Phase-changeable T-shaped bus structure taking clean air as insulating medium

Abstract

The invention provides a phase-changeable T-shaped bus structure taking clean air as an insulating medium, which comprises a shell, the clean air is adopted as the insulating medium in the shell, a corrugated heat dissipation structure is cast on the surface of the shell, the top, the bottom and the left part of the shell are connected with basin-type insulators through flanges, and the basin-type insulators are connected with the outer side of the shell. The basin-type insulator is connected with the support conductor and the outlet conductor through the metal insert, and the butt joint surfaces of the support conductor and the outlet conductor are connected through the butt joint assembly. The right part of the housing is provided with an electroscope / adsorbent and an explosion-proof device, and is also provided with a density relay. The method has the beneficial effects that the insulating medium adopts clean air, so that low-carbon and environment-friendly effects are realized; the phase change function adopts a modular design, so that the phase change flexibility is realized; and the conductor adopts a rounded rectangular through-flow cross section, so that edge electric field distortion is weakened and the like.

Description

Technical Field

[0001] The present invention belongs to the field of power systems, and in particular relates to a T-shaped busbar structure for power systems. Background Art

[0002] With the development of power systems towards high voltage, large capacity, and environmental protection, traditional sulfur hexafluoride (SF6) gas-insulated equipment is gradually restricted due to the greenhouse effect problem. At the same time, the following pain points exist in the existing busbar structure during phase conversion operations: Poor environmental protection of the insulating medium: The traditional SF6 has a high greenhouse effect potential value, while the clean air insulation technology is still in the exploration stage and there are few large-scale application cases.

[0003] Insufficient phase conversion flexibility: Conventional T-shaped busbars need to adjust the phase through the combination of multiple modules, which is complex to install and prone to introducing safety hazards.

[0004] Limitations in conductor design: The current-carrying efficiency of circular conductors is limited by the cross-sectional shape, resulting in low utilization rate.

[0005] Based on this, there is an urgent need for a high-voltage busbar structure that takes into account environmental protection, flexibility, and electrical performance. Summary of the Invention

[0006] In view of this, the present invention aims to propose a phase-convertible T-shaped busbar structure with clean air as the insulating medium to solve the problems of poor environmental protection of the insulating medium, insufficient phase conversion flexibility, and limitations in conductor design of the current T-shaped busbar structure.

[0007] To achieve the above object, the technical solution of the present invention is realized as follows: A phase-convertible T-shaped busbar structure with clean air as the insulating medium, including a housing. The interior of the housing is a sealed space, and the sealed space uses clean air as the insulating medium. Heat dissipation structures are die-cast on the front and rear outer surfaces of the housing. Basin insulators are installed at the outlets at the top, bottom, and left of the housing. Each basin insulator is connected to the outlet of the housing through a flange. Each basin insulator is provided with three metal inserts, and the three metal inserts are distributed in an equilateral triangle. The metal inserts of the basin insulator at the bottom of the housing are all connected to the support conductor through bolts. Each support conductor is provided with three support conductor docking surfaces. The metal inserts of the basin insulators at the top and left of the housing are all connected to the outlet conductor. The outlet conductor includes two combination types, namely outlet conductor combination one and outlet conductor combination two. The docking surface of the outlet conductor is connected to the support conductor docking surface through a docking component. A voltage detector / adsorbent and explosion-proof device is installed on the right of the housing through a flange cover. A density relay is also installed on one side of the voltage detector / adsorbent and explosion-proof device.

[0008] Further, the right part of the housing can be disassembled and replaced with a pot-type insulator, and the metal insert of the pot-type insulator on the right part of the housing is connected to the outlet conductor.

[0009] Further, the housing is made of aluminum alloy, and an anodic oxidation process is adopted inside the housing, resulting in the formation of an alumina insulating layer.

[0010] Further, the outlet conductor assembly one and the outlet conductor assembly two support overall mirroring to achieve the inversion of the triangular phase sequence, and the outlet conductor assembly two also supports the individual mirroring of two conductors to achieve phase sequence change.

[0011] Further, the outlet conductor and the support conductor are manufactured by low-pressure casting process, and the outlet conductor and the support conductor are integrally formed with the docking surface.

[0012] Further, the outlet conductor and the support conductor are manufactured by gradient density casting process.

[0013] Further, the docking surface of the support conductor and the docking surface of the outlet conductor adopt a graphene-silver composite conductive layer.

[0014] Further, the current-carrying cross-section of the outlet conductor and the support conductor is a rounded rectangular cross-section.

[0015] Further, the heat dissipation structure adopts a corrugated structure.

[0016] Further, the outlet conductor is connected to the metal insert through a guiding cone.

[0017] Compared with the prior art, the present invention provides a commutable T-shaped busbar structure with clean air as the insulating medium, which has the following beneficial effects: (1) The commutable T-shaped busbar structure with clean air as the insulating medium according to the present invention has the beneficial effects of environmental protection insulating medium and structural innovation: the clean air insulation system uses filtered and dried clean air to replace SF6, achieving zero greenhouse gas emissions. Combining with the T-shaped structure to optimize the internal electric field distribution, the risk of partial discharge is reduced by the smooth transition of the rounded rectangular conductor. An anodic oxidation process is adopted inside the housing to form a dense alumina insulating layer inside the aluminum housing, improving the insulation level.

[0018] (2) The commutable T-shaped busbar structure with clean air as the insulating medium according to the present invention has the beneficial effect of modular commutable design: a docking component with a unified size is arranged inside, which supports the replacement of the conductor combination to achieve phase adjustment.

[0019] (3) For the phase-changeable T-shaped busbar structure with clean air as the insulating medium described in the present invention, the beneficial effect of conductor cross-section optimization: The cross-section for current flow is a rounded rectangle. The main cross-section for current flow is in the shape of a rounded rectangle, reducing the edge electric field distortion by more than 20% compared with traditional rectangular conductors. By increasing the equivalent cross-sectional area (about 15%) and optimizing the skin effect, the rated current is increased to the 3150A level and is compatible with the vacuum interrupter technology.

[0020] (4) For the phase-changeable T-shaped busbar structure with clean air as the insulating medium described in the present invention, the beneficial effects of heat dissipation and mechanical strengthening: Composite heat dissipation design, combining natural air convection and the corrugated structure of the housing, reducing the temperature rise by 10 - 15°C compared with the conventional design. The structural stability is improved. High-strength aluminum alloy housing and epoxy resin insulating supports are used, and the short-circuit electrodynamic force resistance is increased by 30% compared with traditional busbars.

[0021] (5) For the phase-changeable T-shaped busbar structure with clean air as the insulating medium described in the present invention, the beneficial effect of optimizing the cast conductor structure: Integrated molding technology, using low-pressure casting process to achieve seamless integrated molding of the conductor and the docking terminal, eliminating the increase in contact resistance caused by traditional bolt connections and avoiding the risk of local overheating. The gradient density casting process design, with a high-density outer layer enhancing the mechanical strength and arc erosion resistance. The low-density inner layer optimizes the heat conduction path, and the heat dissipation efficiency is increased by about 25% compared with the traditional conductor structure.

[0022] For the phase-changeable T-shaped busbar structure with clean air as the insulating medium described in the present invention, the beneficial effect of the cast housing with a heat dissipation structure: The outer surface of the housing is die-cast with a heat dissipation corrugated structure, increasing the heat dissipation efficiency and the mechanical strength of the housing by increasing the heat dissipation area and inducing the turbulence effect, and greatly optimizing the stress distribution of the housing.

[0023] For the phase-changeable T-shaped busbar structure with clean air as the insulating medium described in the present invention, the beneficial effect of the surface treatment of the conductor and the housing: An anodizing process is used inside the housing to form a dense aluminum oxide insulating layer on the inner surface, increasing the insulation margin. The graphene-silver composite conductive layer is used on the conductor docking surface to reduce the docking resistance; the high-field strength area is precisely polished to effectively reduce the electric field strength in the voltage-sensitive area. Description of the Drawings

[0024] The drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings: Figure 1 is a cross-sectional view of the T-shaped busbar structure described in the embodiment of the present invention; Figure 2 is an overall schematic diagram of the T-shaped busbar structure described in the embodiment of the present invention; Figure 3 Side view of the T-shaped busbar structure according to an embodiment of the present invention; Figure 4 Front view of the T-shaped busbar structure according to an embodiment of the present invention; Figure 5 Schematic diagram of the support conductor according to an embodiment of the present invention; Figure 6 Overall schematic diagram of the first combination of outlet conductors according to an embodiment of the present invention; Figure 7 Side view of the first combination of outlet conductors according to an embodiment of the present invention; Figure 8 Top view of the first combination of outlet conductors according to an embodiment of the present invention; Figure 9 Overall schematic diagram of the second combination of outlet conductors according to an embodiment of the present invention; Figure 10 Side view of the second combination of outlet conductors according to an embodiment of the present invention; Figure 11 Top view of the second combination of outlet conductors according to an embodiment of the present invention.

[0025] Explanation of reference numerals: 1. Housing; 2. Pot-type insulator; 3. Outlet conductor; 4. Support conductor; 5. Guide cone; 6. Electrical detector / adsorbent and explosion-proof device; 7. Density relay; 8. Flange; 9. Heat dissipation structure; 10. Butt joint surface of support conductor; 11. First combination of outlet conductors; 12. Second combination of outlet conductors; 13. Metal insert. Detailed implementation manners

[0026] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0027] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0028] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0030] As Figures 1 to 11 shown, a commutable T-shaped busbar structure with clean air as the insulating medium includes a housing 1. The interior of the housing 1 is a sealed space, and the sealed space uses clean air as the insulating medium. Heat dissipation structures 9 are die-cast on both the front and rear outer surfaces of the housing 1. Pot-type insulators 2 are installed at the outlets at the top, bottom, and left of the housing 1. Each pot-type insulator 2 is connected to the outlet of the housing 1 through a flange 8. Each pot-type insulator 2 is provided with three metal inserts 13, and the three metal inserts 13 are distributed in an equilateral triangle. The metal inserts 13 of the pot-type insulator 2 at the bottom of the housing 1 are all connected to the support conductor 4 through bolts. Each support conductor 4 is provided with three support conductor docking surfaces 10. The metal inserts 13 of the pot-type insulators 2 at the top and left of the housing 1 are all connected to the outlet conductor 3. The outlet conductor 3 includes two combination types: outlet conductor combination one 11 and outlet conductor combination two 12. The docking surface of the outlet conductor 3 is connected to the support conductor docking surface 10 through a docking component. An electroscope / adsorbent and explosion-proof device 6 is installed on the right part of the housing 1 through a flange cover, and a density relay 7 is also installed on one side of the electroscope / adsorbent and explosion-proof device 6.

[0031] The advantages of the present invention are as follows: (1) Environmentally friendly insulating medium and structural innovation: The clean air insulation system uses filtered and dried clean air to replace SF6, achieving zero greenhouse gas emissions.

[0032] Combined with the T-shaped structure to optimize the internal electric field distribution, and reduce the risk of partial discharge through the smooth transition of the rounded rectangular conductor.

[0033] The interior of the housing adopts an anodic oxidation process to form a dense alumina insulating layer inside the aluminum housing, improving the insulation level.

[0034] (2) Modular commutable design: A docking component with a unified size is provided inside to support the replacement of conductor combinations and achieve phase adjustment.

[0035] (3)Conductor cross-section optimization: The current-carrying cross-section is a rounded rectangle. The size of the main current-carrying cross-section is a rounded rectangle, which reduces the edge electric field distortion by more than 20% compared with the traditional rectangular conductor.

[0036] By increasing the equivalent cross-sectional area (about 15%) and optimizing the skin effect, the rated current is increased to the 3150A level and is compatible with the vacuum interrupter technology.

[0037] (4)Heat dissipation and mechanical strengthening: Composite heat dissipation design, combining natural air convection and the corrugated structure of the shell, reduces the temperature rise by 10 - 15°C compared with the conventional design.

[0038] The structural stability is improved. High-strength aluminum alloy shell and epoxy resin insulating supports are adopted, and the short-circuit electrodynamic force resistance is increased by 30% compared with the traditional busbar.

[0039] (5)Optimization of the cast conductor structure: Integrated molding technology, using low-pressure casting process, realizes seamless integrated molding of the conductor and the docking terminal, eliminates the increase in contact resistance caused by traditional bolt connections, and avoids the risk of local overheating.

[0040] Gradient density casting process design: The outer high-density area enhances the mechanical strength and the ability to resist arc ablation. The inner low-density area optimizes the heat conduction path, and the heat dissipation efficiency is increased by about 25% compared with the traditional conductor structure.

[0041] (6)Cast shell with heat dissipation structure: The outer surface of the shell is die-cast with a heat dissipation corrugated structure, which increases the heat dissipation efficiency and the mechanical strength of the shell by increasing the heat dissipation area and inducing the turbulent flow effect, and greatly optimizes the stress distribution of the shell.

[0042] (7)Surface treatment of the conductor and the shell: An anodizing process is adopted inside the shell to generate a dense alumina insulating layer on the inner surface, increasing the insulation margin.

[0043] The graphene-silver composite conductive layer is used on the conductor docking surface to reduce the docking resistance; the high-field strength area is precisely polished to effectively reduce the electric field strength in the voltage-sensitive area.

[0044] In a preferred embodiment of the invention, the right part of the housing 1 can be disassembled and replaced with a pot insulator 2, and the metal insert 13 of the pot insulator 2 on the right part of the housing 1 is connected to the outlet conductor 3. The housing 1 is made of aluminum alloy, and an anodic oxidation process is adopted inside the housing 1, resulting in the formation of an alumina insulation layer. The outlet conductor assembly one 11 and the outlet conductor assembly two 12 support overall mirroring to achieve the inversion of the triangular phase sequence, and the outlet conductor assembly two 12 also supports the individual mirroring of two conductors to achieve phase sequence change. The outlet conductor 3 and the support conductor 4 are manufactured by low-pressure casting process, and the outlet conductor 3 and the support conductor 4 are integrally formed with the docking surface. The outlet conductor 3 and the support conductor 4 adopt a gradient density casting process. The docking surface 10 of the support conductor and the docking surface of the outlet conductor 3 adopt a graphene-silver composite conductive layer. The conductor current-carrying cross-section of the outlet conductor 3 and the support conductor 4 is a rounded rectangular cross-section. The heat dissipation structure 9 adopts a corrugated structure. The outlet conductor 3 is connected to the metal insert 13 through a guiding cone 5.

[0045] The working principle of the present invention: The pot insulator is a general standardized interface for the entire gas-insulated switchgear (GIS). The three metal inserts on the pot insulator are arranged in an equilateral triangle. The support conductor is installed and fixed on the metal insert of the pot insulator through bolt connection. At the same time, there are three docking surfaces above the support conductor for installing the outlet conductor or the shielding ball structure. Different combinations of outlet conductors can be installed at different positions on the support conductor to achieve a straight two-way bus structure, an L-shaped two-way bus structure, a T-shaped three-way bus structure, and an X-shaped four-way bus structure. In actual engineering design, according to user requirements, a detachable structure for components such as lightning arresters and voltage transformers is required. The two-way bus structure can be used, and an adsorbent, an explosion-proof device, and a density relay are installed on the flange cover to achieve an independent gas chamber, reducing the gas treatment time.

[0046] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A phase-changeable T-type busbar structure using clean air as the insulating medium, characterized in that: The invention comprises a shell (1), wherein the interior of the shell (1) is a sealed space, wherein clean air is used as an insulating medium in the sealed space, wherein the front and rear portions of the outer surface of the shell (1) are molded with heat dissipation structures (9), wherein the top, bottom and left outlets of the shell (1) are all installed with pot-type insulators (2), wherein each pot-type insulator (2) is connected to the outlet of the shell (1) via a flange (8), wherein each pot-type insulator (2) is installed with three metal inserts (13), wherein the three metal inserts (13) are distributed in the form of an equilateral triangle, and wherein the metal inserts (13) of the pot-type insulator (2) at the bottom of the shell (1) are all connected to the supporting conductor via bolts. (4) connection, each of the supporting conductors (4) is provided with three supporting conductor docking surfaces (10), the metal inserts (13) of the pot-type insulator (2) at the top and left of the housing (1) are connected to the outlet conductor (3), the outlet conductor (3) comprises two types of combinations, namely, an outlet conductor combination 1 (11) and an outlet conductor combination 2 (12), the docking surface of the outlet conductor (3) is connected to the supporting conductor docking surface (10) via a docking assembly, the right part of the housing (1) is provided with an electroscope / adsorbent and explosion-proof device (6) via a flange cover, and a density relay (7) is also provided on one side of the electroscope / adsorbent and explosion-proof device (6).

2. According to claim 1, a phase-changeable T-type busbar structure using clean air as the insulating medium is characterized in that: The right part of the housing (1) can be disassembled and replaced with a pot-type insulator (2), and the metal insert (13) of the pot-type insulator (2) on the right part of the housing (1) is connected to the outlet conductor (3).

3. According to claim 1, a phase-changeable T-type busbar structure using clean air as the insulating medium is characterized in that: The shell (1) is made of aluminum alloy, and the inside of the shell (1) is subjected to an anodic oxidation process, thereby forming an aluminum oxide insulation layer.

4. The phase-changeable T-type busbar structure with clean air as the insulating medium according to claim 1 is characterized in that: The outlet conductor combination 1 (11) and the outlet conductor combination 2 (12) support overall mirroring to achieve the flipping of the triangle phase sequence. The outlet conductor combination 2 (12) also supports separate mirroring of two conductors to achieve phase sequence change.

5. The phase-changeable T-type busbar structure with clean air as the insulating medium according to claim 1 is characterized in that: The outlet conductor (3) and the supporting conductor (4) are produced by a low-pressure casting process, and the outlet conductor (3) and the supporting conductor (4) are integrally formed with the butt joint surface.

6. The phase-changeable T-type busbar structure with clean air as the insulating medium according to claim 1 is characterized in that: The outlet conductor (3) and the supporting conductor (4) are cast using a gradient density casting process.

7. The phase-changeable T-type busbar structure with clean air as the insulating medium according to claim 1 is characterized in that: The supporting conductor butt joint surface (10) and the outlet conductor (3) butt joint surface adopt a graphene-silver composite conductive layer.

8. The phase-changeable T-type busbar structure with clean air as the insulating medium according to claim 1 is characterized in that: The conductor flow cross-sections of the outlet conductor (3) and the supporting conductor (4) are rounded rectangular cross-sections.

9. The phase-changeable T-type busbar structure with clean air as the insulating medium according to claim 1 is characterized in that: The heat dissipation structure (9) adopts a corrugated structure.

10. The phase-changeable T-type busbar structure with clean air as the insulating medium according to claim 1, characterized in that: The outlet conductor (3) is connected to the metal insert (13) via a guide cone (5).

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