An electromagnetic environment early warning system and method for transmission lines

Abstract

The present invention belongs to the technical field of power transmission line monitoring and early warning, and discloses an electromagnetic environment early warning system and method for power transmission lines, comprising a sag measurement module, a data processing module and an early warning module; the sag measurement module is used to measure the sag data of the power transmission line; the data processing module is used to calculate the electromagnetic environment information around the power transmission line by using a simulated charge method according to the sag data of the power transmission line and the power information of the power transmission line; the early warning module is used to compare the electromagnetic environment data around the power transmission line with a preset electromagnetic environment threshold value to obtain the electromagnetic environment early warning result of the power transmission line; the present invention can realize rapid and accurate prediction and early warning of the electromagnetic field around the power transmission line without manual inspection, and can effectively improve the efficiency of construction and maintenance.

Description

Technical Field

[0001] The present invention belongs to the technical field of power transmission line monitoring and early warning, and in particular relates to an electromagnetic environment early warning system and method for power transmission lines. Background Art

[0002] With the development of economy, the demand for electricity in high-load density cities is increasing. Transmission line projects are inevitably close to densely populated areas or social production areas. Among the complaints about power grid environmental protection caused by this, disputes involving the electromagnetic environment of overhead lines account for a large proportion. Since the public does not have professional electromagnetic field knowledge and lacks intuitive understanding of the electromagnetic environment, and occasionally metal bodies near transmission lines are affected by "numb electricity", "transient electric shock" and "induced current", they have a fear and rejection of high-voltage transmission lines. At the same time, in power construction and production maintenance, it is often necessary to work near live bodies, and safety considerations also require the distribution of electromagnetic fields near transmission lines. Therefore, how to effectively warn of the electromagnetic environment around transmission lines will effectively reduce users' fear and complaints about high-voltage lines, while improving the efficiency of construction and maintenance operations.

[0003] At present, in order to ensure a stable and continuous supply of electricity, patrol inspections are usually used to conduct early warning monitoring of the electromagnetic environment around transmission lines. The traditional patrol inspection method is mainly for patrol personnel to drive or walk and use instruments or visually inspect power facilities. However, due to the long transmission lines and complex terrain along the lines, the influence of factors such as buildings and trees, and the large climate differences, the early warning monitoring of the electromagnetic environment around the transmission lines is inefficient, and there is a technical problem of high errors in the early warning results. Summary of the invention

[0004] In view of the technical problems existing in the prior art, the present invention provides an electromagnetic environment early warning system and method for transmission lines to solve the technical problems of low efficiency and high error when early warning monitoring of the electromagnetic environment around transmission lines is carried out in a patrol manner.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is: The present invention provides an electromagnetic environment early warning system for a power transmission line, comprising a sag measurement module, a data processing module and an early warning module; The sag measurement module is used to measure the sag data of the transmission line; The data processing module is used to calculate the electromagnetic environment information around the transmission line by using the simulated charge method according to the sag data of the transmission line and the power information of the transmission line; The early warning module is used to compare the electromagnetic environment data around the transmission line with a preset electromagnetic environment threshold to obtain an electromagnetic environment early warning result of the transmission line.

[0006] Furthermore, the sag measurement module adopts a sag measuring instrument; wherein the sag measuring instrument is arranged on the iron tower of the transmission line.

[0007] Furthermore, the electromagnetic environment information around the transmission line includes the power frequency electric field and the power frequency magnetic field around the transmission line.

[0008] Furthermore, according to the sag data of the transmission line and the power information of the transmission line, the process of calculating the power frequency electric field and the power frequency magnetic field around the transmission line by using the simulated charge method is as follows: constructing a catenary model of the transmission line according to the sag data of the transmission line; According to the catenary model of the transmission line and the power information of the transmission line, the simulated charge information describing the transmission line is obtained by using a simulated charge method; According to the simulated charge information describing the transmission line, the power frequency electric field and the power frequency magnetic field around the transmission line are calculated using the superposition principle.

[0009] Furthermore, the calculation process of the power frequency electric field around the transmission line is as follows:

[0010]

[0011]

[0012]

[0013]

[0014]

[0015] in, is the power frequency electric field around the transmission line; Any point in the space around the transmission line Along The electric field intensity component in the axial direction; for The conjugate vector of The same size and opposite direction; Any point in the space around the transmission line Along The electric field intensity component in the axial direction; for The conjugate vector of The same size and opposite direction; is the dielectric constant of air; is the total number of nodes; For the transmission line Simulated line charge density of phase conductors; Any point in the space around the transmission line exist Coordinates in the axis direction; For the n The horizontal coordinate of each node; Conductor for transmission line The distance to the observation point; Conductor for transmission line The distance from the mirror image to the observation point; Any point in the space around the transmission line exist Coordinates in the axis direction; For the n The vertical coordinate of each node; is the potential coefficient matrix P The inverse matrix of is the electric potential of the wire; For wire n Its own potential coefficient matrix; It is the vertical distance between each conductor in the transmission line and the ground; is the radius of each conductor in the transmission line; For wire n and wire m The potential coefficient matrix between ; Conductor for transmission line The mirror image of the transmission line conductor distance; Conductor for transmission line Conductors in transmission lines distance.

[0016] Furthermore, the calculation process of the power frequency magnetic field around the transmission line is as follows:

[0017]

[0018]

[0019] in, is the power frequency magnetic field around the transmission line; Any point in the space around the transmission line Along Component of magnetic field intensity in the axial direction; for The conjugate vector of The same size and opposite direction; Any point in the space around the transmission line Along Component of magnetic field intensity in the axial direction; for The conjugate vector of The same size and opposite direction; is the vacuum permeability; For wire n The current at .

[0020] Furthermore, the catenary model of the transmission line is specifically:

[0021]

[0022] in, is the vertical distance of the conductor; is the gear spacing; is the conductor horizontal stress coefficient; is the horizontal coordinate of the wire; is a constant, indicating the k Segment conductor; is the height of the wire hanging end point; It is the sag data of the transmission line.

[0023] Furthermore, the power information of the transmission line includes the surface potential of the transmission line.

[0024] Furthermore, it also includes a human-computer interaction operation interface module; The human-machine interactive operation interface module is used to receive and send power information of the power transmission line to the data processing module; The human-machine interactive operation interface module is also used to display the electromagnetic environment information around the transmission line and the electromagnetic environment early warning results of the transmission line.

[0025] The present invention also provides an electromagnetic environment early warning method for a power transmission line, using the electromagnetic environment early warning system for a power transmission line; The electromagnetic environment early warning method for a power transmission line comprises: Measure the sag data of transmission lines; According to the sag data of the transmission line and the power information of the transmission line, the electromagnetic environment information around the transmission line is calculated by using a simulated charge method; The electromagnetic environment data around the transmission line is compared with the preset electromagnetic environment threshold to obtain the electromagnetic environment warning result of the transmission line.

[0026] Compared with the prior art, the present invention has the following beneficial effects: The electromagnetic environment early warning system and method for transmission lines provided by the present invention calculate the electromagnetic environment information around the transmission line by measuring the sag data of the transmission line and combining it with the power information of the transmission line, and compare the electromagnetic environment information around the transmission line with the threshold value to obtain the electromagnetic environment early warning result of the transmission line; specifically, a simulated charge method is adopted to realize the real simulation of the electromagnetic environment around the transmission line based on the sag data of the transmission line and the power information of the transmission line, so as to realize the rapid and accurate prediction and early warning of the electromagnetic field around the transmission line, without the need for manual inspection, and at the same time can effectively improve the efficiency of construction and maintenance.

[0027] Furthermore, the electromagnetic environment information around the transmission line is displayed through the human-computer interaction interface module, so that the electromagnetic environment of the transmission line can be visualized, and the electromagnetic field distribution characteristics around the transmission line can be directly observed. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A structural block diagram of an electromagnetic environment early warning system for a power transmission line provided in Example 1; Figure 2 This is a flow chart of the electromagnetic environment early warning method for power transmission lines provided in Example 2.

[0029] Among them, 1 is a sag measurement module, 2 is a data processing module, 3 is an early warning module, and 4 is a human-computer interaction operation interface module. DETAILED DESCRIPTION

[0030] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail in the following specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0031] Example 1 As attached Figure 1 As shown, this embodiment 1 provides an electromagnetic environment early warning system for a power transmission line, including a sag measurement module 1, a data processing module 2, an early warning module 3 and a human-computer interaction operation interface module 4.

[0032] The output end of the sag measurement module 1 is connected to the input end of the data processing module 2 , the data processing module 2 establishes a bidirectional connection with the early warning module 3 , and the data processing module 2 also establishes a bidirectional connection with the human-computer interaction operation interface module 4 .

[0033] The sag measurement module 1 is used to measure the sag data of the transmission line and send the measured sag data of the transmission line to the data processing module 2; wherein, the sag measurement module 1 adopts a sag measuring instrument, and the sag measuring instrument is installed on the iron tower of the transmission line; preferably, the sag measuring instrument adopts the sag measuring instrument Sagometer produced by EDM (Engineering Data Management).

[0034] It should be noted that the measurement principle of the sag meter Sagometer is: by presetting a target on the conductor of the transmission line, using an image acquisition device to capture the image of the preset target, and using digital image processing technology to obtain the coordinate value of the preset target, and then calculate the sag of the overhead transmission line; wherein the image acquisition device uses a camera or a still camera.

[0035] The data processing module 2 is used to calculate the electromagnetic environment information around the transmission line based on the sag data of the transmission line and the power information of the transmission line by using the simulated charge method; wherein the power information of the transmission line includes the surface potential of the transmission line; the electromagnetic environment information around the transmission line includes the power frequency electric field and the power frequency magnetic field around the transmission line.

[0036] In this embodiment 2, the process of calculating the electromagnetic environment information around the transmission line using the simulated charge method according to the sag data of the transmission line and the power information of the transmission line is as follows: According to the sag data of the transmission line, a catenary model of the transmission line is constructed; wherein the catenary model of the transmission line is specifically:

[0037]

[0038] in, is the vertical distance of the conductor; is the gear spacing; is the conductor horizontal stress coefficient; is the horizontal coordinate of the wire; is a constant, indicating the k Segment conductor; is the height of the wire hanging end point; It is the sag data of the transmission line.

[0039] According to the catenary model of the transmission line and the power information of the transmission line, simulated charge information describing the transmission line is obtained through a simulated charge method.

[0040] According to the simulated charge information describing the transmission line, the power frequency electric field and the power frequency magnetic field around the transmission line are calculated using the superposition principle; wherein the calculation process of the power frequency electric field around the transmission line is as follows:

[0041]

[0042]

[0043]

[0044]

[0045]

[0046] in, is the power frequency electric field around the transmission line; Any point in the space around the transmission line Along The electric field intensity component in the axial direction; for The conjugate vector of The same size and opposite direction; Any point in the space around the transmission line Along The electric field intensity component in the axial direction; for The conjugate vector of The same size and opposite direction; is the dielectric constant of air; is the total number of nodes; For the transmission line Simulated line charge density of phase conductors; Any point in the space around the transmission line exist Coordinates in the axis direction; For the n The horizontal coordinate of each node; Conductor for transmission line The distance to the observation point; Conductor for transmission line The distance from the mirror image to the observation point; Any point in the space around the transmission line exist Coordinates in the axis direction; For the n The vertical coordinate of each node; is the potential coefficient matrix P The inverse matrix of is the electric potential of the wire; For wire n Its own potential coefficient matrix; It is the vertical distance between each conductor in the transmission line and the ground; is the radius of each conductor in the transmission line; For wire n and wire m The potential coefficient matrix between ; Conductor for transmission line The mirror image of the transmission line conductor distance; Conductor for transmission line Conductors in transmission lines distance.

[0047] The calculation process of the power frequency magnetic field around the transmission line is as follows:

[0048]

[0049]

[0050] in, is the power frequency magnetic field around the transmission line; Any point in the space around the transmission line Along Component of magnetic field intensity in the axial direction; for The conjugate vector of The same size and opposite direction; Any point in the space around the transmission line Along Component of magnetic field intensity in the axial direction; for The conjugate vector of The same size and opposite direction; is the vacuum permeability, ; For wire n The current at .

[0051] It should be noted that the data processing module 2 is also used for forwarding data information; specifically, it is used to send the electromagnetic environment information around the transmission line to the early warning module 3 and to send the electromagnetic environment information around the transmission line and the electromagnetic environment early warning result of the transmission line to the human-computer interaction operation interface module 4.

[0052] The early warning module 3 is used to compare the electromagnetic environment data around the transmission line with a preset electromagnetic environment threshold to obtain an electromagnetic environment early warning result of the transmission line; wherein the preset electromagnetic environment threshold includes a preset electric field threshold and a preset magnetic field threshold.

[0053] Specifically, the electromagnetic environment data around the transmission line is compared with a preset electromagnetic environment threshold to obtain an electromagnetic environment warning result of the transmission line, and the steps are as follows: Compare the electromagnetic environment data around the transmission line with the preset electromagnetic environment threshold; if the electromagnetic environment data around the transmission line is greater than or equal to the preset electromagnetic environment threshold, the electromagnetic environment warning result of the transmission line is dangerous; otherwise, the electromagnetic environment warning result of the transmission line is non-dangerous; output the electromagnetic environment warning result of the transmission line, and send the electromagnetic environment warning result of the transmission line to the data processing module 2; wherein, the electromagnetic environment warning result of the transmission line is output in an editable file format.

[0054] The human-machine interactive operation interface module 4 is used to receive and send power information of the transmission line to the data processing module 2; it is also used to display the electromagnetic environment information around the transmission line and the electromagnetic environment warning results of the transmission line. Specifically, the human-machine interactive operation interface module 4 includes an information input operation interface, a power frequency electric field display interface, a power frequency magnetic field display interface and a warning display interface; preferably, each function of the human-machine interactive operation interface module 4 is implemented using 3D virtual reality technology.

[0055] The information input operation interface is used to receive the power information of the transmission line input by the user, and send the power information of the transmission line to the data processing module 2; the power frequency electric field display interface is used to display the power frequency electric field of the transmission line; the power frequency magnetic field display interface is used to display the power frequency magnetic field of the transmission line; the early warning display interface is used to mark the electromagnetic environment early warning result of the transmission line to the corresponding area of ​​the three-dimensional model of the transmission line in the early warning display interface; wherein, the area where the electromagnetic environment early warning result of the transmission line is dangerous is marked in red, and the area where the electromagnetic environment early warning result of the transmission line is not dangerous is marked in white.

[0056] The electromagnetic environment early warning system for power transmission lines described in the present embodiment 1 uses a sag measurement module to measure the sag data of the power transmission line; uses the sag data of the power transmission line measured by the data processing module and the power information of the power transmission line, and adopts the simulated charge method to analyze and calculate the electromagnetic environment information around the power transmission line; inputs the power information of the power line through the human-computer interaction interface module, and displays the electromagnetic environment information around the power transmission line; uses the early warning module to compare the threshold of the electromagnetic environment data around the power transmission line, obtains the electromagnetic environment early warning result of the power transmission line, and realizes rapid and accurate early warning of the electromagnetic environment of the power transmission line; the present invention does not need to collect meteorological data around the power transmission line, which greatly reduces the difficulty of early warning and improves the efficiency of early warning.

[0057] In this embodiment 1, the sag measurement module uses image processing technology to accurately capture image targets, so as to achieve accurate measurement of the sag data of the transmission line; the data processing module is based on the two-dimensional simulated charge method, and the electric field and magnetic field are analyzed and calculated according to the sag data and the power information of the transmission line to obtain the electromagnetic environment information around the transmission line; the electromagnetic environment information of the transmission line is transmitted to the early warning module, and when the electric field strength or magnetic field strength of the transmission line exceeds the threshold, the early warning result is output as dangerous, so as to prompt the construction personnel to stop the corresponding operation.

[0058] Example 2 This embodiment 2 provides an electromagnetic environment early warning method for a power transmission line, using the electromagnetic environment early warning system for a power transmission line as described in the above embodiment 1; Figure 2 As shown, the electromagnetic environment early warning method for power transmission lines comprises the following steps: Step 1: Measure the sag data of the transmission line. Specifically, a sag measuring instrument Sagometer is used to accurately capture the image target using image processing technology to obtain the sag data of the transmission line.

[0059] Step 2: According to the sag data of the transmission line and the power information of the transmission line, the electromagnetic environment information around the transmission line is calculated by using the simulated charge method. Specifically, the steps include: Step 21: construct a catenary model of the transmission line according to the sag data of the transmission line; assuming that the continuous multi-base straight towers have the same span, the expression of the catenary model of the transmission line is: (1) in, is the vertical distance of the conductor; is the gear spacing; is the conductor horizontal stress coefficient; is the horizontal coordinate of the wire; is a constant, indicating the k Segment conductor; is the height of the wire hanging end point; It is the sag data of the transmission line.

[0060] The expression of the sag data of the transmission line is: (2) in, It is the sag data of the transmission line.

[0061] It should be noted that by substituting the sag data of the transmission line measured in step 1 into formula (2), the horizontal stress coefficient of the conductor can be obtained: , and then the conductor horizontal stress coefficient Substituting into formula (1), the catenary model of the transmission line can be obtained; thus, it can be seen that in this embodiment 2, the catenary model of the transmission line can be obtained without collecting meteorological data, and the process is simple, efficient and convenient for subsequent calculations.

[0062] Step 22: According to the catenary model of the transmission line and the power information of the transmission line, simulated charge information describing the transmission line is obtained by using a simulated charge method; wherein the power information of the transmission line includes the surface potential of the transmission line.

[0063] Specifically, the process of obtaining the simulated charge information describing the transmission line through the simulated charge method is as follows: Step 221: according to the catenary model of the transmission line, setting the simulated charge, the position and the number of matching points.

[0064] Step 222: Establish a simulated charge equation and solve it to obtain the charge value of the simulated charge at each position point.

[0065] Step 223, select a check point on the surface of the transmission line; use the charge value of the simulated charge at each position point to calculate the potential of the check point; calculate the relative error between the potential of the check point and the surface potential of the transmission line to obtain the potential relative error value.

[0066] Step 224, compare the potential relative error with a preset error threshold; if the potential relative error is less than the preset error threshold, output the charge value of the simulated charge at each position point to obtain the simulated charge information describing the transmission line; if the potential relative error is greater than or equal to the preset error threshold, return to step 221 to reset the simulated charge, the position and number of matching points, and then solve.

[0067] Step 23: Based on the simulated charge information describing the transmission line, the power frequency electric field and the power frequency magnetic field around the transmission line are calculated using the superposition principle.

[0068] (1) The calculation process of the power frequency electric field around the transmission line is as follows: Assume that the transmission line The simulated linear charge density of the phase conductor is , and the transmission line Simulated Linear Charge Density of Phase Conductors Concentrated at the center of the conductor; among them, the first Simulated Linear Charge Density of Phase Conductors It is calculated based on the known potential of the matching point on the conductor surface; specifically, the Simulated Linear Charge Density of Phase Conductors The calculation process is as follows: (3) in, For the transmission line Simulated line charge density of phase conductors; is the potential coefficient matrix P The inverse matrix of is the electric potential of the wire.

[0069] is the potential coefficient matrix; where the potential coefficient matrix The elements in are obtained according to the mirror principle; specifically, the wire n Its own potential coefficient matrix The calculation formula is as follows: (4) wire n and wire m Potential coefficient matrix between The calculation formula is as follows: (5) It should be noted that the potential coefficient matrix middle and are equal, and .

[0070] in, For wire n Its own potential coefficient matrix; is the dielectric constant of air; It is the vertical distance between each conductor in the transmission line and the ground; is the radius of each conductor in the transmission line; For wire n and wire m The potential coefficient matrix between ; Conductor for transmission line The mirror image of the transmission line conductor distance; Conductor for transmission line Conductors in transmission lines distance.

[0071] The electric field intensity components at any point in the space around the transmission line can be calculated based on the superposition principle.

[0072] Specifically, any point in the space around the transmission line Along The electric field intensity component in the axial direction The calculation process is as follows: (6) Any point in the space around the transmission line Along The electric field intensity component in the axial direction The calculation process is as follows: (7) in, Any point in the space around the transmission line Along The electric field intensity component in the axial direction; Any point in the space around the transmission line Along The electric field intensity component in the axial direction; is the dielectric constant of air; is the total number of wire nodes; For the transmission line Simulated line charge density of phase conductors; Any point in the space around the transmission line exist Coordinates in the axis direction; For the n The horizontal coordinate of each node; Conductor for transmission line The distance to the observation point; Conductor for transmission line The distance from the mirror image to the observation point; Any point in the space around the transmission line exist Coordinates in the axis direction; For the n The vertical coordinate of the node.

[0073] The calculation process of the power frequency electric field around the transmission line, that is, the effective value of the synthetic electric field, is as follows: (8) in, is the power frequency electric field around the transmission line; Any point in the space around the transmission line Along The electric field intensity component in the axial direction; for The conjugate vector of The same size and opposite direction; Any point in the space around the transmission line Along The electric field intensity component in the axial direction; for The conjugate vector of The same size and opposite direction.

[0074] (2) The calculation process of the power frequency magnetic field around the transmission line is as follows: Assume that the transmission line has The calculation process of the magnetic induction intensity at any point in the space around the transmission line, i.e. the power frequency magnetic field around the transmission line, is as follows:

[0075]

[0076]

[0077] in, is the power frequency magnetic field around the transmission line; Any point in the space around the transmission line Along Component of magnetic field intensity in the axial direction; for The conjugate vector of The same size and opposite direction; Any point in the space around the transmission line Along Component of magnetic field intensity in the axial direction; for The conjugate vector of The same size and opposite direction; is the vacuum permeability, ; For wire n The current at .

[0078] Step 3: Compare the electromagnetic environment data around the transmission line with the preset electromagnetic environment threshold to obtain the electromagnetic environment warning result of the transmission line. Specifically, the steps are as follows: The electromagnetic environment data around the transmission line is compared with a preset electromagnetic environment threshold.

[0079] If the electromagnetic environment data around the transmission line is greater than or equal to a preset electromagnetic environment threshold, the electromagnetic environment warning result of the transmission line is dangerous; otherwise, the electromagnetic environment warning result of the transmission line is not dangerous.

[0080] Step 4: Visually display the power frequency electric field and power frequency magnetic field around the transmission line and the electromagnetic environment warning results of the transmission line.

[0081] In this embodiment 2, the sag data of the transmission line is measured, and combined with the power information of the transmission line, the power frequency electric field and the power frequency magnetic field around the transmission line are calculated; and according to the power frequency electric field environment and the magnetic field environment near the transmission line, the early warning analysis information is output to realize the rapid real-time visualization and early warning analysis of the dynamic electromagnetic environment; the present invention can display the electromagnetic environment of the transmission line to the public and operators through 3D virtual reality technology, so that they can intuitively understand the electromagnetic environment around the transmission line, which will effectively reduce users' fear and complaints about high-voltage lines, and at the same time improve the efficiency of construction and maintenance operations.

[0082] The electromagnetic environment early warning system and method for power transmission lines described in the present invention install a sag measurement module on the iron tower of the power transmission line, collect sag data of the power transmission line, and transmit the collected sag data back to the data processing module; transmit the power information of the power transmission line input by the human-computer interaction interface module to the data processing module, calculate the electric field and magnetic field around the power transmission line, and display them; transmit the data obtained by the data processing module to the early warning module for early warning; wherein the early warning module compares the power frequency electric field and power frequency magnetic field around the transmission line with the preset threshold value; if the electromagnetic environment information is greater than or equal to the preset threshold value, it is marked as a red dangerous area; otherwise, it is marked as a white non-dangerous area; at the same time, the early warning module outputs an editable early warning analysis result report; it should be noted that the power frequency electric field and power frequency magnetic field around the transmission line are also stored in the background for subsequent call and viewing.

[0083] In the present invention, a simulated charge method is adopted, combined with the sag data of the transmission line, to calculate the power frequency electric field and the power frequency magnetic field, so as to truly simulate the distribution of the power frequency electric field and the power frequency magnetic field under the overhead transmission line, and realize the rapid prediction and early warning of the distribution characteristics of the synthetic electromagnetic field and the ion flow field of the transmission line; the electromagnetic environment early warning result of the transmission line is displayed through the human-computer interaction operation interface module, and the visual early warning of the electromagnetic environment around the transmission line is realized, which can greatly reduce the user's fear and complaints about the high-voltage line, and at the same time improve the efficiency of construction and maintenance operations; at the same time, the early warning monitoring of the electromagnetic environment around the transmission line can be realized without manual inspection, and the early warning monitoring efficiency is high and the error is small.

[0084] The above embodiment is only one of the implementation methods that can realize the technical solution of the present invention. The scope of protection claimed by the present invention is not limited only to this embodiment, but also includes changes, replacements and other implementation methods that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the present invention.

Claims

1. An electromagnetic environment early warning system for power transmission lines, characterized in that: Including sag measurement module, data processing module and early warning module; The sag measurement module is used to measure the sag data of the transmission line; The data processing module is used to calculate the electromagnetic environment information around the transmission line by using the simulated charge method according to the sag data of the transmission line and the power information of the transmission line; The early warning module is used to compare the electromagnetic environment data around the transmission line with a preset electromagnetic environment threshold to obtain an electromagnetic environment early warning result of the transmission line.

2. The electromagnetic environment early warning system for power transmission lines according to claim 1, characterized in that: The sag measurement module adopts a sag measuring instrument; wherein the sag measuring instrument is arranged on the iron tower of the transmission line.

3. The electromagnetic environment early warning system for power transmission lines according to claim 1, characterized in that: The electromagnetic environment information around the transmission line includes the power frequency electric field and the power frequency magnetic field around the transmission line.

4. The electromagnetic environment early warning system for power transmission lines according to claim 3, characterized in that: According to the sag data of the transmission line and the power information of the transmission line, the process of calculating the power frequency electric field and the power frequency magnetic field around the transmission line by using the simulated charge method is as follows: constructing a catenary model of the transmission line according to the sag data of the transmission line; According to the catenary model of the transmission line and the power information of the transmission line, the simulated charge information describing the transmission line is obtained by using a simulated charge method; According to the simulated charge information describing the transmission line, the power frequency electric field and the power frequency magnetic field around the transmission line are calculated using the superposition principle.

5. The electromagnetic environment early warning system for power transmission lines according to claim 4, characterized in that: The calculation process of the power frequency electric field around the transmission line is as follows: in, is the power frequency electric field around the transmission line; Any point in the space around the transmission line Along The electric field intensity component in the axial direction; for The conjugate vector of are of the same magnitude and opposite direction; Any point in the space around the transmission line Along The electric field intensity component in the axial direction; for The conjugate vector of are of the same magnitude and opposite direction; is the dielectric constant of air; is the total number of nodes; For the transmission line Simulated line charge density of phase conductors; Any point in the space around the transmission line exist Coordinates in the axis direction; For the n The horizontal coordinate of each node; Conductor for transmission line The distance to the observation point; Conductor for transmission line The distance from the mirror image to the observation point; Any point in the space around the transmission line exist Coordinates in the axis direction; For the n The vertical coordinate of each node; is the potential coefficient matrix P The inverse matrix of is the electric potential of the wire; For wire n Its own potential coefficient matrix; It is the vertical distance between each conductor in the transmission line and the ground; is the radius of each conductor in the transmission line; For wire n and wire m The potential coefficient matrix between ; Conductor for transmission line The mirror image of the transmission line conductor distance; Conductor for transmission line Conductors in transmission lines distance.

6. The electromagnetic environment early warning system for power transmission lines according to claim 4, characterized in that: The calculation process of the power frequency magnetic field around the transmission line is as follows: in, is the power frequency magnetic field around the transmission line; Any point in the space around the transmission line Along Component of magnetic field intensity in the axial direction; for The conjugate vector of are of the same magnitude and opposite direction; Any point in the space around the transmission line Along Component of magnetic field intensity in the axial direction; for The conjugate vector of are of the same magnitude and opposite direction; is the vacuum permeability; For wire n The current at .

7. The electromagnetic environment early warning system for power transmission lines according to claim 4, characterized in that: The catenary model of the transmission line is specifically: in, is the vertical distance of the conductor; is the gear spacing; is the conductor horizontal stress coefficient; is the horizontal coordinate of the wire; is a constant, indicating the k Segment conductor; is the height of the wire hanging end point; It is the sag data of the transmission line.

8. The electromagnetic environment early warning system for power transmission lines according to claim 4, characterized in that: The power information of the transmission line includes the surface potential of the transmission line.

9. The electromagnetic environment early warning system for power transmission lines according to claim 1, characterized in that: It also includes a human-computer interaction interface module; The human-machine interactive operation interface module is used to receive and send power information of the power transmission line to the data processing module; The human-machine interactive operation interface module is also used to display the electromagnetic environment information around the transmission line and the electromagnetic environment early warning results of the transmission line.

10. An electromagnetic environment early warning method for a power transmission line, characterized in that: Utilizing the electromagnetic environment early warning system for power transmission lines as described in any one of claims 1 to 9; The electromagnetic environment early warning method for a power transmission line comprises: Measure the sag data of transmission lines; According to the sag data of the transmission line and the power information of the transmission line, the electromagnetic environment information around the transmission line is calculated by using a simulated charge method; The electromagnetic environment data around the transmission line is compared with the preset electromagnetic environment threshold to obtain the electromagnetic environment warning result of the transmission line.

Images