A sensor device for cable joint monitoring protection and method of use

Abstract

The application relates to the technical field of cable joint monitoring and protection, in particular to a sensor device for cable joint monitoring and protection and a use method thereof. The sensor device comprises an explosion-proof box which is installed at a cable joint and is composed of two box bodies, and the upper and lower sides of the explosion-proof box are provided with square seats; the inner side of the square seat is provided with a connecting seat, an axle hole is formed in the connecting seat, a rotating shaft is rotationally connected in the axle hole, and the outer end of the rotating shaft is fixedly connected with a ceramic caliper with a semicircular ring structure. When the cable joint abnormally explodes, the pressure in the explosion-proof box is suddenly increased to trigger a pressure relief mechanism, a mechanical linkage device immediately releases the locking state of the ceramic caliper, the originally crossed calipers are quickly separated, the cable breakage is actively pushed away, secondary damage caused by continuous contact of the fault point is effectively prevented, and the whole process does not need external power intervention and completely relies on mechanical structure automatic response.

Description

Technical Field

[0001] This invention relates to the field of cable joint monitoring and protection technology, specifically to a sensor device and its usage method for cable joint monitoring and protection. Background Technology

[0002] Cable joints, as critical nodes in power transmission networks, endure long-term current loads, mechanical vibrations, and environmental corrosion. They are prone to localized overheating or arcing explosions due to poor contact, insulation aging, and other issues. Statistics show that most cable faults originate from joint failure. Traditional protection devices often employ rigid, fixed structures, which present the following technical bottlenecks:

[0003] Passive clamping and monitoring are lacking:

[0004] Existing devices rely on manual tightening of bolts to fix cables, which cannot adapt to joint deformation and lack a real-time clamping force feedback mechanism.

[0005] Inefficient fault isolation:

[0006] Although it can relieve pressure during an explosion, it only achieves passive pressure relief and cannot actively separate the cable break. After a fault, the distance between the breaks is usually less than 5cm, and the residual arc can easily cause a secondary short circuit, leading to an escalation of the accident.

[0007] Insufficient insulation protection:

[0008] After the explosion, the lack of isolation between cable joints makes it difficult to meet the safety maintenance requirements of high-voltage environments (>10kV).

[0009] The aforementioned deficiencies make it difficult for existing technologies to achieve intelligent monitoring and active protection of cable joints. This invention specifically proposes a mechanical-sensor collaborative solution, which overcomes the technical limitations of traditional protection devices through three innovations: dynamic clamping, pressure-triggered isolation, and self-deploying insulation barrier.

[0010] In view of this, we propose a sensor device and its usage method for monitoring and protecting cable joints. Summary of the Invention

[0011] The purpose of this invention is to provide a sensor device and method for monitoring and protecting cable joints, to solve the problems of passive clamping and monitoring deficiencies, low fault isolation efficiency, and low fault isolation efficiency mentioned in the background art. To achieve the above objective, this invention provides the following technical solution: A sensor device for monitoring and protecting cable joints, comprising an explosion-proof box consisting of two parts installed at the cable joint, with rectangular seats protruding on both the upper and lower sides of the explosion-proof box. A connecting seat is provided on the inner side of the rectangular seat, and a shaft hole is opened on the connecting seat. A rotating shaft is rotatably connected in the shaft hole, and a ceramic clamp with a semi-circular ring structure is fixedly connected to the outer end of the rotating shaft. A torsion spring is provided on the rotating shaft to push its rotation. The two ceramic clamps are driven by the rotating shaft to cross and clamp the cable in an X-shape. A sensor for monitoring the rotation amount of the rotating shaft is provided in the shaft hole.

[0012] The surface of the rotating shaft is provided with spring retaining teeth, and the inner wall of the shaft hole is provided with a retaining groove that matches the spring retaining teeth, and the retaining groove extends upward to form an annular groove for releasing the spring retaining teeth.

[0013] Preferably, a pressure relief cap with a through hole on its surface is fixedly installed on the outside of the rectangular seat, and the pressure relief cap communicates with the inside of the explosion-proof box. A sealing plug is slidably connected inside the pressure relief cap, and a spring is installed inside the pressure relief cap. The spring pushes the sealing plug down to close the communication between the through hole and the explosion-proof box.

[0014] The inner side of the rectangular seat is provided with a sliding groove, the connecting seat is slidably connected in the sliding groove, and a reset spring is provided in the sliding groove to push the connecting seat to reset.

[0015] One end of the connector is provided with a slanted opening with a through groove, and a T-shaped connecting rod is fixedly provided at the bottom of the sealing plug. When the sealing plug moves upward, the connecting rod is used to press the connector to move horizontally along the slanted opening.

[0016] Preferably, the surface of the ceramic caliper is provided with a groove, and a ceramic retaining ring is rotatably disposed in the groove. The side of the connecting end of the ceramic retaining ring is provided with a protrusion. When the two ceramic calipers abut against each other, the protrusions that collide with each other will push the ceramic retaining ring out of the groove and place it horizontally.

[0017] Preferably, the explosion-proof box integrates a temperature sensor and a partial discharge detection module, forming a multi-parameter monitoring system. The temperature sensor can detect temperature rises in cable joints due to overload or poor contact, while the partial discharge detection module can capture discharge signals caused by insulation degradation, enabling fault alarms. The box also includes a Bluetooth transmission unit that interfaces with the existing temperature / partial discharge detection module via an industrial-grade interface to establish a dual-channel data link. The transmission protocol meets the GB3836.4 explosion-proof standard, and the radio frequency power is limited to within 10dBm. For temperature data, compressed gradient change values ​​are uploaded every 5 minutes, and for partial discharge signals, PRPS spectrum characteristic parameters are transmitted in real time.

[0018] Preferably, the torsion spring adopts a double-strand helical winding structure, and the two ends of the torsion spring are provided with 30° bent positioning feet, which are respectively engaged in the rotating shaft groove and the connecting seat limiting hole. The double-strand helical structure increases the torque of the torsion spring, ensuring the constant clamping force of the ceramic caliper on the cable. The 30° bent positioning feet are engaged with the rotating shaft groove and the limiting hole to prevent the torsion spring from shifting due to vibration or frequent movement, thereby improving long-term stability.

[0019] Preferably, the contact surface between the T-shaped connecting rod and the inclined plate is a 45° inclined surface, and the end of the connecting rod is inlaid with a polytetrafluoroethylene wear-resistant block. The 45° inclined surface design efficiently converts the vertical movement of the sealing plug into the horizontal displacement of the connecting seat, reducing energy loss. The polytetrafluoroethylene wear-resistant block reduces the friction coefficient of the inclined surface contact surface, avoids jamming or wear caused by direct friction between metals, and extends the service life.

[0020] Preferably, the protrusion of the ceramic retaining ring is a hemispherical structure, and a stainless steel rotating shaft is provided in the groove. The hemispherical protrusion generates a directional collision force when the caliper is closed, ensuring that the ceramic retaining ring is accurately placed horizontally to form an insulating barrier. The stainless steel rotating shaft avoids rotation jamming caused by rust and is suitable for humid or corrosive environments.

[0021] A method of using a sensor device for monitoring and protecting cable joints includes the following steps:

[0022] S1. Pull down the ceramic caliper to lock the spring teeth into the slot. Rotate the ceramic caliper until it radially fits against the inner wall of the explosion-proof box. Tighten the torsion spring to store force. After the explosion-proof box is closed and installed, the two ceramic calipers abut against each other, causing the spring teeth to enter the annular groove to unlock. The torsion spring pushes the two ceramic calipers to rotate in opposite directions, forming an X-shaped structure to cross and abut the cable. In this way, after the explosion-proof box is installed, the ceramic caliper automatically performs an X-shaped cross-locking of the cable joint, which can effectively improve the connection stability of the cable joint. The deflection angle of the ceramic caliper can also be monitored, so the change in the cross-clamping amount of the caliper body can be used to reflect the deformation and corrosion of the joint.

[0023] S2. When the cable joint explodes, the impact inside the explosion-proof box pushes the sealing plug upward to release pressure, causing the connecting rod to squeeze the inclined opening and drive the connecting seat to move horizontally. The upper and lower ceramic clamps are misaligned and released from mutual contact. The ceramic clamps rotate and push the two broken ends of the cable joint to separate. In this way, when the cable joint is damaged, the cable joint is actively separated, reducing the fault response and avoiding the problem from being escalated due to poor contact of the residual wire.

[0024] S3. After the ceramic clamps are rotated away from the cable connector, the reset spring pushes the ceramic clamps to reset, so that the two ceramic clamps abut against each other and limit the movement. At this time, the protrusions on the ceramic clamps collide, and the ceramic retaining ring is placed horizontally in the middle of the explosion-proof box to form an insulation barrier, further reducing the possibility of the disconnected cable connector making contact through the ceramic clamps.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] In this invention, the intelligent self-locking monitoring function is:

[0027] By using a pre-tensioned torsion spring energy storage structure in conjunction with a spring-loaded locking mechanism, automatic X-shaped clamping is achieved when the explosion-proof box is closed. The change in the cross angle of the ceramic calipers can reflect the joint deformation in real time. Combined with the built-in sensor, a joint corrosion-deformation correlation database can be established to improve the accuracy of condition assessment.

[0028] In this invention, the active fault isolation function is:

[0029] When an abnormal explosion occurs at a cable joint, the pressure inside the explosion-proof box increases sharply, triggering a pressure relief mechanism. The mechanical linkage device immediately releases the locking state of the ceramic clamps, causing the clamps that were originally cross-clamped to quickly separate. This action can actively push the cable break apart, effectively preventing the fault point from continuing to contact and causing secondary damage. The entire process does not require external power intervention and relies entirely on the automatic response of the mechanical structure.

[0030] In this invention, the intelligent insulation protection function is:

[0031] After the cable breaks are separated, the system will automatically reset and start the insulation protection program. The collision when the ceramic clamp resets will trigger the specially designed retaining ring mechanism, which will cause the high-insulation ceramic retaining ring to quickly unfold and form a reliable isolation barrier between the breaks. This design not only prevents accidental contact between the breaks, but also significantly improves the insulation level and provides a safe operating environment for subsequent maintenance. Attached Figure Description

[0032] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0033] Figure 2 This is a schematic diagram of the explosion-proof box and ceramic calipers of the present invention;

[0034] Figure 3 This is a schematic diagram of the two sets of ceramic calipers in the crossed state of the present invention;

[0035] Figure 4 For the present invention Figure 3 Enlarged view of point A in the middle;

[0036] Figure 5 This is an exploded view of the ceramic caliper, connecting seat, and connecting rod of the present invention;

[0037] Figure 6 This is an exploded view of the ceramic caliper and ceramic retaining ring of the present invention;

[0038] Figure 7 This is a three-dimensional cross-sectional view of the pressure relief cap and the rectangular seat of the present invention. Figure 1 ;

[0039] Figure 8 This is a three-dimensional cross-sectional view of the pressure relief cap and the rectangular seat of the present invention. Figure 2 .

[0040] In the diagram: 1. Explosion-proof box; 2. Rectangular seat; 3. Shaft hole; 4. Connecting seat; 5. Torsion spring; 6. Rotating shaft; 7. Ceramic caliper; 8. Spring clip; 9. Slot; 10. Ring groove; 11. Pressure relief cap; 12. Spring; 13. Sealing plug; 14. Connecting rod; 15. Slide groove; 16. Return spring; 17. Angled opening; 18. Embedded groove; 19. Protrusion; 20. Ceramic retaining ring. Detailed Implementation

[0041] 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.

[0042] Please see Figures 1 to 8 This invention provides a technical solution: a sensor device for monitoring and protecting cable joints, comprising an explosion-proof box 1 consisting of two parts installed at the cable joint, with rectangular seats 2 protruding on both the upper and lower sides of the explosion-proof box 1. A connecting seat 4 is provided on the inner side of the rectangular seat 2, and a shaft hole 3 is provided on the connecting seat 4. A rotating shaft 6 is rotatably connected in the shaft hole 3, and a ceramic clamp 7 with a semi-circular ring structure is fixedly connected to the outer end of the rotating shaft 6. A torsion spring 5 is provided on the rotating shaft 6 to push it to rotate. The two ceramic clamps 7 are driven by the rotating shaft 6 to cross and clamp the cable in an X-shaped structure. A sensor for monitoring the rotation of the rotating shaft 6 is provided in the shaft hole 3.

[0043] The surface of the rotating shaft 6 is provided with spring retaining teeth 8, and the inner wall of the shaft hole 3 is provided with a retaining groove 9 that matches the spring retaining teeth 8, and the retaining groove 9 extends upward to form an annular groove 10 for releasing the spring retaining teeth 8.

[0044] The rectangular base 2 is fixedly provided with a pressure relief cap 11 with a through hole on its surface, and the pressure relief cap 11 is connected to the inside of the explosion-proof box 1. A sealing plug 13 is slidably connected inside the pressure relief cap 11, and a spring 12 is provided inside the pressure relief cap 11. The spring 12 pushes the sealing plug 13 down to close the through hole and the communication with the explosion-proof box 1.

[0045] The inner side of the rectangular seat 2 is provided with a sliding groove 15, the connecting seat 4 is slidably connected in the sliding groove 15, and a reset spring 16 is provided in the sliding groove 15 to push the connecting seat 4 to reset.

[0046] One end of the connecting seat 4 is provided with a slanted opening 17 with a through groove, and a T-shaped connecting rod 14 is fixedly provided at the bottom of the sealing plug 13. When the sealing plug 13 moves upward, the connecting rod 14 is used to press the connecting seat 4 to move horizontally along the slanted opening 17.

[0047] The surface of the ceramic caliper 7 is provided with a groove 18, and a ceramic retaining ring 20 is rotatably disposed in the groove 18. A protrusion 19 is provided on the side of the connecting end of the ceramic retaining ring 20. When the two ceramic calipers 7 abut against each other, the protrusion 19 collides with each other and pushes the ceramic retaining ring 20 out of the groove 18 and places it horizontally.

[0048] 1. Implementation of the device structure

[0049] Explosion-proof box assembly:

[0050] It adopts a split aluminum alloy box body, which is connected by explosion-proof bolts. The upper and lower rectangular seats 2 of the box body are reserved with mounting holes for the rotating shaft 6.

[0051] The pressure relief cap 11 is fixed to the outside of the rectangular seat 2 by threads, and has a built-in polyurethane sealing plug 13 and a stainless steel spring 12.

[0052] Ceramic caliper system:

[0053] The rotating shaft 6 is made of 40Cr alloy steel, with annular spring teeth 8 machined on the surface, and a groove 9 with a depth of 1.5mm inside the shaft hole 3.

[0054] The torsion spring 5 is made of double-stranded 316 stainless steel, and the 30° bent positioning foot is interference-fitted with the groove of the rotating shaft 6.

[0055] Monitoring module integration:

[0056] The temperature sensor PT100 and the partial discharge detection module (frequency band 3-50MHz) are encapsulated in epoxy resin on the side wall of the explosion-proof box 1, with a sampling interval of 10 seconds.

[0057] 2. Workflow Implementation

[0058] Step S1: Install self-locking mechanism:

[0059] ① Manually pull down the ceramic caliper 7 to make the spring clip 8 engage with the slot 9, and rotate 90° until it is against the box wall.

[0060] ② When the explosion-proof box 1 is closed, the clamping pressure causes the spring clip 8 to slide into the annular groove 10, and the torsion spring 5 releases, driving the clamp to clamp the cable at a 60° cross angle.

[0061] Step S2: Fault Isolation

[0062] ① When the internal pressure is greater than 0.3 MPa, the sealing plug 13 compresses the spring 12 and moves it upward by 10 mm.

[0063] ②The T-shaped connecting rod 1445° inclined plane pushes the connecting seat 4 to a horizontal displacement of 7mm, and the distance between the misaligned and separated caliper break is ≥15cm.

[0064] Step S3 Insulation Protection:

[0065] The return spring 16 has a stiffness coefficient of 20 N / m to push the caliper to reset; the hemispherical protrusion 19 has an impact force of ≥1.2 N; and the ceramic retaining ring 20 rotates 90° to form a 3 mm thick insulating layer.

[0066] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sensor device for monitoring and protecting cable joints, characterized in that, include: An explosion-proof box (1) consisting of two parts has rectangular seats (2) protruding on its upper and lower sides. The inner side of the rectangular seat (2) is provided with a connecting seat (4) with a shaft hole (3). The shaft hole (3) is rotatably connected to the rotating shaft (6) through a torsion spring (5). The outer end of the rotating shaft (6) is fixed with a ceramic caliper (7) of a semi-circular ring structure. The two ceramic calipers (7) clamp the cable in an X-shape under the action of the torsion spring (5). The rotating shaft (6) has spring teeth (8) on its surface, and the shaft hole (3) has a groove (9) and a release ring groove (10) on its inner wall to lock and release in conjunction with the spring teeth (8). The rectangular seat (2) is provided with a pressure relief cap (11) on the outside. Its through hole is opened and closed by a spring (12) pushing the sealing plug (13). The bottom of the sealing plug (13) is fixed with a T-shaped connecting rod (14). The inner side of the rectangular seat (2) is provided with a sliding groove (15) for accommodating the connecting seat (4), and a return spring (16) is provided in the sliding groove (15). The connecting seat (4) has a slanted opening (17) with a through groove. When the sealing plug (13) moves upward, the connecting rod (14) squeezes the slanted opening (17) to drive the connecting seat (4) to move horizontally, so that the two ceramic clamps (7) are misaligned and released from mutual contact, and rotated to push away the cable break. The ceramic caliper (7) has a groove (18) on its surface. A ceramic retaining ring (20) with a protrusion (19) is rotatably provided in the groove (18). When the two calipers come into contact, the ceramic retaining ring (20) is horizontally placed to form an insulating barrier by colliding with the protrusion (19).

2. The sensor device for monitoring and protecting cable joints according to claim 1, characterized in that: The explosion-proof box (1) integrates a temperature sensor and a partial discharge detection module.

3. A sensor device for monitoring and protecting cable joints according to claim 2, characterized in that: The torsion spring (5) adopts a double-strand spiral winding structure. The two ends of the torsion spring (5) are provided with positioning feet bent at 30°, which are respectively engaged in the groove of the rotating shaft (6) and the limiting hole of the connecting seat (4).

4. A sensor device for monitoring and protecting cable joints according to claim 3, characterized in that: The contact surface between the T-shaped connecting rod (14) and the inclined plate (17) is a 45° inclined surface, and the end of the connecting rod (14) is inlaid with a polytetrafluoroethylene wear-resistant block.

5. A sensor device for monitoring and protecting cable joints according to claim 4, characterized in that: The protrusion (19) of the ceramic retaining ring (20) is a hemispherical structure, and a stainless steel rotating shaft (6) is provided in the groove (18).

6. A method of using a sensor device for monitoring and protecting cable joints, comprising using the sensor device for monitoring and protecting cable joints as described in claim 5, characterized in that, Includes the following steps: S1. Pull down the ceramic caliper (7) to lock the spring tooth (8) with the slot (9), rotate the ceramic caliper (7) to radially fit the inner wall of the explosion-proof box (1), tighten the torsion spring (5) to store force, and after the explosion-proof box (1) is closed and installed, the two ceramic calipers (7) abut against each other to make the spring tooth (8) enter the ring groove (10) to unlock, and the torsion spring (5) pushes the two ceramic calipers (7) to rotate in opposite directions and form an X-shaped structure to cross and abut the cable; S2. When the cable joint explodes, the impact inside the explosion-proof box (1) pushes the sealing plug (13) to move upward to release pressure, causing the connecting rod (14) to squeeze the oblique opening (17) and drive the connecting seat (4) to move horizontally. The upper and lower ceramic clamps (7) are misaligned and release their mutual contact. The ceramic clamps (7) rotate to push the two broken ends of the cable joint to separate. S3. After the ceramic caliper (7) is rotated away from the cable connector, the reset spring (16) pushes the ceramic caliper (7) to reset, so that the two ceramic calipers (7) abut against each other and limit the movement. At this time, the protrusions (19) on the ceramic caliper (7) collide, so that the ceramic retaining ring (20) is placed horizontally in the middle of the explosion-proof box (1) to form an insulating barrier.

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