CN119374756A - A power transmission equipment fault monitoring system based on optical fiber sensor - Google Patents
A power transmission equipment fault monitoring system based on optical fiber sensor Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
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- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/20—Compensating for effects of temperature changes other than those to be measured, e.g. changes in ambient temperature
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G06F18/00—Pattern recognition
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- G06F18/25—Fusion techniques
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00001—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00016—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using a wired telecommunication network or a data transmission bus
- H02J13/00017—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using a wired telecommunication network or a data transmission bus using optical fiber
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Abstract
本发明涉及电缆监测技术领域，具体公开了一种基于光纤传感器的电力传输设备故障监测系统，数据采集模块，包括电缆数据采集单元与光纤数据采集单元，所述电缆数据采集单元用于采集电力传输电缆的数据信息，通过温度修正评估模块结合数据采集模块采集的数据，对测温光纤监测到的电缆的温度数据进行修正，基于多元化的数据作为支撑，可以提高温度监测数据的可靠性与准确性，从而提高电缆的运行状态初步判断的准确性，之后通过数据处理模块结合温度修正模块的数据与运行状态监测模块监测获得的数据，对电力传输电缆的实时运行状态风险系数进行计算，可以进一步对传输电缆的运行状态进行分析，从而提高电缆故障监测结果的准确性与可靠性。
The present invention relates to the field of cable monitoring technology, and specifically discloses a power transmission equipment fault monitoring system based on optical fiber sensor, a data acquisition module, including 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, and the temperature data of the cable monitored by the temperature measuring optical fiber is corrected by a temperature correction evaluation module in combination 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. Afterwards, the real-time operating status risk coefficient of the power transmission cable is calculated by combining the data of the temperature correction module with the data obtained by the operating status monitoring module through the data processing module, and the operating status of the transmission cable can be further analyzed, thereby improving the accuracy and reliability of the cable fault monitoring result.
Description
Technical Field
The invention relates to the technical field of cable monitoring, in particular to a fault monitoring system of power transmission equipment based on an optical fiber sensor.
Background
Power transmission devices refer to a series of systems and devices for delivering electrical energy, the main purpose of which is to transmit power generated by a power station or power source from a starting point to a terminal user or other consumer, wherein a cable is used as a conductor for transmitting power and signals, the importance of which is self-evident, so fault monitoring for the cable is very necessary.
At present, a common cable fault monitoring system monitors a temperature measuring optical fiber in an optical fiber sensor in real time, the temperature measuring optical fiber is tightly attached to the surface of a transmission cable in the process of laying the cable, when the temperature of the cable changes, light in the optical fiber changes due to the influence of the temperature, the change is captured by a data acquisition and analysis system and is converted into temperature data information, and the operation state of the cable and whether faults exist or not are judged according to the temperature data information.
In the prior art, aiming at cable fault monitoring, the temperature of the cable is usually measured according to the change of the self light intensity of the temperature measuring optical fiber, but the released temperature of the cable is possibly influenced by different factors to generate deviation, and at the moment, the change of the light intensity of the temperature measuring optical fiber cannot truly reflect the actual temperature condition of the cable, so that the deviation exists in cable fault monitoring, the cable fault is monitored by the temperature of the cable alone, the sensitivity is lower, and the cable fault monitoring result is also greatly deviated.
Disclosure of Invention
The invention aims to provide a power transmission equipment fault monitoring system based on an optical fiber sensor, which solves the following technical problems:
how to improve the accuracy and reliability of the cable fault monitoring result.
The aim of the invention can be achieved by the following technical scheme:
a fiber optic sensor-based power transmission equipment fault monitoring system, the system comprising:
The data acquisition module comprises a cable data acquisition unit and an optical fiber data acquisition unit, wherein the cable data acquisition unit is used for acquiring data information of the power transmission cable;
the optical fiber data acquisition unit is used for acquiring optical fiber material data of the temperature measuring optical fiber;
The area dividing module is used for dividing the optical cable into a plurality of monitoring areas with the same length according to the length of the optical cable;
the running state monitoring module is used for collecting state data of the power transmission cable in the running process;
The temperature correction evaluation module is used for correcting the temperature data of the cable monitored by the temperature measuring optical fiber by combining the data acquired by the data acquisition module, analyzing the corrected temperature, and carrying out preliminary evaluation on the operation state of the cable;
The data processing module is used for combining the data of the temperature correction module and the data obtained by monitoring of the running state monitoring module to calculate the real-time running state risk coefficient of the power transmission cable;
The data analysis module is used for comparing the real-time running state risk coefficient of the power transmission cable with a preset running state risk coefficient and analyzing the running state of the cable according to a comparison result.
Further, the data information of the power transmission cable comprises the thickness of the cable insulation layer and the pressure applied to the cable in different areas, and the optical fiber material data of the temperature measuring optical fiber comprise the diameter of the fiber core, the bending degree in different areas and the optical fiber material.
Further, the correction process of the temperature correction evaluation module includes:
by the formula Calculating to obtain a temperature deviation coefficient gamma i of the power transmission cable in the ith area in the primary data acquisition;
And pass through the formula Calculating the corrected temperature of the power transmission cable in the ith area in the primary data acquisition
Wherein i is any region divided by the region dividing module, zj is the core diameter of the temperature measuring optical fiber, zj y and the preset core diameter, wq i is the curvature of the temperature measuring optical fiber in the ith region in one-time data acquisition, wq y is the preset curvature, sigma is the temperature measuring optical fiber manufacturing material influence coefficient, hd is the outer layer thickness of the power transmission cable according to empirical fit setting, hd y is the preset outer layer thickness, hd b is the standard value of hd, f q (x) is a defined function, f q (x) = (x) is made when (x) is more than or equal to 1, otherwise, f q (x) = (x) is made to be 1, rho is the power transmission cable manufacturing material influence coefficient according to empirical fit setting, wd y is the preset outdoor temperature in one-time data acquisition, wd is the outdoor temperature in one-time, x1 and x2 is the weight coefficient, Q is the first ratio coefficient according to empirical fit setting, and ω is the original temperature value monitored in one-time data acquisition.
Further, the correction process of the temperature correction evaluation module further includes:
By modifying the temperature of the power transmission cable in all areas Respectively with preset cable temperature threshold valuesComparing;
If any one of Greater thanThe system judges that the temperature of the power transmission cable in the area is abnormal, the cable is possibly damaged, and early warning is sent to a background manager in time;
If all are Are all smaller thanThe system judges that the temperatures of the power transmission cables in all areas are normal, the condition that the cables are damaged is avoided, and the system combines the data of the operation state monitoring module to further analyze.
Further, the data monitored by the running state monitoring module comprises the current value, the resistance value and the voltage value of the cable in the running process.
Further, the processing procedure of the data processing module comprises:
by the formula Calculating to obtain a discrete coefficient r of the cable temperature in all areas;
Wherein n is the total number of the areas divided by the area dividing module, For all ofG is a second scaling factor, set by empirical fit,For all ofIs the maximum value of (a).
Further, the processing procedure of the data processing module further comprises:
by the formula Calculating and obtaining an operation risk coefficient delta ai of the power transmission cable in the ith area at the a-th time point;
Wherein a is one data monitoring at fixed time intervals, yl ai is the pressure applied to the power transmission cable in the ith area at the a-th time point, yl y is the pressure applied to the preset cable, dl ai is the current magnitude of the power transmission cable in the ith area 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 ith area 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 ith area at the a-th time point, Dy b is a standard value of dy ai, which is the average value of all dy ai.
Further, the analysis process of the data analysis module includes:
Comparing the running risk coefficient delta ai of the power transmission cables in all areas at the a-th time point with a preset risk coefficient threshold delta z;
if all delta ai is smaller than delta z, the system judges that the running risk coefficient of the whole power transmission cable at the a-th time point is small, the running state of the whole cable is stable, and no fault or abnormal running condition exists;
If any delta ai is larger than delta z, the system judges that the running risk coefficient of the power transmission cable in the area at the a-th time point is too large, the running state of the whole cable is unstable, further judges that the electronic transmission cable in the area is possibly damaged or abnormal, and timely gives an early warning to remind a background manager to maintain.
The invention has the beneficial effects that:
(1) According to the invention, the temperature correction evaluation module is combined with the data acquired by the data acquisition module to correct the temperature data of the cable monitored by the temperature measuring optical fiber, and the reliability and the accuracy of the temperature monitoring data can be improved based on the diversified data as a support, so that the accuracy of preliminary judgment of the operation state of the cable is improved, and then the real-time operation state risk coefficient of the power transmission cable is calculated by combining the data of the temperature correction module with the data acquired by the operation state monitoring module through the data processing module, so that the operation state of the transmission cable can be further analyzed, and the accuracy and the reliability of the cable fault monitoring result are improved.
(2) According to the invention, after the information data of the temperature measuring optical fiber and the transmission cable are combined, the temperature deviation coefficient of the power transmission cable in the ith area in one data acquisition can be accurately calculated, the data can reflect the deviation between the cable temperature monitored by the temperature measuring optical fiber and the actual cable temperature, the temperature corrected by the power transmission cable in the ith area is calculated based on the data, and the calculated temperature data can be more attached to the actual data, so that the reliability and accuracy of the temperature data are improved, the larger deviation in the subsequent cable fault monitoring process is avoided, and the accuracy of a detection result is ensured.
(3) The invention corrects the temperature of the power transmission cable in all areasRespectively with preset cable temperature threshold valuesThe method comprises the steps of comparing, accurately judging whether the cable is damaged according to the temperature of the power transmission cable, deciding whether to send out early warning to a background manager or further analyze the data of the operation state monitoring module according to the judging result, and accordingly improving the accuracy and reliability of the cable fault monitoring result.
(4) According to the invention, by combining state data of the cable in the operation process, temperature deviation coefficient gamma i of the power transmission cable in the ith area in one-time data acquisition, discrete coefficient r of the cable temperature in all areas and other diversified data, the accuracy and reliability of the operation risk coefficient calculation result of the power transmission cable in the ith area at the a-th time point can be improved, so that accurate and powerful data support is provided for judging the cable operation state in the follow-up process, and the accuracy of the monitoring result is improved.
(5) According to the invention, the running risk coefficients delta ai of the power transmission cables in all the areas at the a-th time point are compared with the preset risk coefficient threshold delta z, and as the data for analysis and comparison have higher accuracy and reliability, the running risk coefficients of the power transmission cables in all the areas at the a-th time point can be accurately judged according to the comparison result, so that the stability of the running state of the whole cable is judged, and early warning is timely made when the electronic transmission cables in the areas are judged to be possibly damaged or abnormal, so that the maintenance efficiency is improved.
Drawings
The invention is further described below with reference to the accompanying drawings.
Fig. 1 is a schematic block diagram of a power transmission equipment fault monitoring system based on an optical fiber sensor in the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, in one embodiment, the present application provides a power transmission device fault monitoring system based on an optical fiber sensor, the system comprising:
The data acquisition module comprises a cable data acquisition unit and an optical fiber data acquisition unit, wherein the cable data acquisition unit is used for acquiring data information of the power transmission cable;
the optical fiber data acquisition unit is used for acquiring optical fiber material data of the temperature measuring optical fiber;
The area dividing module is used for dividing the optical cable into a plurality of monitoring areas with the same length according to the length of the optical cable;
the running state monitoring module is used for collecting state data of the power transmission cable in the running process;
The temperature correction evaluation module is used for correcting the temperature data of the cable monitored by the temperature measuring optical fiber by combining the data acquired by the data acquisition module, analyzing the corrected temperature, and carrying out preliminary evaluation on the operation state of the cable;
The data processing module is used for combining the data of the temperature correction module and the data obtained by monitoring of the running state monitoring module to calculate the real-time running state risk coefficient of the power transmission cable;
The data analysis module is used for comparing the real-time running state risk coefficient of the power transmission cable with a preset running state risk coefficient and analyzing the running state of the cable according to a comparison result;
According to the technical scheme, the data acquisition module acquires data information of the power transmission cable and optical fiber material data of the temperature measuring optical fiber, the data acquisition module divides the data acquisition module into a plurality of monitoring areas with the same length according to the length of the optical fiber, then the temperature correction evaluation module is combined with the data acquired by the data acquisition module to correct the temperature data of the cable monitored by the temperature measuring optical fiber, the corrected temperature is analyzed, the operation state of the cable is primarily evaluated, when the temperature of the current cable is judged to be stable, the operation state monitoring module is used for acquiring state data of the power transmission cable in the operation process, then the data processing module is combined with the data of the temperature correction module and the data obtained by the operation state monitoring module to calculate the real-time operation state risk coefficient of the power transmission cable, the real-time operation state risk coefficient of the power transmission cable is compared with the preset operation state risk coefficient through the data analysis module, and the operation state of the cable is analyzed according to the comparison result;
Through the arrangement, the system corrects the temperature data of the cable monitored by the temperature measuring optical fiber by combining the data acquired by the temperature correction evaluation module with the data acquired by the data acquisition module, and based on diversified data as a support, the reliability and the accuracy of the temperature monitoring data can be improved, so that the accuracy of preliminary judgment of the operation state of the cable can be improved, and then the real-time operation state risk coefficient of the power transmission cable can be calculated by combining the data of the temperature correction module with the data acquired by the operation state monitoring module through the data processing module, and the operation state of the transmission cable can be further analyzed, so that the accuracy and the reliability of the cable fault monitoring result are improved.
The data information of the power transmission cable comprises the thickness of a cable insulating layer and the pressure born by the cable in different areas, and the optical fiber material data of the temperature measuring optical fiber comprises the diameter of a fiber core, the bending degree in different areas and the optical fiber material;
Through the technical scheme, the embodiment provides the data information of the power transmission cable and the optical fiber material data of the temperature measuring optical fiber, the data reflects the physical characteristics of the transmission cable and the temperature measuring optical fiber, and the physical characteristics influence the temperature conduction, so the temperature correction evaluation module can be combined with the data to correct the temperature data of the cable, so that the monitored temperature data of the cable is closer to a real numerical value, and the accuracy of the follow-up preliminary judgment on the operation state of the improved cable is improved.
The correction process of the temperature correction evaluation module comprises the following steps:
by the formula Calculating to obtain a temperature deviation coefficient gamma i of the power transmission cable in the ith area in the primary data acquisition;
And pass through the formula Calculating the corrected temperature of the power transmission cable in the ith area in the primary data acquisition
Wherein i is any region divided by the region dividing module, zj is the core diameter of the temperature measuring optical fiber, zj y and the preset core diameter, wq i is the curvature of the temperature measuring optical fiber in the i-th region in one-time data acquisition, wq y is the preset curvature, sigma is the temperature measuring optical fiber manufacturing material influence coefficient, hd is the outer layer thickness of the power transmission cable according to empirical fit setting, hd y is the preset outer layer thickness, hd b is the standard value of hd, the standard value can be set in suspension according to the allowable error in the empirical data, f q (x) is a definition function, f q (x) = (x) is made when (x) is equal to 1, otherwise, f q (x) = 1, rho is the power transmission cable manufacturing material influence coefficient, wd y is the preset outdoor temperature in one-time data acquisition, x1 and x2 are weight coefficients, Q is the first fitting coefficient according to empirical fit setting, and omega is the initial temperature in one-time data acquisition;
Through the above technical solution, the present embodiment provides a temperature deviation coefficient gamma i of the power transmission cable in the ith area in one data acquisition, which can be calculated by the formula The calculation shows that when the core diameter of the temperature measuring optical fiber and the thickness of the outer layer of the cable are larger and the bending degree and the temperature of the temperature measuring optical fiber in the ith area are higher, the temperature deviation coefficient of the power transmission cable in the ith area in one data acquisition is larger, which means that the temperature data acquired under the condition has larger deviation, otherwise, when the core diameter of the temperature measuring optical fiber and the thickness of the outer layer of the cable are smaller and the bending degree and the temperature of the temperature measuring optical fiber in the ith area are lower, the temperature deviation coefficient of the power transmission cable in the ith area in one data acquisition is smaller, which means that the temperature data acquired under the condition has smaller deviation;
and the present embodiment provides a temperature after correction of the power transmission cable in the i-th region in one data acquisition Can pass through the formulaThe temperature deviation coefficient gamma i of the power transmission cable in the ith area in the one-time data acquisition is combined, so that the corrected temperature can be calculated, the temperature is closer to the actual condition, and accurate data support is provided for whether the cable has abnormal state or not in the follow-up process.
Through the arrangement, after the temperature measuring optical fiber and the information data of the transmission cable are combined, the temperature deviation coefficient of the power transmission cable in the ith area in one data acquisition 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, the temperature corrected by the power transmission cable in the ith area is calculated based on the data, the calculated temperature data can be more attached to the actual data, the reliability and the accuracy of the temperature data are improved, the subsequent larger deviation in cable fault monitoring is avoided, and the accuracy of a detection result is ensured.
The correction process of the temperature correction evaluation module further comprises the following steps:
By modifying the temperature of the power transmission cable in all areas Respectively with preset cable temperature threshold valuesComparing;
If any one of Greater thanThe system judges that the temperature of the power transmission cable in the area is abnormal, the cable is possibly damaged, and early warning is sent to a background manager in time;
If all are Are all smaller thanThe system judges that the temperatures of the power transmission cables in all areas are normal, the condition that the cables are damaged is avoided, and the system combines the data of the operation state monitoring module to further analyze;
Through the technical scheme, the temperature of the power transmission cable in all areas is corrected Respectively with preset cable temperature threshold valuesThe method comprises the steps of comparing, accurately judging whether the cable is damaged according to the temperature of the power transmission cable, deciding whether to send out early warning to a background manager or further analyze the data of the operation state monitoring module according to the judging result, so that the accuracy and the reliability of the cable fault monitoring result are improved, and analyzing the cable states in different areas by the analyzing method, so that when the cable is judged to be possibly damaged, quick positioning can be realized, and the overhaul efficiency is improved;
The preset cable temperature threshold value is as follows The settings may be fitted based on empirical data.
The data monitored by the running state monitoring module comprises the current value, the resistance value and the voltage value of the cable in the running process;
Through the technical scheme, the embodiment provides the data monitored by the operation state monitoring module, the data reflect the state of the cable in the operation process, and the sensitivity of the follow-up monitoring on the cable faults can be improved by combining the data of the dimension, so that the accuracy of the monitoring result is improved.
The processing procedure of the data processing module comprises the following steps:
by the formula Calculating to obtain a discrete coefficient r of the cable temperature in all areas;
Wherein n is the total number of the areas divided by the area dividing module, For all ofG is a second scaling factor, set by empirical fit,For all ofMaximum value of (2);
through the technical scheme, the embodiment provides the discrete coefficient r of the cable temperature in all areas, and the discrete coefficient r can be calculated by the formula The calculation method can judge the temperature distribution condition of the whole cable, when the discrete coefficient r of the cable temperature in all the areas is lower, the temperature difference in each area of the whole cable is smaller, the use condition in each area of the cable is almost the same, the condition that an abnormality or a cable damage exists in a certain area does not exist, when the discrete coefficient r of the cable temperature in the area is higher, the temperature difference in each area of the whole cable is larger, the use condition in each area of the cable is different, the possibility that an inconspicuous abnormality or a smaller damage exists in a part of the area is different, and through the arrangement, the discrete coefficient of the cable temperature in all the areas is related with the abnormality or the damage condition of the cable in a dense and indistinct manner, so the data can provide data support for the subsequent judgment of the risk of the cable running state, thereby improving the accuracy and the reliability of the cable fault monitoring result.
The processing procedure of the data processing module further comprises the following steps:
by the formula Calculating and obtaining an operation risk coefficient delta ai of the power transmission cable in the ith area at the a-th time point;
Wherein a is one data monitoring at fixed time intervals, yl ai is the pressure applied to the power transmission cable in the ith area at the a-th time point, yl y is the pressure applied to the preset cable, dl ai is the current magnitude of the power transmission cable in the ith area 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 ith area 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 ith area at the a-th time point, For the average value of all dy ai, dy b is the standard value of dy ai, which can be selectively set according to the allowable error in the empirical data;
Through the above technical solution, the present embodiment provides the running risk factor δ ai of the power transmission cable in the ith area at the a-th time point, which can be calculated by the formula The calculation results, wherein,It can be calculated to obtain the fluctuation value of the voltage of the power transmission cable in all the regions at the a-th time point, so it can be seen that when the voltage of the power transmission cable in the i-th region is larger and the fluctuation value of the voltage of the current, the resistance and the power transmission cable in all the regions at the a-th time point is higher, the risk of operation of the power transmission cable in the i-th region at the a-th time point is larger, whereas when the voltage of the power transmission cable in the i-th region is smaller and the fluctuation value of the voltage of the current, the resistance and the power transmission cable in all the regions at the a-th time point is lower, the risk of operation of the power transmission cable in the i-th region at the a-th time point is smaller;
By the calculation method, after the state data of the cable in the operation process, the temperature deviation coefficient gamma i of the power transmission cable in the ith area in one-time data acquisition, the discrete coefficient r of the cable temperature in all areas and other diversified data are combined, the accuracy and reliability of the calculation result of the operation risk coefficient of the power transmission cable in the ith area at the a-th time point can be improved, so that accurate and powerful data support is provided for judging the cable operation state in the follow-up process, and the accuracy of the monitoring result is improved.
The analysis process of the data analysis module comprises the following steps:
Comparing the running risk coefficient delta ai of the power transmission cables in all areas at the a-th time point with a preset risk coefficient threshold delta z;
if all delta ai is smaller than delta z, the system judges that the running risk coefficient of the whole power transmission cable at the a-th time point is small, the running state of the whole cable is stable, and no fault or abnormal running condition exists;
If any delta ai is larger than delta z, the system judges that the running risk coefficient of the power transmission cable in the area at the a-th time point is too large, the running state of the whole cable is unstable, further judges that the electronic transmission cable in the area is possibly damaged or abnormal, and timely gives an early warning to remind a background manager to maintain;
According to the technical scheme, the operation risk coefficient delta ai of the power transmission cables in all the areas at the a-th time point is compared with the preset risk coefficient threshold delta z, and as the data for analysis and comparison have higher accuracy and reliability, accurate judgment can be made on the operation risk coefficient of each area of the power transmission cables at the a-th time point according to the comparison result, so that the stability of the whole operation state of the cables is judged, and early warning is timely made when the electronic transmission cables in the area are judged to be possibly damaged or abnormal, so that the overhaul efficiency is improved;
it should be noted that the preset risk factor threshold δ z may be set by fitting according to empirical data.
The foregoing describes one embodiment of the present invention in detail, but the description is only a preferred embodiment of the present invention and should not be construed as limiting the scope of the invention. All equivalent changes and modifications within the scope of the present invention are intended to be covered by the present invention.
Claims (8)
1. A fiber optic sensor-based power transmission equipment fault monitoring system, the system comprising:
The data acquisition module comprises a cable data acquisition unit and an optical fiber data acquisition unit, wherein the cable data acquisition unit is used for acquiring data information of the power transmission cable;
the optical fiber data acquisition unit is used for acquiring optical fiber material data of the temperature measuring optical fiber;
The area dividing module is used for dividing the optical cable into a plurality of monitoring areas with the same length according to the length of the optical cable;
the running state monitoring module is used for collecting state data of the power transmission cable in the running process;
The temperature correction evaluation module is used for correcting the temperature data of the cable monitored by the temperature measuring optical fiber by combining the data acquired by the data acquisition module, analyzing the corrected temperature, and carrying out preliminary evaluation on the operation state of the cable;
The data processing module is used for combining the data of the temperature correction module and the data obtained by monitoring of the running state monitoring module to calculate the real-time running state risk coefficient of the power transmission cable;
the data analysis module is used for comparing the risk coefficient of the real-time operation state of the power transmission cable with a preset risk coefficient threshold value and analyzing the operation state of the cable according to a comparison result.
2. The optical fiber sensor-based power transmission equipment fault monitoring system according to claim 1, wherein the data information of the power transmission cable comprises cable insulation layer thickness and pressure applied to the cable in different areas, and the optical fiber material data of the temperature measuring optical fiber comprises fiber core diameter, bending degree in different areas and optical fiber material.
3. The optical fiber sensor-based power transmission equipment fault monitoring system according to claim 2, wherein the correction process of the temperature correction evaluation module comprises:
by the formula Calculating to obtain a temperature deviation coefficient gamma i of the power transmission cable in the ith area in the primary data acquisition;
And pass through the formula Calculating to obtain the corrected temperature theta i of the power transmission cable in the ith area in the primary data acquisition;
Wherein i is any region divided by the region dividing module, zj is the core diameter of the temperature measuring optical fiber, zj y and the preset core diameter, wq i is the curvature of the temperature measuring optical fiber in the ith region in one-time data acquisition, wq y is the preset curvature, sigma is the temperature measuring optical fiber manufacturing material influence coefficient, hd is the outer layer thickness of the power transmission cable according to empirical fit setting, hd y is the preset outer layer thickness, hd b is the standard value of hd, f q (x) is a defined function, f q (x) = (x) is made when (x) is more than or equal to 1, otherwise, f q (x) = (x) is made to be 1, rho is the power transmission cable manufacturing material influence coefficient according to empirical fit setting, wd y is the preset outdoor temperature in one-time data acquisition, wd is the outdoor temperature in one-time, x1 and x2 is the weight coefficient, Q is the first ratio coefficient according to empirical fit setting, and ω is the original temperature value monitored in one-time data acquisition.
4. A power transmission equipment fault monitoring system based on an optical fiber sensor according to claim 3, wherein the correction process of the temperature correction evaluation module further comprises:
The corrected temperatures theta i of the power transmission cables in all the areas are respectively compared with a preset cable temperature threshold theta z;
If any theta i is larger than theta z, the system judges that the temperature of the power transmission cable in the area is abnormal, the cable is possibly damaged, and early warning is sent to a background manager in time;
if all the theta i are smaller than the theta z, the system judges that the temperatures of the power transmission cables in all the areas are normal, the condition that the cables are damaged is avoided, and the further analysis is carried out by combining the data of the operation state monitoring module.
5. The optical fiber sensor-based power transmission equipment fault monitoring system according to claim 4, wherein the data monitored by the operation state monitoring module comprises a current value, a resistance value and a voltage value of the cable in the operation process.
6. The optical fiber sensor-based power transmission equipment fault monitoring system according to claim 5, wherein the processing procedure of the data processing module comprises:
by the formula Calculating to obtain a discrete coefficient r of the cable temperature in all areas;
Wherein n is the total number of the areas divided by the area dividing module, For the average value of all theta i, g is the second scaling factor, set by empirical fit,Is the maximum of all θ i.
7. The optical fiber sensor-based power transmission equipment fault monitoring system of claim 6, wherein the processing of the data processing module further comprises:
by the formula Calculating and obtaining an operation risk coefficient delta ai of the power transmission cable in the ith area at the a-th time point;
Wherein a is one data monitoring at fixed time intervals, yl ai is the pressure applied to the power transmission cable in the ith area at the a-th time point, yl y is the pressure applied to the preset cable, dl ai is the current magnitude of the power transmission cable in the ith area 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 ith area 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 ith area at the a-th time point, Dy b is a standard value of dy ai, which is the average value of all dy ai.
8. The optical fiber sensor-based power transmission equipment fault monitoring system of claim 7, wherein the analysis process of the data analysis module comprises:
Comparing the running risk coefficient delta ai of the power transmission cables in all areas at the a-th time point with a preset risk coefficient threshold delta z;
if all delta ai is smaller than delta z, the system judges that the running risk coefficient of the whole power transmission cable at the a-th time point is small, the running state of the whole cable is stable, and no fault or abnormal running condition exists;
If any delta ai is larger than delta z, the system judges that the running risk coefficient of the power transmission cable in the area at the a-th time point is too large, the running state of the whole cable is unstable, further judges that the electronic transmission cable in the area is possibly damaged or abnormal, and timely gives an early warning to remind a background manager to maintain.
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