Optical fiber sensor device embedded in smart grid power cable

Abstract

The utility model discloses a smart grid power cable embedded optical fiber sensor device which comprises a foot support and a base installed at the top end of the foot support, a lower pipe support is fixed at the top end of the base, and an upper pipe support used for being in bolted connection with the lower pipe support is arranged on the upper surface of the lower pipe support. The lower pipe support and the upper pipe support define a threading cavity for embedding a power cable, and the bottom of the lower pipe support and the top of the upper pipe support are each provided with two symmetrical cable hovering and centering structures used for supporting the power cable. According to the utility model, temperature monitoring of different positions of the outer wall of the cable is realized, and local temperature difference caused by single-point temperature measurement is eliminated, so that the temperature distribution condition of the outer wall of the cable is comprehensively known, and local temperature abnormity is timely found, thereby effectively preventing the problems of overload, short circuit and the like of the cable.

Description

Technical Field

[0001] The utility model relates to the technical field of cable equipment, in particular to an optical fiber sensor device embedded in a smart grid power cable. Background Art

[0002] The fiber optic temperature sensor is composed of optical fiber, optical fiber sensor, light source and spectrometer. The fiber optic temperature sensor uses the thermo-optic effect of optical fiber material and the fiber Bragg grating effect of fiber grating to monitor temperature changes. When the temperature-sensitive optical fiber is affected by temperature changes, its optical properties will change, causing the wavelength of the reflected light signal to change. The spectrometer will monitor these changes in real time and convert them into temperature data. In this way, the fiber optic temperature sensor device can realize real-time monitoring of the temperature in the power grid, power and cable system, helping operators to promptly detect potential overloads, short circuits and other faults.

[0003] For example, a fiber optic sensor device embedded in a super grid power cable disclosed in the authorization announcement number CN208860369U includes a conductive core; a protective mechanism, the protective mechanism is fixedly connected to the conductive core; a transmission optical fiber, the transmission optical fiber is fixedly connected to the protective mechanism; an installation mechanism, the installation mechanism includes two shells, a protrusion and a spring, one end of the spring is fixedly connected to the protective mechanism, the other end of the spring is fixedly connected to the shell, the shell is fixedly connected to the protrusion, the protrusion is snap-connected to the other shell, and the optical fiber sensing head is installed on the shell included in the installation mechanism through the installation mechanism installed on the protective mechanism outside the conductive core, so as to facilitate the installation and replacement of the optical fiber sensing head and the use of the optical fiber sensing device. However, in this technical solution, the optical fiber temperature sensor is mainly installed at a point outside the cable. Since the cross-section of the cable is a ring structure, the optical fiber temperature sensor can only monitor local temperature changes around the installation point, but cannot obtain the global temperature distribution, that is, ignore some local temperature anomalies, thereby affecting the evaluation of the overall safety status of the cable. Utility Model Content

[0004] The purpose of the utility model is to provide an optical fiber sensor device embedded in a smart grid power cable, by respectively installing two symmetrical optical fiber temperature sensors on the outer walls of a boltable upper pipe support and a lower pipe support, thereby forming four optical fiber temperature sensors distributed in an array, which measure the temperature of the outer wall of the power cable to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an optical fiber sensor device embedded in a smart grid power cable, comprising a foot support and a base installed on the top of the foot support, and a lower tube support is fixed to the top of the base, and an upper tube support is provided on the upper surface of the lower tube support for bolting to the lower tube support, and the lower tube support and the upper tube support form a threading cavity for embedding the power cable, and the bottom of the lower tube support and the top of the upper tube support are both provided with two symmetrical cable suspension centering structures for supporting the power cable, and the outer walls of both sides of the lower tube support and the upper tube support are both installed with convex columns, and the internal threads of the convex columns are installed with optical fiber temperature sensors.

[0006] Preferably, wings are fixed on both side outer walls of the lower tube support and the upper tube support, and positioning holes for bolts to enter are arranged on both sides of the inside of the wings.

[0007] Preferably, an internally threaded tube is fixed inside the protruding column, and through holes which are concentric with the internally threaded tube are provided on both inner walls of the lower tube support and the upper tube support.

[0008] Preferably, the outer surface of the optical fiber temperature sensor is provided with an external thread groove, and the external thread groove and the internal thread pipe thread cooperate.

[0009] Preferably, a locking nut is installed on one end of the surface of the external thread groove, and a locking gasket is mounted on the surface of the optical fiber temperature sensor on one side of the locking nut.

[0010] Preferably, the lower pipe support and the upper pipe support are both made of PVC material.

[0011] Preferably, the cable suspension and centering structure includes a U-shaped seat installed on the inner wall of one side of the lower tube support and the upper tube support, and a short shaft rotatably installed inside the U-shaped seat, a support arm is fixed to one end of the surface of the short shaft, a notch is provided on the end of the support arm close to the short shaft, and a torsion spring is installed on the surface of the short shaft.

[0012] Compared with the prior art, the beneficial effects of the utility model are as follows: the optical fiber sensor device embedded in the smart grid power cable is provided with structures that cooperate with each other, such as a lower tube support and a convex column, and multiple cable suspension centering structures make the power cable stably located on the central axis of the lower tube support and the upper tube support. Two optical fiber temperature sensors are respectively installed at symmetrical positions of the lower tube support and the upper tube support, so as to realize temperature monitoring of different positions of the outer wall of the cable, eliminate local temperature differences caused by single-point temperature measurement, thereby comprehensively understanding the temperature distribution of the outer wall of the cable, and timely discovering local temperature anomalies, thereby effectively preventing the occurrence of problems such as cable overload and short circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The three-dimensional structure of the utility model is shown in FIG. Figure 1 ;

[0014] Figure 2 The three-dimensional structure of the utility model is shown in FIG. Figure 2 ;

[0015] Figure 3 This is a schematic diagram of the main structure of the utility model;

[0016] Figure 4 It is a side cross-sectional structural schematic diagram of the utility model;

[0017] Figure 5 It is a three-dimensional structural schematic diagram of the cable suspension centering structure of the utility model;

[0018] In the figure: 1. foot support; 2. base; 3. lower tube support; 4. upper tube support; 5. wing edge; 501. positioning hole; 6. boss; 601. internal threaded tube; 7. optical fiber temperature sensor; 701. external threaded groove; 702. anti-loosening nut; 703. anti-loosening gasket; 8. through hole; 9. threading cavity; 10. cable suspension centering structure; 1001. U-shaped seat; 1002. short shaft; 1003. support arm; 1004. notch; 1005. torsion spring. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] See also Figure 1-5 The utility model provides an embodiment: an optical fiber sensor device embedded in a smart grid power cable, comprising a foot support 1 and a base 2 installed on the top of the foot support 1, and a lower pipe support 3 is fixed on the top of the base 2, and an upper pipe support 4 for bolting with the lower pipe support 3 is arranged on the upper surface of the lower pipe support 3, and wing edges 5 are fixed on the outer walls of both sides of the lower pipe support 3 and the upper pipe support 4, and positioning holes 501 for bolts to enter are arranged on both sides of the wing edges 5;

[0021] The lower pipe support 3 and the upper pipe support 4 form a threading cavity 9 for embedding the power cable. The bottom of the lower pipe support 3 and the top of the upper pipe support 4 are both provided with two symmetrical cable suspension centering structures 10 for supporting the power cable. The outer walls of both sides of the lower pipe support 3 and the upper pipe support 4 are both installed with convex columns 6. The inner threads of the convex columns 6 are installed with optical fiber temperature sensors 7. Two optical fiber temperature sensors 7 are respectively installed at symmetrical positions of the lower pipe support 3 and the upper pipe support 4, which can realize temperature monitoring of different positions of the outer wall of the cable and eliminate local temperature differences caused by single-point temperature measurement.

[0022] An internal threaded tube 601 is fixed inside the boss 6, and through holes 8 that are concentric with the internal threaded tube 601 are provided on both inner walls of the lower tube support 3 and the upper tube support 4. An external threaded groove 701 is provided on the outer surface of the optical fiber temperature sensor 7, and the external threaded groove 701 and the internal threaded tube 601 are threadedly matched. When the optical fiber temperature sensor 7 is installed inside the boss 6, the optical fiber temperature sensor 7 is threadedly matched with the internal threaded tube 601 through the external threaded groove 701, so as to adjust the position of the detection end of the optical fiber temperature sensor 7 in the threading cavity 9;

[0023] A locking nut 702 is installed at one end of the surface of the external thread groove 701, and a locking gasket 703 is installed on the surface of the optical fiber temperature sensor 7 on one side of the locking nut 702. The locking nut 702 and the external thread groove 701 are limited at the end of the protruding column 6. By adjusting the distance, it can be ensured that the distance between the sensor detection head and the outer wall of the cable meets the optimal measurement requirements, and by adjusting the distance, it can be avoided that the sensor detection head and the outer wall of the cable rub or collide, thereby reducing the risk of sensor damage. Moreover, through the multi-point distribution of the optical fiber temperature sensors 7, even if one of the sensors fails, the other sensors can still work normally, thereby ensuring the stability and reliability of the temperature monitoring system.

[0024] The lower pipe support 3 and the upper pipe support 4 are both made of PVC material. Compared with traditional materials such as metal, PVC material is lighter, but its strength is very high and can withstand a certain weight and pressure;

[0025] The cable suspension and centering structure 10 includes a U-shaped seat 1001 installed on the inner wall of one side of the lower tube support 3 and the upper tube support 4, and a short shaft 1002 rotatably installed inside the U-shaped seat 1001. A support arm 1003 is fixed to one end of the surface of the short shaft 1002. A notch 1004 is provided at one end of the support arm 1003 close to the short shaft 1002. A torsion spring 1005 is installed on the surface of the short shaft 1002. When the cable is located in the threading cavity 9, the cable is lifted and supported by multiple cable suspension and centering structures 10. Taking the cable suspension and centering structure 10 in the upper tube support 4 as an example, the support arm 1003 swings clockwise with the short shaft 1002 as the center under the action of the gravity of the cable. At this time, the torsion spring 1005 is deformed, thereby lifting and supporting the cable, and suspending the cable on the central axis of the tube support, which can avoid friction and extrusion between the cable and the supporting structure and reduce wear and damage to the cable sheath.

[0026] When the embodiment of the present application is in use, the staff first takes out the lower tube support 3 and the upper tube support 4 to be used, and the staff installs the lower tube support 3 on the lower half of the power cable. At this time, the two cable suspension centering structures 10 in the lower tube support 3 hold up the lower half of the power cable. Then the staff buckles the upper tube support 4 above the lower tube support 3 and bolts the lower tube support 3 and the upper tube support 4 together. At this time, the power cable is covered by the lower tube support 3 and the upper tube support 4, and multiple cable suspension centering structures 10 make the power cable stably located on the central axis of the lower tube support 3 and the upper tube support 4. By placing the power cable on the central axis of the lower tube support 3 and the upper tube support 4, it can be ensured that the four sensors are evenly distributed on the power cable. The fiber optic temperature sensors 7 are installed around the cable to realize all-round temperature monitoring of the cable. After the installation position of the power cable is debugged, the staff takes out four fiber optic temperature sensors 7 again, so that the fiber optic temperature sensors 7 are threadedly installed inside the protruding column 6, and the distance between the detection head of the fiber optic temperature sensor 7 and the outer wall of the power cable is continuously adjusted. Two fiber optic temperature sensors 7 are respectively installed at the symmetrical positions of the lower pipe support 3 and the upper pipe support 4, which can realize temperature monitoring of different positions of the outer wall of the cable and eliminate the local temperature difference caused by single-point temperature measurement. In this way, the temperature distribution of the outer wall of the cable is fully understood, and local temperature anomalies are discovered in time, thereby effectively preventing the occurrence of problems such as cable overload and short circuit.

[0027] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. An optical fiber sensor device embedded in a smart grid power cable, characterized in that: The invention comprises a foot support (1) and a base (2) mounted on the top of the foot support (1), wherein a lower pipe support (3) is fixed on the top of the base (2), an upper pipe support (4) for bolting to the lower pipe support (3) is arranged on the upper surface of the lower pipe support (3), the lower pipe support (3) and the upper pipe support (4) enclose a threading cavity (9) for embedding power cables, the bottom of the lower pipe support (3) and the top of the upper pipe support (4) are both provided with two symmetrical cable suspension centering structures (10) for supporting power cables, the outer walls of both sides of the lower pipe support (3) and the upper pipe support (4) are both provided with bosses (6), and the internal threads of the bosses (6) are provided with optical fiber temperature sensors (7).

2. The optical fiber sensor device embedded in a smart grid power cable according to claim 1, characterized in that: Wing edges (5) are fixed on both side outer walls of the lower pipe support (3) and the upper pipe support (4), and positioning holes (501) for bolts to enter are arranged on both sides of the inside of the wing edges (5).

3. The optical fiber sensor device embedded in a smart grid power cable according to claim 1, characterized in that: An internally threaded tube (601) is fixed inside the protruding column (6), and through holes (8) which are concentric with the internally threaded tube (601) are provided on both inner walls of the lower tube support (3) and the upper tube support (4).

4. The optical fiber sensor device embedded in a smart grid power cable according to claim 3, characterized in that: The outer surface of the optical fiber temperature sensor (7) is provided with an external thread groove (701), and the external thread groove (701) and the internal thread tube (601) are threadably matched.

5. The optical fiber sensor device embedded in a smart grid power cable according to claim 4, characterized in that: A locking nut (702) is installed on one end of the surface of the external thread groove (701), and a locking gasket (703) is mounted on the surface of the optical fiber temperature sensor (7) on one side of the locking nut (702).

6. The optical fiber sensor device embedded in a smart grid power cable according to claim 1, characterized in that: The lower pipe support (3) and the upper pipe support (4) are both made of PVC material.

7. The optical fiber sensor device embedded in a smart grid power cable according to claim 1, characterized in that: The cable suspension centering structure (10) comprises a U-shaped seat (1001) installed on the inner wall of one side of the lower tube support (3) and the upper tube support (4), and a short shaft (1002) rotatably installed inside the U-shaped seat (1001), a support arm (1003) is fixed to one end of the surface of the short shaft (1002), a notch portion (1004) is provided at one end of the support arm (1003) close to the short shaft (1002), and a torsion spring (1005) is installed on the surface of the short shaft (1002).

Images