Online monitoring method and system for wind deflection angle of suspension insulator of transmission line

Abstract

The present invention discloses an online monitoring method and system for the wind deflection angle of a suspension insulator of a transmission line, wherein the method comprises: obtaining the current environmental parameters of the transmission line; obtaining the lateral wind load of the suspension insulator at the current moment based on the monitoring data of the plurality of pressure sensors; obtaining the initial wind deflection angle based on the current environmental parameters and the lateral wind load; obtaining the current current flowing through the suspension insulator to obtain the wind deflection angle correction value caused by the fine contact effect; obtaining the final online monitoring result of the wind deflection angle of the suspension insulator based on the initial wind deflection angle and the wind deflection angle correction value. The present invention has the advantages of real-time monitoring, remote monitoring, high-precision measurement, early warning function, data analysis and optimization, and cost saving.

Description

Technical Field

[0001] The invention belongs to the field of electric power detection, and in particular relates to an online monitoring method and system for wind deflection angle of suspension insulators of a transmission line. Background Art

[0002] Electricity is one of the most convenient and common energy sources in the world. Overhead transmission lines are the main means of power transmission and are of great significance to industrial production and life. When the wind acts on the transmission line, the component force perpendicular to the direction of the transmission line will cause the entire line to produce lateral displacement. Its swing amplitude mainly depends on the wind speed, insulator, weight of the transmission line and other factors. When the gap between the insulator string and the wire and the main material of the tower that swings to a certain angle is smaller than the normal operating electrical distance, breakdown discharge will occur. The construction of ultra-high voltage transmission lines is becoming more and more extensive and the number is increasing, and the wind deviation characteristics will be particularly prominent. Due to the generation of the wind deviation angle of the insulator string, it will cause phase-to-phase flashover and damage to metal clamps at the least, and cause serious accidents such as line tripping and power outage, pulling down the tower, and breaking the wire at the worst, resulting in significant economic losses.

[0003] As more and more large-span, high-voltage transmission lines are put into operation, from the actual operation situation, in order to effectively ensure the safe and stable operation of the transmission lines, the wind deflection monitoring of the insulator strings of the transmission lines must be done first. However, for a long time, when measuring the wind deflection of the suspension insulator strings on domestic transmission lines, wind deflection detectors are usually used, which have the problems of large size, easy damage, low accuracy, etc., and because the line is energized for a long time, under the action of wind, the conductor or insulator may vibrate, and these vibrations may be coupled with the characteristics of the line itself. If the fine contact effect causes the current on the conductor or insulator to be unevenly distributed, it may affect the vibration characteristics of the conductor or insulator, thereby affecting the wind deflection angle. However, the existing technology does not consider the influence of the fine contact effect on the wind deflection angle of the insulator. Therefore, the present invention proposes an online monitoring method and system for the wind deflection angle of the suspension insulator of the transmission line, which provides the necessary safety guarantee for the real-time and accurate detection of the wind deflection angle of the insulator string and the line maintenance and safe operation of the transmission line. Summary of the invention

[0004] In view of the defects existing in the above-mentioned prior art, the present invention provides an online monitoring method for the wind deflection angle of a suspension insulator of a transmission line, comprising the following steps:

[0005] Step S101, evenly arranging a plurality of pressure sensors on the surface of the suspension insulator;

[0006] Step S103, obtaining current environmental parameters of the transmission line, wherein the environmental parameters include wind direction, wind speed, initial atmospheric pressure and air density;

[0007] Step S105: acquiring the lateral wind load of the suspension insulator at the current moment based on the monitoring data of the plurality of pressure sensors;

[0008] Step S107, obtaining an initial wind deflection angle based on the current environmental parameters and the lateral wind load;

[0009] Step S109, obtaining the current flowing through the suspension insulator, and obtaining a windage angle correction value caused by a fine contact effect;

[0010] Step S1011: obtaining a final online monitoring result of the suspension insulator wind deflection angle based on the initial wind deflection angle and the wind deflection angle correction value.

[0011] Wherein, the step S105 includes obtaining the lateral wind load by the following formula: F_lat = ∫(P-P_0)dA

[0012] Where, Flat is the lateral wind load on the insulator, in Newtons.

[0013] P is the pressure distribution on the insulator surface, in Pascals,

[0014] P_0 is the initial atmospheric pressure, unit: Pascal,

[0015] dA is a tiny area element on the surface of the insulator, unit: square meter,

[0016] ∫ denotes integration over the entire insulator surface.

[0017] Wherein, step S1011 includes obtaining the final suspension insulator wind deflection angle based on the following formula:

[0018] α=(F_lat*L) / (C_d*A_p*ρ*V 2 )+Δα,

[0019] Where, α is the final suspension insulator wind deflection angle, unit: radian,

[0020] (F_lat*L) / (C_d*A_p*ρ*V 2 ) is the initial wind angle,

[0021] Δα represents the wind angle correction value caused by the fine contact effect,

[0022] F_lat is the lateral wind load on the insulator, unit: Newton,

[0023] L is the length of the insulator, unit: meter,

[0024] C_d is the resistance coefficient of the insulator, unitless,

[0025] A_p is the projected area of ​​the insulator on the plane perpendicular to the wind direction, unit: square meter, ρ is the air density, unit: kg / cubic meter,

[0026] V is wind speed, unit: meter / second.

[0027] The wind deflection angle correction value Δα caused by the fine contact effect is calculated by the following formula:

[0028] Δα=k*I 2 *L / (D 2 *V 2 ),

[0029] Where k is an empirical coefficient related to the thin contact effect, I is the current through the insulator, L is the length of the insulator, D is the characteristic dimension of the insulator, and V is the wind speed.

[0030] The pressure sensor is one or more of a resistive sensor, a piezoelectric sensor or a volumetric sensor.

[0031] Among them, the online monitoring results of the wind deflection angle of the suspension insulator are collected periodically.

[0032] Among them, the collected wind angle online monitoring results are transmitted to the management cloud platform via the LoRaWAN gateway using the LoRaWAN protocol.

[0033] The management cloud platform provides data analysis and visualization functions, and users can access real-time wind angle monitoring results through the management cloud platform.

[0034] When the monitoring result exceeds a predetermined threshold, an alarm message is sent to the user.

[0035] The present invention also proposes an online monitoring system for wind deflection angle of suspension insulators of transmission lines, characterized in that the system comprises:

[0036] Wind angle monitoring device, comprising:

[0037] A pressure sensor, which is used to collect the pressure on the surface of the suspension insulator;

[0038] An environmental parameter acquisition module, which is used to acquire current environmental parameters of the transmission line, wherein the environmental parameters include wind direction, wind speed, initial atmospheric pressure and air density;

[0039] A lateral wind load calculation module, which is used to obtain the lateral wind load of the suspension insulator at a current moment based on the monitoring data of the plurality of pressure sensors;

[0040] An initial wind deflection angle calculation module, which is used to obtain an initial wind deflection angle based on the current environmental parameters and the lateral wind load;

[0041] A correction module, which is used to obtain a wind deflection angle correction value caused by a fine contact effect based on a current flowing through the suspension insulator;

[0042] A result input module, which is used to obtain a final online monitoring result of the suspension insulator wind deflection angle based on the initial wind deflection angle and the wind deflection angle correction value;

[0043] A monitoring result collecting device, which is used to periodically collect online monitoring results of the wind deflection angle of the suspension insulator from the wind deflection angle monitoring device;

[0044] A transmission device, which is used to transmit the online monitoring results of the suspension insulator wind deflection angle collected by the monitoring result collection device to the management cloud platform through the LoRaWAN protocol;

[0045] The management cloud platform is used to provide users with real-time wind angle monitoring results, as well as data analysis and visualization interfaces.

[0046] Compared with the prior art, the present invention has the following advantages:

[0047] The online monitoring system can obtain wind angle data in real time and provide instant wind angle information, which enables the status of the transmission line to be sensed in time, so that corresponding measures can be taken quickly to deal with potential risks.

[0048] The monitoring system transmits data to the ground station or cloud platform via satellite communication, realizing remote monitoring function. Users can access monitoring data remotely at any time without having to visit the site in person. This greatly improves the convenience and efficiency of monitoring.

[0049] The online monitoring system uses wind speed sensors and tilt sensors to accurately measure wind angles in real time. Compared with traditional manual inspections or intermittent monitoring, the online monitoring system has higher accuracy and reliability.

[0050] The online monitoring system can analyze and process data through real-time monitoring data to identify potential risks and abnormal situations. Once the wind angle exceeds the preset threshold, the system can issue an early warning to remind relevant personnel to take necessary measures to avoid accidents.

[0051] The online monitoring system can collect a large amount of wind angle data and provide data analysis and optimization functions. Through the analysis of historical data, it can identify the risk hotspots and optimization potential of the line, guide maintenance and operation decisions, and improve the safety and reliability of the transmission line.

[0052] The online monitoring system can provide more accurate wind angle information, which helps optimize the design and maintenance plan of transmission lines. By timely detecting wind angle problems, the loss and risk of the line can be reduced, and the maintenance cost and accident handling cost can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] By reading the detailed description below with reference to the accompanying drawings, the above and other purposes, features and advantages of the exemplary embodiments of the present disclosure will become readily understood. In the accompanying drawings, several embodiments of the present disclosure are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0054] Figure 1 The present invention is a flowchart showing a method for online monitoring of wind deflection angle of suspension insulators of a transmission line according to an embodiment of the present invention. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0056] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings, and "multiple" generally includes at least two.

[0057] It should be understood that although the terms first, second, third, etc. may be used to describe ... in the embodiments of the present invention, these ... should not be limited to these terms. These terms are only used to distinguish .... For example, without departing from the scope of the embodiments of the present invention, the first ... may also be referred to as the second ..., and similarly, the second ... may also be referred to as the first ....

[0058] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0059] As used herein, the words "if" and "if" may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0060] It should also be noted that the term "includes", "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, so that a commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprising a ..." do not exclude the existence of other identical elements in the commodity or device including the elements.

[0061] The optional embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0062] like Figure 1 As shown, Embodiment 1 of the present invention discloses an online monitoring method for the wind deflection angle of a suspension insulator of a transmission line, comprising the following steps:

[0063] Step S101, evenly arranging a plurality of pressure sensors on the surface of the suspension insulator;

[0064] Step S103, obtaining current environmental parameters of the transmission line, wherein the environmental parameters include wind direction, wind speed, initial atmospheric pressure and air density;

[0065] Step S105: acquiring the lateral wind load of the suspension insulator at the current moment based on the monitoring data of the plurality of pressure sensors;

[0066] Step S107, obtaining an initial wind deflection angle based on the current environmental parameters and the lateral wind load;

[0067] Step S109, obtaining the current flowing through the suspension insulator, and obtaining a windage angle correction value caused by a fine contact effect;

[0068] Step S1011: obtaining a final online monitoring result of the suspension insulator wind deflection angle based on the initial wind deflection angle and the wind deflection angle correction value.

[0069] The method for online monitoring of wind deflection angle of suspension insulators of a transmission line proposed in Embodiment 2 of the present invention comprises the following steps:

[0070] Step S101, evenly arranging a plurality of pressure sensors on the surface of the suspension insulator;

[0071] Step S103, obtaining current environmental parameters of the transmission line, wherein the environmental parameters include wind direction, wind speed, initial atmospheric pressure and air density;

[0072] Step S105: acquiring the lateral wind load of the suspension insulator at the current moment based on the monitoring data of the plurality of pressure sensors;

[0073] Step S107, obtaining an initial wind deflection angle based on the current environmental parameters and the lateral wind load;

[0074] Step S109, obtaining the current flowing through the suspension insulator, and obtaining a windage angle correction value caused by a fine contact effect;

[0075] Step S1011: obtaining a final online monitoring result of the suspension insulator wind deflection angle based on the initial wind deflection angle and the wind deflection angle correction value.

[0076] Wherein, the step S105 includes obtaining the lateral wind load by the following formula: F_lat = ∫(P-P_0)dA

[0077] Where, Flat is the lateral wind load on the insulator, in Newtons.

[0078] P is the pressure distribution on the insulator surface, in Pascals,

[0079] P_0 is the initial atmospheric pressure, unit: Pascal,

[0080] dA is a tiny area element on the surface of the insulator, unit: square meter,

[0081] ∫ denotes integration over the entire insulator surface.

[0082] Wherein, step S1011 includes obtaining the final suspension insulator wind deflection angle based on the following formula:

[0083] α=(F_lat*L) / (C_d*A_p*ρ*V 2 )+Δα,

[0084] Where, α is the final suspension insulator wind deflection angle, unit: radian,

[0085] (F_lat*L) / (C_d*A_p*ρ*V 2 ) is the initial wind angle;

[0086] Δα represents the wind deflection angle correction value caused by the fine contact effect;

[0087] F_lat is the lateral wind load on the insulator, unit: Newton,

[0088] L is the length of the insulator, unit: meter,

[0089] C_d is the resistance coefficient of the insulator, unitless,

[0090] A_p is the projected area of ​​the insulator on the plane perpendicular to the wind direction, unit: square meter, ρ is the air density, unit: kg / cubic meter,

[0091] V is wind speed, unit: meter / second.

[0092] The present invention takes a prismatic insulator as an example, wherein the length of the prismatic insulator L can be defined as the length of the insulator along its axis. If it is a square prism, L is equal to the height (h) of the insulator. If it is a rectangular prism, L is equal to the height (h) of the insulator.

[0093] In one embodiment, the following steps are used to estimate the resistance coefficient C_d of the suspension insulator:

[0094] First, the suspension insulator needs to be geometrically modeled. This includes determining the actual geometry of the insulator, such as the outline of the insulator, the location of the suspension rope or rod, etc. Typically, a geometric model can be created using CAD software or other modeling tools.

[0095] The computational domain needs to be divided into small discrete units, i.e., meshes. The suspension insulator and the fluid domain around it are divided into three-dimensional meshes for numerical simulation. The density and detail of the mesh depends on the accuracy of the simulation and the availability of computing resources.

[0096] Select appropriate fluid medium and physical model according to actual conditions. For suspension insulators, air is generally considered as the fluid medium and a compressible flow model is used. As needed, turbulence models, boundary layer models, etc. can be considered to capture the behavior of the fluid.

[0097] Set appropriate boundary conditions, including the inlet boundary conditions and outlet boundary conditions of the fluid. The inlet boundary condition can be set to the velocity or pressure of the fluid, while the outlet boundary condition is usually set to free outflow or pressure outlet.

[0098] The fluid dynamics equations are solved using numerical methods and algorithms. The solution is converged to a stable solution through iterative calculations. This usually requires checking residuals, mesh independence, and convergence criteria during the calculation process.

[0099] After the simulation results obtain a stable solution, the total resistance of the suspension insulator can be calculated. Then, the resistance coefficient C_d can be obtained by dividing the total resistance by the dynamic pressure of the fluid medium (dynamic pressure = 0.5*ρ*V^2, where ρ is the air density and V is the fluid velocity).

[0100] The wind deflection angle correction value Δα caused by the fine contact effect is calculated by the following formula:

[0101] Δα=k*I 2 *L / (D 2 *V 2 ),

[0102] Where k is an empirical coefficient related to the fine contact effect, I is the current through the insulator, L is the length of the insulator, D is the characteristic dimension of the insulator (for example, side length or diameter), and V is the wind speed. Δα is the wind deflection correction value caused by the fine contact effect and is a dimensionless value.

[0103] Please note that Δα here is a correction value that can be obtained through experiments, simulations or empirical formulas to consider the additional correction of the wind angle due to the fine contact effect. This correction value Δα can be adjusted according to specific conditions and research data, so its value needs to be determined based on actual conditions. The final corrected wind angle will be in radians.

[0104] Wherein, the pressure sensor includes a resistive sensor, a piezoelectric sensor or a volumetric sensor.

[0105] Among them, resistive sensors (Strain Gauge Sensors): This type of sensor uses a strain gauge to measure the pressure change on the surface of the insulator. The resistance value of the strain gauge changes with the pressure, and the pressure value is determined by measuring the change in resistance value. For example, HBM P3MB series resistive pressure sensors are suitable for high temperature and high insulation strength environments.

[0106] Piezoelectric Sensors: Piezoelectric sensors use the piezoelectric effect to measure pressure changes. When pressure is applied to the surface of the insulator, the piezoelectric element generates a charge or voltage signal, thereby measuring the pressure. For example, the PCBPiezotronics piezoelectric sensor series provides products suitable for high temperature and high dielectric strength environments.

[0107] Capacitive Sensors: Capacitive sensors use changes in capacitance to measure pressure. When pressure is applied to the surface of the insulator, the capacitance value changes, and the pressure value is determined by measuring the change in capacitance value. For example, the Kistler 6150B series capacitive pressure sensor is suitable for high temperature and high insulation strength environments.

[0108] Among them, the online monitoring results of the wind deflection angle of the suspension insulator are collected periodically.

[0109] Among them, the collected wind angle online monitoring results are transmitted to the management cloud platform via the LoRaWAN gateway using the LoRaWAN protocol.

[0110] The management cloud platform provides data analysis and visualization functions, and users can access real-time wind angle monitoring results through the management cloud platform.

[0111] When the monitoring result exceeds a predetermined threshold, an alarm message is sent to the user.

[0112] Embodiment 3 of the present invention provides an online monitoring system for wind deflection angle of suspension insulators of a transmission line, which comprises:

[0113] Management cloud platform, which is used to provide users with real-time wind angle monitoring results, as well as data analysis and visualization interfaces;

[0114] A transmission device, which is used to transmit information to the management cloud platform via the LoRaWAN protocol;

[0115] A monitoring result collecting device, which is used to periodically send monitoring results;

[0116] Wind angle monitoring device, comprising:

[0117] A pressure sensor, which is used to collect the pressure on the surface of the suspension insulator;

[0118] An environmental parameter acquisition module, which is used to acquire current environmental parameters of the transmission line, wherein the environmental parameters include wind direction, wind speed, initial atmospheric pressure and air density;

[0119] A lateral wind load calculation module, which is used to obtain the lateral wind load of the suspension insulator at a current moment based on the monitoring data of the plurality of pressure sensors;

[0120] An initial wind deflection angle calculation module, which is used to obtain an initial wind deflection angle based on the current environmental parameters and the lateral wind load;

[0121] A correction module, which is used to obtain a wind deflection angle correction value caused by a fine contact effect based on a current flowing through the suspension insulator;

[0122] The result input module is used to obtain the final online monitoring result of the suspension insulator wind deflection angle based on the initial wind deflection angle and the wind deflection angle correction value.

[0123] Install wind angle monitoring devices on the transmission lines. The wind angle data collected by the monitoring equipment is collected and processed through the LoRaWAN communication device. The collected data can be compressed and encoded to reduce the amount of transmitted data. Deploy LoRaWAN gateways at appropriate locations to receive data from monitoring equipment. The LoRaWAN gateway forwards the received data to the next step. The LoRaWAN gateway transmits the data to the management cloud platform, which receives and processes the data. The data can be stored in the cloud database for further analysis and application. The management cloud platform provides data analysis and visualization functions, and users can access real-time wind angle monitoring results through the cloud platform. The data can be displayed in the form of charts or reports to support user decision-making and operations.

[0124] Embodiment 4 of the present invention provides a non-volatile computer storage medium, wherein the computer storage medium stores computer executable instructions, and the computer executable instructions can execute the method steps described in the above embodiments.

[0125] It should be noted that the computer-readable medium disclosed above may be a computer-readable signal medium or a computer-readable storage medium or any combination of the above two. The computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present disclosure, a computer-readable storage medium may be any tangible medium containing or storing a program that may be used by or in combination with an instruction execution system, device or device. In the present disclosure, a computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, in which a computer-readable program code is carried. This propagated data signal may take a variety of forms, including but not limited to an electromagnetic signal, an optical signal, or any suitable combination of the above. The computer readable signal medium may also be any computer readable medium other than a computer readable storage medium, which may send, propagate or transmit a program for use by or in conjunction with an instruction execution system, apparatus or device. The program code contained on the computer readable medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (radio frequency), etc., or any suitable combination of the above.

[0126] The computer-readable medium may be included in the electronic device, or may exist independently without being incorporated into the electronic device.

[0127] Computer program code for performing the operations of the present disclosure may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (AN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0128] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present disclosure. In this regard, each square box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some implementations as replacements, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two square boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0129] The units involved in the embodiments described in the present disclosure may be implemented by software or hardware, wherein the name of a unit does not, in some cases, limit the unit itself.

[0130] The above introduces the preferred embodiments of the present invention, which is intended to make the spirit of the present invention clearer and easier to understand, but is not intended to limit the present invention. All modifications, substitutions, and improvements made within the spirit and principles of the present invention should be included in the scope of protection outlined by the claims attached to the present invention.

Claims

1. A method for online monitoring of wind deflection angle of suspension insulators of transmission lines, characterized in that: The following steps are involved: Step S101, evenly arranging a plurality of pressure sensors on the surface of the suspension insulator; Step S103, obtaining current environmental parameters of the transmission line, wherein the environmental parameters include wind direction, wind speed, initial atmospheric pressure and air density; Step S105: acquiring the lateral wind load of the suspension insulator at the current moment based on the monitoring data of the plurality of pressure sensors; Step S107, obtaining an initial wind deflection angle based on the environmental parameters and the lateral wind load; Step S109, obtaining the current flowing through the suspension insulator, and obtaining a windage angle correction value caused by a fine contact effect; Step S1011, obtaining a final online monitoring result of the suspension insulator wind deflection angle based on the initial wind deflection angle and the wind deflection angle correction value; The step S105 includes obtaining the lateral wind load by the following formula: F_lat=∫(P-P_0)dA, where F_lat is the lateral wind load on the insulator, P is the pressure distribution on the insulator surface, P_0 is the initial atmospheric pressure, dA is a small area element on the insulator surface, and ∫ represents the integration of the entire insulator surface; Step S1011 includes obtaining a final suspension insulator wind deflection angle based on the following formula: α=(F_lat*L) / (C_d*A_p*ρ*V 2 )+Δα, where α is the final suspension insulator wind deflection angle, (F_lat*L) / (C_d*A_p*ρ*V 2 ) is the initial wind deflection angle, Δα is the wind deflection angle correction value caused by the fine contact effect, F_lat is the lateral wind load on the insulator, L is the length of the insulator, C_d is the drag coefficient of the insulator, A_p is the projected area of ​​the insulator on the plane perpendicular to the wind direction, ρ is the air density, and V is the wind speed; The windage angle correction value Δα caused by the fine contact effect is calculated by the following formula: Δα=k*I 2 *L / (D 2 *V 2 ), Where k is an empirical coefficient related to the thin contact effect, I is the current through the insulator, L is the length of the insulator, D is the characteristic dimension of the insulator, and V is the wind speed.

2. The method for online monitoring of wind deflection angle of suspension insulators of power transmission lines according to claim 1, characterized in that: The pressure sensor is one or more of a resistive sensor, a piezoelectric sensor or a volumetric sensor.

3. The method for online monitoring of wind deflection angle of suspension insulators of power transmission lines according to claim 1, characterized in that: Periodically collect online monitoring results of suspension insulator wind deflection angle.

4. The method for online monitoring of wind deflection angle of suspension insulators of power transmission lines according to claim 3, characterized in that: The collected wind angle online monitoring results are transmitted to the management cloud platform via the LoRaWAN gateway using the LoRaWAN protocol.

5. The method for online monitoring of wind deflection angle of suspension insulators of power transmission lines according to claim 3, characterized in that: The management cloud platform provides data analysis and visualization functions, and users access real-time wind angle monitoring results through the management cloud platform.

6. The method for online monitoring of wind deflection angle of suspension insulators of power transmission lines according to claim 1, characterized in that: When the monitoring result exceeds a predetermined threshold, an alarm message is sent to the user.

7. An online monitoring system for wind deflection angle of suspension insulators of power transmission lines, characterized in that: The system comprises: Wind angle monitoring device, comprising: A pressure sensor, which is used to collect the pressure on the surface of the suspension insulator; An environmental parameter acquisition module, which is used to acquire current environmental parameters of the transmission line, wherein the environmental parameters include wind direction, wind speed, initial atmospheric pressure and air density; A lateral wind load calculation module, which is used to obtain the lateral wind load of the suspension insulator at a current moment based on the monitoring data of the plurality of pressure sensors; An initial wind deflection angle calculation module, which is used to obtain an initial wind deflection angle based on the current environmental parameters and the lateral wind load; A correction module, which is used to obtain a wind deflection angle correction value caused by a fine contact effect based on a current flowing through the suspension insulator; A result input module, which is used to obtain a final online monitoring result of the suspension insulator wind deflection angle based on the initial wind deflection angle and the wind deflection angle correction value; A monitoring result collecting device, which is used to periodically collect online monitoring results of the wind deflection angle of the suspension insulator from the wind deflection angle monitoring device; A transmission device, which is used to transmit the online monitoring results of the suspension insulator wind deflection angle collected by the monitoring result collection device to the management cloud platform through the LoRaWAN protocol; Management cloud platform, which is used to provide users with real-time wind angle monitoring results, as well as data analysis and visualization interfaces; The lateral wind load calculation module obtains the lateral wind load through the following formula: F_lat=∫(P-P_0)dA, where F_lat is the lateral wind load on the insulator, P is the pressure distribution on the insulator surface, P_0 is the initial atmospheric pressure, dA is a small area element on the insulator surface, and ∫ represents the integration of the entire insulator surface; The result input module obtains the final suspension insulator wind deflection angle based on the following formula: α=(F_lat*L) / (C_d*A_p*ρ*V 2 )+Δα, where α is the final suspension insulator wind deflection angle, (F_lat*L) / (C_d*A_p*ρ*V 2 ) is the initial wind deflection angle, Δα is the wind deflection angle correction value, F_lat is the lateral wind load on the insulator, L is the length of the insulator, C_d is the drag coefficient of the insulator, A_p is the projected area of ​​the insulator on the plane perpendicular to the wind direction, ρ is the air density, and V is the wind speed; The correction module calculates the wind angle correction value Δα caused by the fine contact effect using the following formula: Δα=k*I 2 *L / (D 2 *V 2 ), Where k is an empirical coefficient related to the thin contact effect, I is the current through the insulator, L is the length of the insulator, D is the characteristic dimension of the insulator, and V is the wind speed.

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