A preformed rubber insulator implementing electrical stress control

Abstract

The application provides a prefabricated rubber insulator for realizing electric stress control, and belongs to the technical field of power cable accessories; the prefabricated rubber insulator comprises an insulating assembly, the insulating assembly comprises an end semi-conductive which is sleeved on the outer side of a cable, and an insulator is fixedly connected to the outer wall of the end semi-conductive. In use, the insulating assembly is sleeved on the surface of a processed cable, the insulating sleeve is installed after the installation of the insulating assembly, the second high-voltage shielding electrode is prefabricated on the inner wall of the insulating sleeve, the other end of the insulator is provided with the first high-voltage shielding body, the effect of optimizing the equipotential line distribution at the second high-voltage shielding electrode is achieved, and through computer simulation calculation, it is found that this structure reduces the surface field intensity of the cable and the insulator, reduces the surface field intensity of the insulator and the insulating sleeve, reduces the surface field intensity of the umbrella skirt of the outer surface of the insulating sleeve, and effectively improves the reliability and safety margin of the product.

Description

Technical Field

[0001] This invention relates to the field of power cable accessories technology, and in particular to a prefabricated rubber insulator for achieving electrical stress control. Background Technology

[0002] XLPE cable is a cross-linked polyethylene cable that plays an extremely important role in the power grid. Existing prefabricated rubber insulators used for 66kV and above XLPE cable connections are prefabricated as a whole, consisting of an insulation body and semi-conductive ends. The ends of the prefabricated rubber insulator do not contain high-voltage shielding electrodes.

[0003] Computer simulation calculations of existing products revealed that the lack of high-voltage shielding electrodes at the ends of existing prefabricated rubber insulators resulted in uneven and concentrated distribution of equipotential lines at the high-voltage shielding electrodes within the insulating sleeve. Furthermore, the absence of high-voltage shielding electrodes at the ends of the prefabricated rubber insulators caused the overall equipotential line distribution to shift outwards, leading to a larger structural size of the high-voltage shielding electrodes in the insulating sleeve. This resulted in increased product size, weight, and production costs. Therefore, this application provides a prefabricated rubber insulator for achieving electrical stress control to meet the requirements. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a prefabricated rubber insulator for realizing electrical stress control, so as to solve the problem that the existing prefabricated rubber insulator does not have a high-voltage shielding electrode at the end, which causes the equipotential line distribution at the high-voltage shielding electrode in the insulating sleeve to be uneven and more concentrated. In addition, since the prefabricated rubber insulator does not have a high-voltage shielding electrode at the end, the overall distribution of the equipotential line in the product is shifted outward, and the structure size of the high-voltage shielding electrode in the insulating sleeve is large, which increases the product structure size, weight, and production cost.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A prefabricated rubber insulator for controlling electrical stress includes an insulation component. The insulation component includes an end semiconductor sleeved on the outside of a cable. An insulator is fixedly connected to the outer wall of the end semiconductor. A first high-voltage shielding electrode is fixedly connected to the inner wall of the insulator. Both the insulator and the first high-voltage shielding electrode are sleeved on the cable. A pair of first limiting grooves are formed on the first high-voltage shielding electrode. A second limiting groove is formed on the outer wall of each first limiting groove. A push block is slidably connected to the inner wall of the second limiting groove. A second high-voltage shielding electrode is provided on the first high-voltage shielding electrode and is disposed on the inner wall of an insulating sleeve. Both the second high-voltage shielding electrode and the insulating sleeve are sleeved on the cable. The device also includes a measuring component for detecting the length of the outer sheath to be stripped from the cable.

[0006] Preferably, the pusher is made of silicone rubber.

[0007] Preferably, the first high-voltage shielding electrode and the second high-voltage shielding electrode are made of the same material.

[0008] Preferably, the insulator is made of silicone rubber.

[0009] Preferably, one side of the second high-voltage shielding electrode abuts against the outer wall of the first high-voltage shielding electrode.

[0010] Preferably, both the end semiconductor and the insulator are manufactured using a one-time molding process.

[0011] Preferably, the measuring component includes a pair of limiting blocks slidably connected to a pair of first limiting grooves. Each limiting block has a third limiting groove. A limiting spring is fixedly connected to the inner wall of each third limiting groove. A protrusion is fixedly connected to one end of the limiting spring. The protrusion is slidably connected to the third limiting groove and abuts against one side of the push block. A first fixing block is fixedly connected to the top of the limiting block. A plurality of measuring rods are fixedly connected to the top of the first fixing block. A second fixing block is fixedly connected to the top of the measuring rods.

[0012] Preferably, the measuring rod is provided with scale lines.

[0013] Preferably, the protrusion is made of metal, and a rubber pad is provided on the outer wall of the protrusion.

[0014] Preferably, the measuring rod is made of a corrosion-resistant metal.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects: In the above scheme, the first high-voltage shielding electrode is set up. During use, the end semiconductor, the first high-voltage shielding electrode, and the insulator are prefabricated first. Then, the end semiconductor, the first high-voltage shielding electrode, and the insulator are prefabricated into an insulating assembly. When the insulating assembly needs to be installed, the outer sheath of the cable is first removed, then all the semi-conductive buffer layer above the end of the cable's metal sheath is removed, exposing the core. The end of the semi-conductive layer on the cable is treated into a slope approximately 20-30mm long, and the slope is polished with coarse sandpaper to ensure a smooth transition with the insulation layer. No knife marks or peeling marks are allowed on the semi-conductive slope. The surface is smooth and flat. The insulation components are then fitted onto the treated cable surface. After the insulation components are installed, the insulation sleeve is installed. The second high-voltage shielding electrode is prefabricated on the inner wall of the insulation sleeve. One end of the insulator is provided with a semiconducting end, and the other end is provided with the first high-voltage shielding body. This achieves the effect of optimizing the equipotential line distribution at the second high-voltage shielding electrode. At the same time, computer simulation calculations show that this structure reduces the surface field strength of the cable and insulator, reduces the surface field strength of the insulator and insulation sleeve, and reduces the surface field strength of the umbrella skirt on the outer surface of the insulation sleeve, effectively improving the reliability and safety margin of the product.

[0016] By setting the first high-voltage shielding electrode, which is located at the end of the insulator during production, the equipotential line distribution of the product will not shift outward, reducing the structural size of the second high-voltage shielding electrode inside the insulating sleeve, thus reducing the overall product size and weight, and effectively reducing production costs.

[0017] The measuring rod is designed so that, during use, the operator presses the protrusion into the third limiting groove, at which point the limiting spring is compressed. The limiting block is then placed tightly in the first limiting groove. The first fixing block is rotated until the protrusion abuts against the push block. Under the force of the limiting spring, the protrusion pops out and returns to its original position. The push block is then pushed out, and the measuring rod is installed. The second fixing block at the top of the measuring rod abuts against the top of the inner wall of the insulating sleeve, ensuring that the length of the measuring rod plus the length of the insulator equals the length of the outer sheath to be stripped from the cable. The operator can mark the cable according to the length of the measuring rod plus the insulator, and then strip the outer sheath accordingly. This allows for precise measurement of the stripped length, avoiding errors that can occur when using a tape measure. After marking, the user can press the push block to move the protrusion into the third limiting groove, and then rotate the first fixing block to remove the measuring rod, preventing any impact on the subsequent installation of the insulating sleeve. The measuring rod is reusable, increasing the frequency of use and reducing production costs. Attached Figure Description

[0018] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments of the present disclosure and, together with the specification, further serve to explain the principles of the present disclosure and enable those skilled in the art to implement and use the present disclosure.

[0019] Figure 1 A first-view three-dimensional structural diagram of a prefabricated rubber insulator for achieving electrical stress control; Figure 2 A schematic diagram of a partially cut-out three-dimensional structure of a prefabricated rubber insulator from a second perspective for achieving electrical stress control; Figure 3 A first-view perspective stereoscopic diagram of the assembly of the insulation and measurement components; Figure 4 A partial cutaway stereoscopic view of the assembly of the insulation and measurement components from a second perspective. Figure 5 for Figure 4 Enlarged structural diagram at point A in the middle.

[0020] [Figure Labels] 1. Cable; 2. Insulating component; 3. End semiconductor; 4. Insulator; 5. First high-voltage shielding electrode; 6. Second high-voltage shielding electrode; 7. Insulating sleeve; 8. First limiting groove; 9. Second limiting groove; 10. Push block; 11. Measuring component; 12. Limiting block; 13. Third limiting groove; 14. Limiting spring; 15. Protrusion; 16. First fixing block; 17. Measuring rod; 18. Second fixing block.

[0021] As shown in the figure, specific structures and devices are labeled in the figure to clearly illustrate the structure of the embodiments of the present invention. However, this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. Those skilled in the art can adjust or modify these devices and environments according to specific needs, and such adjustments or modifications are still included in the scope of the appended claims. Detailed Implementation

[0022] The following is a detailed description of a prefabricated rubber insulator for achieving electrical stress control provided by the present invention, with reference to the accompanying drawings and specific embodiments. It should be noted that, to make the embodiments more detailed, the following embodiments are the best and preferred embodiments; those skilled in the art can also use other alternative methods to implement some known technologies; and the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0023] It should be noted that the use of terms such as "an embodiment," "an embodiment," "an exemplary embodiment," and "some embodiments" in the specification indicates that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, when describing a specific feature, structure, or characteristic in conjunction with embodiments, implementing such a feature, structure, or characteristic in conjunction with other embodiments should be within the knowledge of those skilled in the art.

[0024] Generally, terms can be understood at least partly from their use in context. For example, depending at least partly on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in a singular sense, or a combination of features, structures, or characteristics in a plural sense. Additionally, the term "based on" can be understood not necessarily to convey an exclusive set of factors, but rather, alternatively, depending at least partly on the context, to allow for the presence of other factors that are not necessarily explicitly described.

[0025] It is understood that the meanings of “on”, “above” and “above” in this disclosure should be interpreted in the broadest sense, such that “on” means not only “directly on” something, but also includes something with an intermediary feature or layer, and that “above” or “above” means not only “on” something, but also includes something “above” or “above” without an intermediary feature or layer.

[0026] Furthermore, spatially related terms such as “below,” “under,” “lower,” “above,” and “upper” are used herein for convenience to describe the relationship of one element or feature to one or more other elements or features, as illustrated in the accompanying drawings. Spatially related terms are intended to cover different orientations in the use or operation of the device other than those depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially related descriptive terms used herein can be interpreted similarly.

[0027] like Figure 1-5As shown, an embodiment of the present invention provides a prefabricated rubber insulator for achieving electrical stress control, including an insulation component 2. The insulation component 2 includes an end semiconductor 3 sleeved on the outside of a cable 1. An insulator 4 is fixedly connected to the outer wall of the end semiconductor 3. A first high-voltage shielding electrode 5 is fixedly connected to the inner wall of the insulator 4. Both the insulator 4 and the first high-voltage shielding electrode 5 are sleeved on the cable 1. A pair of first limiting grooves 8 are formed on the first high-voltage shielding electrode 5. A second limiting groove 9 is formed on the outer wall of each first limiting groove 8. A push block 10 is slidably connected to the inner wall of the second limiting groove 9. A second high-voltage shielding electrode 6 is provided on the first high-voltage shielding electrode 5. The second high-voltage shielding electrode 6 is disposed on the inner wall of an insulating sleeve 7. Both the second high-voltage shielding electrode 6 and the insulating sleeve 7 are sleeved on the cable 1. The invention also includes a measuring component 11, which is used to detect the length of the outer sheath to be stripped from the cable 1.

[0028] With the first high-voltage shielding electrode 5 in place, during use, the end semiconductor 3, the first high-voltage shielding electrode 5, and the insulator 4 are prefabricated first. Then, the end semiconductor 3, the first high-voltage shielding electrode 5, and the insulator 4 are prefabricated into an insulation component 2. When the insulation component 2 needs to be installed, the outer sheath on the surface of the cable 1 is first stripped off, and then all the semiconducting buffer layer above the end of the metal sheath of the cable 1 is removed to expose the wire core. The end of the semiconducting layer on the cable 1 is treated into a slope about 20-30mm long, and the slope is polished with coarse sandpaper to make it transition smoothly with the insulation layer. No knife marks or peeling marks are allowed on the semiconducting slope, and its surface is smooth. After leveling, the insulation component 2 is fitted onto the prepared cable 1 surface. After installing the insulation component 2, the insulation sleeve 7 is installed. The second high-voltage shielding electrode 6 is prefabricated on the inner wall of the insulation sleeve 7. One end of the insulator 4 is provided with a semiconducting end 3, and the other end is provided with a first high-voltage shield 5, which achieves the effect of optimizing the equipotential line distribution at the second high-voltage shielding electrode 6. At the same time, computer simulation calculations show that this structure reduces the surface field strength of the cable 1 and the insulator 4, reduces the surface field strength of the insulator 4 and the insulation sleeve 7, and reduces the surface field strength of the umbrella skirt on the outer surface of the insulation sleeve 7, effectively improving the reliability and safety margin of the product.

[0029] By setting the first high-voltage shielding electrode 5, during production, the first high-voltage shielding electrode 5 is set at the end of the insulator 4, so that the product equipotential line distribution will not shift outward, reducing the structural size of the second high-voltage shielding electrode 6 inside the insulating sleeve 7, thereby reducing the overall product structural size, reducing the product weight, and effectively reducing production costs.

[0030] In this embodiment, as Figure 2 and Figure 5As shown, the insulator 4 is made of silicone rubber, and the push block 10 is also made of silicone rubber. The silicone rubber material makes the insulation performance of the insulator 4 better, which is beneficial to the use of the insulator 4. In addition, the silicone rubber material is softer, which improves the comfort of using the push block 10.

[0031] In this embodiment, as Figure 2 As shown, the first high-voltage shielding electrode 5 and the second high-voltage shielding electrode 6 are made of the same material, which makes both the first high-voltage shielding electrode 5 and the second high-voltage shielding electrode 6 have conductive, expansion and contraction properties, and at the same time have the function of optimizing the distribution of the product's equipotential lines and homogenizing the field strength.

[0032] In this embodiment, as Figure 2 As shown, one side of the second high-voltage shielding electrode 6 abuts against the outer wall of the first high-voltage shielding electrode 5, which helps to optimize the distribution of equipotential lines at the second high-voltage shielding electrode 6, so that the distribution of equipotential lines in the product will not shift outward, reducing the structural size of the second high-voltage shielding electrode 6 inside the insulating sleeve 7, thereby reducing the overall structural size of the product, reducing the weight of the product, and effectively reducing production costs.

[0033] In this embodiment, as Figure 1 As shown, the end semiconductor 3 and the insulator 4 are both formed by a one-time molding process. The one-time molding process makes the end semiconductor 3, the insulator 4 and the first high-voltage shielding electrode 5 more compatible with the cable 1.

[0034] As one implementation method in this embodiment, such as Figure 1-5 As shown, the measuring component 11 includes a pair of limiting blocks 12 that are slidably connected to a pair of first limiting grooves 8. Each limiting block 12 has a third limiting groove 13. The inner wall of each third limiting groove 13 is fixedly connected to a limiting spring 14. One end of the limiting spring 14 is fixedly connected to a protrusion 15. The protrusion 15 is slidably connected to the third limiting groove 13 and abuts against one side of the push block 10. The top of the limiting block 12 is fixedly connected to a first fixing block 16. The top of the first fixing block 16 is fixedly connected to a plurality of measuring rods 17. The top of the measuring rods 17 is fixedly connected to a second fixing block 18.

[0035] When using the measuring rod 17, the operator presses the protrusion 15 into the third limiting groove 13. At this time, the limiting spring 14 is compressed. The limiting block 12 is placed tightly into the first limiting groove 8. The first fixing block 16 is rotated until the protrusion 15 abuts against the push block 10. Under the action of the elastic force of the limiting spring 14, the protrusion 15 pops out and returns to its original position. At this time, the push block 10 is pushed out. After the measuring rod 17 is installed, the second fixing block 18 set at the top of the measuring rod 17 just abuts against the top of the inner wall of the insulating sleeve 7, so that the length of the measuring rod 17 plus the length of the insulator 4 is the length of the cable 1 that needs to be stripped. The operator can mark the cable 1 according to the length of the outer sheath, based on the measuring rod 17 plus the length of the insulator 4. The outer sheath of the cable 1 can be stripped according to the mark, and the stripping length can be accurately measured, avoiding the error that may occur when the operator uses a tape measure to measure the cable 1. After marking, the user can press the push block 10 to make the protrusion 15 enter the third limiting groove 13, and rotate the first fixing block 16 to remove the measuring rod 17, avoiding any impact on the subsequent installation of the insulating sleeve 7. The measuring rod 17 can be reused, increasing the usage frequency of the measuring rod 17 and reducing production costs.

[0036] In this embodiment, as Figure 3 As shown, the measuring rod 17 is equipped with scale lines, which allow users to make different marks according to the different positions where different components of the cable 1 need to be stripped.

[0037] In this embodiment, as Figure 5 As shown, the protrusion 15 is made of metal, and the outer wall of the protrusion 15 is provided with a rubber pad, which makes the protrusion 15 more comfortable to use.

[0038] In this embodiment, as Figure 3 As shown, the measuring rod 17 is made of corrosion-resistant metal, preferably stainless steel, so that the measuring rod 17 is not easy to rust when used repeatedly, and avoids the measuring rod 17 being exposed to the air for a long time, so that water molecules or dust in the air can corrode the measuring rod 17.

[0039] The technical solution provided by this invention, through the setting of a first high-voltage shielding electrode, involves prefabricating an end semiconductor, a first high-voltage shielding electrode, and an insulator during use. Then, the end semiconductor, the first high-voltage shielding electrode, and the insulator are prefabricated into an insulating assembly. When the insulating assembly needs to be installed, the outer sheath of the cable is first removed, then all the semi-conductive buffer layers above the end of the cable's metal sheath are removed, exposing the core. The end of the semi-conductive layer on the cable is treated into a slope approximately 20-30mm long, and the slope is polished with coarse sandpaper to ensure a smooth transition with the insulation layer. No knife marks or peeling marks are allowed on the semi-conductive slope. The surface of the cable is smooth and flat. The insulating components are then fitted onto the treated cable surface. After the insulating components are installed, the insulating sleeve is installed. The second high-voltage shielding electrode is prefabricated on the inner wall of the insulating sleeve. One end of the insulator is provided with a semiconducting end, and the other end is provided with the first high-voltage shielding body. This achieves the effect of optimizing the equipotential line distribution at the second high-voltage shielding electrode. At the same time, computer simulation calculations show that this structure reduces the surface electric field strength along the cable and insulator, reduces the surface electric field strength along the insulator and insulating sleeve, and reduces the surface electric field strength along the umbrella skirt on the outer surface of the insulating sleeve, effectively improving the reliability and safety margin of the product.

[0040] By setting the first high-voltage shielding electrode, which is located at the end of the insulator during production, the equipotential line distribution of the product will not shift outward, reducing the structural size of the second high-voltage shielding electrode inside the insulating sleeve, thus reducing the overall product size and weight, and effectively reducing production costs.

[0041] The measuring rod is designed so that, during use, the operator presses the protrusion into the third limiting groove, at which point the limiting spring is compressed. The limiting block is then placed tightly in the first limiting groove. The first fixing block is rotated until the protrusion abuts against the push block. Under the force of the limiting spring, the protrusion pops out and returns to its original position. The push block is then pushed out, and the measuring rod is installed. The second fixing block at the top of the measuring rod abuts against the top of the inner wall of the insulating sleeve, ensuring that the length of the measuring rod plus the length of the insulator equals the length of the outer sheath to be stripped from the cable. The operator can mark the cable according to the length of the measuring rod plus the insulator, and then strip the outer sheath accordingly. This allows for precise measurement of the stripped length, avoiding errors that can occur when using a tape measure. After marking, the user can press the push block to move the protrusion into the third limiting groove, and then rotate the first fixing block to remove the measuring rod, preventing any impact on the subsequent installation of the insulating sleeve. The measuring rod is reusable, increasing the frequency of use and reducing production costs.

[0042] This invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this invention. To provide the public with a thorough understanding of this invention, specific details are described in detail in the following preferred embodiments; however, those skilled in the art will fully understand the invention even without these details. Furthermore, to avoid unnecessary misunderstanding of the essence of this invention, well-known methods, processes, procedures, components, and circuits are not described in detail.

[0043] Those skilled in the art will understand that all or part of the steps in the methods of the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc.

[0044] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A prefabricated rubber insulator for achieving electrical stress control, characterized in that, The device includes: an insulating assembly comprising an end semiconductor sleeved on the outside of the cable, an insulator fixedly connected to the outer wall of the end semiconductor, a first high-voltage shielding electrode fixedly connected to the inner wall of the insulator, both the insulator and the first high-voltage shielding electrode being sleeved on the cable, a pair of first limiting grooves being formed on the first high-voltage shielding electrode, a second limiting groove being formed on the outer wall of each first limiting groove, a push block being slidably connected to the inner wall of the second limiting groove, a second high-voltage shielding electrode being provided on the first high-voltage shielding electrode, the second high-voltage shielding electrode being provided on the inner wall of the insulating sleeve, and both the second high-voltage shielding electrode and the insulating sleeve being sleeved on the cable; It also includes a measuring component for detecting the length of the outer sheath to be stripped from the cable. The measuring component includes a pair of limiting blocks slidably connected to a pair of first limiting grooves. Each limiting block has a third limiting groove. A limiting spring is fixedly connected to the inner wall of each third limiting groove. A protrusion is fixedly connected to one end of the limiting spring. The protrusion is slidably connected to the third limiting groove and abuts against one side of the push block. A first fixing block is fixedly connected to the top of the limiting block. Multiple measuring rods are fixedly connected to the top of the first fixing block. A second fixing block is fixedly connected to the top of each measuring rod.

2. The prefabricated rubber insulator for achieving electrical stress control according to claim 1, characterized in that, The pusher is made of silicone rubber.

3. The prefabricated rubber insulator for achieving electrical stress control according to claim 1, characterized in that, The first high-voltage shielding electrode and the second high-voltage shielding electrode are made of the same material.

4. The prefabricated rubber insulator for achieving electrical stress control according to claim 1, characterized in that, The insulator is made of silicone rubber.

5. The prefabricated rubber insulator for achieving electrical stress control according to claim 1, characterized in that, One side of the second high-voltage shielding electrode abuts against the outer wall of the first high-voltage shielding electrode.

6. The prefabricated rubber insulator for achieving electrical stress control according to claim 1, characterized in that, Both the end semiconductor and the insulator are manufactured using a one-time molding process.

7. The prefabricated rubber insulator for achieving electrical stress control according to claim 1, characterized in that, The measuring rod is equipped with scale lines.

8. The prefabricated rubber insulator for achieving electrical stress control according to claim 1, characterized in that, The protrusion is made of metal, and a rubber pad is provided on the outer wall of the protrusion.

9. The prefabricated rubber insulator for achieving electrical stress control according to claim 1, characterized in that, The measuring rod is made of corrosion-resistant metal.

Images