CN209745445U - Cable state evaluation system - Google Patents
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- CN209745445U CN209745445U CN201920417574.7U CN201920417574U CN209745445U CN 209745445 U CN209745445 U CN 209745445U CN 201920417574 U CN201920417574 U CN 201920417574U CN 209745445 U CN209745445 U CN 209745445U
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- 238000011156 evaluation Methods 0.000 title claims abstract description 33
- 238000006243 chemical reaction Methods 0.000 claims abstract description 46
- 239000013307 optical fiber Substances 0.000 claims abstract description 41
- 238000007405 data analysis Methods 0.000 claims abstract description 35
- 238000011157 data evaluation Methods 0.000 claims abstract description 33
- 230000003287 optical effect Effects 0.000 claims description 54
- 230000003595 spectral effect Effects 0.000 claims description 5
- 238000012545 processing Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 6
- 238000004458 analytical method Methods 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 4
- 230000010355 oscillation Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 2
- 238000009530 blood pressure measurement Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
the application relates to a cable state evaluation system, which comprises an optical fiber pressure measuring device, a signal processing device and a signal processing device, wherein the optical fiber pressure measuring device is used for acquiring inner layer stress information of a cable; the information conversion device is in signal connection with the optical fiber pressure measuring device and is used for converting an electric signal into a digital signal; the power supply device is electrically connected with the optical fiber pressure measuring device and the information conversion device and is used for providing electric energy for the optical fiber pressure measuring device and the information conversion device; and the data analysis and evaluation device is in signal connection with the information conversion device and is used for analyzing and evaluating the digital signals. The cable state evaluation system provided by the application can effectively evaluate the stress change condition of the cable in the running state.
Description
Technical Field
The application relates to the technical field of real-time monitoring of a cable running state, in particular to a cable state evaluation system.
background
with the development of shore power technology, cables are more and more widely applied to shore power transmission. The cable is a special cable used in ships and ports, needs to adapt to special use environments of ports, has the characteristics of moisture resistance, high temperature resistance, bending resistance, high flexibility, excellent electrical property and the like, and is required to be evaluated in real time on the insulation performance and the mechanical performance.
At present, the domestic monitoring of the running state of the cable is only limited to the common cable, and the domestic and foreign monitoring of the running state of the cable is weak, so that the running state of the cable cannot be monitored and evaluated in real time. Particularly, in the cable running state, the monitoring method of the traditional scheme cannot only obtain the surface stress of the cable in the running state, but cannot evaluate the stress of the inner layer of the cable.
Therefore, the traditional scheme cannot effectively evaluate the stress change condition of the cable in the running state.
SUMMERY OF THE UTILITY MODEL
Therefore, a cable state evaluation system is needed to be provided for the situation that the traditional scheme cannot effectively evaluate the stress change condition under the cable running state.
A cable condition assessment system for a cable, comprising:
The optical fiber pressure measuring device is used for acquiring inner layer stress information of the cable;
The information conversion device is in signal connection with the optical fiber pressure measuring device and is used for converting an electric signal into a digital signal;
The power supply device is electrically connected with the optical fiber pressure measuring device and the information conversion device;
and the data analysis and evaluation device is in signal connection with the information conversion device and is used for analyzing and evaluating the digital signals.
The cable state evaluation system comprises an optical fiber pressure measuring device, an information conversion device, a power supply device and a data analysis and evaluation device. The optical fiber pressure measuring device is used for collecting inner layer stress information of the cable. The information conversion device is in signal connection with the optical fiber pressure measuring device and is used for converting the stress information into a digital signal. The power supply device provides electric energy for the optical fiber pressure measuring device and the information conversion device. The data analysis and evaluation device is in signal connection with the information conversion device and is used for analyzing and evaluating the digital signals. The cable state evaluation system provided by the application can acquire the stress information of the inner layer of the cable by using an optical fiber pressure measurement method. And then, the optical fiber pressure measuring device transmits the inner layer stress information of the cable in the running state to the data analysis and evaluation device through the information conversion device. Then, the staff can obtain the analysis and evaluation result from the data analysis and evaluation device in real time, and the analysis and evaluation result comprises the stress change condition of the inner layer of the cable. Therefore, the stress change condition of the cable in the running state can be effectively evaluated by workers.
In one embodiment, the optical fiber pressure measuring device includes:
A laser transmitter;
the optical input end of the optical splitter is electrically connected and in signal connection with the laser transmitter;
The first coupler is electrically connected with the optical output end of the optical splitter and is in signal connection with the optical output end of the optical splitter;
A heterodyne detector electrically connected and signal connected to the first coupler;
The photoelectric detector is electrically connected with the heterodyne detector and is in signal connection with the heterodyne detector;
and the first amplifier is electrically connected with the photoelectric detector and the information conversion device and is in signal connection with the photoelectric detector and the information conversion device.
in one embodiment, the optical fiber pressure measuring device further includes:
the pulse modulator is electrically connected with the optical splitter and is in signal connection with the optical splitter;
and the second coupler is electrically connected with the pulse modulator and is in signal connection with the pulse modulator.
in one embodiment, the pulse modulator comprises:
the light intensity modulator is electrically connected with the second coupler and is in signal connection with the second coupler;
And the phase modulator is electrically connected with the light intensity modulator and is in signal connection with the light intensity modulator.
in one embodiment, the optical fiber pressure measuring device further includes:
an optical filter electrically and signal connected to the phase modulator and the first coupler.
In one embodiment, the optical fiber pressure measuring device further includes:
a first driver electrically and signal-connected to the pulse modulator;
the second driver is electrically connected with the light intensity modulator and is in signal connection with the light intensity modulator;
And the third driver is electrically connected with the phase modulator and is in signal connection with the phase modulator.
In one embodiment, the method further comprises:
And the temperature acquisition device is electrically connected with the information conversion device and is in signal connection with the information conversion device, and the temperature acquisition device is used for acquiring the operating temperature of the cable.
In one embodiment, the temperature acquisition device includes:
A laser pulse emitter;
The optical coupler is electrically connected and in signal connection with the laser pulse transmitter;
The optical splitting filter is electrically connected with the optical coupler and is in signal connection with the optical coupler;
The photoelectric converter is electrically connected with the spectral filter and is in signal connection with the spectral filter;
and the second amplifier is simultaneously electrically connected with the photoelectric converter and the information conversion device and is in signal connection with the photoelectric converter and the information conversion device.
In one embodiment, the method further includes:
And the display device is in signal connection with the data analysis and evaluation device.
In one embodiment, the method further comprises:
and the storage device is in signal connection with the data analysis and evaluation device.
In one embodiment, the storage device is a memory.
Drawings
Fig. 1 is a schematic diagram of a cable status evaluation system according to an embodiment of the present application.
Fig. 2 is a schematic diagram of a temperature measurement device according to an embodiment of the present application.
description of reference numerals:
Cable condition evaluation system 10
optical fiber pressure measuring device 100
laser emitter 110
light splitter 120
first coupler 130
Heterodyne detector 140
photodetector 150
First amplifier 160
Signal processor 170
Pulse modulator 180
second coupler 181
Light intensity modulator 182
phase modulator 183
optical filter 184
First driver 190
Second driver 191
third driver 192
Information conversion apparatus 200
Power supply device 300
data analysis and evaluation device 400
temperature acquisition device 500
Laser pulse emitter 510
Optical coupler 520
spectral filter 530
Photoelectric converter 540
Second amplifier 550
Display device 700
memory device 800
Detailed Description
The stress change condition under the cable running state can not be effectively evaluated by the traditional scheme, and based on the stress change condition, the cable state evaluation system is provided.
In order to make the objects, technical solutions and advantages of the present application more apparent, the cable state evaluation system of the present application is further described in detail by the following embodiments, with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
the numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings). In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present application and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be considered as limiting the present application.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Referring to fig. 1, the present embodiment provides a cable status evaluation system 10 for evaluating the operating status of a cable. The cable state evaluation system 10 comprises an optical fiber pressure measuring device 100, an information transmission device 200, a power supply device 300 and a data analysis and evaluation device 400.
the optical fiber pressure measuring device 100 is used for acquiring inner layer stress information of the cable. In one embodiment, the fiber optic pressure measurement device 100 includes a laser transmitter 110, an optical splitter 120, a first coupler 130, a heterodyne detector 140, a photodetector 150, and a first amplifier 160. Further, the optical fiber pressure measuring device 100 further includes a pulse modulator 180, a second coupler 181, a light intensity modulator 182, a phase modulator 183, and an optical filter 184. The optical fiber load cell device 100 further includes a first driver 190, a second driver 191, and a third driver 192.
The laser emitter 110 is a laser diode and emits a beam of light. Further, the optical input of the optical splitter 120 is electrically and signal connected to the laser pulse transmitter 110. The beam thus travels along the cable, passes through the splitter 120, and is split into two by the splitter 120. In one embodiment, the optical splitter 120 is an 1/2 optical splitter. Further, the first coupler 130 is electrically and signal-connected to the optical output of the optical splitter 120, and the pulse modulator 180 is electrically and signal-connected to the optical splitter 120. Therefore, after the light beam is split into two beams, one of the two beams enters the first coupler 130 as local oscillation light, and the first coupler 130 can combine the local oscillation light and the scattered light. The other beam becomes modulated light by the pulse modulator 180 into the second coupler 181. The pulse modulator is used for modulating the light beam into pulse light.
Further, the change of the stress of the inner layer of the cable causes the scattering of light, and the scattered light enters the second coupler 181 again. The second coupler 180 is connected to the pulse modulator 180, and the second coupler 180 is used to provide an optical channel for the modulated light and the reflected light, so that the two lights do not interfere with each other. Further, the optical modulator 182 is electrically and signal-connected to the second coupler 181. The phase modulator 183 is electrically connected to the optical intensity modulator 182 and is connected to the optical intensity modulator 182 by a signal. The light modulator 182 may adjust the intensity of the reflected light to prevent distortion. Further, the optical filter 184 is electrically connected and signal-connected to the phase modulator 183 and the first coupler 130, and the optical filter 184 may filter out stray light and pass reflected pulsed light. The light modulated by the phase modulator 183 enters the first coupler 130 through the optical filter 184.
Further, the heterodyne detector 140 is electrically and signally connected to the first coupler 130, so that the local oscillation light and the scattered light enter the heterodyne detector 140. The heterodyne detector 140 may obtain detected light by subtracting the local oscillation light from the reflected light. Further, the photodetector 150 is electrically connected and signal-connected to the heterodyne detector 140, and the photodetector 150 may convert an optical signal into an electrical signal. Further, the first amplifier 160 is electrically and signal-connected to the photodetector 150 and the information conversion device 200. The first amplifier 160 may amplify the electrical signal transmitted by the photodetector 150, and then transmit the amplified electrical signal to the information conversion apparatus 200.
The first driver 190 is electrically connected and signal-connected to the pulse modulator 180, and is configured to control a pulse width of the pulsed light. The second driver 191 is electrically connected and signal-connected to the light intensity modulator 182 for controlling the intensity of the pulsed light. The third driver 192 is electrically connected and signal-connected to the light intensity modulator 183, and is configured to control the phase of the pulsed light.
the information conversion device 200 is in signal connection with the optical fiber pressure measuring device 100, and is configured to convert an electrical signal into a digital signal. Specifically, the information conversion apparatus 200 may be an analog-to-digital converter, an analog-to-digital conversion circuit, or another apparatus capable of converting an electrical signal into a digital signal, which may be selected according to actual needs, and the present application is not limited thereto. The information conversion device 200 is in signal connection with the optical fiber pressure measuring device 100, and is configured to convert an electrical signal into a digital signal. Specifically, the information conversion apparatus 200 is electrically connected and signal-connected to the first amplifier 160, and is configured to receive the electrical signal amplified by the first amplifier 160.
The power supply device 300 is electrically connected to the optical fiber pressure measuring device 100 and the information conversion device 200, and is configured to provide electric energy to the optical fiber pressure measuring device 100 and the information conversion device 200. The power supply device 300 may be a storage battery, a lithium battery, or other types of batteries, and may be specifically selected according to actual needs, which is not limited in this application.
The data analysis and evaluation device 400 is in signal connection with the information conversion device 200 and is used for analyzing and evaluating the digital signal. The data analysis and evaluation device 400 may be a central processing unit, or other processors capable of performing data analysis, which may be specifically selected according to actual needs, and the present application is not limited thereto. In one embodiment, the data analysis and evaluation device 400 may further include an early warning unit. The data analysis and evaluation device 400 can calculate the stress of the cable inner layer and the stress gradient mode. The data analysis and evaluation device 400 can analyze and judge whether the stress of the cable inner layer exceeds the allowable stress and whether the stress gradient mode exceeds the stress gradient limit value, and if so, perform early warning. The data analysis and evaluation device 400 can also analyze the stress gradient, and if the stress gradient is greater than a preset value, an early warning is given.
the cable state evaluation system 10 provided by this embodiment includes the optical fiber pressure measuring device 100, the information conversion device 200, the power supply device 300, and the data analysis and evaluation device 400. The optical fiber pressure measuring device 100 is used for collecting inner layer stress information of the cable. The information conversion device 200 is in signal connection with the optical fiber pressure measuring device 100, and is configured to convert the stress information into a digital signal. The power supply device 300 supplies power to the optical fiber pressure measuring device 100 and the information conversion device 200. The data analysis and evaluation device 400 is in signal connection with the information conversion device 200 and is used for analyzing and evaluating the digital signal. The cable state evaluation system 10 provided by the present application can obtain stress information of the cable inner layer by using a method of measuring pressure by using an optical fiber. Further, the optical fiber pressure measuring device 100 transmits the inner layer stress information of the cable in the operating state to the data analysis and evaluation device 400 through the information conversion device 200. Then, the worker can obtain the analysis and evaluation result including the stress variation condition of the inner layer of the cable from the data analysis and evaluation device 400 in real time. Therefore, the stress change condition of the cable in the running state can be effectively evaluated by workers.
referring to fig. 2, in an embodiment of the present application, the cable condition evaluation system 10 further includes a temperature acquisition device 500, where the temperature acquisition device 500 is configured to acquire an operating temperature of the cable. Temperature acquisition device 500 can be for setting up the temperature sensor on the cable surface, or set up the optic fibre temperature sensor at the cable inlayer, specifically can select according to actual need, and this application does not do the restriction. The temperature acquisition device 500 is electrically connected and signal-connected with the information conversion device 200, and the temperature acquisition device 500 converts the operating temperature of the cable into an electric signal and transmits the electric signal to the information conversion device 200. The information conversion device 200 converts the electrical signal into an analog signal, transmits the analog signal to the data analysis and evaluation device 400, and the data analysis and evaluation device 400 performs analysis processing. The data analysis and evaluation device 400 can perform early warning on the operating temperature of the cable, and if the operating temperature of the cable exceeds a preset temperature, the early warning is performed. And if the current-carrying capacity of the cable exceeds the preset current-carrying capacity, early warning is carried out.
In addition, the data analysis and evaluation device 400 can also analyze the overload limit time t1 of the cable, and if t1 is greater than the preset time, an early warning is given, and if t1 is not greater than the preset time, the current-carrying capacity of the cable is recalculated. The data analysis and evaluation device 400 can also analyze the limit time t2 when the stress gradient of the cable is too large. And if t2 is greater than the preset time, early warning is given. If t2 is not greater than the predetermined time, the stress gradient is recalculated. If the data analysis and evaluation device 400 determines that the cable running state is good, no early warning is given. And if an early warning occurs, judging that the running state of the cable is good. And if two early warnings appear simultaneously, judging that the running state of the cable is in the middle. And if more than three early warnings appear at the same time, judging that the running state of the cable is poor.
In one embodiment of the present application, the temperature acquisition device 500 includes a laser pulse emitter 510, an optical coupler 520, a beam splitting filter 530, an optical-to-electrical converter 530, and a second amplifier 550.
The laser pulse transmitter 510 is electrically connected to the power supply device 300. The laser pulse transmitter 510 is used to emit a pulse of light. The optical coupler 520 is electrically and signal-connected with the laser pulse emitter 510, and the optical pulse emitted by the laser pulse emitter 510 is transmitted through the optical coupler 520 and further propagates along the optical fiber. The reflected light is generated at each point when the pulsed light propagates through the cable, and if the temperature at a certain point in the cable inner layer is relatively high, the intensity of the reflected light at the point is relatively high. Further, the optical splitter 530 is electrically connected and signal-connected to the optical coupler 520, the reflected light is transmitted to the optical splitter 530 through the optical coupler 520, and the optical splitter 530 selects and filters wavelengths. The optical-to-electrical converter 540 is electrically connected and signal-connected to the optical splitter 530, and the optical-to-electrical converter 540 is configured to convert an optical signal into an electrical signal. The second amplifier 550 is electrically connected and signal-connected to both the photoelectric converter 540 and the information converting apparatus 200, and the second amplifier 550 is used for amplifying the electrical signal. The second amplifier 550 transmits the electrical signal to the information conversion apparatus 200, and the information conversion apparatus 200 converts the electrical signal into a digital signal, which is then analyzed and processed by the data analysis and evaluation apparatus 400.
the temperature acquisition device 500 can detect the operating temperature of the inner layer of the cable, so that the detection result is more accurate and precise. And when the cable is in moist or hot weather, the weather has little influence on the data acquisition of the temperature acquisition device 500, and has little influence on the accuracy of the measurement of the temperature acquisition device 500.
Referring to fig. 1, in an embodiment of the present application, the cable status evaluation system further includes a display device 700. The display device 700 is in signal connection with the data analysis and evaluation device 400 and is used for displaying the operating state of the cable. The operating state of the cable includes the internal layer stress of the cable in the operating state and the temperature of the cable in operation. In one embodiment, the display device 700 is a liquid crystal display. It is understood that the display device 700 may also be other kinds of displays, which may be selected according to actual needs, and the present application is not limited thereto. The display device 700 can help workers to observe the running state of the cable more visually, and the workers can master the running state of the cable more conveniently.
In one embodiment of the present application, the cable condition evaluation system 10 further comprises a storage device 800, and the storage device 800 is in signal connection with the data analysis and evaluation device 400. In one embodiment, the storage device 800 is a memory. The storage device 800 may be an external memory, or may also be a memory disposed in the data analysis and evaluation device 400, which may be specifically selected according to actual needs, and the present application is not limited thereto. The storage device 800 can store the operating temperature of the cable, the stress of the inner layer of the cable and the stress gradient mode. The staff can arrange the operation data of the cable according to the data on the storage device 800, so the storage device 800 can help the staff to perform better data analysis.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (11)
1. a cable condition evaluation system for evaluating an operational condition of a cable, comprising:
the optical fiber pressure measuring device (100) is used for acquiring inner layer stress information of the cable;
The information conversion device (200) is in signal connection with the optical fiber pressure measuring device (100) and is used for converting the electric signals into digital signals;
the power supply device (300) is electrically connected with the optical fiber pressure measuring device (100) and the information conversion device (200);
the data analysis and evaluation device (400) is in signal connection with the information conversion device (200) and is used for analyzing and evaluating the digital signals.
2. the cable condition evaluation system according to claim 1, wherein the optical fiber pressure measuring device (100) comprises:
a laser emitter (110);
The optical input end of the optical splitter (120) is electrically connected and in signal connection with the laser transmitter (110);
A first coupler (130) electrically and signal connected to an optical output of the optical splitter (120);
A heterodyne detector (140) electrically and signal connected to the first coupler (130);
a photodetector (150) electrically and signal connected to the heterodyne detector (140);
A first amplifier (160) electrically and signal-connected to the photodetector (150) and the information conversion device (200).
3. The cable condition evaluation system according to claim 2, wherein the optical fiber pressure measuring device (100) further comprises:
A pulse modulator (180) electrically and signal connected to the optical splitter (120);
and a second coupler (181) electrically and signal-connected to the pulse modulator (180).
4. The cable condition evaluation system of claim 3, wherein the pulse modulator (180) comprises:
An optical intensity modulator (182) electrically and signal connected to the second coupler (181);
and the phase modulator (183) is electrically connected with the optical intensity modulator (182) and is in signal connection with the optical intensity modulator.
5. the cable condition evaluation system according to claim 4, wherein the optical fiber pressure measuring device (100) further comprises:
And an optical filter (184) electrically and signal-connected to the phase modulator (183) and the first coupler (130).
6. The cable condition evaluation system according to claim 4, wherein the optical fiber pressure measuring device (100) further comprises:
a first driver (190) electrically and signal connected to the pulse modulator (180);
A second driver (191) electrically and signally connected to the light intensity modulator (182);
A third driver (192) electrically and signal-connected to the phase modulator (183).
7. The cable condition evaluation system of claim 1, further comprising:
and the temperature acquisition device (500) is electrically connected with the information conversion device (200) and is in signal connection with the information conversion device, and the temperature acquisition device (500) is used for acquiring the operating temperature of the cable.
8. The cable condition evaluation system of claim 7, wherein the temperature acquisition device (500) comprises:
A laser pulse emitter (510);
An optical coupler (520) electrically and signal connected to the laser pulse transmitter (510);
a spectral filter (530) electrically and signal-connected to the optical coupler (520);
An optical-to-electrical converter (540) electrically and signal-connected to the spectral filter (530);
A second amplifier (550) electrically connected and signal-connected to both the photoelectric converter (540) and the information conversion device (200).
9. the cable status evaluation system according to any one of claims 1 to 8, further comprising:
and the display device (700) is in signal connection with the data analysis and evaluation device (400).
10. The cable condition evaluation system of claim 9, further comprising:
A storage device (800) in signal connection with the data analysis and evaluation device (400).
11. The cable condition evaluation system of claim 10, wherein the storage device (800) is a memory.
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| CN201920417574.7U CN209745445U (en) | 2019-03-29 | 2019-03-29 | Cable state evaluation system |
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| CN201920417574.7U CN209745445U (en) | 2019-03-29 | 2019-03-29 | Cable state evaluation system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109855778A (en) * | 2019-03-29 | 2019-06-07 | 深圳供电局有限公司 | cable state evaluation system |
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| CN109855778A (en) * | 2019-03-29 | 2019-06-07 | 深圳供电局有限公司 | cable state evaluation system |
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