CN111609807B - Power transmission line dynamic deformation reconstruction method based on OPGW (optical fiber composite overhead ground wire) multi-core stress sensing - Google Patents
Power transmission line dynamic deformation reconstruction method based on OPGW (optical fiber composite overhead ground wire) multi-core stress sensing Download PDFInfo
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- CN111609807B CN111609807B CN202010572688.6A CN202010572688A CN111609807B CN 111609807 B CN111609807 B CN 111609807B CN 202010572688 A CN202010572688 A CN 202010572688A CN 111609807 B CN111609807 B CN 111609807B
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Abstract
The invention discloses a power transmission line dynamic deformation reconstruction method based on OPGW (optical fiber composite overhead ground wire) multi-core stress sensing, which comprises the steps of selecting a plurality of optical fibers in an OPGW optical cable in a static state as selected optical fibers, using a distributed optical fiber stress sensing system to measure the stress of each selected optical fiber in a natural suspension state respectively, calculating the coupling coefficient of each selected optical fiber to the same external disturbance according to the stress in the natural suspension state of each selected optical fiber, determining the correction stress of each selected optical fiber according to the measurement result of the stress dynamic distribution condition of each selected optical fiber and the coupling coefficient of the corresponding selected optical fiber respectively, and constructing the three-dimensional shape of the OPGW optical cable according to a shape reduction formula and the correction stress of each selected optical fiber so as to reconstruct the corresponding power transmission line dynamic deformation and improve the accuracy of the power transmission line dynamic deformation obtained by reconstruction.
Description
Technical Field
The invention relates to the technical field of optical fiber sensing, in particular to a power transmission line dynamic deformation reconstruction method based on OPGW multi-core stress sensing.
Background
In the development of smart grids, the convergence of power transmission and communication networks is called as a main trend, wherein optical fiber communication is called as an important component, so that power optical cables are widely applied to power systems. The optical fiber composite overhead ground wire (OPGW) optical cable is an electric power optical cable mainly adopted in the construction of an intelligent power grid due to the characteristics of easiness in maintenance, reliability in operation, relatively mature technology and the like. Because the optical cable is usually laid along with the high-voltage overhead transmission line, the optical cable runs in the field for a long time and is influenced by various external environments, such as ice coating, gust and the like, so that the mechanical performance and the electrical performance of the optical cable are influenced. In order to eliminate the potential safety hazard of the OPGW optical cable as early as possible and ensure the safe and reliable operation of a communication line, a large number of on-line monitoring technologies based on the optical fiber sensing principle are applied.
In the field of OPGW optical cable stress monitoring, measurement is usually carried out based on the Brillouin frequency shift principle at present. In 2015, the national grid electric power science research institute fangcong and the like perform strain experimental research on OPGW by using a Brillouin optical time domain reflectometer (B-OTDR), and perform a tensile test simulation experiment. The patent "OPGW optical cable stress testing method" of Zhao group et al in 2014 realizes stress monitoring of OPGW by utilizing Brillouin spectrum. However, although these methods can achieve fault location by using the stress result of a single optical fiber, the amplitude of the external acting force cannot be accurately restored, and the swing direction of the OPGW optical cable cannot be monitored. Optical fiber shape sensing, as a new technology in recent years, has a great deal of applications in the fields of medical treatment, aerospace, intelligent wearing and the like. Because the basis of optical fiber shape sensing is to acquire optical fiber strain distribution, the optical fiber shape sensing technology is gradually introduced in the cable monitoring process, and the potential application prospect exists. In 2019, the switzerland federal institute of technology and engineering adopted phi-OTDR to realize the reconstruction of the multi-core optical fiber shape sensor. In 2016, the Tangming project group of Huazhong university of science and technology implemented fiber curvature solutions using B-OTDR. The use of B-OTDR for fiber shape sensing has subsequently been developed further. However, multi-core optical fibers are often used for optical fiber shape sensing, and although the OPGW optical cable includes a plurality of optical fibers, the structure is largely different from that of the multi-core optical fibers. The multicore fiber is formed by reasonably arranging a plurality of fiber cores in one optical fiber, the fiber cores are separated by cladding, the fiber cores are very small in space and compact in structure. In the OPGW optical cable, a plurality of independent optical fibers are arranged in the optical fiber unit, and a necessary mechanical protection structure is designed to prevent the optical fiber core from being extruded, for example, some metal structures are used for protection, and the optical fiber core in the internal optical fiber unit has different arrangement tightness degrees, and mainly has a buffer tight-sleeve structure and a loose-sleeve structure. The degree of tightness of these protective structures and the arrangement of the optical fibers is such that when the entire cable is subjected to an external force, the response of the optical fibers at different positions to the force will differ. The characteristics of the OPGW optical cable structure cause that the OPGW optical cable structure is different from a multi-core optical fiber used in a sensing process, so that the accuracy of the determined dynamic deformation of the power transmission line is low.
Disclosure of Invention
Aiming at the problems, the invention provides a power transmission line dynamic deformation reconstruction method based on OPGW multi-core stress sensing.
In order to achieve the purpose of the invention, the invention provides a power transmission line dynamic deformation reconstruction method based on OPGW multi-core stress sensing, which comprises the following steps:
s10, selecting a plurality of optical fibers in the OPGW optical cable as selected optical fibers in a static state, and respectively measuring the stress of each selected optical fiber in a natural suspension state by using a distributed optical fiber stress sensing system;
s20, respectively calculating the coupling coefficient of each selected optical fiber to the same external disturbance according to the stress of each selected optical fiber in a natural suspension state;
s30, determining the correction stress of each selected optical fiber according to the measurement result of the stress dynamic distribution condition of each selected optical fiber and the coupling coefficient of the corresponding selected optical fiber;
and S40, constructing the three-dimensional shape of the OPGW optical cable according to the shape reduction formula and the correction stress of each selected optical fiber.
In one embodiment, selecting a plurality of optical fibers in the OPGW optical cable as the selected optical fibers in the static state, and separately measuring the stress of each selected optical fiber in the natural suspension state using the distributed optical fiber stress sensing system comprises:
and selecting at least three optical fibers which are symmetrically distributed in the OPGW optical cable as selected optical fibers, and measuring each selected optical fiber by using B-OTDR equipment or phi-OTDR equipment to obtain the stress of each selected optical fiber in a natural suspension state.
In one embodiment, the calculating the coupling coefficient of each selected optical fiber to the same external disturbance according to the stress of each selected optical fiber in the natural suspension state comprises:
in a static state, calculating the optical fiber bending radius of each selected optical fiber according to the stress and the elastic-main strain relation of each selected optical fiber in a natural suspension state, obtaining the optical cable bending radius of the whole optical cable through a mechanical model of the vertical OPGW optical cable in a static state, and calculating the coupling coefficient of each selected optical fiber to the same external disturbance according to the optical fiber bending radius and the optical cable bending radius of each selected optical fiber; the elastic-principal strain relationship is a relationship between a plane which is at a distance of x from a neutral layer of the pure bent optical fiber and a principal strain along the direction of a z axis, the x axis is a first coordinate axis of a coordinate system where the bent optical fiber is located, and the z axis is a third coordinate axis of the coordinate system where the bent optical fiber is located.
In one embodiment, determining the correction stress of each selected optical fiber according to the measurement result of the stress dynamic distribution condition of each selected optical fiber and the coupling coefficient of the corresponding selected optical fiber respectively comprises:
and multiplying the measurement result of the stress dynamic distribution condition of each selected optical fiber by the coupling coefficient of the corresponding selected optical fiber to obtain the correction stress of each selected optical fiber so as to recover the actual stress condition of the whole OPGW optical cable.
In an embodiment, the method for reconstructing dynamic deformation of a power transmission line based on OPGW multi-core stress sensing further includes:
and analyzing and calculating the dynamic parameters of the OPGW optical cable actually required, and determining the parameters of the galloping direction and the galloping amplitude of the optical cable according to the stress of each selected optical fiber in the natural suspension state in the comparison of the three-dimensional form and the static state.
The power transmission line dynamic deformation reconstruction method based on OPGW multi-core stress sensing selects a plurality of optical fibers in an OPGW optical cable as selected optical fibers in a static state, uses a distributed optical fiber stress sensing system to respectively measure the stress of each selected optical fiber in a natural suspension state, respectively calculating the coupling coefficient of each selected optical fiber to the same external disturbance according to the stress of each selected optical fiber in a natural suspension state, determining the correction stress of each selected optical fiber according to the measurement result of the stress dynamic distribution condition of each selected optical fiber and the coupling coefficient of the corresponding selected optical fiber, constructing the three-dimensional shape of the OPGW optical cable according to the shape reduction formula and the correction stress of each selected optical fiber, the method and the device can realize the reconstruction of the corresponding dynamic deformation of the power transmission line, improve the accuracy of the dynamic deformation of the power transmission line obtained by reconstruction and realize the accurate monitoring of the dynamic stress of the OPGW optical cable.
Drawings
Fig. 1 is a flowchart of a power transmission line dynamic deformation reconstruction method based on OPGW multi-core stress sensing according to an embodiment;
FIG. 2 is a schematic view of a bent optical fiber according to one embodiment;
FIG. 3 is a schematic OPGW cable configuration diagram of an embodiment;
FIG. 4 is a cross-sectional geometry diagram of a fiber optic cable according to one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
The monitoring performance of an OPGW (optical fiber composite overhead ground wire) is improved by referring to a multi-core optical fiber. The application provides a dynamic stress monitoring scheme to OPGW optical cable, through obtaining the coupling coefficient of many optic fibres to external force in the OPGW optical cable, then utilize the coupling coefficient to rectify many optic fibres measuring result simultaneously to combine optic fibre shape sensing technology, the three-dimensional form of reduction optical cable finally obtains the dynamic disturbance condition of optical cable. Compared with the original optical cable stress monitoring method, the method can measure the external disturbance amplitude, can restore the disturbance direction, meets more monitoring requirements, and finally realizes the accurate measurement of the OPGW optical cable disturbance.
In an embodiment, referring to fig. 1, fig. 1 is a flowchart of a dynamic deformation reconstruction method for a power transmission line based on OPGW multi-core stress sensing in this embodiment, where multiple optical fibers in an OPGW optical cable are randomly selected, a stress distribution condition of the multiple optical fibers is measured by using a stress sensing system, a corresponding curvature is calculated by using a stress distribution measurement result, and a coupling coefficient of each internal optical fiber to an external acting force is obtained by comparing the corresponding curvature with a curvature of a natural suspension mechanics model of the OPGW optical cable in a static state; and then, carrying out dynamic stress monitoring on the plurality of optical fibers selected before by using a phi-OTDR (optical time domain reflectometer), correcting the obtained direct measurement result by using a coupling coefficient to obtain the amplitude condition of the external acting force, substituting the corrected result into a shape reduction formula Frenet-Serret equation to realize the three-dimensional structure recovery of the optical cable, and finally analyzing to obtain the disturbance direction and the disturbance amplitude information of the optical cable. The method specifically comprises the following steps:
and S10, selecting a plurality of optical fibers in the OPGW optical cable as selected optical fibers in a static state, and respectively measuring the stress of each selected optical fiber in a natural suspension state by using a distributed optical fiber stress sensing system.
In the steps, a plurality of optical fibers in the OPGW optical cable are selected in a static state, and the stress of each optical fiber in a natural suspension state is measured by using a distributed optical fiber stress sensing system, so that the optical fiber stress distribution condition is obtained.
In one embodiment, selecting a plurality of optical fibers in the OPGW optical cable as the selected optical fibers in the static state, and separately measuring the stress of each selected optical fiber in the natural suspension state using the distributed optical fiber stress sensing system comprises:
in a static state, at least three symmetrical optical fibers distributed in an OPGW optical cable are selected as selected optical fibers, and each selected optical fiber is measured by using B-OTDR (Brillouin optical time-domain reflectometer) equipment or phi-OTDR (Phase-sensitive optical time-domain reflectometer) equipment, so that the stress of each selected optical fiber in a natural suspension state is obtained.
In the embodiment, a plurality of optical fibers (selected optical fibers) in the OPGW optical cable can be selected, and three or more optical fibers with symmetrical distribution can be selected; and performing strain measurement on the OPGW optical cable in a static state, wherein B-OTDR equipment and phi-OTDR equipment can be used for measuring the OPGW optical cable in the static state as a preferential option so as to ensure the accuracy of a corresponding measuring result.
And S20, respectively calculating the coupling coefficient of each selected optical fiber to the same external disturbance according to the stress of each selected optical fiber in the natural suspension state.
And respectively calculating the coupling coefficient of each optical fiber to the same external disturbance according to the stress measurement result under the static condition. The method comprises the steps of firstly constructing a mechanical model of the optical cable in a static state, obtaining the sag shape of the whole optical cable to obtain the bending radius of the optical cable, then calculating the bending radius of each optical fiber according to the stress result obtained by measuring each optical fiber, comparing the bending radius of each optical fiber with the bending radius of the whole optical cable, and calculating the coupling coefficient of each optical fiber, wherein the stress condition of each internal optical fiber and the stress condition of the whole optical cable are different due to the self structure of the optical cable (OPGW optical cable).
In one embodiment, the calculating the coupling coefficient of each selected optical fiber to the same external disturbance according to the stress of each selected optical fiber in the natural suspension state comprises:
calculating the optical fiber bending radius of each selected optical fiber according to the stress and elasticity-main strain relation of each selected optical fiber in a natural suspension state, obtaining the optical cable bending radius of the whole optical cable through a mechanical model of the vertical OPGW optical cable in a static state, and calculating the coupling coefficient of each selected optical fiber to the same external disturbance according to the optical fiber bending radius and the optical cable bending radius of each selected optical fiber; the elastic-principal strain relationship is a relationship between a plane which is at a distance of x from a neutral layer of the pure bent optical fiber and a principal strain along the direction of a z axis, the x axis is a first coordinate axis of a coordinate system where the bent optical fiber is located, and the z axis is a third coordinate axis of the coordinate system where the bent optical fiber is located.
In this embodiment, in a static state, the OPGW optical cable under the action of attractive force is in a sag state, and when only axial stress is considered and transverse stress is not considered, a coordinate system as shown in fig. 2 is established, and if the elasticity of the cross section of the optical fiber is uniform and isotropic, the principal strain amount along the z-axis direction from a plane x, which is a neutral layer of the pure bending optical fiber, can be expressed as:
it can be seen that when x>At 0 time ez>0, when x<At 0 time ez<0, i.e., the stress measured in the suspended state under the same external force has a positive or negative value, and this value is related to the distribution position of the optical fiber. Observing enough time, obtaining a measurement result and the relation by using a distributed stress sensing system, calculating the bending radius of each optical fiber according to the measurement stress result, obtaining the bending radius of the whole optical cable by establishing a mechanical model of the OPGW optical cable in a static state, wherein the bending radius obtained by each optical fiber in the static state is different from the integral bending radius R of the optical cable due to certain difference of the stress condition of the internal optical fiber of the optical cable due to the internal structural characteristics of the optical cable, and obtaining the coupling coefficient of each optical fiber when each optical fiber acts on the same external force by comparing the bending radius of each optical fiber with the bending radius of the OPGW optical cable. The coupling coefficient is substituted into a shape reduction formula, more accurate shape recovery is obtained, and the accuracy of subsequent shape reduction is improved. In addition, the relative position of the selected optical fiber is known according to the parameters given by the OPGW optical cable, and the relative position is not changed and has no internal distortion.
S30, determining the correction stress of each selected optical fiber according to the measured stress dynamic distribution condition of each selected optical fiber and the coupling coefficient of the corresponding selected optical fiber.
In one embodiment, determining the correction stress of each selected optical fiber according to the measurement result of the stress dynamic distribution condition of each selected optical fiber and the coupling coefficient of the corresponding selected optical fiber respectively comprises:
and multiplying the measurement result of the stress dynamic distribution condition of each selected optical fiber by the coupling coefficient of the corresponding selected optical fiber to obtain the correction stress of each selected optical fiber so as to recover the actual stress condition of the whole OPGW optical cable.
The stress dynamic distribution is measured by measuring the stress of the corresponding optical fiber (such as the selected optical fiber) during dynamic monitoring.
Furthermore, the dynamic strain measurement can be realized by utilizing the phi-OTDR, the simultaneous measurement of a plurality of optical fibers is adopted, the form of the optical cable can be dynamically measured, and meanwhile, compared with a single optical fiber, the three-dimensional form of the optical cable can be finally analyzed by using the plurality of optical fibers, so that the requirement of obtaining the overall disturbance direction parameter is met. The optical pulses in the phi-OTDR are injected into the optical cable by using a high-speed optical switch, so that the measurement of a plurality of optical fibers is realized.
And S40, constructing the three-dimensional shape of the OPGW optical cable according to the shape reduction formula and the correction stress of each selected optical fiber.
The shape reduction equation may include the Frenet-Serret equation.
In an embodiment, the method for reconstructing dynamic deformation of a power transmission line based on OPGW multi-core stress sensing further includes:
and analyzing and calculating the dynamic parameters of the OPGW optical cable actually required, and determining the parameters of the galloping direction and the galloping amplitude of the optical cable according to the stress of each selected optical fiber in the natural suspension state in the comparison of the three-dimensional form and the static state.
In this embodiment, the Frenet-Serret equation of the shape reduction formula and the corrected measurement result are used to construct the three-dimensional shape of each optical cable, the dynamic parameters of the optical cable required actually are analyzed and calculated, the three-dimensional shape of the optical cable obtained during dynamic measurement and the shape of the optical cable naturally suspended in a static state are placed in the same coordinate system, and parameters such as the waving direction and waving amplitude of the optical cable can be obtained by comparing the coordinates of the optical cable during dynamic measurement and the coordinates of the optical cable during static state
This embodiment introduces this parameter of coupling coefficient, because the manufacturing process and the structural design of OPGW optical cable, when inside different position optic fibre acted on same external force, to the effort coupling condition difference, lead to its stress result of monitoring to be different, can't accurate recovery external effort size, when utilizing many optic fibres to resume optical cable three-dimensional form simultaneously, can't accurate recovery optical cable form. Here, a coupling coefficient is introduced to correct the measurement result. Meanwhile, the invention uses a plurality of optical fibers for simultaneous measurement, and performs optical cable shape reconstruction on the corrected result by using a shape reduction formula to realize the judgment on the optical cable waving direction.
The power transmission line dynamic deformation reconstruction method based on OPGW multi-core stress sensing selects a plurality of optical fibers in an OPGW optical cable as selected optical fibers in a static state, uses a distributed optical fiber stress sensing system to respectively measure the stress of each selected optical fiber in a natural suspension state, respectively calculating the coupling coefficient of each selected optical fiber to the same external disturbance according to the stress of each selected optical fiber in a natural suspension state, respectively determining the correction stress of each selected optical fiber according to the measurement result of the stress dynamic distribution condition of each selected optical fiber and the coupling coefficient of the corresponding selected optical fiber, constructing the three-dimensional shape of the OPGW optical cable according to the shape reduction formula and the correction stress of each selected optical fiber, the method and the device can realize the reconstruction of the corresponding dynamic deformation of the power transmission line, improve the accuracy of the dynamic deformation of the power transmission line obtained by reconstruction and realize the accurate monitoring of the dynamic stress of the OPGW optical cable.
In an embodiment, the structure of the OPGW optical cable may be as shown in fig. 3, and the method for reconstructing the dynamic deformation of the power transmission line based on OPGW multi-core stress sensing may also include the following steps:
selecting a plurality of symmetrical optical fibers distributed in an OPGW optical cable under a static condition, and measuring the stress distribution condition of each optical fiber by using a B-OTDR (optical time Domain reflectometer);
and respectively calculating the stress of each selected optical fiber according to the measurement result of the B-OTDR. Knowing the distance d of the selected optical fiber to the neutral axis of the optical cable according to the parameters of the OPGW optical cableiUsing the measured strain distribution, according to the formula:
deducing the bending radius of each optical fiber as shown by R in figure 2, wherein in a normal state, the static OPGW optical cable is in a sag shape, and comparing the obtained bending radius of each optical fiber with the actual sag of the OPGW optical cable to obtain the coupling coefficient of each optical fiber;
then using phi-OTDR to measure the dynamic stress of the selected optical fiber;
when the OPGW optical cable waves, obtaining a stress measurement result of the phi-OTDR, and correcting the stress measurement result of each optical fiber by using a corresponding coupling coefficient;
and restoring the shape of each optical fiber by utilizing a Frenet-Serret equation according to the corrected result of each optical fiber, and realizing the three-dimensional space form description of the optical cable. The Frenet-Serret equation is expressed as follows:
T′(t)＝s′(t)[1+E(t)]k(t)N(t)
N′(t)＝s′(t)[1+E(t)][-κ(t)N(t)+τ(t)B(t)]
B′(t)＝-s′(t)[1+E(t)]τ(t)N(t)
r(t)＝r0+∫s′(t)[1+E(t)]T(t)dt
where T (t) is the tangent vector of the curve, N (t) is the normal vector of the curve, B (t) is the minor normal vector of the curve, and κ (t) and τ (t) are the curvature function and the curvature function, respectively. Wherein the curvature kappa is 1/R, and R is the bending radius. T is a point on the curve, s' is a length function (curve rate of change), and E (T) is a pressure function. The Frenet-Serret equation describes the behavior of the space curve at each point in space, and the morphology of the fiber can be recovered using this equation.
Firstly, the bending form of the optical cable in the space is judged, a coordinate axis is set along the cross section of the optical cable, because the distribution of the selected optical fibers is symmetrical, the included angle between the bending direction and the x axis of the coordinate axis can be solved according to the formula under the condition, and as shown in fig. 4, the included angle is derived to obtain the winding rate function. And (3) knowing a curvature function and a winding rate function, giving initial conditions, and gradually iterating the formula to obtain a unit tangent vector, a unit principal normal vector, a unit secondary normal vector and a coordinate position of each point on the curve in the most step to complete curve reconstruction. And analyzing the three-dimensional form of the OPGW optical cable to obtain the overall dynamic galloping condition of the OPGW optical cable, including the galloping size and the galloping direction.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
It should be noted that the terms "first \ second \ third" referred to in the embodiments of the present application merely distinguish similar objects, and do not represent a specific ordering for the objects, and it should be understood that "first \ second \ third" may exchange a specific order or sequence when allowed. It should be understood that "first \ second \ third" distinct objects may be interchanged under appropriate circumstances such that the embodiments of the application described herein may be implemented in an order other than those illustrated or described herein.
The terms "comprising" and "having" and any variations thereof in the embodiments of the present application are intended to cover non-exclusive inclusions. For example, a process, method, apparatus, product, or device that comprises a list of steps or modules is not limited to the listed steps or modules but may alternatively include other steps or modules not listed or inherent to such process, method, product, or device.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (4)
1. A power transmission line dynamic deformation reconstruction method based on OPGW multi-core stress sensing is characterized by comprising the following steps:
s10, selecting a plurality of optical fibers in the OPGW optical cable as selected optical fibers in a static state, and respectively measuring the stress of each selected optical fiber in a natural suspension state by using a distributed optical fiber stress sensing system;
s20, respectively calculating the coupling coefficient of each selected optical fiber to the same external disturbance according to the stress of each selected optical fiber in a natural suspension state;
s30, determining the correction stress of each selected optical fiber according to the measurement result of the stress dynamic distribution condition of each selected optical fiber and the coupling coefficient of the corresponding selected optical fiber;
s40, constructing the three-dimensional form of the OPGW optical cable according to the shape reduction formula and the correction stress of each selected optical fiber;
in a static state, selecting a plurality of optical fibers in the OPGW optical cable as selected optical fibers, and respectively measuring the stress of each selected optical fiber in a natural suspension state by using a distributed optical fiber stress sensing system, wherein the stress comprises the following steps:
and selecting at least three optical fibers which are symmetrically distributed in the OPGW optical cable as selected optical fibers, and measuring each selected optical fiber by using a B-OTDR device or a phi-OTDR device to obtain the stress of each selected optical fiber in a natural suspension state.
2. The method of claim 1, wherein the step of respectively calculating the coupling coefficient of each selected optical fiber to the same external disturbance according to the stress of each selected optical fiber in a natural overhang state comprises:
in a static state, calculating the optical fiber bending radius of each selected optical fiber according to the stress and the elastic-main strain relation of each selected optical fiber in a natural suspension state, obtaining the optical cable bending radius of the whole optical cable through a mechanical model of the vertical OPGW optical cable in a static state, and calculating the coupling coefficient of each selected optical fiber to the same external disturbance according to the optical fiber bending radius and the optical cable bending radius of each selected optical fiber; the elastic-principal strain relationship is a relationship between a plane which is at a distance of x from a neutral layer of the pure bent optical fiber and a principal strain along the direction of a z axis, the x axis is a first coordinate axis of a coordinate system where the bent optical fiber is located, and the z axis is a third coordinate axis of the coordinate system where the bent optical fiber is located.
3. The method of claim 1, wherein determining the correction stress of each selected optical fiber according to the measurement result of the stress dynamic distribution condition of each selected optical fiber and the coupling coefficient of the corresponding selected optical fiber comprises:
and multiplying the measurement result of the stress dynamic distribution condition of each selected optical fiber by the coupling coefficient of the corresponding selected optical fiber to obtain the correction stress of each selected optical fiber so as to recover the actual stress condition of the whole OPGW optical cable.
4. The OPGW multi-core stress sensing-based power transmission line dynamic deformation reconstruction method as claimed in claim 1, further comprising:
and analyzing and calculating the dynamic parameters of the OPGW optical cable actually required, and determining the parameters of the galloping direction and the galloping amplitude of the optical cable according to the stress of each selected optical fiber in the natural suspension state in the comparison of the three-dimensional form and the static state.
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