CN112540236B - Overhead transmission line corridor electric field standard exceeding low potential shielding method and device - Google Patents
Overhead transmission line corridor electric field standard exceeding low potential shielding method and device Download PDFInfo
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- CN112540236B CN112540236B CN202011313955.4A CN202011313955A CN112540236B CN 112540236 B CN112540236 B CN 112540236B CN 202011313955 A CN202011313955 A CN 202011313955A CN 112540236 B CN112540236 B CN 112540236B
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 74
- 230000005684 electric field Effects 0.000 title claims abstract description 56
- 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 17
- 239000000463 material Substances 0.000 claims description 4
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007613 environmental effect Effects 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
- 230000001276 controlling effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000007689 inspection 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
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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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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- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Resistance Or Impedance (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The invention discloses a method and a device for shielding an overhead transmission line corridor electric field with a low potential, wherein the method determines an out-of-standard position through the ground electric field intensity, so as to determine a shielding treatment area, takes the shielding treatment area as a central area, selects a square shielding body ground net with a side length not less than 2 times of the distance between phase wires at two sides of the overhead transmission line to carry out ground net laying, so as to change the distribution distortion of the corridor electric field lines, improve shielding safety and save the space of the transmission line corridor.
Description
Technical Field
The invention relates to the technical field of electric field shielding of overhead transmission line corridor, in particular to a method and a device for shielding an overhead transmission line corridor electric field with an exceeding standard and a low potential.
Background
With the improvement of public environmental awareness, people have been raising attention to the influence of the power frequency electric field intensity of overhead transmission lines year by year. Electromagnetic environmental control Limit value (GB 8702-2014) specifies: e=200/f (frequency) V/m is taken when the public exposure limit of the electric field intensity is 0.025 kHz-1.2 kHz, the limit value is 4kV/m for the overhead transmission line with the frequency of 50Hz, and meanwhile, places such as cultivated land, garden, pasture, livestock and poultry raising land, raising water surface, roads and the like under the overhead transmission line are regulated to be satisfied, and the electric field intensity control limit value of 50Hz is 10kV/m.
In the existing 110kV-1000kV overhead transmission line design regulations, the distance between an overhead transmission line and a ground corridor is estimated according to the ground object surface as the ground potential, and the local resistivity difference of the ground object and soil is not considered, so that the local electric field intensity of the ground exceeds the public exposure limit of 4kV/m, the electric field intensity environment evaluation after the construction completion of the overhead transmission line is unqualified, the exceeding electric field treatment work is required to be carried out, and the project completion acceptance inspection can be completed after the treatment is qualified. The current method for treating the exceeding electric field comprises the following steps: the high-potential shielding of the electric field of the overhead transmission line corridor is adopted, but the method has larger induced voltage and induced current, has larger potential safety hazard, and simultaneously occupies the space of the overhead transmission line corridor additionally.
Disclosure of Invention
The invention aims to solve the technical problems that the existing method for controlling the exceeding electric field has larger induced voltage and induced current, has larger potential safety hazard and additionally occupies the space of an overhead transmission line corridor, so the invention provides the method and the device for shielding the exceeding electric field with low potential of the overhead transmission line corridor, which are used for improving shielding safety and saving the space of the transmission line corridor.
The invention is realized by the following technical scheme:
a method for shielding overhead transmission line corridor electric field 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 phase conductors on two sides of the overhead transmission line;
taking the position of a measuring point of which the ground electric field strength exceeds the strength preset value as an exceeding position;
detecting the resistivity of the soil at the exceeding position, and determining a soil area corresponding to the minimum resistivity as a shielding treatment area;
and selecting the shielding body grounding grid by taking the shielding treatment area as a central area according to the distances of the phase conductors at two sides of the overhead transmission line so as to finish the laying of the shielding body grounding grid.
Further, the mesh of the shielding body ground net is square, and the side length is more than 0 and less than or equal to 0.5m.
Further, the shielding body ground screen is square.
Further, the side length of the square is not smaller than 2 times of the distance between two side phase conductors of the overhead transmission line.
Further, the material of the shielding body grounding grid is conductive material.
Further, the ground screen is laid to a depth of not more than 0.5 meter.
Further, the overhead transmission line is an overhead transmission line with 110kV, 220kV, 330kV, 500kV, 750kV or 1000kV alternating-current voltage class; or,
the overhead transmission line is a 500kV or 800kV direct-current voltage class overhead transmission line.
An overhead transmission line corridor electric field superscalar low potential shielding device, comprising:
the data acquisition module is used for acquiring the ground electric field intensity of each measuring point of the overhead transmission line corridor and the distances between phase conductors on two sides of the overhead transmission line;
the exceeding position determining module is used for taking the position of the measuring point of which the ground electric field strength exceeds the strength preset value as the exceeding position;
the shielding treatment area determining module is used for detecting the resistivity of the soil at the exceeding position and determining the soil area corresponding to the minimum resistivity as a shielding treatment area;
and the shielding body grounding grid selection module is used for taking the shielding treatment area as a central area, and selecting a shielding body grounding grid according to the distances of phase wires on two sides of the overhead transmission line so as to finish the paving of the shielding body grounding grid.
According to the method and the device for shielding the overhead transmission line corridor electric field with the low potential, the over-standard position is determined through the ground electric field intensity, so that the shielding treatment area is determined, the shielding treatment area is taken as the central area, square shielding body ground grids with the side length not smaller than 2 times of the distance between phase wires on two sides of the overhead transmission line are selected for ground grid paving, the distribution distortion of corridor electric field lines is changed, shielding safety is improved, and the space of the transmission line corridor is saved.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention. In the drawings:
fig. 1 is an application scenario diagram of an overhead transmission line corridor electric field over-standard low potential shielding method.
Fig. 2 is a flow chart of a method for shielding overhead transmission line corridor electric field exceeding low potential.
FIG. 3 is a graph showing electric field lines of a corridor with uniform soil resistivity distribution in accordance with an embodiment of the present invention.
FIG. 4 is a graph showing electric field lines of a corridor with non-uniform soil resistivity distribution in accordance with an embodiment of the present invention.
Fig. 5 is a graph showing electric field lines of a corridor of soil resistivity after laying a shield counterpoise according to an embodiment of the present invention.
Fig. 6 is a schematic block diagram of a low potential shielding device for overhead transmission line corridor electric field exceeding.
Detailed Description
For the purpose of making apparent the objects, technical solutions and advantages of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present invention and the descriptions thereof are for illustrating the present invention only and are not to be construed as limiting the present invention.
The overhead transmission line corridor electric field standard exceeding low potential shielding method provided by the invention is applied to an application scene shown in fig. 1. Wherein D represents the distance between two phase conductors on two sides of the overhead transmission line.
Example 1
The invention provides a method for shielding an overhead transmission line corridor electric field exceeding a low potential, which is shown in fig. 2 and specifically comprises the following steps:
s10: and acquiring the ground electric field intensity of each measuring point of the overhead transmission line corridor and the distances between phase conductors on two sides of the overhead transmission line.
S20: and taking the position of the measuring point of which the ground electric field strength exceeds the strength preset value as an exceeding position.
The preset intensity value refers to a preset public exposure control limit value of the electromagnetic environment, and the preset intensity value in the embodiment is set to be 4kV/m.
S30: and detecting the resistivity of the soil at the exceeding position, and determining the soil area corresponding to the minimum resistivity as a shielding treatment area.
S40: and taking the shielding treatment area as a central area, and selecting a shielding body grounding grid according to the distances of phase conductors on two sides of the overhead transmission line so as to finish the laying of the shielding body grounding grid.
Further, the mesh of the shield counterpoise may be provided as square, rectangular or circular. But is circular, so that the construction is inconvenient; the rectangular length should be larger than the width, wasting material. Thus, the present embodiment employs square mesh openings with a side length of 0 to 0.5m.
Further, the shielding body ground screen is square.
Further, 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.
Further, the shielding body grounding grid is made of conductive materials, and is made of stainless steel materials in order to avoid corrosion due to corrosive substances in the ground and from the economical point of view.
Further, the ground screen is laid to a depth of not more than 0.5m.
Further, the overhead transmission line is an overhead transmission line of 110kV, 220kV, 330kV, 500kV, 750kV or 1000kV alternating-current voltage class. Alternatively, the overhead transmission line is a 500kV or 800kV direct current voltage class overhead transmission line.
Specifically, when the soil resistivity distribution of the overhead transmission line corridor is uniform, the corridor electric field line distribution is uniformly distributed without distortion as shown in fig. 3; when the soil of the corridor of the overhead transmission line contains substances such as metal and coal mine, and the like, and the soil resistivity distribution is uneven, the electric field line distribution of the corridor is shown as a figure 4, the electric field line distribution of the surface of the soil with small resistivity is distorted, and the electric field intensity exceeds the preset intensity value. By the overhead transmission line corridor electric field standard exceeding low potential shielding method, the stainless steel square shielding body ground screen with the depth not exceeding 0.5m, the size of the screen hole not exceeding 0.5m and the side length not smaller than 2 times of the distance between phase wires at two sides of the overhead transmission line is paved, so that distorted electric field lines are uniformly distributed. As shown in fig. 5, the distribution of electric field lines in the corridor after the shield ground screen is laid is uniform as can be seen from fig. 5.
Example 2
As shown in fig. 6, this embodiment is different from embodiment 1 in that a low potential shielding device for overhead transmission line corridor electric field exceeding standard is provided, comprising:
the data acquisition module 10 is used for acquiring the ground electric field intensity of each measuring point of the corridor of the overhead transmission line and the distances between phase conductors on two sides of the overhead transmission line.
The exceeding position determining module 20 is configured to take a position of a measurement point where the ground electric field strength exceeds the strength preset value as the exceeding position.
And the shielding treatment area determining module 30 is used for detecting the resistivity of the soil at the exceeding position and determining the soil area corresponding to the minimum resistivity as the shielding treatment area.
And the shielding body grounding grid selection module 40 is used for taking the shielding treatment area as a central area and selecting a shielding body grounding grid according to the distances of phase wires on two sides of the overhead transmission line so as to finish the paving of the shielding body grounding grid.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (6)
1. The utility model provides an overhead transmission line corridor electric field exceeds standard low potential shielding method which is characterized in that the method comprises the following steps: acquiring the ground electric field intensity of each measuring point of an overhead transmission line corridor and the distance between phase conductors on two sides of the overhead transmission line;
taking the position of a measuring point of which the ground electric field strength exceeds the strength preset value as an exceeding position;
detecting the resistivity of the soil at the exceeding position, and determining a soil area corresponding to the minimum resistivity as a shielding treatment area;
selecting a shielding body grounding grid by taking the shielding treatment area as a central area according to the distances of phase conductors on two sides of the overhead transmission line so as to finish the laying of the shielding body grounding grid;
the shielding body ground screen is square;
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.
2. The method for shielding the overhead transmission line corridor electric field exceeding low potential according to claim 1, wherein the mesh of the shielding body ground net is square, and the side length is more than 0 and less than or equal to 0.5m.
3. The method for shielding an overhead transmission line corridor electric field exceeding low potential according to any one of claims 1 to 2, wherein the material of the shielding body ground screen is a conductive material.
4. The overhead transmission line corridor electric field overstandard low potential shielding method of claim 1, wherein the depth of the ground grid laying is not more than 0.5 meters.
5. The overhead transmission line corridor electric field superscalar low potential shielding method of claim 1, wherein the overhead transmission line is an overhead transmission line of 110kV, 220kV, 330kV, 500kV, 750kV or 1000kV ac voltage class; or the overhead transmission line is a 500kV or 800kV direct-current voltage class overhead transmission line.
6. An overhead transmission line corridor electric field standard exceeding low potential shielding device, which is characterized by comprising:
the data acquisition module is used for acquiring the ground electric field intensity of each measuring point of the overhead transmission line corridor and the distances between phase conductors on two sides of the overhead transmission line;
the exceeding position determining module is used for taking the position of the measuring point of which the ground electric field strength exceeds the strength preset value as the exceeding position;
the shielding treatment area determining module is used for detecting the resistivity of the soil at the exceeding position and determining the soil area corresponding to the minimum resistivity as a shielding treatment area;
the shielding body grounding grid selection module is used for taking the shielding treatment area as a central area, and selecting a shielding body grounding grid according to the distances of phase wires on two sides of the overhead transmission line so as to finish the paving of the shielding body grounding grid;
the shielding body ground screen is square;
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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| CN112540236B true CN112540236B (en) | 2024-04-02 |
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