CN114812667A - Transmission conductor detection method, structure and device based on multiple optical fibers - Google Patents
Transmission conductor detection method, structure and device based on multiple optical fibers Download PDFInfo
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Abstract
The invention provides a multi-fiber-based transmission conductor detection method, a multi-fiber-based transmission conductor detection structure and a multi-fiber-based transmission conductor detection device, wherein the method comprises the following steps: respectively obtaining wavelength differences of incident wavelengths and scattering wavelengths of a plurality of optical fibers at a point to be detected to obtain a plurality of groups of wavelength differences corresponding to the optical fibers one by one, wherein the optical fibers are uniformly distributed around the power transmission lead and each optical fiber is consistent with the deformation of the power transmission lead; establishing an equation between the wavelength difference and the to-be-detected parameters of the optical fiber at the to-be-detected point position based on the functional relation between the wavelength difference and the stress change and the temperature of the optical fiber; respectively substituting the multiple groups of wavelength differences into the equation, and solving to obtain parameter values of the parameters to be measured; and taking the parameter value of the parameter to be measured as the deformation parameter value and the temperature value of the power transmission conductor at the point location to be measured, so that the deformation and the temperature of the power transmission conductor at the point location to be measured can be directly, accurately and timely reflected.
Description
Technical Field
The invention relates to the technical field of transmission line detection, in particular to a transmission conductor detection method, a transmission conductor detection structure and a transmission conductor detection device based on multiple optical fibers.
Background
The power transmission conductor is mainly used for power transmission and is commonly used in a power grid system. The transmission line formed by the transmission conductors can be divided into the following structural forms: overhead transmission lines and cable lines. The overhead transmission line is composed of a transmission line tower, a transmission conductor, an insulator, a grounding device and the like and is erected on the ground. In the operation process of the transmission conductor, key parameters such as stress, sag, temperature and the like of the transmission conductor need to be known, data support is provided for operation scheduling of a power grid system, and risks such as icing, lightning stroke, line loss and the like are pre-warned and evaluated, so that the method is an important guarantee for safe and economic operation of the power grid system.
In recent years, methods for measuring or detecting key parameters of power transmission conductors appear successively, for example, optical fibers are added into overhead ground wires as methods for monitoring temperature, stress and line loss, a single optical fiber is mostly adopted in the methods, but the obtained parameters of the overhead ground wires and the parameters of the power transmission conductors have certain difference, and the method for obtaining the parameters according to the single optical fiber also has certain defects; for another example: in part of methods, structures such as a grating and a cavity need to be written in the optical fiber to serve as a distributed sensor, for a long-distance transmission line, the processing difficulty is high, the price is high, and the optical fiber cannot be used for data communication at the same time; in the prior art, the measurement is obtained by other indirect methods such as an on-tower temperature sensor, a stress sensor, a wire inclination angle sensor or video identification. However, the above methods cannot directly and accurately obtain key parameters such as deformation and temperature of the power transmission conductor during operation in real time, and perform abnormal condition judgment and alarm according to the obtained key parameters.
Disclosure of Invention
Therefore, the invention provides a multi-fiber-based transmission conductor detection method, structure and device, aiming at solving the technical problem that key parameters such as deformation, temperature and the like of a transmission conductor during operation cannot be directly detected in the prior art.
According to a first aspect, an embodiment of the present invention provides a multi-fiber-based power transmission conductor detection method, including the following steps:
respectively obtaining wavelength differences of incident wavelengths and scattering wavelengths of a plurality of optical fibers at a point to be detected to obtain a plurality of groups of wavelength differences corresponding to the optical fibers one to one, wherein the optical fibers are uniformly distributed around the power transmission lead, and each optical fiber is consistent with the deformation of the power transmission lead;
establishing an equation between the wavelength difference and parameters to be measured of the optical fibers at the point location to be measured based on the functional relationship between the wavelength difference and the stress change and the temperature of the optical fibers, wherein the parameters to be measured comprise deformation parameters and the temperature of the point location to be measured, and the number of the optical fibers arranged on the power transmission conductor is more than or equal to the number of the types of the parameters to be measured;
respectively substituting the multiple groups of wavelength differences into the equation, and solving to obtain parameter values of the parameters to be measured;
and taking the parameter value of the parameter to be measured as the deformation parameter value and the temperature value of the power transmission conductor at the point position to be measured.
Optionally, the multi-fiber-based power transmission line detection method further includes: and utilizing the parameter values of the parameters to be detected corresponding to the point positions to be detected to calculate the shape of the power transmission conductor and the temperature distribution condition of the power transmission conductor through interpolation.
Optionally, the multi-fiber-based power transmission line detection method further includes: comparing the shape of the power transmission conductor with a standard power transmission conductor shape, and judging whether the shape of the power transmission conductor is abnormal or not; and judging whether the temperature of the transmission conductor body is abnormal or not according to the temperature distribution condition of the transmission conductor.
Optionally, the obtaining a wavelength difference between an incident wavelength and a scattering wavelength of the multiple optical fibers at the point to be measured includes: receiving a light wave pattern corresponding to a plurality of optical fibers one by one, wherein the light wave pattern comprises incident light waves and scattered light waves; and acquiring the wavelength difference between the incident wavelength and the scattering wavelength of the point to be detected on the basis of the light wave diagram.
Optionally, the position of the point to be measured on the optical fibers is obtained through the following steps:
acquiring the transmission time of the scattered light wave of the point location to be detected based on the light wave diagram, wherein the transmission time is the time for transmitting the scattered light wave to a receiving end after a light source transmitting end passes through the point location to be detected;
and calculating the position of the point to be detected from the receiving end according to the product of the transmission time and the light speed.
Optionally, an equation between the wavelength difference and the parameter to be measured of the optical fiber at the point to be measured is:
λ B (x)＝λ B (T 0 ,0)+C T,λ [T(x)-T 0 ]+C T,ε ε(x,R,θ,T)
wherein λ is B Is the difference in wavelength, T 0 As reference temperature, λ B (T 0 0) is the wavelength at which the axial stress is zero at the reference temperature,
is the Brillouin temperature coefficient, C T,ε The Brillouin stress coefficient is shown, epsilon is the axial stress, epsilon (x, R, theta, T) is a stress change function relation, x is the point to be detected, R is the curvature radius, theta is the included angle of the bending plane, and T is the temperature.
Optionally, the substituting the multiple groups of wavelength differences into the equation respectively to obtain parameter values of the parameter to be measured by solving includes: respectively substituting the point to be measured corresponding to the optical fibers and the wavelength difference, the Brillouin temperature coefficient and the Brillouin stress coefficient which respectively correspond to the optical fibers into the equation to obtain an equation set corresponding to the number of the optical fibers; and (4) connecting the equation sets, and calculating to obtain the parameter value of the parameter to be measured.
According to a second aspect, an embodiment of the present invention provides a multi-fiber-based power conductor detection structure for performing any one of the above-mentioned multi-fiber-based power conductor detection methods, including: the optical fiber comprises a force bearing core, at least two pairs of optical fibers and a conducting layer;
the optical fibers are evenly and equally distributed outside the bearing core, or evenly and equally distributed inside the bearing core;
one end of the optical fiber is connected with the laser light source and is connected with the first receiving device, or one end of the optical fiber is connected with the laser light source and the other end of the optical fiber is connected with the first receiving device;
the optical fiber and the bearing core are both positioned in the conducting layer.
According to a third aspect, an embodiment of the present invention provides a multi-fiber based power transmission conductor detection apparatus, including:
the acquisition module is used for respectively acquiring wavelength differences of incident wavelengths and scattering wavelengths of a plurality of optical fibers at a point to be detected to obtain a plurality of groups of wavelength differences corresponding to the optical fibers one to one, wherein the optical fibers are uniformly distributed around the power transmission lead, and each optical fiber has the same deformation with the power transmission lead;
the function module is used for establishing an equation between the wavelength difference and parameters to be measured of the optical fibers at the point location to be measured based on a functional relation between the wavelength difference and stress change and temperature of the optical fibers, wherein the parameters to be measured comprise deformation parameters and temperature of the point location to be measured, and the number of the optical fibers arranged on the power transmission lead is more than or equal to the number of the types of the parameters to be measured;
the calculation module is used for respectively substituting the multiple groups of wavelength differences into the equation and solving to obtain parameter values of the parameters to be measured;
and the corresponding module is used for taking the parameter value of the parameter to be measured as the deformation parameter value and the temperature value of the power transmission conductor at the point position to be measured.
According to a fourth aspect, an embodiment of the present invention provides a computer device, including: a memory and a processor, the memory and the processor being communicatively coupled to each other, the memory having stored therein computer instructions, the processor executing the computer instructions to perform the multi-fiber based power conductor detection method described above.
According to a fifth aspect, embodiments of the present invention provide a computer-readable storage medium having stored thereon computer instructions for causing a computer to execute the above-described multi-fiber based power conductor detection method.
The technical scheme of the invention has the following advantages:
1. the method comprises the steps of respectively obtaining wavelength differences of incident wavelengths and scattering wavelengths of a plurality of optical fibers at a point to be detected, obtaining a plurality of groups of wavelength differences corresponding to the optical fibers one by one, establishing an equation between the wavelength differences and parameters to be detected of the optical fibers at the point to be detected based on the functional relation between the wavelength differences and stress changes and temperatures of the optical fibers, respectively substituting the plurality of groups of wavelength differences corresponding to the optical fibers one by one into the equation, simultaneously solving to obtain parameter values of the parameters to be detected of the point to be detected, and taking the parameter values of the parameters to be detected as deformation parameter values and temperature values of the power transmission lead at the point to be detected. The plurality of optical fibers are arranged inside the power transmission conductor, and the parameter value of the parameter to be measured of the point location to be measured is used as the deformation parameter value and the temperature value of the power transmission conductor at the point location to be measured, so that the deformation and the temperature of the power transmission conductor at the point location to be measured can be directly, accurately and timely reflected.
2. The shape of the power transmission conductor calculated by interpolation is compared with the shape of the standard conductor, so that the power transmission conductor to be detected can be visually reflected, namely the abnormality of the power transmission conductor calculated by interpolation can be accurately detected to the abnormality of a certain point position to be detected, and the abnormal position of the power transmission conductor can be directly positioned.
3. The optical fibers are arranged outside or inside the bearing core in pairs, the arrangement mode adopts axisymmetric arrangement, which is not only beneficial to the accuracy and the consistency of the measured stress, but also convenient for processing, and furthermore, a plurality of optical fibers are added in the transmission conductor or the cable, which not only can be used as a sensor, but also can be used as a communication carrier.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flowchart of a specific example of a multi-fiber-based power transmission conductor detection method according to embodiment 1 of the present invention;
fig. 2 is a structural view of a specific example of a multi-fiber-based power transmission conductor inspection structure in embodiment 2 of the present invention;
fig. 3 is a structural view of another specific example of a multi-fiber-based power conductor inspection structure in embodiment 2 of the present invention;
fig. 4 is a schematic block diagram of a specific example of a multi-fiber-based power transmission conductor detection apparatus according to embodiment 3 of the present invention;
fig. 5 is a schematic structural diagram of a specific example of a computer device in embodiment 4 of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
The present embodiment provides a method for detecting a power transmission conductor based on multiple optical fibers, which can collect and detect a oscillogram of a light source propagating in an optical fiber by a distributed optical fiber sensor and the like, analyze and process data collected and detected by the distributed optical fiber sensor by a device such as a server, and calculate, output and distinguish the analyzed and processed data by the device such as the server, thereby realizing detection of the power transmission conductor, as shown in fig. 1, including the following steps:
step S101, wavelength differences of incident wavelengths and scattering wavelengths of a plurality of optical fibers at a point to be detected are respectively obtained, and a plurality of groups of wavelength differences corresponding to the optical fibers one to one are obtained, wherein the optical fibers are uniformly distributed around the power transmission lead, and deformation of each optical fiber is consistent with that of the power transmission lead.
The power transmission lead mainly comprises a steel-cored aluminum strand, a carbon fiber composite material core and the like, plays a role in transferring electric energy from a power supply to a power load center, and occupies an extremely important position in a power transmission line. The transmission conductor is exposed to high-altitude environment all the year round, and severe environmental factors such as high temperature, strong wind, freezing, rain and snow have very important influence on the transmission performance and the safety performance of the transmission conductor.
In this embodiment, a plurality of optical fibers may be added to the power transmission conductor, and each optical fiber may be uniformly distributed between the force-bearing core and the conductive layer of the power transmission conductor or inside the force-bearing core of the power transmission conductor, as shown in fig. 2 and 3. Because the optical fibers are uniformly distributed between the bearing core and the conducting layer of the power transmission conductor or inside the bearing core of the power transmission conductor, the deformation parameters and the temperature of the power transmission conductor can be obtained by detecting the deformation parameters and the temperature of a plurality of optical fibers inside the power transmission conductor. The temperature and deformation on a certain cross section of the power transmission conductor are the same as the temperature and deformation of the optical fiber on the same cross section.
The point to be measured may be a point where temperature change or deformation occurs on a certain cross section of the power transmission line, and in this embodiment, a raman scattering optical time domain reflective sensor or a brillouin scattering optical time domain reflective sensor may be used to collect a waveform diagram of a light source after being propagated through an optical fiber. In this embodiment, for example, four optical fibers are arranged in the power transmission conductor, four oscillograms of the light source after propagating through the optical fibers can be collected by the sensor, and each oscillogram corresponds to one optical fiber.
The incident light source is transmitted in the optical fiber, and can generate scattering to a certain extent under the influence of temperature or stress, but the wavelengths of scattered light waves are different according to different temperatures and different strain degrees, that is, the incident light source can generate scattering to different extents at different positions of the optical fiber, and the wavelengths of the scattered light are different.
In this embodiment, taking four optical fibers arranged in a power transmission conductor as an example, through collected oscillograms of incident light sources respectively propagating in the four optical fibers, wavelength differences between four incident wavelengths and scattering wavelengths corresponding to point locations to be measured in the four oscillograms are analyzed, where the point locations to be measured may be a certain location or multiple locations on the power transmission conductor where the wavelength difference between the incident wavelengths and the scattering wavelengths is large. As described above, the deformation and temperature change of the four optical fibers at the point to be measured are the same, but the wavelength difference between the incident wavelength and the scattering wavelength is different due to the different positions of the four optical fibers on the power transmission conductor.
Step S102, establishing an equation between the wavelength difference and the parameter to be measured of the optical fiber at the point location to be measured based on the functional relation between the wavelength difference and the stress change and the temperature of the optical fiber, wherein the parameter to be measured comprises the deformation parameter and the temperature of the point location to be measured, and the number of the optical fibers arranged on the power transmission lead is more than or equal to the number of the types of the parameter to be measured.
As described above, the wavelength difference between the incident wavelength and the scattering wavelength is related to the deformation and temperature of the power transmission line or the optical fiber, and therefore, an equation between the wavelength difference and the parameter to be measured of the optical fiber at the point to be measured can be established based on the functional relationship between the wavelength difference and the stress change and temperature of the optical fiber. The deformation is mainly caused by stress variations, so that the wavelength difference is a function of the stress variations and the temperature. The functional relationships and equations are described in detail below.
The deformation of the power transmission conductor on the point location to be measured also directly causes the change of the curvature radius and the included angle of the bending plane of the power transmission conductor on the point location to be measured, thereby the deformation of the power transmission conductor on the point location to be measured directly causes the change of the curvature radius and the included angle of the bending plane of the power transmission conductor on the point location to be measured. Equations between the wavelength difference and the curvature radius, the included angle of the bending plane and the temperature can be established based on the functional relation between the wavelength difference and the stress change and the temperature of the optical fiber, and the deformation parameter can comprise the included angle of the curvature radius and the included angle of the bending plane. And a plurality of parameters to be measured exist in the equation, so the number of the optical fibers distributed on the power transmission conductor needs to be more than or equal to the number of the types of the parameters to be measured.
And step S103, respectively substituting the multiple groups of wavelength differences into the equation, and solving to obtain parameter values of the parameters to be measured.
And step S104, taking the parameter value of the parameter to be measured as the deformation parameter value and the temperature value of the power transmission conductor at the point position to be measured.
As described above, in this embodiment, four optical fibers are disposed in the power transmission line as an example, so that there are four wavelength differences at one point to be measured, the four wavelength differences are respectively substituted into the equations, and the parameter values of the parameter to be measured, that is, the curvature radius, the included angle of the bending plane, and the temperature, are obtained through simultaneous solution. The curvature radius, the included angle of the bending plane and the temperature of the point location to be measured obtained by the solution can be used as the deformation parameter value and the temperature value of the power transmission conductor at the point location to be measured, namely the curvature radius, the included angle of the bending plane and the temperature.
In this embodiment, wavelength differences between incident wavelengths and scattering wavelengths of a plurality of optical fibers at a point to be measured are obtained respectively, a plurality of groups of wavelength differences corresponding to the plurality of optical fibers one to one are obtained, an equation between the wavelength differences and parameters to be measured of the optical fibers at the point to be measured is established based on a functional relationship between the wavelength differences and stress changes and temperatures of the optical fibers, the plurality of groups of wavelength differences corresponding to the plurality of optical fibers one to one are respectively substituted into the equation, simultaneous solution is performed to obtain parameter values of the parameters to be measured of the point to be measured, and the parameter values of the parameters to be measured are used as deformation parameter values and temperature values of the power transmission conductor at the point to be measured. The plurality of optical fibers are arranged inside the power transmission conductor, and the parameter value of the parameter to be measured of the point location to be measured is used as the deformation parameter value and the temperature value of the power transmission conductor at the point location to be measured, so that the deformation and the temperature of the power transmission conductor at the point location to be measured can be directly, accurately and timely reflected.
As an optional implementation manner, in the embodiment of the present invention, the method further includes: and utilizing the parameter values of the parameters to be detected corresponding to the point positions to be detected to calculate the shape of the power transmission conductor and the temperature distribution condition of the power transmission conductor through interpolation.
The multiple points to be detected on the multiple optical fibers can be obtained according to the acquired oscillogram, wherein a single point to be detected corresponds to the same position on the multiple optical fibers, and multiple points to be detected correspond to different positions on the multiple optical fibers.
The parameter values of the parameter to be measured corresponding to each point location to be measured, which include the curvature radius and the included angle of the bending plane, can be obtained by solving the equation by using the multiple groups of wavelength differences corresponding to each point location to be measured, and the shape of the collected power transmission line can be calculated by interpolation according to the curvature radius and the included angle of the bending plane of each point location to be measured. The parameter values of the parameters to be measured also comprise temperatures, and the distribution condition of the temperatures of the point locations to be measured on the power transmission conductors can be reflected according to the temperatures of the point locations to be measured.
As an optional implementation manner, in the embodiment of the present invention, the method further includes:
comparing the shape of the power transmission conductor with a standard power transmission conductor shape, and judging whether the shape of the power transmission conductor is abnormal or not; and judging whether the temperature of the transmission conductor body is abnormal or not according to the temperature distribution condition of the transmission conductor.
The shape of the standard transmission conductor can be that the deformation parameter of any point on the transmission conductor respectively meets the preset deformation parameter value of each point in a normal temperature environment; based on the preset deformation parameter values of each point, various standard power transmission conductor shapes can be calculated.
And comparing the shape of the power transmission conductor calculated by interpolation with the shape of a standard power transmission conductor, and judging whether the shape of the power transmission conductor calculated by interpolation is abnormal, such as excessive sag, lightning stroke, local line loss and the like caused by ice coating. The comparison can also be carried out on the parameter values of the parameters to be measured at the positions of the points to be measured, and when abnormal conditions occur, early warning is started.
According to the distribution condition of the temperature of each point location to be detected on the power transmission conductor, whether the temperature of the power transmission conductor is abnormal or not is judged, whether the temperature exceeds a preset temperature threshold value or not can be judged, and when the abnormal condition occurs, early warning is started.
In this embodiment, the shape of the power transmission conductor calculated by interpolation is compared with the shape of the standard conductor, so that the abnormality of the power transmission conductor to be detected, that is, the abnormality of the power transmission conductor calculated by interpolation, can be accurately detected to a certain point to be detected, and the abnormal position of the power transmission conductor can be directly located.
As an optional implementation manner, in an embodiment of the present invention, the obtaining a wavelength difference between an incident wavelength and a scattering wavelength of the multiple optical fibers at the point to be measured includes:
receiving a light wave pattern corresponding to a plurality of optical fibers one by one, wherein the light wave pattern comprises incident light waves and scattered light waves; and acquiring the wavelength difference between the incident wavelength and the scattering wavelength at the point to be detected based on the lightwave chart.
As described above, the incident light source is transmitted inside the optical fiber, and the incident light source generates a certain degree of scattering under the influence of temperature or stress, but the wavelengths of the scattered light waves are different according to the difference of temperature and the difference of strain, that is, the incident light source generates different degrees of scattering at different positions of the optical fiber, and the wavelengths of the scattered light are different. A plurality of oscillograms of a light source after being transmitted by a plurality of optical fibers can be respectively collected through a sensor, and each oscillogram corresponds to one optical fiber. And acquiring the wavelength difference between the multiple groups of incident wavelengths and the scattering wavelengths at the point to be detected based on each light wave map.
As an optional implementation manner, in the embodiment of the present invention, the position of the point to be measured on the optical fibers is obtained through the following steps:
acquiring the transmission time of the scattered light wave of the point location to be detected based on the light wave diagram, wherein the transmission time is the time for transmitting the scattered light wave to a receiving end after a light source transmitting end passes through the point location to be detected;
and calculating the position of the point to be detected from the receiving end according to the product of the transmission time and the light speed.
After the incident light source is transmitted inside the optical fiber and scattered by the point location to be detected, the time for receiving scattered light waves is collected through a receiving end, and the receiving end can be any sensor or other equipment for collecting light wave signals. If the receiving end is arranged at the same end as the light source transmitting end, the time for receiving the scattered light wave needs to be doubled as the transmission time for sending and receiving, the light speed is a fixed value, and the position of the point to be measured from the receiving end can be calculated according to the product of the transmission time and the light speed.
If the receiving end is arranged at the other end of the light source transmitting end, the position of the point location to be detected from the receiving end can be calculated according to the product of the transmission time and the light speed by only acquiring the time of the scattered light waves transmitted from the point location to be detected to the receiving end.
As an optional implementation manner, in an embodiment of the present invention, an equation between the wavelength difference and the parameter to be measured of the optical fiber at the point to be measured is:
λ B (x)＝λ B (T 0 ,0)+C T,λ [T(x)-T 0 ]+C T,ε ε(x,R,θ,T)
wherein λ is B Is the difference in wavelength, T 0 As reference temperature, λ B (T 0 0) is the wavelength at which the axial stress is zero at the reference temperature,
is the Brillouin temperature coefficient, C T,ε The Brillouin stress coefficient is shown, epsilon is the axial stress, epsilon (x, R, theta, T) is a stress change function relation, x is the point to be detected, R is the curvature radius, theta is the included angle of the bending plane, and T is the temperature.
Further, the Brillouin temperature coefficient
Coefficient of stress with Brillouin T,ε Can be obtained by direct calculation of the sensor, T 0 The temperature can be normal temperature, theta is an included angle between a bending plane and a vertical plane, and T is the temperature of the point to be measured; second, ε (x, R, θ, T) is a function of stress variation, i.e. a function of x, R, θ, T, specifically:
r 0i is the cross section of the point to be measured x on the ith optical fiber at the reference temperature, the distance from the optical fiber of the point to be measured x to the center of the power transmission conductor, alpha is the expansion coefficient of the power transmission conductor, and theta i Is the cross section of the point to be measured x on the ith optical fiber, the azimuth angle of the optical fiber of the point to be measured x in the power transmission conductor, theta is the included angle of the bending plane, R is the curvature radius, T 0 For reference temperature, T is temperature, i.e. the temperature at the point to be measured, and i is a constant.
As an optional implementation manner, in an embodiment of the present invention, the respectively substituting the multiple groups of wavelength differences into the equations to obtain parameter values of the parameters to be measured by solving includes:
respectively corresponding the point to be detected corresponding to the optical fibers and the wavelength difference lambda corresponding to the optical fibers B The Brillouin temperature coefficient
The Brillouin stress coefficient C T,ε Respectively substituting the optical fibers into the equations to obtain equation sets corresponding to the number of the optical fibers; and (4) connecting the equation sets, and calculating to obtain the parameter value of the parameter to be measured.
Taking a specific point to be measured of four optical fibers as an example, data obtained by collection and calculation is substituted into an equation, specifically:
four optical fibers corresponding to four groups of wavelength differences lambda B Four groups of Brillouin temperature coefficients
Four groups of Brillouin stress coefficients C T,ε Forming an equation set and a simultaneous equation set, calculating the parameter values of the parameter to be measured, namely, the curvature radius R, the included angle theta of the bending plane, the temperature T and the wavelength lambda of the reference temperature at which the axial stress is zero B (T 0 ,0)。
And if a plurality of point positions to be detected on the transmission conductor need to be calculated, repeating the steps.
Example 2
This embodiment provides a multi-fiber-based power conductor inspection structure that can be used to perform the multi-fiber-based power conductor inspection method of embodiment 1 described above, as shown in fig. 2 and 3, the structure including: the optical fiber comprises a force bearing core, at least two pairs of optical fibers and a conducting layer;
the optical fibers are evenly and equally distributed outside the bearing core, or evenly and equally distributed inside the bearing core;
one end of the optical fiber is connected with the laser light source and is connected with the first receiving device, or one end of the optical fiber is connected with the laser light source and the other end of the optical fiber is connected with the first receiving device;
the optical fiber and the bearing core are both positioned in the conductive layer.
In this embodiment, according to the type of the messenger core of the power transmission conductor, for example: steel core, carbon-fibre composite core etc. the conducting layer material, like: the optical fiber is connected with the bearing core in a corresponding packaging mode, such as metal cladding, resin curing and the like, according to the material parameters of the bearing core and the conducting layer, so that the axial deformation of the optical fiber is consistent with that of the power transmission conductor.
The laser light source can be connected with one end of the optical fiber through the coupler, one end of the same side or one end of the different side of the optical fiber is connected with the sensor through a fusion or optical fiber connector, the sensor can be a Raman scattering optical time domain reflection type sensor or a Brillouin scattering optical time domain reflection type sensor, deformation and temperature distribution in each optical fiber are measured simultaneously, and the sensor can be arranged on a power transmission line tower or in a power transformation converter station.
In the embodiment, the optical fibers are arranged outside or inside the bearing core in pairs, the arrangement mode adopts axisymmetric arrangement, which is not only beneficial to the accuracy and consistency of the measured stress, but also convenient for processing, and furthermore, a plurality of optical fibers are added into a transmission lead or a cable, which not only can be used as a sensor, but also can be used as a communication carrier.
Example 3
This embodiment provides a multi-fiber-based transmission conductor detecting apparatus, which can be used to perform the multi-fiber-based transmission conductor detecting method of embodiment 1, and can be disposed inside a server, a sensor or other devices, and the modules cooperate with each other to realize the multi-fiber-based transmission conductor detecting method, as shown in fig. 4, and the apparatus includes:
the obtaining module 201 is configured to obtain wavelength differences between incident wavelengths and scattering wavelengths of multiple optical fibers at a point to be detected, and obtain multiple groups of wavelength differences corresponding to the multiple optical fibers one to one, where the multiple optical fibers are uniformly distributed around the power transmission conductor, and deformation of each optical fiber is consistent with deformation of the power transmission conductor.
And the function module 202 is configured to establish an equation between the wavelength difference and a parameter to be measured of the optical fiber at the point to be measured based on a functional relationship between the wavelength difference and stress variation and temperature of the optical fiber, where the parameter to be measured includes a deformation parameter and temperature of the point to be measured, and the number of the optical fibers arranged on the power transmission line is greater than or equal to the number of the types of the parameter to be measured.
And the calculating module 203 is configured to substitute the multiple groups of wavelength differences into the equations respectively, and solve to obtain parameter values of the parameters to be measured.
A corresponding module 204, configured to use the parameter value of the parameter to be measured as a deformation parameter value and a temperature value of the power transmission line at the point location to be measured.
In this embodiment, wavelength differences of incident wavelengths and scattering wavelengths of a plurality of optical fibers at a point to be measured are respectively obtained, multiple groups of wavelength differences corresponding to the optical fibers one to one are obtained, an equation between the wavelength differences and parameters to be measured of the optical fibers at the point to be measured is established based on a functional relationship between the wavelength differences and stress changes and temperatures of the optical fibers, the multiple groups of wavelength differences corresponding to the optical fibers one to one are respectively substituted into the equation, simultaneous solution is performed to obtain parameter values of the parameters to be measured of the point to be measured, and the parameter values of the parameters to be measured are used as deformation parameter values and temperature values of the power transmission line at the point to be measured. The plurality of optical fibers are arranged inside the power transmission conductor, and the parameter value of the parameter to be measured of the point location to be measured is used as the deformation parameter value and the temperature value of the power transmission conductor at the point location to be measured, so that the deformation and the temperature of the power transmission conductor at the point location to be measured can be directly, accurately and timely reflected.
For the detailed description of the above apparatus, reference may be made to the above method embodiments, which are not described herein again.
Example 4
The present embodiment provides a computer device, as shown in fig. 5, the computer device includes a processor 301 and a memory 302, where the processor 301 and the memory 302 may be connected by a bus or by other means, and fig. 5 takes the connection by a bus as an example.
The memory 302 may further include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created by the processor 301, and the like. Further, the memory 302 may include high speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, the memory 302 may optionally include memory located remotely from the processor 301, which may be connected to the processor 301 via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The memory 302 stores one or more modules that, when executed by the processor 301, perform a multi-fiber based power conductor detection method as in the embodiment of fig. 1.
The details of the computer device can be understood with reference to the corresponding related descriptions and effects in the embodiment shown in fig. 1, and are not described herein again.
An embodiment of the present invention further provides a computer-readable storage medium, where computer-executable instructions are stored, and the computer-executable instructions may execute the multi-fiber-based power transmission conductor detection method in any of the above embodiments. The storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a Flash Memory (Flash Memory), a Hard Disk (Hard Disk Drive, abbreviated as HDD), a Solid State Drive (SSD), or the like; the storage medium may also comprise a combination of memories of the kind described above.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (11)
1. A multi-optical fiber-based transmission conductor detection method is characterized by comprising the following steps:
respectively obtaining wavelength differences of incident wavelengths and scattering wavelengths of a plurality of optical fibers at a point to be detected to obtain a plurality of groups of wavelength differences corresponding to the optical fibers one by one, wherein the optical fibers are uniformly distributed around the power transmission lead and each optical fiber is consistent with the deformation of the power transmission lead;
establishing an equation between the wavelength difference and parameters to be measured of the optical fibers at the point location to be measured based on the functional relationship between the wavelength difference and the stress change and the temperature of the optical fibers, wherein the parameters to be measured comprise deformation parameters and the temperature of the point location to be measured, and the number of the optical fibers arranged on the power transmission conductor is more than or equal to the number of the types of the parameters to be measured;
respectively substituting the multiple groups of wavelength differences into the equation, and solving to obtain parameter values of the parameters to be measured;
and taking the parameter value of the parameter to be measured as the deformation parameter value and the temperature value of the power transmission conductor at the point position to be measured.
2. The multi-fiber based power conductor inspection method of claim 1, further comprising: and utilizing the parameter values of the parameters to be detected corresponding to the point positions to be detected to calculate the shape of the power transmission conductor and the temperature distribution condition of the power transmission conductor through interpolation.
3. The multi-fiber based power conductor inspection method of claim 2, further comprising:
comparing the shape of the power transmission conductor with a standard power transmission conductor shape, and judging whether the shape of the power transmission conductor is abnormal or not;
and judging whether the temperature of the transmission conductor body is abnormal or not according to the temperature distribution condition of the transmission conductor.
4. The multi-fiber-based power transmission line detection method according to claim 1, wherein the obtaining a wavelength difference between an incident wavelength and a scattering wavelength of the plurality of optical fibers at the point-to-be-detected location includes:
receiving a light wave pattern corresponding to a plurality of optical fibers one by one, wherein the light wave pattern comprises incident light waves and scattered light waves;
and acquiring the wavelength difference between the incident wavelength and the scattering wavelength of the point to be detected on the basis of the light wave diagram.
5. The multi-fiber-based power transmission conductor detection method according to claim 4, wherein the position of the point-to-be-detected on the plurality of optical fibers is obtained by:
acquiring the transmission time of the scattered light wave of the point location to be detected based on the light wave diagram, wherein the transmission time is the time for transmitting the scattered light wave to a receiving end after a light source transmitting end passes through the point location to be detected;
and calculating the position of the point to be detected from the receiving end according to the product of the transmission time and the light speed.
6. The multi-fiber-based power transmission line detection method according to claim 1, wherein an equation between the wavelength difference and the parameter to be measured of the optical fiber at the point-to-be-measured is as follows:
λ B (x)＝λ B (T 0 ,0)+C T,λ [T(x)-T 0 ]+C T,ε ε(x,R,θ,T)
wherein λ is B Is the wavelength difference, T 0 As reference temperature, λ B (T 0 0) is the wavelength at which the axial stress is zero at the reference temperature, C T,λ Is the Brillouin temperature coefficient, C T,ε The Brillouin stress coefficient is shown, epsilon is the axial stress, epsilon (x, R, theta, T) is a stress change function relation, x is the point to be detected, R is the curvature radius, theta is the included angle of the bending plane, and T is the temperature.
7. The multi-fiber-based transmission conductor detection method according to claim 6, wherein the step of solving the parameter values of the parameter to be detected by respectively substituting the plurality of groups of wavelength differences into the equations comprises:
respectively substituting the point to be measured corresponding to the optical fibers and the wavelength difference, the Brillouin temperature coefficient and the Brillouin stress coefficient which respectively correspond to the optical fibers into the equation to obtain an equation set corresponding to the number of the optical fibers;
and (4) connecting the equation sets, and calculating to obtain the parameter value of the parameter to be measured.
8. A multi-fiber based transmission conductor inspection structure for performing the multi-fiber based transmission conductor inspection method of any one of claims 1-7, comprising: the optical fiber comprises a force bearing core, at least two pairs of optical fibers and a conducting layer;
the optical fibers are evenly and equally distributed outside the bearing core, or evenly and equally distributed inside the bearing core;
one end of the optical fiber is connected with the laser light source and is connected with the first receiving device, or one end of the optical fiber is connected with the laser light source and the other end of the optical fiber is connected with the first receiving device;
the optical fiber and the bearing core are both positioned in the conducting layer.
9. A multi-fiber based transmission conductor inspection apparatus comprising:
the acquisition module is used for respectively acquiring wavelength differences of incident wavelengths and scattering wavelengths of a plurality of optical fibers at a point to be detected to obtain a plurality of groups of wavelength differences corresponding to the optical fibers one by one, wherein the optical fibers are uniformly distributed around the power transmission lead, and each optical fiber has the same deformation with the power transmission lead;
the function module is used for establishing an equation between the wavelength difference and parameters to be measured of the optical fibers at the point location to be measured based on a functional relation between the wavelength difference and stress change and temperature of the optical fibers, wherein the parameters to be measured comprise deformation parameters and temperature of the point location to be measured, and the number of the optical fibers arranged on the power transmission lead is more than or equal to the number of the types of the parameters to be measured;
the calculation module is used for respectively substituting the multiple groups of wavelength differences into the equation and solving to obtain parameter values of the parameters to be measured;
and the corresponding module is used for taking the parameter value of the parameter to be measured as the deformation parameter value and the temperature value of the power transmission conductor at the point position to be measured.
10. A computer device, comprising:
a memory and a processor communicatively coupled to each other, the memory having stored therein computer instructions, the processor executing the computer instructions to perform the multi-fiber based power conductor detection method of any of claims 1-7.
11. A computer-readable storage medium having stored thereon computer instructions for causing a computer to perform the multi-fiber based power conductor detection method of any one of claims 1-7.
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