Lightning strike wire damage analysis method, device, equipment and storage medium

Abstract

The present invention discloses a method, device, equipment and storage medium for analyzing damage to a wire caused by lightning. The method comprises: obtaining the pole tower coordinates, the fault time and the lightning activity information within a preset range of the pole tower coordinates of a faulty pole tower in a line to be analyzed; obtaining target lightning strike information from the lightning activity information according to the fault time; constructing a finite element model based on the line information and the target lightning strike information of the line to be analyzed; simulating the wire damage process when the faulty pole tower is struck by lightning according to the finite element model; and performing wire damage analysis on the faulty pole tower based on the simulation result; because the present invention locates the lightning strike activity, constructs the finite element model based on the target lightning strike information and the line information, and effectively simulates the wire damage during the lightning strike based on the finite element model, the accurate analysis of the line lightning strike damage is achieved without conducting on-site tests and measurements, which greatly improves the wire damage analysis efficiency and reduces the analysis cost.

Description

Technical Field

[0001] The present invention relates to the field of electric power technology, and in particular to a method, device, equipment and storage medium for analyzing damage caused by lightning strike on a conductor. Background Art

[0002] With the progress of society and the development of science, people's demand for electricity in life and work has gradually increased. As an important part of the power supply process, the safety of distribution lines is crucial to the stable operation of the power supply system. Lightning activity is one of the main causes of distribution line failures. For low-voltage distribution lines, due to their low insulation level, they are extremely susceptible to lightning damage, and at the same time, they will be harmed by induced lightning during operation. At present, the analysis and assessment of conductor damage requires field surveys and field tests. Based on the data collected on site, field tests are carried out to analyze the damage to the conductors. Therefore, the current conductor loss analysis efficiency is low, the analysis cost is high, and the timeliness is poor, resulting in the inability to timely and effectively assess the damage to the line. Summary of the invention

[0003] The main purpose of the present invention is to provide a method, device, equipment and storage medium for analyzing lightning strike wire damage, aiming to solve the technical problems in the prior art that the wire loss analysis efficiency is low, the analysis cost is high, the timeliness is poor, and the line damage cannot be evaluated in a timely and effective manner.

[0004] To achieve the above object, the present invention provides a method for analyzing lightning-struck wire damage, the method comprising the following steps:

[0005] Obtaining the tower coordinates of the faulty tower in the line to be analyzed, the fault time, and the lightning activity information within a preset range where the tower coordinates are located;

[0006] acquiring target lightning strike information from the lightning activity information according to the fault moment;

[0007] Constructing a finite element model based on the line information of the line to be analyzed and the target lightning strike information, wherein the finite element model includes the conductor, the insulator string and the tower cross arm of the faulty tower;

[0008] The wire damage process when the faulty pole tower is struck by lightning is simulated according to the finite element model, and the wire damage analysis of the faulty pole tower is performed based on the simulation result.

[0009] Optionally, constructing a finite element model based on the line information of the line to be analyzed and the target lightning strike information includes:

[0010] Constructing a physical model of a lightning strike transient process based on the target lightning strike information and the line information of the line to be analyzed;

[0011] Acquire insulation flashover information of the faulty tower according to the physical model of the lightning transient process;

[0012] A finite element model is constructed based on the line information and the insulation flashover information.

[0013] Optionally, the line information includes: insulator string model, actual tower height, conductor hanging point height, conductor geometric center distance, ground hanging point height and ground wire geometric center distance;

[0014] The constructing of a lightning strike transient process physical model based on the target lightning strike information and the line information of the line to be analyzed includes:

[0015] Establishing a multi-wave impedance model based on the actual tower height;

[0016] Construct an overhead line model according to the conductor hanging point height, the conductor geometric center distance, the ground hanging point height and the ground wire geometric center distance;

[0017] Obtaining the insulator string volt-second characteristic parameter of the faulty tower based on the insulator string model;

[0018] Acquiring flashover characterization information of the insulator string according to the volt-second characteristic parameter of the insulator string;

[0019] A physical model of a lightning strike transient process is constructed based on the target lightning strike information, the multi-wave impedance model, the overhead line model and the insulator string flashover characterization information.

[0020] Optionally, the line information further includes: tower grounding resistance, height of lightning arrester to the ground, and height of conductor to the ground;

[0021] The constructing of a lightning transient process physical model based on the target lightning strike information, the multi-wave impedance model, the overhead line model and the insulator string flashover characterization information comprises:

[0022] Acquiring lightning current waveform information based on the target lightning strike information;

[0023] Determining an induced overvoltage coefficient according to the lightning current waveform information;

[0024] Determine a simulated induced voltage based on the induced overvoltage coefficient, the height of the lightning conductor to the ground, and the height of the conductor to the ground;

[0025] A physical model of a lightning transient process is constructed according to the tower grounding resistance, the simulated induced voltage, the multi-wave impedance model, the overhead line model and the insulator string flashover characterization information.

[0026] Optionally, simulating a wire damage process when the faulty tower is struck by lightning according to the finite element model, and performing wire damage analysis on the faulty tower based on the simulation result includes:

[0027] Perform arc wire contact simulation based on the finite element model to determine the arc wire contact point of the faulty tower;

[0028] Simulating the temperature change of the arc wire contact point according to the physical model of the lightning transient process to obtain temperature change information;

[0029] Obtaining material melting point information of the faulty tower;

[0030] Determine a damaged area of ​​the conductor according to the temperature change information and the material melting point information;

[0031] Conductor damage analysis is performed on the damaged area of ​​the conductor based on the temperature change information.

[0032] Optionally, simulating the temperature change of the arc wire contact point according to the physical model of the lightning transient process to obtain the temperature change information includes:

[0033] Obtain impulse current arc information and power frequency follow-current arc information based on the physical model of lightning transient process;

[0034] Constructing an arc channel thermal model based on the impulse current arc information and the power frequency follow-current arc information;

[0035] The temperature change of the arc wire contact point is simulated based on the arc channel thermal model to obtain temperature change information.

[0036] Optionally, simulating the temperature change of the arc wire contact point based on the arc channel thermal model to obtain temperature change information includes:

[0037] Acquiring lightning impulse current information according to the physical model of the lightning transient process;

[0038] Determine a voltage drop parameter per unit arc length based on the arc channel thermal model and the lightning impulse current information;

[0039] Obtain the insulator string structure information of the faulty tower;

[0040] Determining arc length based on the insulator string structure information;

[0041] Determine the arc overall voltage drop parameter according to the arc length and the unit arc length voltage drop parameter;

[0042] The temperature change of the arc wire contact point is simulated based on the arc overall voltage drop parameter to obtain temperature change information.

[0043] In addition, to achieve the above-mentioned purpose, the present invention also provides a lightning-struck wire damage analysis device, the lightning-struck wire damage analysis device comprising:

[0044] An information acquisition module is used to obtain the tower coordinates of the faulty tower in the line to be analyzed, the fault time, and the lightning activity information within a preset range where the tower coordinates are located;

[0045] A lightning strike analysis module, used for acquiring target lightning strike information from the lightning activity information according to the fault moment;

[0046] A finite element model building module, used to build a finite element model based on the line information of the line to be analyzed and the target lightning strike information, wherein the finite element model includes the conductor, insulator string and tower cross arm of the fault tower;

[0047] The conductor damage analysis module is used to simulate the conductor damage process when the faulty pole tower is struck by lightning according to the finite element model, and perform conductor damage analysis on the faulty pole tower based on the simulation results.

[0048] In addition, to achieve the above-mentioned purpose, the present application also proposes a lightning strike wire damage analysis device, which includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, and the computer program is configured to implement the steps of the lightning strike wire damage analysis method as described above.

[0049] In addition, to achieve the above objectives, the present application also proposes a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the lightning conductor damage analysis method as described above are implemented.

[0050] The present invention obtains the tower coordinates of the fault tower in the line to be analyzed, the fault time and the lightning activity information within a preset range where the tower coordinates are located, obtains the target lightning strike information from the lightning activity information according to the fault time, builds a finite element model based on the line information of the line to be analyzed and the target lightning strike information, the finite element model includes the conductor, insulator string and tower cross arm of the faulty tower, simulates the conductor damage process when the faulty tower is struck by lightning according to the finite element model, and performs conductor damage analysis on the faulty tower based on the simulation result; because the present invention locates the lightning strike activity, builds the finite element model based on the target lightning strike information and the line information, and effectively simulates the conductor damage during the lightning strike based on the finite element model, the accurate analysis of the line lightning strike damage is achieved without conducting on-site tests and measurements, the timeliness of the analysis is ensured, the efficiency of the conductor damage analysis is greatly improved, and the analysis cost is effectively reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0052] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0053] Figure 1 It is a structural schematic diagram of a lightning conductor damage analysis device in a hardware operating environment involved in an embodiment of the present invention;

[0054] Figure 2 It is a flow chart of the first embodiment of the method for analyzing the damage of a wire struck by lightning of the present invention;

[0055] Figure 3 It is a schematic diagram of the structure of the conductor damage analysis principle in the first embodiment of the method for analyzing conductor damage caused by lightning strike of the present invention;

[0056] Figure 4 It is a flow chart of a second embodiment of the method for analyzing damage to a wire caused by lightning strike of the present invention;

[0057] Figure 5 This is a structural block diagram of the first embodiment of the lightning strike wire damage analysis device of the present invention.

[0058] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0059] 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.

[0060] Reference Figure 1 , Figure 1 The present invention is a schematic diagram of the structure of a lightning conductor damage analysis device in a hardware operating environment according to an embodiment of the present invention.

[0061] like Figure 1 As shown, the lightning wire damage analysis device may include: a processor 1001, such as a central processing unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Among them, the communication bus 1002 is used to realize the connection and communication between these components. The user interface 1003 may include a display screen (Display), an input unit such as a keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface and a wireless interface. The network interface 1004 may optionally include a standard wired interface and a wireless interface (such as a wireless fidelity (Wireless-Fidelity, WI-FI) interface). The memory 1005 may be a high-speed random access memory (Random Access Memory, RAM), or a stable non-volatile memory (Non-Volatile Memory, NVM), such as a disk storage. The memory 1005 may also be a storage device independent of the aforementioned processor 1001.

[0062] Those skilled in the art will understand that Figure 1 The structure shown in the figure does not constitute a limitation on the lightning wire damage analysis device, and may include more or less components than those shown in the figure, or combine certain components, or arrange the components differently.

[0063] like Figure 1 As shown, the memory 1005 as a computer-readable storage medium may include an operating system, a network communication module, a user interface module, and a lightning conductor damage analysis program.

[0064] exist Figure 1 In the lightning wire damage analysis device shown, the network interface 1004 is mainly used for data communication with the network server; the user interface 1003 is mainly used for data interaction with the user; the processor 1001 and the memory 1005 in the lightning wire damage analysis device of the present invention can be set in the lightning wire damage analysis device, and the lightning wire damage analysis device calls the lightning wire damage analysis program stored in the memory 1005 through the processor 1001, and executes the lightning wire damage analysis method provided by the embodiment of the present invention.

[0065] The embodiment of the present invention provides a method for analyzing the damage of a lightning-struck conductor. Figure 2 , Figure 2 It is a flow chart of the first embodiment of the method for analyzing damage to a wire struck by lightning of the present invention.

[0066] In this embodiment, the lightning strike wire damage analysis method includes the following steps:

[0067] Step S10: obtaining the tower coordinates of the faulty tower in the line to be analyzed, the fault time, and the lightning activity information within a preset range where the tower coordinates are located.

[0068] It should be noted that the present embodiment is applied to the scenario where the distribution line conductor is damaged due to lightning strikes caused by lightning hazards. The present embodiment locates the lightning strike activity, constructs a finite element model based on the target lightning strike information and the line information, and effectively simulates the wire damage during the lightning strike based on the finite element model. Without conducting on-site tests and measurements, accurate analysis of line lightning damage is achieved, the timeliness of the analysis is ensured, the efficiency of wire damage analysis is greatly improved, and the analysis cost is effectively reduced.

[0069] It should be understood that the execution subject of this embodiment can be a computing service device with data processing, network communication and program running functions, such as a tablet computer, a personal computer, a mobile phone, etc., or a terminal electronic device capable of realizing the above functions, etc. The following takes the lightning wire damage analysis device (hereinafter referred to as the analysis device) as an example to illustrate this embodiment and the following embodiments.

[0070] It should be noted that the line to be analyzed may be a line that is damaged by lightning. The above-mentioned faulty pole tower may be a pole tower that is damaged by lightning in the line to be analyzed. The above-mentioned pole tower coordinates may be the longitude and latitude coordinates of the faulty pole tower. The above-mentioned fault time may be the time when the faulty pole tower is monitored to have a fault or anomaly.

[0071] It should be noted that the lightning activity information may be information related to lightning activities in the area or minefield where the faulty tower is located, for example, radar activity information may be the time of lightning strike, number of lightning strikes and lightning strike coordinates in the minefield where the faulty tower is located. The above-mentioned preset range may be a preset distance range where lightning strikes may affect the tower, for example, the preset range may be a 1 km range centered on the tower, and lightning strike activities within a 1 km range from the tower may cause the tower to fail.

[0072] It should be understood that the analysis equipment obtains the tower coordinates and fault time of the faulty tower in the line to be analyzed, and obtains lightning activity information within a preset range of the faulty tower by querying the lightning location system (for example, querying radar activity information within 1 km of the faulty tower).

[0073] Step S20: acquiring target lightning strike information from the lightning activity information according to the fault moment.

[0074] It should be noted that the target lightning strike information may be the lightning strike information of a lightning strike activity within a preset range whose lightning strike moment is closest to the fault moment of the faulty tower.

[0075] It can be understood that this embodiment determines the lightning strike activities within a preset range where the faulty tower is located based on the lightning activity information, and obtains the lightning strike information of each lightning strike activity, determines the lightning strike time of each lightning strike activity based on the lightning strike information, selects the lightning strike activity whose lightning strike time is closest to the fault time as the target lightning strike activity that causes the tower failure, and uses the lightning strike information of the target lightning strike activity as the target lightning strike information.

[0076] For example, three lightning strikes occurred within the preset range of the faulty tower, and the lightning strike time of the second lightning strike was closest to the fault time, and the lightning activity information of the second lightning strike was used as the target lightning strike information.

[0077] In some embodiments, the analysis device combines the coordinates of the faulty tower and queries the lightning activity information within 1 km of the faulty tower in the lightning positioning system, and selects the lightning strike information of the lightning strike closest to the tower at the time of the fault as the target lightning strike information of the lightning fault process.

[0078] Step S30: constructing a finite element model based on the line information of the line to be analyzed and the target lightning strike information.

[0079] It should be noted that the finite element model includes the conductor, insulator string and tower cross arm of the faulty tower. The above line information may be the basic line information of the line to be analyzed, for example, the line information may include the conductor model, the span on both sides of the faulty pole, the conductor hanging point height, the conductor geometric center distance, the ground wire hanging point height, the ground wire geometric center distance, the tower longitude and latitude, the tower grounding resistance, the tower height, the insulator string model and other data.

[0080] It is understandable that this embodiment can construct finite element models of the conductor, insulator string, and tower crossarm based on the structural information and material information of the conductor, insulator string, and tower crossarm in the line information and in combination with the target lightning strike information.

[0081] Step S40: simulating the wire damage process when the faulty tower is struck by lightning according to the finite element model, and performing wire damage analysis on the faulty tower based on the simulation result.

[0082] It should be noted that the simulation result can be the result of simulating the temperature change of the conductor at the arc contact point in the finite element model. Based on the simulation result, the transient process of the temperature change of the faulty tower conductor is analyzed to achieve accurate analysis of the conductor damage.

[0083] It should be noted that, in this embodiment, the conductors and related structures of the faulty pole tower are divided into multiple interconnected units through finite element analysis, and the physical behavior of each unit can be described by a finite element model. By applying appropriate boundary conditions and loads (such as lightning current waveforms), the simulation of lightning strike events is achieved, and the stress, strain, temperature distribution and other related parameters of the conductor are calculated, thereby achieving the conductor damage analysis of the faulty pole tower.

[0084] Furthermore, in order to accurately perform damage analysis on the damaged area of ​​the conductor, the above step S40 may include:

[0085] Step S401: performing arc conductor contact simulation based on the finite element model to determine the arc conductor contact point of the faulty tower.

[0086] It is understandable that the analysis equipment can simulate the contact between the arc and the conductor during the lightning strike based on the finite element model to locate the contact point between the power source and the conductor.

[0087] Step S402: simulating the temperature change of the arc wire contact point according to the physical model of the lightning transient process to obtain temperature change information.

[0088] It is understandable that the analysis equipment can perform thermal simulation on the arc wire contact point based on the physical model of the lightning transient process. Assuming that the energy of the arc is converted into heat, the arc heating power can be calculated according to P=UI, thereby obtaining temperature change information.

[0089] Furthermore, in order to accurately simulate the temperature change of the conductor, the above step S402 may include:

[0090] Step S4021: acquiring impulse current arc information and power frequency follow-current arc information according to a physical model of a lightning transient process;

[0091] Step S4022: constructing an arc channel thermal model based on the impulse current arc information and the power frequency follow-current arc information;

[0092] Step S4023: Simulate the temperature change of the arc wire contact point based on the arc channel thermal model to obtain temperature change information.

[0093] It should be noted that impulse current arcs can be caused by transient overvoltage events such as lightning strikes. Arcs are electric currents with a fast rise rate, high amplitude, but relatively short duration. In a lightning strike, when the lightning current passes through an insulator or other insulating medium, if the voltage exceeds the tolerance limit of the material, an arc will form on the surface of the insulator or in the gap, resulting in abnormal current flow.

[0094] It should be noted that the power frequency continuous current arc refers to the arc formed by the current not being interrupted immediately after a fault (such as a short circuit) occurs in the power system due to the presence of inductance components in the system, but continuing to flow at the fault point. This type of arc is characterized by a low current amplitude but a long duration, usually synchronized with the power frequency voltage of the system.

[0095] It can be understood that this embodiment constructs an arc channel thermal model to simulate and analyze the thermal behavior of the arc as it propagates in the channel, taking into account the thermal characteristics, electromagnetic characteristics, and fluid dynamic characteristics of the arc, thereby realizing the prediction and analysis of physical quantities such as temperature, pressure, and velocity field in the arc channel, effectively simulating the temperature changes at the contact points of the arc wires, and obtaining temperature change information.

[0096] Furthermore, in order to accurately analyze the temperature change of the contact point, the above step S4023 may include:

[0097] Acquiring lightning impulse current information according to the physical model of the lightning transient process;

[0098] Determine a voltage drop parameter per unit arc length based on the arc channel thermal model and the lightning impulse current information;

[0099] Obtain the insulator string structure information of the faulty tower;

[0100] Determining arc length based on the insulator string structure information;

[0101] Determine the arc overall voltage drop parameter according to the arc length and the unit arc length voltage drop parameter;

[0102] The temperature change of the arc wire contact point is simulated based on the arc overall voltage drop parameter to obtain temperature change information.

[0103] It should be noted that the lightning impulse current information may include the lightning impulse current amplitude and the lightning impulse current waveform.

[0104] It can be understood that the voltage drop per unit arc length decreases as the current amplitude increases. The voltage drop per unit arc length can be expressed as a function related to the current amplitude:

[0105]

[0106] Among them, V s is the voltage drop parameter per unit arc length; V s0 is a constant coefficient, such as V S0 It can be 75V / cm; n is a variable, for example, n can be 0.4; I S is the lightning impulse current amplitude.

[0107] For a stable burning arc, the input energy in the arc gap is equal to the dissipated energy. At this time, the overall arc conductivity is expressed by the following formula:

[0108]

[0109] Among them, G S is the overall arc conductivity, i is the arc current; V s is the voltage drop per unit arc length, in V / cm; l is the arc length, in centimeters (cm).

[0110] Therefore, the overall arc voltage drop parameter U S for:

[0111]

[0112] Among them, V s is the voltage drop parameter per unit arc length, U S is the overall arc voltage drop parameter, and l is the arc length.

[0113] For example, assuming that the energy of the arc is converted into heat, the arc heating power can be calculated according to P=UI, and the heat can be evenly distributed in the discharge arc channel with a length of l and a radius of r.

[0114] Step S403: Obtaining the material melting point information of the faulty tower.

[0115] It is understandable that the analysis device may obtain the melting point information of the conductor material of the faulty tower based on the conductor material characteristics of the faulty tower, thereby determining the melting point threshold of the conductor material.

[0116] Step S404: determining a damaged area of ​​the wire according to the temperature change information and the material melting point information.

[0117] It is understandable that the analysis equipment can use finite elements to simulate the temperature changes at the contact points of the arc wires, and identify the areas where the temperature exceeds the melting point of the material as the wire damage areas.

[0118] Step S405: performing a wire damage analysis on the wire damaged area based on the temperature change information.

[0119] It can be understood that the analysis device simulates the temperature change of the flashover point based on the temperature change information and the damaged area of ​​the conductor, so as to analyze the area of ​​damage to the lightning-struck conductor and determine whether the conductor is broken.

[0120] In some embodiments, reference Figure 3 , Figure 3This is a schematic diagram of the principle structure of conductor damage analysis. The analysis equipment analyzes the lightning impulse current waveform according to the tower structure and electrical parameters, the conductor structure and electrical parameters, and the grounding resistance. The flashover situation is analyzed based on the lightning impulse current waveform and combined with the line electromagnetic transient model and the insulator physical model. The arc heat channel is constructed based on the flashover situation. The arc temperature, conductor melting point and burning time are determined based on the arc heat channel. The conductor damage is analyzed according to the arc temperature, conductor melting point and burning time. Among them, the line electromagnetic transient model is composed of multiple line unit models. The line unit may include a lightning current model, a three-phase voltage, an insulator model, a tower wave impedance model and a node resistance model.

[0121] In this embodiment, the tower coordinates of the fault tower in the line to be analyzed, the fault time, and the lightning activity information within a preset range where the tower coordinates are located are obtained, and the target lightning strike information is obtained from the lightning activity information according to the fault time. A finite element model is constructed based on the line information of the line to be analyzed and the target lightning strike information. The finite element model includes the conductor, insulator string, and tower cross arm of the faulty tower. The conductor damage process when the faulty tower is struck by lightning is simulated according to the finite element model, and the conductor damage analysis of the faulty tower is performed based on the simulation result. Since this embodiment locates the lightning strike activity, constructs a finite element model based on the target lightning strike information and line information, and effectively simulates the conductor damage during the lightning strike based on the finite element model, the accurate analysis of the line lightning strike damage is achieved without conducting on-site tests and measurements, ensuring the timeliness of the analysis, greatly improving the efficiency of the conductor damage analysis, and effectively reducing the analysis cost.

[0122] refer to Figure 4 , Figure 4 Schematic diagram of the flow of the second embodiment of the method for analyzing damage to a wire struck by lightning of the present invention.

[0123] Based on the above first embodiment, in this embodiment, step S30 further includes:

[0124] Step S301: constructing a physical model of a lightning strike transient process based on the target lightning strike information and the line information of the line to be analyzed.

[0125] It should be noted that the physical model of the lightning transient process may be a model for simulating and analyzing the electromagnetic transient response of a transmission line in a lightning strike event.

[0126] It can be understood that this embodiment constructs components such as conductors, poles, insulator strings, and grounding systems based on line information, and constructs a physical model of the lightning transient process based on the target lightning strike information combined with the injection, propagation, and attenuation processes of the lightning current, thereby evaluating the impact of lightning strikes on transmission lines and analyzing insulator flashover conditions.

[0127] Furthermore, in order to accurately construct a physical model of the lightning transient process and improve the accuracy of lightning simulation analysis, the above step S301 may include:

[0128] Step S3011: Establish a multi-wave impedance model based on the actual tower height.

[0129] It should be noted that the line information includes: insulator string model, actual tower height, conductor hanging point height, conductor geometric center distance, ground hanging point height and ground wire geometric center distance.

[0130] It should be noted that the multi-wave impedance model can be a model used for lightning transient response analysis of transmission lines and faulty towers.

[0131] It can be understood that this embodiment can construct a multi-wave impedance model to subdivide different parts of the faulty tower (such as the main frame, crossarms, diagonal materials, etc.) into multiple wave impedance segments, thereby more accurately simulating the propagation, reflection and refraction process of lightning waves in the tower.

[0132] Step S3012: construct an overhead line model according to the conductor hanging point height, the conductor geometric center distance, the ground hanging point height and the ground wire geometric center distance.

[0133] It should be noted that the overhead line model can be a mathematical model used to describe and analyze the physical characteristics and electrical behavior of overhead transmission lines. The overhead line model may include geometric parameters, electrical parameters, and environmental factors of the line to be analyzed, and can be used to simulate and predict the performance of overhead lines under different conditions, and to analyze the response to transient events such as lightning strikes.

[0134] In some embodiments, the analysis device can construct a geometric model based on line structure information and tower structure information such as conductor hanging point height, conductor geometric center distance, ground hanging point height and ground wire geometric center distance, and assign material properties, boundary conditions and load application to the geometric model based on line material information and tower material information, obtain an initial model, mesh the initial model, discretize the continuous structure into a finite number of units and nodes, and thus construct an overhead line model.

[0135] Step S3013: Obtain the volt-second characteristic parameters of the insulator string of the faulty tower based on the insulator string model.

[0136] It should be noted that the volt-second characteristic parameters of the insulator string may be parameters that describe the breakdown characteristics of the insulator string under different voltage and time conditions. For example, the volt-second characteristic parameters of the insulator string may include the breakdown voltage, breakdown time, volt-second characteristic curve, withstand voltage level, flashover voltage, flashover current and other parameters of the insulator.

[0137] It can be understood that, in this embodiment, the volt-second characteristic parameter of the insulator string can be obtained by querying a preset model mapping table based on the insulator string model.

[0138] Step S3014: Obtain flashover characterization information of the insulator string according to the volt-second characteristic parameters of the insulator string.

[0139] It is understandable that the analysis device can characterize the insulator flashover condition based on the insulator string volt-second characteristic parameters, insulator material characteristics, and insulator structural characteristics to obtain the insulator string flashover characterization information.

[0140] Step S3015: constructing a physical model of the lightning transient process based on the target lightning strike information, the multi-wave impedance model, the overhead line model and the insulator string flashover characterization information.

[0141] It can be understood that the analysis equipment can obtain parameters such as lightning strike frequency, lightning current waveform and amplitude based on the target lightning strike information, perform electromagnetic transient simulation based on the multi-wave impedance model, overhead line model and insulator string flashover characterization information, and construct a physical model of the lightning strike transient process, thereby realizing the simulation and analysis of the electromagnetic transient response of the faulty tower in the lightning strike event.

[0142] Further, in order to accurately simulate the electromagnetic transient response process of the faulty tower in a lightning strike event, the above step S3015 may include:

[0143] S30151: Acquire lightning current waveform information based on the target lightning strike information;

[0144] S30152: Determine an induced overvoltage coefficient according to the lightning current waveform information;

[0145] S30153: Determine a simulated induced voltage based on the induced overvoltage coefficient, the height of the lightning protection wire to the ground, and the height of the conductor to the ground;

[0146] S30154: Constructing a physical model of a lightning transient process according to the tower grounding resistance, the simulated induced voltage, the multi-wave impedance model, the overhead line model and the insulator string flashover characterization information.

[0147] It should be noted that the line information also includes: tower grounding resistance, height of lightning arrester to ground and height of conductor to ground. The tower grounding resistance can be determined by measurement, and the tower grounding resistance can be characterized by a power frequency resistance element.

[0148] It should be noted that the lightning current waveform information may be lightning impulse current waveform information, for example, the lightning current waveform information may include lightning current amplitude and waveform.

[0149] In some embodiments, the analysis device may characterize the lightning current waveform based on the Surge model, which is expressed as:

[0150]

[0151] Among them, Amp is the current peak value, u represents the lightning current waveform, A = -1 / T1, B = -1 / T2, T1 is the wave tail time constant, T2 is the wave head time constant, and the wave head time constant and the wave tail time constant determine the time for the current to rise and decay. The wave head time constant refers to the time required for the lightning current to rise from zero to the peak value, usually expressed as the wave front time, while the wave tail time constant refers to the time required for the lightning current to fall from the peak value to half.

[0152] In some embodiments, the analysis device may simulate the induced voltage u based on the following formula: i :

[0153]

[0154] Among them, h g is the height of the lightning conductor above the ground, h c is the height of the conductor above the ground, in meters; a is the induced overvoltage coefficient, which is the steepness of the lightning current in kA / μs and is determined based on the actual waveform; k0 is the geometric coupling coefficient between the conductor and the lightning arrester and is determined based on the tower type of different towers.

[0155] Step S302: obtaining insulation flashover information of the faulty tower according to the physical model of the lightning transient process.

[0156] It should be noted that the insulation flashover information may be related information of the insulator flashover condition and the conductor flashover condition. For example, the insulation flashover information may include information such as the flashover voltage, the flashover current, the flashover path, and the surface condition of the insulator.

[0157] It is understandable that the analysis equipment can query the volt-second characteristics of the insulator string based on the insulator string model of the faulty tower, analyze the insulator flashover situation based on the volt-second characteristics of the insulator string and the physical model of the lightning transient process, and obtain insulation flashover information.

[0158] Step S303: constructing a finite element model based on the line information and the insulation flashover information.

[0159] It can be understood that the analysis equipment can obtain the structural information and material information of the structural components related to the faulty tower based on the material information, and construct a finite element model of the conductor, insulator string and tower crossarm based on the structural information and material information as well as the insulation flashover information, so as to perform finite element analysis through the finite element model.

[0160] In some embodiments, the analysis device can obtain structural information and material information of the conductors, insulator strings and poles based on the line information, create geometric models of the poles, conductors and insulator strings based on the structural information, assign material properties to each component in the geometric model based on the material information, define the boundary conditions of the geometric model (for example, fix the foundation of the pole or apply prestress. Apply loads such as tension of the conductor, load of the insulator string, etc.), mesh the geometric model, discretize the continuous structure into a finite number of units and nodes, and thus obtain a finite element model.

[0161] This embodiment constructs a physical model of a lightning strike transient process based on the target lightning strike information and the line information of the line to be analyzed, obtains the insulation flashover information of the faulty tower according to the physical model of the lightning strike transient process, and constructs a finite element model based on the line information and the insulation flashover information, thereby simulating the electromagnetic transient response in the lightning strike event, effectively analyzing the insulation flashover situation in the lightning strike event, and accurately constructing a finite element model in combination with the insulation flashover information and the line information, ensuring the model accuracy, improving the accuracy of the finite element analysis, and effectively avoiding the error in the conductor loss analysis.

[0162] In addition, an embodiment of the present invention further proposes a computer-readable storage medium, on which a lightning-struck wire damage analysis program is stored. When the lightning-struck wire damage analysis program is executed by a processor, the steps of the lightning-struck wire damage analysis method described above are implemented.

[0163] The computer-readable storage medium provided in the present application may be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, systems or devices, 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: Random Access Memory), a read-only memory (ROM: Read Only Memory), an erasable programmable read-only memory (EPROM: Erasable Programmable Read Only Memory or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM: CD-Read Only Memory), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program, which may be used by or in combination with an instruction execution system, system or device. The program code contained on the computer-readable storage medium may be transmitted using any appropriate medium, including but not limited to: wires, optical cables, RF (Radio Frequency: Radio Frequency), etc., or any suitable combination of the above.

[0164] The computer-readable storage medium may be included in the lightning-struck wire damage analysis device; or may exist independently without being assembled into the lightning-struck wire damage analysis device.

[0165] In addition, an embodiment of the present invention further provides a computer program product, including a lightning-struck wire damage analysis program, which implements the steps of the lightning-struck wire damage analysis method described above when executed by a processor.

[0166] The specific implementation of the computer program product of the present invention is basically the same as the embodiments of the above-mentioned lightning strike wire damage analysis method, and will not be repeated here.

[0167] Reference Figure 5 , Figure 5 This is a structural block diagram of the first embodiment of the lightning strike wire damage analysis device of the present invention.

[0168] like Figure 5 As shown, the lightning-struck wire damage analysis device provided in the embodiment of the present invention includes:

[0169] The information acquisition module 10 is used to obtain the tower coordinates of the fault tower in the line to be analyzed, the fault time, and the lightning activity information within a preset range where the tower coordinates are located;

[0170] A lightning strike analysis module 20, configured to obtain target lightning strike information from the lightning activity information according to the fault moment;

[0171] A finite element model building module 30, configured to build a finite element model based on the line information of the line to be analyzed and the target lightning strike information, wherein the finite element model includes the conductor, insulator string and tower cross arm of the faulty tower;

[0172] The conductor damage analysis module 40 is used to simulate the conductor damage process when the faulty pole tower is struck by lightning according to the finite element model, and perform conductor damage analysis on the faulty pole tower based on the simulation result.

[0173] In this embodiment, the tower coordinates of the fault tower in the line to be analyzed, the fault time, and the lightning activity information within a preset range where the tower coordinates are located are obtained, and the target lightning strike information is obtained from the lightning activity information according to the fault time. A finite element model is constructed based on the line information of the line to be analyzed and the target lightning strike information. The finite element model includes the conductor, insulator string, and tower cross arm of the faulty tower. The conductor damage process when the faulty tower is struck by lightning is simulated according to the finite element model, and the conductor damage analysis of the faulty tower is performed based on the simulation result. Since this embodiment locates the lightning strike activity, constructs a finite element model based on the target lightning strike information and line information, and effectively simulates the conductor damage during the lightning strike based on the finite element model, the accurate analysis of the line lightning strike damage is achieved without conducting on-site tests and measurements, ensuring the timeliness of the analysis, greatly improving the efficiency of the conductor damage analysis, and effectively reducing the analysis cost.

[0174] The lightning wire damage analysis device provided by the present application adopts the lightning wire damage analysis method in the above embodiment, which can solve the technical problem of lightning wire damage analysis. Compared with the prior art, the beneficial effects of the lightning wire damage analysis device provided by the present application are the same as the beneficial effects of the lightning wire damage analysis method provided by the above embodiment, and other technical features in the lightning wire damage analysis device are the same as the features disclosed in the above embodiment method, which will not be repeated here.

[0175] It should be understood that the above is only an example and does not constitute any limitation on the technical solution of the present invention. In specific applications, technicians in this field can make settings as needed, and the present invention does not limit this.

[0176] It should be noted that the workflow described above is merely illustrative and does not limit the scope of protection of the present invention. In practical applications, technicians in this field can select part or all of them according to actual needs to achieve the purpose of the present embodiment, and no limitation is made here.

[0177] In addition, for technical details not fully described in this embodiment, reference may be made to the lightning conductor damage analysis method provided in any embodiment of the present invention, and will not be repeated here.

[0178] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or system. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or system including the element.

[0179] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0180] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as a read-only memory / random access memory, a magnetic disk, or an optical disk), and includes a number of instructions for enabling a terminal device (which can be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to execute the methods described in each embodiment of the present invention.

[0181] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for analyzing damage to a wire caused by lightning, characterized in that: The lightning strike wire damage analysis method comprises: Obtaining the tower coordinates of the faulty tower in the line to be analyzed, the fault time, and the lightning activity information within a preset range where the tower coordinates are located; acquiring target lightning strike information from the lightning activity information according to the fault moment; Constructing a finite element model based on the line information of the line to be analyzed and the target lightning strike information, wherein the finite element model includes the conductor, the insulator string and the tower cross arm of the faulty tower; Simulating the wire damage process when the faulty tower is struck by lightning according to the finite element model, and performing wire damage analysis on the faulty tower based on the simulation result; The constructing of a finite element model based on the line information of the line to be analyzed and the target lightning strike information includes: Constructing a physical model of a lightning strike transient process based on the target lightning strike information and the line information of the line to be analyzed; Acquire insulation flashover information of the faulty tower according to the physical model of the lightning transient process; Constructing a finite element model based on the line information and the insulation flashover information; The line information includes: insulator string model, actual tower height, conductor hanging point height, conductor geometric center distance, ground hanging point height and ground wire geometric center distance; The constructing of a lightning transient process physical model based on the target lightning strike information and the line information of the line to be analyzed includes: Establishing a multi-wave impedance model based on the actual tower height; Construct an overhead line model according to the conductor hanging point height, the conductor geometric center distance, the ground hanging point height and the ground wire geometric center distance; Obtaining the insulator string volt-second characteristic parameter of the faulty tower based on the insulator string model; Acquiring flashover characterization information of the insulator string according to the volt-second characteristic parameter of the insulator string; A physical model of a lightning strike transient process is constructed based on the target lightning strike information, the multi-wave impedance model, the overhead line model and the insulator string flashover characterization information.

2. The lightning strike wire damage analysis method according to claim 1, characterized in that: The line information also includes: tower grounding resistance, lightning arrester height to ground and conductor height to ground; The constructing of a lightning transient process physical model based on the target lightning strike information, the multi-wave impedance model, the overhead line model and the insulator string flashover characterization information comprises: Acquiring lightning current waveform information based on the target lightning strike information; Determining an induced overvoltage coefficient according to the lightning current waveform information; Determine a simulated induced voltage based on the induced overvoltage coefficient, the height of the lightning conductor to the ground, and the height of the conductor to the ground; A physical model of a lightning transient process is constructed according to the tower grounding resistance, the simulated induced voltage, the multi-wave impedance model, the overhead line model and the insulator string flashover characterization information.

3. The method for analyzing damage to a wire caused by lightning as claimed in any one of claims 1 or 2, characterized in that: The simulating the wire damage process when the faulty tower is struck by lightning according to the finite element model, and performing wire damage analysis on the faulty tower based on the simulation result comprises: Perform arc wire contact simulation based on the finite element model to determine the arc wire contact point of the faulty tower; Simulating the temperature change of the arc wire contact point according to the physical model of the lightning transient process to obtain temperature change information; Obtaining material melting point information of the faulty tower; Determine a damaged area of ​​the conductor according to the temperature change information and the material melting point information; Conductor damage analysis is performed on the damaged area of ​​the conductor based on the temperature change information.

4. The lightning strike wire damage analysis method according to claim 3, characterized in that: The step of simulating the temperature change of the arc wire contact point according to the physical model of the lightning transient process to obtain the temperature change information includes: Obtain impulse current arc information and power frequency follow-current arc information based on the physical model of lightning transient process; Constructing an arc channel thermal model based on the impulse current arc information and the power frequency follow-current arc information; The temperature change of the arc wire contact point is simulated based on the arc channel thermal model to obtain temperature change information.

5. The lightning-struck wire damage analysis method according to claim 4, characterized in that: The simulating the temperature change of the arc wire contact point based on the arc channel thermal model to obtain temperature change information includes: Acquiring lightning impulse current information according to the physical model of the lightning transient process; Determine a voltage drop parameter per unit arc length based on the arc channel thermal model and the lightning impulse current information; Obtain the insulator string structure information of the faulty tower; Determining arc length based on the insulator string structure information; Determine the arc overall voltage drop parameter according to the arc length and the unit arc length voltage drop parameter; The temperature change of the arc wire contact point is simulated based on the arc overall voltage drop parameter to obtain temperature change information.

6. A lightning conductor damage analysis device, characterized in that: The lightning-strike wire damage analysis device comprises: An information acquisition module is used to obtain the tower coordinates of the faulty tower in the line to be analyzed, the fault time, and the lightning activity information within a preset range where the tower coordinates are located; A lightning strike analysis module, used for acquiring target lightning strike information from the lightning activity information according to the fault moment; A finite element model building module, used to build a finite element model based on the line information of the line to be analyzed and the target lightning strike information, wherein the finite element model includes the conductor, insulator string and tower cross arm of the fault tower; A conductor damage analysis module, used to simulate the conductor damage process when the faulty pole tower is struck by lightning according to the finite element model, and perform conductor damage analysis on the faulty pole tower based on the simulation results; The finite element model building module is further used to build a lightning transient process physical model based on the target lightning strike information and the line information of the line to be analyzed; obtain the insulation flashover information of the faulty tower according to the lightning transient process physical model; and build a finite element model based on the line information and the insulation flashover information; The line information includes: insulator string model, actual pole tower height, conductor hanging point height, conductor geometric center distance, ground hanging point height and ground wire geometric center distance; the finite element model construction module is also used to establish a multi-wave impedance model based on the actual pole tower height; construct an overhead line model according to the conductor hanging point height, the conductor geometric center distance, the ground hanging point height and the ground wire geometric center distance; obtain the insulator string volt-second characteristic parameters of the faulty pole tower based on the insulator string model; obtain the insulator string flashover characterization information based on the insulator string volt-second characteristic parameters; and construct a lightning strike transient process physical model based on the target lightning strike information, the multi-wave impedance model, the overhead line model and the insulator string flashover characterization information.

7. A lightning conductor damage analysis device, characterized in that: The lightning-strike wire damage analysis device comprises: a memory, a processor, and a lightning-strike wire damage analysis program stored in the memory and executable on the processor, wherein the lightning-strike wire damage analysis program is configured to implement the lightning-strike wire damage analysis method according to any one of claims 1 to 5.

8. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a lightning-struck wire damage analysis program, and when the lightning-struck wire damage analysis program is executed by a processor, the lightning-struck wire damage analysis method according to any one of claims 1 to 5 is implemented.

Images