electric field exceeding low potential of overhead transmission line Download PDFInfo
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- CN112540236A CN112540236A CN202011313955.4A CN202011313955A CN112540236A CN 112540236 A CN112540236 A CN 112540236A CN 202011313955 A CN202011313955 A CN 202011313955A CN 112540236 A CN112540236 A CN 112540236A
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 75
- 230000005684 electric field Effects 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000002689 soil Substances 0.000 claims description 20
- 239000004020 conductor Substances 0.000 claims description 19
- 238000001514 detection method Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 239000003518 caustics Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 244000144972 livestock Species 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 244000144977 poultry Species 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0807—Measuring electromagnetic field characteristics characterised by the application
- G01R29/0814—Field measurements related to measuring influence on or from apparatus, components or humans, e.g. in ESD, EMI, EMC, EMP testing, measuring radiation leakage; detecting presence of micro- or radiowave emitters; dosimetry; testing shielding; measurements related to lightning
- G01R29/0835—Testing shielding, e.g. for efficiency
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Abstract
The invention discloses an over-standard low potential shielding method and device for an electric field of an overhead transmission line corridor, wherein the over-standard position is determined through the ground electric field intensity, so that a shielding treatment area is determined, the shielding treatment area is used as a central area, and a square shielding body earth screen with the side length not less than 2 times of the distance between phase leads at two sides of the overhead transmission line is selected for laying the earth screen, so that the distribution distortion of the electric field lines of the corridor is changed, the shielding safety is improved, and the space of the electric transmission line corridor is saved.
Description
Technical Field
The invention relates to the technical field of shielding of an electric field of an overhead transmission line corridor, in particular to a method and a device for shielding an electric field of the overhead transmission line corridor from exceeding a low potential.
Background
With the improvement of public environmental awareness, people pay more attention to the influence of the power frequency electric field intensity of the overhead transmission line year by year. Electromagnetic environment control limits (GB8702-2014) stipulate: the public exposure limit of the electric field intensity is that when the frequency is 0.025 kHz-1.2 kHz, E is 200/f (frequency) V/m, for an overhead transmission line, the frequency is 50Hz, the limit value is 4kV/m, meanwhile, the electric field intensity control limit value of the frequency 50Hz of the electric field intensity is 10kV/m, and the electric field intensity control limit value of the electric field intensity is regulated to meet the requirements of places such as cultivated land, garden land, pasture, livestock and poultry raising land, culture water surface and road under the overhead transmission line.
In the existing design rule of the 110kV-1000kV overhead transmission line, the distance between the overhead transmission line and a ground corridor is estimated according to the ground potential on the surface of a ground object, and the local resistivity difference of the ground object and soil is not considered, so that the local electric field intensity on the ground exceeds the public exposure limit of 4kV/m, the electric field intensity environment is not evaluated qualified after the construction of the overhead transmission line is completed, the treatment work of an overproof electric field is required to be carried out, and the completion acceptance of a project can be completed after the treatment is qualified. The existing method for treating the overproof electric field comprises the following steps: the electric field high potential shielding of the overhead transmission line corridor is adopted, but the method has large induced voltage and induced current, has large potential safety hazard, and additionally occupies the space of the overhead transmission line corridor.
Disclosure of Invention
The invention aims to solve the technical problems that the existing standard-exceeding electric field control method has large induced voltage and induced current, has large potential safety hazard and additionally occupies the space of an overhead transmission line corridor, so that the invention provides the standard-exceeding low-potential shielding method and the standard-exceeding low-potential shielding device for the electric field of the overhead transmission line corridor, so as to improve the shielding safety and save the space of the transmission line corridor.
The invention is realized by the following technical scheme:
a method for shielding an electric field of an overhead transmission line corridor from exceeding low potential comprises the following steps:
acquiring the ground electric field intensity of each measuring point of an overhead transmission line corridor and the distance between two side phase conductors of the overhead transmission line;
taking the position of a measuring point of which the ground electric field strength exceeds a preset strength value as an overproof position;
carrying out resistivity detection on the soil at the overproof position, and determining a soil area corresponding to the minimum resistivity as a shielding treatment area;
and selecting a shielding body ground net by taking the shielding treatment area as a central area and according to the distance between the phase conductors on two sides of the overhead transmission line so as to finish the laying of the shielding body ground net.
Furthermore, the mesh of the shielding body ground net is square, and the side length is more than 0 and less than or equal to 0.5 m.
Further, the shielding body ground net is square.
Further, the side length of the square is not less than 2 times of the distance between the phase conductors on the two sides of the overhead transmission line.
Further, the material of the shielding grounding net is a conductive material.
Further, the depth of the ground net laying is not more than 0.5 m.
Further, the overhead transmission line is an overhead transmission line with 110kV, 220kV, 330kV, 500kV, 750kV or 1000kV alternating-current voltage level; alternatively, the first and second electrodes may be,
the overhead transmission line is a 500kV or 800kV direct-current voltage level overhead transmission line.
The utility model provides an overhead transmission line corridor electric field low potential shield assembly that exceeds standard, includes:
the data acquisition module is used for acquiring the ground electric field intensity of each measuring point of the corridor of the overhead transmission line and the distance between two side phase conductors of the overhead transmission line;
the overproof position determining module is used for taking the position of the measuring point of the ground electric field intensity exceeding the preset intensity value as an overproof position;
the shielding treatment area determining module is used for carrying out resistivity detection on the soil at the overproof position and determining the soil area corresponding to the minimum resistivity as a shielding treatment area;
and the shielding body ground net selection module is used for selecting the shielding body ground net by taking the shielding treatment area as a central area and according to the distance between the phase conductors on the two sides of the overhead transmission line so as to finish the laying of the shielding body ground net.
According to the method and the device for shielding the electric field of the corridor of the overhead transmission line from the standard-exceeding low potential, the standard-exceeding position is determined through the ground electric field intensity, so that a shielding treatment area is determined, the shielding treatment area is used as a central area, and a square shielding body ground net with the side length not less than 2 times of the distance between two side phase wires of the overhead transmission line is selected for laying the ground net, so that the distribution distortion of the electric field lines of the corridor is changed, the shielding safety is improved, and the space of the corridor of the transmission line is saved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is an application scene diagram of the over-standard low-potential shielding method for the electric field of the corridor of the overhead transmission line.
Fig. 2 is a flow chart of a low potential shielding method for exceeding electric field of an overhead transmission line corridor.
Fig. 3 is a diagram of a distribution of corridor electric field lines with a uniform soil resistivity distribution according to an embodiment of the present invention.
Fig. 4 is a diagram of a corridor electric field line distribution with non-uniform soil resistivity distribution according to an embodiment of the present invention.
Figure 5 is a graph of the distribution of field lines in a corridor of soil resistivity after the installation of a shield counterpoise in accordance with an embodiment of the present invention.
Fig. 6 is a schematic block diagram of a low potential shielding device for an electric field exceeding an electric field in a corridor of an overhead transmission line.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
The shielding method for the electric field exceeding the standard of the corridor of the overhead transmission line and the low potential provided by the invention is applied to the application scene shown in figure 1. Wherein D represents the distance between two side phase conductors of the overhead transmission line.
Example 1
The invention provides a low-potential shielding method for an electric field exceeding standard of an overhead transmission line corridor, which specifically comprises the following steps as shown in figure 2:
s10: and acquiring the ground electric field intensity of each measuring point of the corridor of the overhead transmission line and the distance between two sides of phase conductors of the overhead transmission line.
S20: and taking the position of the measuring point of which the ground electric field strength exceeds the preset strength value as an overproof position.
The preset intensity value refers to a preset public exposure control limit value of the electromagnetic environment, and the preset intensity value of the embodiment is set to be 4 kV/m.
S30: and (4) carrying out resistivity detection on the soil at the overproof position, and determining the soil area corresponding to the minimum resistivity as a shielding treatment area.
S40: and selecting a shielding body ground net according to the distance between the phase conductors on the two sides of the overhead transmission line by taking the shielding treatment area as a central area so as to finish the laying of the shielding body ground net.
Further, the mesh of the shield counterpoise may be arranged as a square, rectangle or circle. But the circular shape is inconvenient for construction; the length of the rectangle is larger than the width, which wastes material. Therefore, this embodiment uses square meshes, with the side length greater than 0 and equal to or less than 0.5 m.
Further, the shield counterpoise is square.
Further, the side length of the square is not less than 2 times of the distance between the phase conductors on the two sides of the overhead transmission line.
Further, the material of the shield counterpoise is conductive material, and due to the underground corrosive substance, the shield counterpoise of the embodiment is made of stainless steel material in order to avoid corrosion and from the economical point of view.
Further, the depth of the ground net laying is not more than 0.5 m.
Further, the overhead transmission line is an overhead transmission line with 110kV, 220kV, 330kV, 500kV, 750kV or 1000kV alternating-current voltage level. Or the overhead transmission line is a 500kV or 800kV direct-current voltage level overhead transmission line.
Specifically, when the soil resistivity distribution of the overhead transmission line corridor is uniform, the corridor electric field line distribution is uniform and undistorted as shown in fig. 3; when the soil in the corridor of the overhead transmission line contains metal, coal mine and other substances and the resistivity of the soil is not uniformly distributed, the distribution of electric field lines in the corridor is shown in figure 4, the distribution of the electric field lines on the surface of the soil with small resistivity is distorted, and the electric field strength exceeds the preset strength value. By the overhead transmission line corridor electric field standard exceeding low potential shielding method, the stainless steel square shielding body ground net with the depth not more than 0.5m, the mesh size not more than 0.5m and the side length not less than 2 times of the distance between the two side phase wires of the overhead transmission line is paved, so that distorted electric field lines are uniformly distributed. The distribution of the electric field lines in the corridor after the shield ground net is laid is shown in fig. 5, and it can be seen from fig. 5 that the distribution of the electric field lines in the corridor after the shield ground net is laid is uniform.
Example 2
As shown in fig. 6, the present embodiment is different from embodiment 1 in that a low potential shielding device for an electric field exceeding an electric field of an overhead transmission line corridor is provided, and includes:
and the data acquisition module 10 is used for acquiring the ground electric field intensity of each measurement point of the corridor of the overhead transmission line and the distance between two side phase conductors of the overhead transmission line.
And the overproof position determining module 20 is used for taking the position of the measuring point of which the ground electric field strength exceeds the preset strength value as an overproof position.
And the shielding treatment area determining module 30 is used for detecting the resistivity of the soil at the overproof position and determining the soil area corresponding to the minimum resistivity as the shielding treatment area.
And the shielding body ground net selection module 40 is used for selecting the shielding body ground net by taking the shielding treatment area as a central area and according to the distance between the phase conductors on the two sides of the overhead transmission line so as to finish the laying of the shielding body ground net.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. The utility model provides an overhead transmission line corridor electric field low potential shielding method that exceeds standard which characterized in that includes:
acquiring the ground electric field intensity of each measuring point of an overhead transmission line corridor and the distance between two side phase conductors of the overhead transmission line;
taking the position of a measuring point of which the ground electric field strength exceeds a preset strength value as an overproof position;
carrying out resistivity detection on the soil at the overproof position, and determining a soil area corresponding to the minimum resistivity as a shielding treatment area;
and selecting a shielding body ground net by taking the shielding treatment area as a central area and according to the distance between the phase conductors on two sides of the overhead transmission line so as to finish the laying of the shielding body ground net.
2. The overhead transmission line corridor electric field overproof low potential shielding method according to claim 1, wherein meshes of the shielding body ground net are square, and the side length is greater than 0 and less than or equal to 0.5 m.
3. The overhead transmission line corridor electric field overproof low potential shielding method according to claim 1, wherein the shielding body ground mesh is square.
4. The overhead transmission line corridor electric field overproof low potential shielding method according to claim 3, wherein the side length of the square is not less than 2 times of the distance between two side phase conductors of the overhead transmission line.
5. The overhead transmission line corridor electric field overproof low potential shielding method according to any one of claims 1 to 4, wherein the material of the shielding body earth screen is a conductive material.
6. The overhead transmission line corridor electric field overproof low potential shielding method according to claim 1, wherein the depth of the ground screen laying is not more than 0.5 m.
7. The overhead transmission line corridor electric field overproof low potential shielding method according to claim 1, characterized in that the overhead transmission line is an overhead transmission line with 110kV, 220kV, 330kV, 500kV, 750kV or 1000kV alternating voltage class; alternatively, the first and second electrodes may be,
the overhead transmission line is a 500kV or 800kV direct-current voltage level overhead transmission line.
8. The utility model provides an overhead transmission line corridor electric field low potential shield assembly that exceeds standard which characterized in that includes:
the data acquisition module is used for acquiring the ground electric field intensity of each measuring point of the corridor of the overhead transmission line and the distance between two side phase conductors of the overhead transmission line;
the overproof position determining module is used for taking the position of the measuring point of the ground electric field intensity exceeding the preset intensity value as an overproof position;
the shielding treatment area determining module is used for carrying out resistivity detection on the soil at the overproof position and determining the soil area corresponding to the minimum resistivity as a shielding treatment area;
and the shielding body ground net selection module is used for selecting the shielding body ground net by taking the shielding treatment area as a central area and according to the distance between the phase conductors on the two sides of the overhead transmission line so as to finish the laying of the shielding body ground net.
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| CN202011313955.4A CN112540236B (en) | 2020-11-20 | 2020-11-20 | Overhead transmission line corridor electric field standard exceeding low potential shielding method and device |
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| CN202011313955.4A CN112540236B (en) | 2020-11-20 | 2020-11-20 | Overhead transmission line corridor electric field standard exceeding low potential shielding method and device |
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