A Fault Monitoring System for Power Transmission Equipment Based on Fiber Optic Sensors

Abstract

The present invention relates to the technical field of cable monitoring, and specifically discloses a fault monitoring system for power transmission equipment based on an optical fiber sensor. The data acquisition module includes a cable data acquisition unit and an optical fiber data acquisition unit. The cable data acquisition unit is used to collect data information of the power transmission cable. The temperature correction and evaluation module corrects the temperature data of the cable monitored by the temperature measurement optical fiber by combining the data collected by the data acquisition module. Based on diversified data as support, the reliability and accuracy of the temperature monitoring data can be improved, thereby improving the accuracy of the preliminary judgment of the operating state of the cable. Then, the data processing module calculates the real-time operating state risk coefficient of the power transmission cable by combining the data of the temperature correction module and the data monitored by the operating state monitoring module, and can further analyze the operating state of the transmission cable, thereby improving the accuracy and reliability of the cable fault monitoring results.

Description

Technical Field

[0001] The present invention relates to the technical field of cable monitoring, and specifically to a fault monitoring system for power transmission equipment based on optical fiber sensors. Background Art

[0002] Power transmission equipment refers to a series of systems and devices for transmitting electric energy, whose main purpose is to transmit the electric energy generated by power stations or power sources from the starting point to end users or other electrical equipment. Among them, as a conductor for transmitting electric energy and signals, the importance of cables is self-evident. Therefore, it is very necessary to monitor cable faults.

[0003] Currently, the common cable fault monitoring system monitors in real time through the temperature measurement optical fiber in the optical fiber sensor. During the process of laying cables, the temperature measurement optical fiber will be closely attached to the surface of the transmission cable. When the cable temperature changes, the light in the optical fiber will change in light intensity due to the influence of temperature. This change will be captured by the data acquisition and analysis system, and converted into temperature data information, and the operating state of the cable and whether there are faults will be judged based on the temperature data information.

[0004] In the prior art, for cable fault monitoring, usually the temperature of the cable is measured according to the change in the light intensity of the temperature measurement optical fiber itself. However, the temperature released by the cable may deviate due to different factors. At this time, the change in the light intensity of the temperature measurement optical fiber cannot truly reflect the actual temperature of the cable, resulting in deviations in cable fault monitoring. And monitoring cable faults solely based on the temperature of the cable has low sensitivity, which will also lead to large deviations in cable fault monitoring results. Summary of the Invention

[0005] The purpose of the present invention is to provide a fault monitoring system for power transmission equipment based on optical fiber sensors, and solve the following technical problems:

[0006] How to improve the accuracy and reliability of cable fault monitoring results.

[0007] The purpose of the present invention can be achieved through the following technical solutions:

[0008] A fault monitoring system for power transmission equipment based on optical fiber sensors, the system includes:

[0009] A data acquisition module, including a cable data acquisition unit and an optical fiber data acquisition unit, the cable data acquisition unit is used to acquire data information of the power transmission cable;

[0010] The optical fiber data acquisition unit is used to acquire the optical fiber material data of the temperature measurement optical fiber;

[0011] The area division module is used to divide the optical cable into multiple monitoring areas with the same length according to the length of the optical cable;

[0012] The operating status monitoring module is used to collect the status data of the power transmission cable during operation;

[0013] The temperature correction and evaluation module is used to correct the temperature data of the cable monitored by the temperature measurement optical fiber in combination with the data collected by the data collection module, and make a preliminary evaluation of the operating status of the cable by analyzing the corrected temperature;

[0014] The data processing module is used to calculate the real-time operating status risk coefficient of the power transmission cable by combining the data of the temperature correction module and the data monitored by the operating status monitoring module;

[0015] The data analysis module is used to compare the real-time operating status risk coefficient of the power transmission cable with the preset operating status risk coefficient, and analyze the operating status of the cable according to the comparison result.

[0016] Furthermore, the data information of the power transmission cable includes the thickness of the cable insulation layer and the pressure on the cable in different areas, and the optical fiber material data of the temperature measurement optical fiber includes the core diameter, the bending degree in different areas, and the optical fiber material.

[0017] Furthermore, the correction process of the temperature correction and evaluation module includes:

[0018] Obtain the temperature deviation coefficient γ of the power transmission cable in the i-th area during a single data collection through the formula ; i ;

[0019] And obtain the corrected temperature of the power transmission cable in the i-th area during a single data collection through the formula ;

[0020] where i is any area divided by the area division module, zj is the core diameter of the temperature measurement optical fiber, zj y and the preset core diameter, wq i is the bending degree of the temperature measurement optical fiber in the i-th area during a single data collection, wq y is the preset bending degree, σ is the influence coefficient of the optical fiber material of the temperature measurement optical fiber, which is set according to empirical fitting, hd is the outer layer thickness of the power transmission cable, hd y is the preset outer layer thickness, hd b is the standard value of hd, f q (x) is a defined function. When (x) ≥ 1, let f q (x) = (x), otherwise, let f q(x) = 1, ρ is the influence coefficient of the material for making the power transmission cable, which is set by empirical fitting, wd y is the preset outdoor temperature, wd is the outdoor temperature in the first data collection, x1 and x2 are weight coefficients, Q is the first proportional coefficient, which is set by empirical fitting, and ω is the original temperature magnitude monitored in the first data collection.

[0021] Furthermore, the correction process of the temperature correction evaluation module further includes:

[0022] By comparing the corrected temperatures of the power transmission cables in all regions with the preset cable temperature threshold respectively;

[0023] If any is greater than The system determines that the temperature of the power transmission cable in this region is abnormal, and there may be a cable damage situation, and promptly issues a warning to the background management personnel;

[0024] If all are less than The system determines that the temperatures of the power transmission cables in all regions are normal, there is no cable damage situation, and further analysis is carried out in combination with the data of the operation status monitoring module.

[0025] Furthermore, the data monitored by the operation status monitoring module includes the magnitude of the current value, the magnitude of the resistance, and the magnitude of the voltage during the operation of the cable.

[0026] Furthermore, the processing process of the data processing module includes:

[0027] By using the formula calculate the dispersion coefficient r of the cable temperatures in all regions;

[0028] Among them, n is the total number of regions divided by the region division module, is the average value of all , g is the second proportional coefficient, which is set by empirical fitting, is all the maximum value in.

[0029] Furthermore, the processing process of the data processing module further includes:

[0030] By using the formula calculate the operation risk coefficient δ of the power transmission cable in the i-th region at the a-th time point ai ;

[0031] Among them, a is a data monitoring at a fixed time interval, yl aiThe pressure on the power transmission cable in the i-th area at the a-th time point, yl y The preset pressure on the cable, dl ai The magnitude of the current in the power transmission cable in the i-th area at the a-th time point, dl y The preset magnitude of the current, dz ai The resistance of the power transmission cable in the i-th area at the a-th time point, dz y The preset resistance, dy ai The magnitude of the voltage of the power transmission cable in the i-th area at the a-th time point, For all dy ai The average value of, dy b For dy ai The standard value of.

[0032] Furthermore, the analysis process of the data analysis module includes:

[0033] By comparing the operation risk coefficient δ of the power transmission cables in all areas at the a-th time point ai with the preset risk coefficient threshold δ z for comparison;

[0034] If all δ ai are less than δ z , the system determines that the operation risk coefficient of the overall power transmission cable at the a-th time point is small, and the overall operation state of the cable is stable, without any faults or abnormal operation conditions;

[0035] If any δ ai is greater than δ z , the system determines that the operation risk coefficient of the power transmission cable in this area at the a-th time point is too large, and the overall operation state of the cable is unstable. Further, it is determined that the electronic transmission cable in this area may be damaged or abnormal, and a warning is given in a timely manner to remind the background management personnel to carry out maintenance.

[0036] The beneficial effects of the present invention:

[0037] (1) By combining the temperature correction evaluation module with the data collected by the data acquisition module, the present invention corrects the temperature data of the cable monitored by the temperature measurement optical fiber. Based on diversified data as support, the reliability and accuracy of the temperature monitoring data can be improved, thereby improving the accuracy of the preliminary judgment of the operation state of the cable. Subsequently, through the data processing module, combining the data of the temperature correction module and the data monitored by the operation state monitoring module, the real-time operation state risk coefficient of the power transmission cable is calculated, which can further analyze the operation state of the transmission cable, thereby improving the accuracy and reliability of the cable fault monitoring results.

[0038] (2) After combining the information data of the temperature-measuring optical fiber and the transmission cable, the present invention can accurately calculate the temperature deviation coefficient of the power transmission cable in the i-th area during the primary data acquisition. This data can reflect the deviation between the cable temperature monitored by the temperature-measuring optical fiber and the actual cable temperature. And based on this data, the corrected temperature of the power transmission cable in the i-th area is calculated, which can make the obtained temperature data more in line with the actual data, thereby improving the reliability and accuracy of the temperature data, and thus avoiding large deviations in subsequent cable fault monitoring and ensuring the accuracy of the detection results.

[0039] (3) By the present invention, the corrected temperatures of the power transmission cables in all areas are respectively compared with the preset cable temperature thresholds to accurately judge whether the cable is damaged according to the temperature of the power transmission cable, and make a decision based on the judgment result whether to issue a warning to the background management personnel or conduct further analysis in combination with the data of the operation status monitoring module, thereby improving the accuracy and reliability of the cable fault monitoring results. And since this analysis method analyzes the cable status in different areas, when it is judged that the cable may be damaged, rapid positioning can be achieved, thereby improving the maintenance efficiency.

[0040] (4) By combining the status data of the cable during operation, the temperature deviation coefficient γ of the power transmission cable in the i-th area during the primary data acquisition i and the dispersion coefficient r of the cable temperatures in all areas and other diversified data, the accuracy and reliability of the calculation result of the operation risk coefficient of the power transmission cable in the i-th area at the a-th time point can be improved, thereby providing accurate and strong data support for subsequent judgment of the cable operation status and improving the accuracy of the monitoring results.

[0041] (5) By comparing the operation risk coefficients δ of the power transmission cables in all areas at the a-th time point ai with the preset risk coefficient threshold δ z Since the data used for analysis and comparison has high accuracy and reliability, accurate judgment can be made on the level of the operation risk coefficients of each area of the power transmission cable at the a-th time point according to the comparison result, thereby judging the stability of the overall operation status of the cable. And when it is judged that the electronic transmission cable in this area may be damaged or abnormal, a warning is issued in a timely manner, thereby improving the maintenance efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The present invention will be further described below with reference to the accompanying drawings.

[0043] Figure 1It is a schematic block diagram of a power transmission equipment fault monitoring system based on an optical fiber sensor in the present invention. Detailed implementation manners

[0044] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0045] Please refer to Figure 1 As shown, in one embodiment, the present application provides a power transmission equipment fault monitoring system based on an optical fiber sensor. The system includes:

[0046] A data acquisition module, including a cable data acquisition unit and an optical fiber data acquisition unit. The cable data acquisition unit is used to acquire data information of the power transmission cable.

[0047] The optical fiber data acquisition unit is used to acquire the optical fiber material data of the temperature measurement optical fiber.

[0048] A region division module, used to divide the optical cable into multiple monitoring regions with the same length according to the length of the optical cable.

[0049] An operating state monitoring module, used to acquire the state data of the power transmission cable during operation.

[0050] A temperature correction and evaluation module, used to correct the temperature data of the cable monitored by the temperature measurement optical fiber in combination with the data acquired by the data acquisition module, and analyze the corrected temperature to make a preliminary evaluation of the operating state of the cable.

[0051] A data processing module, used to calculate the real-time operating state risk coefficient of the power transmission cable in combination with the data of the temperature correction module and the data monitored by the operating state monitoring module.

[0052] A data analysis module, used to compare the real-time operating state risk coefficient of the power transmission cable with a preset operating state risk coefficient, and analyze the operating state of the cable according to the comparison result.

[0053] Through the above technical solution, this embodiment provides a data acquisition module to collect the data information of the power transmission cable and the fiber material data of the temperature measurement optical fiber, and through a region division module, according to the length of the optical cable, it is divided into multiple monitoring regions with the same length. Subsequently, the temperature correction and evaluation module can correct the temperature data of the cable monitored by the temperature measurement optical fiber by combining the data collected by the data acquisition module, and analyze the corrected temperature to make a preliminary evaluation of the operating state of the cable. When it is determined that the temperature of the current cable is relatively stable, first, the operating state monitoring module collects the state data of the power transmission cable during operation, and then the data processing module combines the data of the temperature correction module and the data monitored by the operating state monitoring module to calculate the real-time operating state risk coefficient of the power transmission cable, and the data analysis module compares the real-time operating state risk coefficient of the power transmission cable with the preset operating state risk coefficient, and analyzes the operating state of the cable according to the comparison result;

[0054] By setting like this, the system first corrects the temperature data of the cable monitored by the temperature measurement optical fiber through the temperature correction and evaluation module in combination with the data collected by the data acquisition module. Based on diversified data as support, the reliability and accuracy of the temperature monitoring data can be improved, thereby improving the accuracy of the preliminary judgment of the operating state of the cable. Then, the data processing module combines the data of the temperature correction module and the data monitored by the operating state monitoring module to calculate the real-time operating state risk coefficient of the power transmission cable, which can further analyze the operating state of the transmission cable, thereby improving the accuracy and reliability of the cable fault monitoring results.

[0055] The data information of the power transmission cable includes the thickness of the cable insulation layer and the pressure on the cable in different regions. The fiber material data of the temperature measurement optical fiber includes the core diameter, the degree of bending in different regions, and the optical fiber material;

[0056] Through the above technical solution, this embodiment provides the data information of the power transmission cable and the fiber material data of the temperature measurement optical fiber. This data reflects the physical characteristics of the transmission cable and the temperature measurement optical fiber, and this physical characteristic affects the conduction of temperature. Therefore, the temperature correction and evaluation module can correct the temperature data of the cable by combining this data, making the monitored cable temperature data closer to the true value, thereby improving the accuracy of the subsequent preliminary judgment of the operating state of the cable.

[0057] The correction process of the temperature correction and evaluation module includes:

[0058] Through the formula Calculate the temperature deviation coefficient γ of the power transmission cable in the i-th region during a single data acquisition i ;

[0059] and through the formula calculate the corrected temperature of the power transmission cable in the i-th area during a single data acquisition

[0060] wherein, i is any area divided by the area division module, zj is the core diameter of the temperature-measuring optical fiber, zj y and the preset core diameter, wq i is the bending degree of the temperature-measuring optical fiber in the i-th area during a single data acquisition, wq y is the preset bending degree, σ is the influence coefficient of the temperature-measuring optical fiber manufacturing material, which is set by empirical fitting, hd is the outer layer thickness of the power transmission cable, hd y is the preset outer layer thickness, hd b is the standard value of hd, and the above standard value can be set according to the allowable error in the empirical data, f q (x) is a defined function. When (x) ≥ 1, let f q (x) = (x), otherwise, let f q (x) = 1, ρ is the influence coefficient of the power transmission cable manufacturing material, which is set by empirical fitting, wd y is the preset outdoor temperature, wd is the outdoor temperature during a single data acquisition, x1 and x2 are weight coefficients, which are set by empirical fitting, Q is the first proportional coefficient, which is set by empirical fitting, and ω is the magnitude of the original temperature monitored during a single data acquisition;

[0061] Through the above technical solution, this embodiment provides the temperature deviation coefficient γ of the power transmission cable in the i-th area during a single data acquisition i , which can be calculated through the formula Obviously, when the core diameter of the temperature-measuring optical fiber and the outer layer thickness of the cable are larger, and the bending degree and temperature of the temperature-measuring optical fiber in the i-th area are higher, then the temperature deviation coefficient of the power transmission cable in the i-th area during a single data acquisition is larger, indicating that the temperature data collected in this case has a large deviation. On the contrary, when the core diameter of the temperature-measuring optical fiber and the outer layer thickness of the cable are smaller, and the bending degree and temperature of the temperature-measuring optical fiber in the i-th area are lower, then the temperature deviation coefficient of the power transmission cable in the i-th area during a single data acquisition is smaller, indicating that the temperature data collected in this case has a smaller deviation;

[0062] And this embodiment provides the corrected temperature of the power transmission cable in the i-th area during a single data acquisition which can be calculated through the formula By this calculation method, in combination with the temperature deviation coefficient γ of the power transmission cable in the i-th area during a single data acquisition i, the corrected temperature can be calculated to make the temperature closer to the actual situation, thus providing accurate data support for subsequent determination of whether there is an abnormal state of the cable.

[0063] By setting it in this way, after combining the information data of the temperature measurement optical fiber and the transmission cable, the temperature deviation coefficient of the power transmission cable in the i-th area during the first data acquisition can be accurately calculated. This data can reflect the deviation between the cable temperature monitored by the temperature measurement optical fiber and the actual temperature of the cable. And based on this data, the corrected temperature of the power transmission cable in the i-th area can be calculated, which can make the obtained temperature data more in line with the actual data, thus improving the reliability and accuracy of the temperature data, and avoiding large deviations in subsequent cable fault monitoring, ensuring the accuracy of the detection results.

[0064] The correction process of the temperature correction and evaluation module further includes:

[0065] By comparing the corrected temperatures of the power transmission cables in all areas with the preset cable temperature threshold respectively;

[0066] If any is greater than the system determines that the temperature of the power transmission cable in this area is abnormal, and there may be a situation of cable damage, and issues a warning to the background management personnel in a timely manner;

[0067] If all are less than the system determines that the temperatures of the power transmission cables in all areas are normal, and there is no situation of cable damage, and further analysis is carried out in combination with the data of the operation status monitoring module;

[0068] Through the above technical solution, in this embodiment, by comparing the corrected temperatures of the power transmission cables in all areas with the preset cable temperature threshold respectively, an accurate judgment is made on whether the cable is damaged according to the temperature of the power transmission cable, and according to the judgment result, a decision is made to issue a warning to the background management personnel or to further analyze in combination with the data of the operation status monitoring module, thus improving the accuracy and reliability of the cable fault monitoring results. And since this analysis method analyzes the cable status in different areas, it can achieve quick positioning when it is determined that the cable may be damaged, thus improving the maintenance efficiency;

[0069] It should be noted that the above preset cable temperature threshold can be set by fitting according to empirical data.

[0070] The data monitored by the operating status monitoring module includes the magnitude of the current value, the magnitude of the resistance, and the magnitude of the voltage of the cable during operation;

[0071] Through the above technical solution, this embodiment provides the data monitored by the operating status monitoring module. This data reflects the status of the cable during operation. By combining the data in this dimension, the sensitivity of subsequent cable fault monitoring can be improved, thereby improving the accuracy of the monitoring results.

[0072] The processing process of the data processing module includes:

[0073] Through the formula Calculate the discrete coefficient r of the cable temperature in all regions;

[0074] where n is the total number of regions divided by the region division module, is the average value of all g is the second proportionality coefficient, which is set by empirical fitting, is all the maximum value in;

[0075] Through the above technical solution, this embodiment provides the discrete coefficient r of the cable temperature in all regions, which can be calculated through the formula By this calculation method, the temperature distribution of the entire cable can be judged. When the discrete coefficient r of the cable temperature in all regions is low, it indicates that the temperature difference in each region of the entire cable is small, indicating that the usage conditions in each region of the cable are roughly the same, and there is no abnormality or cable damage in a certain region. When the discrete coefficient r of the cable temperature in a region is high, it indicates that the temperature difference in each region of the entire cable is large, which means that the usage conditions in each region of the cable are different, and there may be some regions with imperceptible abnormalities or small damages. By setting it like this, it shows that the discrete coefficient of the cable temperature in all regions is closely related to the abnormality or damage of the cable. Therefore, this data can provide data support for subsequent judgment of the risk level of the cable operating status, thereby improving the accuracy and reliability of the cable fault monitoring results.

[0076] The processing process of the data processing module further includes:

[0077] Through the formula Calculate the operating risk coefficient δ of the power transmission cable in the i-th region at the a-th time point ai ;

[0078] where a is a data monitoring at a fixed time interval, yl ai is the pressure received by the power transmission cable in the i-th region at the a-th time point, yl yis the pressure on the preset cable, dl ai is the current magnitude of the power transmission cable in the i-th region at the a-th time point, dl y is the preset current magnitude, dz ai is the resistance of the power transmission cable in the i-th region at the a-th time point, dz y is the preset resistance, dy ai is the voltage magnitude of the power transmission cable in the i-th region at the a-th time point is all dy ai average value of, dy b is dy ai standard value of, the above standard value can be selected and set according to the allowable error in the empirical data;

[0079] Through the above technical solution, this embodiment provides the operation risk coefficient δ of the power transmission cable in the i-th region at the a-th time point ai , which can be obtained by the formula calculated, where can calculate the voltage fluctuation value of all regions of the power transmission cable at the a-th time point. Therefore, it can be seen that when the pressure on the power transmission cable in the i-th region at the a-th time point is greater, and the current, resistance, and voltage fluctuation value of all regions of the power transmission cable at the a-th time point are higher, then the operation risk of the power transmission cable in the i-th region at the a-th time point is greater. On the contrary, when the pressure on the power transmission cable in the i-th region at the a-th time point is smaller, and the current, resistance, and voltage fluctuation value of all regions of the power transmission cable at the a-th time point are lower, then the operation risk of the power transmission cable in the i-th region at the a-th time point is smaller;

[0080] Through this calculation method, after combining the state data of the cable during operation, the temperature deviation coefficient γ of the power transmission cable in the i-th region in the first data collection i and the discrete coefficient r of the cable temperature in all regions and other diversified data, the accuracy and reliability of the calculation result of the operation risk coefficient of the power transmission cable in the i-th region at the a-th time point can be improved, thereby providing accurate and powerful data support for subsequent judgment of the cable operation state and improving the accuracy of the monitoring result.

[0081] The analysis process of the data analysis module includes:

[0082] By comparing the operation risk coefficient δ of the power transmission cable in all regions at the a-th time point ai with the preset risk coefficient threshold δ z for comparison;

[0083] If all δ ai are less than δ z , the system determines that the overall operation risk coefficient of the power transmission cable at the a-th time point is low, and the overall operation state of the cable is stable, without any faults or abnormal operation conditions;

[0084] If any δ ai is greater than δ z , the system determines that the operation risk coefficient of the power transmission cable in this area at the a-th time point is too high, and the overall operation state of the cable is unstable. Further, it is determined that the electronic transmission cable in this area may be damaged or abnormal, and a warning is given in time to remind the background management personnel to carry out maintenance;

[0085] Through the above technical solution, in this embodiment, the operation risk coefficient δ ai of the power transmission cable in all areas at the a-th time point is compared with the preset risk coefficient threshold δ z . Since the data used for analysis and comparison is highly accurate and reliable, the operation risk coefficient level of each area of the power transmission cable at the a-th time point can be accurately judged according to the comparison result. Thus, the stability of the overall operation state of the cable can be judged, and when it is judged that the electronic transmission cable in this area may be damaged or abnormal, a warning is given in time, thereby improving the maintenance efficiency;

[0086] It should be noted that the above preset risk coefficient threshold δ z can be set by fitting empirical data.

[0087] The above has described a detailed description of an embodiment of the present invention, but the content described is only a preferred embodiment of the present invention and cannot be considered as limiting the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of the present invention application should still fall within the scope covered by the patent of the present invention.

Claims

1. A power transmission equipment fault monitoring system based on an optical fiber sensor, characterized in that, The system includes: A data acquisition module, including a cable data acquisition unit and an optical fiber data acquisition unit. The cable data acquisition unit is used to acquire data information of the power transmission cable; The optical fiber data acquisition unit is used to acquire the optical fiber material data of the temperature measurement optical fiber; A region division module, used to divide the optical cable into multiple monitoring regions with the same length according to the optical cable length; An operating state monitoring module, used to acquire the state data of the power transmission cable during operation; A temperature correction and evaluation module, used to correct the temperature data of the cable monitored by the temperature measurement optical fiber by combining the data acquired by the data acquisition module, and make a preliminary evaluation of the operating state of the cable by analyzing the corrected temperature; A data processing module, used to calculate the real-time operating state risk coefficient of the power transmission cable by combining the data of the temperature correction module and the data monitored by the operating state monitoring module; A data analysis module, used to compare the real-time operating state risk coefficient of the power transmission cable with a preset risk coefficient threshold, and analyze the operating state of the cable according to the comparison result; The correction process of the temperature correction and evaluation module includes: Through the formula calculate the temperature deviation coefficient of the power transmission cable in the i-th area during one data acquisition ; and through the formula calculate the corrected temperature of the power transmission cable in the i-th area during a single data acquisition ; Among them, i is any one of the regions divided by the region division module, is the core diameter of the temperature measurement optical fiber, and the preset core diameter, is the curvature of the temperature measurement optical fiber in the i-th region during the first data acquisition, is the preset curvature, is the influence coefficient of the temperature measurement optical fiber manufacturing material, which is set by empirical fitting, is the outer layer thickness of the power transmission cable, is the preset outer layer thickness, is the standard value of, is a defined function. When , let , otherwise, let . is the influence coefficient of the power transmission cable manufacturing material, which is set by empirical fitting, is the preset outdoor temperature, is the outdoor temperature during the first data acquisition, and 2 is the weight coefficient, Q is the first proportionality coefficient, which is set by empirical fitting, is the magnitude of the original temperature monitored during the first data acquisition; The correction process of the temperature correction and evaluation module further includes: By comparing the corrected temperatures of the power transmission cables in all areas with the preset cable temperature thresholds respectively; If any is greater than , the system determines that the temperature of the power transmission cable in this area is abnormal, and there may be cable damage, and promptly issues a warning to the back-end management personnel; If all are less than , the system determines that the temperatures of the power transmission cables in all areas are normal, there is no cable damage, and further analysis is carried out in combination with the data of the operation status monitoring module.

2. The fault monitoring system for a power transmission device based on an optical fiber sensor according to claim 1, wherein, The data information of the power transmission cable includes the cable insulation layer thickness and the pressure received by the cable in different regions. The optical fiber material data of the temperature measurement optical fiber includes the core diameter, the bending degree in different regions, and the optical fiber material.

3. The fault monitoring system for a power transmission device based on an optical fiber sensor according to claim 2, wherein, The data monitored by the operating state monitoring module includes the magnitude of the current value, the magnitude of the resistance, and the magnitude of the voltage of the cable during operation.

4. The fault monitoring system for a power transmission device based on an optical fiber sensor according to claim 3, wherein, The processing process of the data processing module includes: The discrete coefficient of the cable temperature in all regions is obtained by the formula and ; where n is the total number of regions divided by the region division module, is the average value of all , g is the second proportionality coefficient, which is set by empirical fitting, is the average value of all and is the maximum value among them.

5. The fault monitoring system for a power transmission device based on an optical fiber sensor according to claim 4, wherein The processing process of the data processing module further includes: Through the formula Calculate the operating risk coefficient of the power transmission cable in the ith area at the ath time point ; Among them, a is a data monitoring once at a fixed time interval, is the pressure received by the power transmission cable in the i-th area at the a-th time point, is the preset pressure received by the cable, is the current magnitude of the power transmission cable in the i-th area at the a-th time point, is the preset current magnitude, is the resistance of the power transmission cable in the i-th area at the a-th time point, is the preset resistance, is the voltage magnitude of the power transmission cable in the i-th area at the a-th time point, is all average value, is standard value.

6. The fault monitoring system for a power transmission device based on an optical fiber sensor according to claim 5, characterized in that, The analysis process of the data analysis module includes: By comparing the operation risk coefficient of the power transmission cables in all regions at the a-th time point with a preset risk coefficient threshold for comparison; If all are less than , the system determines that the overall operation risk coefficient of the power transmission cable at the a-th time point is small, and the overall operation state of the cable is stable, and there are no faults or abnormal operation conditions; If any one is greater than , the system determines that the operation risk coefficient of the power transmission cable in this area at the a-th time point is too high, and the overall operation state of the cable is unstable. It further determines that the electronic transmission cable in this area may be damaged or abnormal, and promptly issues a warning to remind the back-end management personnel to carry out repairs.

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