CN209745445U - Cable condition assessment system - Google Patents

Abstract

The present application relates to a cable status evaluation system, which includes an optical fiber pressure measuring device used to obtain the inner layer stress information of the cable; an information conversion device connected to the optical fiber pressure measuring device for signal conversion, and used to convert electrical signals into digital signals; The power supply device is electrically connected with the optical fiber pressure measuring device and the information conversion device, and is used to provide electric energy for the optical fiber pressure measurement device and the information conversion device; the data analysis and evaluation device is connected with the signal of the information conversion device , for analyzing and evaluating the digital signal. The cable condition assessment system provided in the present application can effectively assess the stress change condition of the cable under the running condition.

Description

Cable condition assessment system

technical field

The present application relates to the technical field of real-time monitoring of cable operating status, in particular to a cable status evaluation system.

Background technique

With the development of shore power technology, cables have been more and more widely used in shore power transmission. The cable is a special cable used in ships and ports. It needs to adapt to the special environment of the port. It should have the characteristics of moisture resistance, high temperature resistance, bending resistance, high flexibility, and excellent electrical properties. It also requires insulation and mechanical properties. Perform real-time assessments.

At present, the domestic monitoring of cable operating status is limited to ordinary cables, and the monitoring of cable operating status at home and abroad is still relatively weak, and it is impossible to monitor and evaluate the cable operating status in real time. Especially in the running state of the cable, the monitoring method of the traditional solution can only obtain the surface stress of the cable running state, but cannot evaluate the stress of the inner layer of the cable.

Therefore, the traditional scheme cannot effectively evaluate the stress change status of the cable under operating conditions.

Utility model content

Based on this, it is necessary to provide a cable state evaluation system for the traditional schemes that cannot effectively evaluate the stress changes in the cable operating state.

A cable condition assessment system for cables comprising:

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

An information conversion device is connected to the optical fiber pressure measuring device for converting electrical signals into digital signals;

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

The data analysis and evaluation device is connected with the information conversion device by signal, and is used for analyzing and evaluating the digital signal.

The cable state evaluation system provided in this 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 for collecting the inner layer stress information of the cable. The information converting device is connected with the optical fiber pressure measuring device for converting the stress information into a digital signal. The power supply device provides electric energy for the optical fiber pressure measurement device and the information conversion device. The data analysis and evaluation device is signal-connected with the information conversion device for analyzing and evaluating the digital signal. The cable state evaluation system provided in the present application can obtain the stress information of the inner layer of the cable by means of optical fiber pressure measurement. Furthermore, the optical fiber pressure measurement device transmits the stress information of the inner layer of the cable under the running 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 in the operating state.

In one of the embodiments, the optical fiber pressure measuring device includes:

laser transmitter;

an optical splitter, the optical input end of the optical splitter is electrically and signally connected to the laser transmitter;

The first coupler is electrically and signally connected to the optical output end of the optical splitter;

a heterodyne detector electrically and signally connected to the first coupler;

a photodetector electrically and signally connected to the heterodyne detector;

The first amplifier is electrically and signally connected with the photodetector and the information conversion device.

In one of the embodiments, the optical fiber pressure measuring device also includes:

A pulse modulator is electrically and signally connected to the optical splitter;

The second coupler is electrically and signally connected with the pulse modulator.

In one of the embodiments, the pulse modulator includes:

a light intensity modulator electrically and signally connected to the second coupler;

A phase modulator is electrically and signally connected with the light intensity modulator.

In one of the embodiments, the optical fiber pressure measuring device also includes:

An optical filter is electrically and signally connected to the phase modulator and the first coupler.

In one of the embodiments, the optical fiber pressure measuring device also includes:

a first driver, electrically and signally connected to the pulse modulator;

The second driver is electrically and signally connected to the light intensity modulator;

The third driver is electrically and signally connected to the phase modulator.

In one of the embodiments, it also includes:

A temperature acquisition device is electrically and signally connected with the information conversion device, and the temperature acquisition device is used to collect the operating temperature of the cable.

In one of the embodiments, the temperature acquisition device includes:

laser pulse emitter;

An optical coupler is electrically and signally connected to the laser pulse transmitter;

A splitting filter is electrically and signally connected to the optocoupler;

A photoelectric converter, electrically connected and signal connected with the optical splitting filter;

The second amplifier is electrically and signally connected to the photoelectric converter and the information conversion device at the same time.

In one of the embodiments, it is characterized in that it also includes:

A display device is connected to the data analysis and evaluation device in signal connection.

In one of the embodiments, it also includes:

A storage device is connected in signal with the data analysis and evaluation device.

In one of the embodiments, the storage device is a memory.

Description of drawings

Fig. 1 is a schematic diagram of the principles of a cable condition assessment system provided by an embodiment of the present application.

Fig. 2 is a schematic diagram of a temperature measuring device provided by an embodiment of the present application.

Explanation of reference signs:

Cable condition assessment system 10

Fiber Optic Pressure Measuring Device 100

laser emitter 110

beam 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 Filters 184

first drive 190

Second drive 191

Third Drive 192

Information conversion device 200

Power supply unit 300

data analysis evaluation device 400

Temperature acquisition device 500

Laser pulse emitter 510

Optocoupler 520

Spectral filter 530

Photoelectric Converter 540

Second amplifier 550

display device 700

storage device 800

Detailed ways

The traditional solution cannot effectively evaluate the stress change status of the cable in the running state. Based on this, the present application provides a cable state evaluation system.

In order to make the purpose, technical solution and advantages of the present application clearer, the cable status assessment system of the present application will be further described in detail through the following embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present application, not to limit the present application.

The serial numbers assigned to components in this document, such as "first", "second", etc., are only used to distinguish the described objects, and do not have any sequence or technical meaning. The "connection" and "connection" mentioned in this application all include direct and indirect connection (connection) unless otherwise specified. In the description of this application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", The orientation or positional relationship indicated by "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description , rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and thus should not be construed as limiting the application.

In the present application, unless otherwise clearly specified and limited, a first feature being "on" or "under" a second feature may mean that the first and second features are in direct contact, or that the first and second features are indirect through an intermediary. touch. Moreover, "above", "above" and "above" the first feature on the 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. "Below", "beneath" and "beneath" the first feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is less horizontally than the second feature.

Please refer to FIG. 1 , this embodiment provides a cable status evaluation system 10 for evaluating the running status of cables. The cable status evaluation system 10 includes an optical fiber pressure measuring device 100 , an information summoning device 200 , a power supply device 300 and a data analysis and evaluation device 400 .

The optical fiber pressure measuring device 100 is used to obtain the inner layer stress information of the cable. In one embodiment, the fiber optic 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 , a light intensity modulator 182 , a phase modulator 183 and an optical filter 184 . The optical fiber load measuring device 100 also includes a first driver 190 , a second driver 191 and a third driver 192 .

The laser emitter 110 is a laser diode emitting a beam of light. Further, the optical input end of the optical splitter 120 is electrically and signally connected with the laser pulse transmitter 110 . Therefore, the beam travels 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. Further, the first coupler 130 is electrically and signally connected to the optical output end of the optical splitter 120 , and the pulse modulator 180 is electrically connected and signally connected to the optical splitter 120 . Therefore, after the light beam is split into two, one beam of local oscillator light enters the first coupler 130, and the first coupler 130 can realize the combination of local oscillator light and scattered light. Another beam passes through the pulse modulator 180 and becomes modulated light and enters the second coupler 181 . The pulse modulator is used to modulate the light beam into pulsed light.

Further, the change of the inner layer stress of the cable leads to light scattering, 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 paths of light do not interfere with each other. Further, the optical modulator 182 is electrically and signally connected to the second coupler 181 . Moreover, the phase modulator 183 is electrically and signally connected to the light intensity modulator 182 . The light modulator 182 can adjust the intensity of reflected light to prevent distortion. Further, the optical filter 184 is electrically and signally connected to the phase modulator 183 and the first coupler 130 , and the optical filter 184 can filter out stray light and allow reflected pulsed light to pass. 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 local oscillator light and scattered light enter the heterodyne detector 140 . The heterodyne detector 140 can make a difference between local oscillator light and reflected light to obtain detection light. Further, the photodetector 150 is electrically and signally connected with the heterodyne detector 140, and the photodetector 150 can convert an optical signal into an electrical signal. Further, the first amplifier 160 is electrically and signally connected with 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 .

The first driver 190 is electrically and signally connected with the pulse modulator 180 for controlling the pulse width of the pulsed light. The second driver 191 is electrically and signally connected with the light intensity modulator 182 for controlling the intensity of the pulsed light. The third driver 192 is electrically and signally connected with the light intensity modulator 183 for controlling the phase of the pulsed light.

The information converting device 200 is connected to the optical fiber load measuring device 100 for converting electrical signals into digital signals. Specifically, the information conversion device 200 may be an analog-to-digital converter, or an analog-to-digital conversion circuit, or other devices that can convert electrical signals into digital signals, which can be selected according to actual needs, and are not limited in this application. The information converting device 200 is connected to the optical fiber load measuring device 100 for converting electrical signals into digital signals. Specifically, the information conversion device 200 is electrically and signally connected to the first amplifier 160 for receiving 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 for providing electrical 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, which may be selected according to actual needs, and are not limited in this application.

The data analysis and evaluation device 400 is signal-connected with the information conversion device 200 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 selected according to actual needs, which is not limited in this application. 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 inner layer of the cable exceeds the allowable stress, and judge whether the stress gradient modulus exceeds the limit value of the stress gradient, and if so, give an early warning. The data analysis and evaluation device 400 can also analyze the stress gradient, and give an early warning if the stress gradient is greater than a preset value.

The cable status evaluation system 10 provided in this embodiment includes the optical fiber pressure measurement device 100 , an information conversion device 200 , a power supply device 300 and a 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 converting device 200 is connected with the optical fiber load measuring device 100 for converting the stress information into a digital signal. The power supply device 300 provides electric energy for the optical fiber pressure measuring device 100 and the information conversion device 200 . The data analysis and evaluation device 400 is signal-connected with the information conversion device 200 for analyzing and evaluating the digital signal. The cable condition evaluation system 10 provided in the present application can obtain the stress information of the inner layer of the cable by means of optical fiber pressure measurement. Furthermore, the optical fiber load measuring device 100 transmits the stress information of the inner layer under the operating state of the cable to the data analysis and evaluation device 400 through the information conversion device 200 . Then, the staff can obtain analysis and evaluation results from the data analysis and evaluation device 400 in real time, and the analysis and evaluation results include stress changes in the cable inner layer. Therefore, the staff can effectively evaluate the stress change status of the cable in the operating state.

Please refer to FIG. 2 , in an embodiment of the present application, the cable state assessment system 10 further includes a temperature collection device 500 , and the temperature collection device 500 is used to collect the operating temperature of the cable. The temperature acquisition device 500 can be a temperature sensor installed on the surface of the cable, or an optical fiber temperature sensor installed on the inner layer of the cable, which can be selected according to actual needs, and is not limited in this application. The temperature acquisition device 500 is electrically and signally connected with 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, and the data analysis and evaluation device 400 performs analysis and processing. The data analysis and evaluation device 400 can give an early warning to the operating temperature of the cable, and if the operating temperature of the cable exceeds a preset temperature, an early warning will be issued. If the ampacity of the cable exceeds the preset ampacity, an early warning will be given.

In addition, the data analysis and evaluation device 400 can also analyze the cable overload limit time t ₁ , if t ₁ is greater than the preset time, an early warning will be issued, and if t ₁ is not greater than the preset time, the current carrying capacity of the cable will be recalculated . The data analysis and evaluation device 400 can also analyze the limit time t ₂ when the stress gradient of the cable is too large. If t ₂ is greater than the preset time, an early warning will be issued. If t ₂ is not greater than the preset time, the stress gradient is recalculated. If the data analysis and evaluation device 400 judges the running state of the cable and there is no warning, then the running state of the cable is judged to be excellent. If there is an early warning, it is judged that the cable is in good condition. If two early warnings occur at the same time, it is judged that the cable operation status is medium. If more than three early warnings occur at the same time, it is judged that the cable operation status is poor.

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 .

The laser pulse emitter 510 is electrically connected to the power supply device 300 . The laser pulse emitter 510 is used to emit light pulses. The optical coupler 520 is electrically and signally connected with the laser pulse transmitter 510, and the optical pulse emitted by the laser pulse transmitter 510 is transmitted through the optical coupler 520, and then propagates along the optical fiber. When the pulsed light propagates in the cable, every point 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 spectroscopic filter 530 is electrically and signally connected to the optical coupler 520, the reflected light is transmitted to the spectroscopic filter 530 through the optical coupler 520, and the wavelength is separated by the spectroscopic filter 530. Pick and filter. The photoelectric converter 540 is electrically and signally connected with the optical splitting filter 530, and the photoelectric converter 540 is used for converting an optical signal into an electrical signal. The second amplifier 550 is electrically and signally connected to the photoelectric converter 540 and the information conversion device 200 at the same time, and the second amplifier 550 is used for amplifying electrical signals. 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 .

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. And when the cable is in humid or hot weather, the weather has little influence on the data collection of the temperature collection device 500 and has little influence on the measurement accuracy of the temperature collection device 500 .

Please refer to FIG. 1 , in an embodiment of the present application, the cable status assessment system further includes a display device 700 . The display device 700 is signal-connected with the data analysis and evaluation device 400 for displaying the running state of the cable. The running state of the cable includes the stress of the inner layer of the cable in the running state and the temperature of the cable in running. In one embodiment, the display device 700 is a liquid crystal display. It can be understood that the display device 700 can also be other types of displays, which can be selected according to actual needs, and are not limited in this application. The display device 700 can help the staff to observe the running status of the cable more intuitively, and it is easier for the staff to grasp the running status of the cable.

In one embodiment of the present application, the cable status evaluation system 10 further includes a storage device 800 , which is connected to the data analysis and evaluation device 400 by a signal. In one embodiment, the storage device 800 is a memory. The storage device 800 may be an external memory, or a memory provided in the data analysis and evaluation device 400, which may be selected according to actual needs, and is not limited in this application. 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 organize the operation 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.

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

The above-mentioned embodiments only express several implementation modes of the present application, and the description thereof is relatively specific and detailed, but should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of protection of the patent application should be based on the appended claims.

Claims (11)

1. A cable state assessment system, for evaluating the operating state of cables, is characterized in that, comprising: An optical fiber pressure measuring device (100), used to obtain the inner layer stress information of the cable; An information conversion device (200), connected to the optical fiber pressure measuring device (100) for signal conversion, for converting electrical signals into digital signals; A power supply device (300), electrically connected to the optical fiber pressure measuring device (100) and the information conversion device (200); The data analysis and evaluation device (400) is signal-connected with the information conversion device (200), and is used for analyzing and evaluating the digital signal. 2. The cable condition assessment system according to claim 1, wherein said optical fiber pressure measuring device (100) comprises: laser transmitter (110); An optical splitter (120), the optical input end of the optical splitter (120) is electrically and signally connected to the laser transmitter (110); A first coupler (130), electrically connected and signal connected to the optical output end of the optical splitter (120); a heterodyne detector (140), electrically and signally connected to the first coupler (130); a photodetector (150), electrically and signally connected to the heterodyne detector (140); The first amplifier (160) is electrically and signally connected with the photodetector (150) and the information conversion device (200). 3. The cable condition assessment system according to claim 2, wherein said optical fiber pressure measuring device (100) further comprises: A pulse modulator (180), electrically and signally connected to the optical splitter (120); The second coupler (181) is electrically and signally connected to the pulse modulator (180). 4. The cable condition assessment system according to claim 3, wherein said pulse modulator (180) comprises: A light intensity modulator (182), electrically and signally connected to the second coupler (181); A phase modulator (183) is electrically and signally connected to the light intensity modulator (182). 5. The cable condition assessment system according to claim 4, wherein the optical fiber pressure measuring device (100) further comprises: An optical filter (184) is electrically and signally connected to the phase modulator (183) and the first coupler (130). 6. The cable condition assessment system according to claim 4, wherein the optical fiber pressure measuring device (100) further comprises: a first driver (190), electrically and signally connected to the pulse modulator (180); The second driver (191) is electrically and signally connected to the light intensity modulator (182); The third driver (192) is electrically and signally connected to the phase modulator (183). 7. The cable condition assessment system according to claim 1, further comprising: The temperature acquisition device (500) is electrically and signally connected with the information conversion device (200), and the temperature acquisition device (500) is used to collect the operating temperature of the cable. 8. The cable state assessment system according to claim 7, wherein said temperature acquisition device (500) comprises: Laser pulse emitter (510); An optical coupler (520), electrically and signally connected to the laser pulse transmitter (510); A splitting filter (530), electrically and signally connected to the optical coupler (520); A photoelectric converter (540), electrically connected and signal connected with the optical splitting filter (530); The second amplifier (550) is electrically and signally connected to the photoelectric converter (540) and the information conversion device (200). 9. The cable condition assessment system according to any one of claims 1 to 8, further comprising: The display device (700) is signal-connected with the data analysis and evaluation device (400). 10. The cable condition assessment system according to claim 9, further comprising: The storage device (800) is signal-connected with the data analysis and evaluation device (400). 11. The cable condition evaluation system according to claim 10, characterized in that, the storage device (800) is a memory.