A method, device and storage medium for monitoring the state of a transmission line

Abstract

The present invention discloses a method, device, and storage medium for monitoring the status of a power transmission line. The transmission line status monitoring method provided by an embodiment of the present invention calculates the longitudinal expansion and contraction deformation of the transmission line between two adjacent towers due to sag based on the wavelength of laser light reflected by each fiber grating sensor, constructs a sag function that reflects the relationship between the sag of any point on the transmission line between the two adjacent towers and the X-axis coordinate of the point, calculates the maximum value of the sag function, constructs a stress function that reflects the relationship between the stress of any point on the transmission line between the two adjacent towers and the X-axis coordinate of the point, and calculates the maximum value of the stress function. The present invention uses multiple fiber grating sensors to monitor the sag, stress, and line length of the transmission line in real time. The monitoring accuracy and efficiency are high, and the maintenance costs and power outage risks caused by sudden failures can be significantly reduced, thereby improving the stability and reliability of the entire power grid.

Description

Technical Field

[0001] The present invention relates to a power transmission line monitoring technology, and in particular to a power transmission line status monitoring method, device and storage medium. Background Art

[0002] With the rapid development of power grids and the continuous growth of electricity demand, the stable and safe operation of transmission lines is crucial to ensuring grid reliability and power supply continuity. Overhead transmission lines, exposed to complex and changing natural environments for long periods of time, must withstand the combined effects of various factors, including their own weight, wind pressure, temperature fluctuations, and icing. These environmental factors not only cause changes in the stress state, line length, and sag of transmission lines, but may also cause line galloping, thereby increasing the risk of safe operation and maintenance costs. Transmission lines face particularly severe safety challenges in severe weather conditions, such as high winds or icy conditions. Therefore, accurately monitoring and assessing the status of transmission lines in real time, identifying potential safety hazards, and taking preventive measures have become a critical task in power system management.

[0003] Currently, traditional transmission line monitoring methods primarily include manual inspections and indirect monitoring. While these methods provide some support for the safe operation and maintenance of transmission lines, they often fail to provide accurate information on the real-time status of transmission lines. This is particularly true in areas with harsh climates or difficult-to-reach areas, where monitoring accuracy and efficiency are significantly compromised. Summary of the Invention

[0004] The present invention provides a method, device and storage medium for monitoring the status of a power transmission line, so as to improve accuracy and efficiency and enhance the stability and reliability of the entire power grid.

[0005] In a first aspect, the present invention provides a method for monitoring the status of a power transmission line. A plurality of optical fibers are laid along the extension direction of the power transmission line, and a fiber Bragg grating sensor is provided in the optical fiber at the connection between the power transmission line and the tower. The method comprises:

[0006] Acquire the laser data signal reflected by each fiber Bragg grating sensor uploaded by the laser receiver, and determine the wavelength of the laser reflected by the fiber Bragg grating sensor based on the laser data signal;

[0007] The expansion and contraction deformation of the transmission line in the longitudinal direction caused by sag between two adjacent towers is calculated based on the wavelength of the laser reflected by each fiber Bragg grating sensor;

[0008] A rectangular coordinate system is constructed with the connection point between the lower tower and the transmission line as the origin, the horizontal direction along the transmission line as the X-axis, and the vertical direction as the Y-axis. A sag function is constructed to reflect the relationship between the sag of any point on the transmission line between the two adjacent towers and the X-axis coordinate of the point.

[0009] Calculating the maximum value of the sag function to obtain the maximum sag on the transmission line between two adjacent towers;

[0010] The transmission line between two adjacent towers is equivalent to a catenary model, and based on the rectangular coordinate system, a stress function is constructed to reflect the relationship between the stress of any point on the transmission line between the two adjacent towers and the X-axis coordinate of the point;

[0011] The maximum value of the stress function is calculated to obtain the maximum stress on the transmission line between two adjacent towers.

[0012] Optionally, three optical fibers are laid along the extension direction of the transmission line, and each optical fiber is provided with a fiber grating sensor at the connection between the transmission line and the tower, namely a first fiber grating sensor, a second fiber grating sensor and a third fiber grating sensor. Among them, the first fiber grating sensor is used to measure the sag change of the transmission line, the second fiber grating sensor is used to measure the line length change caused by thermal expansion and contraction of the transmission line due to changes in ambient temperature, and the third fiber grating sensor is sensitive to temperature but insensitive to strain, and is used for temperature compensation.

[0013] Optionally, calculating the expansion and contraction deformation of the transmission line between two adjacent towers due to sag in the longitudinal direction based on the wavelength of the laser reflected by each fiber Bragg grating sensor includes:

[0014] using the wavelength of the laser signal reflected by the third fiber grating sensor as the first wavelength of the reflected light caused by the change in ambient temperature;

[0015] Calculating the difference between the wavelength of the laser signal reflected by the second fiber grating sensor and the first wavelength to obtain a second wavelength representing the reflected light caused by the expansion and contraction of the transmission line due to the change in ambient temperature;

[0016] Calculating a difference between a wavelength of the laser signal reflected by the first fiber grating sensor and the second wavelength to obtain a third wavelength representing reflected light caused by transmission line sag;

[0017] The expansion and contraction deformation in the length direction caused by the sag of the transmission line is calculated based on the third wavelength and the intrinsic properties of the first fiber grating sensor.

[0018] Optionally, the expansion and contraction deformation in the longitudinal direction caused by the sag of the transmission line is calculated based on the third wavelength and the intrinsic properties of the first fiber grating sensor, and the calculation formula is as follows:

[0019]

[0020] Among them, Λ fij is the third wavelength, λ 1BijThe initial reflection wavelength of the first fiber Bragg grating sensor at the jth tower, p e is the photoelastic coefficient.

[0021] Optionally, the sag function is:

[0022]

[0023] Where x represents the horizontal coordinate of the point on the transmission line in the rectangular coordinate system, l is the horizontal distance between two adjacent towers, h is the height difference between towers of different heights, L h＝0 represents the length of the transmission line at the same suspended point, σ0 represents the horizontal tension of the transmission line, and γ represents the specific load on the transmission line.

[0024] Optionally, the maximum sag on the transmission line between two adjacent towers is:

[0025]

[0026] Among them,

[0027] Optionally, the stress function is:

[0028]

[0029] Among them, σ0 represents the horizontal tension of the transmission line, γ represents the load ratio on the transmission line, l is the horizontal distance between two adjacent towers, L h＝0 Represents the length of the line at a high point such as a transmission line.

[0030] Optionally, the maximum stress on the transmission line between two adjacent towers is:

[0031]

[0032] The location of the maximum stress is the connection point between the higher side tower and the transmission line, that is, let x=l.

[0033] In a second aspect, the present invention further provides a transmission line status monitoring device, wherein a plurality of optical fibers are laid along the extension direction of the transmission line, and a fiber Bragg grating sensor is provided in the optical fiber at the connection between the transmission line and the tower, the device comprising:

[0034] a wavelength determination module, configured to obtain the laser data signal reflected by each fiber Bragg grating sensor uploaded by the laser receiver, and determine the wavelength of the laser reflected by the fiber Bragg grating sensor based on the laser data signal;

[0035] A stretch deformation calculation module, configured to calculate the stretch deformation in the length direction of the transmission line between two adjacent towers caused by sag based on the wavelength of the laser reflected by each fiber grating sensor;

[0036] A sag function construction module is used to construct a rectangular coordinate system with the connection point between the lower tower of two adjacent towers and the transmission line as the origin, the horizontal direction along the transmission line as the X-axis, and the vertical direction as the Y-axis, and to construct a sag function that reflects the relationship between the sag of any point on the transmission line between the two adjacent towers and the X-axis coordinate of the point;

[0037] A maximum sag calculation module is used to calculate the maximum value of the sag function to obtain the maximum sag on the transmission line between two adjacent towers;

[0038] a stress function construction module, configured to treat the transmission line between two adjacent towers as equivalent to a catenary model and, based on the rectangular coordinate system, to construct a stress function reflecting the relationship between the stress of any point on the transmission line between the two adjacent towers and the X-axis coordinate of the point;

[0039] The maximum stress calculation module is used to calculate the maximum value of the stress function to obtain the maximum stress on the transmission line between two adjacent towers.

[0040] In a third aspect, the present invention further provides an electronic device, comprising:

[0041] one or more processors;

[0042] a storage device for storing one or more programs;

[0043] When the one or more programs are executed by the one or more processors, the one or more processors implement the power transmission line status monitoring method provided in the first aspect of the present invention.

[0044] In a fourth aspect, the present invention further provides a computer-readable storage medium having a computer program stored thereon, wherein the program, when executed by a processor, implements the transmission line status monitoring method provided in the first aspect of the present invention.

[0045] The present invention provides a method for monitoring the state of a power transmission line. A plurality of optical fibers are laid along the extension direction of the power transmission line. A fiber grating sensor is provided in the optical fiber at the connection between the power transmission line and the tower. The laser data signal reflected by each fiber grating sensor uploaded by the laser receiver is obtained, and the wavelength of the laser reflected by the fiber grating sensor is determined based on the laser data signal. The expansion and contraction deformation of the length direction of the power transmission line caused by sag between two adjacent towers is calculated based on the wavelength of the laser reflected by each fiber grating sensor. The connection between the lower tower of the two adjacent towers and the power transmission line is taken as the origin, and the water level along the power transmission line is calculated. A rectangular coordinate system is constructed with the X-axis as the horizontal direction and the Y-axis as the vertical direction. A sag function is constructed to reflect the relationship between the sag of any point on the transmission line between two adjacent towers and the X-axis coordinate of that point. The maximum value of the sag function is calculated to obtain the maximum sag of the transmission line between the two adjacent towers. The transmission line between the two adjacent towers is then treated as a catenary model. Based on the rectangular coordinate system, a stress function is constructed to reflect the relationship between the stress of any point on the transmission line between the two adjacent towers and the X-axis coordinate of that point. The maximum value of the stress function is calculated to obtain the maximum stress of the transmission line between the two adjacent towers. The present invention uses multiple fiber grating sensors to monitor the sag, stress, and line length of the transmission line in real time. The monitoring is highly accurate and efficient, significantly reducing maintenance costs and the risk of power outages caused by sudden failures, thereby improving the stability and reliability of the entire power grid.

[0046] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0048] Figure 1 A flow chart of a method for monitoring the state of a power transmission line provided by an embodiment of the present invention;

[0049] Figure 2 A schematic diagram of the optical fiber distribution inside a transmission line provided by an embodiment of the present invention;

[0050] Figure 3 Schematic diagram of a model of a power transmission line between two adjacent towers in an embodiment of the present invention;

[0051] Figure 4A schematic structural diagram of a power transmission line status monitoring device provided by an embodiment of the present invention;

[0052] Figure 5 A schematic structural diagram of an electronic device provided by an embodiment of the present invention.

[0053] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0054] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0055] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0056] Figure 1 This is a flow chart of a method for monitoring the state of a power transmission line provided by an embodiment of the present invention. This embodiment is applicable to real-time monitoring of power transmission lines. The method can be executed by a transmission line state monitoring device provided by an embodiment of the present invention. The device can be implemented by software and / or hardware and is usually configured in an electronic device, such as Figure 1 As shown, the transmission line status monitoring method includes the following steps:

[0057] S101 , obtaining laser data signals reflected by each fiber Bragg grating sensor uploaded by a laser receiver, and determining the wavelength of the laser reflected by the fiber Bragg grating sensor based on the laser data signals.

[0058] In an embodiment of the present invention, a transmission line is erected on an outdoor tower, and the transmission line is supported by a plurality of towers arranged at intervals. The transmission line is affected by factors such as its own weight, wind force, and deformation caused by changes in ambient temperature. The combined effect of these external factors may cause changes in the physical state of the transmission line, such as sag, stress, and line length. Among them, the sag and line length changes caused by the line dancing caused by wind load have the greatest impact on the safety of the transmission line. The material of the transmission line is usually steel-core aluminum stranded wire, the length of which is much larger than the cross-sectional diameter, and the load it bears is mainly a uniformly distributed load. From a mechanical point of view, the transmission line can be approximately regarded as a catenary model that bears a uniformly distributed load. In order to be close to actual engineering, this embodiment considers that the towers on both sides of the transmission line are of unequal height.

[0059] During the construction phase of the transmission line, the optical fiber is laid inside the transmission line. For example, multiple optical fibers are laid along the extension direction of the transmission line, and a fiber grating sensor is provided in the optical fiber at the connection between the transmission line and the tower. The reason for laying it inside the transmission line in this embodiment is to protect the detection equipment and prevent the environment outside the transmission line from affecting the monitoring data. In other embodiments, it can also be laid outside the transmission line. The embodiment of the present invention is not limited again. The fiber grating sensor (Fiber Grating Sensor) is a type of fiber optic sensor. The sensing process based on fiber grating is to obtain sensing information by modulating the Bragg wavelength of the optical fiber by external physical parameters. It is a wavelength-modulated fiber optic sensor. The fiber grating sensor can realize direct measurement of physical quantities such as temperature and strain. Specifically, the fiber grating sensor has an initial reflection wavelength. When the light wave passes through the fiber grating, it will reflect back a narrowband light of a specific wavelength. The wavelength of the narrowband light depends on the grating pitch (grating period) of the fiber grating. When the grating period of a fiber Bragg grating sensor changes due to temperature or strain, the wavelength response of the reflected light wave also changes. Therefore, there is a corresponding relationship between the wavelength λ of the light reflected by the fiber Bragg grating sensor and physical quantities such as temperature, force, and length. This is the basic principle of fiber Bragg grating sensing technology.

[0060] Figure 2 Schematic diagram of the internal optical fiber distribution of the transmission line provided by the embodiment of the present invention, such as Figure 2 As shown, three optical fibers A, B, and C are laid along the extension direction of the transmission line. Each optical fiber is provided with a fiber Bragg grating sensor at the connection between the transmission line and the tower, namely the first fiber Bragg grating sensor, the second fiber Bragg grating sensor, and the third fiber Bragg grating sensor. The first fiber Bragg grating sensor is used to measure the sag change of the transmission line, the second fiber Bragg grating sensor is used to measure the line length change caused by thermal expansion and contraction of the transmission line due to changes in ambient temperature, and the third fiber Bragg grating sensor is sensitive to temperature but insensitive to strain and is used for temperature compensation.

[0061] Laser transmitters and receivers are installed at both ends of the transmission line. To address the uniquely challenging environment of transmission lines and their high demands for stable, long-term operation, this invention employs a power supply solution centered around high-capacity deep-cycle lead-acid batteries, supplemented by solar panels and wind turbines, to form a diversified primary power system. This solution is designed to provide a long-lasting and stable energy supply path for the laser diodes and other light source equipment in the laser transmitters. Given the excellent energy storage performance and stability of deep-cycle lead-acid batteries in harsh environments, they ensure that the laser diodes (such as the HL6545MG, which consumes approximately 0.36W) can continue to operate even in extreme weather conditions. To further enhance system reliability and independence, this system incorporates an automatic low-battery alarm mechanism for scenarios where solar or wind power generation is insufficient to maintain power. Once the battery charge drops below a predetermined threshold, the alarm system automatically activates, notifying the operations and maintenance team to take immediate action. Considering the economical power consumption of laser diodes and the ample capacity of lead-acid batteries (12V 100Ah), a single-terminal power system could theoretically support continuous operation of the light source equipment for up to 139 days. The strategy of deploying a dual-terminal power supply on the tower effectively addresses extreme or unforeseen conditions, ensuring the continuity and integrity of the transmission line monitoring system.

[0062] The laser receiver can convert the received optical signal into an electrical signal (ie, a laser data signal) and upload it to the host computer. The host computer determines the wavelength of the laser reflected by the fiber grating sensor based on the laser data signal of each fiber grating sensor.

[0063] S102: Calculate the expansion and contraction deformation in the length direction of the power transmission line between two adjacent towers due to sag based on the wavelength of the laser reflected by each fiber grating sensor.

[0064] In an embodiment of the present invention, the longitudinal expansion and contraction deformation of a transmission line between two adjacent towers due to sag is calculated based on the wavelength of laser light reflected by each fiber Bragg grating sensor. For example, the wavelength of the laser light reflected by the third fiber Bragg grating sensor and the wavelength of the laser light reflected by the second fiber Bragg grating sensor are subtracted from the wavelength of the laser light reflected by the first fiber Bragg grating sensor to obtain a third wavelength. This wavelength offsets the effects of temperature and temperature-induced deformation on the laser light reflected by the first fiber Bragg grating sensor. The longitudinal expansion and contraction deformation due to sag of the transmission line is then calculated based on the third wavelength and the intrinsic properties of the first fiber Bragg grating sensor.

[0065] For example, the calculation process of the expansion and contraction deformation of the transmission line in the longitudinal direction caused by sag between two adjacent towers is as follows:

[0066] 1. The wavelength of the laser signal reflected by the third fiber grating sensor is used as the first wavelength of the reflected light caused by the change in ambient temperature.

[0067] In some embodiments of the present invention, the wavelength λ of the laser signal reflected by the third fiber Bragg grating sensor is 3ij As the first wavelength Λ of the reflected light caused by the change in ambient temperature Tij .

[0068] 2. Calculate the difference between the wavelength of the laser signal reflected by the second fiber grating sensor and the first wavelength to obtain a second wavelength of the reflected light representing the expansion and contraction of the transmission line due to changes in ambient temperature.

[0069] In some embodiments of the present invention, in order to eliminate the influence of temperature factors on the monitoring results, the wavelength λ of the laser signal reflected by the second fiber Bragg grating sensor is calculated. 2ij With the first wavelength Λ Tij The difference between the values ​​of the wavelength and the wavelength of the reflected light caused by the expansion and contraction of the transmission line due to the change of ambient temperature is obtained. Lij .

[0070] 3. Calculate the difference between the wavelength of the laser signal reflected by the first fiber grating sensor and the second wavelength to obtain a third wavelength representing the reflected light caused by the sag of the transmission line.

[0071] In some embodiments of the present invention, in order to offset the influence of temperature-induced deformation on the laser signal reflected by the first fiber Bragg grating sensor, the wavelength λ of the laser signal reflected by the first fiber Bragg grating sensor is calculated. 1ij With the second wavelength Λ Lij The difference between the values ​​of Λ and Λ represents the third wavelength of the reflected light caused by the sag of the transmission line. fij .

[0072] 4. Calculate the expansion and contraction deformation in the length direction caused by the sag of the transmission line based on the third wavelength and the intrinsic properties of the first fiber grating sensor.

[0073] In the embodiment of the present invention, the expansion and contraction deformation in the longitudinal direction caused by the sag of the transmission line is calculated based on the third wavelength and the intrinsic properties of the first fiber Bragg grating sensor. The calculation formula is as follows:

[0074]

[0075] Among them, Λ fij is the third wavelength, λ 1Bij The initial reflection wavelength of the first fiber Bragg grating sensor at the jth tower, p e is the photoelastic coefficient.

[0076] S103. A rectangular coordinate system is constructed with the connection point between the lower tower of the two adjacent towers and the transmission line as the origin, the horizontal direction along the transmission line as the X-axis, and the vertical direction as the Y-axis. A sag function is constructed that reflects the relationship between the sag of any point on the transmission line between the two adjacent towers and the X-axis coordinate of the point.

[0077] Figure 3 FIG. 1 is a schematic diagram of a model of a power transmission line between two adjacent towers in an embodiment of the present invention. Figure 3 As shown, in this embodiment of the present invention, a rectangular coordinate system is constructed with the connection point between the lower tower of two adjacent towers and the transmission line as the origin, the horizontal direction along the transmission line as the X-axis, and the vertical direction as the Y-axis. A sag function is constructed to reflect the relationship between the sag of any point on the transmission line between the two adjacent towers and the X-axis coordinate of the point. The sag function is as follows:

[0078]

[0079] Where x represents the horizontal coordinate of the point on the transmission line in the rectangular coordinate system, l is the horizontal distance between two adjacent towers, h is the height difference between towers of different heights, L h＝0 represents the length of the transmission line at the same suspended point, σ0 represents the horizontal tension of the transmission line, and γ represents the specific load on the transmission line.

[0080] Among them, the specific load γ can be calculated by the following formula:

[0081]

[0082] Where a represents the horizontal coordinate value of the lowest point of the transmission line between two adjacent towers.

[0083] S104. Calculate the maximum value of the sag function to obtain the maximum sag on the transmission line between two adjacent towers.

[0084] like Figure 3 As shown, in the embodiment of the present invention, The sag at the position (i.e., the central sag) is taken as the maximum sag on the transmission line between two adjacent towers. That is, the maximum sag on the transmission line between two adjacent towers is:

[0085]

[0086] It should be noted that if Figure 3 As shown, the central sag of the overhead line with unequal height suspension points is not the maximum sag of the line. However, in order to simplify the calculation of the data processing unit, the central sag is used here to approximate the maximum sag. According to actual engineering experience, the error of doing so is less than 5%.

[0087] S105. The transmission line between two adjacent towers is equivalent to a catenary model. Based on a rectangular coordinate system, a stress function is constructed to reflect the relationship between the stress of any point on the transmission line between the two adjacent towers and the X-axis coordinate of the point.

[0088] like Figure 3 As shown, in an embodiment of the present invention, the transmission line between two adjacent towers is equivalent to a catenary model. Based on a rectangular coordinate system, a stress function is constructed to reflect the relationship between the stress of any point on the transmission line between the two adjacent towers and the X-axis coordinate of the point. The stress function is as follows:

[0089]

[0090] Among them, σ0 represents the horizontal tension of the transmission line, γ represents the load ratio on the transmission line, l is the horizontal distance between two adjacent towers, L h＝0 Represents the length of the line at a high point such as a transmission line.

[0091] S106. Calculate the maximum value of the stress function to obtain the maximum stress on the transmission line between two adjacent towers.

[0092] In the embodiment of the present invention, the maximum stress position of the unequal height suspension point overhead line is the connection point between the higher side tower and the transmission line, that is, x=l. The maximum stress on the transmission line between two adjacent towers is:

[0093]

[0094] In the embodiment of the present invention, after calculating the expansion and contraction deformation V in the length direction of the transmission line caused by sag between two adjacent towers, the maximum sag f on the transmission line between two adjacent towers, and the maximum stress σ on the transmission line between two adjacent towers, the calculated expansion and contraction deformation V can be compared with the pre-set safety threshold value V of the expansion and contraction deformation. max Compare the calculated maximum sag f with the preset sag safety threshold f max Compare and compare the calculated maximum stress σ with the preset stress safety threshold σ max When the calculated expansion and contraction deformation V is greater than the preset expansion and contraction deformation safety threshold V max , or the calculated maximum sag f is greater than the preset sag safety threshold f max , or the calculated maximum stress σ is greater than the preset stress safety threshold σ max When a warning signal is sent to the user terminal.

[0095] In an embodiment of the present invention, in order to consider both the absolute value and the rate of change of the monitored parameters in a real-time monitoring system, the present invention introduces two sets of safety thresholds: one for the absolute value of the parameter and the other for the rate of change of the parameter. In this way, the system can warn of both immediate dangerous conditions and potential risks that may be foreshadowed by rapid changes. Define the absolute safety threshold: V max 、f max , σ max ; Safety threshold of change speed: Since the laser transmitter is emitting light signals at all times, the expansion and contraction deformation, maximum sag, and maximum stress we obtain are a time series, and the interval Δt depends on the sampling frequency of the receiver. Then, based on the expansion and contraction deformation sequence of the transmission line caused by sag, the deformation speed of the expansion and contraction deformation is monitored. Monitoring the maximum sag change speed based on the maximum sag sequence Monitoring the maximum stress change rate based on the maximum stress sequence Determine whether the expansion deformation is greater than the preset expansion deformation safety threshold V max , whether the maximum sag is greater than the preset sag safety threshold f max , whether the maximum stress is greater than the stress safety threshold σ max , deformation speed of expansion and contraction deformation Is it greater than the safety threshold? Maximum sag change speed Is it greater than the safety threshold? Maximum stress change rate Is it greater than the safety threshold? As long as any one of them exceeds the threshold, a warning signal will be sent to the user terminal.

[0096] For example, in an embodiment of the present invention, the monitoring results and alarm signals can also be transmitted to the unit's internal server through an intranet switch via an encryption algorithm (such as AES128). At the same time, they will be transmitted to the alarm room and office in the substation through the switch. In this way, the staff in the substation can receive the alarm signal as soon as possible and take effective measures in a timely manner. In addition, the monitoring results and alarm signals can also be archived for easy subsequent tracing. The transformer foundation status information data in the memory is read in the internal office system to display real-time data and historical trends, as well as any alarms or abnormal conditions. Based on the monitoring data, maintenance personnel can evaluate the condition of the substation transformer foundation and take maintenance or reinforcement measures when necessary. Through this process, the fiber optic sensor system can provide continuous and real-time monitoring of the substation transformer foundation to ensure its stability and safety. The advantages of this monitoring technology are its high sensitivity, strong anti-electromagnetic interference ability, and reliability suitable for harsh environmental conditions.

[0097] The transmission line status monitoring method provided by the embodiment of the present invention comprises the following steps: a plurality of optical fibers are laid along the extension direction of the transmission line; a fiber Bragg grating sensor is provided in the optical fiber at the connection between the transmission line and the tower; a laser data signal reflected by each fiber Bragg grating sensor uploaded by a laser receiver is obtained; the wavelength of the laser reflected by the fiber Bragg grating sensor is determined based on the laser data signal; the expansion and contraction deformation of the transmission line in the length direction caused by sag between two adjacent towers is calculated based on the wavelength of the laser reflected by each fiber Bragg grating sensor; and the expansion and contraction deformation of the transmission line in the length direction caused by sag between two adjacent towers is calculated with the connection between the lower tower of the two adjacent towers and the transmission line as the origin. A rectangular coordinate system is constructed with the horizontal direction as the X-axis and the vertical direction as the Y-axis. A sag function is constructed to reflect the relationship between the sag of any point on the transmission line between two adjacent towers and the X-axis coordinate of that point. The maximum value of the sag function is calculated to obtain the maximum sag on the transmission line between the two adjacent towers. The transmission line between the two adjacent towers is equivalent to a catenary model. Based on the rectangular coordinate system, a stress function is constructed to reflect the relationship between the stress of any point on the transmission line between the two adjacent towers and the X-axis coordinate of that point. The maximum value of the stress function is calculated to obtain the maximum stress on the transmission line between the two adjacent towers. The present invention uses multiple fiber grating sensors to monitor the sag, stress, and line length of the transmission line in real time. The monitoring accuracy and efficiency are high, which can significantly reduce the maintenance costs and power outage risks caused by sudden failures, thereby improving the stability and reliability of the entire power grid.

[0098] The present invention also provides a transmission line status monitoring device, wherein a plurality of optical fibers are laid along the extension direction of the transmission line, and a fiber grating sensor is provided in the optical fiber at the connection between the transmission line and the tower. Figure 4 A schematic diagram of a transmission line status monitoring device provided by an embodiment of the present invention is shown in FIG. Figure 4 As shown, the transmission line status monitoring device includes:

[0099] The wavelength determination module 201 is configured to obtain the laser data signal reflected by each fiber Bragg grating sensor uploaded by the laser receiver, and determine the wavelength of the laser reflected by the fiber Bragg grating sensor based on the laser data signal;

[0100] The expansion and contraction deformation calculation module 202 is configured to calculate the expansion and contraction deformation of the transmission line between two adjacent towers due to sag based on the wavelength of the laser light reflected by each fiber grating sensor;

[0101] The sag function construction module 203 is configured to construct a rectangular coordinate system with the connection point between the lower tower of two adjacent towers and the transmission line as the origin, the horizontal direction along the transmission line as the X-axis, and the vertical direction as the Y-axis, and to construct a sag function that reflects the relationship between the sag of any point on the transmission line between the two adjacent towers and the X-axis coordinate of the point;

[0102] A maximum sag calculation module 204 is configured to calculate the maximum value of the sag function to obtain the maximum sag on the transmission line between two adjacent towers;

[0103] A stress function construction module 205 is configured to treat the transmission line between two adjacent towers as equivalent to a catenary model and construct a stress function based on the rectangular coordinate system to reflect the relationship between the stress of any point on the transmission line between the two adjacent towers and the X-axis coordinate of the point;

[0104] The maximum stress calculation module 206 is used to calculate the maximum value of the stress function to obtain the maximum stress on the transmission line between two adjacent towers.

[0105] In some embodiments of the present invention, three optical fibers are laid along the extension direction of the transmission line, and each optical fiber is provided with a fiber Bragg grating sensor at the connection between the transmission line and the tower, namely a first fiber Bragg grating sensor, a second fiber Bragg grating sensor and a third fiber Bragg grating sensor. Among them, the first fiber Bragg grating sensor is used to measure the sag change of the transmission line, the second fiber Bragg grating sensor is used to measure the line length change caused by thermal expansion and contraction of the transmission line due to changes in ambient temperature, and the third fiber Bragg grating sensor is sensitive to temperature but insensitive to strain, and is used for temperature compensation.

[0106] In some embodiments of the present invention, the expansion and contraction deformation calculation module 202 includes:

[0107] a first wavelength determining submodule, configured to use the wavelength of the laser signal reflected by the third fiber grating sensor as the first wavelength of the reflected light caused by the change in ambient temperature;

[0108] a second wavelength calculation submodule, configured to calculate a difference between a wavelength of the laser signal reflected by the second fiber Bragg grating sensor and the first wavelength, to obtain a second wavelength representing reflected light caused by expansion and contraction of the transmission line due to changes in ambient temperature;

[0109] a third wavelength calculation submodule, configured to calculate a difference between a wavelength of the laser signal reflected by the first fiber Bragg grating sensor and the second wavelength, to obtain a third wavelength representing reflected light caused by transmission line sag;

[0110] The expansion and contraction deformation calculation submodule is used to calculate the expansion and contraction deformation in the length direction caused by the sag of the transmission line based on the third wavelength and the intrinsic properties of the first fiber grating sensor.

[0111] In some embodiments of the present invention, the expansion and contraction deformation in the longitudinal direction caused by the sag of the transmission line is calculated based on the third wavelength and the intrinsic properties of the first fiber Bragg grating sensor, and the calculation formula is as follows:

[0112]

[0113] Among them, Λ fij is the third wavelength, λ 1Bij The initial reflection wavelength of the first fiber Bragg grating sensor at the jth tower, p e is the photoelastic coefficient.

[0114] In some embodiments of the present invention, the sag function is:

[0115]

[0116] Where x represents the horizontal coordinate of the point on the transmission line in the rectangular coordinate system, l is the horizontal distance between two adjacent towers, h is the height difference between towers of different heights, L h＝0 represents the length of the transmission line at the same suspended point, σ0 represents the horizontal tension of the transmission line, and γ represents the specific load on the transmission line.

[0117] In some embodiments of the present invention, the maximum sag on the transmission line between two adjacent towers is:

[0118]

[0119] Among them,

[0120] Optionally, the stress function is:

[0121]

[0122] Among them, σ0 represents the horizontal tension of the transmission line, γ represents the load ratio on the transmission line, l is the horizontal distance between two adjacent towers, L h＝0 Represents the length of the line at a high point such as a transmission line.

[0123] In some embodiments of the present invention, the maximum stress on the transmission line between two adjacent towers is:

[0124]

[0125] The location of the maximum stress is the connection point between the higher side tower and the transmission line, that is, let x=l.

[0126] The above-mentioned power transmission line state monitoring device can execute the power transmission line state monitoring method provided by the above-mentioned embodiment of the present invention, and has the corresponding functional modules and beneficial effects for executing the power transmission line state monitoring method.

[0127] Figure 5A schematic diagram of the structure of an electronic device provided for an embodiment of the present invention. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device may also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or required herein.

[0128] like Figure 5 As shown, the electronic device includes at least one processor 11 and a memory, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., which is communicatively connected to the at least one processor 11. The memory stores a computer program that can be executed by the at least one processor, and the processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 into the random access memory (RAM) 13. Various programs and data required for the operation of the electronic device can also be stored in the RAM 13. The processor 11, ROM 12, and RAM 13 are connected to each other via a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0129] Multiple components in the electronic device are connected to the I / O interface 15, including an input unit 16, such as a keyboard, mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a magnetic disk, optical disk, etc.; and a communication unit 19, such as a network card, modem, wireless communication transceiver, etc. The communication unit 19 allows the electronic device to exchange information / data with other devices via a computer network such as the Internet and / or various telecommunication networks.

[0130] The processor 11 can be any general-purpose and / or specialized processing component with processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various specialized artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. The processor 11 executes the various methods and processes described above, such as the power transmission line condition monitoring method.

[0131] In some embodiments, the power transmission line condition monitoring method can be implemented as a computer program tangibly embodied in a computer-readable storage medium, such as storage unit 18. In some embodiments, part or all of the computer program can be loaded and / or installed on the electronic device via ROM 12 and / or communication unit 19. When the computer program is loaded into RAM 13 and executed by processor 11, one or more steps of the power transmission line condition monitoring method described above can be performed. Alternatively, in other embodiments, processor 11 can be configured to execute the power transmission line condition monitoring method in any other suitable manner (e.g., via firmware).

[0132] Various embodiments of the systems and techniques described herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), system-on-chip systems (SOCs), programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments can include being implemented in one or more computer programs that are executable and / or interpreted on a programmable system that includes at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0133] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when the computer program is executed by the processor, the functions / operations specified in the flowcharts and / or block diagrams are implemented. The computer program may be executed entirely on the machine, partially on the machine, as a stand-alone software package, partially on the machine and partially on a remote machine, or entirely on a remote machine or server.

[0134] In the context of the present invention, computer-readable storage media can be tangible media that can contain or store a computer program for use with an instruction execution system, device or equipment or used in combination with an instruction execution system, device or equipment. Computer-readable storage media can include but are not limited to electronic, magnetic, optical, electromagnetic, infrared or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, computer-readable storage media can be machine-readable signal media. More specific examples of machine-readable storage media can include electrical connections based on one or more lines, portable computer disks, hard disks, random access memories (RAM), read-only memories (ROM), erasable programmable read-only memories (EPROM or flash memory), optical fibers, portable compact disk read-only memories (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0135] To provide interaction with a user, the systems and techniques described herein can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user can provide input to the electronic device. Other types of devices can also be used to provide interaction with the user; for example, the feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including acoustic input, voice input, or tactile input).

[0136] The systems and techniques described herein can be implemented in a computing system that includes back-end components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes front-end components (e.g., a user computer with a graphical user interface or web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such back-end components, middleware components, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0137] A computing system may include clients and servers. The clients and servers are typically remote from each other and typically interact via a communication network. This client-server relationship arises through computer programs running on the respective computers, creating a client-server relationship. The server may be a cloud server, also known as a cloud computing server or cloud host. This server is a hosting product within the cloud computing service ecosystem that addresses the management difficulties and limited scalability of traditional physical hosting and VPS services.

[0138] An embodiment of the present invention further provides a computer program product, including a computer program, which, when executed by a processor, implements the transmission line status monitoring method provided in any embodiment of the present application.

[0139] The computer program product may be implemented by writing computer program code for performing the operations of the present invention in one or more programming languages, or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer via any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0140] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved. This is not limited herein.

[0141] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A method for monitoring the state of a transmission line, characterized in that: A plurality of optical fibers are laid along the extension direction of the transmission line, and a fiber grating sensor is set in the optical fiber at the connection between the transmission line and the tower. The method includes: Acquire the laser data signal reflected by each fiber Bragg grating sensor uploaded by the laser receiver, and determine the wavelength of the laser reflected by the fiber Bragg grating sensor based on the laser data signal; The expansion and contraction deformation of the transmission line in the longitudinal direction caused by sag between two adjacent towers is calculated based on the wavelength of the laser reflected by each fiber Bragg grating sensor; A rectangular coordinate system is constructed with the connection point between the lower tower and the transmission line as the origin, the horizontal direction along the transmission line as the X-axis, and the vertical direction as the Y-axis. A sag function is constructed to reflect the relationship between the sag of any point on the transmission line between the two adjacent towers and the X-axis coordinate of the point. Calculating the maximum value of the sag function to obtain the maximum sag on the transmission line between two adjacent towers; The transmission line between two adjacent towers is equivalent to a catenary model, and based on the rectangular coordinate system, a stress function is constructed to reflect the relationship between the stress of any point on the transmission line between the two adjacent towers and the X-axis coordinate of the point; Calculating the maximum value of the stress function to obtain the maximum stress on the transmission line between two adjacent towers; Three optical fibers are laid along the extension direction of the transmission line. Each optical fiber is equipped with a fiber Bragg grating sensor at the connection between the transmission line and the tower. These sensors are the first fiber Bragg grating sensor, the second fiber Bragg grating sensor, and the third fiber Bragg grating sensor. The first fiber Bragg grating sensor is used to measure the sag change of the transmission line. The second fiber Bragg grating sensor is used to measure the change in line length caused by thermal expansion and contraction of the transmission line due to changes in ambient temperature. The third fiber Bragg grating sensor is sensitive to temperature but not strain and is used for temperature compensation. The expansion and contraction deformation of the transmission line in the longitudinal direction caused by sag between two adjacent towers is calculated based on the wavelength of the laser reflected by each fiber Bragg grating sensor, including: using the wavelength of the laser signal reflected by the third fiber grating sensor as the first wavelength of the reflected light caused by the change in ambient temperature; Calculating the difference between the wavelength of the laser signal reflected by the second fiber grating sensor and the first wavelength to obtain a second wavelength representing the reflected light caused by the expansion and contraction of the transmission line due to the change in ambient temperature; Calculating a difference between a wavelength of the laser signal reflected by the first fiber grating sensor and the second wavelength to obtain a third wavelength representing reflected light caused by transmission line sag; Calculating the expansion and contraction deformation in the longitudinal direction of the transmission line caused by sag based on the third wavelength and the intrinsic properties of the first fiber grating sensor; The sag function is: in, It represents the horizontal coordinate of the point on the transmission line in the rectangular coordinate system, is the horizontal distance between two adjacent towers, is the height difference of towers of different heights, Represents the length of the transmission line at the elevated point, represents the horizontal tension of the transmission line, Represents the specific load on the transmission line; The maximum sag on the transmission line between two adjacent towers is: Among them, ; The stress function is: in, represents the horizontal tension of the transmission line, represents the load ratio on the transmission line, is the horizontal distance between two adjacent towers, Represents the length of the line at a high point such as a transmission line.

2. The method for monitoring the state of a transmission line according to claim 1, wherein: The expansion and contraction deformation in the longitudinal direction caused by the sag of the transmission line is calculated based on the third wavelength and the intrinsic properties of the first fiber grating sensor. The calculation formula is as follows: in, is the third wavelength, The initial reflection wavelength of the first fiber Bragg grating sensor at the jth tower, is the photoelastic coefficient.

3. The method for monitoring the state of a power transmission line according to claim 1, wherein: The maximum stress on the transmission line between two adjacent towers is: Among them, the location of the maximum stress is the connection point between the higher side tower and the transmission line, that is, .

4. An electronic device, characterized in that: include: one or more processors; a storage device for storing one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the transmission line status monitoring method according to any one of claims 1 to 3.

5. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the transmission line status monitoring method according to any one of claims 1 to 3 is implemented.

Images