Sensor device for monitoring and protecting cable joint and use method

Abstract

The invention 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 using method, the sensor device comprises an explosion-proof box which is composed of two box bodies and is installed at a cable joint, the upper side and the lower side of the explosion-proof box are both provided with rectangular seats in a protruding mode, and the inner sides of the rectangular seats are provided with connecting seats; and a shaft hole is formed in the connecting seat, a rotating shaft is rotationally connected into the shaft hole, and the outer end of the rotating shaft is fixedly connected with ceramic calipers of a semicircular ring structure. According to the sensor device for monitoring and protecting the cable joint and the use method, when the cable joint is abnormally exploded, the pressure in the explosion-proof box is suddenly increased to trigger a pressure relief mechanism, the mechanical linkage device can immediately release the locking state of the ceramic calipers, so that the calipers which are originally clamped in a crossed manner are quickly separated, and the action can actively push away a cable fracture, so that the cable joint is protected. Secondary harm caused by continuous contact of fault points is effectively prevented, external power intervention is not needed in the whole process, and automatic response is completely depended on a mechanical structure.

Description

Technical Field

[0001] The present invention relates to the technical field of cable joint monitoring and protection, and in particular to a sensor device for cable joint monitoring and protection and a use method thereof. Background Art

[0002] Cable joints, as key nodes in power transmission networks, are subject to long-term current loads, mechanical vibration, and environmental corrosion. They are prone to local overheating or arc explosions due to poor contact and insulation aging. Statistics show that most cable failures are caused by joint failure. Traditional protective devices often use rigid fixed structures, which present the following technical bottlenecks: Passive clamping and monitoring missing: Existing devices rely on manual tightening of bolts to secure cables, are unable to adapt to joint deformation, and lack a real-time clamping force feedback mechanism.

[0003] Inefficient fault isolation: While this can relieve pressure during an explosion, it only achieves passive pressure relief and cannot actively separate the cable breaks. The distance between the breaks after a fault is typically less than 5 cm, and residual arcing can easily cause a secondary short circuit, further exacerbating the accident.

[0004] Insufficient insulation protection: After the explosion, there is a lack of isolation between the cable connectors, making it difficult to meet the safety maintenance requirements of high-voltage environments (>10kV).

[0005] These shortcomings make it difficult to achieve intelligent monitoring and active protection of cable joints with existing technologies. This invention specifically proposes a mechanical-sensor synergy solution, overcoming the technical limitations of traditional protection devices through three innovative approaches: dynamic clamping, pressure-triggered isolation, and a self-deploying insulation barrier.

[0006] In view of this, we propose a sensor device and a method for use for cable joint monitoring and protection. Summary of the Invention

[0007] The purpose of the present invention is to provide a sensor device for monitoring and protecting cable joints and a method of use, so as to solve the problems of lack of passive clamping and monitoring, low fault isolation efficiency, and low fault isolation efficiency raised in the above-mentioned background technology. In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a sensor device for monitoring and protecting cable joints, comprising an explosion-proof box composed of two parts and installed at the cable joint, and a rectangular seat is convexly provided on the upper and lower sides of the explosion-proof box, a connecting seat is provided on the inner side of the rectangular seat, and an axial hole is provided on the connecting seat, a rotating shaft is rotatably connected in the axial hole, and a ceramic caliper with a semi-circular structure is fixedly connected to the outer end of the rotating shaft, a torsion spring is provided on the rotating shaft to drive it to rotate, and the two ceramic calipers are driven by the rotating shaft to cross-clamp the cable in an x-shaped structure, and a sensor for monitoring the rotation amount of the rotating shaft is provided in the axial hole; The surface of the rotating shaft is provided with spring locking teeth, and the inner wall of the shaft hole is provided with a locking groove that matches the spring locking teeth, and the locking groove extends upward to form an annular groove for releasing the spring locking teeth.

[0008] Preferably, a pressure relief cap with a through hole on its surface is fixedly provided on the outside of the square seat, and the pressure relief cap is connected to the inside of the explosion-proof box. A sealing plug is slidably connected to the inside of the pressure relief cap, and a spring is provided in the pressure relief cap, and the spring pushes the sealing plug downward to close the communication between the through hole and the explosion-proof box; A sliding groove is provided on the inner side of the rectangular seat, the connecting seat is slidably connected in the sliding groove, and a return spring is provided in the sliding groove to push the connecting seat to return to its original position; One end of the connecting seat is provided with an oblique opening with a through groove, and a connecting rod with a T-shaped structure is fixedly provided at the bottom of the sealing plug. When the sealing plug moves upward, the connecting rod is used to squeeze the connecting seat along the oblique opening for translation.

[0009] Preferably, a groove is provided on the surface of the ceramic caliper, and a ceramic retaining ring is rotatably arranged in the groove, and a protrusion is provided on the side of the connecting end of the ceramic retaining ring. When the two ceramic calipers abut against each other, the protrusions collide with each other and squeeze the ceramic retaining ring out of the groove and place it horizontally.

[0010] Preferably, a temperature sensor and a partial discharge detection module are integrated in the explosion-proof box to form a multi-parameter monitoring system. The temperature sensor can detect the temperature rise of the cable joint due to overload or poor contact. The partial discharge detection module can capture the discharge signal caused by insulation degradation to realize fault alarm. A Bluetooth transmission unit is also provided in the box, which is connected to the original temperature / partial discharge detection module through 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. The compressed gradient change value of the temperature data is uploaded every 5 minutes, and the PRPS spectrum characteristic parameters of the partial discharge signal are transmitted in real time.

[0011] Preferably, the torsion spring adopts a double-strand helical winding structure, and both ends of the torsion spring are provided with 30° bent positioning feet, which are respectively clamped in the rotating shaft groove and the connecting seat limit hole. The double-strand helical structure increases the torsion spring torque, ensuring the constant clamping force of the ceramic caliper on the cable. The 30° bent positioning feet are clamped with the rotating shaft groove and the limit hole to prevent the torsion spring from shifting due to vibration or frequent movement, thereby improving long-term stability.

[0012] Preferably, the contact surface between the T-shaped connecting rod and the bevel is a 45° bevel, and the end of the connecting rod is inlaid with a polytetrafluoroethylene wear-resistant block. The 45° bevel 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 bevel contact surface, avoids jamming or wear caused by direct friction between metals, and extends the service life.

[0013] Preferably, the protrusion of the ceramic retaining ring is a hemispherical structure, and a stainless steel rotating shaft is provided in the embedded 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 adapts to humid or corrosive environments.

[0014] A method for using a sensor device for cable joint monitoring and protection comprises the following steps: S1. Pull down the ceramic caliper to lock the spring teeth with the slot, rotate the ceramic caliper until it radially fits the inner wall of the explosion-proof box, tighten the torsion spring to store force, and after the explosion-proof box is closed and installed, the two ceramic calipers are relatively abutted to make the spring teeth enter the ring groove to unlock, and the torsion spring pushes the two ceramic calipers to rotate in the opposite direction, forming an X-shaped structure to cross-abut the cable. After the explosion-proof box is installed, the ceramic caliper is used to automatically perform an X-shaped cross-locking on the cable connector, which can effectively improve the connection stability of the cable connector. The deflection angle of the ceramic caliper can also be monitored, so that the change in the cross angle of the caliper body can be used to reflect the deformation and corrosion of the connector. S2. When the cable connector explodes, the impact inside the explosion-proof box pushes the sealing plug upward to release the pressure, causing the connecting rod to squeeze the oblique opening and drive the connecting seat to move horizontally. The upper and lower ceramic calipers are dislocated and released from abutment with each other. The ceramic calipers rotate and push the two broken ends of the cable connector to separate. In this way, when the cable connector is damaged, the cable connector is actively separated, reducing the fault response and avoiding the escalation of the problem caused by poor contact of the residual wire. S3. After the ceramic caliper is misaligned and rotated away from the cable connector, the reset spring pushes the ceramic caliper to reset, so that the two ceramic calipers abut against each other to limit the position. At this time, the bumps on the ceramic calipers collide, causing the ceramic retaining ring to be placed horizontally in the middle position of the explosion-proof box to form an insulating barrier, further reducing the possibility of the disconnected cable connector passing through the ceramic caliper and making contact.

[0015] Compared with the prior art, the present invention has the following beneficial effects: In the present invention, the intelligent self-locking monitoring function: The pre-tightened torsion spring energy storage structure is combined with the spring tooth locking mechanism to achieve automatic X-shaped clamping when the explosion-proof box is closed. The change in the cross angle of the ceramic caliper 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 status assessment.

[0016] In the present invention, the fault active isolation function: When an abnormal explosion occurs at the cable joint, the pressure inside the explosion-proof box suddenly increases, triggering the pressure relief mechanism. The mechanical linkage device will immediately release the lock state of the ceramic caliper, allowing the originally cross-clamped calipers to quickly separate. This action can actively push the cable break open, effectively preventing the continued contact of the fault point from causing secondary hazards. The entire process does not require external power intervention and relies entirely on the automatic response of the mechanical structure.

[0017] In this invention, the intelligent insulation protection function: After the cable break is separated, the system automatically resets and starts the insulation protection program. The collision when the ceramic caliper is reset will trigger the specially designed retaining ring mechanism, causing the high-insulation performance ceramic retaining ring to quickly expand, forming a reliable isolation barrier between the breaks. This design not only prevents accidental contact of the breaks, but also significantly improves the insulation level, providing a safe operating environment for subsequent maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic structural diagram of the explosion-proof box and the ceramic caliper of the present invention; Figure 3 This is a schematic diagram of the cross-state of two sets of ceramic calipers of the present invention; Figure 4 For the present invention Figure 3 Enlarged view of point A in the middle; Figure 5 An exploded view of the ceramic caliper, connecting seat and connecting rod of the present invention; Figure 6 An exploded view of the ceramic caliper and ceramic retaining ring of the present invention; Figure 7 This is a sectional view of the three-dimensional structure of the pressure relief cap and the rectangular seat of the present invention. Figure 1 ; Figure 8 This is a sectional view of the three-dimensional structure of the pressure relief cap and the rectangular seat of the present invention. Figure 2 .

[0019] In the figure: 1. explosion-proof box; 2. rectangular seat; 3. shaft hole; 4. connecting seat; 5. torsion spring; 6. rotating shaft; 7. ceramic caliper; 8. spring tooth; 9. slot; 10. ring groove; 11. pressure relief cap; 12. spring; 13. sealing plug; 14. connecting rod; 15. slide groove; 16. return spring; 17. oblique mouth; 18. embedded groove; 19. bump; 20. ceramic retaining ring. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0021] See also Figures 1 to 8 The present invention provides a technical solution: a sensor device for monitoring and protecting cable joints, comprising an explosion-proof box 1 composed of two parts and installed at a cable joint, and a rectangular seat 2 is convexly provided on 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 an axial hole 3 is opened on the connecting seat 4, a rotating shaft 6 is rotatably connected in the axial hole 3, and a ceramic caliper 7 with a semicircular 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 promote its rotation, and the two ceramic calipers 7 are driven by the rotating shaft 6 to cross-clamp the cable in an X-shaped structure, and a sensor for monitoring the rotation amount of the rotating shaft 6 is provided in the axial hole 3.

[0022] The surface of the rotating shaft 6 is provided with a spring tooth 8 , and the inner wall of the shaft hole 3 is provided with a slot 9 that matches the spring tooth 8 , and the slot 9 extends upward to form an annular groove 10 that releases the spring tooth 8 .

[0023] A pressure relief cap 11 with a through hole on its surface is fixedly provided on the outside of the rectangular base 2, and the pressure relief cap 11 is connected to the inside of the explosion-proof box 1. A sealing plug 13 is slidably connected to the inside of 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 downward to close the connection between the through hole and the explosion-proof box 1.

[0024] A sliding groove 15 is provided on the inner side of the rectangular base 2 , and the connecting base 4 is slidably connected in the sliding groove 15 . A return spring 16 is provided in the sliding groove 15 to push the connecting base 4 to return to its original position.

[0025] One end of the connecting seat 4 is provided with an oblique opening 17 with a through groove, and a connecting rod 14 with a T-shaped structure 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 squeeze the connecting seat 4 along the oblique opening 17 for translation.

[0026] The surface of the ceramic caliper 7 is provided with an embedding groove 18, and a ceramic retaining ring 20 is rotatably arranged in the embedding 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 protrusions 19 collide with each other and squeeze the ceramic retaining ring 20 out of the embedding groove 18 and place it horizontally.

[0027] 1. Device structure implementation Explosion-proof box assembly: A split aluminum alloy box body is used, which is connected by explosion-proof bolts, and the upper and lower square seats 2 of the box body are provided with mounting holes for the rotating shaft 6.

[0028] The pressure relief cap 11 is fixed to the outside of the rectangular base 2 by screw threads, and has a polyurethane sealing plug 13 and a stainless steel spring 12 built in.

[0029] Ceramic caliper system: The rotating shaft 6 is made of 40Cr alloy steel, and an annular spring tooth 8 is processed on the surface. The depth of the groove 9 in the shaft hole 3 is 1.5 mm.

[0030] The torsion spring 5 is made of 316 stainless steel double-strand winding, and the 30° bent positioning foot is interference fit with the groove of the rotating shaft 6.

[0031] Monitoring module integration: The temperature sensor PT100 and the partial discharge detection module with a frequency band of 3-50 MHz are encapsulated on the side wall of the explosion-proof box 1 through epoxy resin, and the sampling interval is 10 seconds.

[0032] 2. Workflow implementation Step S1: Install the self-locking function: ① Manually pull down the ceramic caliper 7 to make the spring teeth 8 fit into the slot 9, and rotate it 90° until it fits against the box wall.

[0033] ② When closing the explosion-proof box 1, the pressure of the caliper causes the spring teeth 8 to slide into the ring groove 10, and the torsion spring 5 is released to drive the caliper to clamp the cable at a 60° cross angle.

[0034] Step S2: Fault isolation: ① When the internal pressure is greater than 0.3 MPa, the sealing plug 13 compresses the spring 12 and moves upward by 10 mm.

[0035] ②The 1445° inclined surface of the T-type connecting rod pushes the connecting seat 4 to move horizontally by 7mm, and the distance between the caliper dislocation and separation fracture is ≥15cm.

[0036] Step S3 Insulation protection: The reset spring 16 with a stiffness coefficient of 20 N / m pushes the caliper to reset, the collision force of the hemispherical bump 19 is ≥ 1.2 N, and the ceramic retaining ring 20 rotates 90° to form a 3 mm thick insulation layer.

[0037] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and modifications fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A sensor device for cable joint monitoring and protection, characterized in that: include: An explosion-proof box (1) consisting of two parts, with rectangular seats (2) protruding on the upper and lower sides; A connecting seat (4) with an axial hole (3) is provided on the inner side of the rectangular seat (2); a rotating shaft (6) is rotatably connected to the axial hole (3) via a torsion spring (5); a ceramic clamp (7) with a semicircular ring structure is fixed to the outer end of the rotating shaft (6); and the two ceramic clamps (7) clamp the cable in an X-shaped cross under the action of the torsion spring (5); The surface of the rotating shaft (6) is provided with a spring latch (8), and the inner wall of the shaft hole (3) is provided with a latch groove (9) and a release ring groove (10) for cooperating with the spring latch (8) to perform locking and releasing.

2. A sensor device for cable joint monitoring and protection according to claim 1, characterized in that: The outer portion of the rectangular seat (2) is provided with a pressure relief cap (11), the through hole of which is opened and closed by pushing a sealing plug (13) through a spring (12), and a T-shaped connecting rod (14) is fixed at the bottom of the sealing plug (13); A sliding groove (15) for accommodating the connecting seat (4) is provided on the inner side of the rectangular seat (2), and a return spring (16) is provided in the sliding groove (15); The connecting seat (4) is provided with an oblique opening (17) with a through groove. When the sealing plug (13) moves upward, the connecting rod (14) squeezes the oblique opening (17) to drive the connecting seat (4) to move horizontally, so that the two ceramic calipers (7) are dislocated and released from contact with each other, and rotated to push away from the cable break.

3. A sensor device for cable joint monitoring and protection according to claim 1, characterized in that: The surface of the ceramic caliper (7) is provided with an embedding groove (18), and a ceramic retaining ring (20) with a protrusion (19) is rotatably provided in the embedding groove (18). When the two calipers abut against each other, the protrusion (19) collides to cause the ceramic retaining ring (20) to be horizontally placed to form an insulating barrier.

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

5. The sensor device for cable joint monitoring and protection according to claim 1, characterized in that: The torsion spring (5) adopts a double-strand helical winding structure, and positioning feet with a 30° bend are provided at both ends of the torsion spring (5), which are respectively clamped in the groove of the rotating shaft (6) and the limiting hole of the connecting seat (4).

6. A sensor device for cable joint monitoring and protection according to claim 2, characterized in that: The contact surface between the T-shaped connecting rod (14) and the bevel (17) is a 45° bevel, and the end of the connecting rod (14) is inlaid with a polytetrafluoroethylene wear-resistant block.

7. The sensor device for cable joint monitoring and protection according to claim 3, 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 embedded groove (18).

8. A method for using a sensor device for monitoring and protecting a cable joint, using the sensor device for monitoring and protecting a cable joint as claimed in claim 3, characterized in that: The steps include: S1. Pull down the ceramic caliper (7) to lock the spring teeth (8) with the slot (9), rotate the ceramic caliper (7) until it is radially fitted to 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) are relatively abutted to make the spring teeth (8) enter the annular groove (10) to unlock, and the torsion spring (5) pushes the two ceramic calipers (7) to rotate in the opposite direction, and form an X-shaped structure to cross-abut the cable; S2. When the cable connector explodes, the impact in the explosion-proof box (1) pushes the sealing plug (13) upward to release the pressure, so that the connecting rod (14) squeezes the oblique opening (17) to drive the connecting seat (4) to move horizontally, and the upper and lower ceramic calipers (7) are dislocated and released from contact with each other, and the ceramic calipers (7) rotate to push the two fractures of the cable connector to separate; S3. After the ceramic caliper (7) is dislocated and rotated to push away 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 to limit the position. At this time, the bumps (19) on the ceramic caliper (7) collide, so that the ceramic retaining ring (20) is placed horizontally at the middle position of the explosion-proof box (1) to form an insulation barrier.

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