Power transmission equipment fault monitoring system based on optical fiber sensor

Abstract

The invention relates to the technical field of cable monitoring, and particularly discloses a power transmission equipment fault monitoring system based on an optical fiber sensor, and the system comprises a data collection module which comprises a cable data collection unit and an optical fiber data collection unit, and the cable data collection unit is used for collecting data information of a power transmission cable; the temperature correction and evaluation module is combined with data acquired by the data acquisition module to correct the temperature data of the cable monitored by the temperature measurement optical fiber, and the reliability and accuracy of the temperature monitoring data can be improved based on diversified data as a support, so that the accuracy of preliminary judgment of the running state of the cable is improved, and the working efficiency of the cable is improved. And then the real-time operation state risk coefficient of the power transmission cable is calculated through the data processing module in combination with the data of the temperature correction module and the data monitored by the operation state monitoring module, and the operation state of the transmission cable can be further analyzed, so that the accuracy and reliability of a cable fault monitoring result are improved.

Description

Technical Field

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

[0002] Power transmission equipment refers to a series of systems and equipment used to transmit electrical energy. Its main purpose is to transmit the electrical energy generated by a power station or power source from the starting point to the end user or other electrical equipment. Among them, cables are conductors for transmitting electrical energy and signals, and their importance is self-evident. Therefore, cable fault monitoring is very necessary.

[0003] Currently, the common cable fault monitoring system is to perform real-time monitoring through the temperature measuring optical fiber in the optical fiber sensor. During the cable laying process, the temperature measuring 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 due to the influence of temperature. This change will be captured by the data acquisition and analysis system and converted into temperature data information. The operating status of the cable and whether there is a fault will be judged based on the temperature data information.

[0004] In the prior art, cable fault monitoring is usually carried out by measuring the temperature of the cable based on the change in the light intensity of the temperature measuring optical fiber itself. However, the released temperature of the cable may be affected by different factors and may deviate. At this time, the change in the light intensity of the temperature measuring optical fiber cannot truly reflect the actual temperature of the cable, thereby causing deviations in the cable fault monitoring. In addition, monitoring the cable fault based solely on the cable temperature has a low sensitivity, which will also lead to large deviations in the cable fault monitoring results. Summary of the invention

[0005] The purpose of the present invention is to provide a power transmission equipment fault monitoring system based on optical fiber sensors to 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 power transmission equipment fault monitoring system based on optical fiber sensors, the system comprising:

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

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

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

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

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

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

[0015] The data analysis module is used to compare the real-time operating status risk factor of the power transmission cable with the preset operating status risk factor, 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 measuring optical fiber includes the core diameter, the degree of bending in different areas and the optical fiber material.

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

[0018] By formula Calculate the temperature deviation coefficient γ of the power transmission cable in the i-th area during a data acquisition i ;

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

[0020] Among them, i is any area divided by the area division module, zj is the core diameter of the temperature measurement optical fiber, and zj y With the preset core diameter, wq i is the curvature of the temperature measuring optical fiber in the ith area during a data collection, wq y is the preset curvature, σ is the influence coefficient of the material of the temperature measuring optical fiber, which is set according to empirical fitting, hd is the outer 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 the definition function. When (x) ≥ 1, let f q (x) = (x), otherwise, let f q(x) = 1, ρ is the influence coefficient of the material of the power transmission cable, which is set according to empirical fitting, wd y is the preset outdoor temperature, wd is the outdoor temperature in a data collection, x1 and x2 are weight coefficients, Q is the first proportional coefficient, which is set according to empirical fitting, and ω is the original temperature monitored in a data collection.

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

[0022] By correcting the temperature of the power transmission cables in all areas The cable temperature thresholds are set to Make a comparison;

[0023] If any Greater than The system determines that the temperature of the power transmission cable in the area is abnormal, indicating that the cable may be damaged, and promptly issues an early warning to the back-end management personnel;

[0024] If all All less than The system determines that the temperature of the power transmission cables in all areas is normal and there is no cable damage, and conducts further analysis based on the data from the operation status monitoring module.

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

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

[0027] By formula Calculate and obtain the dispersion coefficient r of the cable temperature in all areas;

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

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

[0030] By formula Calculate the operating risk coefficient δ of the power transmission cable in the i-th area at the a-th time point ai ;

[0031] Among them, a is a data monitoring at a fixed time interval, yl aiis the pressure on the power transmission cable in the ith region at the ath time point, yl y is the preset pressure on the cable, dl ai is the current of the power transmission cable in the ith region at the ath time point, dl y is the preset current size, dz ai is the resistance of the power transmission cable in the ith region at the ath time point, dz y is the preset resistance, dy ai is the voltage of the power transmission cable in the ith region at the ath time point, For all ai The average value of dy b For ai The standard value of .

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

[0033] By calculating the operating risk coefficient δ of all power transmission cables in the area at time a ai and the preset risk factor threshold δ z Make a comparison;

[0034] If all δ ai All less than δ z , the system determines that the overall operation risk coefficient of the power transmission cable at the ath time point is small, and the overall operation status of the cable is stable, without any fault or abnormal operation status;

[0035] If any δ ai Greater than δ z The system determines that the operating risk coefficient of the power transmission cables in the area at the ath time point is too large, and the overall operating state of the cables is unstable. It further determines that the electronic transmission cables in the area may be damaged or abnormal, and promptly issues an early warning to remind the back-end management personnel to carry out repairs.

[0036] Beneficial effects of the present invention:

[0037] (1) The present invention corrects the temperature data of the cable monitored by the temperature measuring optical fiber through the temperature correction evaluation module combined with the data collected by the data acquisition module. Based on the 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 status of the cable. After that, the data processing module combines the data of the temperature correction module with the data obtained by the operating status monitoring module to calculate the real-time operating status risk coefficient of the power transmission cable. The operating status of the transmission cable can be further analyzed, thereby improving the accuracy and reliability of the cable fault monitoring results.

[0038] (2) The present invention can accurately calculate the temperature deviation coefficient of the power transmission cable in the ith area in a data collection by combining the information data of the temperature measuring optical fiber and the transmission cable. The data can reflect the deviation between the cable temperature monitored by the temperature measuring optical fiber and the actual temperature of the cable. Based on the data, the corrected temperature of the power transmission cable in the ith area is calculated, which can make the calculated temperature data more consistent with the actual data, thereby improving the reliability and accuracy of the temperature data, thereby avoiding large deviations in subsequent cable fault monitoring and ensuring the accuracy of the detection results.

[0039] (3) The present invention corrects the temperature of the power transmission cables in all areas. The cable temperature thresholds are set to By comparing and accurately judging whether the power transmission cable is damaged according to its temperature, the system can decide whether to issue an early warning to the back-end management personnel or to conduct further analysis based on the data from the operation status monitoring module, thereby improving the accuracy and reliability of the cable fault monitoring results. In addition, this analysis method analyzes the cable status in different areas, so when it is judged that the cable may be damaged, it can be quickly located, thereby improving maintenance efficiency.

[0040] (4) The present invention combines the state data of the cable during operation, the temperature deviation coefficient γ of the power transmission cable in the i-th area in a data collection, and the i By obtaining diversified data such as the dispersion coefficient r of cable temperature in all areas, the accuracy and reliability of the calculation results of the operation risk coefficient of the power transmission cable in the ith area at the ath time point can be improved, thereby providing accurate and powerful data support for the subsequent judgment of the cable operation status and improving the accuracy of the monitoring results.

[0041] (5) The present invention calculates the operating risk coefficient δ of the power transmission cables in all areas at the ath time point. ai and the preset risk factor threshold δ z Because the data used for analysis and comparison has high accuracy and reliability, the comparison results can be used to accurately judge the operating risk coefficient of each area of ​​the power transmission cable at the ath time point, thereby judging the stability of the overall operating state of the cable, and when it is judged that the electronic transmission cable in the area may be damaged or abnormal, an early warning can be issued in time, thereby improving maintenance efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0043] Figure 1It is a schematic block diagram of a power transmission equipment fault monitoring system based on optical fiber sensors in the present invention. DETAILED DESCRIPTION

[0044] 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 only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] See also Figure 1 As shown, in one embodiment, the present application provides a power transmission equipment fault monitoring system based on optical fiber sensors, the system comprising:

[0046] A data acquisition module, comprising a cable data acquisition unit and an optical fiber data acquisition unit, wherein the cable data acquisition unit is used to collect data information of the power transmission cable;

[0047] The optical fiber data acquisition unit is used to collect optical fiber material data of the temperature measuring optical fiber;

[0048] The area division module is used to divide the optical cable into multiple monitoring areas of the same length according to its length;

[0049] An operation status monitoring module is used to collect status data of the power transmission cable during operation;

[0050] The temperature correction evaluation module is used to correct the temperature data of the cable monitored by the temperature measuring optical fiber in combination with the data collected by the data acquisition module, and to make a preliminary evaluation of the operating status of the cable by analyzing the corrected temperature;

[0051] A data processing module, used to calculate the real-time operating status risk coefficient of the power transmission cable by combining the data of the temperature correction module with the data monitored by the operating status monitoring module;

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

[0053] Through the above technical scheme, this embodiment provides a data acquisition module to collect data information of the power transmission cable and optical fiber material data of the temperature measuring optical fiber, and divides it into multiple monitoring areas of the same length according to the length of the optical cable through the area division module, and then the temperature correction evaluation module can be combined with the data collected by the data acquisition module to correct the temperature data of the cable monitored by the temperature measuring optical fiber, and analyze the corrected temperature, and make a preliminary evaluation of the operating status of the cable. When it is judged that the current temperature of the cable is relatively stable, the operating status monitoring module is used to collect the status data of the power transmission cable during operation, and then the data processing module is combined with the data of the temperature correction module and the data obtained by the operating status monitoring module to calculate the real-time operating status risk coefficient of the power transmission cable, and the real-time operating status risk coefficient of the power transmission cable is compared with the preset operating status risk coefficient through the data analysis module, and the operating status of the cable is analyzed according to the comparison result;

[0054] Through such a setting, the system first corrects the temperature data of the cable monitored by the temperature measuring optical fiber through the temperature correction evaluation module combined with the data collected by the data acquisition module. Based on the 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 status of the cable. After that, the data processing module combines the data of the temperature correction module with the data obtained by the operating status monitoring module to calculate the real-time operating status risk coefficient of the power transmission cable, and the operating status of the transmission cable can be further analyzed, 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 areas, and the optical fiber material data of the temperature measuring optical fiber includes the core diameter, the degree of bending in different areas and the optical fiber material;

[0056] Through the above technical solution, this embodiment provides data information of the power transmission cable and fiber material data of the temperature measuring optical fiber. The data reflects the physical properties of the transmission cable and the temperature measuring optical fiber, which affects the conduction of temperature. Therefore, the temperature correction evaluation module can correct the temperature data of the cable in combination with the data, so that the monitored cable temperature data is closer to the actual value, thereby improving the accuracy of the subsequent preliminary judgment on the operating status of the cable.

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

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

[0059] And through the formula Calculate the corrected temperature of the power transmission cable in the i-th area during a data collection

[0060] Among them, i is any area divided by the area division module, zj is the core diameter of the temperature measurement optical fiber, and zj y With the preset core diameter, wq i is the curvature of the temperature measuring optical fiber in the ith area during a data collection, wq y is the preset curvature, σ is the influence coefficient of the material of the temperature measuring optical fiber, which is set according to empirical fitting, hd is the outer thickness of the power transmission cable, hd y is the preset outer layer thickness, hd b is the standard value of hd, which can be set based on the allowable error in empirical data. q (x) is the definition function. When (x) ≥ 1, let f q (x) = (x), otherwise, let f q (x) = 1, ρ is the influence coefficient of the material of the power transmission cable, which is set according to empirical fitting, wd y is the preset outdoor temperature, wd is the outdoor temperature in a data collection, x1 and x2 are weight coefficients, which are set according to experience fitting, Q is the first proportional coefficient, which is set according to experience fitting, and ω is the original temperature monitored in a data collection;

[0061] Through the above technical solution, this embodiment provides the temperature deviation coefficient γ of the power transmission cable in the i-th area in one data collection. i , can be obtained by formula It is calculated that, obviously, when the core diameter of the temperature measuring optical fiber and the outer thickness of the cable are larger, and the curvature and temperature of the temperature measuring optical fiber in the i-th region are higher, the temperature deviation coefficient of the power transmission cable in the i-th region in one data collection is larger, indicating that the temperature data collected in this case has a larger deviation. On the contrary, when the core diameter of the temperature measuring optical fiber and the outer thickness of the cable are smaller, and the curvature and temperature of the temperature measuring optical fiber in the i-th region are lower, the temperature deviation coefficient of the power transmission cable in the i-th region in one data collection 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 in one data collection The formula can be By this calculation method, the temperature deviation coefficient γ of the power transmission cable in the ith area in a data collection is obtained. i, the corrected temperature can be calculated to make the temperature closer to the actual situation, thereby providing accurate data support for subsequent determination of whether the cable is in an abnormal state.

[0063] Through such a setting, by combining the information data of the temperature measuring optical fiber and the transmission cable, the temperature deviation coefficient of the power transmission cable in the ith area in a data collection can be accurately calculated. The data can reflect the deviation between the cable temperature monitored by the temperature measuring optical fiber and the actual temperature of the cable, and based on the data, the corrected temperature of the power transmission cable in the ith area is calculated, which can make the calculated temperature data more consistent with the actual data, thereby improving the reliability and accuracy of the temperature data, thereby avoiding large deviations in subsequent cable fault monitoring and ensuring the accuracy of the detection results.

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

[0065] By correcting the temperature of the power transmission cables in all areas The cable temperature thresholds are set to Make a comparison;

[0066] If any Greater than The system determines that the temperature of the power transmission cable in the area is abnormal, indicating that the cable may be damaged, and promptly issues an early warning to the back-end management personnel;

[0067] If all All less than The system determines that the temperature of the power transmission cables in all areas is normal and there is no cable damage, and conducts further analysis based on the data from the operation status monitoring module;

[0068] Through the above technical solution, this embodiment uses the corrected temperature of the power transmission cables in all areas The cable temperature thresholds are set to Compare and make accurate judgment on whether the cable is damaged according to the temperature of the power transmission cable, and decide whether to issue an early warning to the back-end management personnel or conduct further analysis based on the judgment result, so as to improve the accuracy and reliability of the cable fault monitoring results. In addition, this analysis method analyzes the cable status in different areas, so when it is judged that the cable may be damaged, it can be quickly located, thereby improving the maintenance efficiency;

[0069] It should be noted that the above preset cable temperature threshold The setting can be fitted according to empirical data.

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

[0071] Through the above technical solution, this embodiment provides data monitored by the operation status monitoring module, which reflects the status of the cable during operation. By combining the data of 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] By formula Calculate and obtain the dispersion coefficient r of the cable temperature in all areas;

[0074] Among them, n is the total number of regions divided by the region division module, For all The average value of g is the second proportional coefficient, which is set according to empirical fitting. For all The maximum value in ;

[0075] Through the above technical solution, this embodiment provides a dispersion coefficient r of the cable temperature in all areas, which can be calculated by the formula It is obtained by calculation. Through this calculation method, the temperature distribution of the entire cable can be judged. When the dispersion coefficient r of the cable temperature in all areas is low, it means that the temperature difference in each area of ​​the entire cable is small, which means that the usage of the cable in each area is roughly the same, and there is no abnormality or cable damage in a certain area. When the dispersion coefficient r of the cable temperature in some areas is high, it means that the temperature difference in each area of ​​the entire cable is large, which means that the usage of the cable in each area is different, and there may be some areas with imperceptible abnormalities or minor damage. Through such a setting, it is shown that the dispersion coefficient of the cable temperature in all areas is closely related to the abnormality or damage of the cable, so the data can provide data support for the subsequent judgment of the risk level of the cable operation status, thereby improving the accuracy and reliability of the cable fault monitoring results.

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

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

[0078] Among them, a is a data monitoring at a fixed time interval, yl ai is the pressure on the power transmission cable in the ith region at the ath time point, yl yis the preset pressure on the cable, dl ai is the current of the power transmission cable in the ith region at the ath time point, dl y is the preset current size, dz ai is the resistance of the power transmission cable in the ith region at the ath time point, dz y is the preset resistance, dy ai is the voltage of the power transmission cable in the ith region at the ath time point, For all ai The average value of dy b For ai The 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 area at the a-th time point: ai , can be obtained by formula Calculate and obtain, where The voltage fluctuation value of the power transmission cable in all regions at the ath time point can be calculated, so it can be seen that when the pressure on the power transmission cable in the ith region at the ath time point is greater, and the current, resistance and the voltage fluctuation value of the power transmission cable in all regions at the ath time point are higher, then the operation risk of the power transmission cable in the ith region at the ath time point is greater; conversely, when the pressure on the power transmission cable in the ith region at the ath time point is smaller, and the current, resistance and the voltage fluctuation value of the power transmission cable in all regions at the ath time point are lower, then the operation risk of the power transmission cable in the ith region at the ath time point is smaller;

[0080] Through this calculation method, the state data of the cable during operation and the temperature deviation coefficient γ of the power transmission cable in the i-th area in one data collection are combined. i By obtaining diversified data such as the dispersion coefficient r of cable temperature in all areas, the accuracy and reliability of the calculation results of the operation risk coefficient of the power transmission cable in the ith area at the ath time point can be improved, thereby providing accurate and powerful data support for the subsequent judgment of the cable operation status and improving the accuracy of the monitoring results.

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

[0082] By calculating the operating risk coefficient δ of all power transmission cables in the area at time a ai and the preset risk factor threshold δ z Make a comparison;

[0083] If all δ ai All less than δ z , the system determines that the overall operation risk coefficient of the power transmission cable at the ath time point is small, and the overall operation status of the cable is stable, without any fault or abnormal operation status;

[0084] If any δ ai Greater than δ z , the system determines that the operating risk coefficient of the power transmission cables in the area at the ath time point is too large, and the overall operating state of the cables is unstable. It further determines that the electronic transmission cables in the area may be damaged or abnormal, and promptly issues an early warning to remind the backend management staff to carry out maintenance;

[0085] Through the above technical solution, this embodiment calculates the operation risk coefficient δ of the power transmission cables in all areas at the ath time point. ai and the preset risk factor threshold δ z Comparison is performed. Since the data used for analysis and comparison has high accuracy and reliability, the operation risk coefficient of each area of ​​the power transmission cable at the ath time point can be accurately judged according to the comparison results, so as to judge the stability of the overall operation state of the cable, and when it is judged that the electronic transmission cable in the area may be damaged or abnormal, an early warning is issued in time, thereby improving the maintenance efficiency;

[0086] It should be noted that the above preset risk factor threshold δ z The setting can be fitted according to empirical data.

[0087] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A power transmission equipment fault monitoring system based on optical fiber sensor, characterized in that: The system comprises: A data acquisition module, comprising a cable data acquisition unit and an optical fiber data acquisition unit, wherein the cable data acquisition unit is used to collect data information of the power transmission cable; The optical fiber data acquisition unit is used to collect optical fiber material data of the temperature measuring optical fiber; The area division module is used to divide the optical cable into multiple monitoring areas of the same length according to its length; An operation status monitoring module is used to collect status data of the power transmission cable during operation; The temperature correction evaluation module is used to correct the temperature data of the cable monitored by the temperature measuring optical fiber in combination with the data collected by the data acquisition module, and to make a preliminary evaluation of the operating status of the cable by analyzing the corrected temperature; A data processing module, used to calculate the real-time operating status risk coefficient of the power transmission cable by combining the data of the temperature correction module with the data monitored by the operating status monitoring module; The data analysis module is used to compare the real-time operating status risk factor of the power transmission cable with a preset risk factor threshold, and analyze the operating status of the cable based on the comparison result.

2. The optical fiber sensor-based power transmission equipment fault monitoring system according to claim 1, characterized in that: 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 measuring optical fiber includes the core diameter, the degree of bending in different areas and the optical fiber material.

3. The optical fiber sensor-based power transmission equipment fault monitoring system according to claim 2, characterized in that: The correction process of the temperature correction evaluation module includes: By formula Calculate the temperature deviation coefficient γ of the power transmission cable in the i-th area during a data acquisition i ; And through the formula Calculate the corrected temperature θ of the power transmission cable in the i-th area during a data collection i ; Among them, i is any area divided by the area division module, zj is the core diameter of the temperature measurement optical fiber, and zj y With the preset core diameter, wq i is the curvature of the temperature measuring optical fiber in the ith area during a data collection, wq y is the preset curvature, σ is the influence coefficient of the material of the temperature measuring optical fiber, which is set according to empirical fitting, hd is the outer 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 the definition function. When (x) ≥ 1, let f q (x) = (x), otherwise, let f q (x) = 1, ρ is the influence coefficient of the material of the power transmission cable, which is set according to empirical fitting, wd y is the preset outdoor temperature, wd is the outdoor temperature in a data collection, x1 and x2 are weight coefficients, Q is the first proportional coefficient, which is set according to empirical fitting, and ω is the original temperature monitored in a data collection.

4. The optical fiber sensor-based power transmission equipment fault monitoring system according to claim 3, characterized in that: The correction process of the temperature correction evaluation module also includes: By correcting the temperature θ of the power transmission cables in all areas i and the preset cable temperature threshold θ z Make a comparison; If any θ i Greater than θ z , the system determines that the temperature of the power transmission cable in the area is abnormal, and there may be cable damage, and promptly issues an early warning to the back-end management personnel; If all θ i Both are less than θ z ,The system determines that the temperature of the power transmission cables in all areas is normal, and there is no cable damage, and further analysis is carried out in combination with the data from the operation status monitoring module.

5. The optical fiber sensor-based power transmission equipment fault monitoring system according to claim 4, characterized in that: The data monitored by the operation status monitoring module include the current value, resistance value and voltage value of the cable during operation.

6. The optical fiber sensor-based power transmission equipment fault monitoring system according to claim 5, characterized in that: The processing process of the data processing module includes: By formula Calculate and obtain the dispersion coefficient r of the cable temperature in all areas; Among them, n is the total number of regions divided by the region division module, For all θ i The average value of g is the second proportional coefficient, which is set according to empirical fitting. For all θ i The maximum value in .

7. The optical fiber sensor-based power transmission equipment fault monitoring system according to claim 6, characterized in that: The processing process of the data processing module also includes: By formula Calculate the operating risk coefficient δ of the power transmission cable in the i-th area at the a-th time point ai ; Among them, a is a data monitoring at a fixed time interval, yl ai is the pressure on the power transmission cable in the ith region at the ath time point, yl y is the preset pressure on the cable, dl ai is the current of the power transmission cable in the ith region at the ath time point, dl y is the preset current size, dz ai is the resistance of the power transmission cable in the ith region at the ath time point, dz y is the preset resistance, dy ai is the voltage of the power transmission cable in the ith region at the ath time point, For all ai The average value of dy b For ai The standard value of .

8. The optical fiber sensor-based power transmission equipment fault monitoring system according to claim 7, characterized in that: The analysis process of the data analysis module includes: By calculating the operating risk coefficient δ of all power transmission cables in the area at time a ai and the preset risk factor threshold δ z Make a comparison; If all δ ai All less than δ z , the system determines that the overall operation risk coefficient of the power transmission cable at the ath time point is small, and the overall operation status of the cable is stable, without any fault or abnormal operation status; If any δ ai Greater than δ z The system determines that the operating risk coefficient of the power transmission cables in the area at the ath time point is too large, and the overall operating state of the cables is unstable. It further determines that the electronic transmission cables in the area may be damaged or abnormal, and promptly issues an early warning to remind the back-end management personnel to carry out repairs.

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