Calibration connection assembly for transmission cable condition detection

Abstract

This invention provides a calibration connection assembly for power transmission cable condition detection. One end of the cable under test is fixed by a cable fixing platform, and the other end is connected to a tensile testing machine. A constant temperature control console is used to control the local temperature of the cable under test, and a vibrator is used to vibrate the cable under test. Each fiber Bragg grating sensor string includes a temperature sensor, a strain sensor, and a vibration sensor for acquiring various signals. The fiber Bragg grating sensor string is connected to a demodulator via a sensor connecting optical cable. The fiber Bragg grating demodulator demodulates the signals to obtain the calibration standard for the cable under test. Implementing this embodiment, each fiber Bragg grating sensor string includes a temperature sensor, a strain sensor, and a vibration sensor, enabling the measurement of strain, temperature, and vibration signals without the need for multiple sets of different types of instruments. It is applicable to different types of smart cables, the measurement process is convenient, measurement efficiency is improved, and it has versatility.

Description

Technical Field

[0001] This invention relates to the field of smart cables, and more particularly to a calibration connection component for power transmission cable status detection. Background Technology

[0002] Currently, smart cables are mainly made by embedding weak grating arrays into optical fibers. Existing methods for calibrating cables primarily include placing a simulated optical cable naturally and using a hot air gun to instantly raise its temperature; or coiling a section of the cable and placing it in a high-low temperature chamber to measure its temperature. When vibration parameters of the optical cable need to be measured, a vibration experiment is conducted using single-point excitation, and vibration signals are measured using a distributed vibration monitoring instrument. It is evident that existing technologies require the use of multiple sets of different types of instruments, making measurements cumbersome, labor-intensive, and inefficient. Summary of the Invention

[0003] This invention provides a calibration connection component for power transmission cable condition detection to solve the technical problem of low measurement efficiency in existing technologies.

[0004] To address the aforementioned technical problems, this invention provides a calibration connection assembly for power transmission cable status detection. The calibration connection assembly includes the cable under test, a tensile testing machine, a sensor connection optical cable, a fiber optic demodulator, a cable fixing platform, a constant temperature control platform, a vibrator, and several fiber optic sensor strings. One end of the cable to be tested is fixed by the cable fixing platform, and the other end of the cable to be tested is connected to the tensile testing machine, which straightens the cable to be tested. The tensile testing machine is also used to apply tensile force to the cable under test and to produce deformation; the constant temperature control console is used to control the local temperature of the cable under test, and the vibrator is used to make the cable under test vibrate; Each of the fiber Bragg grating sensor strings includes a temperature sensor, a strain sensor, and a vibration sensor, which are used to measure temperature signals, strain signals, and vibration signals in real time, respectively. The fiber Bragg grating sensor string is connected to the fiber Bragg grating demodulator via the sensor connecting optical cable; the fiber Bragg grating demodulator is used to demodulate the temperature signal, strain signal and vibration signal, thereby obtaining the calibration standard for the cable under test.

[0005] As a preferred embodiment, the calibration connection assembly further includes several sensor fixing components, each of the fiber Bragg grating sensor strings being mounted on the cable under test via the sensor fixing component; the sensor fixing component is arched, with the concave surface of the arch facing the cable under test; every two sensor fixing components are fixed to the cable under test by a pair of bolts.

[0006] As a preferred embodiment, the temperature sensor and the strain sensor are encapsulated in a dual-core optical cable using glass fiber. The concave surface of the arch is provided with a groove, and the opposite surface of the concave surface is provided with a flattening groove. The flattened groove is used to fix the vibration sensor, and the recess is used to fix the dual-core optical cable.

[0007] As a preferred embodiment, the dual-core optical cable includes a strain sensor string encapsulated by the glass fiber and a temperature sensor string encapsulated by capillary steel tubes, each capillary steel tube encapsulating a micro-bent fiber grating; the dual-core optical cable is tightly attached to the cable under test by multiple sensor fixing components.

[0008] As a preferred embodiment, the spacing between adjacent sensor fixtures is 0.2 meters to 3 meters.

[0009] As a preferred embodiment, the spacing between adjacent sensor fixtures is 0.5 meters.

[0010] As a preferred embodiment, each of the sensor fixtures has at least one strain sensor, vibration sensor, and temperature sensor fixed to it.

[0011] As a preferred embodiment, the vibration sensor is fixed to the flattened groove by welding.

[0012] Compared with the prior art, the embodiments of the present invention have the following beneficial effects: This invention provides a calibration connection assembly for power transmission cable condition detection. The assembly includes a cable under test, a tensile testing machine, a sensor connection optical cable, a fiber Bragg grating demodulator, a cable fixing platform, a constant temperature control platform, a vibrator, and several fiber Bragg grating sensor strings. One end of the cable under test is fixed by the cable fixing platform, and the other end is connected to the tensile testing machine, which straightens the cable. The tensile testing machine also applies tensile force to the cable under test and induces deformation. The constant temperature control platform controls the local temperature of the cable under test, and the vibrator causes the cable to vibrate. Each fiber Bragg grating sensor string includes a temperature sensor, a strain sensor, and a vibration sensor, used to measure temperature, strain, and vibration signals in real time, respectively. The fiber Bragg grating sensor strings are connected to the fiber Bragg grating demodulator via the sensor connection optical cable. The fiber Bragg grating demodulator demodulates the temperature, strain, and vibration signals to obtain a calibration standard for the cable under test. Implementing the embodiments of this application, each fiber Bragg grating sensor string includes a temperature sensor, a strain sensor, and a vibration sensor, which can realize the measurement of strain, temperature, and vibration signals without the need to use multiple sets of different types of instruments in combination. It is also applicable to different types of smart cables, the measurement process is convenient, the measurement efficiency is improved, and it has versatility. Attached Figure Description

[0013] Figure 1 : A flowchart illustrating an embodiment of the calibration connection component for power transmission cable status detection provided by the present invention.

[0014] Figure 2 : A flowchart illustrating one embodiment of the sensor fixture provided by the present invention.

[0015] Figure 3 : A flowchart illustrating another embodiment of the sensor fixture provided by the present invention.

[0016] Figure 4 : A schematic diagram of one embodiment of the vibration sensor string provided by the present invention.

[0017] Figure 5 : This is a schematic diagram of the internal structure of an embodiment of the dual-core optical cable provided by the present invention.

[0018] Figure 6 : A cross-sectional schematic diagram of an embodiment of the dual-core optical cable provided by the present invention.

[0019] In the diagram: Cable under test - 111; Fiber Bragg grating sensor string - 112; Sensor fixture - 113; Sensor connection optical cable - 114; Fiber Bragg grating demodulator - 115; Cable mounting platform - 116; Temperature control console - 117; Vibrator - 118; Tensile testing machine - 119; Flattened groove - 210; Groove - 211; Vibration sensor (string) - 212; Dual-core optical cable - 213; Temperature sensor (string) - 214; Micro-bend fiber Bragg grating - 215; Glass fiber layer - 216; Capillary steel tube - 217; Fiber Bragg grating string - 218; Dual-core optical cable cross-section - 219. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Example 1 Please refer to Figure 1 , Figure 1 A calibration connection assembly for power transmission cable status detection provided in an embodiment of the present invention includes a cable under test 111, a tensile testing machine 119, a sensor connection optical cable 114, a fiber Bragg grating demodulator 115, a cable fixing platform 116, a constant temperature control platform 117, a vibrator 118, and a plurality of fiber Bragg grating sensor strings 112. The cable under test 111 is a smart cable. One end of the cable under test 111 is fixed by the cable fixing platform 116, and the other end of the cable under test 111 is connected to the tensile testing machine 119 (controllable tensile testing machine). The cable under test 111 is straightened by the tensile testing machine 119. In this embodiment, both ends of the cable under test 111 can be wound onto the cable reel 110 respectively. This embodiment can measure only a section of the cable under test 111.

[0022] The tensile testing machine 119 is also used to apply tensile force to the cable under test 111 and generate deformation; the constant temperature control console 117 is used to control the local temperature of the cable under test 111, and the vibrator 118 is used to make the cable under test 111 vibrate. Each of the fiber Bragg grating sensor strings includes a temperature sensor 214, a strain sensor, and a vibration sensor 212. All of the above sensors are fiber Bragg grating sensors, which are used to measure temperature signals, strain signals, and vibration signals in real time, respectively. The fiber Bragg grating sensor string is connected to the fiber Bragg grating demodulator 115 via the sensor connecting optical cable 114; the fiber Bragg grating demodulator 115 is used to demodulate the temperature signal, strain signal and vibration signal, thereby obtaining the calibration standard for the cable under test 111.

[0023] Furthermore, the calibration connection assembly also includes several sensor fixing members 113, each of the fiber Bragg grating sensor strings 112 being mounted on the cable under test 111 via the sensor fixing member 113. (Refer to...) Figure 2 and Figure 3 The sensor fixing member 113 is arched, and the concave surface of the arch faces the cable under test 111; every two sensor fixing members 113 are fixed to the cable under test 111 by a pair of bolts, and the cable under test 111 is clamped in the center.

[0024] Preferably, the temperature sensor 214 and the strain sensor are encapsulated in a dual-core optical cable 213 through a glass fiber reinforced polymer (GFRP) layer 216; The concave surface of the arch is provided with a groove 211, and the opposite surface of the concave surface is provided with a flattening groove 210; The flattened groove 210 is used to fix the vibration sensor 212. The vibration sensor 212 and the flattened groove 210 can be connected by welding, glue, or double-sided tape. The groove 211 is used to fix the dual-core optical cable 213. The vibration sensor 212 can be encapsulated by a cantilever beam, and multiple vibration sensors 212 form multiple fiber Bragg grating string structures.

[0025] Please refer to Figures 4 to 6 The dual-core optical cable 213 includes a strain sensor string (one core) encapsulated by the glass fiber 216 and a temperature sensor string 214 (the other core) encapsulated by capillary tubes 217, each capillary tube 217 encapsulating a micro-bent fiber grating 215; the dual-core optical cable 213 is tightly attached to the cable under test 111 by multiple sensor fixing pieces 113. Regarding the dual-core optical cable 213, Figure 6 The cross-sectional view is shown as 219, the cross-section of the fiber optic cable with fiber optic grating string. The fiber optic grating string 218 is located at the very center. The two cores measure different parameters. The micro-bent fiber optic grating string in the capillary steel tube 217 has the function of measuring ambient temperature and compensating for the influence of temperature on the strain measurement of the other core.

[0026] The spacing between adjacent sensor fixtures 113 is 0.2 meters to 3 meters. More preferably, the spacing between adjacent sensor fixtures 113 is 0.5 meters. Thus, as an example of this embodiment, the total measurement distance is 2.5 meters. Using two fixtures 113 required for the fiber optic strain sensor as a group, and installing one group at 0.5-meter intervals, a total of 10 sensor fixtures 113 are required. If each sensor fixture 113 fixes at least one strain sensor, vibration sensor 212, and temperature sensor 214, then at least 5 fiber optic temperature sensors, 5 strain sensors, and 5 vibration sensors need to be installed in series. In this case, the spatial resolution for effectively measuring each parameter is less than 0.5 meters.

[0027] In this embodiment, temperature, strain, and vibration measurement values ​​are demodulated using a high-sensitivity demodulator 115. A controllable tensile testing machine 119 applies tension to the cable under test 111. This tension has a linear relationship with the strain grating string in the dual-core optical cable 213. Therefore, the tension of the cable under test 111 can be calculated from the wavelength change of the fiber optic strain sensor (when the temperature is constant, the fiber optic strain changes linearly with the wavelength). Simultaneously, when the temperature of the cable under test 111 is changed using a constant temperature control console 117, the real-time temperature can be calculated using the temperature of the dual-core optical cable 213. Vibration is provided by an exciter 118, and the actual vibration signal information is obtained through a vibration sensor 212. Thus, the calibration standard of the cable under test 111 is calculated using the obtained temperature signal, strain signal, and vibration signal. Implementing this embodiment, compared to the prior art, utilizes the advantages of fiber optic sensing, employs a series structure of fiber optic grating sensors, simplifies the connection between sensors, and simultaneously measures multiple parameters through a multi-channel parallel structure, thereby forming an intelligent cable calibration standard. This simplifies the operation of smart cables and enables assembly line production. At the same time, it provides an effective means of verifying the quality of smart cable manufacturing and whether the performance requirements meet the needs of power grid engineering applications.

[0028] Compared with the prior art, the embodiments of the present invention have the following beneficial effects: This invention provides a calibration connection assembly for power transmission cable condition detection. The assembly includes a cable under test, a tensile testing machine, a sensor connection optical cable, a fiber Bragg grating demodulator, a cable fixing platform, a constant temperature control platform, a vibrator, and several fiber Bragg grating sensor strings. One end of the cable under test is fixed by the cable fixing platform, and the other end is connected to the tensile testing machine, which straightens the cable. The tensile testing machine also applies tensile force to the cable under test and induces deformation. The constant temperature control platform controls the local temperature of the cable under test, and the vibrator causes the cable to vibrate. Each fiber Bragg grating sensor string includes a temperature sensor, a strain sensor, and a vibration sensor, used to measure temperature, strain, and vibration signals in real time, respectively. The fiber Bragg grating sensor strings are connected to the fiber Bragg grating demodulator via the sensor connection optical cable. The fiber Bragg grating demodulator demodulates the temperature, strain, and vibration signals to obtain a calibration standard for the cable under test. Implementing the embodiments of this application, each fiber Bragg grating sensor string includes a temperature sensor, a strain sensor, and a vibration sensor, which can realize the measurement of strain, temperature, and vibration signals without the need to use multiple sets of different types of instruments in combination. It is also applicable to different types of smart cables, the measurement process is convenient, the measurement efficiency is improved, and it has versatility.

[0029] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. In particular, it should be noted that any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention for those skilled in the art.

Claims

1. A calibration connection assembly for power transmission cable condition detection, characterized in that, The calibration connection assembly includes the cable under test, a tensile testing machine, a sensor connection optical cable, a fiber optic demodulator, a cable fixing platform, a constant temperature control platform, a vibrator, and several fiber optic sensor strings. One end of the cable to be tested is fixed by the cable fixing platform, and the other end of the cable to be tested is connected to the tensile testing machine, which straightens the cable to be tested. The tensile testing machine is also used to apply tensile force to the cable under test and to produce deformation; the constant temperature control console is used to control the local temperature of the cable under test, and the vibrator is used to make the cable under test vibrate; Each of the fiber Bragg grating sensor strings includes a temperature sensor, a strain sensor, and a vibration sensor, which are used to measure temperature signals, strain signals, and vibration signals in real time, respectively. The fiber Bragg grating sensor string is connected to the fiber Bragg grating demodulator via the sensor connecting optical cable; the fiber Bragg grating demodulator is used to demodulate the temperature signal, strain signal and vibration signal, thereby obtaining the calibration standard for the cable under test; The calibration connection assembly further includes several sensor fixing components, each of the fiber Bragg grating sensor strings is mounted on the cable under test through the sensor fixing component; the sensor fixing component is arched, and the concave surface of the arch faces the cable under test; every two of the sensor fixing components are fixed to the cable under test by a pair of bolts. The temperature sensor and the strain sensor are encapsulated in a dual-core optical cable using glass fiber. The concave surface of the arch is provided with a groove, and the opposite surface of the concave surface is provided with a flattening groove. The flattened groove is used to fix the vibration sensor, and the recess is used to fix the dual-core optical cable.

2. The calibration connection assembly for power transmission cable condition detection as described in claim 1, characterized in that, The dual-core optical cable includes a strain sensor string encapsulated by the glass fiber and a temperature sensor string encapsulated by capillary steel tubes, each capillary steel tube encapsulating a micro-bent fiber grating; the dual-core optical cable is tightly attached to the cable under test by multiple sensor fixing components.

3. The calibration connection assembly for power transmission cable condition detection as described in claim 2, characterized in that, The spacing between adjacent sensor fixtures is 0.2 meters to 3 meters.

4. The calibration connection assembly for power transmission cable condition detection as described in claim 3, characterized in that, The spacing between adjacent sensor fixtures is 0.5 meters.

5. The calibration connection assembly for power transmission cable status detection as described in claim 1, characterized in that, Each of the aforementioned sensor fixtures fixes at least one strain sensor, vibration sensor, and temperature sensor.

6. The calibration connection assembly for power transmission cable condition detection as described in claim 1, characterized in that, The vibration sensor is fixed to the flattened groove by welding.

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