Method, system and equipment for monitoring and analyzing abnormity of power transmission line

Abstract

The invention provides a power transmission line abnormity monitoring analysis method, system and device. The method comprises the following steps: constructing a data incidence matrix of all detection section distances and corresponding phase variations of a target optical cable; calculating the number of galloping half waves among towers of the target optical cable by using the data incidence matrix; calculating corresponding galloping amplitudes according to values of different galloping half-wave numbers; inputting the galloping half-wave numbers among the towers and the galloping amplitudes of the different galloping half-wave numbers into a power transmission line analysis model, outputting galloping amplitudes and target horizontal stress of the distances among the towers, and identifying a conductor galloping state according to the galloping amplitudes of the distances among the towers of the overhead line; judging whether the wire is abnormal or not according to comparison between the target horizontal stress of the overhead line tower distance and the maximum stress threshold value; and an ANSYS structural modal analysis simulation model is adopted as the power transmission line analysis model. Based on the method, the invention further provides a power transmission line abnormity monitoring and analyzing system and equipment. According to the invention, the galloping and disconnection monitoring and analysis of the overhead transmission line are realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of power transmission line monitoring and analysis, and in particular relates to a method, system and equipment for monitoring and analyzing abnormalities of power transmission lines. Background Art

[0002] When the overhead transmission lines are irregularly covered with ice, the overhead transmission lines are prone to dancing under the action of lateral wind force. The dancing phenomenon of overhead transmission lines may cause broken conductors, broken conductors, phase-to-phase flashover, and damage to hardware. In severe cases, the overhead transmission lines may collapse, affecting the safe operation of the transmission lines and the reliability of power supply.

[0003] There are many online monitoring technologies for power transmission line dancing in the prior art. The first one is the inertial sensor monitoring method. This method requires the installation of accelerometers on the conductors within multiple tower distances for important monitoring. However, the operating line may need to be powered off when installing the accelerometer, and the accelerometer measurement accuracy is insufficient. The second one is the video image dancing monitoring method. This method monitors the installation angle of the camera on the tower, but there are strict requirements for the installation height. At the same time, cameras need to be installed on multiple towers. The construction is cumbersome, and the analysis of video images is complex and the calculation cycle is long. The third one is the method of measuring the dancing of overhead transmission lines using OPGW ground wires. This method requires the installation of current transformers and oscilloscopes at a certain distance between OPGW ground wires. However, the number of instruments to be installed is large, and the operating line needs to be powered off for installation, which is troublesome for engineering construction. The oscilloscope installed on the tower also has power supply and communication instability problems.

[0004] Therefore, the online monitoring technologies for transmission line sway disclosed in the prior art all have the problem of troublesome operation and maintenance construction, and data transmission uses wireless communications such as 4G and 5G transmission to transmit to the corresponding management system, and the communication reliability is poor. The power supply is inductive power supply or solar power supply, and the power supply reliability is poor, which is not conducive to long-term online monitoring. Summary of the invention

[0005] In order to solve the above technical problems, the present invention proposes a method, system and device for monitoring and analyzing abnormalities of power transmission lines, which realizes real-time monitoring and analysis of the galloping and disconnection status of power transmission lines.

[0006] To achieve the above object, the present invention adopts the following technical solutions: A method for monitoring and analyzing abnormalities of a transmission line comprises the following steps: Determine the distance of each detection section of the target optical cable and the phase change amount corresponding to each detection section of the target optical cable, and construct a data association matrix of the distances of all detection sections of the target optical cable and the corresponding phase change amounts; The data association matrix is ​​used to calculate the dancing half-wave number between each tower of the target optical cable; and the dancing amplitude corresponding to different dancing half-wave numbers of the target optical cable is calculated according to the value of the dancing half-wave number; The dancing half-wave number between each tower of the target optical cable and the dancing amplitude of the target optical cable under different dancing half-wave numbers are input into the preset transmission line analysis model to output the dancing amplitude and target horizontal stress of each tower spacing. According to the dancing amplitude of the overhead line tower spacing, the dancing state of the conductor is identified; according to the comparison between the target horizontal stress of the overhead line tower spacing and the maximum stress threshold of the conductor during design, it is judged whether the conductor is abnormal; the transmission line analysis model adopts the ANSYS structural modal analysis simulation model.

[0007] A transmission line abnormality monitoring and analysis system, comprising: a preprocessing module, a calculation module and a monitoring and analysis module; The preprocessing module is used to determine the distance of each detection section of the target optical cable and the phase change amount corresponding to each detection section of the target optical cable, and to construct a data association matrix of the distances of all detection sections of the target optical cable and the corresponding phase change amounts; The calculation module is used to calculate the dancing half-wave number between each tower of the target optical cable using the data association matrix; and calculate the dancing amplitude corresponding to different dancing half-wave numbers of the target optical cable according to the value of the dancing half-wave number; The monitoring and analysis module is used to input the dancing half-wave number between each pole tower of the target optical cable and the dancing amplitude of the target optical cable under different dancing half-wave numbers into a preset transmission line analysis model to output the dancing amplitude and target horizontal stress of each pole tower spacing, identify the dancing state of the conductor according to the dancing amplitude of the overhead line pole tower spacing; judge whether the conductor is abnormal based on the comparison of the target horizontal stress of the overhead line pole tower spacing and the maximum stress threshold when the conductor is designed; the transmission line analysis model adopts the ANSYS structural modal analysis simulation model.

[0008] A transmission line abnormality monitoring and analysis device comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor can implement a transmission line abnormality monitoring and analysis method when executing the program.

[0009] The effects provided in the content of the invention are only the effects of the embodiments, not all the effects of the invention. One of the above technical solutions has the following advantages or beneficial effects: The present invention proposes a method, system and equipment for monitoring and analyzing abnormalities of power transmission lines, which belongs to the technical field of monitoring and analyzing the power transmission lines. The method includes the following steps: determining the distance of each detection section of the target optical cable and the phase change corresponding to each detection section of the target optical cable, and constructing a data association matrix of the distances of all detection sections of the target optical cable and the corresponding phase change; using the data association matrix to calculate the dancing half-wave number between each pole tower of the target optical cable; and calculating the corresponding dancing amplitude of the target optical cable under different dancing half-wave numbers according to the value of the dancing half-wave number; inputting the dancing half-wave number between each pole tower of the target optical cable and the dancing amplitude under different dancing half-wave numbers of the target optical cable into a preset power transmission line analysis model to output the dancing amplitude and target horizontal stress of each pole tower spacing, and identifying the dancing state of the conductor according to the dancing amplitude of the overhead line pole tower spacing; judging whether the conductor is abnormal according to the comparison of the target horizontal stress of the overhead line pole tower spacing with the maximum stress threshold when the conductor is designed; the transmission line analysis model adopts the ANSYS structural modal analysis simulation model. Based on a method for monitoring and analyzing abnormalities of power transmission lines, a system and equipment for monitoring and analyzing abnormalities of power transmission lines are also proposed. The present invention does not require the installation of sensors, but utilizes the existing spare optical fiber cores of the OPGW optical cable of the substation and adopts distributed optical sensing technology to realize the monitoring and analysis of the dancing and disconnection of the overhead transmission line. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 A flow chart of a method for monitoring and analyzing abnormalities of a power transmission line proposed in Example 1 of the present invention; Figure 2 A schematic diagram of a power transmission line abnormality monitoring and analysis system proposed in Embodiment 2 of the present invention; Figure 3 This is a schematic diagram of a power transmission line abnormality monitoring and analysis device proposed in Example 3 of the present invention. DETAILED DESCRIPTION

[0011] In order to clearly illustrate the technical features of the present solution, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings. The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. In addition, the present invention may repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. It should be noted that the components illustrated in the accompanying drawings are not necessarily drawn to scale. The present invention omits the description of known components and processing techniques and processes to avoid unnecessary limitations on the present invention.

[0012] Example 1 Embodiment 1 of the present invention proposes a method for monitoring and analyzing abnormalities of power transmission lines, which is used to solve the technical problems existing in the abnormal monitoring of power transmission lines in the prior art. Figure 1 A flow chart of a method for monitoring and analyzing abnormalities of a power transmission line proposed in Example 1 of the present invention; In step S100, the distance of each detection section of the target optical cable and the phase change amount corresponding to each detection section of the target optical cable are determined, and a data association matrix of the distances of all detection sections of the target optical cable and the corresponding phase change amounts is constructed; In this application, the distance and phase change data of each detection section of the spare optical fiber of the optical fiber overhead ground wire composite cable (OPGW cable) of the substation are monitored. The narrow pulse laser emits pulse light to the target optical cable; the photodetector receives the time difference between the backscattered Rayleigh light of each corresponding detection section; the signal processing unit synchronizes the sampling time of the pulse light and converts the optical signal into an electrical signal, which is then amplified and converted into digital-to-analog conversion to calculate the phase change corresponding to each detection section of the target optical cable.

[0013] The process of determining the distance of each detection segment of the target optical cable includes: The distances of all detection sections of the target optical cable are calculated by the time difference between emitting pulse light to the target optical cable and receiving the backscattered Rayleigh light of each set detection section of the target optical cable; Among them, the target optical cable The distance of each detection segment is expressed as: ; in is the light transmission speed of the optical fiber in the target optical cable; It is the time when the pulse light enters the target optical cable; The target optical cable The time it takes for the backscattered Rayleigh light corresponding to each detection segment to reach the detector; is the refractive index of the optical fiber.

[0014] The process of determining the phase change corresponding to each detection section of the target optical cable includes: ; in, The target optical cable Phase change of each detection segment; is the central wavelength of light; For optical cable The refractive index of the first detection segment; For optical cable The refractive index of the second detection segment; For optical cable The longitudinal strain of each detection segment; For optical cable The length of the detection segment.

[0015] The distance of each detection section of the target optical cable and the phase change amount corresponding to each detection section of the target optical cable together form a data association matrix.

[0016] In step S200, the dancing half-wave number between each tower of the target optical cable is calculated using the data association matrix; and the dancing amplitude corresponding to different dancing half-wave numbers of the target optical cable is calculated according to the value of the dancing half-wave number; According to the set spatial resolution, sampling frequency and sampling time of the OPGW optical cable detection distance segment, the phase difference signal data matrix of the OPGW optical cable is allocated according to the set tower spacing. A Hamming window is added to the data matrix corresponding to each tower spacing to eliminate the fence effect. Then the fast Fourier transform FFT is used to extract the frequency points and amplitudes corresponding to the power spectrum within a certain detection time. The frequency with the strongest amplitude is the natural vibration frequency f of the OPGW optical cable at this tower spacing. The number of other strong frequencies that are multiples of the natural vibration frequency is the modal number, that is, the dancing half-wave number N of the OPGW optical cable.

[0017] The OPGW optical cable will dance when irregular ice cover produces unbalanced lift. The change in horizontal tension caused by the dancing will cause the OPGW optical cable to change from one state to another. The calculation formula for the dancing amplitude is related to the dancing half-wave number.

[0018] When the target optical cable dancing half-wave number N is an even number, the relationship between the target optical cable horizontal tension change and the dancing amplitude is: ; in, is the horizontal tension corresponding to the first state condition of the target optical cable between towers (N); is the horizontal tension corresponding to the second state condition of the target optical cable between towers (N); is the Young's modulus of the target optical cable (Mpa); is the calculated cross-sectional area of ​​the target optical cable (mm2); Dance half wave number for target cable; is the natural vibration frequency of the target optical cable under the first state condition (Hz); is the natural vibration frequency of the target optical cable under the second state condition (Hz); is the mass per unit length of the target optical cable between towers under the first state condition (kg / m); is the mass per unit length of the target optical cable between towers under the second state condition (kg / m); is the dancing amplitude of the target optical cable at the dancing half-wave number N (m); is the sampling interval (s); is the target optical cable spacing between towers (m); is the total length of the target optical cable (m); The dancing amplitude of the target optical cable under the dancing half-wave number N is: .

[0019] When the target optical cable dancing half-wave number N is an odd number, the relationship between the target optical cable horizontal tension change and the dancing amplitude is: ; After sorting, we get: ; in, is the acceleration due to gravity, g=9.80665m / s2; is the target cable span height difference angle (rad); is the longitudinal strain of the target optical cable between towers; is the horizontal tension corresponding to the first state condition of the target optical cable between towers (N); is the horizontal tension corresponding to the second state condition of the target optical cable between towers (N); is the Young's modulus of the target optical cable; is the calculated cross-sectional area of ​​the target optical cable (mm2); Dance half wave number for target cable; is the natural vibration frequency of the target optical cable under the first state condition; is the natural vibration frequency of the target optical cable under the second state condition; is the mass per unit length of the target optical cable between towers under the first state condition (kg / m); is the mass per unit length of the target optical cable between towers under the second state condition (kg / m); is the dancing amplitude of the target optical cable under the dancing half-wave number N (m); is the sampling interval (s); is the target optical cable spacing between towers (m); is the total length of the target optical cable (m).

[0020] In step S300, the target optical cable dancing half-wave number between each tower and the dancing amplitude of the target optical cable at different dancing half-wave numbers are input into the preset transmission line analysis model to output the dancing amplitude and target horizontal stress of each tower spacing. The dancing state of the conductor is identified according to the dancing amplitude of the overhead line tower spacing. Whether the conductor is abnormal is determined by comparing the target horizontal stress of the overhead line tower spacing with the maximum stress threshold of the conductor during design. The transmission line analysis model adopts the ANSYS structural modal analysis simulation model.

[0021] The process of constructing the ANSYS structural modal analysis simulation model includes: according to the cross-sectional diameter of the conductor and OPGW optical cable of the transmission line, the materials of the conductor and OPGW optical cable, the number of conductor splits, the influence of the conductor anti-galloping method, the installation method of the conductor and OPGW optical cable, the height difference angle of the span between the conductor and the OPGW optical cable between the towers, the span between the towers, the tower type, the conductor sag and other parameters, using the ANSYS structural modal analysis simulation software to build a simulation model, adjust the influence coefficient of each parameter, and simulate the galloping state of the OPGW optical cable to the galloping state parameters of the transmission line and the maximum stress of the distributed monitoring of the conductor.

[0022] By comparing the target horizontal stress with the maximum stress threshold when the conductor is designed, the process of judging whether the conductor is abnormal includes: when the target horizontal stress reaches a preset proportion of the maximum stress threshold, issuing a conductor abnormality warning, wherein the conductor abnormality includes conductor strand breakage or wire breakage.

[0023] In the present application, when the target horizontal stress reaches 60% of the maximum stress threshold, an early warning signal is issued to prevent the occurrence of wire breakage or disconnection accidents, so as to achieve the monitoring and analysis of the transmission line galloping state and the wire breakage or disconnection state. The scope of protection of the present application is not limited to the specific ratios listed in Example 1, and those skilled in the art can adjust the ratio according to actual conditions.

[0024] A method for monitoring and analyzing abnormalities of a power transmission line proposed in Example 1 of the present invention does not require the installation of sensors, but utilizes the spare optical fiber cores of the existing OPGW optical cables in the substation and adopts distributed optical sensing technology to monitor and analyze the dancing and disconnection of overhead power transmission lines.

[0025] Example 2 Based on the power transmission line abnormality monitoring and analysis method proposed in Example 1 of the present invention, Example 2 of the present invention further proposes a power transmission line abnormality monitoring and analysis system. Figure 2 This is a schematic diagram of a power transmission line abnormality monitoring and analysis system proposed in Example 2 of the present invention; the system includes: a preprocessing module, a calculation module and a monitoring and analysis module; The preprocessing module is used to determine the distance of each detection section of the target optical cable and the phase change amount corresponding to each detection section of the target optical cable, and to construct a data association matrix of the distances of all detection sections of the target optical cable and the corresponding phase change amounts; The calculation module is used to calculate the dancing half-wave number between each tower of the target optical cable using the data association matrix; and calculate the dancing amplitude corresponding to different dancing half-wave numbers of the target optical cable according to the value of the dancing half-wave number; The monitoring and analysis module is used to input the target optical cable dancing half-wave number between each tower and the dancing amplitude of the target optical cable under different dancing half-wave numbers into the preset transmission line analysis model to output the dancing amplitude and target horizontal stress of each tower spacing, identify the conductor dancing state according to the dancing amplitude of the overhead line tower spacing; judge whether the conductor is abnormal based on the comparison of the target horizontal stress of the overhead line tower spacing and the maximum stress threshold when the conductor is designed; the transmission line analysis model adopts the ANSYS structural modal analysis simulation model.

[0026] During the execution of the preprocessing module, the process of determining the distance of each detection section of the target optical cable includes: The distances of all detection sections of the target optical cable are calculated by the time difference between emitting pulse light to the target optical cable and receiving the backscattered Rayleigh light of each set detection section of the target optical cable; Among them, the target optical cable The distance of each detection segment is expressed as: ; in is the light transmission speed of the optical fiber in the target optical cable; It is the time when the pulse light enters the target optical cable; The target optical cable The time it takes for the backscattered Rayleigh light corresponding to each detection segment to reach the detector; is the refractive index of the optical fiber.

[0027] The process of determining the phase change corresponding to each detection section of the target optical cable includes: ; in, The target optical cable Phase change of each detection segment; is the central wavelength of light; For optical cable The refractive index of the first detection segment; For optical cable The refractive index of the second detection segment; For optical cable The longitudinal strain of each detection segment; For optical cable The length of the detection segment.

[0028] A narrow pulse laser emits pulse light to the target optical cable; the photodetector receives the time difference between the backscattered Rayleigh light of each corresponding detection segment; the signal processing unit synchronizes the sampling time of the pulse light and converts the backscattered Rayleigh light signal into an electrical signal, which is then amplified and converted into a digital-to-analog conversion to obtain the refractive index and longitudinal strain corresponding to each detection segment of the target optical cable, and then calculate the phase change corresponding to each detection segment of the target optical cable.

[0029] During the execution of the calculation module, according to the set spatial resolution, sampling frequency and sampling time of the OPGW optical cable detection distance segment, the phase difference signal data matrix of the OPGW optical cable is allocated according to the set tower spacing. A Hamming window is added to each data matrix corresponding to the tower spacing to eliminate the fence effect. Then, the fast Fourier transform FFT is used to extract the frequency points and amplitudes corresponding to the power spectrum within a certain detection time. The frequency corresponding to the strongest amplitude is the natural vibration frequency f of the OPGW optical cable at this tower spacing. The number of other strong frequencies that are multiples of the natural vibration frequency is the modal number, that is, the dancing half-wave number N of the OPGW optical cable.

[0030] The OPGW optical cable will dance when irregular ice cover produces unbalanced lift. The change in horizontal tension caused by the dancing will cause the OPGW optical cable to change from one state to another. The calculation formula for the dancing amplitude is related to the dancing half-wave number.

[0031] When the target optical cable dancing half-wave number N is an even number, the relationship between the target optical cable horizontal tension change and the dancing amplitude is: ; in, is the horizontal tension corresponding to the first state condition of the target optical cable between towers (N); is the horizontal tension corresponding to the second state condition of the target optical cable between towers (N); is the Young's modulus of the target optical cable (Mpa); is the calculated cross-sectional area of ​​the target optical cable (mm2); Dance half wave number for target cable; is the natural vibration frequency of the target optical cable under the first state condition (Hz); is the natural vibration frequency of the target optical cable under the second state condition (Hz); is the mass per unit length of the target optical cable between towers under the first state condition (kg / m); is the mass per unit length of the target optical cable between towers under the second state condition (kg / m); is the dancing amplitude of the target optical cable at the dancing half-wave number N (m); is the sampling interval (s); is the target optical cable spacing between towers (m); is the total length of the target optical cable (m); The dancing amplitude of the target optical cable under the dancing half-wave number N is: .

[0032] When the target optical cable dancing half-wave number N is an odd number, the relationship between the target optical cable horizontal tension change and the dancing amplitude is: ; After sorting, we get: ; in, is the acceleration due to gravity, g=9.80665m / s2; is the target cable span height difference angle (rad); is the longitudinal strain of the target optical cable between towers; is the horizontal tension corresponding to the first state condition of the target optical cable between towers (N); is the horizontal tension corresponding to the second state condition of the target optical cable between towers (N); is the Young's modulus of the target optical cable; is the calculated cross-sectional area of ​​the target optical cable (mm2); Dance half wave number for target cable; is the natural vibration frequency of the target optical cable under the first state condition; is the natural vibration frequency of the target optical cable under the second state condition; is the mass per unit length of the target optical cable between towers under the first state condition (kg / m); is the mass per unit length of the target optical cable between towers under the second state condition (kg / m); is the dancing amplitude of the target optical cable under the dancing half-wave number N (m); is the sampling interval (s); is the target optical cable spacing between towers (m); is the total length of the target optical cable (m).

[0033] In the monitoring and analysis module, the process of constructing the ANSYS structural modal analysis simulation model includes: according to the cross-sectional diameter of the conductor and OPGW optical cable of the transmission line, the materials of the conductor and OPGW optical cable, the number of conductor splits, the influence of the conductor anti-galloping method, the installation method of the conductor and OPGW optical cable, the height difference angle of the span between the conductor and the OPGW optical cable between the towers, the span between the towers, the tower type, the conductor sag and other parameters, using the ANSYS structural modal analysis simulation software to build a simulation model, adjust the influence coefficient of each parameter, and simulate the galloping state of the OPGW optical cable to the galloping state parameters of the transmission line and the maximum stress of the distributed monitoring of the conductor.

[0034] Based on the comparison between the target horizontal stress of the overhead line tower spacing and the maximum stress threshold when the conductor is designed, the process of judging whether the conductor is abnormal includes: when the target horizontal stress reaches a preset proportion of the maximum stress threshold, a conductor abnormality warning is issued, wherein the conductor abnormality includes conductor strand breakage or wire breakage.

[0035] In this application, when the target horizontal stress reaches 60% of the maximum stress threshold, an early warning signal is issued to prevent the occurrence of wire breakage or disconnection accidents, so as to achieve the monitoring and analysis of the transmission line galloping state and the wire breakage or disconnection state. The scope of protection of this application is not limited to the specific ratios listed in Example 2, and those skilled in the art can adjust the ratio according to actual conditions.

[0036] A power transmission line abnormality monitoring and analysis system proposed in Example 2 of the present invention does not require the installation of sensors, but utilizes the existing spare optical fiber cores of the OPGW optical cable in the substation and adopts distributed optical sensing technology to realize the monitoring and analysis of the dancing and disconnection of overhead power transmission lines.

[0037] The description of the relevant parts of a transmission line abnormality monitoring and analysis system provided in Example 2 of the present application can be found in the detailed description of the corresponding parts of a transmission line abnormality monitoring and analysis method provided in Example 1 of the present application, and will not be repeated here.

[0038] Example 3 Based on the method for monitoring and analyzing abnormality of a power transmission line proposed in Example 1 of the present invention, Example 3 of the present invention further proposes a device for monitoring and analyzing abnormality of a power transmission line. Figure 3 A schematic diagram of a power transmission line abnormality monitoring and analysis device proposed in Embodiment 3 of the present invention includes: Memory for storing computer programs; The processor is used to implement the following method steps when executing the computer program: In step S100, the distance of each detection section of the target optical cable and the phase change amount corresponding to each detection section of the target optical cable are determined, and a data association matrix of the distances of all detection sections of the target optical cable and the corresponding phase change amounts is constructed; In step S200, the dancing half-wave number between each tower of the target optical cable is calculated using the data association matrix; and the dancing amplitude corresponding to different dancing half-wave numbers of the target optical cable is calculated according to the value of the dancing half-wave number; In step S300, the target optical cable dancing half-wave number between each tower and the dancing amplitude of the target optical cable at different dancing half-wave numbers are input into the preset transmission line analysis model to output the dancing amplitude and target horizontal stress of each tower spacing. The dancing state of the conductor is identified according to the dancing amplitude of the overhead line tower spacing. Whether the conductor is abnormal is determined by comparing the target horizontal stress of the overhead line tower spacing with the maximum stress threshold of the conductor during design. The transmission line analysis model adopts the ANSYS structural modal analysis simulation model.

[0039] A power transmission line abnormality monitoring and analysis device proposed in Example 3 of the present invention does not need to install sensors, but utilizes the existing OPGW optical cable spare optical fiber cores of the substation and adopts distributed optical sensing technology to realize the monitoring and analysis of overhead power transmission line dancing and disconnection.

[0040] The description of the relevant parts of a transmission line abnormality monitoring and analysis device provided in Example 3 of the present application can be found in the detailed description of the corresponding parts of a transmission line abnormality monitoring and analysis method provided in Example 1 of the present application, and will not be repeated here.

[0041] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the term "include", "comprise" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment that includes a series of elements are inherent to the elements. In the absence of more restrictions, the elements limited by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or equipment that includes the elements. In addition, the above-mentioned technical solution provided in the embodiment of the present application is consistent with the corresponding technical solution in the prior art in principle, and the part is not described in detail, so as not to repeat too much.

[0042] Although the above describes the specific implementation of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. For those skilled in the art, other different forms of modifications or deformations can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. On the basis of the technical solution of the present invention, various modifications or deformations that can be made by those skilled in the art without creative work are still within the scope of protection of the present invention.

Claims

1. A method for monitoring and analyzing abnormalities of a transmission line, characterized in that: The following steps are involved: Determine the distance of each detection section of the target optical cable and the phase change amount corresponding to each detection section of the target optical cable, and construct a data association matrix of the distances of all detection sections of the target optical cable and the corresponding phase change amounts; The data association matrix is ​​used to calculate the dancing half-wave number between each tower of the target optical cable; and the dancing amplitude corresponding to different dancing half-wave numbers of the target optical cable is calculated according to the value of the dancing half-wave number; The dancing half-wave number between each tower of the target optical cable and the dancing amplitude of the target optical cable under different dancing half-wave numbers are input into the preset power transmission line analysis model to output the dancing amplitude between each tower and the target horizontal stress, and the dancing state of the conductor is identified according to the dancing amplitude of the overhead line tower spacing; Whether the conductor is abnormal is determined by comparing the target horizontal stress of the overhead line tower spacing with the maximum stress threshold during conductor design. The transmission line analysis model adopts an ANSYS structural modal analysis simulation model.

2. A method for monitoring and analyzing abnormalities of a power transmission line according to claim 1, characterized in that: The process of determining the distance of each detection section of the target optical cable includes: The distances of all detection sections of the target optical cable are calculated by the time difference between emitting pulse light to the target optical cable and receiving the backscattered Rayleigh light of each set detection section of the target optical cable; Among them, the target optical cable The distance of each detection segment is expressed as: ； in is the light transmission speed of the optical fiber in the target optical cable; It is the time when the pulse light enters the target optical cable; The target optical cable The time it takes for the backscattered Rayleigh light corresponding to each detection segment to reach the detector; is the refractive index of the optical fiber.

3. A method for monitoring and analyzing abnormalities of a power transmission line according to claim 2, characterized in that: The process of determining the phase change corresponding to each detection section of the target optical cable includes: ； in, The target optical cable Phase change of each detection segment; is the central wavelength of light; For optical cable The refractive index of the first detection segment; For optical cable The refractive index of the second detection segment; For optical cable The longitudinal strain of each detection segment; For optical cable The length of the detection segment.

4. A method for monitoring and analyzing abnormalities of a power transmission line according to claim 3, characterized in that: In the method, a narrow pulse laser emits pulse light to a target optical cable; a photoelectric detector receives the time difference between the backscattered Rayleigh light of each corresponding detection segment; a signal processing unit synchronizes the sampling time of the pulse light and converts the backscattered Rayleigh light signal into an electrical signal, and then obtains the refractive index and longitudinal strain corresponding to each detection segment of the target optical cable through operational amplification and digital-to-analog conversion, and then calculates the phase change corresponding to each detection segment of the target optical cable.

5. A method for monitoring and analyzing abnormalities of a power transmission line according to claim 1, characterized in that: The process of calculating the dancing half-wave number between each tower of the target optical cable using the data association matrix includes: A Hamming window is added to the data correlation matrix corresponding to each tower spacing to eliminate the fence effect; Then, the fast Fourier transform is used to extract the frequency points and amplitudes corresponding to the power spectrum within the preset detection time, where the frequency corresponding to the strongest amplitude is the natural vibration frequency f of the target optical cable at the current tower spacing; The target cable dancing half-wave number N is the number of frequencies of the multiples of the natural vibration frequency f.

6. A method for monitoring and analyzing abnormalities of a power transmission line according to claim 5, characterized in that: The process of calculating the dancing amplitude corresponding to different dancing half-wave numbers of the target optical cable includes: when the dancing half-wave number N of the target optical cable is an even number, the relationship between the change in horizontal tension of the target optical cable and the dancing amplitude is: ； in, is the horizontal tension corresponding to the first state condition of the target optical cable between towers; is the horizontal tension corresponding to the second state condition of the target optical cable between towers; is the Young's modulus of the target optical cable; is the calculated cross-sectional area of ​​the target optical cable; Dance half wave number for target optical cable; is the natural vibration frequency of the target optical cable under the first state condition; is the natural vibration frequency of the target optical cable under the second state condition; is the mass per unit length of the target optical cable between towers under the first state condition; is the mass per unit length of the target optical cable between towers under the second state condition; is the dancing amplitude of the target optical cable under the dancing half-wave number N; is the sampling interval; The target optical cable spacing between certain towers; is the total length of the target optical cable; The dancing amplitude of the target optical cable under the dancing half-wave number N is: 。 7. A method for monitoring and analyzing abnormalities of a power transmission line according to claim 5, characterized in that: The process of calculating the dancing amplitude corresponding to different dancing half-wave numbers of the target optical cable also includes: when the dancing half-wave number N of the target optical cable is an odd number, the relationship between the change in horizontal tension of the target optical cable and the dancing amplitude is: ； After sorting, we get: ； in, is the acceleration due to gravity; is the height difference angle of the target optical cable span; is the longitudinal strain of the target optical cable between towers; is the horizontal tension corresponding to the first state condition of the target optical cable between towers; is the horizontal tension corresponding to the second state condition of the target optical cable between towers; is the Young's modulus of the target optical cable; is the calculated cross-sectional area of ​​the target optical cable; Dance half wave number for target optical cable; is the natural vibration frequency of the target optical cable under the first state condition; is the natural vibration frequency of the target optical cable under the second state condition; is the mass per unit length of the target optical cable between towers under the first state condition; is the mass per unit length of the target optical cable between towers under the second state condition; is the dancing amplitude of the target optical cable under the dancing half-wave number N; is the sampling interval; The target optical cable spacing between certain towers; is the total length of the target optical cable.

8. A method for monitoring and analyzing abnormalities of a power transmission line according to claim 1, characterized in that: Based on the comparison between the target horizontal stress of the overhead line tower spacing and the maximum stress threshold when the conductor is designed, the process of judging whether the conductor is abnormal includes: when the target horizontal stress reaches a preset proportion of the maximum stress threshold, a conductor abnormality warning is issued, wherein the conductor abnormality includes conductor strand breakage or wire breakage.

9. A transmission line abnormality monitoring and analysis system, characterized in that: include: Preprocessing module, calculation module and monitoring and analysis module; The preprocessing module is used to determine the distance of each detection section of the target optical cable and the phase change amount corresponding to each detection section of the target optical cable, and to construct a data association matrix of the distances of all detection sections of the target optical cable and the corresponding phase change amounts; The calculation module is used to calculate the dancing half-wave number between each tower of the target optical cable using the data association matrix; and calculate the dancing amplitude corresponding to different dancing half-wave numbers of the target optical cable according to the value of the dancing half-wave number; The monitoring and analysis module is used to input the dancing half-wave number between each pole tower of the target optical cable and the dancing amplitude of the target optical cable under different dancing half-wave numbers into a preset power transmission line analysis model to output the dancing amplitude and target horizontal stress of each pole tower spacing, and identify the conductor dancing state according to the dancing amplitude of the overhead line pole tower spacing; Whether the conductor is abnormal is determined by comparing the target horizontal stress of the overhead line tower spacing with the maximum stress threshold during conductor design. The transmission line analysis model adopts an ANSYS structural modal analysis simulation model.

10. A power transmission line abnormality monitoring and analysis system according to claim 9, characterized in that: In the preprocessing module, the process of determining the distance of each detection section of the target optical cable includes: The distances of all detection sections of the target optical cable are calculated by the time difference between emitting pulse light to the target optical cable and receiving the backscattered Rayleigh light of each set detection section of the target optical cable; Among them, the target optical cable The distance of each detection segment is expressed as: ； in, is the light transmission speed of the optical fiber in the target optical cable; It is the time when the pulse light enters the target optical cable; The target optical cable The time it takes for the backscattered Rayleigh light corresponding to each detection segment to reach the detector; is the refractive index of the optical fiber.

11. A power transmission line abnormality monitoring and analysis system according to claim 10, characterized in that: In the preprocessing module, the process of determining the phase change amount corresponding to each detection segment of the target optical cable includes: ； in, The target optical cable Phase change of each detection segment; is the central wavelength of light; For optical cable The refractive index of the first detection segment; For optical cable The refractive index of the second detection segment; For optical cable The longitudinal strain of each detection segment; For optical cable The length of the detection segment.

12. A power transmission line abnormality monitoring and analysis system according to claim 9, characterized in that: In the calculation module, the process of calculating the dancing half-wave number between each tower of the target optical cable by using the data association matrix includes: A Hamming window is added to the data correlation matrix corresponding to each tower spacing to eliminate the fence effect; Then, the fast Fourier transform is used to extract the frequency points and amplitudes corresponding to the power spectrum within the preset detection time, where the frequency corresponding to the strongest amplitude is the natural vibration frequency f of the target optical cable at the current tower spacing; The target cable dancing half-wave number N is the number of frequencies of the multiples of the natural vibration frequency f.

13. A power transmission line abnormality monitoring and analysis system according to claim 12, characterized in that: In the calculation module, when the target optical cable dancing half-wave number N is an even number, the relationship between the target optical cable horizontal tension change and the dancing amplitude is: ； in, is the horizontal tension corresponding to the first state condition of the target optical cable between towers; is the horizontal tension corresponding to the second state condition of the target optical cable between towers; is the Young's modulus of the target optical cable; is the calculated cross-sectional area of ​​the target optical cable; Dance half wave number for target optical cable; is the natural vibration frequency of the target optical cable under the first state condition; is the natural vibration frequency of the target optical cable under the second state condition; is the mass per unit length of the target optical cable between towers under the first state condition; is the mass per unit length of the target optical cable between towers under the second state condition; is the dancing amplitude of the target optical cable under the dancing half-wave number N; is the sampling interval; The target optical cable spacing between certain towers; is the total length of the target optical cable; The dancing amplitude of the target optical cable under the dancing half-wave number N is: 。 14. A power transmission line abnormality monitoring and analysis system according to claim 12, characterized in that: In the calculation module, when the target optical cable dancing half-wave number N is an odd number, the relationship between the target optical cable horizontal tension change and the dancing amplitude is: ； After sorting, we get: ； in, is the acceleration due to gravity; is the height difference angle of the target optical cable span; is the longitudinal strain of the target optical cable between towers; is the horizontal tension corresponding to the first state condition of the target optical cable between towers; is the horizontal tension corresponding to the second state condition of the target optical cable between towers; is the Young's modulus of the target optical cable; is the calculated cross-sectional area of ​​the target optical cable; Dance half wave number for target optical cable; is the natural vibration frequency of the target optical cable under the first state condition; is the natural vibration frequency of the target optical cable under the second state condition; is the mass per unit length of the target optical cable between towers under the first state condition; is the mass per unit length of the target optical cable between towers under the second state condition; is the dancing amplitude of the target optical cable under the dancing half-wave number N; is the sampling interval; The target optical cable spacing between certain towers; is the total length of the target optical cable.

15. A power transmission line abnormality monitoring and analysis system according to claim 9, characterized in that: In the monitoring and analysis module, the process of judging whether the conductor is abnormal based on the comparison between the target horizontal stress of the overhead line tower spacing and the maximum stress threshold when the conductor is designed includes: when the target horizontal stress reaches a preset ratio of the maximum stress threshold, issuing a conductor abnormality warning, wherein the conductor abnormality includes conductor strand breakage or wire breakage.

16. A transmission line abnormality monitoring and analysis device, characterized in that: The invention comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, a method for monitoring and analyzing abnormalities of a power transmission line as claimed in any one of claims 1 to 8 can be implemented.

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