A data processing method for spacer rod vibration test

Abstract

The present invention relates to the field of data processing technology, and in particular to a method for processing spacer bar vibration test data, the method comprising: collecting vibration accelerations of each sub-conductor connected to the spacer bar; presetting a sliding window, calculating the dancing possibility of each sub-conductor in the sliding window, taking the ratio of the dancing possibility corresponding to the sub-conductor to the sum of the dancing possibilities corresponding to all sub-conductors in the sliding window as a weight, and based on the weight, smoothing the vibration acceleration of the sub-conductor. The present invention assigns a weight related to the dancing possibility to each vibration acceleration, uses a weighted moving average to more accurately reflect the acceleration change caused by the dancing of the sub-conductor, and reduces the influence of noise data on the vibration analysis of the spacer bar.

Description

Technical Field

[0001] The present invention relates to the technical field of data processing, and more specifically, to a method for processing spacer rod vibration test data. Background Art

[0002] In high-voltage transmission lines, spacers are used to maintain a fixed distance between split conductors to prevent them from colliding with each other or swinging excessively due to natural conditions such as wind and icing. This stability is essential to avoid short circuits between conductors, reduce maintenance costs, and extend equipment life. Since the spacers are directly connected to the conductors, the power they bear comes directly from the reaction of the conductors to wind excitation, icing and short-circuit electromagnetic impact. Therefore, the spacers must have sufficient mechanical strength and good dynamic response characteristics to adapt to the behavior of the conductors under different environmental conditions.

[0003] At present, the prior art, such as the patent application document with publication number CN114039320A, discloses a damping spacer and a vibration reduction optimization method thereof, which includes: obtaining the amplitude and speed of each spacer; constructing differential vibration equations in different directions; analyzing the inherent properties of the damping spacer to obtain vibration absorption performance; optimizing structural parameters to obtain a structural parameter combination with the best vibration reduction effect. The vibration reduction optimization method obtains structural parameters by optimizing the damping spacer, so that when the wind-induced vibration of the conductor occurs, the more energy the damping spacer loses, the smaller the displacement amplitude of the conductor.

[0004] However, when obtaining the vibration data of the spacer rods, the environment in which the spacer rods and conductors are located is susceptible to electromagnetic interference, which generates certain noise data. In addition, the vibration data caused by strong winds may be similar to the noise data in frequency and amplitude, making it difficult to distinguish from the data whether it is a real vibration signal or just noise, resulting in inaccurate vibration data obtained, making it impossible to correctly evaluate the performance of the spacer rods, affecting the safe operation of the transmission line. Summary of the invention

[0005] In order to solve the above technical problem that the accuracy of the performance analysis of the spacer rods is reduced due to inaccurate vibration data obtained, the present invention provides the following solution.

[0006] A spacer rod vibration test data processing method, comprising:

[0007] Collecting the vibration acceleration of each sub-conductor connected to the spacer bar;

[0008] A sliding window is preset, and the dancing possibility of each sub-conductor in the sliding window is calculated. The ratio of the dancing possibility corresponding to the sub-conductor to the sum of the dancing possibilities corresponding to all sub-conductors in the sliding window is used as a weight. Based on the weight, the vibration acceleration of the sub-conductor is smoothed; wherein the dancing possibility is:

[0009] In the formula, For the Moment The dancing possibility of the strip wires, For the Moment The vibration acceleration of the wire strip, For the The average value of the vibration acceleration of the conductor at all times, For the The maximum value of the vibration acceleration of the wire strip at all times, is the correction factor, which is negatively correlated with the dancing intensity of the sub-conductor.

[0010] The present invention first calculates the galloping possibility of each sub-conductor, and then allocates a dynamic weight to each sub-conductor by calculating the ratio of the galloping possibility of each sub-conductor to the sum of the galloping possibilities of all sub-conductors in a sliding window, and further smoothes the vibration acceleration of the sub-conductor to more accurately reflect the acceleration changes caused by the galloping of the sub-conductor, while reducing the influence of noise data on the vibration analysis of the spacer rod.

[0011] Preferably, the method further includes collecting wind speed vector.

[0012] By collecting the wind speed vector (including the magnitude and direction of the wind speed), the dancing of the sub-conductor can be evaluated more accurately.

[0013] Preferably, collecting the vibration acceleration of each sub-conductor connected to the spacer bar includes:

[0014] Collect the vibration acceleration of each sub-conductor connected to the spacer rod in multiple dimensions, and take the sum of the vibration acceleration of the sub-conductor in all dimensions as the vibration acceleration of the sub-conductor;

[0015] The average of the sum of the vibration accelerations of all sub-conductors in any dimension is taken as the acceleration of the corresponding dimension of the spacer bar, and the sum of the accelerations of all dimensions of the spacer bar is taken as the acceleration of the spacer bar.

[0016] Through multi-dimensional vibration acceleration acquisition, the vibration characteristics of the sub-conductor can be captured more comprehensively. Comprehensive analysis of the vibration acceleration of multiple sub-conductors can reduce the accidental error of the vibration data of a single sub-conductor, thereby improving the accuracy and reliability of the overall measurement.

[0017] Preferably, the dancing intensity satisfies the relationship:

[0018] ; In the formula, For the Moment The dancing intensity of the strip conductor, For the Moment The cosine similarity between the vibration acceleration of the conductor strip and the acceleration of the spacer bar, For the Moment The cosine similarity between the vibration acceleration of the strip conductor and the wind speed vector, It is an exponential function with the natural constant e as its base.

[0019] By analyzing the similarity between the vibration acceleration of the sub-conductor and the acceleration of the spacer rod and the wind speed vector, the dancing intensity is calculated. By analyzing the dancing intensity, it is possible to identify which sub-conductors are more likely to dance under specific conditions.

[0020] Preferably, the correction factor satisfies the relationship:

[0021] ; In the formula, is the correction factor, For the Moment The dancing intensity of the strip conductor, It is an exponential function with the natural constant e as its base.

[0022] By using an exponential function to perform a nonlinear transformation on the dancing intensity, the correction factor can dynamically adjust the dancing probability of each sub-conductor according to the change in dancing intensity. This dynamic adjustment helps to more accurately reflect the dancing risk under different conditions.

[0023] Preferably, the weight also includes:

[0024] The ratio of the dancing possibility corresponding to the sub-conductor in each dimension to the sum of the dancing possibilities corresponding to the same dimension of all sub-conductors in the sliding window is used as the weight in the dimension.

[0025] Preferably, the smoothing step comprises:

[0026] Based on the weights, a weighted moving average is performed on the multi-dimensional vibration acceleration of the sub-conductor to obtain a weighted moving average value of the multi-dimensional vibration acceleration of the sub-conductor.

[0027] Preferably, the dancing intensity satisfies the relationship:

[0028] ; In the formula, For the Moment The dancing intensity of the strip conductor, For the Moment The vibration acceleration of the wire strip, For the Moment The angle between the vibration acceleration of the conductor strip and the wind speed vector, , are all constants.

[0029] Preferably, the correction factor satisfies the relationship:

[0030] ; In the formula, is the correction factor, For the Moment The dancing intensity of the strip conductor, is a constant, It is a logarithmic function with the natural constant e as the base.

[0031] The beneficial effects of the present invention are:

[0032] The present invention distinguishes data generated by the dancing of the sub-conductor from noise data by assigning a weight related to its dancing probability to each vibration acceleration. Since the data generated by the dancing usually have a higher dancing probability, they will be assigned a higher weight. On the contrary, the noise data usually has a lower dancing probability and will be assigned a lower weight. In this way, the weighted moving average is used to more accurately reflect the acceleration changes caused by the dancing of the sub-conductor, while reducing the influence of the noise data on the vibration analysis of the spacer bar. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0034] Figure 1 It is a method flow chart of steps S1 to S2 in a method for processing spacer rod vibration test data in embodiment 1 of the present invention. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are 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 those skilled in the art without creative work are within the scope of protection of the present invention.

[0036] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0037] Reference Figure 1 A method for processing spacer rod vibration test data includes steps S1 and S2, which are specifically as follows:

[0038] S1: Collect the vibration acceleration of each sub-conductor connected to the spacer bar.

[0039] In transmission lines, the main function of the spacer is to fix the relative position between the split conductors, prevent the conductors from whipping each other, and suppress breeze vibration and sub-span oscillation. Since the conductors are closely connected to the spacer, when the conductors are affected by natural factors such as wind and ice and vibrate, these vibrations will be transmitted to the spacer through the conductors.

[0040] Therefore, in Example 1 of the present invention, an acceleration sensor is arranged on each sub-conductor (in the implementation of the present invention, 4 sub-conductors are arranged) in the high-altitude power transmission line to monitor the dynamic response of the conductor in real time, such as vibration acceleration, vibration frequency, etc. In order to maintain consistency and comparability, all acceleration sensors should be arranged on the same side of the spacer bar and at an equal distance from the spacer bar.

[0041] It should be noted that the wire vibration is a complex three-dimensional movement, including movement in the three directions of wind, vertical wind and torsion. There may be coupling effects between vibrations in different directions. For example, the coupling of horizontal vibration and vertical vibration may cause vertical dancing. Therefore, in order to more comprehensively analyze and predict the vibration behavior of the wire, a three-axis accelerometer is used for data acquisition. The acquisition time is 30 minutes, and the data is collected once per second.

[0042] Furthermore, in Example 1 of the present invention, there are 4 sub-conductors on the spacer rod, and each sub-conductor has vibration acceleration components in three directions (X, Y, and Z directions, or understood as horizontal, vertical, and another orthogonal direction). According to the vector addition principle, the vibration acceleration components of each sub-conductor in three directions are added together to obtain the vibration acceleration (with direction and magnitude) of the sub-conductor.

[0043] The average value of the sum of the vibration accelerations of all sub-conductors in any direction is taken as the acceleration of the spacer in the corresponding direction, and the sum of the accelerations of the spacer in all directions is taken as the acceleration of the spacer.

[0044] In addition, the influence of wind speed on the dynamic characteristics of the conductor needs to be considered. Wind speed acts as an external force on the conductor, which changes the motion state of the conductor and generates acceleration. Therefore, a wind speed sensor is used to synchronously collect the wind speed vector. It should be noted that in Example 1 of the present invention, the wind speed sensor outputs the wind speed and a clear wind direction, and the collected wind speed vector is normalized.

[0045] S2: Preset a sliding window, calculate the dancing possibility of each sub-conductor in the sliding window, take the ratio of the dancing possibility corresponding to the sub-conductor to the sum of the dancing possibilities corresponding to all sub-conductors in the sliding window as a weight, and smooth the vibration acceleration of the sub-conductor based on the weight.

[0046] Since the spacers connect the sub-conductors, the dancing of the sub-conductors will be transmitted to other sub-conductors through the spacers. When the sub-conductors dance under the action of wind, they will produce rapidly changing accelerations. These sudden acceleration data are key information for analyzing the dynamic behavior of the sub-conductors. If these data are over-processed during the smoothing process, it may lead to misunderstanding of the actual dynamic characteristics of the sub-conductors. In order to correctly process these sudden data, the dancing state of each sub-conductor needs to be measured.

[0047] According to the vibration acceleration of the sub-conductor and the vibration acceleration of the spacer calculated in step S1 above, the cosine similarity between the two is calculated, that is, the cosine value of the angle between the vibration acceleration of the sub-conductor and the acceleration of the spacer is measured to evaluate the similarity between the two directions. The closer the cosine value is to 1, the more similar the directions are; the closer it is to -1, the more opposite the directions are; and the closer it is to 0, the directions are almost perpendicular.

[0048] Similarly, the cosine similarity between the vibration acceleration of the sub-conductor and the wind speed vector is calculated to measure the cosine value of the angle between the two, which is used to evaluate the similarity between the acceleration direction of the sub-conductor and the wind speed direction.

[0049] Further calculation of the dancing intensity of the sub-conductor leads to the relationship that the dancing intensity of the sub-conductor leads satisfies the following equation:

[0050]

[0051] In the formula, For the Moment The dancing intensity of the strip conductor, For the Moment The cosine similarity between the vibration acceleration of the conductor strip and the acceleration of the spacer bar, For the Moment The cosine similarity between the vibration acceleration of the strip conductor and the wind speed vector, It is an exponential function with the natural constant e as its base.

[0052] Furthermore, the vibration intensity of the spacer rod is calculated to satisfy the following relationship:

[0053]

[0054] In the formula, For the The vibration intensity of the time interval rod, For the At this moment, all sub-wires are The average value of vibration acceleration in each direction, is the maximum value of the collected vibration acceleration.

[0055] Furthermore, based on the correlation between the spacer and the sub-conductor, the vibration transmission effect and safety, the vibration intensity of the spacer is adjusted. The method is introduced into the calculation of the dancing intensity of the sub-conductor to realize the correction of the original calculation result, so that the calculation result of the dancing intensity of the sub-conductor is more accurate and reliable.

[0056] Then the galloping intensity of the sub-conductor after the introduction of the vibration intensity of the spacer rod satisfies the relationship:

[0057]

[0058] Usually, the sub-conductor is closely connected to the spacer. When the spacer has a high vibration intensity, the sub-conductor on the spacer will also have a more violent dance change, so the vibration intensity of the spacer The original calculation results are corrected upwards. The larger it is, the greater the correction to the original calculation result.

[0059] In order to further distinguish the vibration acceleration data and noise data generated by the galloping of the sub-conductor, the galloping possibility of the vibration acceleration of the sub-conductor in each direction is calculated to more accurately analyze the results of the spacer vibration test.

[0060] Among them, taking one direction as an example, the dancing possibility of the vibration acceleration of the sub-conductor is calculated, and the relationship satisfied is:

[0061]

[0062] In the formula, For the Moment The dancing possibility of the strip wires, For the Moment The vibration acceleration of the wire strip, For the The average value of the vibration acceleration of the conductor at all times, For the The maximum value of the vibration acceleration of the wire strip at all times, is the correction factor.

[0063] Among them, the correction factor satisfies the relationship:

[0064]

[0065] In the formula, is the correction factor, For the Moment The dancing intensity of the strip conductor, It is an exponential function with the natural constant e as its base.

[0066] in, The larger the difference is, the more likely it is that the vibration acceleration of the sub-conductor is noise data or data generated by the dancing of the sub-conductor; the smaller the difference is, the more likely it is that the vibration acceleration is data when the sub-conductor is stable.

[0067] pass right Make a downward correction when The more hours, The more likely it is that the data is not generated by the dancing of the sub-conductor, the more likely it is noise data; when The bigger it is, The more likely it is that the data is generated by the dancing of the sub-wires, the The smaller the correction degree, the higher the dancing probability of the data generated by the dancing of the sub-wire is maintained.

[0068] The above calculation of the dancing possibility of the sub-conductor is based on one direction as an example, and the dancing possibility of the sub-conductors in all other directions can be calculated similarly according to the above calculation method.

[0069] Set a sliding window with a size of 100 (the size can be adjusted according to the specific situation) and use this sliding window to slide on the collected vibration acceleration. The specific steps are:

[0070] First of all, it should be made clear that in the spacer vibration test, each sub-conductor has three-dimensional acceleration data, namely the three directions mentioned above. The acceleration data in these directions are independent and may be affected by different physical factors.

[0071] Therefore, the calculated weights should also correspond to the three directions. That is to say, for each sub-conductor, the weights of each vibration acceleration in the three directions are calculated respectively, that is, the ratio of the dancing possibility corresponding to each direction of the sub-conductor to the sum of the dancing possibilities corresponding to the same direction of all sub-conductors in the sliding window is used as the corresponding weight.

[0072] For each direction of each sub-conductor on the spacer rod (a total of 4 sub-conductors, each sub-conductor has vibration acceleration data in three directions, so there are a total of 12 data sequences), the vibration acceleration data is weighted moving averaged using the weights calculated above to obtain the weighted moving average of the vibration acceleration in each direction of the sub-conductor.

[0073] By assigning each vibration acceleration a weight related to its galloping probability, the data generated by the sub-conductor galloping and the noise data are distinguished. Since the data generated by the galloping usually have a higher galloping probability, they are given a higher weight. Conversely, the noise data usually has a lower galloping probability and is therefore given a lower weight.

[0074] In this way, the weighted moving average can more accurately reflect the acceleration changes caused by the sub-conductor galloping, while reducing the impact of noise data on the spacer vibration analysis.

[0075] Embodiment 2: The overall scheme is the same as that of Embodiment 1 of the present invention, except that the calculation method of the dancing intensity of the sub-conductor is different. The calculation formula of the dancing intensity of the sub-conductor in this embodiment is:

[0076]

[0077] In the formula, For the Moment The dancing intensity of the strip conductor, For the Moment The vibration acceleration of the wire strip, For the Moment The angle between the vibration acceleration of the conductor strip and the wind speed vector, , Both are constants (the values ​​of the two constants can be set based on a series of experiments or experience).

[0078] In the description of this specification, "plurality" or "several" means at least two, such as two, three or more, etc., unless otherwise clearly and specifically defined.

[0079] Although this specification has shown and described a number of embodiments of the present invention, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Those skilled in the art will conceive of many modifications, changes and alternatives without departing from the ideas and spirit of the present invention. It should be understood that in the practice of the present invention, various alternatives to the embodiments of the present invention described herein may be employed.

Claims

1. A method for processing spacer rod vibration test data, characterized in that: include: Collecting the vibration acceleration of each sub-conductor connected to the spacer bar; A sliding window is preset, and the dancing possibility of each sub-conductor in the sliding window is calculated. The ratio of the dancing possibility corresponding to the sub-conductor to the sum of the dancing possibilities corresponding to all sub-conductors in the sliding window is used as a weight. Based on the weight, the vibration acceleration of the sub-conductor is smoothed; wherein the dancing possibility is: ; In the formula, For the Moment The dancing possibility of the strip wires, For the Moment The vibration acceleration of the wire strip, For the The average value of the vibration acceleration of the conductor at all times, For the The maximum value of the vibration acceleration of the wire strip at all times, is the correction factor, which is negatively correlated with the dancing intensity of the sub-conductor.

2. A spacer rod vibration test data processing method according to claim 1, characterized in that: It also includes collecting wind speed vectors.

3. A spacer rod vibration test data processing method according to claim 2, characterized in that: The collecting of the vibration acceleration of each sub-conductor connected to the spacer bar comprises: Collect the vibration acceleration of each sub-conductor connected to the spacer rod in multiple dimensions, and take the sum of the vibration acceleration of the sub-conductor in all dimensions as the vibration acceleration of the sub-conductor; The average of the sum of the vibration accelerations of all sub-conductors in any dimension is taken as the acceleration of the corresponding dimension of the spacer bar, and the sum of the accelerations of all dimensions of the spacer bar is taken as the acceleration of the spacer bar.

4. A spacer rod vibration test data processing method according to claim 3, characterized in that: The dancing intensity satisfies the relationship: ; In the formula, For the Moment The dancing intensity of the strip conductor, For the Moment The cosine similarity between the vibration acceleration of the conductor strip and the acceleration of the spacer bar, For the Moment The cosine similarity between the vibration acceleration of the strip conductor and the wind speed vector, It is an exponential function with the natural constant e as its base.

5. A spacer rod vibration test data processing method according to claim 4, characterized in that: The correction factor satisfies the relationship: ; In the formula, is the correction factor, For the Moment The dancing intensity of the strip conductor, It is an exponential function with the natural constant e as its base.

6. A spacer rod vibration test data processing method according to claim 5, characterized in that: The weights also include: The ratio of the dancing possibility corresponding to the sub-conductor in each dimension to the sum of the dancing possibilities corresponding to the same dimension of all sub-conductors in the sliding window is used as the weight in the dimension.

7. A spacer rod vibration test data processing method according to claim 6, characterized in that: The smoothing step comprises: Based on the weights of each dimension, a weighted moving average is performed on the vibration acceleration of each dimension of the sub-conductor to obtain a weighted moving average value of the vibration acceleration of each dimension of the sub-conductor.

8. A spacer rod vibration test data processing method according to claim 3, characterized in that: The dancing intensity satisfies the relationship: ; In the formula, For the Moment The dancing intensity of the strip conductor, For the Moment The vibration acceleration of the wire strip, For the Moment The angle between the vibration acceleration of the conductor strip and the wind speed vector, , are all constants.

9. A spacer rod vibration test data processing method according to claim 8, characterized in that: The correction factor satisfies the relationship: ; In the formula, is the correction factor, For the Moment The dancing intensity of the strip conductor, is a constant, It is a logarithmic function with the natural constant e as the base.

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