Cable auxiliary selection method and device based on cable shielding field intensity

Abstract

The invention provides a cable auxiliary selection method and device based on cable shielding field intensity, and relates to the technical field of cable selection, and the method comprises the steps: carrying out the cable laying path planning based on an inspection result; calculating earth surface field intensity interference factors of various factors of each section of basic path every day based on various environment detection data of each section of basic path every day, and selecting earth surface extreme value field intensity interference factors of various factors of each section of basic path; obtaining an underground comprehensive electromagnetic field influence factor based on the cable laying parameters of each section of basic path, and constructing an interference evaluation matrix based on the underground comprehensive electromagnetic field influence factor of each section of basic path and the earth surface extreme value field intensity interference factor of each type of factors of each section of basic path; and selecting the cable based on the interference evaluation matrix. When the cable is selected, field investigation is carried out, interference of ground and underground factors in an actual laying environment on the cable is comprehensively considered, and compared with an existing method, the method is more comprehensive, accurate, reliable and intelligent.

Description

Technical Field

[0001] The invention belongs to the technical field of cable selection, and in particular relates to a cable auxiliary selection method and device based on cable shielding field strength. Background Art

[0002] As an important component of power transmission and signal transmission, cables are widely used in various fields. Selecting the right cable is crucial to ensuring the stability of the power system, the accuracy of signal transmission, and the safe operation of equipment. The choice of cable directly affects the power quality, system reliability, and work efficiency.

[0003] The existing cable selection methods generally include the following, each of which has the following disadvantages:

[0004] Based on experience: Cable selection based on experience and rules generally lacks accurate scientific basis, is easily affected by subjective factors, and the selection results are unreliable;

[0005] Based on signal transmission performance method: The cable is selected by analyzing the performance indicators such as signal transmission attenuation and distortion. The disadvantage is that it only considers the signal transmission characteristics and ignores the impact of external interference on the cable.

[0006] Economic-based method: Cables are selected based on economic factors such as cable cost and service life. The disadvantage is that the impact of external interference on cable stability and reliability is not taken into account. Summary of the invention

[0007] The present invention provides a cable auxiliary selection method and device based on cable shielding field strength, which are used to solve at least one of the technical problems mentioned above.

[0008] In order to solve the above technical problems, the present invention discloses a cable auxiliary selection method based on cable shielding field strength, comprising the following steps:

[0009] S1. Conduct a field survey of the construction environment for laying cables, and plan the cable laying path based on the survey results to obtain the cable laying planning path and cable laying parameters designed based on the cable laying path;

[0010] S2. Divide the planned cable laying path into a number of basic paths of equal length, perform basic path environmental detection on each basic path for a preset number of days through a cable auxiliary selection device, and obtain various environmental detection data of each basic path every day;

[0011] S3. Calculate the surface field strength interference factors of various factors of each basic path every day based on various environmental detection data of each basic path every day, select the maximum value of the surface field strength interference factors of various factors within a preset number of days for each basic path based on the surface field strength interference factors of various factors every day, and use it as the surface extreme field strength interference factor of various factors for each basic path;

[0012] S4. Obtain the underground comprehensive electromagnetic field influence factor based on the cable laying parameters of each basic path, construct an interference assessment matrix based on the underground comprehensive electromagnetic field influence factor of each basic path and the surface extreme field strength interference factor of each type of factor of each basic path, and obtain the external interference assessment result of the cable based on the interference assessment matrix;

[0013] S5. Select cables based on the external interference evaluation results of the cables.

[0014] Preferably, step S1 comprises:

[0015] S11, demarcating the area to be inspected based on the starting end of the cable laying, and determining the shooting route of the drone based on the area to be inspected;

[0016] S12. Obtain basic remote sensing images of the area to be investigated based on the shooting route of the UAV;

[0017] S13, determining the area to be supplemented based on the clarity and completeness of the basic remote sensing image, and determining the route for supplementary acquisition and shooting by the drone based on the area to be supplemented;

[0018] S14, obtaining supplementary remote sensing images of the area to be supplemented based on the supplementary acquisition and shooting route of the UAV;

[0019] S15, obtaining a final remote sensing image of the area to be investigated based on the basic remote sensing image and the supplementary remote sensing image;

[0020] S16. Perform cable laying path planning based on the final remote sensing image of the area to be investigated, and obtain the cable laying planning path and cable laying parameters designed based on the cable laying path.

[0021] Preferably, step S13 includes:

[0022] S130, analyzing the clarity of the basic remote sensing image, and determining a basic remote sensing image area whose clarity does not meet the requirement;

[0023] S131, analyzing the integrity of the basic remote sensing image, and determining the basic remote sensing image area whose integrity does not meet the requirements;

[0024] S132. The basic remote sensing image area whose clarity does not meet the requirement and the basic remote sensing image area whose completeness does not meet the requirement are combined to form an area to be supplemented.

[0025] Preferably, step S15 includes:

[0026] The clarity and integrity of the area in the basic remote sensing image where the clarity or integrity does not meet the requirements are compared with the clarity and integrity of the corresponding coordinates of the supplementary remote sensing image. When the clarity and integrity of the corresponding coordinates of the supplementary remote sensing image are greater than the clarity and integrity of the corresponding coordinates in the basic remote sensing image, the image of the corresponding coordinates in the basic remote sensing image is replaced with the image of the corresponding coordinates in the supplementary remote sensing image to obtain a final remote sensing image.

[0027] When the clarity and integrity of the corresponding coordinates of the supplementary remote sensing image are less than the clarity and integrity of the corresponding coordinates in the basic remote sensing image, remote sensing image acquisition is performed again for the coordinates to form a new supplementary remote sensing image, and then a comparison and replacement is performed.

[0028] Preferably, step S4: obtaining the underground comprehensive electromagnetic field influence factor based on the cable laying parameters of each basic path:

[0029]

[0030] Among them, E n is the underground comprehensive electromagnetic field impact factor of the nth basic path, e is a natural number, and its value is 2.71, T 1n is the soil temperature value of the nth foundation path at the corresponding laying depth, S 1n is the soil moisture value of the nth foundation path at the corresponding laying depth, T 10 is the soil reference temperature at the cable laying location, S 10 is the soil reference humidity value at the cable laying location, H n is the laying depth parameter of the cable of the nth basic path, is the interference coefficient of soil temperature on electromagnetic field, is the interference coefficient of soil moisture on the electromagnetic field, and γ is the shielding coefficient of the unit laying depth of the cable to the external electromagnetic field.

[0031] Preferably, step S3 calculates the surface field strength interference factors of various factors of each basic path every day based on various environmental detection data of each basic path every day, including:

[0032] The daily surface electric field interference factor based on the environmental electric field for the nth basic path is:

[0033] where a j is the detection value of the surface electric field detection unit of the daily cable auxiliary selection device at the nth basic path in the jth detection period, m is the total detection time of the daily cable auxiliary selection device, α 1is the interference intensity coefficient of the unit surface electric field strength on the cable;

[0034] The daily surface magnetic field interference factor based on the ambient magnetic field for the nth basic path is:

[0035] where b j is the detection value of the surface magnetic field detection unit of the daily cable auxiliary selection device at the nth basic path in the jth detection period, α 2 is the interference intensity coefficient of the unit surface magnetic field strength on the cable;

[0036] The daily surface electric field interference factor based on temperature and humidity for the nth basic path is:

[0037] where c Tj is the detection value of the surface temperature detection unit of the daily cable auxiliary selection device at the nth basic path in the jth detection period, e is a natural number with a value of 2.71, c T0 is the surface reference temperature, c Sj is the detection value of the surface humidity detection unit of the daily cable auxiliary selection device at the jth detection period at the nth basic path, c T0 is the surface reference humidity value, C 0 is the surface electric field interference factor of the reference temperature and humidity;

[0038] The daily surface magnetic field interference factor based on temperature and humidity for the nth basic path is:

[0039] D 0 is the surface electric field interference factor of the reference temperature and humidity.

[0040] Preferably, step S4 constructs an interference assessment matrix based on the underground comprehensive electromagnetic field influence factor of each basic path and the surface extreme field intensity interference factor of each type of factor of each basic path, including:

[0041]

[0042] in, is the interference assessment matrix, A 1max is the surface extreme environmental electric field interference factor based on the environmental electric field for the first basic path, A 2max is the surface extreme environmental electric field interference factor based on the environmental electric field for the second basic path, A nmax is the surface extreme environmental electric field interference factor based on the environmental electric field of the nth basic path, B 1max is the surface extreme magnetic field interference factor based on the ambient magnetic field for the first basic path,

[0043] B 2maxis the surface extreme magnetic field interference factor based on the ambient magnetic field for the second basic path, B nmax is the surface extreme magnetic field interference factor based on the ambient magnetic field of the nth basic path, C 1max is the surface extreme electric field interference factor based on temperature and humidity for the first basic path, C 2max is the surface extreme electric field interference factor based on temperature and humidity for the second basic path, C nmax is the surface extreme electric field interference factor based on temperature and humidity of the nth basic path, D 1max is the surface extreme magnetic field interference factor based on temperature and humidity for the first basic path,

[0044] D 2max is the surface extreme magnetic field interference factor based on temperature and humidity for the second basic path, D nmax is the surface extreme magnetic field interference factor based on temperature and humidity for the nth basic path, E 1 is the underground comprehensive electromagnetic field impact factor of the first basic path, E 2 is the underground comprehensive electromagnetic field impact factor of the second basic path, E n is the underground comprehensive electromagnetic field impact factor of the nth basic path.

[0045] Preferably, step S4 of obtaining an external interference evaluation result of the cable based on the interference evaluation matrix includes:

[0046] Step S41, remove the elements of each column in the interference assessment matrix in turn, use the column of the elements removed each time as the middle column, and use the new matrix obtained by each removal as the middle matrix corresponding to the middle column;

[0047] Step S42: Use the middle column corresponding to the middle matrix with the largest rank among all the middle matrices as the evaluation column, and use all elements in the evaluation column as reference elements for cable selection.

[0048] Preferably, step S5 of selecting a cable based on the external interference evaluation result of the cable includes:

[0049] Step S51: Calculate the preset interference electromagnetic field strength of the cable based on the reference elements selected in the interference assessment matrix:

[0050]

[0051] Among them, W x is the preset interference electromagnetic field strength of the cable, W 0 is the reference interference electromagnetic field, exp represents the exponential with e as the base, It is the reference element of underground comprehensive electromagnetic field impact factor selected based on the interference assessment matrix. is the reference element of the ground extreme environmental electric field interference factor based on the environmental electric field selected in the interference assessment matrix, is the reference element of the surface extreme electric field interference factor based on temperature and humidity selected in the interference assessment matrix, is the reference element of the ground extreme magnetic field interference factor based on the environmental magnetic field selected in the interference assessment matrix, is the reference element of the surface extreme magnetic field interference factor based on temperature and humidity selected in the interference assessment matrix, β 1 is the correction coefficient of the electric field interference factor, β 2 is the correction coefficient of magnetic field interference factor;

[0052] Step S52: Based on the preset interference electromagnetic field strength of the cable and formula (8), the thickness of the insulation layer between the inner diameter of the cable insulation shielding layer and the outer diameter of the cable conductor shielding layer is calculated:

[0053]

[0054] Among them, U 0 is the rated voltage of the cable, d is the radius of the cable conductor, Ln is the natural logarithm with e as the base, h 1 is the thickness of the cable conductor shielding layer, Δ is the thickness of the insulation layer between the inner diameter of the cable insulation shielding layer and the outer diameter of the cable conductor shielding layer, To compensate for the electromagnetic field strength;

[0055] Step S53: Calculate the thickness of the insulation outer sheath of the cable based on the reference element selected in the interference assessment matrix:

[0056]

[0057] Among them, h 2 is the thickness of the cable's outer insulation sheath, is the reference underground comprehensive electromagnetic field impact factor selected based on the interference assessment matrix, h 20 The base thickness of the cable's outer insulation sheath;

[0058] Step S54: Select a cable based on the calculated values ​​of steps S52 and S53.

[0059] A cable auxiliary selection device, comprising:

[0060] The path planning module performs cable laying path planning based on the investigation results, obtains the cable laying planning path and the cable laying parameters based on the cable laying path design;

[0061] Detection module, the detection module includes a surface electric field detection unit, a surface magnetic field detection unit, a surface temperature detection unit and a surface humidity detection unit. The detection module is used to obtain various environmental detection data of each basic path every day;

[0062] The surface extreme field intensity interference factor calculation module is used to obtain the surface extreme field intensity interference factors of various factors of each basic path based on the detection results of the detection module;

[0063] The evaluation module constructs an interference evaluation matrix based on the underground comprehensive electromagnetic field influence factor of each basic path and the surface extreme field strength interference factor of each type of factor of each basic path, and obtains the external interference evaluation result of the cable based on the interference evaluation matrix;

[0064] The cable parameter calculation unit is used to calculate the cable parameters based on the external interference evaluation result of the cable, and select the cable based on the calculation result.

[0065] Compared with the prior art, the present invention has the following beneficial effects:

[0066] When selecting cables, the present invention conducts field investigations and comprehensively considers the interference of ground and underground factors on cables in the actual laying environment. Compared with existing methods, it is more comprehensive, accurate, reliable and intelligent, and can provide more scientific and reliable guidance in the cable laying selection process. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0068] Figure 1 It is a schematic diagram of the process of the present invention; DETAILED DESCRIPTION

[0069] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0070] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions and technical features between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0071] The present invention provides the following embodiments

[0072] Example 1

[0073] The embodiment of the present invention provides a cable auxiliary selection method and device based on cable shielding field strength, such as Figure 1 As shown, the following steps are included:

[0074] S1. Conduct a field survey of the construction environment for laying cables, and plan the cable laying path based on the survey results to obtain the cable laying planning path and cable laying parameters designed based on the cable laying path;

[0075] S2. Divide the planned cable laying path into a number of basic paths of equal length, perform basic path environmental detection on each basic path for a preset number of days through a cable auxiliary selection device, and obtain various environmental detection data of each basic path every day;

[0076] S3. Calculate the surface field strength interference factors of various factors of each basic path every day based on various environmental detection data of each basic path every day, select the maximum value of the surface field strength interference factors of various factors within a preset number of days for each basic path based on the surface field strength interference factors of various factors every day, and use it as the surface extreme field strength interference factor of various factors for each basic path;

[0077] S4. Obtain the underground comprehensive electromagnetic field influence factor based on the cable laying parameters of each basic path, construct an interference assessment matrix based on the underground comprehensive electromagnetic field influence factor of each basic path and the surface extreme field strength interference factor of each type of factor of each basic path, and obtain the external interference assessment result of the cable based on the interference assessment matrix;

[0078] S5. Select cables based on the external interference evaluation results of the cables.

[0079] A cable auxiliary selection device, comprising:

[0080] The path planning module performs cable laying path planning based on the investigation results, obtains the cable laying planning path and the cable laying parameters based on the cable laying path design;

[0081] Detection module, the detection module includes a surface electric field detection unit, a surface magnetic field detection unit, a surface temperature detection unit and a surface humidity detection unit. The detection module is used to obtain various environmental detection data of each basic path every day;

[0082] The surface extreme field intensity interference factor calculation module is used to obtain the surface extreme field intensity interference factors of various factors of each basic path based on the detection results of the detection module;

[0083] The evaluation module constructs an interference evaluation matrix based on the underground comprehensive electromagnetic field influence factor of each basic path and the surface extreme field strength interference factor of each type of factor of each basic path, and obtains the external interference evaluation result of the cable based on the interference evaluation matrix;

[0084] The cable parameter calculation unit is used to calculate the cable parameters based on the external interference evaluation result of the cable, and select the cable based on the calculation result.

[0085] In this embodiment, a manually operated drone is used in the field survey to collect remote sensing images of the construction environment where the cable is to be laid.

[0086] In this embodiment, the cable laying path is a cable laying route planned based on remote sensing images collected by the drone.

[0087] In this embodiment, the cable laying parameters based on the cable laying path design include the height and low bending trend of each cable section and the cable laying depth.

[0088] In this embodiment, various environmental detection data of each basic path every day include electric field strength, magnetic field strength, ambient temperature, and ambient humidity.

[0089] In this embodiment, the underground comprehensive electromagnetic field influencing factor is an interference parameter of the cable electromagnetic field based on the temperature, humidity and pH of the underground soil.

[0090] In this embodiment, the surface extreme field strength interference factors of various factors for each basic path include the surface electric field interference factor based on the ambient electric field for each basic path every day, the surface magnetic field interference factor based on the ambient magnetic field for each basic path every day, the surface electric field interference factor based on temperature and humidity for each basic path every day, and the surface magnetic field interference factor based on temperature and humidity for each basic path every day.

[0091] In this embodiment, the surface extreme field strength interference factor of each factor of each basic path is the surface field strength interference factor of each factor of each day, and the maximum value of the surface field strength interference factor of each factor of each basic path within a preset number of days is selected.

[0092] In this embodiment, the interference assessment matrix is ​​a matrix including the underground comprehensive electromagnetic field influence factor of each basic path and the surface extreme field intensity interference factor of each type of factor of each basic path.

[0093] The working principle and beneficial effects of the above technical solution are as follows: when selecting cables, the present invention conducts field investigations and comprehensively considers the interference of ground and underground factors on cables in the actual laying environment. Compared with existing methods, it is more comprehensive, accurate, reliable and intelligent, and can provide more scientific and reliable guidance in the cable laying selection process.

[0094] Example 2

[0095] Based on Example 1, step S1 includes:

[0096] S11, demarcating the area to be inspected based on the starting end of the cable laying, and determining the shooting route of the drone based on the area to be inspected;

[0097] S12. Obtain basic remote sensing images of the area to be investigated based on the shooting route of the UAV;

[0098] S13, determining the area to be supplemented based on the clarity and completeness of the basic remote sensing image, and determining the route for supplementary acquisition and shooting by the drone based on the area to be supplemented;

[0099] S14, obtaining supplementary remote sensing images of the area to be supplemented based on the supplementary acquisition and shooting route of the UAV;

[0100] S15, obtaining a final remote sensing image of the area to be investigated based on the basic remote sensing image and the supplementary remote sensing image;

[0101] S16. Perform cable laying path planning based on the final remote sensing image of the area to be investigated, and obtain the cable laying planning path and cable laying parameters designed based on the cable laying path.

[0102] In this embodiment, the area to be investigated is delineated based on the starting end of the cable laying, that is, the engineer preliminarily circles the path range based on the starting point and end point of the cable laying on the map.

[0103] In this embodiment, the shooting route of the drone is determined based on the area to be investigated by taking points on the edge lines on both sides of the area to be investigated, using the line connecting the points on the two symmetrical edge lines as the baseline, the midpoint of the baseline as the reference point, and the line connecting several reference points as the shooting route of the drone.

[0104] In this embodiment, the basic remote sensing image is a remote sensing image acquired by the drone based on the shooting route of the drone.

[0105] In this embodiment, the area to be supplemented is an image area in the basic remote sensing image whose clarity or completeness does not meet a preset standard.

[0106] In this embodiment, the drone supplementary collection and shooting route is a drone flight route replanned based on the area to be supplemented.

[0107] In this embodiment, the supplementary remote sensing image is a remote sensing image acquired by the drone based on a supplementary acquisition and shooting route of the drone.

[0108] In this embodiment, the final remote sensing image is a collection of remote sensing images with the best clarity and integrity among the remote sensing images acquired by the drone multiple times.

[0109] The working principle and beneficial effects of the above technical solution are as follows: through drone photography and remote sensing image processing, the area to be inspected can be accurately delineated, clear and complete remote sensing images can be obtained, and path planning can be performed based on the images, thereby improving the accuracy and reliability of cable laying path planning.

[0110] Example 3

[0111] Based on Example 2, step S13 includes:

[0112] S130, analyzing the clarity of the basic remote sensing image, and determining a basic remote sensing image area whose clarity does not meet the requirement;

[0113] S131, analyzing the integrity of the basic remote sensing image, and determining the basic remote sensing image area whose integrity does not meet the requirements;

[0114] S132. The basic remote sensing image area whose clarity does not meet the requirement and the basic remote sensing image area whose completeness does not meet the requirement are combined to form an area to be supplemented.

[0115] The working principle and beneficial effects of the above technical solution are: by analyzing the clarity and completeness of the basic remote sensing images and determining the areas to be supplemented, the remote sensing images can be accurately supplemented to improve the integrity and accuracy of the surface environmental data.

[0116] Example 4

[0117] Based on Example 2, step S15 includes:

[0118] The clarity and integrity of the area in the basic remote sensing image where the clarity or integrity does not meet the requirements are compared with the clarity and integrity of the corresponding coordinates of the supplementary remote sensing image. When the clarity and integrity of the corresponding coordinates of the supplementary remote sensing image are greater than the clarity and integrity of the corresponding coordinates in the basic remote sensing image, the image of the corresponding coordinates in the basic remote sensing image is replaced with the image of the corresponding coordinates in the supplementary remote sensing image to obtain a final remote sensing image.

[0119] When the clarity and integrity of the corresponding coordinates of the supplementary remote sensing image are less than the clarity and integrity of the corresponding coordinates in the basic remote sensing image, remote sensing image acquisition is performed again for the coordinates to form a new supplementary remote sensing image, and then a comparison and replacement is performed.

[0120] The working principle and beneficial effects of the above technical solution are as follows: by comparing the clarity and completeness of the supplementary remote sensing image with the basic remote sensing image, an image with higher clarity and completeness can be selected for replacement, which helps to improve the quality of the final remote sensing image, making the details in the image more clearly visible and the information more complete and accurate. By using remote sensing images with higher clarity and completeness, more accurate surface feature information can be obtained, providing more reliable data for the planning of cable laying routes, helping to reduce errors and uncertainties in route planning, and improving the accuracy and reliability of route planning. By comparing and replacing areas in remote sensing images that do not meet the requirements, more reliable and comprehensive environmental information can be obtained, which helps to more accurately evaluate the characteristics and conditions of the cable laying environment, and provide a more scientific and reasonable basis for the selection and arrangement of cables.

[0121] Example 5

[0122] On the basis of Example 1, step S4: obtaining the underground comprehensive electromagnetic field influence factor based on the cable laying parameters of each basic path:

[0123]

[0124] Among them, E n is the underground comprehensive electromagnetic field impact factor of the nth basic path, e is a natural number, and its value is 2.71, T 1n is the soil temperature value of the nth foundation path at the corresponding laying depth, S 1n is the soil moisture value of the nth foundation path at the corresponding laying depth, T 10 is the soil reference temperature at the cable laying location, S 10 is the soil reference humidity value at the cable laying location, H n is the laying depth parameter of the cable of the nth basic path, is the interference coefficient of soil temperature on electromagnetic field, is the interference coefficient of soil moisture on the electromagnetic field, and γ is the shielding coefficient of the unit laying depth of the cable to the external electromagnetic field.

[0125] The working principle and beneficial effects of the above technical solution are as follows: the calculation of the underground comprehensive electromagnetic field influencing factor can obtain the interference of underground soil temperature and humidity, pH and cable laying depth on the electromagnetic field of the cable, providing an evaluation basis for the selection of cables.

[0126] Example 6

[0127] On the basis of Example 1, step S3 calculates the surface field strength interference factors of various factors of each basic path every day based on various environmental detection data of each basic path every day, including:

[0128] The daily surface electric field interference factor based on the environmental electric field for the nth basic path is:

[0129] where a j is the detection value of the surface electric field detection unit of the daily cable auxiliary selection device at the nth basic path in the jth detection period, m is the total detection time of the daily cable auxiliary selection device, α 1 is the interference intensity coefficient of the unit surface electric field strength on the cable;

[0130] The daily surface magnetic field interference factor based on the ambient magnetic field for the nth basic path is:

[0131] where b j is the detection value of the surface magnetic field detection unit of the daily cable auxiliary selection device at the nth basic path in the jth detection period, α 2 is the interference intensity coefficient of the unit surface magnetic field strength on the cable;

[0132] The daily surface electric field interference factor based on temperature and humidity for the nth basic path is:

[0133] where c Tj is the detection value of the surface temperature detection unit of the daily cable auxiliary selection device at the nth basic path in the jth detection period, e is a natural number with a value of 2.71, c T0 is the surface reference temperature, c Sj is the detection value of the surface humidity detection unit of the daily cable auxiliary selection device at the jth detection period at the nth basic path, c T0 is the surface reference humidity value, C 0 is the surface electric field interference factor of the reference temperature and humidity;

[0134] The daily surface magnetic field interference factor based on temperature and humidity for the nth basic path is:

[0135] D 0is the surface electric field interference factor of the reference temperature and humidity.

[0136] In this embodiment, the daily surface electric field interference factor of the nth basic path based on the environmental electric field represents the interference parameter of the electric field in the surrounding environment on the electric field at the nth basic path.

[0137] In this embodiment, the surface magnetic field interference factor of the nth basic path based on the environmental magnetic field every day represents the interference parameter of the magnetic field in the surrounding environment on the magnetic field at the nth basic path.

[0138] In this embodiment, the daily surface electric field interference factor based on temperature and humidity of the nth basic path represents the interference parameter of the ambient temperature and humidity on the electric field at the nth basic path.

[0139] In this embodiment, the daily surface magnetic field interference factor based on temperature and humidity of the nth basic path represents the interference parameters of the ambient temperature and humidity on the magnetic field at the nth basic path.

[0140] The working principle and beneficial effects of the above technical scheme are: by calculating the surface electric field interference factor based on the environmental electric field of the nth basic path every day, the surface magnetic field interference factor based on the environmental magnetic field of the nth basic path every day, the surface electric field interference factor based on temperature and humidity of the nth basic path every day, and the surface magnetic field interference factor based on temperature and humidity of the nth basic path every day, the interference degree of different factors on the cable can be comprehensively considered, which helps to determine the suitability and selection of cable laying, helps to improve the quality and reliability of cable laying, and reduces the impact of external interference on cable operation.

[0141] Example 7

[0142] On the basis of Example 1, step S4 constructs an interference assessment matrix based on the underground comprehensive electromagnetic field influence factor of each basic path and the surface extreme field intensity interference factor of each type of factor of each basic path, including:

[0143]

[0144] in, is the interference assessment matrix, A 1max is the surface extreme environmental electric field interference factor based on the environmental electric field for the first basic path, A 2max is the surface extreme environmental electric field interference factor based on the environmental electric field for the second basic path, A nmax is the surface extreme environmental electric field interference factor based on the environmental electric field of the nth basic path, B 1max is the surface extreme magnetic field interference factor based on the ambient magnetic field for the first basic path,

[0145] B 2maxis the surface extreme magnetic field interference factor based on the ambient magnetic field for the second basic path, B nmax is the surface extreme magnetic field interference factor based on the ambient magnetic field of the nth basic path, C 1max is the surface extreme electric field interference factor based on temperature and humidity for the first basic path, C 2max is the surface extreme electric field interference factor based on temperature and humidity for the second basic path, C nmax is the surface extreme electric field interference factor based on temperature and humidity of the nth basic path, D 1max is the surface extreme magnetic field interference factor based on temperature and humidity for the first basic path,

[0146] D 2max is the surface extreme magnetic field interference factor based on temperature and humidity for the second basic path, D nmax is the surface extreme magnetic field interference factor based on temperature and humidity for the nth basic path, E 1 is the underground comprehensive electromagnetic field impact factor of the first basic path, E 2 is the underground comprehensive electromagnetic field impact factor of the second basic path, E n is the underground comprehensive electromagnetic field impact factor of the nth basic path.

[0147] The working principle and beneficial effects of the above technical solution are as follows: the interference assessment matrix can comprehensively consider the underground comprehensive electromagnetic field impact factor and the surface extreme field strength interference factor, and take the influence of different factors into consideration in the assessment, so as to more comprehensively assess the external interference of the cable laying environment. The interference assessment matrix can numerically represent the degree of external interference by quantifying the underground comprehensive electromagnetic field impact factor and the surface extreme field strength interference factor, which is helpful to compare and evaluate the relative importance of different interference factors and provides an accurate measurement of external interference.

[0148] Example 8

[0149] On the basis of Example 7, step S4 obtains the external interference evaluation result of the cable based on the interference evaluation matrix, including:

[0150] Step S41, remove the elements of each column in the interference assessment matrix in turn, use the column of the elements removed each time as the middle column, and use the new matrix obtained by each removal as the middle matrix corresponding to the middle column;

[0151] Step S42: Use the middle column corresponding to the middle matrix with the largest rank among all the middle matrices as the evaluation column, and use all elements in the evaluation column as reference elements for cable selection.

[0152] The working principle and beneficial effects of the above technical solution are: by eliminating elements in the interference evaluation matrix and selecting the intermediate matrix with the largest rank, the evaluation columns and reference elements can be determined, the interference degree of the cable can be quantified, and the accuracy and scientificity of cable selection can be improved.

[0153] Example 9

[0154] On the basis of Embodiment 1, step S5 selects the cable based on the external interference evaluation result of the cable, including:

[0155] Step S51: Calculate the preset interference electromagnetic field strength of the cable based on the reference elements selected in the interference assessment matrix:

[0156]

[0157] Among them, W x is the preset interference electromagnetic field strength of the cable, W 0 is the reference interference electromagnetic field, exp represents the exponential with e as the base, It is the reference element of underground comprehensive electromagnetic field impact factor selected based on the interference assessment matrix. is the reference element of the ground extreme environmental electric field interference factor based on the environmental electric field selected in the interference assessment matrix, is the reference element of the surface extreme electric field interference factor based on temperature and humidity selected in the interference assessment matrix, is the reference element of the ground extreme magnetic field interference factor based on the environmental magnetic field selected in the interference assessment matrix, is the reference element of the surface extreme magnetic field interference factor based on temperature and humidity selected in the interference assessment matrix, β 1 is the correction coefficient of the electric field interference factor, β 2 is the correction coefficient of magnetic field interference factor;

[0158] Step S52: Based on the preset interference electromagnetic field strength of the cable and formula (8), the thickness of the insulation layer between the inner diameter of the cable insulation shielding layer and the outer diameter of the cable conductor shielding layer is calculated:

[0159]

[0160] Among them, U 0 is the rated voltage of the cable, d is the radius of the cable conductor, Ln is the natural logarithm with e as the base, h 1 is the thickness of the cable conductor shielding layer, Δ is the thickness of the insulation layer between the inner diameter of the cable insulation shielding layer and the outer diameter of the cable conductor shielding layer, To compensate for the electromagnetic field strength;

[0161] Step S53: Calculate the thickness of the insulation outer sheath of the cable based on the reference element selected in the interference assessment matrix:

[0162]

[0163] Among them, h 2 is the thickness of the cable's outer insulation sheath, is the reference underground comprehensive electromagnetic field impact factor selected based on the interference assessment matrix, h 20 The base thickness of the cable's outer insulation sheath;

[0164] Step S54: Select a cable based on the calculated values ​​of steps S52 and S53.

[0165] In this embodiment, the reference elements selected in the interference assessment matrix include the surface extreme environmental electric field interference factor of a certain basic path based on the environmental electric field, the surface extreme magnetic field interference factor of a certain basic path based on the environmental magnetic field, the surface extreme electric field interference factor of a certain basic path based on temperature and humidity, the surface extreme magnetic field interference factor of a certain basic path based on temperature and humidity, and the underground comprehensive electromagnetic field influence factor of a certain basic path.

[0166] In this embodiment, the preset interference electromagnetic field strength of the cable is a preset interference electromagnetic field strength value to which the cable is subjected at the cable laying path.

[0167] The working principle and beneficial effects of the above technical solution are as follows: by using the reference elements selected from the interference evaluation matrix, the preset interference electromagnetic field strength of the cable is calculated; based on the preset interference electromagnetic field strength of the cable and formula (8), the thickness of the insulation layer between the inner diameter of the cable insulation shielding layer and the outer diameter of the cable conductor shielding layer is calculated; at the same time, based on the reference elements selected from the interference evaluation matrix, the thickness of the insulation outer sheath of the cable is calculated; the actual parameters of the cable can be preliminarily determined by comprehensively considering the radius value of the cable conductor, the thickness of the insulation layer between the inner diameter of the cable insulation shielding layer and the outer diameter of the cable conductor shielding layer, and the thickness of the insulation outer sheath of the cable; finally, the actual parameters of the selected cable can be finally determined based on the construction cost; and the accuracy and scientificity of the cable selection are greatly improved through steps S51-S54.

[0168] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A cable auxiliary selection method based on cable shielding field strength, characterized in that: The following steps are involved: S1. Conduct a field survey of the construction environment for laying cables, and plan the cable laying path based on the survey results to obtain the cable laying planning path and cable laying parameters designed based on the cable laying path; S2. Divide the planned cable laying path into a number of basic paths of equal length, perform basic path environmental detection on each basic path for a preset number of days through a cable auxiliary selection device, and obtain various environmental detection data of each basic path every day; S3. Calculate the surface field strength interference factors of various factors of each basic path every day based on various environmental detection data of each basic path every day, select the maximum value of the surface field strength interference factors of various factors within a preset number of days for each basic path based on the surface field strength interference factors of various factors every day, and use it as the surface extreme field strength interference factor of various factors for each basic path; S4. Obtain the underground comprehensive electromagnetic field influence factor based on the cable laying parameters of each basic path, construct an interference assessment matrix based on the underground comprehensive electromagnetic field influence factor of each basic path and the surface extreme field strength interference factor of each type of factor of each basic path, and obtain the external interference assessment result of the cable based on the interference assessment matrix; S5. Select cables based on the external interference evaluation results of the cables.

2. A cable auxiliary selection method based on cable shielding field strength according to claim 1, characterized in that: Step S1 includes: S11, demarcating the area to be inspected based on the starting end of the cable laying, and determining the shooting route of the drone based on the area to be inspected; S12. Obtain basic remote sensing images of the area to be investigated based on the shooting route of the UAV; S13, determining the area to be supplemented based on the clarity and completeness of the basic remote sensing image, and determining the route for supplementary acquisition and shooting by the drone based on the area to be supplemented; S14, obtaining supplementary remote sensing images of the area to be supplemented based on the supplementary acquisition and shooting route of the UAV; S15, obtaining a final remote sensing image of the area to be investigated based on the basic remote sensing image and the supplementary remote sensing image; S16. Perform cable laying path planning based on the final remote sensing image of the area to be investigated, and obtain the cable laying planning path and cable laying parameters designed based on the cable laying path.

3. A cable auxiliary selection method based on cable shielding field strength according to claim 2, characterized in that: Step S13 includes: S130, analyzing the clarity of the basic remote sensing image, and determining a basic remote sensing image area whose clarity does not meet the requirement; S131, analyzing the integrity of the basic remote sensing image, and determining the basic remote sensing image area whose integrity does not meet the requirements; S132. The basic remote sensing image area whose clarity does not meet the requirement and the basic remote sensing image area whose completeness does not meet the requirement are combined to form an area to be supplemented.

4. The cable auxiliary selection method based on cable shielding field strength according to claim 2 is characterized in that: Step S15 includes: The clarity and integrity of the area in the basic remote sensing image where the clarity or integrity does not meet the requirements are compared with the clarity and integrity of the corresponding coordinates of the supplementary remote sensing image. When the clarity and integrity of the corresponding coordinates of the supplementary remote sensing image are greater than the clarity and integrity of the corresponding coordinates in the basic remote sensing image, the image of the corresponding coordinates in the basic remote sensing image is replaced with the image of the corresponding coordinates in the supplementary remote sensing image to obtain a final remote sensing image. When the clarity and integrity of the corresponding coordinates of the supplementary remote sensing image are less than the clarity and integrity of the corresponding coordinates in the basic remote sensing image, remote sensing image acquisition is performed again for the coordinates to form a new supplementary remote sensing image, and then a comparison and replacement is performed.

5. The cable auxiliary selection method based on cable shielding field strength according to claim 1, characterized in that: Step S4: Obtain the underground comprehensive electromagnetic field influence factor based on the cable laying parameters of each basic path: Among them, E n is the underground comprehensive electromagnetic field impact factor of the nth basic path, e is a natural number, and its value is 2.71, T 1n is the soil temperature value of the nth foundation path at the corresponding laying depth, S 1n is the soil moisture value of the nth foundation path at the corresponding laying depth, T 10 is the soil reference temperature at the cable laying location, S 10 is the soil reference humidity value at the cable laying location, H n is the laying depth parameter of the cable of the nth basic path, is the interference coefficient of soil temperature on electromagnetic field, is the interference coefficient of soil moisture on the electromagnetic field, and γ is the shielding coefficient of the unit laying depth of the cable to the external electromagnetic field.

6. The cable auxiliary selection method based on cable shielding field strength according to claim 1, characterized in that: Step S3 calculates the surface field intensity interference factors of various factors of each basic path every day based on various environmental detection data of each basic path every day, including: The daily surface electric field interference factor based on the environmental electric field for the nth basic path is: where a j is the detection value of the surface electric field detection unit of the daily cable auxiliary selection device at the nth basic path in the jth detection period, m is the total detection time of the daily cable auxiliary selection device, and α1 is the interference intensity coefficient of the unit surface electric field strength on the cable; The daily surface magnetic field interference factor based on the ambient magnetic field for the nth basic path is: where b j is the detection value of the surface magnetic field detection unit of the daily cable auxiliary selection device at the nth basic path in the jth detection period, and α2 is the interference intensity coefficient of the unit surface magnetic field intensity on the cable; The daily surface electric field interference factor based on temperature and humidity for the nth basic path is: where c Tj is the detection value of the surface temperature detection unit of the daily cable auxiliary selection device at the nth basic path in the jth detection period, e is a natural number with a value of 2.71, c T0 is the surface reference temperature, c Sj is the detection value of the surface humidity detection unit of the daily cable auxiliary selection device at the jth detection period at the nth basic path, c T0 is the reference humidity value of the ground surface, C0 is the ground surface electric field interference factor of the reference temperature and humidity; The daily surface magnetic field interference factor based on temperature and humidity for the nth basic path is: D0 is the surface electric field interference factor of the reference temperature and humidity.

7. The cable auxiliary selection method based on cable shielding field strength according to claim 1, characterized in that: Step S4 constructs an interference assessment matrix based on the underground comprehensive electromagnetic field influence factor of each basic path and the surface extreme field intensity interference factor of each type of factor of each basic path, including: in, is the interference assessment matrix, A 1max is the surface extreme environmental electric field interference factor based on the environmental electric field for the first basic path, A 2max is the surface extreme environmental electric field interference factor based on the environmental electric field for the second basic path, A nmax is the surface extreme environmental electric field interference factor based on the environmental electric field of the nth basic path, B 1max is the surface extreme magnetic field interference factor based on the ambient magnetic field for the first basic path, B 2max is the surface extreme magnetic field interference factor based on the ambient magnetic field for the second basic path, B nmax is the surface extreme magnetic field interference factor based on the ambient magnetic field of the nth basic path, C 1max is the surface extreme electric field interference factor based on temperature and humidity for the first basic path, C 2max is the surface extreme electric field interference factor based on temperature and humidity for the second basic path, C nmax is the surface extreme electric field interference factor based on temperature and humidity of the nth basic path, D 1max is the surface extreme magnetic field interference factor based on temperature and humidity for the first basic path, D 2max is the surface extreme magnetic field interference factor based on temperature and humidity for the second basic path, D nmax is the surface extreme magnetic field interference factor based on temperature and humidity of the nth basic path, E1 is the underground comprehensive electromagnetic field influence factor of the first basic path, E2 is the underground comprehensive electromagnetic field influence factor of the second basic path, and E n is the underground comprehensive electromagnetic field impact factor of the nth basic path.

8. The cable auxiliary selection method based on cable shielding field strength according to claim 7, characterized in that: Step S4 obtains the external interference evaluation result of the cable based on the interference evaluation matrix, including: Step S41, remove the elements of each column in the interference assessment matrix in turn, use the column of the elements removed each time as the middle column, and use the new matrix obtained by each removal as the middle matrix corresponding to the middle column; Step S42: Use the middle column corresponding to the middle matrix with the largest rank among all the middle matrices as the evaluation column, and use all elements in the evaluation column as reference elements for cable selection.

9. The cable auxiliary selection method based on cable shielding field strength according to claim 1, characterized in that: Step S5, based on the external interference evaluation result of the cable, selecting the cable includes: Step S51: Calculate the preset interference electromagnetic field strength of the cable based on the reference elements selected in the interference assessment matrix: Among them, W x is the preset interference electromagnetic field strength of the cable, W0 is the reference interference electromagnetic field, exp represents the exponential with e as the base, It is the reference element of underground comprehensive electromagnetic field impact factor selected based on the interference assessment matrix. is the reference element of the ground extreme environmental electric field interference factor based on the environmental electric field selected in the interference assessment matrix, is the reference element of the surface extreme electric field interference factor based on temperature and humidity selected in the interference assessment matrix, is the reference element of the ground extreme magnetic field interference factor based on the environmental magnetic field selected in the interference assessment matrix, is the reference element of the surface extreme magnetic field interference factor based on temperature and humidity selected in the interference assessment matrix, β1 is the correction coefficient of the electric field interference factor, and β2 is the correction coefficient of the magnetic field interference factor; Step S52: Based on the preset interference electromagnetic field strength of the cable and formula (8), the thickness of the insulation layer between the inner diameter of the cable insulation shielding layer and the outer diameter of the cable conductor shielding layer is calculated: Among them, U0 is the rated voltage of the cable, d is the radius of the cable conductor, Ln is the natural logarithm with base e, h1 is the thickness of the cable conductor shielding layer, Δ is the thickness of the insulation layer between the inner diameter of the cable insulation shielding layer and the outer diameter of the cable conductor shielding layer, To compensate for the electromagnetic field strength; Step S53: Calculate the thickness of the insulation outer sheath of the cable based on the reference element selected in the interference assessment matrix: Where, h2 is the thickness of the cable's outer insulation sheath, is the reference underground comprehensive electromagnetic field impact factor selected based on the interference assessment matrix, h 20 The base thickness of the cable’s outer insulation sheath; Step S54: Select a cable based on the calculated values ​​of steps S52 and S53.

10. A cable auxiliary selection device, used to implement a cable auxiliary selection method based on cable shielding field strength as claimed in any one of claims 1 to 9, characterized in that: include: The path planning module performs cable laying path planning based on the investigation results, obtains the cable laying planning path and the cable laying parameters based on the cable laying path design; Detection module, the detection module includes a surface electric field detection unit, a surface magnetic field detection unit, a surface temperature detection unit and a surface humidity detection unit. The detection module is used to obtain various environmental detection data of each basic path every day; The surface extreme field intensity interference factor calculation module is used to obtain the surface extreme field intensity interference factors of various factors of each basic path based on the detection results of the detection module; The evaluation module constructs an interference evaluation matrix based on the underground comprehensive electromagnetic field influence factor of each basic path and the surface extreme field strength interference factor of each type of factor of each basic path, and obtains the external interference evaluation result of the cable based on the interference evaluation matrix; The cable parameter calculation unit is used to calculate the cable parameters based on the external interference evaluation result of the cable, and select the cable based on the calculation result.

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