Cable Condition Assessment System

Abstract

The present application relates to a cable status assessment system, including an optical fiber pressure measuring device for obtaining the inner layer stress information of the cable; an information conversion device, signal-connected to the optical fiber pressure measuring device, for converting the electrical signal into a digital signal; a power supply device, electrically connected to the optical fiber pressure measuring device and the information conversion device, for providing electrical energy to the optical fiber pressure measuring device and the information conversion device; and a data analysis and evaluation device, signal-connected to the information conversion device, for analyzing and evaluating the digital signal. The cable status assessment system provided by the present application can effectively evaluate the stress change status of the cable under the operating state.

Description

Technical Field

[0001] The present application relates to the technical field of real-time monitoring of cable operation status, and in particular to a cable status evaluation system. Background Art

[0002] With the development of shore power technology, cables have been more and more widely used in shore power transmission. Cables are special cables used in ships and ports. They need to adapt to the special use environment of ports and should have characteristics such as moisture resistance, high temperature resistance, bending resistance, high flexibility, and excellent electrical properties. In addition, their insulation and mechanical properties must be evaluated in real time.

[0003] At present, the monitoring of cable operation status in China is limited to ordinary cables, and the monitoring of cable operation status at home and abroad is still relatively weak, and it is impossible to monitor and evaluate the cable operation status in real time. Especially when the cable is in operation, the monitoring method of the traditional scheme can only obtain the surface stress of the cable in operation, but cannot evaluate the stress of the inner layer of the cable.

[0004] Therefore, traditional solutions cannot effectively evaluate the stress changes of cables under operating conditions. Summary of the invention

[0005] Based on this, it is necessary to provide a cable status assessment system as traditional solutions cannot effectively assess the stress changes under cable operation conditions.

[0006] A cable condition assessment system, used for a cable, comprising:

[0007] Optical fiber pressure measuring device, used to obtain the inner layer stress information of the cable;

[0008] An information conversion device, connected to the optical fiber pressure measuring device for converting electrical signals into digital signals;

[0009] A power supply device, electrically connected to the optical fiber pressure measuring device and the information conversion device;

[0010] The data analysis and evaluation device is signal-connected to the information conversion device and is used to analyze and evaluate the digital signal.

[0011] The cable status assessment system provided in the present application includes 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 to collect the inner layer stress information of the cable. The information conversion device is connected to the optical fiber pressure measuring device by signal, and is used to convert the stress information into a digital signal. The power supply device provides electrical energy to the optical fiber pressure measuring device and the information conversion device. The data analysis and evaluation device is connected to the information conversion device by signal, and is used to analyze and evaluate the digital signal. The cable status assessment system provided in the present application can obtain the stress information of the inner layer of the cable by using the optical fiber pressure measuring method. Furthermore, the optical fiber pressure measuring device transmits the inner layer stress information of the cable under the operating state to the data analysis and evaluation device through the information conversion device. Then, the staff can obtain the analysis and evaluation results from the data analysis and evaluation device in real time, and the analysis and evaluation results include the stress change status of the inner layer of the cable. Therefore, the staff can effectively evaluate the stress change status of the cable under the operating state.

[0012] In one embodiment, the optical fiber pressure measuring device comprises:

[0013] Laser transmitter;

[0014] An optical splitter, wherein the optical input end of the optical splitter is electrically and signal-connected to the laser transmitter;

[0015] A first coupler, electrically and signal-connected to the optical output end of the optical splitter;

[0016] a heterodyne detector, electrically and signal-connected to the first coupler;

[0017] a photoelectric detector, electrically and signal-connected to the heterodyne detector;

[0018] The first amplifier is electrically and signal-connected to the photodetector and the information conversion device.

[0019] In one embodiment, the optical fiber pressure measuring device further comprises:

[0020] a pulse modulator, electrically and signal-connected to the optical splitter;

[0021] The second coupler is electrically and signal-connected to the pulse modulator.

[0022] In one embodiment, the pulse modulator comprises:

[0023] a light intensity modulator, electrically and signal-connected to the second coupler;

[0024] The phase modulator is electrically and signal-connected to the optical intensity modulator.

[0025] In one embodiment, the optical fiber pressure measuring device further comprises:

[0026] An optical filter is electrically and signal-connected to the phase modulator and the first coupler.

[0027] In one embodiment, the optical fiber pressure measuring device further comprises:

[0028] a first driver, electrically and signal-connected to the pulse modulator;

[0029] A second driver, electrically and signal-connected to the light intensity modulator;

[0030] The third driver is electrically and signal-connected to the phase modulator.

[0031] In one embodiment, it also includes:

[0032] A temperature acquisition device is electrically connected and signal-connected to the information conversion device, and the temperature acquisition device is used to acquire the operating temperature of the cable.

[0033] In one embodiment, the temperature acquisition device comprises:

[0034] Laser pulse transmitter;

[0035] an optical coupler, electrically and signal-connected to the laser pulse transmitter;

[0036] A spectroscopic filter, electrically and signal-connected to the optical coupler;

[0037] A photoelectric converter, electrically and signal-connected to the optical splitter filter;

[0038] The second amplifier is electrically and signal-connected to the photoelectric converter and the information conversion device.

[0039] In one embodiment, it is characterized in that it also includes:

[0040] The display device is signal-connected to the data analysis and evaluation device.

[0041] In one embodiment, it also includes:

[0042] The storage device is signal-connected to the data analysis and evaluation device.

[0043] In one embodiment, the storage device is a memory. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 A schematic diagram of the principle of a cable status assessment system provided for one embodiment of the present application.

[0045] Figure 2 A schematic diagram of a temperature measurement device provided in one embodiment of the present application.

[0046] Description of reference numerals:

[0047] Cable Condition Assessment System 10

[0048] Optical fiber pressure measuring device 100

[0049] Laser transmitter 110

[0050] Spectrum Splitter 120

[0051] First coupler 130

[0052] Heterodyne detector 140

[0053] Photodetector 150

[0054] First amplifier 160

[0055] Signal processor 170

[0056] Pulse modulator 180

[0057] Second coupler 181

[0058] Light intensity modulator 182

[0059] Phase modulator 183

[0060] Optical filter 184

[0061] First Drive 190

[0062] Second drive 191

[0063] Third Drive 192

[0064] Information conversion device 200

[0065] Power supply device 300

[0066] Data analysis and evaluation device 400

[0067] Temperature collection device 500

[0068] Laser pulse transmitter 510

[0069] Optocoupler 520

[0070] Spectral filter 530

[0071] Photoelectric converter 540

[0072] Second amplifier 550

[0073] Display device 700

[0074] Storage device 800 DETAILED DESCRIPTION

[0075] Traditional solutions cannot effectively evaluate the stress changes of cables under operating conditions. Based on this, the present application provides a cable status evaluation system.

[0076] In order to make the purpose, technical solution and advantages of the present application more clear, the cable status assessment system of the present application is further described in detail below through embodiments and in combination with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present application and are not used to limit the present application.

[0077] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings). In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0078] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0079] See also Figure 1 The present embodiment provides a cable status evaluation system 10 for evaluating the operation status of a cable. The cable status evaluation system 10 includes an optical fiber pressure measuring device 100, an information conversion device 200, a power supply device 300 and a data analysis and evaluation device 400.

[0080] The optical fiber pressure measuring device 100 is used to obtain the inner layer stress information of the cable. In one embodiment, the optical fiber pressure measuring device 100 includes a laser transmitter 110, a beam 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 also includes a pulse modulator 180, a second coupler 181, an optical intensity modulator 182, a phase modulator 183 and an optical filter 184. The optical fiber pressure measuring device 100 also includes a first driver 190, a second driver 191 and a third driver 192.

[0081] The laser transmitter 110 is a laser diode that emits a beam of light. Furthermore, the optical input end of the beam splitter 120 is electrically connected and signal-connected to the laser pulse transmitter 110. Therefore, the light beam propagates forward along the optical cable, passes through the beam splitter 120, and is split into two by the beam splitter 120. In one embodiment, the beam splitter 120 is a 1 / 2 beam splitter. Furthermore, the first coupler 130 is electrically connected and signal-connected to the optical output end of the beam splitter 120, and the pulse modulator 180 is electrically connected and signal-connected to the beam splitter 120. Therefore, after the light beam is split into two, one of the beams is the local oscillation light that enters the first coupler 130, and the first coupler 130 can realize the combination of the local oscillation light and the scattered light. The other beam is converted into modulated light through the pulse modulator 180 and enters the second coupler 181. The pulse modulator is used to modulate the light beam into pulse light.

[0082] Furthermore, the change of stress in the inner layer of the cable causes scattering of light, and the scattered light then enters the second coupler 181. 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 paths of light do not interfere with each other. Further, the optical modulator 182 is electrically and signal-connected to the second coupler 181. And, the phase modulator 183 is electrically and signal-connected to the light intensity modulator 182. The optical modulator 182 can adjust the intensity of the reflected light to prevent distortion. Further, the optical filter 184 is electrically and signal-connected to the phase modulator 183 and the first coupler 130, and the optical filter 184 can filter out stray light and allow the reflected pulse light to pass. The light modulated by the phase modulator 183 enters the first coupler 130 through the optical filter 184.

[0083] Further, the heterodyne detector 140 is electrically connected and signal-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 can make a difference between the local oscillation light and the reflected light to obtain the detection light. Further, the photodetector 150 is electrically connected and signal-connected to the heterodyne detector 140, and the photodetector 150 can convert the optical signal into an electrical signal. Further, the first amplifier 160 is electrically connected and signal-connected to the photodetector 150 and the information conversion device 200. The first amplifier 160 can amplify the electrical signal transmitted by the photodetector 150, and then transmit it to the information conversion device 200.

[0084] The first driver 190 is electrically connected and signal-connected to the pulse modulator 180 to control the pulse width of the pulse light. The second driver 191 is electrically connected and signal-connected to the light intensity modulator 182 to control the intensity of the pulse light. The third driver 192 is electrically connected and signal-connected to the light intensity modulator 183 to control the phase of the pulse light.

[0085] The information conversion device 200 is signal-connected to the optical fiber pressure measuring device 100, and is used to convert the electrical signal into a digital signal. Specifically, the information conversion device 200 can be an analog-to-digital converter, or an analog-to-digital conversion circuit, or other devices that can convert electrical signals into digital signals. The specific selection can be based on actual needs, and this application does not limit it. The information conversion device 200 is signal-connected to the optical fiber pressure measuring device 100, and is used to convert the electrical signal into a digital signal. Specifically, the information conversion device 200 is electrically and signal-connected to the first amplifier 160, and is used to receive the electrical signal amplified by the first amplifier 160.

[0086] The power supply device 300 is electrically connected to the optical fiber pressure measuring device 100 and the information conversion device 200, and is used to provide power to the optical fiber pressure measuring device 100 and the information conversion device 200. The power supply device 300 can be a storage battery, a lithium battery or other types of batteries, which can be selected according to actual needs and is not limited in this application.

[0087] The data analysis and evaluation device 400 is connected to the information conversion device 200 by signal, and is used to analyze and evaluate the digital signal. The data analysis and evaluation device 400 can be a central processing unit, or other processors that can perform data analysis, which can be selected according to actual needs, and this application does not limit it. In one embodiment, the data analysis and evaluation device 400 can also include an early warning unit. The data analysis and evaluation device 400 can calculate the stress of the inner layer of the cable, and the stress gradient modulus. The data analysis and evaluation device 400 can analyze and determine whether the stress of the inner layer of the cable exceeds the allowable stress, and determine whether the stress gradient modulus exceeds the stress gradient limit. If it exceeds, an early warning is issued. 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 issued.

[0088] The cable state assessment system 10 provided in 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 to collect the inner layer stress information of the cable. The information conversion device 200 is connected to the optical fiber pressure measuring device 100 by signal, and is used to convert the stress information into a digital signal. The power supply device 300 provides electrical energy to the optical fiber pressure measuring device 100 and the information conversion device 200. The data analysis and evaluation device 400 is connected to the information conversion device 200 by signal, and is used to analyze and evaluate the digital signal. The cable state assessment system 10 provided in this application can obtain the stress information of the inner layer of the cable by using the optical fiber pressure measurement method. Furthermore, the optical fiber pressure measuring device 100 transmits the inner layer stress information of the cable under the operating state to the data analysis and evaluation device 400 through the information conversion device 200. Then, the staff can obtain the analysis and evaluation results from the data analysis and evaluation device 400 in real time, and the analysis and evaluation results include the stress change status of the inner layer of the cable. Therefore, the staff can effectively evaluate the stress changes of the cable under operating conditions.

[0089] See also Figure 2In one embodiment of the present application, the cable status assessment system 10 further includes a temperature acquisition device 500, and the temperature acquisition device 500 is used to collect the operating temperature of the cable. The temperature acquisition device 500 can be a temperature sensor arranged on the surface of the cable, or an optical fiber temperature sensor arranged on the inner layer of the cable. The specific selection can be made according to actual needs, and the present application does not limit it. The temperature acquisition device 500 is electrically connected and signal-connected to the information conversion device 200, and the temperature acquisition device 500 converts the operating temperature of the cable into an electrical signal and transmits it to the information conversion device 200. The information conversion device 200 converts the electrical signal into an analog signal and transmits it to the data analysis and evaluation device 400, which is analyzed and processed by the data analysis and evaluation device 400. The data analysis and evaluation device 400 can warn the operating temperature of the cable. If the operating temperature of the cable exceeds the preset temperature, a warning is issued. If the current carrying capacity of the cable exceeds the preset current carrying capacity, a warning is issued.

[0090] In addition, the data analysis and evaluation device 400 can also analyze the cable overload limit time t 1 , if t 1 If t is greater than the preset time, an alarm is issued. 1 If the time 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 t of excessive stress gradient of the cable 2 If t 2 If t is greater than the preset time, an alarm is issued. 2 If the time is not greater than the preset time, the stress gradient is recalculated. If there is no warning after the data analysis and evaluation device 400 judges the cable operation status, the cable operation status is judged to be excellent. If one warning appears, the cable operation status is judged to be good. If two warnings appear at the same time, the cable operation status is judged to be medium. If more than three warnings appear at the same time, the cable operation status is judged to be poor.

[0091] In one embodiment of the present application, the temperature acquisition device 500 includes a laser pulse transmitter 510 , an optical coupler 520 , a spectroscopic filter 530 , a photoelectric converter 530 , and a second amplifier 550 .

[0092] The laser pulse transmitter 510 is electrically connected to the power supply device 300. The laser pulse transmitter 510 is used to emit light pulses. The optical coupler 520 is electrically connected and signal-connected to the laser pulse transmitter 510. The light pulses emitted by the laser pulse transmitter 510 are transmitted through the optical coupler 520 and then propagate along the optical fiber. Each point of the pulse light propagating in the cable will generate reflected light. If the temperature of a certain point in the inner layer of the cable is relatively high, the intensity of the reflected light at this point will be greater. Further, the optical splitter filter 530 is electrically connected and signal-connected to the optical coupler 520. The reflected light is transmitted to the optical splitter filter 530 through the optical coupler 520, and the wavelength is selected and filtered by the optical splitter filter 530. The photoelectric converter 540 is electrically connected and signal-connected to the photoelectric converter 540. The photoelectric converter 540 is used to convert the optical signal into an electrical signal. The second amplifier 550 is electrically connected and signal-connected to the photoelectric converter 540 and the information conversion device 200 at the same time. The second amplifier 550 is used to amplify the electrical signal. The second amplifier 550 transmits the electrical signal to the information conversion device 200 , and the information conversion device 200 converts the electrical signal into a digital signal, which is then analyzed and processed by the data analysis and evaluation device 400 .

[0093] The temperature acquisition device 500 can detect the operating temperature of the inner layer of the cable, so the detection result is more accurate and precise. When the cable is in humid or hot weather, the weather has little effect on the data collection of the temperature acquisition device 500 and the accuracy of the measurement of the temperature acquisition device 500.

[0094] See also Figure 1 In one embodiment of the present application, the cable status assessment system further includes a display device 700. The display device 700 is signal-connected to the data analysis and assessment device 400, and is used to display the operating status of the cable. The operating status of the cable includes the inner layer stress of the cable when it is in operation, and the temperature of the cable when it is in operation. In one embodiment, the display device 700 is a liquid crystal display. It is understandable that the display device 700 can also be other types of displays, which can be selected according to actual needs, and this application does not limit it. The display device 700 can help the staff to observe the operating status of the cable more intuitively, and it is more convenient for the staff to grasp the operating status of the cable.

[0095] In one embodiment of the present application, the cable status assessment system 10 further includes a storage device 800, and the storage device 800 is signal-connected to the data analysis and assessment device 400. In one embodiment, the storage device 800 is a memory. The storage device 800 can be an external memory or a memory provided in the data analysis and assessment device 400. The storage device 800 can be selected according to actual needs, and the present application does not limit it. 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 model. The staff can sort out the operating data of the cable through the data on the storage device 800, so the storage device 800 can help the staff to perform better data analysis.

[0096] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0097] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A cable status evaluation system for evaluating the operating status of a cable, characterized in that: include: An optical fiber pressure measuring device (100) for obtaining inner layer stress information of a cable; An information conversion device (200) is signal-connected to the optical fiber pressure measuring device (100) and is used to convert the electrical signal into a digital signal; A power supply device (300) electrically connected to the optical fiber pressure measuring device (100) and the information conversion device (200); A temperature acquisition device (500) is used to acquire the operating temperature of the inner layer of the cable, and convert the operating temperature of the cable into an electrical signal for transmission to the information conversion device (200); the temperature acquisition device (500) comprises a laser pulse transmitter (510), an optical coupler (520), a spectroscopic filter (530), a photoelectric converter (540) and a second amplifier (550), wherein: the laser pulse transmitter (510) is electrically connected to the power supply device (300), the optical coupler (520) is electrically connected and signal-connected to the laser pulse transmitter (510), the spectroscopic filter (530) is electrically connected and signal-connected to the optical coupler (520), the photoelectric converter (540) is electrically connected and signal-connected to the spectroscopic filter (530), and the second amplifier (550) is electrically connected and signal-connected to the photoelectric converter (540) and the information conversion device (200) at the same time; The data analysis and evaluation device (400) is connected to the information conversion device (200) by signal, and is used to analyze and evaluate the digital signal, and is also used to calculate the stress of the inner layer of the cable and the stress gradient modulus, and to judge whether the stress of the inner layer of the cable exceeds the allowable stress, and to judge whether the stress gradient modulus exceeds the stress gradient limit value, and if so, to issue an early warning; the data analysis and evaluation device (400) is also used to issue an early warning for the operating temperature of the cable, and to issue an early warning if the operating temperature of the cable exceeds a preset temperature, and to issue an early warning if the current carrying capacity of the cable exceeds a preset current carrying capacity; Wherein, the optical fiber pressure measuring device (100) comprises: Laser transmitter (110); an optical splitter (120), the optical input end of the optical splitter (120) being electrically and signal-connected to the laser emitter (110), and being used to split the light beam emitted by the laser emitter (110) into two; A pulse modulator (180), electrically and signal-connected to the optical splitter (120), and used for modulating a beam of light received from the optical splitter (120) into pulsed light; A second coupler (181) is electrically and signal-connected to the pulse modulator (180), and is used to receive the pulse light and also to receive scattered light generated by changes in stress in the inner layer of the cable; A light intensity modulator (182) electrically and signal-connected to the second coupler (181); A phase modulator (183) electrically and signal-connected to the light intensity modulator (182); An optical filter (184) electrically and signal-connected to the phase modulator (183) and the first coupler (130); A first driver (190) is electrically and signal-connected to the pulse modulator (180) and is used to control the pulse width of the pulse light; A second driver (191) is electrically and signal-connected to the light intensity modulator (182) and is used to control the light intensity of the pulsed light; A third driver (192), electrically and signal-connected to the phase modulator (183), and used to control the phase of the pulsed light; A first coupler (130) is electrically and signal-connected to the optical output end of the optical splitter (120) to receive another beam of light split by the optical splitter (120) as local oscillation light; the first coupler (130) is used to realize the combination of the local oscillation light and the scattered light; 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); The first amplifier (160) is electrically and signal-connected to the photodetector (150) and the information conversion device (200).

2. The cable status assessment system according to claim 1, characterized in that: The laser emitter (110) is a laser diode.

3. The cable status assessment system according to claim 1, characterized in that: The optical splitter (120) is a 1 / 2 optical splitter.

4. The cable status assessment system according to claim 1, characterized in that: The information conversion device (200) is an analog-to-digital converter.

5. The cable status assessment system according to any one of claims 1 to 4, characterized in that: Also includes: The display device (700) is signal-connected to the data analysis and evaluation device (400).

6. The cable status assessment system according to claim 5, characterized in that: The display device (700) is a liquid crystal display screen.

7. The cable status assessment system according to claim 5, characterized in that: The display device (700) is used to display the operating status of the cable, wherein the operating status of the cable includes the inner layer stress of the cable during operation and the temperature of the cable during operation.

8. The cable status assessment system according to claim 5, characterized in that: Also includes: The storage device (800) is signal-connected to the data analysis and evaluation device (400).

9. The cable status assessment system according to claim 8, characterized in that: The storage device (800) is a memory.

10. The cable status assessment system according to claim 1, characterized in that: The power supply device (300) is a storage battery or a lithium battery.

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