CN111189485A - System for monitoring icing state of optical fiber composite ground wire of power transmission line - Google Patents
System for monitoring icing state of optical fiber composite ground wire of power transmission line Download PDFInfo
- Publication number
- CN111189485A CN111189485A CN202010197438.9A CN202010197438A CN111189485A CN 111189485 A CN111189485 A CN 111189485A CN 202010197438 A CN202010197438 A CN 202010197438A CN 111189485 A CN111189485 A CN 111189485A
- Authority
- CN
- China
- Prior art keywords
- optical fiber
- ground wire
- composite ground
- fiber composite
- monitoring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000013307 optical fiber Substances 0.000 title claims abstract description 142
- 239000002131 composite material Substances 0.000 title claims abstract description 70
- 230000005540 biological transmission Effects 0.000 title claims abstract description 37
- 238000012544 monitoring process Methods 0.000 title claims abstract description 37
- 239000011248 coating agent Substances 0.000 claims description 14
- 238000000576 coating method Methods 0.000 claims description 14
- 230000008859 change Effects 0.000 claims description 13
- 238000000611 regression analysis Methods 0.000 claims description 6
- 238000009826 distribution Methods 0.000 claims description 4
- 238000013178 mathematical model Methods 0.000 claims description 4
- 238000009413 insulation Methods 0.000 claims description 3
- 239000012212 insulator Substances 0.000 claims description 3
- 238000002955 isolation Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 6
- 230000003287 optical effect Effects 0.000 abstract description 4
- 238000004891 communication Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 12
- 238000011156 evaluation Methods 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000007619 statistical method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000012417 linear regression Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010606 normalization Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention discloses a monitoring system for the icing state of an optical fiber composite ground wire of a power transmission line, which comprises: the distributed optical fiber acoustic sensing demodulator is used for emitting optical pulses and demodulating phases of reflected Rayleigh scattering light; an optical fiber composite ground wire; the distributed optical fiber sensor is used for monitoring the strain parameters of each measuring point of the optical fiber composite ground wire; the computer system is used for receiving the strain parameters of each measuring point of the distributed optical fiber sensor sent by the distributed optical fiber acoustic sensing demodulator; a power transmission tower; the invention has no power supply unit, the service life of the monitoring equipment is not limited by severe environment, and the stability of the equipment is high; taking an optical fiber inside an OPGW optical cable erected by a line as a sensing optical fiber; meanwhile, no extra communication cost exists, and the information security is high; the light is used as a sensing medium, so that the electromagnetic interference is resisted, and the data measurement is accurate; the monitoring distance is long and distributed monitoring is realized.
Description
Technical Field
The invention relates to the technical field of power transmission lines, in particular to a monitoring system for the icing state of an optical fiber composite ground wire of a power transmission line.
Background
The electric power system is a complex large system, comprehensive reliability evaluation is a key technology and is also an important component of reliability engineering, reliability evaluation is a process of estimating the performance index of the reliability of the evaluation system by utilizing a statistical method and means according to the reliability structure, the service life model and test information of equipment, and the reliability evaluation of the complex large system is always difficult due to the main reasons of technology, cost, test organization and the like, the distributed optical fiber sensing system can measure physical parameters such as stress, good vibration temperature and the like along sensing optical fibers, an advanced technical means is provided for the reliability evaluation of the complex large system, the distribution state of the dynamic tension of the high-voltage transmission line composite ground wire can be monitored through the distributed optical fiber sensing system, and the resolution reaches 1 m; the icing can cause the tension change of the optical fiber composite ground wire, the icing waving of the optical fiber composite ground wire can occur under the action of meteorological conditions, the optical fiber composite ground wire can show the alternating change of the dynamic tension, and the monitoring of the icing state of the composite ground wire of the power transmission line is realized through the statistical analysis of the dynamic tension.
However, at present, the monitoring of the icing state of domestic power transmission lines is mainly realized by a weighing/tension sensor, a lead temperature/inclination angle sensor, image monitoring and the like; the weighing/tension sensor and the wire temperature/inclination angle sensor for monitoring the icing state of the existing power transmission line are both electric measuring sensors, have the characteristics of nonlinearity, zero drift, creep deformation and the like, have unstable measuring results, short service life and poor reliability, and are easily interfered by strong electromagnetic environment around the power transmission line; the image monitoring method is adopted, and the image identification method has huge calculation amount, so that image data needs to occupy a large number of power communication channels; in addition, under the condition of large wind and snow, snow flakes and ice coating easily cover the lens of the monitor, so that the ice coating condition of the lead cannot be accurately distinguished, and the reliability of the CCD/COMS imaging system under the severe environment is poor.
Disclosure of Invention
The invention aims to provide a monitoring system for the icing state of an optical fiber composite ground wire of a power transmission line, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: transmission line optical fiber composite ground wire icing state monitoring system includes:
the distributed optical fiber acoustic sensing demodulator is used for emitting optical pulses and demodulating phases of reflected Rayleigh scattering light;
an optical fiber composite ground wire;
the distributed optical fiber sensor is used for monitoring the strain parameters of each measuring point of the optical fiber composite ground wire;
the computer system is used for receiving the strain parameters of each measuring point of the distributed optical fiber sensor sent by the distributed optical fiber acoustic sensing demodulator;
a power transmission tower;
the distributed optical fiber acoustic sensing demodulator is fixedly installed on one side of the top end of the power transmission tower, and the optical fiber composite ground wire is fixedly installed on the top end of the power transmission tower.
Preferably, the distributed optical fiber sensor uses a single mode optical fiber of the optical fiber composite ground wire as the sensor.
Preferably, the optical fiber composite ground wire is used as a sensor and is arranged along the whole power transmission line.
Preferably, the method further comprises the following steps:
an optical fiber access device; the optical fiber access device consists of an optical fiber junction box and a high-voltage insulator;
the optical fiber access device is used for connecting the sensing optical fiber with the distributed optical fiber acoustic sensing demodulator and realizing the insulation isolation between the distributed optical fiber acoustic sensing demodulator and the optical fiber composite ground wire.
Preferably, the sensing optical fiber of the optical fiber composite ground wire is electrically connected with the distributed optical fiber acoustic sensing demodulator through an optical fiber access device.
Preferably, the computer system is electrically connected with the distributed optical fiber acoustic sensing demodulator through a USB interface.
Preferably, the distributed optical fiber sensor is fixed on the optical fiber composite ground line at certain intervals.
Preferably, the method comprises the following steps:
s1, collecting dynamic tension distribution data of the optical fiber composite ground wire;
s2, calculating and generating a change value of each measured inching tension 60S;
s3, clustering and analyzing the correlation between the change value of the dynamic tension 60S and the icing state of the optical fiber composite ground wire;
and S4, establishing an optical fiber composite ground wire icing state regression mathematical model, and realizing monitoring of the optical fiber composite ground wire icing state.
Preferably, the ice coating state of the optical fiber composite ground wire is monitored by selecting 60s dynamic tension change values of m measuring points of the optical fiber composite ground wire as related influence factors of the ice coating state, performing regression analysis and deducing an ice coating state regression analysis model.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention has no power supply unit, the service life of the monitoring equipment is not limited by severe environment, and the stability of the equipment is high.
2. The invention uses the optical fiber inside the OPGW optical cable erected by the line as the sensing optical fiber.
3. The invention has no extra communication cost and high information security.
4. The invention takes light as a sensing medium, resists electromagnetic interference and has accurate data measurement.
5. The invention has long monitoring distance and is distributed monitoring.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic diagram of the system of the present invention;
FIG. 3 is a diagram of mathematical analysis data according to the present invention.
In the figure: 1-distributed optical fiber acoustic sensing demodulator; 2-optical fiber composite ground wire; 3-a distributed fiber optic sensor; 4-an optical fiber access device; 5-a computer system; 6-power transmission tower.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
referring to fig. 1-3, the present invention provides a technical solution: transmission line optical fiber composite ground wire icing state monitoring system includes: the distributed optical fiber acoustic sensing demodulator comprises a distributed optical fiber acoustic sensing demodulator 1, an optical fiber composite ground wire 2, a distributed optical fiber sensor 3, a computer system 5 and a power transmission tower 6.
Further, the distributed optical fiber acoustic sensing demodulator 1 is configured to emit light pulses and perform phase demodulation on the reflected rayleigh scattered light.
Further, the distributed optical fiber sensor 3 is used for monitoring the strain parameters of each measurement point of the optical fiber composite ground wire 2.
The distributed optical fiber acoustic sensing demodulator 1 is fixedly installed on one side of the top end of the power transmission tower 6, and the optical fiber composite ground wire 2 is fixedly installed on the top end of the power transmission tower 6.
Further, the computer system 5 is configured to receive the strain parameters of the measurement points of the distributed optical fiber sensor 3 sent by the distributed optical fiber acoustic sensing demodulator 1.
The distributed optical fiber sensor 3 uses a single mode optical fiber of the optical fiber composite ground wire 2 as a sensor.
The optical fiber composite ground wire 2 is used as a sensor and is arranged along the whole line of the power transmission line.
Wherein, still include: an optical fiber access device 4; the optical fiber access device 4 is composed of an optical fiber junction box and a high-voltage insulator.
Further, the optical fiber access device 4 is used for connecting the sensing optical fiber with the distributed optical fiber acoustic sensing demodulator 1 and realizing the insulation isolation between the distributed optical fiber acoustic sensing demodulator 1 and the optical fiber composite ground wire 2.
The sensing optical fiber of the optical fiber composite ground wire 2 is electrically connected with the distributed optical fiber acoustic sensing demodulator 1 through the optical fiber access device 4.
The computer system 5 is electrically connected with the distributed optical fiber acoustic sensing demodulator 1 through a USB interface.
The distributed optical fiber sensors 3 are fixed on the optical fiber composite ground wire 2 at certain intervals.
Example 2:
referring to fig. 1-3, the present invention provides a technical solution: the technical scheme for monitoring the icing state of the optical fiber composite ground wire of the power transmission line comprises the following steps of:
s1, collecting dynamic tension distribution data of the optical fiber composite ground wire;
s2, calculating and generating a change value of each measured inching tension 60S;
s3, clustering and analyzing the correlation between the change value of the dynamic tension 60S and the icing state of the optical fiber composite ground wire;
and S4, establishing an optical fiber composite ground wire icing state regression mathematical model, and realizing monitoring of the optical fiber composite ground wire icing state.
The method comprises the steps of selecting 60s dynamic tension change values of m measuring points of the optical fiber composite ground wire as related influence factors of the icing state, carrying out regression analysis, deducing an icing state regression analysis model, and monitoring the icing state of the optical fiber composite ground wire.
By integrating the above embodiments, the change of the dynamic tension of the optical fiber composite ground wire under the ice coating condition along with time is selected as the related factor of the ice coating state, and the monitoring method for predicting the ice coating state of the optical fiber composite ground wire through multivariate linear regression analysis solves the problem that the accuracy of the monitored ice coating state is not high due to the fact that the parameters such as weather, wire tension, wire wind deflection angle and the like are selected in the existing analysis method and the data normalization, stability and accuracy of the wire ice coating state are poor through statistical analysis, and the error caused by the measurement accuracy can be reduced, the stability of a mathematical model is improved, and the random error is reduced by selecting the change value of the 60s dynamic tension of each measurement point of the optical fiber composite ground wire as the related influence factor of the ice coating state.
In the several embodiments provided in the present invention, it should be understood that the disclosed apparatus may be implemented in other ways. The welding or screwing or winding of the parts to be welded or screwed together as shown or discussed can be assisted by means of devices such as welding torches, screwing with wrenches, etc., and the parts of the device can be made of various materials, such as metal materials, for example, aluminum alloys, steel and copper, by casting or by mechanical stamping.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. Transmission line optical fiber composite ground wire icing state monitoring system which characterized in that includes:
the distributed optical fiber acoustic sensing demodulator (1), the distributed optical fiber acoustic sensing demodulator (1) is used for emitting light pulse and demodulating the phase of the reflected Rayleigh scattering light;
an optical fiber composite ground wire (2);
the distributed optical fiber sensor (3) is used for monitoring the strain parameters of each measuring point of the optical fiber composite ground wire (2);
the computer system (5) is used for receiving the strain parameters of each measuring point of the distributed optical fiber sensor (3) sent by the distributed optical fiber acoustic sensing demodulator (1);
a power transmission tower (6);
the distributed optical fiber acoustic sensing demodulator (1) is fixedly installed on one side of the top end of the power transmission tower (6), and the optical fiber composite ground wire (2) is fixedly installed on the top end of the power transmission tower (6).
2. The system for monitoring the icing state of the optical fiber composite ground wire of the power transmission line according to claim 1, characterized in that: the distributed optical fiber sensor (3) uses a single mode optical fiber of the optical fiber composite ground wire (2) as a sensor.
3. The system for monitoring the icing state of the optical fiber composite ground wire of the power transmission line according to claim 1, characterized in that: the optical fiber composite ground wire (2) is used as a sensor and is arranged along the whole line of the power transmission line.
4. The system for monitoring the icing state of the optical fiber composite ground wire of the power transmission line according to claim 1, further comprising:
an optical fiber access device (4); the optical fiber access device (4) is composed of an optical fiber junction box and a high-voltage insulator;
the optical fiber access device (4) is used for connecting the sensing optical fiber with the distributed optical fiber acoustic sensing demodulator (1) and realizing the insulation isolation of the distributed optical fiber acoustic sensing demodulator (1) and the optical fiber composite ground wire (2).
5. The system for monitoring the icing state of the optical fiber composite ground wire of the power transmission line according to claim 1, characterized in that: and the sensing optical fiber of the optical fiber composite ground wire (2) is electrically connected with the distributed optical fiber acoustic sensing demodulator (1) through the optical fiber access device (4).
6. The system for monitoring the icing state of the optical fiber composite ground wire of the power transmission line according to claim 1, characterized in that: and the computer system (5) is electrically connected with the distributed optical fiber acoustic sensing demodulator (1) through a USB interface.
7. The system for monitoring the icing state of the optical fiber composite ground wire of the power transmission line according to claim 1, characterized in that: the distributed optical fiber sensors (3) are fixed on the optical fiber composite ground wire (2) at certain intervals.
8. The technical scheme for monitoring the icing state of the optical fiber composite ground wire of the power transmission line according to claim 1 is characterized by comprising the following steps of:
s1, collecting dynamic tension distribution data of the optical fiber composite ground wire;
s2, calculating and generating a change value of each measured inching tension 60S;
s3, clustering and analyzing the correlation between the change value of the dynamic tension 60S and the icing state of the optical fiber composite ground wire;
and S4, establishing an optical fiber composite ground wire icing state regression mathematical model, and realizing monitoring of the optical fiber composite ground wire icing state.
9. The technical scheme for monitoring the icing state of the optical fiber composite ground wire of the power transmission line according to claim 8 is characterized in that: the ice coating state of the optical fiber composite ground wire is monitored by selecting 60s dynamic tension change values of m measuring points of the optical fiber composite ground wire as related influence factors of the ice coating state, performing regression analysis and deducing an ice coating state regression analysis model.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010197438.9A CN111189485A (en) | 2020-03-19 | 2020-03-19 | System for monitoring icing state of optical fiber composite ground wire of power transmission line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010197438.9A CN111189485A (en) | 2020-03-19 | 2020-03-19 | System for monitoring icing state of optical fiber composite ground wire of power transmission line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111189485A true CN111189485A (en) | 2020-05-22 |
Family
ID=70706892
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010197438.9A Pending CN111189485A (en) | 2020-03-19 | 2020-03-19 | System for monitoring icing state of optical fiber composite ground wire of power transmission line |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111189485A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113359211A (en) * | 2021-06-15 | 2021-09-07 | 武汉英泰晟视智感科技有限公司 | Bird damage monitoring method for whole-line power transmission line |
-
2020
- 2020-03-19 CN CN202010197438.9A patent/CN111189485A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113359211A (en) * | 2021-06-15 | 2021-09-07 | 武汉英泰晟视智感科技有限公司 | Bird damage monitoring method for whole-line power transmission line |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11150083B2 (en) | Real-time overhead power line sag monitoring | |
| CN203310540U (en) | Temperature and strain on-line monitoring device integrating optical phase conductors | |
| CN101614602B (en) | Method and device for monitoring power transmission line | |
| CN110926523A (en) | High-speed railway bridge safety perception and early warning system under complicated abominable condition | |
| CN112202493A (en) | Fault detection method, device and system for communication line | |
| CN102103173A (en) | Method and system for monitoring current-carrying capacity of cable based on distributed optical fiber temperature measuring method | |
| CN103698001B (en) | A kind of transmission line galloping monitoring method analyzing method based on monocular vision | |
| CN204881661U (en) | Improve distributed optical fiber sensing system spatial resolution and positioning accuracy's optical fiber sensor | |
| CN2691021Y (en) | Optical fiber temperature detection defect early warning composite power cable | |
| CN115566804A (en) | Electric power monitoring system based on distributed optical fiber sensing technology | |
| CN104635079A (en) | Electric aerial optical cable carrying capacity monitoring method based on whole-course distribution way | |
| CN103616101A (en) | Method for detecting optical fiber composite ground wire icing state of electric transmission line | |
| CN201955411U (en) | Cable current carrying capacity monitoring system based on distributed optical fiber temperature measuring method | |
| CN111189485A (en) | System for monitoring icing state of optical fiber composite ground wire of power transmission line | |
| CN108871449A (en) | A kind of transmission line online monitoring system with electric field monitoring | |
| Pavlinic et al. | Direct monitoring methods of overhead line conductor temperature | |
| CN202511922U (en) | Oppc optical cable stress and carrying capacity measuring and calculating system | |
| CN213213470U (en) | Fault detection system for communication line | |
| CN212539208U (en) | System for monitoring icing state of optical fiber composite ground wire of power transmission line | |
| CN104121945A (en) | Distributed sag online monitoring system and method for optical fiber composite overhead ground wire | |
| CN109959847B (en) | Optical fiber passive pollution flashover monitoring system | |
| CN115615332A (en) | State on-line monitoring system of optical fiber composite overhead ground wire | |
| CN114659612A (en) | Rail transit train positioning system and method based on fiber bragg grating array | |
| CN112013908A (en) | Method for monitoring state of key stress point of overhead transmission line | |
| CN116388859B (en) | Optical fiber state monitoring data acquisition device, method, equipment and medium |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |