A substation cable protection device

Abstract

The application provides a transformer substation cable protection device, and belongs to the cable protection field. The transformer substation cable protection device comprises an outer sealing plate, a protection pipe, a first rubber sleeve and a gland plate. The outer sealing plate is arranged on the outer end surface of a threading hole of a transformer substation. The side of the outer sealing plate close to the threading hole is fixedly connected with the protection pipe. The inner side of the protection pipe is provided with the first rubber sleeve matched with the protection pipe. The first rubber sleeve is sleeved on the outer side of the cable and matched with the cable. The protection pipe penetrates through the threading hole and is externally provided with the gland plate. The gland plate is fixedly installed with the protection pipe through the first bolt. The outer extension of the gland plate is circumferentially screw-connected with the second bolt at the corresponding position of the wall of the transformer substation. The second bolt is abutted against the wall of the transformer substation. According to the application, the outer sealing plate and the gland plate are abutted and stretched with the second bolt, and are fixed at the threading hole of the transformer substation. The penetrated cable is fixed and protected through the protection pipe matched with the first rubber sleeve, so that the problem of the activity abrasion of the cable at the threading hole is effectively avoided.

Description

Technical Field

[0001] This application relates to the field of cable protection, and more specifically, to a cable protection device for substations. Background Technology

[0002] Substations are key locations in power systems for voltage transformation, power reception, and distribution. Step-up substations, in particular, can boost the voltage of electricity output from generators before feeding it into the high-voltage power grid. Cables, as the core components for power transmission and equipment connection within substations, often need to penetrate through wiring holes in the substation walls for external connections in practical applications.

[0003] In existing technologies, cables are usually directly installed in the cable penetration holes of substations. Due to the inherent gap between the outer diameter of the cable and the inner diameter of the cable penetration hole, the cable is susceptible to external forces during operation, such as equipment vibration, environmental wind force, or its own thermal expansion and contraction, which can cause radial or axial movement. Long-term movement will cause the outer sheath of the cable to continuously rub against the edge of the cable penetration hole, resulting in wear on the cable surface. In severe cases, it can damage the cable insulation layer, causing safety hazards such as short circuits and leakage, which directly affect the stable operation of the substation.

[0004] Therefore, there is an urgent need to design a substation cable protection device that can restrict cable movement and prevent wear, in order to solve the above-mentioned technical problems. Utility Model Content

[0005] To overcome the above deficiencies, this application provides a substation cable protection device, which aims to improve the problem of friction between the cable outer sheath and the edge of the cable hole, causing cable surface wear and reducing the practicality of the device.

[0006] This application provides a substation cable protection device, including an outer sealing plate. The outer sealing plate is disposed on the outer end face of the substation cable hole. A protective tube is fixedly connected to the side of the outer sealing plate near the cable hole. A first rubber sleeve adapted to the inner side of the protective tube is provided. The first rubber sleeve is sleeved on the outside of the cable and adapted to the cable. A pressure plate is provided on the outer side of the end face of the protective tube away from the outer sealing plate. The first rubber sleeve is pressed between the outer sealing plate and the pressure plate. Both the outer sealing plate and the pressure plate have round holes for the cable to pass through.

[0007] In one specific implementation, the protective tube is concentrically arranged with the circular hole on the outer sealing plate, and the protective tube passes through the wire hole. The pressure plate is fixedly installed with the protective tube by the first bolt. The outer extension of the pressure plate is circumferentially threaded with a second bolt at the corresponding position of the substation wall, and the end of the second bolt is pressed against the substation wall.

[0008] In the above process, the device is fixed at the wire hole by the outer sealing plate and the pressure plate in conjunction with the tension of the second bolt, and the movement of the cable is restricted by the wrapping and limiting of the protective tube and the first rubber sleeve.

[0009] In one specific implementation, a support ring is fixedly connected to the outer side of the protective tube, and a second rubber sleeve adapted to the wire hole is sleeved on the outer side of the protective tube. The second rubber sleeve is pressed between the support ring and the pressure plate. A compression ring is fixedly connected to the pressure plate at the position corresponding to the second rubber sleeve and at the position corresponding to the first rubber sleeve. The compression rings are pressed against the second rubber sleeve and the first rubber sleeve respectively.

[0010] In the above process, the active compression of the rubber sleeve by the compression ring makes the rubber sleeve more tightly fit with the cable and the wire hole after elastic deformation, reducing the cable's movement space.

[0011] In one specific implementation, both the second rubber sleeve and the first rubber sleeve are composed of two semi-circular rubber rings spliced ​​together.

[0012] In the above process, two semi-circular rubber rings are combined inside the protective tube and the wire hole, which also facilitates the individual replacement of the rubber sleeve after it ages, without having to disassemble the entire device, thus reducing maintenance costs.

[0013] In one specific implementation, a clamping mechanism is provided between the support ring and the outer sealing plate along the circumferential direction.

[0014] In the above process, the clamping mechanism can be used to initially fix the outer sealing plate on the outside of the substation, providing a stable foundation for subsequent cable threading and pressure plate installation, and improving installation efficiency.

[0015] In one specific implementation, the clamping mechanism includes a first wedge and a second wedge, the inclined surfaces of the first wedge and the second wedge are in contact and can slide relative to each other, one side of the first wedge is in contact with the outer wall of the protective tube and can slide, and one side of the second wedge is in contact with the surface of the outer sealing plate and can slide.

[0016] In the above process, the axial force of the subsequent third bolt is converted into the radial force of the second wedge by the relative sliding of the inclined surface of the wedge block, thus ensuring initial fixation.

[0017] In one specific implementation, two T-shaped guide rods are symmetrically slidably connected through the second wedge block. One end of the T-shaped guide rod is fixedly connected to the outer wall of the protective tube. A third bolt is threaded through the first wedge block. The third bolt rotates through the support ring and the outer sealing plate, and the bolt head of the third bolt is located on the outer surface of the outer sealing plate. A clearance groove corresponding to the third bolt is provided on the second wedge block.

[0018] In the above process, the third bolt head is located on the outside of the outer sealing plate, so that the initial fixing can be completed without entering the inside of the substation, thus completely solving the problem of installation convenience.

[0019] Compared with the prior art, the beneficial effects of this application are as follows: 1. This utility model uses the outer sealing plate and the pressure plate to form a tension fixation by using the second bolt to abut against the inner wall of the substation. The device can be stably installed at the cable hole. At the same time, the protective tube forms radial support for the cable. With the wrapping and limiting of the first rubber sleeve, the movement of the cable at the cable hole is effectively restricted, fundamentally avoiding friction and wear between the cable and the edge of the cable hole.

[0020] 2. In this utility model, the compression ring on the pressure plate can axially compress the first rubber sleeve, causing the first rubber sleeve to elastically deform and tightly fit the outer wall of the cable and the inner wall of the protective tube. This not only fills the gap between the cable and the protective tube and improves the cable fixing stability, but also forms a radial buffer to reduce the transmission of cable vibration.

[0021] 3. In this utility model, the extrusion ring simultaneously applies axial compression to the second rubber sleeve, causing the second rubber sleeve to deform and fit tightly against the outer wall of the protective tube and the inner wall of the wire hole. Combined with the sealing effect of the first rubber sleeve, it achieves a gap seal, preventing impurities from entering the wire hole or the interior of the protective tube and protecting the cable insulation layer from corrosion.

[0022] 4. In this utility model, both the first and second rubber sleeves adopt a semi-circular splicing structure, and the pressure plate is detachably connected by the first bolt. When the rubber sleeves are aged or damaged, it is not necessary to disassemble the entire device. Only the pressure plate needs to be removed to replace the rubber sleeves, which reduces the difficulty and cost of maintenance.

[0023] 5. In this utility model, the rotation of the third bolt drives the first wedge block to press against the second wedge block, causing the second wedge block to slide along the T-shaped guide rod. The second wedge block presses against the inner wall of the substation's wiring hole, forming a compression fixation. This facilitates the fixing of the external sealing plate on the outside of the substation. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the installation state structure provided in the embodiments of this application. Figure 2 A partial three-dimensional view of the structure provided for an embodiment of this application. Figure 3 A partial structural cross-sectional view provided for an embodiment of this application. Figure 4 An exploded view of a partial structure provided for an embodiment of this application.

[0026] In the diagram: 1. Outer sealing plate; 2. Protective tube; 3. First rubber sleeve; 4. Pressure plate; 5. First bolt; 6. Second bolt; 7. Support ring plate; 8. Second rubber sleeve; 9. Extrusion ring; 10. Clamping mechanism; 11. First wedge block; 12. Second wedge block; 13. T-shaped guide rod; 14. Third bolt. Detailed Implementation

[0027] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0028] Please see Figure 1-4 This application provides a substation cable protection device, including an outer sealing plate 1, which is a circular flat plate that fits against the outer end face of the cable hole in the substation and is close to the external wall of the substation. A circular through hole for the cable to pass through is opened at the center of the outer sealing plate 1. The inner diameter of the through hole matches the outer diameter of the cable to ensure that there is no obvious shaking when the cable passes through. A protective tube 2 is fixedly connected to the center of the side end face of the outer sealing plate 1 facing the cable hole. A support ring 7 is welded along the axial direction on the outer wall of the protective tube 2. The support ring 7 is coaxially arranged with the protective tube 2, and the outer diameter of the support ring 7 is slightly smaller than the inner diameter of the cable hole to avoid interference with the hole wall during installation.

[0029] Both the support ring 7 and the outer sealing plate 1 have evenly distributed clearance through holes along the circumference that are compatible with the third bolt 14. The third bolt 14 rotates through the clearance through holes of the outer sealing plate 1 and the support ring 7 in sequence, and then connects with the threaded through hole of the first wedge block 11. The bolt head of the third bolt 14 is located on the outer end face of the outer sealing plate 1. The support ring 7 and the outer sealing plate 1 are evenly provided with abutting mechanisms 10 along the circumference of the protective tube 2. Each set of abutting mechanisms 10 corresponds to one third bolt 14, which is used to initially fix the outer sealing plate 1 to the outer wall of the substation before formal fixing, so as to facilitate subsequent installation and adjustment.

[0030] The clamping mechanism 10 includes a first wedge block 11 and a second wedge block 12. One side of the first wedge block 11 is an arc-shaped surface adapted to the outer wall of the protective tube 2. When the arc-shaped surface slides against the outer wall of the protective tube 2, it can reduce wear and increase friction. One side of the second wedge block 12 slides against the inner end face of the outer sealing plate 1. The other side of the first wedge block 11 is an inclined first slope, and the other side of the second wedge block 12 is a second slope that is completely adapted to the first slope. The first slope and the second slope are in contact and can slide relative to each other. When sliding, the axial thrust of the third bolt 14 can be converted into the second wedge. The radial expansion force of the second wedge block 12 is provided by an avoidance groove corresponding to the third bolt 14. The groove width is slightly larger than the diameter of the third bolt 14 to avoid interference between the third bolt 14 and the second wedge block 12 when it is tightened. The second wedge block 12 is provided with symmetrical guide holes along a direction parallel to the radial direction of the protective tube 2. A T-shaped guide rod 13 is slidably inserted through each guide hole. One end is fixed to the outer wall of the protective tube 2 by a thread, and the diameter of the limiting end of the other end is larger than the inner diameter of the guide hole, which can restrict the second wedge block 12 from disengaging from the guide rod and ensure that it can only move radially. The first wedge block 11 is provided with a threaded through hole along a direction parallel to the axial direction of the protective tube 2. The third bolt 14 is threaded through this hole. When it is tightened, it can push the first wedge block 11 to move axially, thereby causing the second wedge block 12 to expand radially and press against the inner wall of the wire hole.

[0031] The outer wall of the protective tube 2 is fitted with a second rubber sleeve 8. The second rubber sleeve 8 is composed of two symmetrical semi-circular rubber rings spliced ​​together to form a complete ring structure after being fitted. The inner diameter of the second rubber sleeve 8 is adapted to the outer diameter of the protective tube 2, and the two axial ends of the second rubber sleeve 8 are respectively pressed between the inner end face of the support ring 7 and the outer end face of the pressure plate 4. After installation, it can be squeezed and deformed to fill the gap between the protective tube 2 and the wire hole, so as to achieve sealing and shock absorption.

[0032] The axis of the protective tube 2 is collinear with the axis of the circular through hole on the outer sealing plate 1. The inner wall of the protective tube 2 is fitted with a first rubber sleeve 3, which is also composed of two symmetrical semi-circular rubber rings spliced ​​together. Its outer diameter is adapted to the inner diameter of the protective tube 2, and its inner diameter is adapted to the outer diameter of the cable. After being fitted on the outside of the cable, it can tightly wrap the cable and avoid the cable from directly contacting the protective tube 2 and causing wear.

[0033] A pressure plate 4 is provided on the outer side of the end of the protective tube 2 away from the outer sealing plate 1. Two concentric annular extrusion rings 9 are integrally formed on the end face facing the protective tube 2. The extrusion rings 9 are coaxial with the pressure plate 4. One of the extrusion rings 9 is coaxial with the first rubber sleeve 3 and abuts against the end face of the first rubber sleeve 3. It can axially extrude and deform the first rubber sleeve 3, enhancing its fit and sealing with the cable and the protective tube 2. The other extrusion ring 9 is coaxial with the second rubber sleeve 8 and abuts against the end face of the second rubber sleeve 8. Similarly, it extrudes and deforms the second rubber sleeve 8, enhancing the sealing effect at the wire hole. A circular through hole for the cable to pass through is opened at the center of the pressure plate 4. The inner diameter of the through hole is adapted to the outer diameter of the cable, and the edge is designed with rounded corners to avoid scratching the cable sheath.

[0034] The pressure plate 4 is fixedly connected to the protective tube 2 by first bolts 5 evenly distributed around the circumference. The end face of the protective tube 2 away from the outer sealing plate 1 has a threaded hole that matches the first bolt 5. The pressure plate 4 has a corresponding clearance through hole. After the first bolt 5 passes through, it is screwed into the threaded hole, which can firmly fix the pressure plate 4 to the end of the protective tube 2. The edge area of ​​the pressure plate 4 is evenly provided with second bolts 6 along the circumference. The pressure plate 4 has a threaded hole that matches the second bolt 6. When the second bolt 6 is screwed, it can pass through the threaded hole and press against the surface of the inner wall of the substation, further enhancing the connection stability between the entire device and the wall. The two ends of the first rubber sleeve 3 are respectively pressed against the inner end face of the outer sealing plate 1 and the outer end face of the pressure plate 4, forming a bidirectional axial limit to prevent the first rubber sleeve 3 from displacing when the cable is pulled.

[0035] The working principle of this substation cable protection device is as follows: The outer sealing plate 1 is attached to the outer wall of the substation cable hole. The protective tube 2 is aligned with the cable hole and inserted until the supporting ring 7 is attached to the outer wall of the substation. The third bolt 14 is rotated from the outside of the outer sealing plate 1. The third bolt 14 drives the first wedge block 11 to move axially along the protective tube 2 towards the supporting ring 7. The first inclined surface of the first wedge block 11 presses against the second inclined surface of the second wedge block 12, causing the second wedge block 12 to slide along the T-shaped guide rod 13 towards the inner wall of the cable hole until the second wedge block 12 abuts against the inner wall of the cable hole, completing the initial fixing of the outer sealing plate 1. Two semi-circular rubber rings are spliced ​​together to form the first rubber sleeve 3, which is fitted from the inside of the protective tube 2 at the preset cable insertion position. Two semi-circular rubber rings are spliced ​​together to form the second rubber sleeve 8, which is fitted from the outside of the protective tube 2. The second rubber sleeve 8 is pressed against the inner end face of the support ring 7. The cable is passed through the central through hole of the pressure plate 4, the first rubber sleeve 3, and the central through hole of the outer sealing plate 1 in sequence. The cable is adjusted to the preset position. The pressure plate 4 is attached to the end of the protective tube 2 extending to the inside of the substation. The compression ring 9 on the pressure plate 4 is aligned with the end faces of the first rubber sleeve 3 and the second rubber sleeve 8 respectively. The first bolt 5 is inserted and initially tightened. The first bolt 5 is gradually tightened. The compression ring 9 simultaneously compresses the first rubber sleeve 3 and the second rubber sleeve 8, causing them to undergo elastic deformation. The first rubber sleeve 3 is tightly attached to the cable and the protective tube 2, and the second rubber sleeve 8 is tightly attached to the protective tube 2 and the wire hole. Finally, the second bolt 6 is rotated so that the end of the second bolt 6 is pressed against the inner wall of the substation, forming a reverse tension on the outer sealing plate 1, thus completing the overall fixation of the device.

[0036] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A substation cable protection device, characterized in that: Includes an outer sealing plate (1), wherein the outer sealing plate (1) is set on the outer end face of the cable hole of the substation, and a protective tube (2) is fixedly connected to the center of the side end face of the outer sealing plate (1) facing the cable hole. A first rubber sleeve (3) adapted to it is provided on the inner side of the protective tube (2). The first rubber sleeve (3) is fitted on the outside of the cable and adapted to the cable. A pressure plate (4) is provided on the outer side of the end face of the protective tube (2) away from the outer sealing plate (1). The first rubber sleeve (3) is pressed between the outer sealing plate (1) and the pressure plate (4). Both the outer sealing plate (1) and the pressure plate (4) are provided with circular holes for the cable to pass through, wherein the inner diameter of the circular hole is adapted to the outer diameter of the cable.

2. The substation cable protection device according to claim 1, characterized in that: The protective tube (2) is concentrically set with the round hole on the outer sealing plate (1), and the protective tube (2) passes through the wire hole. The cover plate (4) is fixedly installed with the protective tube (2) by the first bolt (5). The outer extension of the cover plate (4) is circumferentially threaded with the second bolt (6) at the corresponding position of the substation wall. The end of the second bolt (6) is pressed against the substation wall.

3. A substation cable protection device according to claim 2, characterized in that: The outer side of the protective tube (2) is fixedly connected to a support ring (7), and the outer side of the protective tube (2) is fitted with a second rubber sleeve (8) that is compatible with the wire hole. The second rubber sleeve (8) is pressed between the support ring (7) and the pressure plate (4). On the pressure plate (4), there are compression rings (9) fixedly connected at the positions corresponding to the second rubber sleeve (8) and the positions corresponding to the first rubber sleeve (3). The compression rings (9) are pressed against the second rubber sleeve (8) and the first rubber sleeve (3) respectively.

4. A substation cable protection device according to claim 3, characterized in that: Both the second rubber sleeve (8) and the first rubber sleeve (3) are composed of two semi-circular rubber rings spliced ​​together.

5. A substation cable protection device according to claim 4, characterized in that: A clamping mechanism (10) is provided between the support ring (7) and the outer sealing plate (1) along the circumferential direction.

6. A substation cable protection device according to claim 5, characterized in that: The clamping mechanism (10) includes a first wedge block (11) and a second wedge block (12). The inclined surfaces of the first wedge block (11) and the second wedge block (12) are in contact and can slide relative to each other. One side of the first wedge block (11) is in contact with the outer wall of the protective tube (2) and can slide. One side of the second wedge block (12) is in contact with the surface of the outer sealing plate (1) and can slide.

7. A substation cable protection device according to claim 6, characterized in that: The second wedge block (12) has two T-shaped guide rods (13) symmetrically sliding through it. One end of the T-shaped guide rod (13) is fixedly connected to the outer wall of the protective tube (2). The first wedge block (11) has a threaded third bolt (14) through it. The third bolt (14) rotates through the support ring (7) and the outer sealing plate (1) at the same time. The bolt head of the third bolt (14) is located on the outer surface of the outer sealing plate (1). The second wedge block (12) has a clearance slot corresponding to the third bolt (14).

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