State analysis and detection method for electric power communication optical cable

Abstract

The invention relates to the technical field of electric communication transmission, in particular to a state analysis and detection method for an electric power communication optical cable, and the method comprises the steps: obtaining temperature data, strain data and optical power data in the operation process of the electric power communication optical cable, the method comprises the following steps: constructing an optical cable anomaly sensitivity index according to related characteristics among data when the state of the electric power communication optical cable is abnormal, analyzing the fluctuation of the variation trend of optical power data of the optical cable at each moment, and predicting the optical power of each position of the optical cable at each moment based on historical optical power data. Comparing with actually acquired optical power data, and combining with the abnormal sensitivity of the optical cable to obtain the abnormal operation degree of the optical cable at each moment; and performing outlier detection on the abnormal operation degrees of the optical cable at all moments, and obtaining a fault point of the optical cable in combination with the numerical distribution of the abnormal sensitivity of the optical cable. The invention aims to improve the accuracy and reliability of optical cable fault identification.

Description

Technical Field

[0001] The present application relates to the field of electric communication transmission technology, and in particular to a state analysis and detection method for electric power communication optical cables. Background Art

[0002] Power communication optical cables, often exposed to harsh weather conditions such as wind, rain, snow, and lightning strikes, often suffer from these conditions, severely impacting signal transmission efficiency and quality. With the continuous advancement of fiber-optic communication technology and the increasing maturity of optical cable inspection techniques, OTDR (Optically Tracer) technology based on Rayleigh scattering is now widely used in optical cable systems as a mainstream means of detecting the status of power communication optical cables. By measuring the intensity and return time of backscattered light in the optical fiber, OTDR can locate anomalies such as breaks and bends in the cable.

[0003] However, in actual applications, this technology relies too much on the propagation characteristics of optical signals in optical fibers. Its analysis is often limited to a single optical signal parameter, ignoring the temperature and strain change characteristics during abnormal operation of power communication optical cables and the natural aging phenomenon of optical cables. As a result, the detected optical cable operation status is prone to false alarms, making it difficult to accurately identify the actual operation status of the optical cable, which seriously affects the quality of optical fiber broadband operation services. Summary of the Invention

[0004] In view of the above, it is necessary to provide a state analysis and detection method for power communication optical cables to solve the above problems.

[0005] An embodiment of the present application provides a method for analyzing and detecting the status of a power communication optical cable, the method comprising: Obtain temperature data, strain data, and optical power data at each position of the optical cable at each moment; Taking any position of the optical cable as the center, a temperature array and a strain array of any position of the optical cable at each moment are constructed based on the temperature and strain data of all positions within the neighborhood at each moment and a preset number of moments before. The data trend characteristics and data distribution characteristics in the temperature array of each position of the optical cable at each moment are analyzed. Combined with the similarity of the changes of the temperature data of each position of the optical cable at adjacent moments and the elements of the strain array at the same position, the abnormal sensitivity of the optical cable at each position of the optical cable at each moment is determined. Analyze the volatility of the change trend of the optical power data of the optical cable at each moment to obtain the abnormal optical power gradient; preset a sliding window, analyze the volatility of the data within the sliding window, and obtain the maximum value abnormality; predict the optical power of each position of the optical cable at each moment based on the historical optical power data, and compare it with the actual collected optical power data to obtain the average deviation of the optical cable at each moment; based on the distribution of the maximum value abnormality corresponding to all abnormal power gradients of the optical cable at each moment, combined with the abnormal sensitivity of the optical cable at all positions at each moment and the average deviation, obtain the abnormal operation degree of the optical cable at each moment; Outlier detection is performed on the abnormal operation degree of the optical cable at all times, and the fault point of the optical cable is obtained by combining the numerical distribution of the abnormal sensitivity of the optical cable.

[0006] The temperature array and strain array of any position of the optical cable at each moment are specifically: Taking any position as the center, a total of a preset number of positions before and after the position are used as neighboring positions of the position; taking each moment and a total of a preset number of moments before and after the moment as neighboring moments of each moment; For each moment, the temperature data of all neighboring positions of any position at each neighboring moment are combined into each row of the temperature array of the arbitrary position of the optical cable at each moment; for any position, the temperature data of all neighboring positions at each moment are combined into each column of the temperature array of the arbitrary position of the optical cable at each moment; The strain array at any position of the optical cable at each moment is obtained using the same acquisition method as that of the temperature array.

[0007] The determination of the abnormal sensitivity of the optical cable at each position of the optical cable at each moment is specifically as follows: Perform a straight line fit on all the data in the temperature array at each position of the optical cable at each moment to obtain the fitting slope; Comparing the deviation of each temperature data set at each position of the optical cable at each moment from the preset standard temperature to obtain an average temperature deviation; According to the difference between the temperature array at each moment and the previous moment, and the difference between the strain arrays at each position of the optical cable, a temperature change group array and a strain change array are obtained; The product of the straight-line fitting slope of the temperature array at each position of the optical cable at each moment and the average temperature deviation is calculated and recorded as the first product. The similarity between the temperature change array and the strain change array at each position of the optical cable at each moment is calculated, and negative correlation mapping is performed. The product is positively fused with the product to obtain the abnormal sensitivity of the optical cable at each position at each moment.

[0008] Before performing linear fitting on all data in the temperature array at each position of the optical cable at each moment, all data in the temperature array need to be sorted from small to large.

[0009] The average temperature deviation is specifically the average value of the absolute value of the difference between each data in the temperature array and the preset standard temperature.

[0010] The abnormal optical power gradient is obtained as follows: The sequence composed of all optical power data of the optical cable at each moment is recorded as optical power sequence; Obtaining a first-order difference sequence of the optical power sequence, and taking absolute values ​​of elements of the obtained first-order difference sequence to obtain an optical power amplitude gradient sequence; The local maximum value of the optical power amplitude gradient sequence is obtained as the abnormal optical power gradient.

[0011] The maximum value anomaly degree is specifically the extreme value of the elements in the sliding window centered on each local maximum value.

[0012] The process of obtaining the average deviation of the optical cable at each moment is specifically as follows: Calculate the deviation between the predicted optical power obtained at each position of the optical cable at each moment and the actual optical power value obtained; and take the average value of the deviations at all positions of the optical cable at each moment as the average deviation at each moment.

[0013] The specific steps of obtaining the abnormal operation degree of the optical cable at each moment are as follows: Calculate the average value of the abnormal sensitivity coefficient of the optical cable at all positions of the optical cable at each moment, and record it as the average sensitivity coefficient; Calculate the average value of the maximum anomaly of all optical power data of the optical cable at each moment, and record it as the average anomaly; The value of forward fusion of the average sensitivity coefficient, the average abnormality and the average deviation of the optical cable at each moment is used as the abnormal operation degree of the optical cable at each moment.

[0014] The fault point of the optical cable is specifically: An outlier algorithm is used to obtain abnormal outliers of the abnormal operation degree of the optical cable at all times, and the point with the maximum abnormal sensitivity of the optical cable at the time corresponding to the obtained abnormal outlier is taken as the fault point of the optical cable.

[0015] This application has at least the following beneficial effects: This application obtains the temperature, strain and optical power data during the operation of the OPGW optical cable. First, by analyzing the abnormal temperature changes when the optical cable is struck by lightning and the coordinated changes between temperature and strain, the optical cable abnormal sensitivity is constructed. The beneficial effect is that the optical cable abnormal sensitivity coefficient obtained based on the abnormal temperature rise of the optical cable when the optical cable is struck by lightning and the strain changes of the optical cable caused by thermal expansion and contraction can reflect the degree of influence of the lightning strike on the normal operation of the optical cable; secondly, based on the optical power changes caused by temperature and strain changes and the natural aging phenomenon of the optical cable and combined with the optical cable abnormal sensitivity, the optical cable abnormal operation degree is constructed. The beneficial effect is that the optical cable abnormal operation degree constructed by the present invention can accurately reflect the actual operation status of the optical cable at each detection moment by comprehensively analyzing the abnormal changes in temperature, strain and optical power data during the operation of the optical cable, thereby greatly improving the accuracy and reliability of optical cable fault identification, thereby ensuring the quality of fiber-optic broadband operation services. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A flow chart of a method for analyzing and detecting a state of a power communication optical cable provided in this application; Figure 2 Schematic diagram for obtaining the abnormal operation degree of the optical cable provided in this application. DETAILED DESCRIPTION

[0017] In the description of the embodiments of this application, words such as "exemplary," "or," and "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of this application should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary," "or," and "for example" is intended to present the relevant concepts in a concrete manner.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the art of this application. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0019] It should also be noted that the terms "first" and "second" in this application and its accompanying drawings are used to distinguish similar objects, rather than to describe a specific order or precedence. The methods disclosed in the embodiments of this application or the methods shown in the flowcharts include one or more steps for implementing the methods. Without departing from the scope of protection of this application, the order of execution of multiple steps can be interchanged with each other, and some steps can also be deleted.

[0020] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0021] This application proposes a state analysis and detection method for power communication optical cables, which is applied to the field of electric communication transmission technology. Figure 1 , the method comprises the following steps: Step 1: Obtain the temperature data, strain data, and optical power data of each position of the optical cable at each moment.

[0022] Optical fiber composite overhead ground wire (OPGW) cable is a common type of power communication cable. Since OPGW cables are installed at high altitudes, they are often struck by lightning. The impact of lightning strikes affects signal transmission, reducing the optical signal strength within the fiber. Lightning strikes also cause high temperatures on the surface of the OPGW cable and changes in cable stress. Failures in optical cable lines caused by lightning strikes can directly impact the quality of fiber-optic broadband services and the user experience.

[0023] Brillouin scattering occurs when light propagates in an optical fiber, and the Brillouin scattering of light in an optical fiber is sensitive to changes in temperature and strain. Therefore, this application uses a photodetector to receive and perform photoelectric conversion on the Brillouin scattered light, demodulates the frequency shift of the Brillouin scattering signal, and then obtains temperature data at various locations along the entire optical fiber. and strain data , and the Brillouin scattered light power is obtained The data of the change with distance, wherein the strain data refers to the degree of deformation of the optical fiber inside the cable when the cable is subjected to external force. In this application, the data collection time interval is set to 1 , this application sets the data sampling interval on the OPGW optical cable to .

[0024] There will inevitably be some noise interference in the data acquisition process, so the Gaussian filtering technology is used to remove the noise from the collected data. Norm normalization processing. Among them, Gaussian filter and Norm normalization is a well-known technology, and this application will not go into detail about its implementation process.

[0025] At this point, the temperature data of various locations during the operation of the pre-processed OPGW optical cable are obtained. , strain data And optical power data .

[0026] Step two: based on the temperature data and strain data of all positions in the neighborhood range at each time and a preset number of previous times, a temperature array and a strain array of each position of the optical cable at each time are constructed; the data trend characteristics and data distribution characteristics in the temperature array of each position of the optical cable at each time are analyzed, and the change similarity of the same position elements of the temperature data and strain array of adjacent times of each position of the optical cable is combined to determine the abnormal sensitivity of the optical cable at each time of each position of the optical cable.

[0027] Under the influence of global climate change, natural disasters such as lightning, rain and snow, and wind dance occur from time to time, which seriously affects the running state of the OPGW optical cable. And because the optical cable tower is built higher and closer to the cloud layer, and because the optical cable has the characteristics of smaller wire diameter, lower mechanical strength, and no load current under normal working conditions, the optical cable is easily struck by lightning in rainy weather, which brings great security risks to the normal operation of the optical cable. When the optical cable is struck by lightning, the local temperature of the optical cable will rise rapidly. This temperature change will cause the thermal expansion and contraction of the internal materials of the optical cable, thereby causing local strain of the optical cable. At the same time, the temperature and strain changes of the optical cable will cause changes in the performance parameters of the optical fiber, including but not limited to the refractive index, Poisson's ratio, and density of the optical fiber, thereby changing the propagation efficiency of the optical signal in the optical cable, which is specifically manifested as changes in the optical power data of the optical cable. Therefore, the actual running state of the optical cable is determined by collecting and analyzing the temperature, strain, and optical power data of the optical cable.

[0028] Lightning is a short and rapid temperature rise process, and because the OPGW optical cable has good heat conduction performance, the temperature of the lightning point quickly conducts to both sides, thereby presenting the phenomenon that the temperature of the lightning point is the highest, and the temperatures on both sides gradually decrease. Secondly, in the time sequence, the temperature of the lightning point presents a phenomenon that the temperature of the lightning point suddenly and rapidly increases, and slowly decreases with the passage of time. Secondly, due to thermal expansion and contraction, the temperature change of the optical cable will also cause the strain change of the optical cable. Therefore, based on the obtained temperature data and strain data of each point of the OPGW optical cable in the historical running process, a temperature array and a strain array are constructed, taking the temperature array and the strain array constructed at the i th position at the t th time as an example. In this embodiment, the size of the two-dimensional array is 17*17, the i th position is taken as the center, and the 17 positions before and after are taken as the neighborhood positions of the i th position; the t th time and the 17 times before are taken as the neighborhood times of the t th time, each row represents the temperature data and strain data of the 17 neighborhood positions before and after the i th position at each time, and each column represents the temperature data and strain data of each position at the t th time and the 17 neighborhood times before. Among them, for positions less than 17, the temperature data and strain data of the positions before and after the i th position are taken as the temperature data and strain data of the neighborhood positions of the i th position.​​​​ The data points of the array are filled using a method of polynomial interpolation. Polynomial interpolation is a well-known technique, and the implementation process thereof will not be described in detail herein.

[0029] Therefore, the present application first fills the temperature array based on the temperature array based on the temperature array based on the temperature array based on the temperature array based on the temperature array based on the temperature array based on the temperature array based on the temperature array based on the temperature array

[0030] In addition, considering that after a period of time after the lightning phenomenon, the temperatures between the points of the temperature array are all abnormal temperatures caused by the lightning phenomenon, the linear slope obtained by linear fitting is small at this time, therefore the present application further calculates the average value of the absolute value of the difference between the temperature of each point in the temperature array and the standard temperature, denoted as the average temperature deviation , wherein the standard temperature is taken as The greater the average temperature deviation , the more serious the abnormal change in the temperature of the optical cable caused by the lightning phenomenon, that is, the more serious the damage to the optical cable caused by the lightning phenomenon.

[0031] Furthermore, thermal expansion and contraction are important reasons for changes in the strain of optical cables. Under normal circumstances, the temperature changes of OPGW optical cables are mainly caused by temperature changes in the four seasons and the temperature difference between day and night. At this time, the overall temperature change of the optical cable is relatively small, and the strain change caused by thermal expansion and contraction is also small. At this time, since the optical cable material has a certain elasticity, as the temperature returns to normal, the strain of the optical cable will usually be restored to a certain extent. However, when the optical cable is struck by lightning, the large amount of heat generated by the lightning strike causes the optical cable to heat up rapidly. At this time, due to thermal expansion and contraction, the strain of the optical cable will also increase rapidly; the strain of the optical cable is constrained by the optical cable material. When the temperature change of the optical cable is large, the optical cable will undergo plastic deformation, which will affect the strain recovery ability of the optical cable. That is, when the optical cable is struck by lightning, the greater the lightning strike intensity, the greater the temperature change of the optical cable. At this time, the more serious the damage to the optical cable, the more difficult it is to recover the strain caused by the lightning strike on the optical cable. Therefore, this application further analyzes the synergistic relationship between temperature and strain when the optical cable is struck by lightning.

[0032] Specifically, since the surface temperature of the optical cable is not zero when the optical cable is in normal working condition, and strain is usually generated due to temperature changes; therefore, this application calculates Moment and Temperature array corresponding to the time and strain array The change in the elements at the same position gives the temperature change array and the strain change array , and calculate and Spearman correlation coefficient between , Spearman correlation coefficient The Spearman correlation coefficient indicates the coordinated change relationship between the temperature and strain of the optical cable when it is struck by lightning. The smaller the value, the more difficult it is to recover the shape of the optical cable after it is struck by lightning. This is a well-known technology, and this application will not go into detail about its implementation process.

[0033] The product of the straight-line fitting slope of the temperature array at each position of the optical cable at each moment and the average temperature deviation is calculated and recorded as the first product. The similarity between the temperature change array and the strain change array at each position of the optical cable at each moment is calculated, and negative correlation mapping is performed. The product is positively fused with the product to obtain the abnormal sensitivity of the optical cable at each position at each moment.

[0034] In this embodiment, the optical cable Locations in The abnormal sensitivity coefficient of the optical cable at the time is recorded as , its formula form is: Where, Indicates OPGW optical cable Locations in The slope of the straight line fitting of the temperature array at the moment; Indicates the optical cable Locations in The average temperature deviation of the temperature array at the moment; Indicates the optical cable Locations in The Spearman correlation coefficient between the temperature change array and the strain change array at each moment; is the parameter adjustment factor, in order to prevent the denominator from being 0, The value is 0.01; implementers can set it according to actual conditions.

[0035] It should be understood that when the OPGW cable Locations in When struck by lightning, the temperature array Calculated straight line fit slope The larger the temperature, the higher the temperature of the optical cable. Calculated average temperature deviation The larger the value, the smaller the Pearson correlation coefficient between the temperature change array and the strain change array. Reduce; Optical cable Locations in Abnormal sensitivity coefficient of optical cable at time The larger the value, the greater the impact of lightning strike on the normal operation of the optical cable.

[0036] Step 3: Analyze the volatility of the change trend of the optical power data of the optical cable at each moment to obtain the abnormal optical power gradient; preset a sliding window, analyze the volatility of the data in the sliding window, and obtain the maximum abnormality; predict the optical power of each position of the optical cable at each moment based on the historical optical power data, and compare it with the actual collected optical power data to obtain the average deviation of the optical cable at each moment; based on the distribution of the maximum abnormality corresponding to all abnormal power gradients of the optical cable at each moment, combined with the abnormal sensitivity of the optical cable at all positions at each moment and the average deviation, obtain the abnormal operation degree of the optical cable at each moment.

[0037] Furthermore, when an OPGW cable is struck by lightning, the optical fibers within the cable are subjected to both temperature and strain changes, causing abnormal changes in the fiber's refractive index. Specifically, the refractive index near the lightning strike point no longer remains uniform and stable, and this refractive index change can affect the normal propagation of light within the fiber. Specifically, this abnormal change in refractive index causes optical signal attenuation, reducing the optical power collected at the receiving end. Therefore, this application further analyzes optical power changes caused by temperature and strain.

[0038] Specifically, when the optical cable is operating normally, the Brillouin scattered light power data collected by the photodetector shows a trend of gradually decreasing with the increase of the optical fiber propagation distance. This is because the optical power in the optical fiber continues to decay with the increase of the propagation distance, and the variation amplitude between the optical power data at adjacent positions is usually small, indicating that the power attenuation is smooth and continuous, and is not affected by significant external disturbances or abnormal factors. However, when the optical cable is struck by lightning, the collected optical power data shows obvious amplitude changes at the lightning strike point. Therefore, this application performs first-order difference processing on the collected optical power data to obtain an optical power amplitude gradient sequence. Among them, the first-order difference technology is a well-known technology, and this application will not elaborate on its implementation details. Secondly, due to the calculated optical power amplitude gradient sequence There may be negative values ​​in the optical power amplitude gradient sequence. Take the absolute value of all elements in .

[0039] Optical power amplitude gradient sequence Automatic multi-scale peak search algorithm is used to obtain the optical power amplitude gradient sequence The local maximum value is recorded as the abnormal optical power gradient, and then a sliding window of preset length is constructed with the location of the local maximum value as the center. In this embodiment, the window length is 9; the implementer can adjust it according to the actual situation. The extreme difference value of the data in each local maximum sliding window is recorded as the maximum value abnormality degree. The greater the maximum value anomaly, the greater the abnormality of the optical power data at the location of the lightning strike point in the optical power data.

[0040] Considering the phenomenon of optical power reduction during optical cable signal transmission caused by aging of OPGW optical cables, this application uses data prediction to evaluate the abnormal changes in optical power caused by lightning strikes by the deviation between the predicted value and the actual value at each moment. All optical power data collected before each moment at each location are used as the input of the EMA prediction algorithm to predict the The optical power data of the first position is obtained The deviation between the predicted result and the actual value of each position at each moment When the optical cable is not struck by lightning, The deviation between the predicted result and the true value When the optical cable is struck by lightning, the temperature and strain of the optical cable will change, which will lead to the The deviation between the predicted result and the true value The smoothing factor in the EMA prediction algorithm is set to 0.9, and the EMA prediction algorithm is a well-known technology, and this application will not elaborate on its implementation process in detail; the deviation is determined by the absolute value of the difference between the variables.

[0041] The average value of the abnormal sensitivity coefficient of the optical cable at all locations on the optical cable at each moment is calculated, recorded as the average sensitivity coefficient; the average value of the maximum abnormality degree of all optical power data of the optical cable at each moment is calculated, recorded as the average abnormality degree; the average value of the predicted deviation corresponding to all locations on the optical cable at each moment is calculated, recorded as the average deviation; the value of the average sensitivity coefficient, the average abnormality degree, and the average deviation of the optical cable at each moment is forward fused to obtain the value of the abnormal operation degree of the optical cable at each moment. In this embodiment, multiple variables are forward fused using a multiplication calculation method.

[0042] Among them, the schematic diagram of obtaining the abnormal operation degree of the optical cable is as follows: Figure 2 shown.

[0043] It should be understood that when the OPGW optical cable is struck by lightning, firstly, the lightning strike will cause the surface temperature and strain of the optical cable to change, and then the calculated average optical cable abnormal sensitivity coefficient will increase; secondly, the temperature change and strain change of the optical cable will cause the optical power data in the optical cable to change abnormally, so that the average abnormality of the maximum value in the optical power data increases; in addition, the application takes into account the natural aging phenomenon of the optical cable and evaluates the operating status of the optical cable by comparing the deviation between the predicted value and the actual value. Therefore, when the optical cable is struck by lightning, the average deviation between the optical power of each position collected by the optical cable at each moment and the predicted value increases; thereby making the final calculated optical cable to be tested The greater the abnormal operation degree of the optical cable at that time.

[0044] Step 4: Perform outlier detection on the abnormal operation degree of the optical cable at all times, and obtain the fault point of the optical cable in combination with the numerical distribution of the abnormal sensitivity of the optical cable.

[0045] The abnormal operation degree of the optical cable comprehensively considers the abnormal changes in temperature, strain and optical power when the optical cable is struck by lightning during operation. Therefore, the abnormal operation degree of the optical cable can accurately reflect the actual operating status of the optical cable at each detection moment.

[0046] Specifically, the data set consisting of the abnormal operation degree of the optical cable obtained at each moment during the operation of the OPGW optical cable is recorded as Under normal circumstances, the data set The difference between the data in the data set is small, and the data distribution is relatively concentrated. However, when the OPGW optical cable is struck by lightning, the abnormal operation degree of the optical cable near the lightning strike point will increase abnormally and appear as abnormal data, thereby causing the abnormal operation degree of the optical cable near the lightning strike point to deviate from the data set. Therefore, this application uses the data set As input, the local outlier factor (LOF) algorithm is used to detect the data set Outliers, this application sets the number of nearest neighbor distances Set the empirical value to 8. The point with the highest sensitivity to optical cable anomalies at the time corresponding to the detected outlier is considered the fault point caused by the lightning strike. Repair the OPGW optical cable promptly based on the detected fault point to ensure the quality of fiber-optic broadband service.

[0047] The flowcharts and block diagrams in the accompanying drawings show the possible architecture, functions and operations of the systems, methods and computer program products according to the embodiments of the present application. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of the code, and the part of the module, program segment or code contains one or more executable instructions for realizing the specified logical function. In some alternative implementations, the functions marked in the box can also occur in an order different from that marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, which can depend on the functions involved. In the description corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different boxes can also occur in an order different from that disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, which can depend on the functions involved. Each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, may be implemented by a dedicated hardware-based system that performs the specified function or action, or may be implemented by a combination of dedicated hardware and computer instructions.

[0048] The above examples are only used to illustrate the technical solutions of the present application, but not limit the same; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can be modified, or some technical features can be replaced by equivalent ones; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A method for analyzing and detecting the status of a power communication optical cable, characterized in that: The method comprises the following steps: Obtain temperature data, strain data, and optical power data at each position of the optical cable at each moment; Taking any position of the optical cable as the center, a temperature array and a strain array of any position of the optical cable at each moment are constructed based on the temperature and strain data of all positions within the neighborhood at each moment and a preset number of moments before. The data trend characteristics and data distribution characteristics in the temperature array of each position of the optical cable at each moment are analyzed. Combined with the similarity of the changes of the temperature data of each position of the optical cable at adjacent moments and the elements of the strain array at the same position, the abnormal sensitivity of the optical cable at each position of the optical cable at each moment is determined. Analyze the volatility of the change trend of the optical power data of the optical cable at each moment to obtain the abnormal optical power gradient; preset a sliding window, analyze the volatility of the data within the sliding window, and obtain the maximum value abnormality; predict the optical power of each position of the optical cable at each moment based on the historical optical power data, and compare it with the actual collected optical power data to obtain the average deviation of the optical cable at each moment; based on the distribution of the maximum value abnormality corresponding to all abnormal power gradients of the optical cable at each moment, combined with the abnormal sensitivity of the optical cable at all positions at each moment and the average deviation, obtain the abnormal operation degree of the optical cable at each moment; Outlier detection is performed on the abnormal operation degree of the optical cable at all times, and the fault point of the optical cable is obtained by combining the numerical distribution of the abnormal sensitivity of the optical cable.

2. The state analysis and detection method of a power communication optical cable according to claim 1, characterized in that: The temperature array and strain array of any position of the optical cable at each moment are specifically: Taking any position as the center, a total of a preset number of positions before and after the position are used as neighboring positions of the position; taking each moment and a total of a preset number of moments before and after the moment as neighboring moments of each moment; For each moment, the temperature data of all neighboring positions of any position at each neighboring moment are combined into each row of the temperature array of the arbitrary position of the optical cable at each moment; for any position, the temperature data of all neighboring positions at each moment are combined into each column of the temperature array of the arbitrary position of the optical cable at each moment; The strain array at any position of the optical cable at each moment is obtained using the same acquisition method as that of the temperature array.

3. The state analysis and detection method of a power communication optical cable according to claim 1, characterized in that: The determination of the abnormal sensitivity of the optical cable at each position of the optical cable at each moment is specifically as follows: Perform a straight line fit on all the data in the temperature array at each position of the optical cable at each moment to obtain the fitting slope; Comparing the deviation of each temperature data set at each position of the optical cable at each moment from the preset standard temperature to obtain an average temperature deviation; According to the difference between the temperature array at each moment and the previous moment, and the difference between the strain arrays at each position of the optical cable, a temperature change group array and a strain change array are obtained; Calculate the product of the straight-line fitting slope of the temperature array at each position of the optical cable at each moment and the average temperature deviation, and record it as the first product; The similarity between the temperature change array and the strain change array at each position of the optical cable at each moment is calculated, and negative correlation mapping is performed, and positive fusion is performed with the product to obtain the abnormal sensitivity of the optical cable at each position at each moment.

4. A method for analyzing and detecting the state of a power communication optical cable according to claim 3, characterized in that: Before performing linear fitting on all data in the temperature array at each position of the optical cable at each moment, all data in the temperature array need to be sorted from small to large.

5. The state analysis and detection method of a power communication optical cable according to claim 3, characterized in that: The average temperature deviation is specifically the average value of the absolute value of the difference between each data in the temperature array and the preset standard temperature.

6. The method for analyzing and detecting the state of a power communication optical cable according to claim 1, wherein: The abnormal optical power gradient is obtained as follows: The sequence composed of all optical power data of the optical cable at each moment is recorded as optical power sequence; Obtaining a first-order difference sequence of the optical power sequence, and taking absolute values ​​of elements of the obtained first-order difference sequence to obtain an optical power amplitude gradient sequence; The local maximum value of the optical power amplitude gradient sequence is obtained as the abnormal optical power gradient.

7. The method for analyzing and detecting the state of a power communication optical cable according to claim 1, wherein: The maximum value anomaly degree is specifically the range value of the elements in the sliding window centered on each local maximum value.

8. The method for analyzing and detecting the state of a power communication optical cable according to claim 1, wherein: The process of obtaining the average deviation of the optical cable at each moment is specifically as follows: Calculate the deviation between the predicted optical power obtained at each position of the optical cable at each moment and the actual optical power value obtained; and take the average value of the deviations at all positions of the optical cable at each moment as the average deviation at each moment.

9. The method for analyzing and detecting the state of a power communication optical cable according to claim 1, wherein: The specific steps of obtaining the abnormal operation degree of the optical cable at each moment are as follows: Calculate the average value of the abnormal sensitivity coefficient of the optical cable at all positions of the optical cable at each moment, and record it as the average sensitivity coefficient; Calculate the average value of the maximum anomaly of all optical power data of the optical cable at each moment, and record it as the average anomaly; The value of forward fusion of the average sensitivity coefficient, the average abnormality and the average deviation of the optical cable at each moment is used as the abnormal operation degree of the optical cable at each moment.

10. The method for analyzing and detecting the state of a power communication optical cable according to claim 1, wherein: The fault point of the optical cable is specifically: An outlier algorithm is used to obtain abnormal outliers of the abnormal operation degree of the optical cable at all times, and the point with the maximum abnormal sensitivity of the optical cable at the time corresponding to the obtained abnormal outlier is taken as the fault point of the optical cable.

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