Grading ring for ultra-high and extra-high voltage wave trapper

Abstract

The utility model discloses a grading ring for an ultra-high and extra-high voltage wave trapper, which relates to the technical field of power transmission and comprises a plurality of arc-shaped grading tube bodies, two ends of the arc-shaped grading tube bodies are provided with plugging holes, and positions of the arc-shaped grading tube bodies close to the plugging holes are provided with through holes. An insulation head used for splicing the arc-shaped voltage-sharing pipe bodies to form an annular shape is arranged between the arc-shaped voltage-sharing pipe bodies, and pins used for being matched with the insulation head to lock the arc-shaped voltage-sharing pipe bodies and the insulation head are arranged in the penetrating holes. According to the utility model, the grading ring formed by splicing the plurality of arc-shaped grading tube bodies and the insulating heads is arranged, so that the practical radio shielding effect is better, the size of the grading ring is small, the cost is lower compared with the prior art, and meanwhile, the spliced structure is convenient to install.

Description

Technical Field

[0001] The utility model relates to the technical field of power transmission, in particular to a grading ring for an ultra-high and extra-high voltage line trap. Background Art

[0002] In current ultra-high voltage and extra-high voltage power transmission and transformation projects of the power grid, products such as transformers, reactors, and line traps not only have to withstand extremely high voltages and large current impacts, but also have to withstand lightning impulse voltages at a certain voltage level.

[0003] As a common auxiliary structure, the grading ring aims to effectively distribute voltage when the reactor operates at the rated voltage, avoid electric field concentration and discharge problems, and improve the reliability and safety of the equipment. It usually adopts a multi-stage structure, and by evenly distributing the voltage to each unit, the local electric field intensity is reduced, thereby extending the service life of the reactor and improving its performance.

[0004] The currently common grading rings in the power grid are divided into segmented type and integral type. Among them, an insulating rod is used to separate the two aluminum rings of the integral type. And the commonly used grading rings are all made of pure aluminum material. Aluminum is relatively soft. When a large short-circuit current flows through or resonance occurs, under the huge impact force, the grading ring will be deformed, thus failing to achieve the optimal shielding effect.

[0005] Moreover, in order to ensure that the product will not interfere with the surrounding radio communications during operation, actual line traps need to conduct radio interference experiments. Ultra-high voltage and extra-high voltage power transmission systems have relatively high requirements for radio interference voltage, and also have relatively high requirements for the shielding of the grading ring. The size of the traditional pure aluminum grading ring will be made very large, resulting in a larger stress range and more serious deformation of the grading ring during actual impact.

[0006] For the above problems, the prior art provides two technical solutions: 1. Replace the material of the grading ring with stainless steel; 2. Reduce the pipe diameter of the grading ring to reduce the stress area.

[0007] Although these two solutions can solve the existing problems, replacing the material with stainless steel has too high a cost. And in actual tests, under ultra-high voltage and extra-high voltage conditions, the shielding effect of products with a smaller pipe diameter is poor, and obvious discharge phenomena occur in the overall coil. At the same time, the prior art all adopts single support fixation, and the overall seismic resistance is weak.

[0008] In view of the above problems, we provide a grading ring for an ultra-high and extra-high voltage line trap to solve the above-mentioned problems. Content of the Utility Model

[0009] The purpose of the utility model is to provide a grading ring for an ultra-high and extra-high voltage line trap to solve the problems raised in the above background art.

[0010] To achieve the above object, the utility model provides the following technical solutions:

[0011] A grading ring for a super and extra high voltage line trap comprises a plurality of arc grading tubes. Plugging holes are formed at both ends of the plurality of arc grading tubes. Perforations are formed at positions of the arc grading tubes close to the plugging holes. An insulating head for splicing the arc grading tubes to form a ring is arranged between the arc grading tubes. Pins for cooperating with the insulating head to lock the arc grading tubes and the insulating head are arranged in the perforations;

[0012] Support plates for supporting the arc grading tubes are arranged at both ends of the arc grading tubes.

[0013] As a further scheme of the utility model: The insulating head comprises an insulating rod body. A boss retaining ring is fixedly connected to the middle of the insulating rod body. The two ends of the insulating rod body are respectively plugged in the plugging holes. Pin holes matched with the perforations are arranged at both ends of the insulating rod body. The pins pass through the perforations and the pin holes to lock the insulating rod body and the arc grading tubes.

[0014] As a further scheme of the utility model: The diameter of the boss retaining ring is larger than the diameter of the plugging hole.

[0015] As a further scheme of the utility model: The support plate comprises a plate body. The plate bodies are respectively fixedly connected to both ends of the arc grading tubes. Mounting holes are formed at positions of the plate bodies far away from the arc grading tubes.

[0016] As a further scheme of the utility model: The arc grading tubes are made of aluminum.

[0017] As a further scheme of the utility model: Insulating partition components for partitioning adjacent two plate bodies are arranged between the plate bodies.

[0018] As a further scheme of the utility model: The insulating partition component comprises a plurality of partition blocks. The plurality of partition blocks are respectively arranged between adjacent two plate bodies. A connecting ring is fixedly connected between upper ends of the partition blocks. Insulating convex blocks are arranged at lower ends of the partition blocks. Threaded holes are formed at one sides of the partition blocks. Pin holes corresponding to the threaded holes are formed at the plate bodies. Screws for fixing are arranged in the pin holes and the threaded holes.

[0019] As a further scheme of the utility model: The threaded holes, the insulating convex blocks, the connecting ring, the boss retaining ring and the insulating rod body are all made of epoxy insulating material.

[0020] Compared with the prior art, the beneficial effects of the utility model are:

[0021] 1. The equalizing ring formed by splicing multiple arc-shaped equalizing pipe bodies and insulating heads provided in the utility model has a good actual radio shielding effect, and the size of the equalizing ring used is small, with lower cost compared to the prior art. At the same time, the splicing structure is convenient for installation.

[0022] 2. The utility model is provided with two support plates on each arc-shaped equalizing pipe body, and the two support plates are used for overall fixation, which can enhance the seismic resistance and avoid deformation under impact.

[0023] 3. The space between the two support plates of the utility model is separated by epoxy insulating material to avoid local overheating of the arc-shaped equalizing pipe body.

[0024] 4. The utility model uses an insulating rod to provide resistance at the place where short-circuit impact is borne, avoiding direct stress on the aluminum pipe and enhancing the overall impact resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic structural diagram of the utility model.

[0026] Figure 2 It is a schematic diagram of the partial split structure in the utility model.

[0027] Figure 3 It is a schematic structural diagram of Embodiment 2 in the utility model.

[0028] Figure 4 It is a split structure diagram of Embodiment 2 in the utility model.

[0029] Among them: 101, arc-shaped equalizing pipe body; 102, insertion hole; 103, perforation; 104, pin.

[0030] 200, insulating head; 201, pin hole; 202, convex retaining ring; 203, insulating rod body.

[0031] 300, support plate; 301, plate body; 302, mounting hole.

[0032] 400, insulating partition assembly; 401, connecting ring; 402, threaded hole; 403, partition block; 404, insulating convex block; 405, nail hole; 406, screw. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0034] Example 1

[0035] Please refer to Figures 1-4 , in the embodiment of the present utility model, a grading ring for ultra-high and extra-high voltage line traps includes a plurality of arc grading tubes 101. Plugging holes 102 are provided at both ends of the plurality of arc grading tubes 101. Perforations 103 are provided at positions of the arc grading tubes 101 close to the plugging holes 102. An insulating head 200 for splicing the arc grading tubes 101 to form a ring is provided between the arc grading tubes 101. Pin 104 for cooperating with the insulating head 200 to lock the arc grading tubes 101 and the insulating head 200 is provided in each of the perforations 103; the arc grading tubes 101 are made of aluminum; the arc grading tubes 101 are plugged end to end through the insulating head 200 and then fixed by using the pins 104, which is convenient for assembly, and the segmented arc grading tubes 101 are more convenient for carrying and transporting.

[0036] The insulating head 200 includes an insulating rod body 203. A boss retaining ring 202 is fixedly connected in the middle of the insulating rod body 203. Two ends of the insulating rod body 203 are respectively plugged into the plugging holes 102. Pin holes 201 matching the perforations 103 are provided at both ends of the insulating rod body 203. The pins 104 pass through the perforations 103 and the pin holes 201 to lock the insulating rod body 203 and the arc grading tubes 101; the diameter of the boss retaining ring 202 is larger than the diameter of the plugging holes 102. When connecting, the two ends of the insulating rod body 203 are respectively plugged into the plugging holes 102 at both ends of the corresponding arc grading tubes 101, and then fixed by using the pins 104 passing through the perforations 103 and the pin holes 201. The provided boss retaining ring 202 can separate adjacent arc grading tubes 101 to prevent the arc grading tubes 101 from contacting each other.

[0037] Support plates 300 for supporting the arc grading tubes 101 are provided at both ends of the arc grading tubes 101; the support plates 300 include plate bodies 301. The plate bodies 301 are respectively fixedly connected to both ends of the arc grading tubes 101. Mounting holes 302 are provided at positions of the plate bodies 301 far from the arc grading tubes 101; the fixed installation of the arc grading tubes 101 can be facilitated through the provided plate bodies 301 and the mounting holes 302. At the same time, two plate bodies 301 are provided on each of the arc grading tubes 101, which can enhance the seismic resistance and prevent deformation under impact.

[0038] An insulating partition component 400 for partitioning two adjacent plate bodies 301 is provided between the plate bodies 301; by providing the insulating partition component 400, local overheating can be avoided. At the same time, the setting of the insulating partition component 400 can keep a distance between the two plate bodies 301 to avoid deformation.

[0039] Embodiment 2

[0040] Please refer to Figure 3 and Figure 4 which is different from Embodiment 1 in that: the insulating partition component 400 includes a plurality of partition blocks 403 which are respectively arranged between two adjacent plate bodies 301. A connecting ring 401 is fixedly connected between the upper ends of the plurality of partition blocks 403. Insulating bumps 404 are provided at the lower ends of the partition blocks 403. Threaded holes 402 are formed in one sides of the partition blocks 403. Nail holes 405 are formed in the positions of the plate bodies 301 corresponding to the threaded holes 402. Screws 406 for fixing are arranged in the nail holes 405 and the threaded holes 402; the threaded holes 402, the insulating bumps 404, the connecting ring 401, the boss retaining ring 202 and the insulating rod body 203 are all made of epoxy insulating material; during installation, first place the partition block 403 at the position between the two plate bodies 301, then pass the screw 406 through the nail hole 405 and the threaded hole 402, and tighten the screw 406, thereby completing the installation and fixation of the partition block 403, and the assembly is convenient and fast.

[0041] The working principle of the present utility model is: during assembly, first insert the two ends of the insulating rod body 203 into the insertion holes 102 at both ends of the corresponding arc-shaped grading tube body 101 respectively, and then use a pin 104 to pass through the through hole 103 and the pin hole 201 for fixation. After the connection is completed, the arc-shaped grading tube body 101 forms a ring. Then, install the ring formed by the arc-shaped grading tube body 101 through the plate body 301 and the mounting hole 302. Then place the partition block 403 at the position between the two plate bodies 301, then pass the screw 406 through the nail hole 405 and the threaded hole 402, and tighten the screw 406. The setting of the partition block 403 can keep a distance between the two plate bodies 301 to avoid deformation.

[0042] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present utility model, the present utility model can be implemented in other specific forms. Although this specification is described according to the embodiments, not each embodiment only contains one technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A grading ring for ultra-high and extra-high voltage RF chokes, comprising a plurality of arc-shaped grading tubes (101), characterized in that: Both ends of a plurality of arc-shaped voltage equalizing pipe bodies (101) are provided with insertion holes (102). Perforations (103) are provided at positions of the arc-shaped voltage equalizing pipe bodies (101) close to the insertion holes (102). An insulating head (200) for splicing the arc-shaped voltage equalizing pipe bodies (101) to form a ring is arranged between the arc-shaped voltage equalizing pipe bodies (101). Pin shafts (104) for cooperating with the insulating head (200) to lock the arc-shaped voltage equalizing pipe bodies (101) and the insulating head (200) are arranged in the perforations (103). Support plates (300) for supporting the arc-shaped voltage equalizing pipe bodies (101) are arranged at both ends of the arc-shaped voltage equalizing pipe bodies (101).

2. The grading ring for ultra-high and extra-high voltage line traps according to claim 1, wherein The insulating head (200) includes an insulating rod body (203). A boss retaining ring (202) is fixedly connected in the middle of the insulating rod body (203). Both ends of the insulating rod body (203) are respectively inserted into the insertion holes (102). Pin holes (201) matching the perforations (103) are arranged at both ends of the insulating rod body (203). The pin shafts (104) pass through the perforations (103) and the pin holes (201) to lock the insulating rod body (203) and the arc-shaped voltage equalizing pipe bodies (101).

3. The grading ring for the ultra-high and extra-high voltage line trap according to claim 2, wherein, The diameter of the boss retaining ring (202) is larger than the diameter of the insertion hole (102).

4. The grading ring for a very high voltage or ultra-high voltage line trap according to claim 2, wherein The support plate (300) includes a plate body (301). The plate bodies (301) are respectively fixedly connected to both ends of the arc-shaped voltage equalizing pipe body (101). Mounting holes (302) are provided at positions of the plate bodies (301) far from the arc-shaped voltage equalizing pipe body (101).

5. The grading ring for a very high voltage or ultra-high voltage line trap according to claim 1, characterized in that, The arc-shaped voltage equalizing pipe body (101) is made of aluminum.

6. The grading ring for ultra-high and extra-high voltage line traps according to claim 4, characterized in that, Insulating partition components (400) for partitioning adjacent two plate bodies (301) are arranged between the plate bodies (301).

7. The grading ring for ultra-high and extra-high voltage line traps according to claim 6, wherein, The insulating partition component (400) includes a plurality of partition blocks (403). The plurality of partition blocks (403) are respectively arranged between adjacent two plate bodies (301). A connecting ring (401) is fixedly connected between the upper ends of the partition blocks (403). Insulating bumps (404) are arranged at the lower ends of the partition blocks (403). Threaded holes (402) are provided on one side of each partition block (403). Pin holes (405) corresponding to the threaded holes (402) are provided at positions of the plate bodies (301). Screws (406) for fixing are arranged in the pin holes (405) and the threaded holes (402).

8. The grading ring for a very high voltage or ultra-high voltage line trap according to claim 7, wherein The threaded holes (402), the insulating bumps (404), the connecting ring (401), the boss retaining ring (202), and the insulating rod body (203) are all made of epoxy insulating material.

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