Overhead ground wire and overhead phase wire galloping mode inversion method and terminal

Abstract

The application discloses an overhead ground wire and an overhead phase wire galloping mode inversion method and a terminal, wherein a vibration sensitive type optical time domain demodulator arranged in a transformer substation machine room is used to measure the vibration state of an optical fiber of the whole line of the overhead ground wire, the line is divided into various paragraphs according to a span, the galloping mode of the overhead ground wire in each span is derived based on sag estimation and a fiber / cable coupling mode, and the galloping mode of the overhead phase wire is derived by comparing the stress difference of the overhead phase wire and the overhead ground wire caused by different parameters such as the own type, Poisson's ratio and Young's modulus of the overhead phase wire and the overhead ground wire under the action of the same excitation source based on finite element simulation analysis. The application can collect the optical fiber vibration data in the overhead ground wire for a long time, and scientifically and objectively inverts the galloping mode of the overhead ground wire and the overhead phase wire in each span.

Description

Technical Field

[0001] This invention relates to the field of fiber optic sensing technology, and in particular to a method and terminal for inverting five modes of overhead ground wire and overhead phase wire galloping. Background Technology

[0002] Fiber optic composite overhead ground wire (OPGW) and fiber optic composite overhead phase wire (OPPC) have relatively high performance characteristics.

[0003] High reliability and stability have led to their widespread deployment and use in power grid systems. However, a significant portion of overhead transmission lines in power transmission systems are located in areas difficult for maintenance personnel to access, such as high-altitude and snow-covered regions.

[0004] Overhead power lines are more susceptible to extreme weather events such as strong winds and icing, which can cause them to gallop like standing waves, exerting significant impact on the towers and severely affecting the safe and stable operation of the power grid system. Therefore, monitoring the galloping patterns of overhead lines to determine their operating status and providing early warnings before accidents occur is of great importance to ensuring the safe and stable operation of transmission lines.

[0005] 5 However, compared to OPGW, OPPC has higher manufacturing costs and greater maintenance costs;

[0006] On the other hand, due to the different installation methods, OPPC has more stringent structural requirements and higher insulation requirements, thus its application scale is much smaller than that of OPGW. Generally speaking, OPGW is used for high-voltage lines above 110kV, while OPPC is suitable for lines with voltage levels below 110kV, such as suburban distribution networks and building systems.

[0007] Distribution automation stations, rural power grids, etc., so we usually conduct online monitoring of OPGW with a larger scale of use.

[0008] Compared to OPGW, which is used on a larger scale, overhead phase conductors generally lack alloy sheaths or stranded wires for protection, making them more susceptible to damage from external impacts. For these reasons, we typically pay more attention to the galloping and operating status of overhead phase conductors. Traditional monitoring of overhead phase conductors...

[0009] The current method primarily relies on online monitoring with electronic devices. It captures images of the cable galloping activity via video surveillance and transmits them through a computer network to a monitoring center for qualitative analysis. However, this approach lacks the ability to quantitatively measure the frequency and amplitude of cable galloping and suffers from poor electromagnetic interference resistance and high costs. Furthermore, existing technologies often struggle to directly monitor overhead phase lines, making it impossible to determine their galloping patterns and operational status. Therefore, obtaining the galloping pattern of the overhead phase line using distributed fiber optic sensing technology, and then using this pattern to inversely deduce the galloping pattern of the overhead phase line, is of significant importance. Summary of the Invention

[0010] The technical problem to be solved by the present invention is to provide a method and terminal for inverting the galloping mode of overhead ground wires and overhead phase wires, based on vibration-sensitive fiber optic sensing technology, and inverting the galloping mode of overhead phase wires by monitoring the vibration state of the optical fiber in the overhead ground wire.

[0011] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0012] A method for inverting the galloping mode of overhead ground wires and overhead phase wires includes the following steps:

[0013] S1. Use a vibration-sensitive optical time-domain demodulator to obtain the vibration state of the entire optical fiber of the overhead line;

[0014] S2. Divide the overhead line into multiple sections according to the span;

[0015] S3. Measure the dimensional parameters of the overhead ground wire and the optical fiber and determine the coupling relationship between the optical fiber and the outer shell of the overhead ground wire, and analyze the stress condition of the optical fiber.

[0016] S4. Based on sag estimation and fiber / cable coupling method, the galloping mode of the overhead ground wire in each span is derived.

[0017] S5. Based on finite element simulation analysis, obtain the correspondence between overhead ground wire and overhead phase wire;

[0018] S6. Measure the sag of the overhead ground wire and overhead phase wire of the same length line when there is no external excitation; based on the correspondence described in S5 and the difference in sag size when there is no external excitation, inversely deduce the galloping pattern of the overhead phase wire through the galloping pattern of the overhead ground wire.

[0019] To solve the above-mentioned technical problems, another technical solution adopted by the present invention is as follows:

[0020] A terminal for inverting the galloping mode of overhead ground wires and overhead phase wires includes a memory, a processor, and a computer program stored in the memory and executable on the processor. The processor executes the computer program to implement each step of the above-mentioned method for inverting the galloping mode of overhead ground wires and overhead phase wires.

[0021] The beneficial effects of this invention are as follows: By inverting the galloping mode of the overhead phase line through the galloping mode of the OPGW, the galloping position, frequency, and amplitude of the overhead phase line can be quantitatively monitored, enriching the means of monitoring the galloping of overhead phase lines. Vibration monitoring using the redundant optical fibers of the OPGW eliminates the need for additional fiber optic installation, reducing construction costs and lightening the load on transmission lines. Furthermore, based on sag estimation and fiber / cable coupling, the galloping mode of the OPGW can be monitored more accurately. Additionally, the use of finite element simulation analysis simplifies the structural models of the OPGW and the overhead phase line, improving the accuracy of the galloping mode inversion. Moreover, the monitoring host is located in the substation equipment room, reducing the failure rate and facilitating personnel maintenance and management. Attached Figure Description

[0022] Figure 1 This is a flowchart of a method for inverting the galloping mode of an overhead ground wire and an overhead phase wire according to an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the equipment connection of an overhead ground wire and overhead phase wire galloping mode inversion terminal according to an embodiment of the present invention;

[0024] Figure 3 This is a cross-sectional view of an OPGW optical cable for an overhead ground wire and overhead phase wire galloping mode inversion terminal according to an embodiment of the present invention.

[0025] Figure 4 This invention provides an OPGW and a finite element simulation model of an overhead phase wire, which are used in an inversion method for the galloping mode of overhead ground wires and overhead phase wires according to an embodiment of the present invention. Detailed Implementation

[0026] To explain in detail the technical content, objectives, and effects of the present invention, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0027] Definitions:

[0028] OPGW: Overhead ground wire, also known as fiber optic composite overhead ground wire, places optical fibers in the ground wire of overhead high-voltage transmission lines to form an optical fiber communication network on the transmission line, and has the dual functions of ground wire and communication.

[0029] OPPC: Overhead phase line, also known as fiber optic composite phase line cable, is a special type of power optical cable that has the dual functions of phase line and communication.

[0030] This invention provides a method for inverting the galloping mode of overhead ground wires and overhead phase wires, comprising the following steps:

[0031] S1. Use a vibration-sensitive optical time-domain demodulator to obtain the vibration state of the entire optical fiber of the overhead line;

[0032] S2. Divide the overhead line into multiple sections according to the span;

[0033] S3. Measure the dimensional parameters of the overhead ground wire and the optical fiber and determine the coupling relationship between the optical fiber and the outer shell of the overhead ground wire, and analyze the stress condition of the optical fiber.

[0034] S4. Based on sag estimation and fiber / cable coupling method, the galloping mode of the overhead ground wire in each span is derived.

[0035] S5. Based on finite element simulation analysis, obtain the correspondence between overhead ground wire and overhead phase wire;

[0036] S6. Measure the sag of the overhead ground wire and overhead phase wire of the same length line when there is no external excitation; based on the correspondence described in S5 and the difference in sag size when there is no external excitation, inversely deduce the galloping pattern of the overhead phase wire through the galloping pattern of the overhead ground wire.

[0037] As described above, the beneficial effects of this invention are as follows: By inverting the galloping mode of the overhead phase line through the galloping mode of the OPGW, the galloping position, frequency, amplitude, and other parameters of the overhead phase line can be quantitatively monitored, enriching the means of monitoring the galloping of overhead phase lines. Vibration monitoring using the redundant optical fibers of the OPGW eliminates the need for additional fiber optic installation, reducing construction costs and lightening the load on transmission lines. Furthermore, based on sag estimation and fiber / cable coupling, the galloping mode of the OPGW can be monitored more accurately. Moreover, the use of finite element simulation analysis simplifies the structural models of the OPGW and the overhead phase line, improving the accuracy of the galloping mode inversion. In addition, the monitoring host is located in the substation equipment room, reducing the failure rate and facilitating personnel maintenance and management.

[0038] Furthermore, the span mentioned in step S2 is the horizontal distance between two suspension points of the overhead line in a plane parallel to the specific load on the conductor between two adjacent towers, used to distinguish the galloping state of the overhead ground wire in different spans.

[0039] As can be seen from the above description, this is to facilitate the subsequent derivation of the galloping pattern of the overhead ground wire within each span.

[0040] Furthermore, step S4 specifically includes:

[0041] Estimate the sag of the overhead line within each span, assess the line's state without excitation, and based on the force analysis in step S3, obtain the relationship between the magnitude of the radial and axial shear forces on the optical fiber cable caused by external excitation and the magnitude of the corresponding shear forces on the optical fiber cable.

[0042] Based on the vibration state of all optical fibers in the overhead line, the stress on the overhead ground wire due to external excitation is calculated. Under the condition of no excitation and with the existing sag estimate, the strain of the overhead ground wire is calculated, and the galloping mode of the overhead ground wire is deduced.

[0043] As described above, evaluating the sag of the line and analyzing the coupling mode of the optical fiber cable under unexcited conditions eliminates interference from external factors and is more accurate than the OPGW galloping mode obtained by traditional monitoring methods.

[0044] Furthermore, step S5 specifically includes:

[0045] The overhead ground wire and overhead phase wire are simplified into a two-layer model of aluminum wire and filler;

[0046] Based on the different radial and axial shear forces experienced by the overhead ground wire and overhead phase wire under the same excitation source due to their different system, damping ratio, and Young's modulus parameters, the strain magnitude of the internal structural units of the overhead ground wire and overhead phase wire and the different displacement magnitudes generated under external force are compared to establish the correspondence between the overhead ground wire and overhead phase wire.

[0047] As described above, the finite element simulation analysis method simplifies the structural models of the OPGW and the overhead phase line. Under the same excitation source, the strain and vibration of the overhead phase line can be accurately analyzed based on the different stress conditions caused by the difference in parameters between the two, thus improving the accuracy of the overhead phase line galloping mode inversion.

[0048] Furthermore, the estimation of the sag of the overhead line within each span specifically involves:

[0049] When an overhead ground wire is in a state without external excitation, the sag of the conductor is estimated based on the conductor's tension, inclination angle, and temperature parameters.

[0050] As described above, the measurement shows the different sag sizes of the OPGW and overhead phase conductors of equal length lines due to their own weight when there is no external excitation. Based on the above correspondence and the difference in sag size without excitation, the galloping mode of the overhead phase conductors can be inferred from the galloping mode of the OPGW.

[0051] A terminal for inverting the galloping mode of overhead ground wires and overhead phase wires includes a memory, a processor, and a computer program stored in the memory and executable on the processor. The processor, when executing the computer program, performs the following steps:

[0052] S1. Use a vibration-sensitive optical time-domain demodulator to obtain the vibration state of the entire optical fiber of the overhead line;

[0053] S2. Divide the overhead line into multiple sections according to the span;

[0054] S3. Measure the dimensional parameters of the overhead ground wire and the optical fiber and determine the coupling relationship between the optical fiber and the outer shell of the overhead ground wire, and analyze the stress condition of the optical fiber.

[0055] S4. Based on sag estimation and fiber / cable coupling method, the galloping mode of the overhead ground wire in each span is derived.

[0056] S5. Based on finite element simulation analysis, obtain the correspondence between overhead ground wire and overhead phase wire;

[0057] S6. Measure the sag of the overhead ground wire and overhead phase wire of the same length line when there is no external excitation; based on the correspondence described in S5 and the difference in sag size when there is no external excitation, inversely deduce the galloping pattern of the overhead phase wire through the galloping pattern of the overhead ground wire.

[0058] As described above, the beneficial effects of this invention are as follows: By inverting the galloping mode of the overhead phase line through the galloping mode of the OPGW, the galloping position, frequency, amplitude, and other parameters of the overhead phase line can be quantitatively monitored, enriching the means of monitoring the galloping of overhead phase lines. Vibration monitoring using the redundant optical fibers of the OPGW eliminates the need for additional fiber optic installation, reducing construction costs and lightening the load on transmission lines. Furthermore, based on sag estimation and fiber / cable coupling, the galloping mode of the OPGW can be monitored more accurately. Moreover, the use of finite element simulation analysis simplifies the structural models of the OPGW and the overhead phase line, improving the accuracy of the galloping mode inversion. In addition, the monitoring host is located in the substation equipment room, reducing the failure rate and facilitating personnel maintenance and management.

[0059] Furthermore, the span mentioned in step S2 is the horizontal distance between two suspension points of the overhead line in a plane parallel to the specific load on the conductor between two adjacent towers, used to distinguish the galloping state of the overhead ground wire in different spans.

[0060] As can be seen from the above description, this is to facilitate the subsequent derivation of the galloping pattern of the overhead ground wire within each span.

[0061] Furthermore, step S4 specifically includes:

[0062] Estimate the sag of the overhead line within each span, assess the line's state without excitation, and based on the force analysis in step S3, obtain the relationship between the magnitude of the radial and axial shear forces on the optical fiber cable caused by external excitation and the magnitude of the corresponding shear forces on the optical fiber cable.

[0063] Based on the vibration state of all optical fibers in the overhead line, the stress on the overhead ground wire due to external excitation is calculated. Under the condition of no excitation and with the existing sag estimate, the strain of the overhead ground wire is calculated, and the galloping mode of the overhead ground wire is deduced.

[0064] As described above, evaluating the sag of the line and analyzing the coupling mode of the optical fiber cable under unexcited conditions eliminates interference from external factors and is more accurate than the OPGW galloping mode obtained by traditional monitoring methods.

[0065] Furthermore, step S5 specifically includes:

[0066] The overhead ground wire and overhead phase wire are simplified into a two-layer model of aluminum wire and filler;

[0067] Based on the different radial and axial shear forces experienced by the overhead ground wire and overhead phase wire under the same excitation source due to their different system, damping ratio, and Young's modulus parameters, the strain magnitude of the internal structural units of the overhead ground wire and overhead phase wire and the different displacement magnitudes generated under external force are compared to establish the correspondence between the overhead ground wire and overhead phase wire.

[0068] As described above, the finite element simulation analysis method simplifies the structural models of the OPGW and the overhead phase line. Under the same excitation source, the strain and vibration of the overhead phase line can be accurately analyzed based on the different stress conditions caused by the difference in parameters between the two, thus improving the accuracy of the overhead phase line galloping mode inversion.

[0069] Furthermore, the estimation of the sag of the overhead line within each span specifically involves:

[0070] When an overhead ground wire is in a state without external excitation, the sag of the conductor is estimated based on the conductor's tension, inclination angle, and temperature parameters.

[0071] As described above, the measurement shows the different sag sizes of the OPGW and overhead phase conductors of equal length lines due to their own weight when there is no external excitation. Based on the above correspondence and the difference in sag size without excitation, the galloping mode of the overhead phase conductors can be inferred from the galloping mode of the OPGW.

[0072] The present invention provides a method and terminal for inverting the galloping mode of overhead ground wires and overhead phase wires, which can invert the galloping mode of overhead phase wires, monitor the operating status of overhead lines in real time, and provide timely warnings before accidents occur. The following is a detailed description of the specific implementation method:

[0073] Example 1

[0074] A method for inverting the galloping mode of overhead ground wires and overhead phase wires includes the following steps:

[0075] S1. Use a vibration-sensitive optical time-domain demodulator to obtain the vibration state of the entire optical fiber of the overhead line;

[0076] S2. Divide the overhead line into multiple sections according to the span;

[0077] Among them, the span is the horizontal distance between two suspension points of an overhead line in a plane parallel to the specific load on the conductor between two adjacent towers, and is used to distinguish the galloping state of the overhead ground wire in different spans.

[0078] Please refer to Figure 2 Taking the monitoring of the galloping state of a 1-kilometer overhead line as an example, the entire line is divided into 5 sections based on a 200-meter span, to distinguish the galloping state of the OPGW within different spans. A vibration-sensitive optical time-domain demodulator is typically deployed in the substation equipment room to receive the backscattered Rayleigh (RBS) light generated during the transmission of the probe pulse light and plot the RBS curve. The amplitude of the RBS signal within a single span is demodulated to obtain the location of the fiber disturbance; the phase of the RBS signal within a single span is demodulated to obtain the fiber strain information. Both are combined to determine the vibration state of the fiber.

[0079] S3. Measure the dimensional parameters of the overhead ground wire and the optical fiber and determine the coupling relationship between the optical fiber and the outer shell of the overhead ground wire, and analyze the stress condition of the optical fiber.

[0080] Specifically, the diameter of the overhead ground wire cable is measured, the cross-sectional width of the aluminum alloy wire, aluminum-clad steel wire and stainless steel pipe in the overhead ground wire structure is measured, the thickness of the grease filling the gap between the optical fiber and the sheath is measured, the coupling relationship between the optical fiber and the overhead ground wire shell is determined, and the stress on the optical fiber is analyzed.

[0081] Please refer to Figure 3The optical fiber is inserted into a stainless steel sleeve, the gaps are filled with fiber grease, aluminum-clad steel wire is wrapped around the sleeve, and an outermost layer of aluminum alloy wire is wrapped around it, and then the layers are twisted into a cable. The measured diameter of the optical cable is 30mm, the cross-sectional width of the aluminum alloy wire is 4mm, the cross-sectional width of the aluminum-clad steel wire is 5mm, the diameter of the stainless steel tube is 12mm, and the thickness of the grease is 10mm. Based on the above fiber / cable coupling method, the force relationship between the optical fiber and the OPGW shell is analyzed to obtain the corresponding relationship between the radial and axial shear forces of the optical fiber and the cable caused by external excitation. Considering that all towers cannot be at the same altitude and the initial state of the line in each span is different, the sag of the OPGW line in each span is estimated based on parameters such as conductor tension, tilt angle, and temperature under the condition that there is no external excitation of the line. Then, based on the fiber / cable coupling method and the sag estimation in a single span, the OPGW's dancing mode is inferred from the vibration state of the optical fiber itself.

[0082] S4. Based on sag estimation and fiber / cable coupling, the galloping mode of the overhead ground wire within each span is derived, specifically:

[0083] Estimate the sag of the overhead line within each span, assess the line's state without excitation, and based on the force analysis in step S3, obtain the relationship between the magnitude of the radial and axial shear forces on the optical fiber cable caused by external excitation and the magnitude of the corresponding shear forces on the optical fiber cable.

[0084] By combining the vibration state of the optical fibers of the entire overhead line, the stress on the overhead ground wire due to external excitation is calculated. Based on the existing sag estimation under no-excitation conditions, the strain of the overhead ground wire is calculated, and the galloping mode of the overhead ground wire is deduced.

[0085] S5. Based on finite element simulation analysis, obtain the correspondence between overhead ground wires and overhead phase wires, specifically:

[0086] The overhead ground wire and overhead phase wire are simplified into a two-layer model of aluminum wire and filler;

[0087] Based on the different radial and axial shear forces experienced by the overhead ground wire and overhead phase wire under the same excitation source due to their different system, damping ratio, and Young's modulus parameters, the strain magnitude of the internal structural units of the overhead ground wire and overhead phase wire and the different displacement magnitudes generated under external force are compared to establish the correspondence between the overhead ground wire and overhead phase wire.

[0088] The estimation of sag for overhead lines within each span is specifically as follows:

[0089] When an overhead ground wire is in a state without external excitation, the sag of the conductor is estimated based on the conductor's tension, inclination angle, and temperature parameters.

[0090] Please refer to Figure 4 The OPGW and overhead phase conductors are simplified into a two-layer structure model consisting of aluminum wire and filler. Due to the differences in their specifications, overhead phase conductors generally do not have an alloy sheath or stranded wire for protection; therefore, the cable diameter, damping ratio, and Young's modulus of overhead phase conductors are generally smaller than those of OPGW. Based on the parameters of common OPGW and overhead phase conductors, the OPGW in the simulation model has a diameter of 30mm and a density of 3483kg / m³. 3 Young's modulus is set to 1.62 × 10⁻⁶. 11 Pa, Poisson's ratio is set to 0.32; the diameter of the overhead phase conductor is set to 24 mm, and the density is set to 3246 kg / m³. 3 Young's modulus is set to 6.75 × 10⁻⁶. 10 Pa, Poisson's ratio set to 0.29; the diameter of the filling portion of both is set to 6 mm, and the density is set to 2460 kg / m³. 3 Young's modulus is set to 6.8 × 10⁻⁶. 9 Pa, with Poisson's ratio set to 0.16. With cable lengths of 200 meters, simulated wind sources with a downward 30° velocity of 10 m / s were applied at the same height on the same side of the cable. The radial and axial shear forces experienced under the same excitation source were compared due to differences in cable diameter, Poisson's ratio, and Young's modulus, resulting in different strains in the internal structural units of the cable and different displacements under external forces. The correlation between the two was then established. The different sag sizes caused by the self-weight of the OPGW and overhead phase conductors of equal-length lines were measured without external excitation. Based on the above correlation and the difference in sag size without excitation, the galloping mode of the overhead phase conductors was inverted from the galloping mode of the OPGW.

[0091] S6. Measure the sag of the overhead ground wire and overhead phase wire of the same length line when there is no external excitation; based on the correspondence of S5 and the difference in sag size when there is no external excitation, inversely deduce the galloping pattern of the overhead phase wire through the galloping pattern of the overhead ground wire.

[0092] Example 2

[0093] Please refer to Figure 2 This embodiment provides an overhead ground wire and overhead phase wire galloping mode inversion terminal, including a memory, a processor, and a computer program stored in the memory and executable on the processor. The characteristic of this embodiment is that when the processor executes the computer program, it implements the various steps in Embodiment 1.

[0094] Specifically, a vibration-sensitive optical time-domain demodulator is installed in the substation equipment room to measure the vibration state of the entire optical fiber of the fiber-optic composite overhead ground wire.

[0095] The vibration-sensitive optical time-domain demodulator is connected to the redundant optical fibers in the overhead ground wire to process and analyze the backscattered phase of the incident light and obtain the vibration state of the entire optical fiber in the overhead ground wire.

[0096] The optical fiber is inserted into a stainless steel sleeve surrounded by aluminum-clad steel wire. The gap between the optical fiber and the sleeve is filled with grease. The outer shell of the sleeve is wrapped with aluminum alloy wire. Based on this structure, the stress analysis of the optical fiber is carried out.

[0097] In summary, the present invention provides a method and terminal for inverting the galloping mode of overhead ground wires and overhead phase wires. By deriving the galloping mode of the OPGW within each span based on sag estimation and fiber / cable coupling, and inverting the galloping mode of the overhead phase wire based on finite element simulation analysis and the galloping mode of the OPGW, the invention can monitor the operating status of overhead lines in real time and provide timely warnings before accidents occur.

[0098] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that the present invention is not limited to the described order of actions, because according to the present invention, some steps can be performed in other orders or simultaneously. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to the present invention.

[0099] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0100] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A method for galloping mode inversion of overhead ground and phase conductors, characterized by, The method comprises the following steps: S1, using a vibration-sensitive optical time domain demodulator to obtain the vibration state of the optical fiber of the overhead line; S2, dividing the overhead line into multiple sections according to the span; S3, measuring the size parameters of the overhead ground wire and the optical fiber and determining the coupling relationship between the optical fiber and the shell of the overhead ground wire, and analyzing the stress condition of the optical fiber; S4, deducing the galloping mode of the overhead ground wire in each span based on the sag estimation and the optical fiber / cable coupling mode; S5, obtaining the corresponding relationship between the overhead ground wire and the overhead phase wire based on finite element simulation analysis; S6, measuring the sag size of the overhead ground wire and the overhead phase wire of the equal-length line under no external excitation; based on the corresponding relationship in S5 and the different sag sizes under no external excitation, the galloping mode of the overhead phase wire is inversely deduced from the galloping mode of the overhead ground wire; Step S4 specifically comprises: Estimating the sag of the overhead line in each span, evaluating the state of the line under no excitation, obtaining the relationship between the radial and axial shear force of the optical fiber / cable caused by external excitation and the corresponding shear force of the optical fiber / cable based on the stress condition analysis in step S3; Combining the vibration state of the optical fiber of the overhead line, calculating the stress size of the overhead ground wire caused by external excitation, calculating the strain size of the overhead ground wire based on the existing sag estimation under no excitation condition, and inversely deducing the galloping mode of the overhead ground wire; Step S5 specifically comprises: Simplifying the overhead ground wire and the overhead phase wire into a two-layer model of aluminum wire and filler; Comparing the strain size of the internal structure unit of the overhead ground wire and the overhead phase wire and the different displacement size generated under external force, establishing the corresponding relationship between the overhead ground wire and the overhead phase wire, according to the different radial and axial shear force sizes of the overhead ground wire and the overhead phase wire caused by their own specifications, damping ratios and Young's modulus parameters under the action of the same excitation source; The estimation of the sag of the overhead line in each span specifically comprises: Under the condition of no external excitation of the overhead ground wire, the sag size of the conductor is evaluated based on the sag estimation according to the tension, inclination and temperature parameters of the conductor.

2. The method of claim 1, wherein, The span in step S2 is the horizontal distance between the two suspension points of the overhead line in the plane parallel to the specific load of the conductor between the adjacent two towers, which is used to distinguish the galloping state of the overhead ground wire in different spans.

3. An overhead ground and phase conductor galloping mode inversion terminal, characterized in that, The computer program product comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, characterized in that the processor implements the following steps when executing the computer program: S1, using a vibration-sensitive optical time domain demodulator to obtain the vibration state of the optical fiber of the overhead line; S2, dividing the overhead line into multiple sections according to the span; S3, measuring the size parameters of the overhead ground wire and the optical fiber and determining the coupling relationship between the optical fiber and the shell of the overhead ground wire, and analyzing the stress condition of the optical fiber; S4, deducing the galloping mode of the overhead ground wire in each span based on the sag estimation and the optical fiber / cable coupling mode; S5, obtaining the corresponding relationship between the overhead ground wire and the overhead phase wire based on finite element simulation analysis; S6, measuring the sag size of the overhead ground wire and the overhead phase wire of the equal-length line under no external excitation; based on the corresponding relationship in S5 and the different sag sizes under no external excitation, the galloping mode of the overhead phase wire is inversely deduced from the galloping mode of the overhead ground wire. S6, measuring the sag of the overhead ground wire and the overhead phase wire of the equal-length line under no external excitation; based on the corresponding relationship in S5 and the different sag under no external excitation, the galloping mode of the overhead phase wire is inversed from the galloping mode of the overhead ground wire; Step S4 is specifically: The sag of the overhead line in each span is estimated, the state of the line under no excitation is evaluated, and the relationship between the radial and axial shear force of the optical cable due to external excitation and the corresponding shear force of the optical cable is obtained according to the stress analysis in step S3; Combined with the vibration state of the optical fiber of the overhead line, the stress of the overhead ground wire due to external excitation is calculated, the strain of the overhead ground wire is calculated based on the sag estimation under no excitation, and the galloping mode of the overhead ground wire is inversed; Step S5 is specifically: The overhead ground wire and the overhead phase wire are simplified as a two-layer model of aluminum wire and filler; According to the different radial and axial shear forces of the overhead ground wire and the overhead phase wire due to different parameters such as their own specifications, damping ratios and Young's moduli under the action of the same excitation source, the strain size of the internal structure unit of the overhead ground wire and the overhead phase wire and the different displacement size generated under the action of external force are compared, and the corresponding relationship of the overhead ground wire and the overhead phase wire is established. The estimation of the sag of the overhead line in each span is specifically: Under the condition that the overhead ground wire is under no external excitation, the sag of the conductor is evaluated based on the sag estimation according to the tension, inclination and temperature parameters of the conductor.

4. An overhead ground and phase conductor galloping mode inversion terminal according to claim 3, characterized in that, The span in step S2 is the horizontal distance between the two suspension points of the overhead line in the plane parallel to the specific load of the conductor between the adjacent two tower poles, which is used to distinguish the galloping state of the overhead ground wire in different spans.

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