CN114842603A - High tension cable prevents outer broken monitoring and early warning system - Google Patents
High tension cable prevents outer broken monitoring and early warning system Download PDFInfo
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- CN114842603A CN114842603A CN202210433519.3A CN202210433519A CN114842603A CN 114842603 A CN114842603 A CN 114842603A CN 202210433519 A CN202210433519 A CN 202210433519A CN 114842603 A CN114842603 A CN 114842603A
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/02—Mechanical actuation
- G08B13/12—Mechanical actuation by the breaking or disturbance of stretched cords or wires
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
- G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/02—Mechanical actuation
- G08B13/12—Mechanical actuation by the breaking or disturbance of stretched cords or wires
- G08B13/122—Mechanical actuation by the breaking or disturbance of stretched cords or wires for a perimeter fence
- G08B13/124—Mechanical actuation by the breaking or disturbance of stretched cords or wires for a perimeter fence with the breaking or disturbance being optically detected, e.g. optical fibers in the perimeter fence
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/124—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wired telecommunication networks or data transmission busses
Abstract
The invention discloses a high-voltage cable external damage prevention monitoring and early warning system, which comprises: the system comprises an optical fiber sensor, an analysis monitoring module and a system early warning platform; the optical fiber sensor and the high-voltage cable are laid in the same channel and used for representing the high-voltage cable to sense external damage; the analysis monitoring module is connected with the optical fiber sensor and is used for analyzing and monitoring optical fiber vibration of the optical fiber sensor caused by external damage; the system early warning platform is connected with the analysis detection module and used for identifying the external damage event information and the external damage position of the high-voltage cable and sending early warning information. By utilizing the embodiment of the invention, the external damage monitoring and early warning efficiency can be improved.
Description
Technical Field
The invention belongs to the technical field of data monitoring, and particularly relates to an external-damage-prevention monitoring and early-warning system for a high-voltage cable.
Background
High-voltage cables of the direct-buried or through-pipe laying type are generally buried directly in the ground, and besides the self-manufacturing quality or the underground corrosion, an important factor causing damage to the high-voltage cables is artificial mechanical external force damage. Due to the fact that protection consciousness of power facilities of part of construction units is thin and the large-scale construction machines such as pipe-jacking machines, pile-driving machines and crushers often damage the high-voltage cable body, the cable body is damaged to different degrees, and line tripping is caused seriously.
At present, for supervision of high-voltage cable line construction, operation and maintenance units mainly adopt modes of manual irregular inspection, publicity material distribution, safety settlement agreement signing and the like, inspection personnel need to complete specified inspection and elimination work every month, so that blind areas of inspection periods exist, early warning of hidden dangers cannot be realized, and therefore the traditional operation and maintenance modes cannot achieve expected effects, and wild construction is still plentiful. The simple video monitoring device is installed in some construction places, real-time supervision of a construction site is enhanced to a certain extent, but the method can only realize monitoring of a limited range of fixed construction points, a power supply mode of solar energy and a storage battery is adopted in the field, the influence of weather factors is large, external broken hidden danger information needs to be found manually and actively for early warning in most cases, certain limitation exists, and the external broken monitoring efficiency is low.
Disclosure of Invention
The invention aims to provide an external damage prevention monitoring and early warning system for a high-voltage cable, which is used for solving the defects in the prior art and improving the external damage prevention monitoring and early warning efficiency.
An embodiment of the present application provides a high tension cable prevents outer broken monitoring and early warning system, the system includes: the system comprises an optical fiber sensor, an analysis monitoring module and a system early warning platform;
the optical fiber sensor and the high-voltage cable are laid in the same channel and used for representing the high-voltage cable to sense external damage;
the analysis monitoring module is connected with the optical fiber sensor and is used for analyzing and monitoring optical fiber vibration of the optical fiber sensor caused by external damage;
the system early warning platform is connected with the analysis detection module and used for identifying the external damage event information and the external damage position of the high-voltage cable and sending early warning information.
Optionally, the optical fiber sensor includes: 1-core vacant single-mode optical fiber containing the communication service optical cable is laid.
Optionally, the analyzing and monitoring module includes: and analyzing the monitoring host.
Optionally, the external damage event information includes: the high-voltage cable external damage corresponds to the signal type of the optical fiber vibration and the external damage event level.
Optionally, the signal type is identified by:
judging the amplitude of the acquired signal, and filtering the signal of which the intensity of the amplitude is greater than a preset value;
carrying out frequency spectrum and signal width analysis on the filtered signals to obtain the characteristics of frequency domain signals;
and comparing the characteristics of the frequency domain signals with the characteristics of historical signals, and classifying the signals to realize the identification of the signal types.
Optionally, the signal types include: a crusher, an excavator, a pipe jacking machine, an exploration machine, a pile driver, a handheld machine or a vibration signal for down-hole pipe penetrating operation.
Optionally, the system further includes: the system early warning platform sends early warning information to the wireless terminal through the wireless communication module.
Optionally, the wireless communication module includes: APN private network card.
Optionally, the location of the break-out is determined by the following formula:
L＝c*At/2n
wherein, L is the distance apart from the vibration distance of optic fibre starting point, c is the speed of light in the vacuum, At is the transmission time of pulse optical signal, n is the refracting index of optic fibre.
Optionally, the system early warning platform is further configured to display an optical fiber path diagram, query and count historical external damage event information, where the optical fiber path diagram includes: and (5) calibrating the optical fiber route.
Compared with the prior art, the invention provides an external damage prevention monitoring and early warning system for a high-voltage cable, which comprises: the system comprises an optical fiber sensor, an analysis monitoring module and a system early warning platform; the optical fiber sensor and the high-voltage cable are laid in the same channel and used for representing the high-voltage cable to sense external damage; the analysis monitoring module is connected with the optical fiber sensor and is used for analyzing and monitoring optical fiber vibration of the optical fiber sensor caused by external damage; the system early warning platform is connected with the analysis detection module and used for identifying the outer broken event information and the outer broken position of the high-voltage cable and sending early warning information.
Drawings
Fig. 1 is a schematic structural diagram of a high-voltage cable external damage prevention monitoring and early warning system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another high-voltage cable anti-external-damage monitoring and early-warning system according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another high-voltage cable anti-external-damage monitoring and early warning system according to an embodiment of the present invention.
Detailed Description
The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.
The invention designs and applies a high-voltage cable anti-external-damage monitoring and early warning system based on distributed optical fiber vibration sensing, which does not need to install other equipment along a pipeline, intelligently identifies the mechanical external-damage type of the whole high-voltage cable by using a vibration signal of optical fibers laid in the same ditch with the high-voltage cable, and actively sends early warning information.
As shown in fig. 1, an embodiment of the present invention provides a high voltage cable anti-external damage monitoring and early warning system, which may include: the system comprises an optical fiber sensor 101, an analysis monitoring module 102 and a system early warning platform 103;
the optical fiber sensor 101 is laid in the same channel with the high-voltage cable and used for representing the high-voltage cable to sense external damage. When the high-voltage cable is damaged by external machinery, the optical fiber is damaged equally, and the external damage of the high-voltage cable is monitored by monitoring the optical fiber.
Specifically, the optical fiber sensor may include: 1-core vacant single-mode optical fiber containing the communication service optical cable is laid.
Compared with the traditional electrical sensor, the optical fiber sensor has the advantages of high measurement precision, strong electromagnetic interference resistance, light material, good channel safety, long measurement distance, continuous distributed measurement and the like. The detection optical fiber is buried or laid in a monitored structure such as a high-voltage cable, and various physical information such as temperature, stress, strain and the like of the structure body is obtained through optical signals, so that the real-time monitoring of abnormal conditions is realized.
The analyzing and monitoring module 102 is connected to the optical fiber sensor and configured to analyze and monitor optical fiber vibration of the optical fiber sensor caused by an external break.
Specifically, the analyzing and monitoring module includes: and analyzing the monitoring host.
The system early warning platform 103 is connected with the analysis detection module, and is used for identifying the external damage event information and the external damage position of the high-voltage cable and sending early warning information.
Specifically, the system early warning platform is further used for inquiring and counting historical external damage event information.
Specifically, the external damage event information includes: the high-voltage cable external damage corresponds to the signal type of the optical fiber vibration and the external damage event level. The signal type may be identified by:
judging the amplitude of the acquired signal, and filtering the signal of which the intensity of the amplitude is greater than a preset value;
carrying out frequency spectrum and signal width analysis on the filtered signals to obtain the characteristics of frequency domain signals;
and comparing the characteristics of the frequency domain signals with the characteristics of historical signals, and classifying the signals to realize the identification of the signal types.
Illustratively, the amplitude values a, B and C of the collected signal A, B, C are 1, 2 and 3 in corresponding strength, assuming that the preset value is 1.5, the signal B, C is filtered, the features j and k are obtained through analysis, and compared with the historical signal features in the system database, the historical signal X, Y corresponding to the features j and k is obtained, the category of the signal B is the category of the historical signal X (assumed to be p type), and the category of the signal C is the category of the historical signal Y (assumed to be q type).
Specifically, the signal types include, but are not limited to: a crusher, an excavator, a pipe jacking machine, an exploration machine, a pile driver, a handheld machine or a vibration signal for down-hole pipe penetrating operation.
Illustratively, the whole system can be composed of a distributed optical fiber vibration sensing analysis host, a monitoring host and a system early warning platform, and host equipment is all installed in the same screen cabinet of a transformer substation communication room. The analysis monitoring host machine can realize all-weather monitoring of the broken hidden danger of the high-voltage cable laid in the same ditch along the line by using the 1-core vacant single-mode optical fiber laid in the optical cable containing the communication service in the pipeline, and does not need to lay 1 multimode optical fiber again for transmitting and sensing the vibration signal.
The external force damage prevention technology for distributed optical fiber sensing has the following characteristics that 1, a line is free from installation along the way, and 1 core of spare optical fiber in a communication optical cable is taken as a sensing and transmission channel to be accessed into an analysis monitoring host; 2, the whole line construction is free of blind spots, and external force damage monitoring of the whole line high-voltage cable is achieved; 3, the system is simple in structure, only a monitoring host and an analysis host need to be installed in a substation communication room, and no additional sensor needs to be installed on a line; 4, a complete early warning system, namely, when a large machine which is working is arranged near the optical cable, the system sends out early warning, sets and distinguishes warning levels according to different threshold values, and only records the hidden danger event of external damage without sending out early warning short messages if the large machine advances near the optical cable or is crossed with the optical cable route in short time; the vibration signals of crushers, excavators, pipe lifters, prospecting machines, pile drivers, handheld machines (pneumatic picks and the like) and underground pipe penetrating operation can be identified, and the advancing and operating signals of large-scale construction machinery can be accurately distinguished.
Specifically, the outer broken position is determined by the following formula:
L＝c*At/2n
wherein, L is the distance apart from the vibration distance of optic fibre starting point, c is the speed of light in the vacuum, At is the transmission time of pulse optical signal, n is the refracting index of optic fibre.
Because different scattering effects can be generated due to different microscopic effects when light waves are transmitted in the optical fiber, the light waves are divided into Rayleigh scattering, Brillouin scattering and Raman scattering according to different wavelengths and respectively correspond to distributed optical fiber sensors with different functions. The distributed optical fiber vibration sensing technology utilizes an interference mechanism of optical time domain reflection to test external disturbance, the external disturbance generates vibration near an optical fiber to cause the phase of Rayleigh scattering light of the optical fiber to change, the light phase change caused by the optical interference effect causes the light intensity to change, and the position of a vibration signal can be positioned by monitoring the interference effect of backward Rayleigh scattering at different moments in real time. This kind of localized monitoring based on optical time domain reflection technology and fiber interference technology is also called as Φ -OTDR technology, and the vibration position is related to the transmission time of the pulse optical signal injected into the fiber, as shown in the above formula. The vibration monitoring system of the phi-OTDR technology not only can realize the positioning of the vibration position, but also can extract a plurality of information of the vibration position for analyzing the vibration signal and identifying the characteristics.
The system takes the vacant fiber core resources in the original optical fiber laid in the same ditch with the high-voltage cable as a sensor to realize the multi-point measurement of the whole optical fiber. When external vibration acts on the position near the optical fiber, the wire core is deformed, the length and the refractive index of the wire core are changed, and the phase of light in the optical fiber is changed. When light is transmitted in the optical fiber, the dry photons and the core lattices act to continuously transmit backward Rayleigh scattering light, the backward Rayleigh scattering light is analyzed by using an optical detector, the relation between the multi-parameter characteristics of the optical signal and a vibration event is analyzed by data processing means such as amplitude judgment, spectrum analysis, mode identification, characteristic extraction and the like of a vibration signal, a data relation corresponding model is established, whether the optical fiber is subjected to external damage or not and the signal state of the optical fiber can be identified and judged, and therefore the external damage of the high-voltage cable laid in the same ditch is monitored. And finally, combining vibration signal positioning information according to an intelligent recognition early warning result to give a treatment suggestion of the external damage of the construction machinery.
The process of monitoring the vibration signal is carried out by utilizing the phi-OTDR technology, and the phase demodulation is completed by utilizing the interference between backward Rayleigh scattering light generated by pulse detection light waves in a cable core, so that the vibration information extraction is realized.
Further, as shown in fig. 2, the system may further include: the system early warning platform 103 sends early warning information to the wireless terminal 104 through the wireless communication module 105.
Specifically, the wireless communication module includes: APN private network card, wireless terminal includes: provided is a mobile phone.
The display content of the background software interface of the high-voltage cable external damage prevention monitoring and early warning platform mainly comprises an optical cable (optical fiber) path diagram and event information. The optical cable path diagram is the optical cable route calibrated by the system and marks the external force damage event level and the specific position; the event information is a detailed information list of the corresponding external damage event, and comprises functions of historical event information query, statistical analysis and the like.
The system can establish an intelligent recognition analysis model by combining the collected signal parameter values (frequency, amplitude, interval and the like) with a statistical method. Firstly, signals with larger strength are filtered out by judging the amplitude of the signals, and the signals can be caused by external force damage events of large-scale mechanical construction; then, carrying out spectrum and signal width analysis on the signals possibly with the external damage hidden danger, and classifying the signals according to the characteristics of the frequency domain signals and the comparison with the characteristics of historical signals; and finally, for the classified signals, namely the signals which are already identified, the signal classification can be further obtained by analyzing statistical characteristic values for the signals which are not identified.
The system planning arranges the display platform through an internal network or an external network, and by taking the power internal network display platform as an example, after the distributed external damage (analysis) monitoring host equipment is installed in a transformer substation communication room, the Web webpage of a power monitoring center can access the external damage prevention monitoring and early warning system platform through the in-station comprehensive data network connection, and the detailed information of the external damage hidden danger points can be checked. Meanwhile, by configuring the APN special network card on the system communication module, forenotice warning information can be sent to a computer WEB end, a mobile phone or an APP of operation and maintenance personnel of the anti-external-damage monitoring system using team, and the operation and maintenance personnel give a processing method according to the warning level. The system not only realizes the state monitoring of the whole-line high-voltage cable, but also plays a role in early warning of external damage, is beneficial to timely mastering whether the high-voltage cable is subjected to external damage or not and the danger level, and is exemplarily shown in fig. 3.
Field verification and practical application: in order to verify whether the system can detect the vibration signal of the high-voltage cable laid in the same ditch with the optical cable and eliminate the interference to accurately position, a calibration test of the optical cable route can be carried out. And respectively selecting a starting point 275m and an end point 4132m of a certain 110kV high-voltage cable laid in the same ditch as test points, and carrying out an analog vibration signal test by using a standard vibration source. The state of the optical cable is judged through the vibration signal, namely, a mechanical external force vibration signal and the position of the mechanical external force vibration signal of the high-voltage cable laid in the same ditch along the line are collected.
The 275m detection signal frequency domain of the simulated vibration test has fewer test interference signals, better test effect and more obvious frequency spectrum characteristics of the simulated vibration signal, and contains a fixed frequency of 48Hz and a frequency doubling signal thereof.
The characteristics of the simulated vibration signal are clearly visible at 4312m, a frequency line spectrum is obvious, and the test position of the vibration signal, namely 4132m of the length of the high-voltage cable, can be easily identified and positioned.
In practical application, when the high-voltage cable corridor is subjected to mechanical vibration construction on site, a system background finds and alarms construction hidden danger points, and sends early warning short messages of construction external damage to inform operation and maintenance personnel, and the operation and maintenance personnel confirm and prevent the construction hidden danger above a line which possibly damages the normal operation of the high-voltage cable on site according to the early warning level.
The field verification and application effects show that the high-voltage cable anti-external-damage monitoring and early warning system based on the distributed optical fiber vibration sensing can accurately identify whether the high-voltage cable is damaged by external force and position the position point of the high-voltage cable, and can judge the type and the level of the hidden danger of the external force damage through mode identification, thereby early warning of the high-voltage cable external-damage event can be realized. The system can realize accurate positioning of the outer broken vibration signal by utilizing the phi-OTDR technology, can perform pre-alarm according to the classification of the identification result, avoids false alarm of short-time invalid events as far as possible, and forms perfect outer broken information visual controllability.
By applying the system, the special monitoring means of all-weather high-voltage cable line states is added to the high-voltage cable line operation and maintenance personnel on the basis of daily inspection, the operation and maintenance management personnel can make decisions according to the levels of the early warning information prompted by the system and quickly arrive at the site to perform safety investigation or inform the site personnel to stop destructive construction, the external damage prevention efficiency is effectively improved, and the operation and maintenance management level of the high-voltage cable is also improved to a certain extent. Along with the urban renovation and transformation and the expansion of urban area range, the demand of transforming overhead lines into high-voltage cables is increasing, and meanwhile, the municipal engineering construction and transformation are also increasing year by year, the environment of the high-voltage cables suffering from external damage is worse and worse, and the application of effective high-voltage cables for external damage prevention monitoring and early warning is very critical for specific situations.
Therefore, the invention provides an external-damage-prevention monitoring and early-warning system for a high-voltage cable, which comprises: the system comprises an optical fiber sensor, an analysis monitoring module and a system early warning platform; the optical fiber sensor and the high-voltage cable are laid in the same channel and used for representing the high-voltage cable to sense external damage; the analysis monitoring module is connected with the optical fiber sensor and is used for analyzing and monitoring optical fiber vibration of the optical fiber sensor caused by external damage; the system early warning platform is connected with the analysis detection module and used for identifying the outer broken event information and the outer broken position of the high-voltage cable and sending early warning information.
The construction, features and functions of the present invention are described in detail in the embodiments illustrated in the drawings, which are only preferred embodiments of the present invention, but the present invention is not limited by the drawings, and all equivalent embodiments modified or changed according to the idea of the present invention should fall within the protection scope of the present invention without departing from the spirit of the present invention covered by the description and the drawings.
Claims (10)
1. The utility model provides a broken monitoring early warning system outward is prevented to high tension cable which characterized in that, the system includes: the system comprises an optical fiber sensor, an analysis monitoring module and a system early warning platform;
the optical fiber sensor and the high-voltage cable are laid in the same channel and used for representing the high-voltage cable to sense external damage;
the analysis monitoring module is connected with the optical fiber sensor and is used for analyzing and monitoring optical fiber vibration of the optical fiber sensor caused by external damage;
the system early warning platform is connected with the analysis detection module and used for identifying the external damage event information and the external damage position of the high-voltage cable and sending early warning information.
2. The system of claim 1, wherein the fiber optic sensor comprises: 1-core vacant single-mode optical fiber containing the communication service optical cable is laid.
3. The system of claim 1, wherein the analytic monitoring module comprises: and analyzing the monitoring host.
4. The system of claim 1, wherein the breach event information comprises: the high-voltage cable external damage corresponds to the signal type of the optical fiber vibration and the external damage event level.
5. The system of claim 4, wherein the signal type is identified by:
judging the amplitude of the acquired signal, and filtering the signal of which the intensity of the amplitude is greater than a preset value;
carrying out frequency spectrum and signal width analysis on the filtered signals to obtain the characteristics of frequency domain signals;
and comparing the characteristics of the frequency domain signals with the characteristics of historical signals, and classifying the signals to realize the identification of the signal types.
6. The system of claim 4, wherein the signal types comprise: a crusher, an excavator, a pipe jacking machine, an exploration machine, a pile driver, a handheld machine or a vibration signal for down-hole pipe penetrating operation.
7. The system of claim 1, further comprising: the system early warning platform sends early warning information to the wireless terminal through the wireless communication module.
8. The system of claim 6, wherein the wireless communication module comprises: APN private network card.
9. The system of claim 2, wherein the breach location is determined by the formula:
L＝c*At/2n
wherein, L is the distance apart from the vibration distance of optic fibre starting point, c is the speed of light in the vacuum, At is the transmission time of pulse optical signal, n is the refracting index of optic fibre.
10. The system of claim 1, wherein the system pre-warning platform is further configured to display a fiber path graph, query and count historical outburst event information, the fiber path graph comprising: and (5) calibrating the optical fiber route.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115346357A (en) * | 2022-10-18 | 2022-11-15 | 高勘(广州)技术有限公司 | Early warning method, device and equipment for preventing external damage of optical cable and storage medium |
| CN115359642A (en) * | 2022-10-18 | 2022-11-18 | 高勘(广州)技术有限公司 | External damage prevention early warning method, device, equipment and storage medium by using optical cable |
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| JP2001221684A (en) * | 2000-02-08 | 2001-08-17 | Fujikura Ltd | Method and apparatus for detection and judgment of vibration using optical fiber cable, and as system for detection and judgment of vibration |
| CN110716102A (en) * | 2019-09-10 | 2020-01-21 | 广州供电局有限公司 | High-voltage cable external-damage-prevention monitoring and early-warning method and monitoring and early-warning system |
| CN211824710U (en) * | 2019-09-10 | 2020-10-30 | 广东电网有限责任公司广州供电局 | High-voltage cable external-damage-prevention monitoring and early-warning system |
| CN113820039A (en) * | 2021-10-27 | 2021-12-21 | 北京国网富达科技发展有限责任公司 | Distributed optical fiber temperature measurement and external damage prevention monitoring equipment and external damage prevention early warning method |
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| CN115346357A (en) * | 2022-10-18 | 2022-11-15 | 高勘(广州)技术有限公司 | Early warning method, device and equipment for preventing external damage of optical cable and storage medium |
| CN115359642A (en) * | 2022-10-18 | 2022-11-18 | 高勘(广州)技术有限公司 | External damage prevention early warning method, device, equipment and storage medium by using optical cable |
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