External cone insulator
By designing outer cone insulating parts and using the junction shielding and groove structure, the problem that existing insulating parts cannot be effectively insulated in dry air is solved, and efficient insulation performance and reliability are achieved. It is suitable for 40.5kV switch cabinets.
Patent Information
- Application Number
- CN202421343017.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-13
- Publication Date
- 2025-03-25
- Estimated Expiration
- 2034-06-13
AI Technical Summary
Existing insulating parts cannot be effectively insulated in dry air, which can easily lead to flashover and creepage, and the insulation performance and arc extinguishing performance are only 1/3 of that of SF6 gas.
An outer cone insulating member is designed, including a conductive rod, an insulating layer, a skirt, a groove and an junction shield. By setting up an junction shield and a groove, the defects in the three junction areas of the insulating member are shielded from charge accumulation and discharge flashover.
The rated insulation level of 40.5kV switch cabinet is achieved in dry air, reducing discharge risk, improving insulation performance and reliability, lower cost and easier manufacturing.
Smart Images
Figure CN222673729U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of power systems, in particular to an outer cone insulating part. 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 an outer cone insulating member to solve the technical problem that the insulating members used under the existing insulating conditions cannot be applied to the dry air cabinet.
[0005] The utility model discloses an outer cone insulating part, comprising a conductive rod, wherein the conductive rod is partially located inside a cabinet and partially located outside the cabinet, an outer jacket of the conductive rod located inside the cabinet is provided with an insulating layer, the insulating layer is provided with a skirt, a groove is provided on the insulating layer of the skirt facing the conductive rod, a junction shield is provided below the groove, and the junction shield is in a circular ring shape.
[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, the maximum width L of the groove is 30-40 mm, and the depth H1 of the groove is 40-50 mm.
[0012] 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.
[0013] Furthermore, a distance H2 from the junction shield on the conductive rod to the groove is 10-20 mm.
[0014] Furthermore, a horizontal distance L2 from the boundary shield to the edge of the insulating layer is 20-30 mm.
[0015] Furthermore, the distance between the skirt and the cabinet body is greater than 160 mm.
[0016] By setting the distance from the skirt to the cabinet, the air clearance is increased and the risk of discharge is reduced.
[0017] Furthermore, a ground shield is provided in the middle of the insulating member.
[0018] By setting a grounding shield, the entire matching part can be grounded; the power testing function can also be realized by connecting an external power testing device.
[0019] Furthermore, a nut for fixing is arranged in the middle of the insulating member.
[0020] Furthermore, the outer cone insulating member located in the cabinet is connected to a conductive bar or rod.
[0021] By connecting the outer cone insulating part in the cabinet to the conductive bar or rod, the connection between the accessories outside the cabinet and the mechanism inside the cabinet is achieved.
[0022] Furthermore, the outer cone insulating member outside the cabinet is connected with a rubber head.
[0023] The outer cone insulation outside the cabinet is connected to the rubber head, and then used in conjunction with cables or top connecting busbars to achieve the introduction of electricity or the connection between different switch cabinets.
[0024] Furthermore, a shielding cover is provided at the connection between the outer cone insulating member and the conductive bar or rod.
[0025] By setting up a shielding cover, flashover caused by tips, burrs, steps, etc. caused by process problems can be shielded.
[0026] Furthermore, the shielding cover includes a semiconductive layer and an insulating cover layer.
[0027] Furthermore, the distance from the end of the semiconductive layer to the covering connection position is not less than 5 mm.
[0028] Compared with the prior art, the utility model has the following beneficial effects:
[0029] 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 to 0.04MPa; compared with the current more common technical route of high-pressure environment, the cost is lower and the manufacturing is easier;
[0030] 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;
[0031] 3. The multi-shielded solid insulation structure unique to this series of insulation components has higher reliability and better electrical performance;
[0032] 4. By setting the groove size, it is possible to avoid air breakdown and flashover discharge caused by too short a distance under the rated voltage of lightning impulse;
[0033] 5. By setting up high-voltage shielding, the tips generated by the mating parts can be shielded, and the high field strength can be evenly dispersed into the insulating material, reducing the field strength on the mating surface and along the surface, achieving solid insulation and higher reliability;
[0034] 6. By setting up a grounding shield, the entire matching part can be grounded; the power testing function can also be realized by connecting an external power testing device;
[0035] 7. The electric field can be better uniformed by setting the ground shield to a circular shape. BRIEF DESCRIPTION OF THE DRAWINGS
[0036] 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.
[0037] Figure 1 This is a schematic diagram of the structure of the outer cone insulating member of the utility model.
[0038] Figure 2 This is a schematic diagram of the structure of the outer cone insulation of the utility model after the shielding cover is installed.
[0039] 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-cabinet, 7-ground shield, 8-nut, 9-shielding cover, 10-semi-conductive layer, 11-insulating cover layer, 12-covering connection position. DETAILED DESCRIPTION
[0040] 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.
[0041] Example 1
[0042] An outer cone insulating member, such as Figure 1-Figure 2 As shown, it includes a conductive rod 1, wherein the conductive rod 1 is partially located inside the cabinet 6 and partially located outside the cabinet 6, the conductive rod 1 is covered with an insulating layer 2, the insulating layer 2 located inside the cabinet 6 is provided with a skirt 3, the skirt 3 is provided with a groove 4 on the insulating layer 2 facing the conductive rod 1, a junction shield 5 is provided below the groove 4, and the junction shield 5 is in a circular ring shape.
[0043] 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 in the three junction areas of the insulating component caused by the manufacturing process can be shielded.
[0044] Example 2
[0045] 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.
[0046] Example 3
[0047] In this embodiment, as a preferred embodiment of the present utility model, Figure 1-Figure 2 As shown, the only changes based on Example 2 are that the maximum width L of the groove 4 is 30-40 mm, and the depth H1 of the groove 4 is 40-50 mm.
[0048] 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.
[0049] Example 4
[0050] In this embodiment, as a preferred embodiment of the present utility model, Figure 1-Figure 2 As shown, the only change based on Example 3 is that the distance H2 from the junction shield 5 on the conductive rod 1 to the groove 4 is 10-20 mm.
[0051] Example 5
[0052] In this embodiment, as a preferred embodiment of the present utility model, Figure 1-Figure 2 As shown, the only improvement based on Example 4 is that the horizontal distance L2 from the boundary shield 5 to the edge of the insulating layer 2 is 20-30 mm.
[0053] Example 6
[0054] In this embodiment, as a preferred embodiment of the present utility model, Figure 1-Figure 2 As shown, the only improvement on the basis of Example 5 is that the distance from the skirt 3 to the cabinet 6 is greater than 160 mm.
[0055] By setting the distance between the skirt 3 and the cabinet 6, the air clearance is increased, thereby reducing the risk of discharge.
[0056] Example 7
[0057] In this embodiment, as a preferred embodiment of the present utility model, Figure 1-Figure 2 As shown, the only improvement on the basis of Embodiment 6 is that a ground shield 7 is provided in the middle of the insulating member.
[0058] By providing the grounding shield 7, the entire fitting can be grounded; and the power testing function can also be realized by connecting an external power testing and power taking device.
[0059] Example 8
[0060] In this embodiment, as a preferred embodiment of the present utility model, Figure 1-Figure 2 As shown, the only improvement based on Example 7 is that the distance L3 from the bottom of the groove 4 to the conductive rod 1 is 20-30 mm.
[0061] Example 9
[0062] In this embodiment, as a preferred embodiment of the present utility model, Figure 1-Figure 2 As shown, the only improvement based on Example 8 is that a nut 8 for fixing is provided in the middle of the insulating member.
[0063] Example 10
[0064] In this embodiment, as a preferred embodiment of the present utility model, Figure 1-Figure 2 As shown, the only improvement based on Example 9 is that the insulating part located inside the cabinet 6 is connected to a copper busbar, and the insulating part located outside the cabinet 6 is connected to a rubber shield.
[0065] By connecting the insulating parts in the cabinet 6 to the copper busbar.
[0066] By connecting the insulating parts outside the cabinet 6 to the rubber shield.
[0067] Embodiment 11
[0068] In this embodiment, as a preferred embodiment of the present utility model, Figure 1-Figure 2 As shown, the only improvement based on Example 10 is that the outer cone insulating member located in the cabinet 6 is connected to a conductive bar or rod, and the outer cone insulating member located outside the cabinet 6 is connected to a rubber head, and a shielding cover 9 is provided at the connection between the outer cone insulating member and the conductive bar or rod, and the shielding cover 9 includes a semi-conductive layer 10 and an insulating cover layer 11, and the distance from the end of the semi-conductive layer 10 to the covering connection position 12 is not less than 5 mm.
[0069] By connecting the outer cone insulating member in the cabinet body 6 to the conductive bar or rod, the connection between the accessories outside the cabinet and the mechanism inside the cabinet is achieved.
[0070] The outer cone insulating piece outside the cabinet 6 is connected to a rubber head, and then matched with a cable or a top connecting busbar, so as to realize the introduction of electricity or the connection between different switch cabinets.
[0071] By providing the shielding cover 9, flashover caused by sharp points, burrs, steps, etc. caused by process problems can be shielded.
[0072] 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. An outer cone insulating member, characterized in that: The invention comprises a conductive rod (1), wherein the conductive rod (1) is partially located inside a cabinet (6) and partially located outside the cabinet (6), an outer jacket of the conductive rod (1) is provided with an insulating layer (2), the insulating layer (2) located inside the cabinet (6) is provided with a skirt (3), 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).
2. The outer cone insulating member according to claim 1, characterized in that: The maximum width L of the groove (4) is 30 to 40 mm, and the depth H1 of the groove (4) is 40 to 50 mm.
3. The outer cone insulating member 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.
4. The outer cone insulating member according to claim 3, characterized in that: The horizontal distance L2 from the boundary shield (5) to the edge of the insulating layer (2) is 20-30 mm.
5. The outer cone insulating member according to claim 1, characterized in that: The distance between the skirt (3) and the cabinet body (6) is greater than 160 mm.
6. The outer cone insulating member according to claim 1, characterized in that: A grounding shield (7) is arranged in the middle of the insulating member.
7. The outer cone insulating member according to claim 1, characterized in that: A nut (8) for fixing is arranged in the middle of the insulating member.
8. The outer cone insulating member according to claim 1, characterized in that: The insulating member located in the cabinet (6) is connected with a copper busbar.
9. The outer cone insulating member according to claim 8, characterized in that: A shielding cover (9) is provided at the connection between the insulating member and the copper busbar.
10. The outer cone insulating member according to claim 9, characterized in that: The shielding cover comprises a semi-conductive layer (10) and an insulating cover layer (11).