CN110443968A - A kind of cable external force damage alarm diagnostic device based on vibration signal monitoring - Google Patents
A kind of cable external force damage alarm diagnostic device based on vibration signal monitoring Download PDFInfo
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- CN110443968A CN110443968A CN201910706514.1A CN201910706514A CN110443968A CN 110443968 A CN110443968 A CN 110443968A CN 201910706514 A CN201910706514 A CN 201910706514A CN 110443968 A CN110443968 A CN 110443968A
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- external force
- vibration signal
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 21
- 230000006378 damage Effects 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 8
- 230000005540 biological transmission Effects 0.000 claims abstract description 7
- 230000010355 oscillation Effects 0.000 claims abstract description 7
- 230000008569 process Effects 0.000 claims abstract description 6
- 230000009545 invasion Effects 0.000 claims abstract description 5
- 238000005070 sampling Methods 0.000 claims description 16
- 238000001228 spectrum Methods 0.000 claims description 16
- 238000012545 processing Methods 0.000 claims description 7
- 238000009434 installation Methods 0.000 claims description 4
- 230000035945 sensitivity Effects 0.000 claims description 4
- 230000002159 abnormal effect Effects 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 claims description 3
- 230000004044 response Effects 0.000 claims description 3
- 230000005856 abnormality Effects 0.000 claims description 2
- 239000013307 optical fiber Substances 0.000 description 6
- 201000004569 Blindness Diseases 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000001066 destructive effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000010358 mechanical oscillation Effects 0.000 description 1
- 238000010183 spectrum analysis Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H11/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties
- G01H11/06—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means
- G01H11/08—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means using piezoelectric devices
-
- 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
Abstract
The invention discloses a kind of cable external force damage alarm diagnostic devices based on vibration signal monitoring, including, the distributed wireless vibrating sensor and host computer receiver that different parts are installed at a certain distance on channel inner cable ontology.Wireless vibration sensor is used to acquire the external force invasion vibration signal being subject in cable operational process, and exports to host computer receiver；Host computer receiver is used to receive the vibration signal of the wireless vibration sensor transmissions, and carries out vibration-mode analysis, shows current warning grade and modes of warning.Present invention is generally directed to conduit line inner cables to be invaded the vibration signal generated as monitoring object by external force, monitor the Oscillation Amplitude of cable in real time, pattern analysis and early warning are carried out in host computer, have the characteristics that high strong real-time, early warning accuracy, strong antijamming capability and can determine fault category.
Description
Technical field
The present invention relates to a kind of cable external force damage alarm diagnostic devices based on vibration signal monitoring, belong to transmission system
Middle power cable on-line monitoring and fault diagonosing technical field.
Background technique
Instantly city reconstruction is more and more, since overhead line influences urban, meeting again when breaking down in city
It threatens to people, the vehicle etc. on ground, overhead line changes the work that routinizes that cable embedment underground has been distribution network construction into.
Compared to aerial condutor, power cable transmission of electricity have do not take up an area space of planes, same buried cable channel can accommodate multi circuit transmission lines,
Influenced conducive to city appearance neat appearance, by natural meteorological condition and ambient enviroment very little, to the person it is safer, power supply can
The advantage high by property, operation and maintenance cost is less.Although cable laying is in underground, occupied area is small, and cable is in use
When be subjected to external force destruction, the safe and reliable advantage of cable power supply is severely impacted.Be laid at present the cable of underground by
The reason of destruction the mainly artificial medium and heavy machinery of pilferage and blindness work progress excavation etc..
The measure means for protecting cables from external force destruction commonly used at present are optical fiber vibration measuring.Although the spirit of optical fiber vibration measuring
The case where sensitivity is high, but there are more wrong reports, and optical fiber vibration measuring is for the discrimination of damaging vibration and non-destructive vibration
It is not high enough.The laying work amount of optical fiber distributed type vibration measuring system is big, and the cost of the maintenance in later period is high.The limitation of above-mentioned factor
Optical fiber vibration measuring is caused to be difficult to do vibration detection application in large-scale power cable system.
Experimental study show power cable in normal course of operation the mode of oscillation of itself with by external force invade when
Mode of oscillation makes a big difference.During conventional operation, cable periodically shakes by a small margin since circulating current can generate
It is dynamic；And when being invaded by external force, acutely, the vibration signal of generation usually has biggish amplitude and certain spy for cable body vibration
Frequency is levied, therefore, carrying out real-time vibration signal monitoring to power cable not only can make early warning to its external force destructive malfunction, also
Corresponding fault category can be analyzed and determined according to the shape information of vibration signal.Currently, vibrating sensor development on the market
Maturation, it is higher for the capture sensitivity of mechanical oscillation, the real-time sampling of vibration signal may be implemented, compare optical fiber vibration measuring side
Method, service life is longer, and size sluggishness is high, small power consumption, is suitble to the large-scale distributed sensor-based system of production, is also convenient for
The on-line monitoring of Vibration Condition is carried out to power cable.
Summary of the invention
The present invention, by the actual conditions such as human factor and blindness breakage in installation early warning, is proposed for conduit line inner cable
Based on vibration signal monitoring cable external force damage alarm diagnostic device, realize to conduit line inner cable by external force invade and
The real-time early warning of destruction monitors.
In order to achieve the above objectives, the present invention is realized by following technical proposal:
A kind of cable external force damage alarm diagnostic device based on vibration signal monitoring, including wireless vibration sensor and host computer
Receiver；The wireless vibration sensor is mounted on different parts on channel inner cable ontology；The wireless vibration sensor is used
The external force being subject in acquisition cable operational process invades vibration signal, and exports to host computer receiver；
The host computer receiver is used to receive the vibration signal of the wireless vibration sensor transmissions, and carries out mode of oscillation point
Analysis, shows current warning grade and modes of warning.
Further, wireless vibration sensor is mounted at conduit line inner cable bracket and position between two stands, and
Equidistant deployment is kept to install.
Further, wireless vibration sensor includes:
Sensor module includes vibrating sensor and Signal Pretreatment and modulus sampling A/D chip；The vibrating sensor is for adopting
The external force invasion vibration signal being subject in collection cable operational process, and voltage signal is converted by internal piezoelectric ceramics；Institute
It states Signal Pretreatment and modulus sampling A/D chip is used to convert digital signal by certain sample rate for voltage signal；
Central processing module, including arm processor and memory；The arm processor is for controlling Signal Pretreatment and modulus
Sampling, interception and the denoising of sampling A/D chip；The memory is for saving the vibration signal of sampling；
Wireless transport module, for the vibration signal of sampling to be transmitted to host computer receiver；
Power management module, for being powered to sensor module, central processing module and wireless transport module and power consumption pipe
Reason.
Further, wireless vibration sensor is greater than 5kHz using response band, and operating temperature range is -20 ° ~ 120 °,
Voltage sensibility is greater than the vibrating sensor of 100mV/g.
Further, host computer receiver carries out vibration-mode analysis, comprising:
Host computer receiver obtains the digitlization vibration signal waveforms of wireless vibration sensor, reads the waveform peak in a period of time
Value A；
As A < threshold value of warning S, it is judged as cable normal operation, wireless vibration sensor is sent just to host computer receiver
Normal status information；
As A > threshold value of warning S, it is judged as that questionable signal, wireless vibration sensor send abnormality letter to host computer receiver
Breath, while sending the questionable signal waveform in corresponding time window；
Host computer receiver carries out frequency-domain analysis by fast fourier transform algorithm to questionable signal waveform, and time domain waveform is believed
Number it is converted into frequency spectrum；
Frequency spectrum and historical data base are compared；
If the characteristic feature peak match in frequency spectrum and historical data base, is judged as corresponding fault type and alarms；
If not alarming with the matched characteristic feature peak of the frequency spectrum as suspicious abnormal signal in historical data base.
Further, host computer receiver can synchronize the digitlization vibration signal wave for receiving multiple wireless vibration sensors
Shape.
Further, the frequency spectrum characteristic peak information of typical fault is stored in historical data base.
The beneficial effects obtained by the present invention are as follows are as follows:
Present invention is generally directed to conduit line inner cables to be invaded the vibration signal generated as monitoring object, real time monitoring by external force
The Oscillation Amplitude of cable carries out pattern analysis and early warning in host computer, has strong real-time, early warning accuracy height, anti-interference energy
The features such as power is strong and can determine fault category.
Detailed description of the invention
Fig. 1 is wireless vibration Fundamentals of Sensors in the present invention；
Fig. 2 is the structure principle chart of wireless vibration sensor in the present invention；
Fig. 3 is the pictorial diagram of wireless vibration sensor in the present invention；
Fig. 4 is deployed position of the wireless vibration sensor in conduit line in the present invention；
Fig. 5 is host computer receiver vibration-mode analysis early warning decision logic in the present invention；
Fig. 6 is that vibrational waveform and result of spectrum analysis are surveyed during the present invention is implemented, and Fig. 6 (a) is actual measurement vibrational waveform, and Fig. 6 (b) is
Frequency-domain waveform.
Specific embodiment
The invention will be further described below.Following embodiment is only used for clearly illustrating technical side of the invention
Case, and not intended to limit the protection scope of the present invention.
The present invention provides a kind of cable external force damage alarm diagnostic device based on vibration signal monitoring, is connect using non-electrical
It touches, the mechanical signal detection means of non electrical quantity, realizes the real-time early warning invaded by external force conduit line inner cable and destroyed
Monitoring.Specifically, different parts install distributed wireless vibrating sensor at a certain distance on channel inner cable ontology, wirelessly
Vibrating sensor monitors the Vibration Condition of current cable, time recording Oscillation Amplitude, the vibrational states information such as frequency spectrum in real time.
Wireless vibration covers disposed on sensor has wireless transport module, and wireless transport module is for uploading to vibrational state information
Host computer receiver；Host computer receiver is used to carry out mould to the wireless vibration sensor current data and historical data received
State analysis, and show current warning grade and modes of warning or alarm.
Referring to Fig. 1, using response band wide (being greater than 5kHz), operating temperature range big (- 20 ° ~ 120 °), electricity in the present invention
Press the vibration signal of the wireless vibration sensor acquisition cable of high sensitivity (be greater than 100mV/g), output and vibration signal at than
The voltage signal of example.
The mounting means of wireless vibration sensor are as follows: partially selected at conduit line inner cable bracket and between two stands
The equidistant deployment installation of suitable position, destruction position is easily received to cable and is monitored.By taking 110kV cable as an example, wireless vibration is passed
The specific deployed position of sensor as shown in figure 4,6 installation site of wireless vibration sensor be the intermediate position of two cable bearer 7, actually answer
More wireless vibration sensor mount administrations may be selected in including the positions such as at bracket.
Referring to figs. 2 and 3, wireless vibration sensor 6 of the invention is by sensor module 1, central processing module 2, wirelessly
4 four modular units of transmission module 3 and power management module are constituted.It also include shell 5 in Fig. 2.
Wherein, vibrating sensor and Signal Pretreatment and modulus sampling A/D chip, vibrating sensor are included in sensor module
For acquiring the external force being subject in cable operational process invasion vibration signal and being converted into voltage by its internal piezoelectric ceramics
Signal；Signal Pretreatment and modulus sampling A/D chip are used to convert digital signal by certain sample rate for voltage signal.
Central processing module includes arm processor and memory, and arm processor is used to control Signal Pretreatment and modulus is adopted
Sample chip realizes sampling, interception and the denoising of voltage signal by programming；Memory is for saving sampled data.
Wireless transport module is used to the strum sampled signal that arm processor obtains being transmitted to host computer receiver.
Power management module is used to be powered sensor module, central processing module and wireless transport module and power consumption
Management.
Host computer receiver can synchronize the real time data for receiving multiple wireless vibration sensors in the present invention, and have vibration
Dynamic model analysis and status early warning function, the decision logic of vibration-mode analysis referring to Fig. 5, specifically: host computer receiver
The digitlization vibration signal waveforms for obtaining current each wireless vibration sensor read one to each wireless vibration sensor
Waveform peak A in the section time is judged as normal operation as A < threshold value of warning S, and wireless vibration sensor is to host computer
Receiver sends normal state information；As A > threshold value of warning S, it is judged as questionable signal, wireless vibration sensor is to host computer
Receiver sends abnormal state information, while sending the questionable signal waveform in corresponding time window, and host computer receiver is to suspicious
Signal waveform carries out frequency-domain analysis by fast fourier transform algorithm, converts frequency spectrum for time domain waveform signal to get arriving
The amplitude of different frequency component compares frequency spectrum and historical data base, if characteristic feature peak match, is judged as corresponding event
Barrier type is simultaneously alarmed；If not believing with the matched characteristic feature peak of the frequency spectrum as suspicious exception in historical data base
Number alarm.Database information can be constantly updated, and recognition accuracy is reinforced.The frequency of typical fault is stored in historical data base
Spectrum signature peak information.
Referring to Fig. 6, vibration signal waveforms when cable bearer are cut for the cutting machine that wireless vibration sensor is surveyed
Fig. 6 (a) and the frequency-domain waveform Fig. 6 (b) obtained by transformation.The shape information that the wireless vibration sensor is adopted is complete, frequency
There is apparent characteristic peak in spectrum, historical data base is added in the criterion that can be used as such failure.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations
Also it should be regarded as protection scope of the present invention.
Claims (7)
1. a kind of cable external force damage alarm diagnostic device based on vibration signal monitoring, which is characterized in that including wireless vibration
Sensor and host computer receiver；The wireless vibration sensor is mounted on different parts on channel inner cable ontology；The nothing
Linearly coupled sensor is used to acquire the external force invasion vibration signal being subject in cable operational process, and exports to host computer and receive
Device；
The host computer receiver is used to receive the vibration signal of the wireless vibration sensor transmissions, and carries out mode of oscillation point
Analysis, shows current warning grade and modes of warning.
2. a kind of cable external force damage alarm diagnostic device based on vibration signal monitoring according to claim 1, special
Sign is that the wireless vibration sensor is mounted at conduit line inner cable bracket and position between two stands, and keep etc.
Distance deployment installation.
3. a kind of cable external force damage alarm diagnostic device based on vibration signal monitoring according to claim 1, special
Sign is that the wireless vibration sensor includes:
Sensor module includes vibrating sensor and Signal Pretreatment and modulus sampling A/D chip；The vibrating sensor is for adopting
The external force invasion vibration signal being subject in collection cable operational process, and voltage signal is converted by internal piezoelectric ceramics；Institute
It states Signal Pretreatment and modulus sampling A/D chip is used to convert digital signal by certain sample rate for voltage signal；
Central processing module, including arm processor and memory；The arm processor is for controlling Signal Pretreatment and modulus
Sampling, interception and the denoising of sampling A/D chip；The memory is for saving the vibration signal of sampling；
Wireless transport module, for the vibration signal of sampling to be transmitted to host computer receiver；
Power management module, for being powered to sensor module, central processing module and wireless transport module and power consumption pipe
Reason.
4. a kind of cable external force damage alarm diagnostic device based on vibration signal monitoring according to claim 3, special
Sign is that the wireless vibration sensor is greater than 5kHz using response band, and operating temperature range is -20 ° ~ 120 °, voltage spirit
Sensitivity is greater than the vibrating sensor of 100mV/g.
5. a kind of cable external force damage alarm diagnostic device based on vibration signal monitoring according to claim 1, special
Sign is that the host computer receiver carries out vibration-mode analysis, comprising:
Host computer receiver obtains the digitlization vibration signal waveforms of wireless vibration sensor, reads the waveform peak in a period of time
Value A；
As A < threshold value of warning S, it is judged as cable normal operation, wireless vibration sensor is sent just to host computer receiver
Normal status information；
As A > threshold value of warning S, it is judged as that questionable signal, wireless vibration sensor send abnormality letter to host computer receiver
Breath, while sending the questionable signal waveform in corresponding time window；
Host computer receiver carries out frequency-domain analysis by fast fourier transform algorithm to questionable signal waveform, and time domain waveform is believed
Number it is converted into frequency spectrum；
Frequency spectrum and historical data base are compared；
If the characteristic feature peak match in frequency spectrum and historical data base, is judged as corresponding fault type and alarms；
If not alarming with the matched characteristic feature peak of the frequency spectrum as suspicious abnormal signal in historical data base.
6. a kind of cable external force damage alarm diagnostic device based on vibration signal monitoring according to claim 5, special
Sign is that the host computer receiver can synchronize the digitlization vibration signal waveforms for receiving multiple wireless vibration sensors.
7. a kind of cable external force damage alarm diagnostic device based on vibration signal monitoring according to claim 5, special
Sign is, the frequency spectrum characteristic peak information of typical fault is stored in the historical data base.
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| CN201910706514.1A CN110443968A (en) | 2019-08-01 | 2019-08-01 | A kind of cable external force damage alarm diagnostic device based on vibration signal monitoring |
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| CN201910706514.1A CN110443968A (en) | 2019-08-01 | 2019-08-01 | A kind of cable external force damage alarm diagnostic device based on vibration signal monitoring |
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Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111189533A (en) * | 2019-12-26 | 2020-05-22 | 深圳供电局有限公司 | External force invasion monitoring method and device, computer equipment and storage medium |
| CN111308544A (en) * | 2020-02-19 | 2020-06-19 | 广东电网有限责任公司 | Prevent external damage response positioner based on sound is gathered |
| CN111397725A (en) * | 2020-03-20 | 2020-07-10 | 符霞 | Automatic monitoring system and method for intelligent vibration frequency spectrum sensor |
| CN111509844A (en) * | 2020-04-14 | 2020-08-07 | 佛山市威格特电气设备有限公司 | Cable external damage prevention early warning device with handheld electric pick characteristic quantity recognition function |
| CN111780855A (en) * | 2020-05-26 | 2020-10-16 | 山东大学 | Cable external-damage-prevention method and system based on fiber radial vibration source ranging vibration identification |
| CN111862506A (en) * | 2020-07-29 | 2020-10-30 | 杭州巨骐信息科技股份有限公司 | Holographic sensing external force damage monitoring method |
| CN111982192A (en) * | 2020-08-11 | 2020-11-24 | 国家电网有限公司技术学院分公司 | Cable fault self-learning identification method and system based on Internet of things |
| CN112082642A (en) * | 2020-09-14 | 2020-12-15 | 江苏华世远电力技术有限公司 | Modular cable trench system capable of automatically early warning |
| CN112285483A (en) * | 2020-10-15 | 2021-01-29 | 国网河北省电力有限公司邯郸供电分公司 | Storage medium, system and method for accurately positioning cable fault |
| CN112419634A (en) * | 2020-11-13 | 2021-02-26 | 广东电网有限责任公司 | External damage prevention system for power cable |
| CN112803341A (en) * | 2020-12-31 | 2021-05-14 | 国网浙江省电力有限公司嘉兴供电公司 | Non-invasive cable anti-breaking monitoring device and method |
| CN113140367A (en) * | 2021-04-25 | 2021-07-20 | 渝丰科技股份有限公司 | Trigger type early warning cable |
| CN113706843A (en) * | 2021-08-25 | 2021-11-26 | 国网湖南省电力有限公司 | Cable external force damage detection device and application method thereof |
| CN113936438A (en) * | 2021-10-12 | 2022-01-14 | 国家电网有限公司 | Underground cable operating environment monitoring and early warning device |
| CN113993001A (en) * | 2021-09-08 | 2022-01-28 | 四创电子股份有限公司 | Real-time streaming analysis alarm method based on sliding data window |
| CN114001939A (en) * | 2021-10-20 | 2022-02-01 | 广州番禺电缆集团有限公司 | Line connection device monitoring method, device, equipment and storage medium |
| CN114353935A (en) * | 2022-01-04 | 2022-04-15 | 北京英华达软件工程有限公司 | Electric quantity controllable wireless vibration acceleration sensor |
| CN114706062A (en) * | 2022-06-02 | 2022-07-05 | 武汉新能源研究院有限公司 | Protection system for monitoring cable external force damage |
| CN115060326A (en) * | 2022-07-12 | 2022-09-16 | 四川鑫电电缆有限公司 | Cable monitoring method and system |
| CN115684349A (en) * | 2022-10-28 | 2023-02-03 | 北京交通大学 | Pipeline wearing-through real-time early warning method based on vibration signals |
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|---|---|---|---|---|
| CN111189533A (en) * | 2019-12-26 | 2020-05-22 | 深圳供电局有限公司 | External force invasion monitoring method and device, computer equipment and storage medium |
| CN111308544A (en) * | 2020-02-19 | 2020-06-19 | 广东电网有限责任公司 | Prevent external damage response positioner based on sound is gathered |
| CN111397725A (en) * | 2020-03-20 | 2020-07-10 | 符霞 | Automatic monitoring system and method for intelligent vibration frequency spectrum sensor |
| CN111509844A (en) * | 2020-04-14 | 2020-08-07 | 佛山市威格特电气设备有限公司 | Cable external damage prevention early warning device with handheld electric pick characteristic quantity recognition function |
| CN111780855A (en) * | 2020-05-26 | 2020-10-16 | 山东大学 | Cable external-damage-prevention method and system based on fiber radial vibration source ranging vibration identification |
| CN111862506A (en) * | 2020-07-29 | 2020-10-30 | 杭州巨骐信息科技股份有限公司 | Holographic sensing external force damage monitoring method |
| CN111982192A (en) * | 2020-08-11 | 2020-11-24 | 国家电网有限公司技术学院分公司 | Cable fault self-learning identification method and system based on Internet of things |
| CN112082642A (en) * | 2020-09-14 | 2020-12-15 | 江苏华世远电力技术有限公司 | Modular cable trench system capable of automatically early warning |
| CN112285483A (en) * | 2020-10-15 | 2021-01-29 | 国网河北省电力有限公司邯郸供电分公司 | Storage medium, system and method for accurately positioning cable fault |
| CN112419634A (en) * | 2020-11-13 | 2021-02-26 | 广东电网有限责任公司 | External damage prevention system for power cable |
| CN112803341A (en) * | 2020-12-31 | 2021-05-14 | 国网浙江省电力有限公司嘉兴供电公司 | Non-invasive cable anti-breaking monitoring device and method |
| CN113140367A (en) * | 2021-04-25 | 2021-07-20 | 渝丰科技股份有限公司 | Trigger type early warning cable |
| CN113140367B (en) * | 2021-04-25 | 2023-02-03 | 渝丰科技股份有限公司 | Trigger type early warning cable |
| CN113706843A (en) * | 2021-08-25 | 2021-11-26 | 国网湖南省电力有限公司 | Cable external force damage detection device and application method thereof |
| CN113706843B (en) * | 2021-08-25 | 2022-11-01 | 国网湖南省电力有限公司 | Cable external force damage detection device and application method thereof |
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Application publication date: 20191112 |