Contact insulator
By designing the contact sub-insulator, the junction shielding and groove structure are used to solve the problem of insufficient insulation performance of the insulator in dry air, achieving efficient insulation effect and excellent electrical performance.
Patent Information
- Application Number
- CN202421343925.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-13
- Publication Date
- 2025-03-18
- Estimated Expiration
- 2034-06-13
AI Technical Summary
Existing insulating parts cannot be effectively insulated in dry air, which is prone to flashover and creepage, and the insulation performance and arc extinguishing performance are only 1/3 of that of SF6 gas.
A contact sub-insulator is designed, including a conductive rod, an insulating layer, a skirt, a groove and a junction shield. By setting up an junction shield and a groove, the defects in the three junction areas of the insulator are shielded from the accumulation of charge and discharge.
The rated insulation level of 40.5kV switch cabinet is achieved in dry air, which is lower in cost, easier to manufacture, and has higher reliability and better electrical performance.
Smart Images
Figure CN222636954U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of power systems, in particular to a contactor insulating component. Background Art
[0002] With the progress and development of the international community, carbon emissions are increasing, and the resulting greenhouse effect has grown into a global problem. At present, the main insulating gas used in switchgear at home and abroad is SF6, which is a greenhouse gas; in the testing, maintenance and replacement of switchgear, SF6 is basically not recycled, but directly discharged into the environment, thereby exacerbating the greenhouse effect; in order to solve the environmental problems caused by SF6, both at home and abroad are seeking environmentally friendly gases that are beneficial to the environment, such as dry air, nitrogen, C4, C6 gas, etc. Among them, dry air is the main alternative gas at this stage because of its non-toxic and economic characteristics; but the insulation performance and arc extinguishing performance of dry air are only 1 / 3 of SF6 gas. The existing insulating parts used in SF6 switchgear cannot effectively insulate in switchgear with dry air as the main insulating gas, which will produce flashover and creepage.
[0003] When SF6 cabinet products are tested in dry air, the three junction areas of the insulating parts are prone to defects such as gaps and burrs due to the manufacturing process, which leads to charge accumulation and ultimately discharge flashover. Utility Model Content
[0004] The utility model aims to provide a contactor insulating component to solve the technical problem that the insulating components used under the existing insulating conditions cannot be applied to the dry air cabinet.
[0005] The utility model discloses a contact sub-insulator, comprising a conductive rod, an insulating layer is arranged on the outer jacket of the conductive rod, skirts are arranged on the upper and lower parts of the insulating layer respectively, a groove is arranged on the insulating layer of the skirt facing the conductive rod, a junction shield is arranged below the groove, and one end of the junction shield is connected to the conductive rod.
[0006] By setting up junction shielding and grooves, the technical problem of charge accumulation and discharge flashover caused by defects such as gaps and burrs generated in the manufacturing process in the three junction areas of the insulating parts can be shielded.
[0007] Furthermore, the maximum groove width L and the groove depth H1 are calculated by electric field analysis. A simulation model is established to simulate the installation state; the model is imported into the simulation software, and voltage is applied through the software to simulate the actual operation state; the software will calculate the electric field strength of each part.
[0008] Furthermore, the junction shielding shape is obtained by electric field analysis and calculation.
[0009] Furthermore, the electric field intensity along the surface in the electric field analysis calculation satisfies the theoretical field intensity along the surface under a 200 kV lightning strike of less than 2.5 kV / mm.
[0010] Furthermore, the boundary shield is a conductor or a semiconductor.
[0011] Furthermore, a nut for installation is provided in the middle of the insulating layer.
[0012] By providing the nut, the insulating member can be fixed on the cabinet body by means of the bolt.
[0013] Furthermore, a ground shield is provided in the middle of the insulation layer.
[0014] By providing a ground shield, the grounding of the entire fitting can be achieved.
[0015] Furthermore, the height of the ground shield is 60-90 mm and the length is 1.5-3 mm.
[0016] By setting the ground shield height, it is used to shield the sharp edges of the upper and lower air boxes caused by nut installation, etc.
[0017] Furthermore, the junction shielding length is 1.5~3.5mm.
[0018] Furthermore, the maximum width L of the groove is 30-40 mm, and the depth H1 of the groove is 20-40 mm.
[0019] By setting the groove size, it is possible to avoid flashover discharge caused by air breakdown due to too short a distance under the rated voltage of lightning impulse.
[0020] Furthermore, a distance H2 from the junction shield on the conductive rod to the groove is 10-20 mm.
[0021] Furthermore, the distance L2 from the boundary shield close to the nut to the edge of the contact sub-insulator is 20-30 mm.
[0022] Furthermore, the distance L3 from the boundary shielding away from the nut to the edge of the contact sub-insulator is 20-30 mm.
[0023] Furthermore, the contact sub-insulator located in the upper air chamber is connected to the breaking mechanism, and the connection between the contact sub-insulator and the outer cone bushing or the side expansion bushing is achieved through the opening and closing of the mechanism.
[0024] Furthermore, the contact sub-insulator located in the lower air chamber is connected to the sealed pole, thereby realizing the connection between the upper and lower air chamber accessories.
[0025] Furthermore, a shielding cover is provided at the connection between the contact insulator and the sealed pole.
[0026] By setting up a shielding cover, flashover caused by tips, burrs, steps, etc. caused by process problems can be shielded.
[0027] Furthermore, the shielding cover includes a semiconductive layer and an insulating cover layer.
[0028] Furthermore, the distance from the end of the semiconductive layer to the covering connection position is not less than 5 mm.
[0029] Compared with the prior art, the utility model has the following beneficial effects:
[0030] 1. The utility model series of insulating parts can achieve the rated insulation level of 40.5kV switchgear in a micro-positive pressure environment with dry air and an inflation pressure of 0~0.04MPa; compared with the current more common technical route of high-pressure environment, it has lower cost and is easier to manufacture;
[0031] 2. The series of insulation parts of this utility model can be used for cabinet structure, which is the same as the existing conventional SF6 cabinet type;
[0032] 3. The multi-shielded solid insulation structure unique to this series of insulation components has higher reliability and better electrical performance;
[0033] 4. By setting nuts, the insulating parts can be fixed to the cabinet body through bolts;
[0034] 5. By setting up a grounding shield, the grounding of the entire matching part can be achieved;
[0035] 6. By setting the ground shield height, it is used to shield the tips of the upper and lower air boxes caused by nut installation, etc.;
[0036] 7. By setting the groove size, it is possible to avoid flashover discharge caused by air breakdown due to too short a distance under the rated voltage of lightning impulse. BRIEF DESCRIPTION OF THE DRAWINGS
[0037] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.
[0038] Figure 1 This is a schematic diagram of the structure of the contactor insulation component of the utility model.
[0039] Figure 2 This is a schematic diagram of the structure of the connector insulation component of the utility model after the shielding cover is installed.
[0040] In the above drawings, the meanings of the various marks are: 1-conductive rod, 2-insulating layer, 3-skirt, 4-groove, 5-junction shield, 6-nut, 7-ground shield, 8-cabinet, 9-shielding cover, 10-semi-conductive layer, 11-insulating cover layer, 12-covering connection position. DETAILED DESCRIPTION
[0041] In order to make the purpose, technical solutions and advantages of the implementation methods of the utility model clearer, the technical solutions in the implementation methods of the utility model are clearly and completely described below. Obviously, the described implementation methods are only part of the implementation methods of the utility model, not all of the implementation methods.
[0042] Example 1
[0043] A contact insulator, such as Figure 1 As shown, it includes a conductive rod 1, an insulating layer 2 is provided on the outer cover of the conductive rod 1, and skirts 3 are respectively provided on the upper and lower parts of the insulating layer 2. A groove 4 is provided on the insulating layer 2 of the skirt 3 facing the conductive rod 1, and a junction shield 5 is provided below the groove 4, and one end of the junction shield 5 is connected to the conductive rod 1.
[0044] By providing the junction shield 5 and the groove 4, the technical problem of discharge flashover caused by charge accumulation due to defects such as gaps and burrs generated in the manufacturing process in the three junction areas of the insulating component can be shielded.
[0045] Example 2
[0046] In this embodiment, as a preferred embodiment of the utility model, the only change on the basis of embodiment 1 is that the maximum width L of the groove 4 and the depth H1 of the groove 4 are obtained by electric field analysis calculation. By establishing a simulation model, the installation state is simulated; the model is imported into the simulation software, and the voltage is applied by the software to simulate the actual operation state; the software will calculate the electric field strength of each part, and the shape of the junction shield 5 is obtained by electric field analysis calculation. In the electric field analysis calculation, the surface electric field strength meets the theoretical surface field strength of 200kV lightning impulse <2.5kV / mm, and the junction shield 5 is a conductor or a semiconductor.
[0047] Example 3
[0048] In this embodiment, as a preferred embodiment of the present utility model, Figure 1 As shown, the only change based on Example 2 is that a nut 6 for installation is provided in the middle of the insulating layer 2.
[0049] By providing the nut 6 , the insulating member can be fixed on the cabinet body 8 by means of bolts.
[0050] Example 4
[0051] In this embodiment, as a preferred embodiment of the present utility model, Figure 1 As shown, the only change based on the third embodiment is that a ground shielding 7 is provided in the middle of the insulating layer 2 .
[0052] By providing the ground shield 7 , the grounding of the entire fitting can be achieved.
[0053] Example 5
[0054] In this embodiment, as a preferred embodiment of the present utility model, Figure 1 As shown, the only improvement based on Example 4 is that the height of the ground shield 7 is 60-90 mm and the length is 1.5-3 mm.
[0055] The height of the ground shield 7 is set to shield the sharp points of the upper and lower air boxes caused by the installation of the nuts 6, etc.
[0056] Example 6
[0057] In this embodiment, as a preferred embodiment of the present utility model, Figure 1 As shown, the only improvement based on Example 5 is that the length of the boundary shield 5 is 1.5-3.5 mm.
[0058] By setting the size of the groove 4, it is possible to avoid air breakdown and flashover discharge caused by too short a distance under the rated voltage of lightning impulse.
[0059] Example 7
[0060] In this embodiment, as a preferred embodiment of the present utility model, Figure 1 As shown, the only improvement based on Example 6 is that the maximum width L of the groove 4 is 30-40 mm, and the depth H1 of the groove 4 is 20-40 mm.
[0061] By setting the size of the groove 4, it is possible to avoid air breakdown and flashover discharge caused by too short a distance under the rated voltage of lightning impulse.
[0062] Example 8
[0063] In this embodiment, as a preferred embodiment of the present utility model, Figure 1 As shown, the only improvement based on Example 7 is that the distance H2 from the junction shield 5 on the conductive rod 1 to the groove 4 is 10-20 mm.
[0064] Example 9
[0065] In this embodiment, as a preferred embodiment of the present utility model, Figure 1As shown, the only improvement based on Example 8 is that the distance L2 from the boundary shield 5 close to the nut 6 to the edge of the contact sub-insulator is 20-30 mm.
[0066] Example 10
[0067] In this embodiment, as a preferred embodiment of the present utility model, Figure 1 As shown, the only improvement based on Example 9 is that the distance L3 from the boundary shield 5 away from the nut 9 to the edge of the contact sub-insulator is 20-30 mm.
[0068] Embodiment 11
[0069] In this embodiment, as a preferred embodiment of the present utility model, Figure 2 As shown, the improvement based on Example 10 is that the contact sub-insulator located in the upper air chamber is connected to the disconnecting mechanism, and the connection between the contact sub-insulator and the outer cone sleeve or the side expansion sleeve is realized by the opening and closing of the mechanism. The contact sub-insulator located in the lower air chamber is connected to the sealed pole, so as to realize the connection of the upper and lower air chamber accessories. The connection between the contact sub-insulator and the sealed pole is provided with a shielding cover 9, and the shielding cover 9 includes a semi-conductive layer 10 and an insulating cover layer 11. The distance from the end of the semi-conductive layer 10 to the covering connection position 12 is not less than 5mm.
[0070] By providing the shielding cover 9, flashover caused by sharp points, burrs, steps, etc. caused by process problems can be shielded.
[0071] The above are the implementation methods listed in this embodiment, but this embodiment is not limited to the above optional implementation methods. Those skilled in the art can arbitrarily combine the above methods to obtain other various implementation methods. Anyone can derive other various forms of implementation methods under the inspiration of this embodiment. The above specific implementation methods should not be understood as limiting the scope of protection of this embodiment. The scope of protection of this embodiment shall be based on the definition in the claims, and the description can be used to interpret the claims.
Claims
1. A contact insulator, characterized in that: The invention comprises a conductive rod (1), wherein an insulating layer (2) is provided on the outer jacket of the conductive rod (1), wherein the upper and lower parts of the insulating layer (2) are respectively provided with skirts (3), wherein a groove (4) is provided on the insulating layer (2) of the skirt (3) in the direction of the conductive rod (1), and a junction shield (5) is provided below the groove (4), wherein one end of the junction shield (5) is connected to the conductive rod (1).
2. The contact insulator according to claim 1, characterized in that: A nut (6) for installation is arranged in the middle of the insulating layer (2).
3. The contact insulator according to claim 1, characterized in that: A ground shield (7) is provided in the middle of the insulating layer (2).
4. A contact insulator according to claim 3, characterized in that: The height of the ground shield (7) is 60-90 mm, and the length is 1.5-3 mm.
5. The contact insulator according to claim 1, characterized in that: The length of the boundary shield (5) is 1.5-3.5 mm.
6. The contact insulator according to claim 1, characterized in that: The maximum width L of the groove (4) is 30-40 mm, and the depth H1 of the groove (4) is 20-40 mm.
7. The contact insulator according to claim 1, characterized in that: The distance H2 from the boundary shield (5) to the groove (4) on the conductive rod (1) is 10-20 mm.
8. The contact insulator according to claim 2, characterized in that: The distance L2 from the boundary shield (5) close to the nut (6) to the edge of the contact sub-insulator is 20-30 mm.
9. The contact insulator according to claim 2, characterized in that: The distance L3 from the boundary shield (5) away from the nut (6) to the edge of the contact sub-insulator is 20-30 mm.
10. The contact insulator according to claim 1, characterized in that: The boundary shield (5) is a conductor or a semiconductor.