A method, system, device and medium for monitoring ice-covered state of transmission line

Abstract

The present application discloses a method, system, device and medium for monitoring the icing state of a transmission line. The method comprises: determining the equivalent icing thickness of the transmission line by an inversion method based on a line parameter table of the transmission line, the current inclination angle of the transmission line and the current ambient temperature; calculating the current icing thickness of the transmission line based on an initial image and a current image of the transmission line; calculating the density of the icing on the transmission line according to the equivalent icing thickness and the current icing thickness, thereby determining the icing state on the transmission line. The present application can reduce the calculation error of the icing density of the transmission line, thereby improving the accuracy of judging the icing state on the transmission line.

Description

Technical Field

[0001] The present invention relates to the field of monitoring of power transmission lines, and in particular to a method, system, device and medium for monitoring the icing state of a power transmission line. Background Art

[0002] Transmission line icing refers to the process in which water droplets in the air solidify on the surface of the conductor / ground wire in various forms after encountering the transmission line during ice and snow disaster weather. Transmission line icing can cause insulator ice flash, overload, line dancing, and even line breakage and tower collapse, which seriously threaten the safe operation of the power grid. There are many types of conductor icing, including rime, mixed rime, rime, wet snow, and various mixed freezing types. The density of different types of icing varies greatly, and different types of icing have different effects on transmission lines. Relevant personnel need to understand the icing status on the transmission line in order to deal with the icing problem of the transmission line more specifically.

[0003] At present, the existing ice monitoring devices mainly use sensors to directly monitor the equivalent ice thickness to determine the ice status on the transmission line. However, the monitoring effect of such sensors is often affected by problems such as zero drift, which will increase the calculation error of ice density and lead to inaccurate judgment of the ice status on the transmission line. Summary of the invention

[0004] The present application provides a method, system, device and medium for monitoring the icing status of a transmission line, which can reduce the calculation error of the icing density of the transmission line, thereby improving the accuracy of judging the icing status on the transmission line.

[0005] In order to achieve the above purpose, this application adopts the following technical solutions:

[0006] In a first aspect, the present application provides a method for monitoring the ice coating state of a transmission line, comprising:

[0007] Based on a conductor parameter table of a transmission line, a current inclination angle of the transmission line, and a current ambient temperature, determining an equivalent ice thickness of the transmission line by an inversion method;

[0008] Calculating the current ice thickness of the transmission line based on the initial image and the current image of the transmission line;

[0009] The density of ice on the transmission line is calculated according to the equivalent ice thickness and the current ice thickness, so as to determine the ice state on the transmission line.

[0010] According to an achievable method of the first aspect of the present application, the equivalent ice thickness of the transmission line is determined by an inversion method based on a line parameter table of the transmission line, a current inclination angle of the transmission line, and a current ambient temperature, specifically comprising:

[0011] S101, obtaining the current ambient temperature and the current inclination angle of the transmission line;

[0012] S102, setting a preset ice thickness of the transmission line;

[0013] S103, determining the ice load of the transmission line under a preset ice coating thickness, thereby obtaining a comprehensive load of the transmission line;

[0014] S104, determining the horizontal tension of the transmission line under the preset ice coating thickness based on the line parameter table, the current ambient temperature and the comprehensive load;

[0015] S105, determining a theoretical inclination angle of the transmission line based on the comprehensive load, the horizontal tension and the conductor parameter table, wherein the theoretical inclination angle is the inclination angle of the transmission line under the preset ice coating thickness;

[0016] S106: Determine whether the theoretical inclination angle is greater than the current inclination angle of the transmission line:

[0017] If not, then n units are added to the preset ice thickness, and steps S103 to S106 are repeated as a new preset ice thickness;

[0018] If yes, then reduce the preset ice thickness by (nx) units, and repeat steps S103-S105 as the new preset ice thickness, and then execute step S107 after obtaining the theoretical inclination angle of the transmission line under the preset ice thickness;

[0019] S107, judging whether the theoretical inclination angle is greater than the current inclination angle of the transmission line:

[0020] If not, add x units to the preset ice thickness as the new preset ice thickness, repeat steps S103-S105, and then execute step S107 until the theoretical inclination angle is greater than the current inclination angle of the transmission line. The current preset ice thickness is the equivalent ice thickness.

[0021] According to an achievable method of the first aspect of the present application, determining the horizontal tension of the transmission line at the preset ice thickness based on the line parameter table, the current ambient temperature and the comprehensive load specifically includes:

[0022] Establishing a state equation of the transmission line based on the line parameter table, the current ambient temperature and the comprehensive load;

[0023] The state equation is solved to obtain the horizontal tension of the transmission line under the preset ice coating thickness.

[0024] According to an achievable manner of the first aspect of the present application, the state equation of the transmission wire is as follows:

[0025]

[0026] In the formula, H n represents the current horizontal tension of the transmission line, l represents the initial setting span, and w m represents the initial transmission line load per unit length, E represents the initial transmission line elastic coefficient, S represents the initial transmission line cross-sectional area, H m represents the initial horizontal tension of the transmission line, α represents the initial temperature expansion coefficient of the line, t m Indicates the initial setting of the ambient temperature, Indicates the initial setting of the gear height difference angle, w n represents the comprehensive load of the transmission line, t n Indicates the current ambient temperature.

[0027] According to an achievable method of the first aspect of the present application, the theoretical inclination angle of the transmission line is determined based on the comprehensive load, the horizontal tension and the line parameter table, and the specific determination formula is:

[0028]

[0029] In the formula, l represents the initial gear distance, h represents the initial gear height difference, θ A The theoretical inclination angle of the transmission line, H n represents the current horizontal tension of the transmission line, Indicates the initial setting of the gear height difference angle.

[0030] According to an achievable manner of the first aspect of the present application, the calculating the current ice thickness of the transmission line based on the initial image and the current image of the transmission line specifically includes:

[0031] Based on the initial image of the power transmission line, the number of pixels occupied by the diameter of the power transmission line is determined according to an image detection algorithm as a first number;

[0032] Determine an actual width corresponding to each pixel based on the first number and the diameter of the transmission wire;

[0033] Based on the current image of the power transmission line, the number of pixels occupied by the current diameter of the power transmission line determined according to the image detection algorithm is used as the second number;

[0034] Based on the second number, the current ice thickness of the transmission line is calculated according to the actual width corresponding to each pixel.

[0035] According to an achievable method of the first aspect of the present application, the density of ice on the transmission line is calculated according to the equivalent ice thickness and the current ice thickness, and the specific calculation formula is:

[0036]

[0037] In the formula, ρ represents the ice density, D represents the diameter of the transmission line, δ represents the equivalent ice thickness, and δ i Indicates the current ice thickness.

[0038] In a second aspect, the present application provides a system for monitoring the ice coating status of a transmission line conductor, the system comprising:

[0039] An equivalent ice thickness determination module is used to determine the equivalent ice thickness of the transmission line through an inversion method based on a line parameter table of the transmission line, a current inclination angle of the transmission line, and a current ambient temperature;

[0040] A current ice thickness calculation module, used to calculate the current ice thickness of the transmission line based on the initial image and the current image of the transmission line;

[0041] The icing state determination module is used to calculate the density of ice on the transmission line according to the equivalent ice thickness and the current ice thickness, so as to determine the icing state on the transmission line.

[0042] In a third aspect, the present application also provides a device for monitoring the ice-covered state of a power transmission line, the device comprising a line inclination sensor, a camera, a microprocessor, and a wireless intelligent meteorological sensor;

[0043] The camera is connected to the microprocessor and is used to capture an initial image and a current image of the transmission line;

[0044] The conductor inclination sensor is connected to the microprocessor and is used to collect the current inclination angle of the transmission conductor;

[0045] The wireless intelligent meteorological sensor is connected to the microprocessor and is used to obtain the current ambient temperature;

[0046] The microprocessor is used to execute the steps of any one of the above-mentioned methods for monitoring the icing status of a transmission line.

[0047] In a fourth aspect, the present application further provides a storage medium, wherein a computer program is stored in the storage medium, and when the computer program is executed by a processor, the steps of any one of the above-mentioned methods for monitoring the icing status of a transmission line are implemented.

[0048] Compared with the prior art, the present application provides a method, system, device and medium for monitoring the icing status of a transmission line. The icing status of the transmission line is determined based on the equivalent icing thickness of the transmission line determined by the inversion method and the current icing thickness of the transmission line calculated by image analysis. The icing density of the transmission line is calculated and then the icing status is determined. The present application can reduce the calculation error of the icing density of the transmission line, thereby improving the accuracy of judging the icing status on the transmission line, and provides more accurate monitoring data for targeted treatment of icing problems on transmission lines. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 A flow chart of a method for monitoring the ice coating state of a power transmission line provided in a preferred embodiment of the present application;

[0050] Figure 2 A flow chart of a method for monitoring the ice coating state of a power transmission line provided in a preferred embodiment of the present application;

[0051] Figure 3 A flow chart of a method for monitoring the ice coating state of a power transmission line provided in a preferred embodiment of the present application;

[0052] Figure 4 A flow chart of a method for monitoring the ice coating state of a power transmission line provided in a preferred embodiment of the present application;

[0053] Figure 5 A structural block diagram of a device for monitoring the icing status of a power transmission line provided in a preferred embodiment of the present application. DETAILED DESCRIPTION

[0054] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0055] The term "comprise" and any variations thereof in the specification and claims of the present application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0056] In the embodiments of the present application, the terms "first", "second", etc. are used to distinguish identical items or similar items with substantially the same effects and functions. It should be understood that there is no logical or temporal dependency between the "first", "second", and "Nth", nor are there any limitations on the quantity and execution order.

[0057] The embodiments of the present application are further described in detail below in conjunction with the drawings in the specification.

[0058] Figure 1 Shown is a flow chart of a method for monitoring the icing status of a power transmission line provided by a more preferred embodiment of the present application.

[0059] like Figure 1 As shown, the method includes:

[0060] S1. Determine the equivalent ice thickness of the transmission line by an inversion method based on a line parameter table of the transmission line, a current inclination angle of the transmission line, and a current ambient temperature;

[0061] Specifically, the data in the conductor parameter table of different types of transmission lines are different. The data in the conductor parameter table of the transmission line mainly include the initially set horizontal tension of the transmission line, the initially set span, the initially set elastic coefficient of the transmission line, the initially set expansion coefficient of the transmission line, the initially set load per unit length of the transmission line, the initially set cross-sectional area of ​​the transmission line, the initially set diameter of the transmission line, the initially set ambient temperature, the initially set height difference angle within the span, and the initially set height difference within the span, etc.

[0062] like Figure 2 As shown, the step S1 specifically includes:

[0063] S101, obtaining the current ambient temperature and the current inclination angle of the transmission line;

[0064] Among them, the current ambient temperature refers to the temperature of the environment in which the transmission line is located at the current moment, which can be obtained through a wireless intelligent meteorological sensor. The current ambient temperature obtained by the wireless intelligent meteorological sensor is more accurate, which can reduce the calculation error of the ice density, thereby improving the accuracy of judging the ice state on the transmission line; the inclination angle of the transmission line changes with the thickness of the ice on the transmission line. The thicker the ice on the transmission line, the greater the inclination angle of the transmission line. The current inclination angle of the transmission line refers to the inclination angle of the transmission line at the current moment, and preferably, it can be obtained through a conductor inclination sensor.

[0065] S102, setting a preset ice thickness of the transmission line;

[0066] The preset ice coating thickness is set according to actual conditions. Preferably, the preset ice coating thickness is set to 1 mm in advance, that is, the initial value of the preset ice coating thickness is 1 mm.

[0067] S103, determining the ice load of the transmission line under a preset ice coating thickness, thereby obtaining a comprehensive load of the transmission line;

[0068] The calculation formula for ice load is: D is the diameter of the transmission line, b is the preset ice thickness, and w2 is the ice load on the transmission line under the preset ice thickness.

[0069] Among them, the calculation formula for the comprehensive load of the transmission line is w n =w m +w2,w m is the load per unit length of the transmission line, w n is the combined load of the transmission line.

[0070] S104, determining the horizontal tension of the transmission line under the preset ice coating thickness based on the line parameter table, the current ambient temperature and the comprehensive load;

[0071] like Figure 3 As shown, the step S104 specifically includes:

[0072] S1041, establishing a state equation of the transmission line based on the line parameter table, the current ambient temperature and the comprehensive load;

[0073] The state equation of the transmission line is as follows:

[0074]

[0075] In the formula, H n represents the current horizontal tension of the transmission line, l represents the initial setting span, and w mrepresents the initial transmission line load per unit length, E represents the initial transmission line elastic coefficient, S represents the initial transmission line cross-sectional area, H m represents the initial horizontal tension of the transmission line, α represents the initial temperature expansion coefficient of the line, t m Indicates the initial setting of the ambient temperature, Indicates the initial height difference angle, w n represents the comprehensive load of the transmission line, t n Indicates the current ambient temperature.

[0076] S1042. Solve the state equation to obtain the horizontal tension of the transmission line under the preset ice coating thickness.

[0077] Among them, any method that can be implemented by software can be used to solve the state equation to obtain the horizontal tension of the transmission line under the preset ice thickness, and the solution method is not limited here.

[0078] S105, determining a theoretical inclination angle of the transmission line based on the comprehensive load, the horizontal tension and the conductor parameter table, wherein the theoretical inclination angle is the inclination angle of the transmission line under the preset ice coating thickness;

[0079] The calculation formula of the theoretical tilt angle is: l represents the initial gear distance, h represents the initial gear height difference, θ A The theoretical inclination angle of the transmission line, H n represents the current horizontal tension of the transmission line, Indicates the initial setting of the gear height difference angle.

[0080] S106: Determine whether the theoretical inclination angle is greater than the current inclination angle of the transmission line:

[0081] If not, then n units are added to the preset ice thickness, and steps S103 to S106 are repeated as a new preset ice thickness;

[0082] If yes, then reduce the preset ice thickness by (nx) units, and repeat steps S103-S105 as the new preset ice thickness, and then execute step S107 after obtaining the theoretical inclination angle of the transmission line under the preset ice thickness;

[0083] The specific values ​​of n and x can be set according to actual conditions. Preferably, the n unit is set to 1 mm, and the x unit is set to 0.1 mm.

[0084] S107, judging whether the theoretical inclination angle is greater than the current inclination angle of the transmission line:

[0085] If not, add x units to the preset ice thickness as the new preset ice thickness, repeat steps S103-S105, and then execute step S107 until the theoretical inclination angle is greater than the current inclination angle of the transmission line. The current preset ice thickness is the equivalent ice thickness.

[0086] The equivalent ice thickness represents the preset ice thickness corresponding to the theoretical inclination angle closest to the current inclination angle.

[0087] S2. Calculating the current ice thickness of the transmission line based on the initial image and the current image of the transmission line;

[0088] Among them, the initial image and the current image are images of the transmission line captured by the shooting device based on the same position and the same angle, and the pixel sizes of the two images are consistent. Information about the transmission line can be obtained from the initial image or the current image, such as the number of pixels occupied by the transmission line in the image, etc. The initial image here refers to the image of the transmission line in the un-ice-covered state, and the current image refers to the image of the transmission line at the current moment, which can be the image of the transmission line in the un-ice-covered state or the image of the transmission line in the ice-covered state. The current image is not limited here.

[0089] like Figure 4 As shown, the step S2 specifically includes:

[0090] S201, based on the initial image of the power transmission line, determining the number of pixels occupied by the diameter of the power transmission line according to an image detection algorithm as a first number;

[0091] Specifically, by analyzing the initial image of the transmission line through an image detection algorithm, the number of pixels occupied by the diameter of the transmission line in the non-ice-covered state can be determined.

[0092] The specific steps of analyzing an image using the preferred image detection algorithm are as follows:

[0093] a) Select the lower 1 / 4 of the image as the analysis area;

[0094] b) converting the selected analysis area into a grayscale image and filtering it in the horizontal direction to eliminate horizontal threads;

[0095] c) performing binarization and dilation processing;

[0096] d) Set the scan line, divide the image into k parts by height, set the row pixels corresponding to the scan line to 0, clearly separate the scan area, and perform detection inside each area. In general, k is set to 5;

[0097] e) Find the contour and save the inflection point information of the contour.

[0098] f) For each detected contour, find the smallest regular rectangle that wraps the contour, and then filter these rectangles to remove rectangles that do not meet the area height and have too large a length difference. The number of filtered rectangles is generally consistent with the number of divided scanning areas.

[0099] g) Fitting a straight line using the lower right vertices and lower left vertices of all rectangular boxes, the fitted straight line is the detected edge contour line of the transmission line;

[0100] h) Calculate the distances between the vertices on both sides of the rectangular box and the fitted straight line, and delete the rectangular box where the outliers are located;

[0101] i) Determine the number of pixels occupied by the diameter of the transmission line in the image through the remaining valid rectangular frame.

[0102] S202, determining an actual width corresponding to each pixel based on the first number and the diameter of the transmission wire;

[0103] Specifically, the first number refers to the number of pixels occupied by the diameter of the transmission line in an ice-free state. Assuming that the first number is A and the diameter of the transmission line is D, the actual width corresponding to each pixel is D / A.

[0104] S203, based on the current image of the power transmission line, determining the number of pixels occupied by the current diameter of the power transmission line according to the image detection algorithm as a second number;

[0105] Specifically, the number of pixels occupied by the transmission line in the image after being covered with ice will increase with the increase of the ice thickness. The current image of the transmission line is the image obtained at the current moment, and the number of pixels occupied by the transmission line in the ice-covered state can be determined by the image detection algorithm.

[0106] S204. Based on the second number, calculate the current ice thickness of the transmission line according to the actual width corresponding to each pixel.

[0107] Specifically, assuming that the first quantity is A, the second quantity is B, and the diameter of the transmission line is D, then the current ice thickness is

[0108] S3. Calculate the density of ice on the transmission line according to the equivalent ice thickness and the current ice thickness, so as to determine the ice state on the transmission line.

[0109] Among them, the specific calculation formula for the ice density on the transmission line is: In the formula, ρ represents the ice density, D represents the diameter of the transmission line, δ represents the equivalent ice thickness, and δ i Indicates the current ice thickness.

[0110] Specifically, an ice covering density of 0.1 to 0.3 corresponds to rime, an ice covering density of 0.3 to 0.5 corresponds to wet snow, an ice covering density of 0.5 to 0.7 corresponds to mixed rime, and an ice covering density of 0.7 to 0.9 corresponds to sleet.

[0111] For example, a LGJ-400 / 35 type conductor is used as a transmission conductor, and the initially set transmission conductor horizontal tension H can be determined by viewing the conductor parameter table of the transmission conductor. m The initial setting of the transmission line elastic coefficient E is 65000N / mm. 2 The initial expansion coefficient of the transmission line is 20.5×10 -6 / ℃, the initial transmission line load per unit length w m The initial cross-sectional area S of the transmission line is 425.24 mm 2 , the initial transmission line diameter D is 26.6mm, the initial ambient temperature is 15℃, and the initial height difference angle is The current ambient temperature is -5°C and the current tilt angle is 5.21°. Determine the ice load on the transmission line at a preset ice thickness and the n =w m After determining the comprehensive load of the transmission line under the preset ice thickness, the horizontal tension of the transmission line under the preset ice thickness is solved by the state equation. Obtain the theoretical inclination angle of the transmission line under the preset ice thickness. In this example, the theoretical inclination angle of the transmission line under the preset ice coating thickness is calculated starting from the preset ice coating thickness of 1 mm, and then the corresponding theoretical inclination angle is calculated with the initially set preset ice coating thickness increasing by 1 mm each time. When the preset ice coating thickness is calculated to be 5 mm, the theoretical inclination angle of the transmission line under the ice coating thickness of 5 mm is 5.2147°, which is greater than the current inclination angle of 5.21°. This indicates that the preset ice coating thickness is greater than the actual ice coating thickness on the transmission line. In order to further improve the accuracy of the equivalent ice coating density, we start from the preset ice coating thickness of 4 mm and calculate the corresponding theoretical inclination angle by increasing by 0.1 mm. The calculation shows that the corresponding theoretical inclination angle when the preset ice coating thickness is 4.9 mm is 5.2055°. At this time, there is the following relationship: the theoretical inclination angle corresponding to the preset ice coating thickness of 4.9 mm is 5.2055°<the current inclination angle 5.21°<the theoretical inclination angle 5.2147° when the preset ice coating thickness is 5 mm, so the equivalent ice coating thickness is 5 mm. In this embodiment, the number of pixels occupied by the transmission line in the non-icing state is detected by the image detection algorithm to be 134, so as to determine the actual width corresponding to each pixel is 0.2mm / pixel. The number of pixels occupied by the transmission line in the iced state is detected by the image detection algorithm to be 208, so it can be determined that the actual ice thickness of the transmission line at the current moment is 7.5mm. In this embodiment, the diameter of the transmission line is 26.6mm, the equivalent ice thickness is 5mm, and the actual ice thickness is 7.5mm. According to the calculation formula of ice density, the density of ice on the transmission line is calculated as According to the fact that the ice coverage state corresponding to the ice coverage density of 0.5 to 0.7 is mixed frost, it can be determined that the ice coverage state detected this time is mixed frost.

[0112] Figure 5 The figure is a structural block diagram of a transmission line ice coating state monitoring system provided by a preferred embodiment of the present application, the system comprising:

[0113] An equivalent ice thickness determination module 501 is used to determine the equivalent ice thickness of the transmission line by an inversion method based on a line parameter table of the transmission line, a current inclination angle of the transmission line, and a current ambient temperature;

[0114] A current ice thickness calculation module 502, configured to calculate the current ice thickness of the transmission line based on the initial image and the current image of the transmission line;

[0115] The ice coating state determination module 503 is used to calculate the density of ice coating on the transmission line according to the equivalent ice coating thickness and the current ice coating thickness, so as to determine the ice coating state on the transmission line.

[0116] Preferably, the equivalent ice thickness determination module 501 further includes:

[0117] Theoretical inclination angle determination unit, the first calculation unit is used to obtain the current ambient temperature and the current inclination angle of the transmission line; set the preset ice coating thickness of the transmission line; determine the ice load of the transmission line under the preset ice coating thickness, so as to obtain the comprehensive load of the transmission line; based on the line parameter table, the current ambient temperature and the comprehensive load, determine the horizontal tension of the transmission line under the preset ice coating thickness; based on the comprehensive load, the horizontal tension and the line parameter table, determine the theoretical inclination angle of the transmission line, wherein the theoretical inclination angle is the inclination angle of the transmission line under the preset ice coating thickness;

[0118] A first judgment unit is used to judge whether the theoretical inclination angle is greater than the current inclination angle of the transmission line; if not, n units are added to the preset ice coating thickness as the new preset ice coating thickness, and the theoretical inclination angle corresponding to the new ice coating thickness is re-determined according to the theoretical inclination angle determination unit; if so, (nx) units are reduced from the preset ice coating thickness as the new preset ice coating thickness, and the theoretical inclination angle corresponding to the new ice coating thickness is re-determined according to the theoretical inclination angle determination unit as the new preset ice coating thickness, so as to obtain the theoretical inclination angle of the transmission line under the preset ice coating thickness;

[0119] The second judgment unit is used to judge whether the theoretical inclination angle is greater than the current inclination angle of the transmission line; if not, x units are added to the preset ice coating thickness as the new preset ice coating thickness, and the theoretical inclination angle corresponding to the new ice coating thickness is re-determined according to the theoretical inclination angle determination unit, and the second judgment unit is re-executed until the theoretical inclination angle is greater than the current inclination angle of the transmission line, and the current preset ice coating thickness is the equivalent ice coating thickness.

[0120] Preferably, the equivalent ice thickness determination module 501 further includes:

[0121] A state equation establishing unit, used to establish a state equation of the transmission line based on the line parameter table, the current ambient temperature and the comprehensive load;

[0122] The state equation solving unit is used to solve the state equation to obtain the horizontal tension of the transmission line under the preset ice coating thickness.

[0123] Preferably, the ice density calculation module 503 specifically includes:

[0124] A first quantity determination unit, configured to determine, based on the initial image of the power transmission line, the number of pixels occupied by the diameter of the power transmission line determined according to an image detection algorithm as a first quantity;

[0125] an actual width determining unit, configured to determine an actual width corresponding to each pixel based on the first number and the diameter of the power transmission wire;

[0126] A second number determination unit, configured to determine, based on the current image of the power transmission line, the number of pixels occupied by the current diameter of the power transmission line determined according to the image detection algorithm as the second number;

[0127] A current ice coating thickness calculation unit is used to calculate the current ice coating thickness of the transmission line based on the second number and according to the actual width corresponding to each pixel.

[0128] In a preferred embodiment, a device for monitoring the ice density of a transmission line is also provided, the device comprising a conductor inclination sensor, a camera, a microprocessor, and a wireless intelligent meteorological sensor; the camera is connected to the microprocessor and is used to collect an initial image and a current image of the transmission line; the conductor inclination sensor is connected to the microprocessor and is used to collect the current inclination angle of the transmission line; the wireless intelligent meteorological sensor is connected to the microprocessor and is used to obtain the current ambient temperature; the microprocessor is used for the steps of the above-mentioned method for monitoring the ice coverage status of the transmission line.

[0129] In a more preferred embodiment, a storage medium is further provided, wherein a computer program is stored in the storage medium, and when the computer program is executed by a processor, the steps of any one of the above-mentioned methods for monitoring the icing status of a power transmission line are performed.

[0130] The above is a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications are also considered to be within the scope of protection of the present application.

[0131] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiments can be implemented by instructing related hardware through a computer program, and the program can be stored in a computer-readable storage medium, and when the program is executed, it can include the processes of the embodiments of the above-mentioned methods. The storage medium can be a disk, an optical disk, a ROM (Rend-Only Memory) or a Random Access Memory (RnM), etc.

Claims

1. A method for monitoring the ice coating state of a power transmission line, characterized in that: include: S100, based on the line parameter table of the transmission line, the current inclination angle of the transmission line and the current ambient temperature, determine the equivalent ice thickness of the transmission line by an inversion method, the sub-steps of step S100 are: S101, obtaining the current ambient temperature and the current inclination angle of the transmission line; S102, setting a preset ice thickness of the transmission line; S103, determining the ice load of the transmission line under a preset ice coating thickness, thereby obtaining a comprehensive load of the transmission line; S104, determining the horizontal tension of the transmission line under the preset ice coating thickness based on the line parameter table, the current ambient temperature and the comprehensive load; S105, determining a theoretical inclination angle of the transmission line based on the comprehensive load, the horizontal tension and the conductor parameter table, wherein the theoretical inclination angle is the inclination angle of the transmission line under the preset ice coating thickness; S106: Determine whether the theoretical inclination angle is greater than the current inclination angle of the transmission line: If not, then n units are added to the preset ice thickness, and steps S103 to S106 are repeated as a new preset ice thickness; If yes, then reduce the preset ice thickness by (nx) units, and repeat steps S103-S105 as the new preset ice thickness, and then execute step S107 after obtaining the theoretical inclination angle of the transmission line under the preset ice thickness; S107, judging whether the theoretical inclination angle is greater than the current inclination angle of the transmission line: If not, then x units are added to the preset ice thickness as the new preset ice thickness, and steps S103-S105 are repeated, and then step S107 is performed until the theoretical inclination angle is greater than the current inclination angle of the transmission line, and the current preset ice thickness is the equivalent ice thickness; S200, calculating the current ice thickness of the transmission line based on the initial image and the current image of the transmission line; S300: Calculate the density of ice on the transmission line according to the equivalent ice thickness and the current ice thickness, so as to determine the ice state on the transmission line.

2. The method for monitoring the ice coating state of a power transmission line according to claim 1, characterized in that: The determining, based on the conductor parameter table, the current ambient temperature and the comprehensive load, the horizontal tension of the transmission conductor under the preset ice coating thickness comprises: Establishing a state equation of the transmission line based on the line parameter table, the current ambient temperature and the comprehensive load; The state equation is solved to obtain the horizontal tension of the transmission line under the preset ice coating thickness.

3. The method for monitoring the ice coating state of a power transmission line according to claim 2, characterized in that: The state equation of the transmission line is as follows: In the formula, H n represents the current horizontal tension of the transmission line, l represents the initial setting span, and w m represents the initial transmission line load per unit length, E represents the initial transmission line elastic coefficient, S represents the initial transmission line cross-sectional area, H m represents the initial horizontal tension of the transmission line, α represents the initial temperature expansion coefficient of the line, t m Indicates the initial setting of the ambient temperature, Indicates the initial setting of the gear height difference angle, w n represents the comprehensive load of the transmission line, t n Indicates the current ambient temperature.

4. The method for monitoring the ice coating state of a power transmission line according to claim 2, characterized in that: The theoretical inclination angle of the transmission line is determined based on the comprehensive load, the horizontal tension and the conductor parameter table. The specific determination formula is: In the formula, l represents the initial gear distance, h represents the initial gear height difference, θ A The theoretical inclination angle of the transmission line, H n represents the current horizontal tension of the transmission line, Indicates the initial setting of the gear height difference angle.

5. The method for monitoring the ice coating state of a power transmission line according to any one of claims 1 to 4, characterized in that: The step of calculating the current ice thickness of the transmission line based on the initial image and the current image of the transmission line comprises: Based on the initial image of the power transmission line, the number of pixels occupied by the diameter of the power transmission line is determined according to an image detection algorithm as a first number; Determine an actual width corresponding to each pixel based on the first number and the diameter of the transmission wire; Based on the current image of the power transmission line, the number of pixels occupied by the current diameter of the power transmission line determined according to the image detection algorithm is used as the second number; Based on the second number, the current ice thickness of the transmission line is calculated according to the actual width corresponding to each pixel.

6. The method for monitoring the ice coating state of a power transmission line according to claim 5, characterized in that: The density of ice on the transmission line is calculated according to the equivalent ice thickness and the current ice thickness. The specific calculation formula is: In the formula, ρ represents the ice density, D represents the diameter of the transmission line, δ represents the equivalent ice thickness, and δ i Indicates the current ice thickness.

7. A monitoring system for the ice coating state of a power transmission line, characterized in that: include: The equivalent ice thickness determination module is used to determine the equivalent ice thickness of the transmission line by an inversion method based on the line parameter table of the transmission line, the current inclination angle of the transmission line and the current ambient temperature, and the sub-steps are: S101, obtaining the current ambient temperature and the current inclination angle of the transmission line; S102, setting a preset ice thickness of the transmission line; S103, determining the ice load of the transmission line under a preset ice coating thickness, thereby obtaining a comprehensive load of the transmission line; S104, determining the horizontal tension of the transmission line under the preset ice coating thickness based on the line parameter table, the current ambient temperature and the comprehensive load; S105, determining a theoretical inclination angle of the transmission line based on the comprehensive load, the horizontal tension and the conductor parameter table, wherein the theoretical inclination angle is the inclination angle of the transmission line under the preset ice coating thickness; S106: Determine whether the theoretical inclination angle is greater than the current inclination angle of the transmission line: If not, then n units are added to the preset ice thickness, and steps S103 to S106 are repeated as a new preset ice thickness; If yes, then reduce the preset ice thickness by (nx) units, and repeat steps S103-S105 as the new preset ice thickness, and then execute step S107 after obtaining the theoretical inclination angle of the transmission line under the preset ice thickness; S107, judging whether the theoretical inclination angle is greater than the current inclination angle of the transmission line: If not, then x units are added to the preset ice thickness as the new preset ice thickness, and steps S103-S105 are repeated, and then step S107 is performed until the theoretical inclination angle is greater than the current inclination angle of the transmission line, and the current preset ice thickness is the equivalent ice thickness; A current ice thickness calculation module, used to calculate the current ice thickness of the transmission line based on the initial image and the current image of the transmission line; The icing state determination module is used to calculate the density of ice on the transmission line according to the equivalent ice thickness and the current ice thickness, so as to determine the icing state on the transmission line.

8. A monitoring device for the ice coating state of a power transmission line, characterized in that: The device includes a wire inclination sensor, a camera, a microprocessor, and a wireless intelligent meteorological sensor; The camera is connected to the microprocessor and is used to capture an initial image and a current image of the transmission line; The conductor inclination sensor is connected to the microprocessor and is used to collect the current inclination angle of the transmission conductor; The wireless intelligent meteorological sensor is connected to the microprocessor and is used to obtain the current ambient temperature; The microprocessor is used to execute the steps of the method for monitoring the ice coating status of a transmission line as described in any one of claims 1 to 6.

9. A storage medium, characterized in that: The storage medium stores a computer program, and when the computer program is executed by the processor, the steps of the method for monitoring the ice coating state of the transmission line as described in any one of claims 1 to 6 are implemented.

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