A system and method for monitoring displacement of a footing of a power transmission tower

Abstract

The application discloses a column foot displacement monitoring system and method of a power transmission tower, and relates to the technical field of power transmission line safety monitoring. The system comprises an A fixed pulley installed on an A column foot and a B fixed pulley installed on a B column foot, an alpha sensor and a beta sensor installed on a C column foot, a gamma sensor and a delta sensor installed on a D column foot, an alpha measuring line connected to the alpha sensor after passing through the B fixed pulley and the A fixed pulley in sequence from a fixed point, a beta measuring line directly connected to the beta sensor from the fixed point, a gamma measuring line directly connected to the gamma sensor from the fixed point, and a delta measuring line connected to the delta sensor after passing through the A fixed pulley and the B fixed pulley in sequence from the fixed point. A processor takes displacement data measured by the four relative displacement sensors as length change amounts of the corresponding measuring lines, determines whether displacement of the power transmission tower occurs according to the length change amounts of the four measuring lines, improves the accuracy of column foot displacement monitoring, and reduces the hardware cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power transmission line safety monitoring, in particular to a column foot displacement monitoring system and method for a power transmission tower. BACKGROUND

[0002] Surface displacement monitoring is a key technical means to ensure the safe and stable operation of large infrastructure such as power transmission lines, bridges, buildings, etc. As the core support structure of high-voltage power transmission networks, the stability of the foundation of the power transmission tower is directly related to the safety of the entire power grid. Uneven deformation, sliding or settlement of the ground may cause the tower to tilt, the foundation to crack, and even catastrophic accidents such as tower collapse and line rupture. Therefore, it is of great engineering significance to continuously and accurately monitor the displacement of the tower column foot and to achieve early warning of potential risks.

[0003] Currently, traditional displacement monitoring methods mainly rely on single-point displacement meters or global positioning systems (GPS). Single-point displacement meters can usually only measure the relative displacement of a single point, with extremely limited monitoring range, and cannot fully reflect the overall deformation trend of multiple foundation points of the tower. Although GPS positioning technology can provide absolute coordinates, its accuracy is easily affected by environmental factors such as the atmosphere and multipath effects, and its reliability decreases in complex terrain or bad weather, and the equipment cost and operation and maintenance cost are high.

[0004] When the four column feet of the power transmission tower simultaneously and uniformly slide as a whole (e.g., located on a whole landslide), neither the single-point displacement meter nor the GPS (whose accuracy is not sufficient to perceive small-scale overall movement) can effectively detect the small relative displacement between the column feet. However, the relative displacement during this overall sliding process is exactly the most important indicator for judging whether the structure is under balanced stress and whether the foundation has undergone torsional deformation. SUMMARY

[0005] The technical problem to be solved by the present application is that the column foot displacement monitoring of the existing power transmission tower has the problems of limited monitoring range, susceptibility to environmental interference, difficulty in reflecting overall deformation trend, and difficulty in monitoring relative displacement in the case of overall sliding, and the purpose is to provide a column foot displacement monitoring system and method for a power transmission tower, which solves the above problems.

[0006] The present application is achieved by the following technical solutions:

[0007] In a first aspect, the present application provides a column foot displacement monitoring system for a power transmission tower, applied to a power transmission tower comprising four column feet, including an A column foot, a B column foot, a C column foot and a D column foot; the system comprises:

[0008] a fixed point, arranged at the geometric center of the power transmission tower during installation;

[0009] two pulleys, including an A fixed pulley mounted on the A column foot and a B fixed pulley mounted on the B column foot;

[0010] four relative displacement sensors, including an A sensor and a B sensor mounted on the C column foot, and a C sensor and a D sensor mounted on the D column foot; the four relative displacement sensors are all zeroed when the power transmission tower is installed and debugged;

[0011] four measurement lines, including an A measurement line, a B measurement line, a C measurement line and a D measurement line; wherein the A measurement line is connected to the A sensor after passing through the B fixed pulley and the A fixed pulley in sequence from the fixed point; the B measurement line is directly connected to the B sensor from the fixed point; the C measurement line is directly connected to the C sensor from the fixed point; and the D measurement line is connected to the D sensor after passing through the A fixed pulley and the B fixed pulley in sequence from the fixed point;

[0012] a processor, which is in communication connection with the four relative displacement sensors respectively, and is configured to determine whether the power transmission tower has displacement according to length changes of the four measurement lines by taking displacement data measured by each relative displacement sensor as the length change of the corresponding measurement line.

[0013] Optionally, the processor is specifically configured to:

[0014] acquire a plurality of displacement data measured by each relative displacement sensor in a current period respectively;

[0015] calculate an average value of the plurality of displacement data corresponding to each relative displacement sensor;

[0016] take the average value as the length change of the corresponding measurement line.

[0017] Optionally, the processor is further configured to:

[0018] before calculating the average value of the plurality of displacement data corresponding to each relative displacement sensor, delete displacement data not meeting a preset effective value range from the plurality of displacement data.

[0019] Optionally, the processor is further configured to:

[0020] before taking the average value as the length change of the corresponding measurement line, determine that an absolute value of a difference between the average value and a historical average value is less than a preset change threshold; the historical average value is an average value calculated according to displacement data of a last period.

[0021] Optionally, the processor is specifically configured to:

[0022] If absolute values of the length variation amounts of the four measurement lines are all less than a preset variation amount, it is determined that the power transmission tower does not displace.

[0023] If the absolute value of the length variation amount of any one of the measurement lines is greater than or equal to the preset variation amount, it is determined that the power transmission tower displaces.

[0024] Optionally, the processor is further configured to:

[0025] After it is determined that the power transmission tower displaces if the length variation amount of any one of the measurement lines is not equal to zero, the length variation amounts of the four measurement lines are converted into a discrete feature vector; each element in the feature vector is used to represent a numerical size level of the length variation amount of the corresponding measurement line.

[0026] According to the feature vector and the length variation amounts of the four measurement lines, a pre-stored data table is queried to determine a column foot and a direction in which the power transmission tower displaces; the data table records column feet and displacement directions corresponding to different feature vectors and different length variation amounts.

[0027] Optionally, the processor is further configured to:

[0028] After the column foot and the direction in which the power transmission tower displaces are determined, different levels of early warning instructions are generated according to a number of column feet that displace and a maximum length variation amount in the length variation amounts of the four measurement lines.

[0029] Optionally, the processor is specifically configured to:

[0030] If a single column foot displaces and the maximum length variation amount reaches a first numerical range, a record data instruction is generated.

[0031] If a single column foot displaces and the maximum length variation amount reaches a second numerical range, or four column feet displace and the maximum length variation amount reaches a third numerical range, a tower end sound and light alarm instruction and a field review early warning instruction are generated; the second numerical range is greater than the first numerical range.

[0032] If a single column foot displaces and the maximum length variation amount reaches a fourth numerical range, or two column feet displace and the maximum length variation amount reaches a fifth numerical range, an emergency repair instruction and a linkage dispatch center instruction are generated; the fourth numerical range is greater than the second numerical range.

[0033] If four column feet displace and the maximum length variation amount reaches a sixth numerical range, an emergency repair instruction and a shutdown suggestion instruction are generated; the sixth numerical range is greater than the third numerical range.

[0034] In a second aspect, a method for monitoring displacement of a tower footing of a power transmission tower is provided, which is applied to a processor of the monitoring system for monitoring displacement of a tower footing of a power transmission tower as described in any of the first aspect, and the method comprises:

[0035] taking the displacement data measured by each relative displacement sensor as a length variation of the corresponding measurement line;

[0036] determining whether the power transmission tower has displacement according to the length variations of the four measurement lines.

[0037] Optionally, the taking the displacement data measured by each relative displacement sensor as a length variation of the corresponding measurement line comprises:

[0038] respectively acquiring a plurality of displacement data continuously measured by each relative displacement sensor in a current period;

[0039] calculating an average value of the plurality of displacement data corresponding to each relative displacement sensor;

[0040] taking the average value as the length variation of the corresponding measurement line.

[0041] Optionally, before the calculating an average value of the plurality of displacement data corresponding to each relative displacement sensor, the method further comprises:

[0042] deleting, from the plurality of displacement data, displacement data not satisfying a preset valid value range.

[0043] Optionally, before the taking the average value as the length variation of the corresponding measurement line, the method further comprises:

[0044] determining that an absolute value of a difference between the average value and a historical average value is less than a preset variation threshold; the historical average value is an average value calculated according to displacement data of a last period.

[0045] Optionally, the determining whether the power transmission tower has displacement according to the length variations of the four measurement lines comprises:

[0046] if absolute values of the length variations of the four measurement lines are all less than a preset variation, it is determined that the power transmission tower has no displacement;

[0047] if an absolute value of the length variation of any measurement line is greater than or equal to a preset variation, it is determined that the power transmission tower has displacement.

[0048] Optionally, after the determining that the power transmission tower has displacement, the method further comprises:

[0049] Convert the length variation of the four measuring lines into a discrete feature vector; each element in the feature vector is used to represent the numerical size level of the length variation of the corresponding measuring line;

[0050] According to the feature vector and the length variation of the four measuring lines, query the pre-stored data table to determine the column foot and direction of the displacement of the power transmission tower; the data table records the displacement column foot and displacement direction corresponding to different feature vectors and different length variations.

[0051] Optionally, after determining the column foot and displacement direction of the power transmission tower, the method further comprises:

[0052] According to the number of column feet that have been displaced and the maximum length variation in the length variation of the four measuring lines, generate different levels of early warning instructions.

[0053] Optionally, the generating of different levels of early warning instructions according to the number of column feet that have been displaced and the maximum length variation in the length variation of the four measuring lines comprises:

[0054] If a single column foot has been displaced and the maximum length variation reaches a first numerical range, a record data instruction is generated;

[0055] If a single column foot has been displaced and the maximum length variation reaches a second numerical range, or four column feet have been displaced and the maximum length variation reaches a third numerical range, a tower end sound and light alarm instruction and a field review early warning instruction are generated; the second numerical range is greater than the first numerical range;

[0056] If a single column foot has been displaced and the maximum length variation reaches a fourth numerical range, or two column feet have been displaced and the maximum length variation reaches a fifth numerical range, an emergency repair instruction and a linkage dispatch center instruction are generated; the fourth numerical range is greater than the second numerical range;

[0057] If four column feet have been displaced and the maximum length variation reaches a sixth numerical range, an emergency repair instruction and a shutdown suggestion instruction are generated; the sixth numerical range is greater than the third numerical range.

[0058] Compared with the prior art, the present application has the following advantages and beneficial effects:

[0059] 1、The column foot displacement monitoring system of the power transmission tower establishes an absolute displacement reference benchmark that is not affected by the displacement of the tower by setting a fixed point independent of the structure of the power transmission tower, which enables the system to not only sense the relative displacement between the column feet, but also effectively capture the translational slip of the overall power transmission tower (i.e., the four column feet are synchronized), overcoming the monitoring blind area of traditional relative measurement methods in the overall slip working condition and achieving more comprehensive monitoring of the foundation displacement.

[0060] 2、The column foot displacement monitoring system of the power transmission tower uses a clever mechanical sensor network layout, which uses only four relative displacement sensors and a simple pulley and rope mechanism to construct a monitoring network that can cover all degrees of freedom displacement of the four column feet in the plane. This scheme is simple in structure, low in cost, and easy to install, and by analyzing the length changes of the four measurement lines, the spatial displacement state of the tower foundation can be comprehensively sensed, achieving complex monitoring functions at extremely low hardware cost and having extremely high cost performance.

[0061] 3、The mechanical transmission structure (pulley and measurement line) used by the column foot displacement monitoring system of the power transmission tower is less affected by complex environmental factors such as lightning, rain and fog, electromagnetic interference, etc., has high reliability, and is very suitable for long-term stable operation in harsh environments along the power transmission line, ensuring the continuity and accuracy of the monitoring data. Through accurate monitoring of the column foot displacement, the uneven deformation trend of the foundation can be detected early before the tower tilts significantly or is macroscopically damaged, providing valuable early warning time for maintenance personnel. BRIEF DESCRIPTION OF DRAWINGS

[0062] In order to more clearly illustrate the technical solutions of the example embodiments of the present application, the following will briefly introduce the drawings needed to be used in the examples. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be considered as limiting the scope. For those skilled in the art, other related drawings can also be obtained without creative labor. In the drawings:

[0063] Figure 1 The column foot position diagram of the power transmission tower provided for the examples of the present application;

[0064] Figure 2 The structural diagram of the column foot displacement monitoring system of the power transmission tower provided for the examples of the present application;

[0065] Figure 3 The flowchart of the column foot displacement monitoring method of the power transmission tower provided for the examples of the present application.

[0066] Reference signs:

[0067] 0 - transmission tower; 1 - A column foot; 2 - B column foot; 3 - C column foot; 4 - D column foot; 5 - fixed pulley; 6 - alpha sensor; 7 - beta sensor; 8 - gamma sensor; 9 - delta sensor; 10 - fixed point. DETAILED DESCRIPTION

[0068] In order to make the objects, technical solutions and advantages of the present application clearer, further detailed description will be made to the present application with reference to the embodiments and drawings, the illustrative embodiments of the present application and the description thereof are only used to explain the present application, and do not limit the present application.

[0069] In order to solve the problems of limited monitoring range, easy environmental interference, difficult to reflect the overall deformation trend and difficult to monitor the relative displacement in the overall slip in the column foot displacement monitoring of the transmission tower in the prior art, the column foot displacement monitoring system of the transmission tower provided by the embodiments of the present application is applied to the transmission tower including four column feet.

[0070] Please refer to Figure 1 The column foot position diagram of the transmission tower provided by the embodiments of the present application is shown in the figure. In the figure, 0 represents the transmission tower, 1 represents the A column foot, 2 represents the B column foot, 3 represents the C column foot, and 4 represents the D column foot. The four column feet of the transmission tower are the A column foot, the B column foot, the C column foot and the D column foot, the A column foot is located at the upper left corner of the transmission tower, the B column foot is located at the upper right corner of the transmission tower, the C column foot is located at the lower left corner of the transmission tower, and the D column foot is located at the lower right corner of the transmission tower.

[0071] Please refer to Figure 2 The structure diagram of the column foot displacement monitoring system of the transmission tower provided by the embodiments of the present application is shown in the figure, in which 5 represents the fixed pulley, 6 represents the alpha sensor, 7 represents the beta sensor, 8 represents the gamma sensor, 9 represents the delta sensor, and 10 represents the fixed point. The column foot displacement monitoring system includes two pulleys, four relative displacement sensors, four measuring lines and a processor.

[0072] The two pulleys include an A fixed pulley installed on the A column foot and a B fixed pulley installed on the B column foot;

[0073] The four relative displacement sensors include the alpha sensor and the beta sensor installed on the C column foot, and the gamma sensor and the delta sensor installed on the D column foot;

[0074] The four measuring lines include an alpha measuring line, a beta measuring line, a gamma measuring line and a delta measuring line;

[0075] The alpha measuring line starts from the fixed point, passes through the B fixed pulley and the A fixed pulley in turn, and is connected to the alpha sensor;

[0076] The fixed point is located at the geometric center of the transmission tower during installation;

[0077] The B measuring line is directly connected to the B sensor from the fixed point;

[0078] The C measuring line is directly connected to the C sensor from the fixed point;

[0079] The D measuring line is connected to the D sensor after passing through the A fixed pulley and the B fixed pulley from the fixed point;

[0080] The processor is in communication connection with the four relative displacement sensors respectively, and is configured to take the displacement data measured by each relative displacement sensor as the length change of the corresponding measuring line, and determine whether the power transmission tower has displacement according to the length changes of the four measuring lines.

[0081] It should be noted that, Figure 2 The processor is not shown, and can be installed on or near the power transmission tower, or can be installed in a monitoring center and connected with the four relative displacement sensors through wired or wireless communication.

[0082] In a possible embodiment, the four relative displacement sensors are selected as the pull rope type relative displacement sensors with a range of 0-100 mm and an accuracy of ±0.1 mm. The four relative displacement sensors have completed the zero operation in the initial state without displacement after the installation of the power transmission tower.

[0083] Specifically, when the power transmission tower is installed, it is confirmed that the column foot has no displacement and the measuring line is tensioned (tension of 5-10 N), and the processor sends a zero instruction to the four relative displacement sensors, and sets the output at this time as the “0 reference”.

[0084] In a possible embodiment, the processor is specifically configured to: acquire a plurality of displacement data continuously measured by each relative displacement sensor in a current period; calculate the average value of the plurality of displacement data corresponding to each relative displacement sensor; and take the average value as the length change of the corresponding measuring line.

[0085] In the specific implementation process, the sampling interval of each displacement sensor is 1 s, N (N≥3) displacement data continuously sampled for the A displacement sensor, and the average value of the N displacement data is taken as the length change of the A measuring line, i.e. ΔL A. N displacement data continuously sampled for the B displacement sensor, and the average value of the N displacement data is taken as the length change of the B measuring line, i.e. ΔL B. N displacement data continuously sampled for the C displacement sensor, and the average value of the N displacement data is taken as the length change of the C measuring line, i.e. ΔL C. N displacement data continuously sampled for the D displacement sensor, and the average value of the N displacement data is taken as the length change of the D measuring line, i.e. ΔL D.

[0086] Considering that the field environment of the power transmission tower is complex, the output of the displacement sensor is easily affected by electromagnetic interference, slight wind vibration and the like, and high-frequency random noise is generated. In the embodiment of the application, the sampled data output by each relative displacement sensor is subjected to sliding average filtering, which can effectively smooth the random fluctuations and filter out high-frequency noise, so that the obtained displacement data is closer to the true displacement, thereby providing a high-quality data basis for subsequent displacement judgment.

[0087] In a possible embodiment, the processor is further configured to: before calculating the average value of the plurality of displacement data corresponding to each relative displacement sensor, delete, from the plurality of displacement data, displacement data that does not satisfy a preset valid value range.

[0088] In the specific implementation process, the valid value range is set according to the maximum displacement that can be borne by the power transmission tower, for example, [-50mm, 50mm]. The processor sequentially traverses, in the sampling order, N original displacement data newly and continuously collected by each relative displacement sensor, and if any original displacement data satisfies [-50mm, 50mm], the original displacement data is retained. If any original displacement data does not satisfy [-50mm, 50mm], the original displacement data is determined as abnormal displacement data and is directly deleted.

[0089] Further, the number of valid original displacement data is checked, and if the number is greater than or equal to 3, the average value is directly calculated according to the valid original displacement data. If the number is less than 3, one original displacement data is additionally collected (because the sampling interval is only 1s, the real-time performance is not affected), and the average value is calculated again after the additional collection. If the original displacement data collected for three times in succession all exceeds the valid value range, a sensor fault warning is triggered, for example, the processor displays “the original data of sensor A is abnormal, please check the measurement line”.

[0090] In the embodiment of the application, by performing range checking on the original displacement data, abnormal displacement data in extreme cases, for example, instantaneous sensor failure (such as measurement line jamming) and extreme interference (such as strong wind pulling the measurement line), can be quickly filtered out, so that the average value calculated subsequently is prevented from deviating from the true value seriously, and the accuracy and reliability of the monitoring result of the system are fundamentally guaranteed.

[0091] In a possible embodiment, the processor is further configured to:

[0092] Before the average value is taken as the length change of the corresponding measurement line, it is determined that the absolute value of the difference between the average value and a historical average value is less than a preset change threshold value, and the historical average value is an average value calculated according to displacement data of a last period.

[0093] In the specific implementation process, the absolute value of the difference between the average value of the current cycle and the average value of the previous cycle is verified to be less than the preset change threshold (e.g., 10 mm). If the absolute value of the difference is less than the preset change threshold, the average value of the current cycle is used as the length change of the corresponding measurement line.

[0094] If the absolute value of the difference is greater than or equal to the preset change threshold, it indicates that the sensor may be loose, the measuring line may be broken, or there may be sudden mechanical interference (such as a tree branch hitting the measuring line). In this case, the use of the average value for displacement determination is suspended, and the sensor is immediately resampled (three times consecutively, with a 0.5s interval). If the difference between the three calculated average values ​​and the previous calculated average value is still greater than the preset change threshold, an emergency fault alarm is triggered (e.g., a message indicating "Displacement sensor A data sudden change, possibly loose / broken, requires on-site inspection"), and pushed remotely to the maintenance platform. During the fault of displacement sensor A, a "simplified feature vector" is constructed using valid data from the other three displacement sensors (e.g., ignoring sensor A and encoding it with [0, ΔLB, ΔLC, ΔLD]) to temporarily determine displacement, ensuring uninterrupted monitoring.

[0095] Range verification can only filter out instantaneous, large abrupt changes, but it is powerless against gradual data shifts caused by slow degradation of sensor performance or slow, continuous structural creep. In this embodiment, by comparing the current average value with the historical average value, such slow trends can be effectively detected, thereby ensuring data stability.

[0096] For example, the five raw displacement data points continuously sampled by displacement sensor A are: 20.8mm, 21.0mm, 20.9mm, 100mm, and 21.1mm. The 100mm value far exceeds the maximum displacement of 50mm that the transmission tower can withstand, so it is discarded first. Then, the average value of the remaining four displacement data points is calculated as: (20.8 + 21.0 + 20.9 + 21.1) / 4 = 20.95mm. This calculated average value of 20.95mm is within the preset valid value range [-50mm, 50mm], and the previous calculated average value was 20.90mm. The difference between the two is: 20.95 - 20.90 = 0.05mm ≤ 10mm, so the verification is passed. Therefore, 20.95mm is taken as the change in length of the measuring line A.

[0097] In the embodiments of the present application, at the data entry, range verification is set up to perform a rough screening based on physical possibilities and filter out instantaneous巨变; in data processing, based on statistical principles, smoothing random noise is performed through moving average filtering; before data output, stability verification is set up to verify the reasonableness of the trend based on time series rules. Through the three verification systems of range verification, moving average filtering, and stability verification, the robustness of the system in the face of complex and diverse on-site interference is greatly enhanced, ensuring that the length change amount finally used for decision-making is continuous, stable, and reliable.

[0098] In a possible embodiment, the processor is specifically configured to: if the absolute values of the length change amounts of the four measurement lines are all less than a preset change amount, it is determined that the transmission tower has not displaced; if the absolute value of the length change amount of any one of the measurement lines is greater than or equal to the preset change amount, it is determined that the transmission tower has displaced.

[0099] In the specific implementation process, after the processor obtains the length change amounts of the four measurement lines, it determines whether the absolute value of the length change amount of each measurement line is less than a preset change amount (such as 0.5 mm). If |ΔL Jia| < 0.5 mm and |ΔL Yi| < 0.5 mm and |ΔL Bing| < 0.5 mm and |ΔL Ding| < 0.5 mm, it is determined that the transmission tower has not displaced; if |ΔL Jia| ≥ 0.5 mm or |ΔL Yi| ≥ 0.5 mm or |ΔL Bing| ≥ 0.5 mm or |ΔL Ding| ≥ 0.5 mm, it is determined that the transmission tower has displaced.

[0100] Considering that the transmission tower will generate small and high-frequency measurement noises due to micro-vibration, temperature change, and electromagnetic interference during actual operation. Therefore, in the embodiments of the present application, by setting a reasonable preset change amount (such as 0.5 mm), the system can effectively filter out these harmless small fluctuations. Only when the displacement signal intensity exceeds this threshold is it recognized as an effective displacement, greatly improving the credibility of the monitoring results.

[0101] In a possible embodiment, the processor is further configured to: after determining that the transmission tower has displaced, convert the length change amounts of the four measurement lines into discrete feature vectors; each element in the feature vector is used to represent the numerical size level of the length change amount of the corresponding measurement line; according to the feature vector and the length change amounts of the four measurement lines, query the pre-stored data table to determine the column foot and direction of the transmission tower's displacement.

[0102] In the implementation process, if the length variation of the ith measurement line ΔLi is greater than 0.5 mm, the code is 1; if the absolute value of the length variation of the ith measurement line |ΔLi| is less than or equal to 0.5 mm, the code is 0; if the length variation of the ith measurement line ΔLi is less than -0.5 mm, the code is -1. For example, the feature vector is [1, 0, 0, 1], which indicates that ΔL1 is greater than 0.5 mm, |ΔL2| is less than or equal to 0.5 mm, |ΔL3| is less than or equal to 0.5 mm, and ΔL4 is greater than 0.5 mm.

[0103] The processor pre-stores a data table recording the displacement column foot and the displacement direction corresponding to different feature vectors and different length variations. The developer can pre-apply a series of known displacement amounts to each column foot in each direction (positive / negative direction of the X / Y axis) in which the column foot can move. After each known displacement is applied, the four sets of length variations (ΔL1, ΔL2, ΔL3, ΔL4) corresponding to the four relative displacement sensors are accurately measured and recorded. Through a large number of such experiments, a “displacement-length variation” original data set covering various single-column foot and multi-column foot displacement scenarios is formed.

[0104] The original data set is verified, cleaned and summarized. Each set of length variations (ΔL1, ΔL2, ΔL3, ΔL4) is converted into a corresponding discrete feature vector, and the summarized data is compiled into a data table. The data table records the mapping relationship between the displacement scenario, the feature vector, the numerical constraint condition of the length variation, the displacement column foot and the displacement direction. Part of the data table is shown in Table 1.

[0105] Table 1

[0106]

[0107] After the processor obtains the feature vector and the length variations of the four measurement lines, the pre-stored data table is queried. If there is only one feature vector in the data table, the displacement column foot and the displacement direction corresponding to the feature vector are determined as the displacement column foot and the displacement direction of the power tower pole. If there is more than one feature vector in the data table, the displacement column foot and the displacement direction corresponding to the combination of the length variations of the four measurement lines are determined as the displacement column foot and the displacement direction of the power tower pole.

[0108] In the embodiments of the present application, the lookup table method can be used to quickly locate the column foot and direction of the power tower pole that has been displaced. The calculation amount of the feature vector conversion and the table lookup operation is extremely small, and complex matrix operations or iterative solutions are not required. This enables the processor to complete the diagnosis within milliseconds, greatly improving the response speed of the monitoring system.

[0109] In a possible embodiment, the processor is further configured to: after determining the foot of the transmission tower that has displacement and the displacement direction, generate early warning instructions of different levels according to the number of feet that have displacement and the maximum length change amount in the length change amounts of the four measurement lines.

[0110] The traditional monitoring often only provides "yes / no" alarms, and in the embodiment of the application, the two key indicators of the number of feet and the maximum length change amount are introduced, so that the quantification and grading of the safety risk of the transmission tower are realized. This enables the system to accurately distinguish different properties and different levels of safety threats, thereby providing a decisive basis for realizing precise and differentiated operation and maintenance responses. Through early warning, operation and maintenance personnel can actively intervene and eliminate hidden dangers, effectively prevent major safety accidents such as transmission tower line breakage, and significantly improve the safety level of power grid infrastructure.

[0111] In a possible embodiment, the processor is specifically configured to:

[0112] if a single foot has displacement and the maximum length change amount reaches a first numerical range, a record data instruction is generated;

[0113] if a single foot has displacement and the maximum length change amount reaches a second numerical range, or four feet have displacement and the maximum length change amount reaches a third numerical range, a tower end sound and light alarm instruction and a field review early warning instruction are generated; the second numerical range is greater than the first numerical range;

[0114] if a single foot has displacement and the maximum length change amount reaches a fourth numerical range, or two feet have displacement and the maximum length change amount reaches a fifth numerical range, an emergency repair instruction and a linkage dispatch center instruction are generated; the fourth numerical range is greater than the second numerical range;

[0115] if four feet have displacement and the maximum length change amount reaches a sixth numerical range, an emergency repair instruction and a shutdown suggestion instruction are generated; the sixth numerical range is greater than the third numerical range.

[0116] In the specific implementation process, generating early warning instructions of different levels includes the following cases:

[0117] (1) Low risk

[0118] single foot displacement and maximum length change amount reaching a first numerical range (0.5mm≤ΔLi<5mm): only daily storage of displacement data, no active early warning.

[0119] (2) Moderate risk

[0120] When the single column foot displacement reaches a second numerical range (5mm≤ΔLi<10mm) or the overall slip reaches a third numerical range (0.5mm≤ΔLi<15mm), the tower end acousto-optic alarm and remote push pre-alarm are triggered, prompting "48-72 hours of on-site review".

[0121] (3) High risk

[0122] When the single column foot displacement reaches a fourth numerical range (ΔLi≥10mm) or the double column foot displacement reaches a fifth numerical range (ΔLi≥8mm), an emergency repair work order is issued and the linkage dispatch center is triggered, prompting "12-24 hours of on-site repair".

[0123] (4) Extremely high risk

[0124] When the overall slip reaches a sixth numerical range (ΔLi≥15mm), an emergency repair work order is issued and the dispatch center is reported to suggest line outage, prompting "6 hours of on-site disposal".

[0125] In the embodiments of the present application, for low risk, only data is recorded, without occupying any on-site operation and maintenance resources, realizing intelligent monitoring without human intervention. For medium risk, pre-alarm is started, and planned on-site review is arranged, and resource allocation is comfortable and orderly. For high risk and extremely high risk, an emergency work order is automatically generated, the linkage dispatch center is triggered, and precise resources are quickly allocated for emergency disposal. According to the urgency of the risk, the corresponding level of response process is automatically triggered, realizing on-demand allocation and optimal configuration of operation and maintenance resources, avoiding resource waste caused by excessive operation and maintenance, and avoiding risk escalation caused by insufficient operation and maintenance.

[0126] Based on the same inventive concept, the embodiments of the present application also provide a column foot displacement monitoring method of a power transmission tower, applied to a processor of a column foot displacement monitoring system of a power transmission tower. Please refer to Figure 3 The flowchart of the column foot displacement monitoring method of the power transmission tower provided by the embodiments of the present application, the method comprises:

[0127] S301, the displacement data measured by each relative displacement sensor is taken as the length change of the corresponding measurement line.

[0128] S302, according to the length change of the four measurement lines, whether the power transmission tower has displacement is determined.

[0129] Optionally, taking the displacement data measured by each relative displacement sensor as the length change of the corresponding measurement line comprises:

[0130] Respectively acquiring a plurality of displacement data continuously measured by each relative displacement sensor in the current period;

[0131] calculating an average value of the plurality of displacement data corresponding to each relative displacement sensor;

[0132] taking the average value as a length variation of the corresponding measurement line.

[0133] Optionally, before calculating the average value of the plurality of displacement data corresponding to each relative displacement sensor, the method further comprises:

[0134] from the plurality of displacement data, deleting displacement data not satisfying a preset valid value range.

[0135] Optionally, before taking the average value as the length variation of the corresponding measurement line, the method further comprises:

[0136] determining that an absolute value of a difference between the average value and a historical average value is less than a preset variation threshold; the historical average value is an average value calculated according to displacement data of a last period.

[0137] Optionally, according to the length variations of the four measurement lines, determining whether the power transmission tower has displacement, comprises:

[0138] if absolute values of the length variations of the four measurement lines are all less than a preset variation, determining that the power transmission tower has no displacement;

[0139] if an absolute value of the length variation of any one of the measurement lines is greater than or equal to the preset variation, determining that the power transmission tower has displacement.

[0140] Optionally, after determining that the power transmission tower has displacement, the method further comprises:

[0141] converting the length variations of the four measurement lines into a discrete feature vector; each element in the feature vector is used to represent a numerical size level of the length variation of the corresponding measurement line;

[0142] according to the feature vector and the length variations of the four measurement lines, querying a pre-stored data table to determine a column foot and a direction of displacement of the power transmission tower; the data table records displacement column feet and displacement directions corresponding to different feature vectors and different length variations.

[0143] Optionally, after determining the column foot and the direction of displacement of the power transmission tower, the method further comprises:

[0144] generating different levels of warning instructions according to the number of column feet having displacement and a maximum length variation in the length variations of the four measurement lines.

[0145] Optionally, generating different levels of warning instructions according to the number of column feet having displacement and a maximum length variation in the length variations of the four measurement lines, comprises:

[0146] If the single column foot displacement and the maximum length change reaches the first numerical range, a record data instruction is generated;

[0147] If the single column foot displacement and the maximum length change reaches the second numerical range, or, four column feet displacement and the maximum length change reaches the third numerical range, a tower end sound and light alarm instruction and a field review early warning instruction are generated; the second numerical range is greater than the first numerical range;

[0148] If the single column foot displacement and the maximum length change reaches the fourth numerical range, or, two column feet displacement and the maximum length change reaches the fifth numerical range, an emergency repair instruction and a linkage dispatch center instruction are generated; the fourth numerical range is greater than the second numerical range;

[0149] If four column feet displacement and the maximum length change reaches the sixth numerical range, an emergency repair instruction and a shutdown suggestion instruction are generated.

[0150] The column foot displacement monitoring method of the power transmission tower provided by the application is described below by taking the displacement of a single A column foot (x axis negative direction, y axis positive direction) as an example.

[0151] S1, data acquisition:

[0152] The original displacement data (mm) collected by the A displacement sensor is 20.8, 21.0, 20.9, 21.1, and 20.8, and the sliding average filtering ΔL A = 20.92 mm; similarly, ΔL D = 24.58 mm; ΔL B = 0.2 mm; and ΔL C = 0.3 mm.

[0153] S2, data verification:

[0154] All ΔLs are within [-50mm, 50mm], and the difference between adjacent filtered data is less than or equal to 0.02mm, so the data is determined to be valid.

[0155] S3, feature vector construction:

[0156] ΔL A > 0.5mm (coded as 1), ΔL B < 0.5mm (coded as 0), ΔL C < 0.5mm (coded as 0), and ΔL D > 0.5mm (coded as 1), so the corresponding feature vector is [1, 0, 0, 1].

[0157] S4, scene matching:

[0158] Referring to Table 1, there is more than one feature vector [1, 0, 0, 1] in Table 1, and according to "ΔL D / 2 < ΔL A < ΔL D", it is determined that the A column foot displacement is in the x axis negative direction and the y axis positive direction.

[0159] S5, early warning triggering:

[0160] ΔL1 = 20.92mm ≥ 10mm, which belongs to high risk, and emergency maintenance instructions and linkage scheduling center instructions are generated.

[0161] In summary, the embodiment of the present application provides a column foot displacement monitoring method of a power transmission tower, which can effectively monitor the relative displacement between the four column feet of the power transmission tower in the case of simultaneous and same direction movement of the four column feet, i.e., overall slippage, and overcomes the problem that the prior art is difficult to monitor the relative displacement in the case of overall slippage. Through analysis of the sensor measurement of the rope length change, the column foot that has occurred displacement and the displacement direction can be accurately determined, the monitoring accuracy is high, and a reliable guarantee is provided for the safe operation of the power transmission tower.

[0162] Based on the same inventive concept, the present application further provides an electronic device, a computer device including a processor, a memory, and a computer program stored in the memory, and the computer program realizes the column foot displacement monitoring method of the power transmission tower when executed by the processor.

[0163] Based on the same inventive concept, the present application further provides a computer storage medium, and the computer storage medium stores a computer program, and the computer program realizes the column foot displacement monitoring method of the power transmission tower when executed by the processor.

[0164] In some embodiments, the computer readable storage medium can be a memory such as FRAM, ROM, PROM, EPROM, EEPROM, flash memory, magnetic surface memory, optical disc, or CD-ROM; or various devices including one or any combination of the above memories. The computer can be various computing devices including smart terminals and servers.

[0165] In some embodiments, the executable instructions can be in the form of programs, software, software modules, scripts or codes, written in any form of programming language (including compiled or interpreted languages, or declarative or procedural languages), and can be deployed in any form, including being deployed as independent programs or as modules, components, subroutines or other units suitable for use in computing environments.

[0166] As an example, the executable instructions can but not necessarily correspond to files in a file system, can be stored in a part of a file storing other programs or data, for example, stored in one or more scripts in a HyperText Markup Language (HTML) document, stored in a single file dedicated to the program in question, or stored in multiple cooperative files (for example, files storing one or more modules, subroutines or code portions).

[0167] By way of example, the executable instructions can be deployed to be executed on one computer, or on multiple computers of a distributed system at one location, or on multiple computers of a distributed system located at multiple locations and interconnected through a communication network.

[0168] It has to be remarked that, in this text, the terms "comprising", "including", or any other variant thereof, are intended to cover a non-exclusive inclusion, such that processes, methods, articles, or systems that comprise a list of elements are not limited to those elements, but can also include other elements not expressly listed, or inherent to such processes, methods, articles, or systems. Without further limitation, an element defined by the statement "comprising a" does not exclude the presence of additional identical elements in the process, method, article, or system that includes the element.

[0169] The above-mentioned sequence numbers of the embodiments of the present application are only for description, and do not represent advantages or disadvantages of the embodiments.

[0170] The above detailed description has further explained the purpose, technical solutions and advantages of the present application. It should be understood that the above is only a specific implementation of the present application, and is not used to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A system for monitoring the displacement of the base of a transmission tower, characterized in that, The system is applied to a power transmission tower including four column feet, the four column feet including an A column foot, a B column foot, a C column foot and a D column foot; the system includes: a fixed point, arranged at a geometric center of the power transmission tower during installation of the power transmission tower; two pulleys, including an A fixed pulley arranged at the A column foot and a B fixed pulley arranged at the B column foot; four relative displacement sensors, including an alpha sensor and a beta sensor arranged at the C column foot and a gamma sensor and a delta sensor arranged at the D column foot; the four relative displacement sensors are all subjected to a zero reset operation when installation and debugging of the power transmission tower are completed; four measurement lines, including an alpha measurement line, a beta measurement line, a gamma measurement line and a delta measurement line; wherein the alpha measurement line is connected to the alpha sensor after passing through the B fixed pulley and the A fixed pulley in sequence from the fixed point; the beta measurement line is directly connected to the beta sensor from the fixed point; the gamma measurement line is directly connected to the gamma sensor from the fixed point; and the delta measurement line is connected to the delta sensor after passing through the A fixed pulley and the B fixed pulley in sequence from the fixed point; a processor, in communication connection with the four relative displacement sensors respectively, for taking displacement data measured by each relative displacement sensor as a length change of a corresponding measurement line, determining that the power transmission tower does not displace if absolute values of the length changes of the four measurement lines are all less than a preset change, determining that the power transmission tower displaces if the absolute value of the length change of any measurement line is greater than or equal to the preset change, converting the length changes of the four measurement lines into a discrete feature vector, querying a pre-stored data table according to the feature vector and the length changes of the four measurement lines to determine a column foot and a direction in which the power transmission tower displaces, and taking each element in the feature vector to represent a numerical size level of the length change of a corresponding measurement line, and the data table records displacement column feet and displacement directions corresponding to different feature vectors and different length changes.

2. The foundation displacement monitoring system of a power transmission tower according to claim 1, wherein, The processor is specifically configured to: acquire a plurality of displacement data continuously measured by each relative displacement sensor in a current period respectively; calculate an average value of the plurality of displacement data corresponding to each relative displacement sensor; take the average value as the length change of a corresponding measurement line.

3. The foundation displacement monitoring system of a power transmission tower according to claim 2, wherein, The processor is further configured to: before calculating the average value of the plurality of displacement data corresponding to each relative displacement sensor, delete displacement data not satisfying a preset effective value range from the plurality of displacement data.

4. The foundation displacement monitoring system of a power transmission tower according to claim 3, wherein, The processor is further configured to: before taking the average value as the length change of a corresponding measurement line, determine that an absolute value of a difference between the average value and a historical average value is less than a preset change threshold; the historical average value is an average value calculated according to displacement data of a last period.

5. The foundation displacement monitoring system of the electric transmission tower according to claim 1, wherein, The processor is further configured to: after determining the column foot and the direction in which the power transmission tower displaces, generate different levels of early warning instructions according to a number of column feet displacing and a maximum length change in the length changes of the four measurement lines.

6. The foundation displacement monitoring system of a power transmission tower according to claim 5, wherein, The processor is specifically configured to: If displacement of a single column foot occurs and the maximum length variation reaches a first numerical range, a record data instruction is generated; If displacement of a single column foot occurs and the maximum length variation reaches a second numerical range, or displacement of four column feet occurs and the maximum length variation reaches a third numerical range, a tower end audible and visual alarm instruction and a field review early warning instruction are generated; the second numerical range is greater than the first numerical range; If displacement of a single column foot occurs and the maximum length variation reaches a fourth numerical range, or displacement of two column feet occurs and the maximum length variation reaches a fifth numerical range, an emergency maintenance instruction and a linkage dispatch center instruction are generated; the fourth numerical range is greater than the second numerical range; If displacement of four column feet occurs and the maximum length variation reaches a sixth numerical range, an emergency maintenance instruction and a shutdown suggestion instruction are generated; the sixth numerical range is greater than the third numerical range.

7. A method of monitoring displacement of a footing of a power transmission tower, characterized by, The method is applied to the column foot displacement monitoring system of the power transmission tower as claimed in any one of claims 1-6, and the method comprises: The displacement data measured by each relative displacement sensor is taken as the length variation of the corresponding measurement line; If the absolute values of the length variations of the four measurement lines are all less than a preset variation, it is determined that the power transmission tower does not displace; If the absolute value of the length variation of any measurement line is greater than or equal to the preset variation, it is determined that the power transmission tower displaces; the length variations of the four measurement lines are converted into a discrete feature vector; according to the feature vector and the length variations of the four measurement lines, a pre-stored data table is inquired to determine the column foot and direction of displacement of the power transmission tower; each element in the feature vector is used to represent the numerical value size level of the length variation of the corresponding measurement line; the data table records the displacement column foot and displacement direction corresponding to different feature vectors and different length variations.

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