Main busbar structure for electrical connection between ring main units and ring network power supply system

Abstract

The utility model provides a main busbar structure for electrical connection between ring main units and a ring network power supply system. The main busbar structure comprises side expansion sleeves, a conductive connection portion and a main busbar, the two side expansion sleeves are used for being installed on the two sides of the ring main unit respectively, one end of each side expansion sleeve is provided with a uniform electric field cavity defined by insulating partition plates, the conductive connection portion is arranged in the uniform electric field cavity, and the main busbar is arranged in the conductive connection portion. The conductive connecting part is provided with a first connecting hole with a downward opening relative to the horizontal mounting direction of the side expansion sleeve; one end of the main busbar is inserted into the first connecting hole of the expansion sleeve on one side from the lower portion through a connecting piece to be locked, and the other end of the main busbar is inserted into the first connecting hole of the expansion sleeve on the other side from the lower portion through another connecting piece to be locked. By optimizing the structural design of the main busbar and the side expansion sleeve, the problem that the lap joint installation space of the ring main unit and the busbar is insufficient is solved, and the uniform electric field cavity is arranged at the electric connection part of the main busbar and the side expansion sleeve, so that the miniaturization of the ring main unit is realized, and meanwhile, the electric field uniformity and the interphase insulation strength are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of ring network cabinets, and mainly relates to a main busbar structure for electrical connection between ring network cabinets and a ring network power supply system. Background Art

[0002] In the power supply network system, in order to improve the reliability of power supply, the power supply network is usually connected into a ring so that users can obtain power from two directions. This power supply method is referred to as ring network power supply. Among them, multiple ring network cabinets are connected through the main busbar, which is usually locked with the bushing from the side by screws. Compared with small-sized cabinets, due to the poor insulation performance of air itself, if the side locking method is adopted, there will be a problem that the distance between the bushings is not enough to meet the insulation performance requirements. In addition, due to the limitation of the cabinet width, the space for installing the main busbar is limited, the requirements for the installer are high, and the installation is difficult. If the cabinet width is increased, the space of the ring network cabinet will increase, which is not conducive to the miniaturization design of the ring network cabinet. Utility Model Content

[0003] In order to solve the problem that the cabinet width of the air-insulated ring network cabinet used in the current related technology does not meet the insulation requirements, and the installation is complicated and difficult due to the limitation of the cabinet width, a main busbar structure and a ring network power supply system for electrical connection between ring network cabinets are provided.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] The present application discloses a main busbar structure for electrical connection between ring network cabinets, comprising:

[0006] The two-side expansion sleeves are used to be installed on the two sides of a ring network cabinet respectively, and a uniform electric field cavity is provided at one end of each of the side expansion sleeves, and the uniform electric field cavity is surrounded by an insulating partition. A conductive connecting part is provided in the uniform electric field cavity, and a first connecting hole is provided on the conductive connecting part, which opens downward relative to the horizontal installation direction of the side expansion sleeve;

[0007] The main busbar has one end inserted from below through a connecting piece and locked in the first connecting hole of one of the side expansion sleeves, and the other end inserted from below through another connecting piece and locked in the first connecting hole of the other side expansion sleeve.

[0008] Optionally, the insulating partition includes three shielding surfaces, the three shielding surfaces enclose the uniform electric field cavity, and the connection between the shielding surfaces is an arc transition.

[0009] Optionally, the side expansion sleeve includes an outer sleeve and a conductive rod partially located inside the outer sleeve, the end of the conductive rod extending out of the outer sleeve is the conductive connecting portion, the insulating partition is arranged on an end surface of the outer sleeve facing the other side expansion sleeve, and the connection between each shielding surface of the insulating partition and the end surface of the outer sleeve is an arc transition.

[0010] Optionally, the two axial ends of the outer sleeve are a first end and a second end, the first end is provided with the insulating partition, the second end is used to be installed on the ring network cabinet, the conductive rod is arranged in the outer sleeve along the axial direction of the outer sleeve, one axial end of the conductive rod extends out of the first end to be the conductive connecting part, and the other end of the conductive rod is configured as a spherical shape for connecting with the main coupler.

[0011] Optionally, the insulating partition and the end faces of the outer sleeve form four faces of a hexahedral structure, the other two faces of the hexahedral structure are in an open state, and the first connecting hole is arranged toward one of the faces in the open state.

[0012] Optionally, a convex ring is provided on the tube body surface of the outer sleeve and is raised relative to the tube body surface. There are multiple convex rings, and the multiple convex rings are spaced apart along the axial direction of the outer sleeve.

[0013] Optionally, the top outer surface of the conductive connection portion is configured as an arc surface.

[0014] Optionally, the conductive connecting part is spherical as a whole, and a cut surface is formed on the circumferential side wall of the conductive connecting part, and the cut surface is used to fit with the main busbar when the main busbar is installed, and the first connecting hole is located at the cut surface.

[0015] Optionally, the first connecting hole is configured as a blind hole so that the end of the connecting member is covered in the conductive connecting portion.

[0016] Optionally, the connecting head of the connecting piece is provided with an arc-shaped surface.

[0017] Optionally, the main busbar structure further includes a branch copper busbar, and the branch copper busbar is connected to the main busbar via a connector.

[0018] Optionally, the branch copper busbar is provided with a second connection hole opening upward relative to the horizontal installation direction of the side expansion sleeve, and one end of the branch copper busbar is inserted into the second connection hole from above through a connecting piece and locked.

[0019] Optionally, the second connecting hole is configured as a blind hole so that the end of the connecting piece is covered in the branch copper busbar.

[0020] The present application discloses a ring network power supply system, comprising multiple ring network cabinets. The ring network power supply system includes a main busbar structure for electrical connection between ring network cabinets as described in any of the above embodiments, wherein the main busbar structure is arranged in a ring network cabinet, and the other end of the expanded sleeve on one side of the main busbar structure is connected to one of the adjacent ring network cabinets, and the other end of the expanded sleeve on the other side of the main busbar structure is connected to another adjacent ring network cabinet.

[0021] Optionally, the ring main unit is further provided with a switch mechanism, and the other end of the branch copper busbar of the main busbar structure is connected to the switch mechanism, so that the switch mechanism draws power from the branch copper busbar.

[0022] Optionally, the main busbar structure includes three groups, and each group of the main busbar structure corresponds to a phase in the ring network power supply system.

[0023] The technical solution provided by the embodiments of the present disclosure may have the following beneficial effects:

[0024] The present application provides a main busbar structure for electrical connection between ring network cabinets, which includes a side expansion sleeve, a conductive connection part and a main busbar. By setting the opening of the first connection hole on the conductive connection part to face downward, the main busbar can be inserted and locked from below through a connector. In this way, when installing the main busbar on the side expansion sleeve, there is no need to consider the installation space between the expansion sleeves on both sides, which is equivalent to avoiding the limitation of the space on both sides, and realizing effective installation under the width of the small cabinet. The staff does not need to perform complex operations in a small space, but only needs to simply insert and lock the connector, which simplifies the installation process and improves the installation efficiency. At the same time, a uniform electric field cavity is set at one end of the side expansion sleeve, and the uniform electric field cavity is surrounded by an insulating partition. The insulating shielding plate isolates the overlap between the conductive rod and the main busbar from the external electrical formation area, prevents electrical leakage from the electrical connection between the conductive rod and the main busbar, and makes the electric field distribution at the overlap between the main busbar and the ring network cabinet more uniform, reduces the electric field concentration, and increases the phase-to-phase insulation strength. In general, the main busbar structure for electrical connection between ring network cabinets disclosed in the present application solves the problem of insufficient installation space in small-sized cabinets by optimizing the structural design of the main busbar and the side expansion bushing, thereby reducing the overall size of the ring network cabinet, thereby realizing the miniaturization of the cabinet, and taking into account the insulation performance of the cabinet while reducing the volume of the cabinet. By providing a uniform electric field cavity enclosed by an insulating partition at the electrical connection between the main busbar and the side expansion bushing, the electric field uniformity and the phase-to-phase insulation strength are improved, which further promotes the miniaturization design of the cabinet. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram showing the connection between the main busbar structure and the ring network cabinet of a ring network power supply system according to an exemplary embodiment;

[0026] Figure 2 is a cross-sectional view of the connection between the main busbar structure and the ring network cabinet of a ring network power supply system according to an exemplary embodiment;

[0027] Figure 3 for Figure 2 A local enlarged view of point A;

[0028] Figure 4 for Figure 2 A partial enlarged view of point B;

[0029] Figure 5 is a perspective schematic diagram of a side expansion sleeve according to an exemplary embodiment;

[0030] Figure 6 is a side schematic diagram of a side expansion sleeve according to an exemplary embodiment;

[0031] Figure 7 for Figure 6 A cross-sectional view at the section line of ;

[0032] The corresponding relationship between the reference numerals and the component names is as follows:

[0033] 1 side expansion sleeve, 101 uniform electric field cavity, 11 insulating partition, 12 outer sleeve, 13 conductive rod, 14 convex ring;

[0034] 2 conductive connection part, 201 first connection hole, 202 cut surface;

[0035] 3 main busbars;

[0036] 4. Connectors;

[0037] 5 branch copper busbar, 501 second connection hole;

[0038] 6-ring main unit. DETAILED DESCRIPTION

[0039] The utility model provides a main busbar structure and a ring network power supply system for electrical connection between ring network cabinets. In order to make the purpose, technical solution and effect of the utility model clearer and more specific, the utility model is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the protection scope of the utility model.

[0040] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are 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 therefore cannot be understood as a limitation on the present invention.

[0041] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0042] Figure 1 and Figure 2 The electrical connection structure between two ring main cabinets in the ring main power supply system is shown. Figures 1 to 7 Only the parts of the present application that are different from the prior art structures are shown.

[0043] In order to improve the reliability of power supply and enable users to obtain power from two directions, the power supply network is usually connected into a ring, that is, a ring network power supply system, and this power supply method is referred to as ring power supply. The high-voltage switchgear used in the ring network power supply system is generally called a ring network cabinet.

[0044] The ring main unit usually has multiple internal compartments, such as a circuit breaker compartment, a busbar compartment, a cable compartment, a relay instrument compartment, etc. Figure 1 and attached Figure 2 The ring main unit 6 indicated in the figure is actually a cabinet side panel of the ring main unit, and the structure of the ring main unit is simplified here.

[0045] Multiple ring main units 6 are electrically connected through a main busbar structure. Figure 1 As shown, the main busbar structure includes three groups, each group of the main busbar structure corresponds to one phase in the ring network power supply system, that is, the three-phase main busbar structure of the three-phase power supply.

[0046] Please see attached Figure 2 Taking one of the main busbar structures used for electrical connection between ring main units 6 as an example, the main busbar structure is installed in a cabinet of a ring main unit, and the main busbar structure includes a side expansion bushing 1 and a main busbar 3.

[0047] Among them, the two ends of the main busbar 3 are connected through the side expansion sleeve 1 and the mother coupler respectively, so that the two ring network cabinets adjacent to the ring network cabinet can realize bus connection. A conductive rod 13 is arranged in the side expansion sleeve 1. The end of the conductive rod 13 away from the main busbar 3 is connected to one end of the mother coupler, and the other end of the mother coupler is connected to the conductive rod of the side expansion sleeve of another ring network cabinet. In this way, the adjacent ring network cabinets can be electrically connected through the side expansion sleeves 1 and the side expansion sleeves 1.

[0048] For further information, please see the attached Figure 1 In this embodiment, the two side expansion sleeves 1 are used to be installed in the ring network cabinet 6 respectively, and are located on the opposite sides of the ring network cabinet 6. The two side expansion sleeves 1 are respectively connected to the adjacent ring network cabinets through a mother coupler.

[0049] The side expansion bushing 1 comprises an insulating partition 11, an outer sleeve 12 and a conductive rod 13. The conductive rod 13 is provided with a first connection hole 201, and the main busbar 3 is electrically connected to the conductive rod 13 through the first connection hole 201.

[0050] The main busbar 3 and the conductive rod 13 are electrically connected via the connector 4. For example, the first connecting hole 201 is a threaded hole, and the connector 4 is a bolt or a screw. After the connector 4 passes through the main busbar 3, it is locked with the conductive rod 13 through the first connecting hole 201.

[0051] The axial ends of the outer sleeve 12 are a first end and a second end. An insulating partition 11 is provided on the first end, and the second end is used to be installed on the ring network cabinet 6. For example, the second end of the outer sleeve 12 is fastened to the cabinet body of the ring network cabinet 6 by bolts, thereby ensuring a stable connection between the side expansion sleeve 1 and the ring network cabinet 6.

[0052] like Figure 6 and Figure 7 As shown, the side expansion sleeve 1 provided in this embodiment also includes a convex ring 14. The tube body surface of the outer sleeve 12 is provided with a convex ring 14 protruding relative to the tube body surface. There are multiple convex rings 14, and the multiple convex rings 14 are arranged at intervals along the axial direction of the outer sleeve 12.

[0053] In electrical equipment, the uneven distribution of the electric field may cause local discharge and electrical failure. By setting the convex ring 14 and arranging it at axial intervals along the outer sleeve 12, the electric field can be distributed more evenly on the surface of the outer sleeve 12, reducing the risk of electric field distortion and electric field concentration.

[0054] For example, the outer sleeve 12 is made of epoxy resin. The convex ring 14 is an epoxy resin cast and arranged to be convex relative to the tube body surface of the outer sleeve 12. Epoxy resin has good insulation properties. Similarly, the outer sleeve 12 can be made of other materials with good insulation properties.

[0055] In actual preparation and production, the outer sleeve 12 and the convex ring 14 can be integrally formed.

[0056] like Figure 2 and Figure 5 As shown, a uniform electric field cavity 101 is provided at one end of the side expansion bushing 1 , and the uniform electric field cavity 101 is surrounded by an insulating partition 11 , and the connection between the conductive rod 13 and the main busbar 3 is provided in the uniform electric field cavity 101 .

[0057] It can be understood that the insulating partition 11 is made of insulating material, and the insulating partition 11 encloses a uniform electric field cavity 101 that can provide electrical isolation for the electrical connection structure in the cavity, which is equivalent to the uniform electric field cavity 101 formed by the insulating partition 11, which can make the overlap of the electrical connection between the conductive rod 13 and the main busbar 3 isolated from the external electrical formation area, thereby preventing the influence of external electrical interference on the electrical connection, and preventing electrical leakage from occurring at the electrical connection between the conductive rod 13 and the main busbar 3, thereby improving the insulation strength of the main busbar structure.

[0058] For example, the insulating material used for the insulating partition 11 may be epoxy resin.

[0059] In more detail, the insulating partition 11 can be designed to be integrally cast with the outer sleeve 12 by epoxy resin. Specifically, the insulating partition 11 is arranged on one end surface of the outer sleeve 12 that faces the other side of the expanded sleeve 1. Figure 1 and attached Figure 2 As shown, the outer sleeves 12 respectively provided on the ring main units 6 at both sides are arranged opposite to each other, and one end of the outer sleeve 12 provided with the insulating partition 11 is adjacent to each other.

[0060] The insulating partition 11 includes three shielding surfaces, which enclose a uniform electric field cavity 101. The shielding surfaces provide electrical isolation for the electrical connection between the conductive rod 13 and the main busbar 3, prevent the electric field from leaking from around the electrical conductor to the external environment, reduce the electric field concentration at the electrical connection between the main busbar 3 and the expansion bushing, and improve the insulation strength.

[0061] As attached Figure 5 As shown, the insulating partition 11 is composed of two oppositely arranged partitions and a third partition connected between the two oppositely arranged partitions. The two oppositely arranged partitions are located on both sides of the overlap between the main busbar 3 and the ring network cabinet 6, further increasing the phase-to-phase insulation strength.

[0062] Furthermore, the connection between each shielding surface is an arc transition. In this way, compared with sharp corners, the arc transition between each shielding surface can reduce the sudden change of the electric field at the connection of the shielding surface, make the electric field distribution more uniform, and avoid the electric field from being too concentrated at the connection of the shielding surface of the insulating partition 11, thereby improving the electrical insulation performance of the main busbar 3 and the ring network cabinet 6 overlapped in the uniform electric field cavity 101.

[0063] The connection between each shielding surface of the insulating partition 11 and the end surface of the outer sleeve 12 is an arc transition. In this way, the shielding surfaces enclosed by the insulating partition 11 and the connection between the shielding surface and the end surface are all arc transitions, avoiding the existence of an area that easily causes electric field concentration in the uniform electric field cavity 101, and further improving the effect and effect of uniform electric field distribution in the uniform electric field cavity 101.

[0064] like Figure 2 and Figure 7 As shown, the conductive rod 13 is partially located in the outer sleeve 12. Specifically, the conductive rod 13 is arranged in the outer sleeve 12 along the axial direction of the outer sleeve 12, one axial end of the conductive rod 13 extends out of the first end to form a conductive connection portion 2, and the other axial end of the conductive rod 13 is used to cooperate with the bus coupler. In this way, the two ends of the conductive rod 13 are respectively connected to the main busbar 3 and the bus coupler, so that a ring loop can be formed between each ring network cabinet 6 through this structure.

[0065] One axial end of the conductive rod 13 is configured as a conductive connection part 2, which is arranged in the uniform electric field cavity 101, and the conductive connection part 2 is provided with a first connection hole 201 with an opening facing downward relative to the horizontal installation direction of the side expansion sleeve 1. By setting the opening of the first connection hole 201 on the conductive connection part 2 to face downward, the main busbar 3 can be inserted and locked from below through the connector 4, so that when the main busbar 3 is installed on the side expansion sleeve 1, it will not be limited by the installation space between the expansion sleeves 1 on both sides.

[0066] It is understandable that, due to the insertion and locking method from below, workers do not need to perform complicated operations in a small space, but only need to simply insert and lock the connector, which simplifies the installation process and improves installation efficiency.

[0067] Furthermore, the end faces of the insulating partition 11 and the outer sleeve 12 form four faces of a hexahedral structure, the other two faces of the hexahedral structure are in an open state, and the first connecting hole 201 is arranged toward one of the faces in the open state.

[0068] Combined with Figure 5It can be seen that the insulating partition 11 is configured as three faces on the circumference of the conductive connecting part 2, and the other face is the end face of the outer sleeve 12. One of the faces of the hexahedron structure is set to an open state and is arranged opposite to the end face of the outer sleeve 12, and the other face of the hexahedron structure is set to an open state and is arranged opposite to the side facing the first connecting hole 201.

[0069] Among them, one side of the first connection hole 201 facing the open state allows an operator to connect the main busbar 3 to the conductive rod 13 through the open state.

[0070] Specifically, the other surface of the hexahedral structure is set to be in an open state and faces downward, so that the operator can install the main busbar 3 and the conductive connection part 2 from bottom to top through the open surface.

[0071] Furthermore, the top outer surface of the conductive connecting portion 2 is configured as an arc surface.

[0072] Combined with Figure 5 and attached Figure 7 As shown, the top outer surface of the conductive connection part 2, that is, the surface of the end, is set to a circular arc surface, so that the electric field can smoothly transition on the end surface of the conductive connection part 2, thereby reducing the electric field concentration phenomenon and making the electric field distribution more uniform. In addition, the circular arc surface also has good electrical insulation performance, and since the circular arc surface has no sharp corners, it is not easy to generate charge accumulation.

[0073] As attached Figure 5 As shown, the conductive connecting part 2 is spherical as a whole, and a cut surface 202 is formed on the circumferential side wall of the conductive connecting part 2. The cut surface 202 is used to fit with the main busbar 3 when installing the main busbar 3, and the first connection hole 201 is located at the cut surface 202.

[0074] Firstly, considering that the joint between the conductive connection part 2 and the main busbar 3 is usually pointed, which easily leads to electric field concentration and discharge, the conductive connection part 2 is designed to be spherical as a whole, and the outer surface of the sphere is smoothly transitioned to reduce electric field concentration at the corners and uniformly distribute the electric field.

[0075] Secondly, the cut surface 202 arranged on the circumferential side wall of the conductive connecting part 2 can enable the cut surface 202 to fit tightly with the main busbar 3 when the main busbar 3 is installed, which not only increases the contact area and improves the efficiency of current transmission, but also reduces the risk of electrical failure caused by poor contact. Moreover, after the main busbar 3 is assembled at the cut surface 202 and locked with the conductive connecting part 2, it can avoid the structure of the main busbar 3 and the conductive connecting part 2 being too thin, and more effectively avoid the electric field concentration at the tip of the main busbar 3.

[0076] Combined with Figure 2 and Figure 3It can be understood that after the main busbar 3 and the conductive connecting part 2 are locked and assembled, the main busbar 3 is equivalent to forming a whole with the conductive connecting part 2. The conductive connecting part 2 is spherical as a whole, which can effectively avoid electric field concentration, achieve uniformity of electric field distribution, high efficiency of current transmission and stability of the structure, and provide reliable electrical performance guarantee for the electrical connection between the ring network cabinets 6.

[0077] like Figure 7 As shown, the first connection hole 201 provided on the conductive connection part 2 is configured as a blind hole so that the end of the connector 4 is covered in the conductive connection part 2 to avoid the formation of a tip electric field concentration at the other end of the connector 4 after passing through the conductive connection part 2 through the first connection hole 201.

[0078] Furthermore, in combination with the above-mentioned conductive connection part 2 provided with a cut surface 202 and a first connection hole 201, when the main busbar 3 is assembled at the cut surface 202 and locked with the conductive connection part 2, the main busbar 3 is equivalent to forming a whole with the conductive connection part 2, and the connector 4 is also covered inside the conductive connection part 2, which can achieve a more uniform electric field distribution, so that the overlap between the main busbar 3 and the conductive connection part 2 has good electrical insulation performance.

[0079] like Figure 7 As shown, the other axial end of the conductive rod 13 is configured as a sphere, and the spherical structure is used to cooperate with the mother coupler (not shown). Since the end of the conductive rod 13 connected to the mother coupler is spherical, it can achieve smooth and tight docking with the mother coupler, reducing friction and resistance during the connection process, so that the ring network power supply structure formed by connecting the ring network cabinets has reliability and electrical connection stability.

[0080] As attached Figure 3 The connector head of the connector is provided with an arc-shaped surface. Combining the installation structure of the connector 4, the main busbar 3 and the conductive connection part 2, it can be known that after the connector 4 locks the main busbar 3 on the conductive connection part 2, the connector head of the connector 4 abuts against the other end of the main busbar 3 away from the conductive connection part 2. By setting the connector head of the connector 4 as an arc-shaped surface, the arc-shaped surface is not prone to charge accumulation problems, thereby reducing electric field concentration and distortion, and reducing the risk of partial discharge.

[0081] From the perspective of the electrical connection structure between the main busbar 3 and the ring network cabinets 6 on both sides, one end of the main busbar 3 is inserted from below into the first connection hole 201 of the expansion sleeve 1 on one side through a connecting piece 4 and locked, and the other end is inserted from below into the first connection hole 201 of the expansion sleeve 1 on the other side through another connecting piece 4 and locked.

[0082] As attached Figure 2As shown, the two ends of the main busbar 3 are respectively connected to the ring network cabinets 6 on both sides through the side expansion bushings 1. There is a first connection hole 201 arranged downward on the conductive connection part 2 of the side expansion bushing 1, so that the two ends of the main busbar 3 can be installed on the side expansion bushings 1 on both sides in an upper and lower installation manner.

[0083] Generally, the smaller the volume of the ring main unit 6, the weaker the insulation performance. In particular, during the miniaturization design of the ring main unit 6 using dry air as the insulating gas, the insulation performance of the cabinet needs to be taken into consideration while reducing the cabinet volume.

[0084] On the one hand, the main busbar structure of the present application is provided with an insulating partition 11 at the electrical connection between the main busbar 3 and the conductive connection part 2. The uniform electric field cavity 101 enclosed by the insulating partition 11 surrounds the electrical connection between the main busbar 3 and the conductive connection part 2, thereby providing electrical isolation for the electrical connection structure in the cavity, which is equivalent to the insulating partition 11 forming an electrical isolation area between the uniform electric field cavity 101 and the outside.

[0085] Furthermore, in the uniform electric field cavity 101, the connection between the shielding surfaces of the insulating partition 11 is an arc transition, the top outer surface of the conductive connection part 2 is set as an arc surface, and the circumferential side wall of the conductive connection part 2 forms a cut surface 202 that can fit with the main busbar 3 when the main busbar 3 is installed, so that the conductive connection part 2 forms an overall spherical structure after being connected to the main busbar 3. The above structural improvement can make the electric field distribution at the overlap of the main busbar 3 and the conductive connection part 2 set in the uniform electric field cavity 101 more uniform, thereby increasing the insulation strength between phases, reducing the electric field concentration, and ensuring that the ring network cabinet 6 can meet the requirements of electrical insulation performance in a miniaturized design.

[0086] On the basis of meeting the electrical insulation performance requirements of the miniaturized ring network cabinet 6, by optimizing the installation structure of the side expansion bushing 1 and the main busbar 3, specifically, the main busbar 3 can be inserted and locked from the bottom through the connecting piece 4, so that when designing the ring network cabinet 6, there is no need to consider the limitation of the space on both sides, thereby further realizing the miniaturized design of the ring network cabinet 6.

[0087] It should be noted that, compared with the prior art, the main busbar structure can be applied to a 24KV ring network cabinet 6, and the air box of the ring network cabinet 6 only needs to be filled with dry air. The main busbar structure of the present application is improved through the above-mentioned structural aspects. For example, based on the fact that the tip of the electrical connection between the conductive connection part 2 and the main busbar 3 is easy to accumulate charge and concentrate the electric field, an insulating plate is added around the conductive connection part 2 to play a role in electrical isolation; the top outer surface of the conductive connection part 2 is set to an arc surface, which can evenly distribute the electric field at the electrical connection between the conductive connection part 2 and the main busbar 3, thereby effectively improving the insulation performance of the ring network cabinet 6, and the main busbar and the side expansion sleeve are connected up and down to further solve the problem of insufficient installation space under the small cabinet width, so that the overall size of the ring network cabinet 6 can be reduced, thereby realizing the miniaturization of the ring network cabinet.

[0088] like Figure 2 and Figure 4 As shown, the main busbar structure of this embodiment also includes a branch copper bar 5, which is connected to the main busbar 3 through a connector 4. The other end of the branch copper bar 5 is used to be electrically connected to a switch mechanism (not shown) of a ring network cabinet 6. In this way, the power supply system supplies power to the power supply trunk line formed by the electrical connection between the main busbar 3 and the ring network cabinet 6, and the branch copper bar 5 can draw power through the power supply trunk lines on both sides, thereby improving the reliability of power supply.

[0089] It is understandable that the switch mechanism is a key component in the ring network power supply system, which is responsible for controlling the distribution and protection of electric energy. For example, the switch mechanism can be a three-position switch. When the switch mechanism receives electric energy from the main busbar structure, it distributes it according to the preset control logic. A part of the electric energy will continue to be transmitted to other devices or loads through the branch copper busbar 5 to realize the power supply function.

[0090] Specifically, the branch copper busbar 5 is provided with a second connection hole 501 opening upward relative to the horizontal installation direction of the side expansion sleeve 1 , and one end of the branch copper busbar 5 is inserted into the second connection hole 501 from above through the connector 4 and locked.

[0091] Among them, the second connection hole 501 set on the branch copper busbar 5 opens upward, so that the connecting part 4 (such as a bolt) can be inserted from the top and lock the branch copper busbar 5 and the main busbar 3. The upper and lower connection assembly method can facilitate the installation of the operator, especially in the ring network cabinet 6 with limited space, which can simplify the installation process and improve work efficiency.

[0092] Furthermore, the connector 4 connecting the branch copper bus 5 and the main bus 3 has a connector head provided with an arc-shaped surface, so that charge accumulation is not easy to occur at the overlap between the branch copper bus 5 and the main bus 3.

[0093] like Figure 2 and Figure 4As shown, the second connection hole 501 is configured as a blind hole so that the end of the connector 4 is covered in the branch copper bus 5. In this way, the blind hole design ensures that the end of the connector 4 is completely covered in the branch copper bus 5, which not only improves the stability and reliability of current transmission, reduces the risk of electric field distortion and electric field concentration caused by the end of the connector 4 extending out of the branch copper bus 5 and forming a bare surface, but also enhances the mechanical connection strength between the connector 4 and the branch copper bus 5, and prevents the connection from loosening or falling off due to external factors.

[0094] Another aspect of the present application discloses a ring network power supply system, including multiple ring network cabinets 6, wherein a main busbar structure electrically connected to other ring network cabinets 6 is arranged in the ring network cabinet, the other end of the expanded sleeve 1 on one side of the main busbar structure is connected to one of the adjacent ring network cabinets 6, and the other end of the expanded sleeve 1 on the other side of the main busbar structure is connected to another adjacent ring network cabinet 6.

[0095] The ring network power supply system realizes the electrical connection between the ring network cabinets 6 in the ring network power supply system by adopting the above-mentioned main busbar structure, and the ring network power supply system can be equipped with more miniaturized ring network cabinets 6, which is conducive to a more compact and reasonable structure of the entire ring network power supply system.

[0096] On the other hand, the main busbar structure in the ring network power supply system has the structural characteristics of simple structure, easy installation, uniform electric field distribution and high electrical insulation performance, so that the application of the main busbar structure in the ring network power supply system can ensure stable and efficient transmission of current and reduce the risk of electrical failure.

[0097] The ring main unit also includes a switch mechanism. The other end of the branch copper busbar 5 of the main busbar structure is connected to the switch mechanism of the ring main unit 6 so that the switch mechanism draws power from the branch copper busbar 5 .

[0098] Furthermore, the main busbar structure includes three groups, and each group of the main busbar structure corresponds to one phase in the ring network power supply system. Figure 1 As shown, three sets of main busbar structures are arranged correspondingly to the three phases in the ring network power supply system.

[0099] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and the utility model concept of the utility model, and all these changes or substitutions should fall within the protection scope of the utility model.

Claims

1. A main busbar structure for electrical connection between ring network cabinets, characterized in that: include: The two-side expansion sleeves are used to be installed on the two sides of a ring network cabinet respectively, and a uniform electric field cavity is provided at one end of each of the side expansion sleeves, and the uniform electric field cavity is surrounded by an insulating partition. A conductive connecting part is provided in the uniform electric field cavity, and a first connecting hole is provided on the conductive connecting part, which opens downward relative to the horizontal installation direction of the side expansion sleeve; The main busbar has one end inserted from below through a connecting piece and locked in the first connecting hole of one of the side expansion sleeves, and the other end inserted from below through another connecting piece and locked in the first connecting hole of the other side expansion sleeve.

2. The main busbar structure for electrical connection between ring network cabinets according to claim 1 is characterized in that: The insulating partition includes three shielding surfaces, which enclose the uniform electric field cavity, and the connection between the shielding surfaces is an arc transition.

3. The main busbar structure for electrical connection between ring network cabinets according to claim 2 is characterized in that: The side expansion sleeve includes an outer sleeve and a conductive rod partially located inside the outer sleeve, the end of the conductive rod extending out of the outer sleeve is the conductive connecting portion, the insulating partition is arranged on an end surface of the outer sleeve facing the other side expansion sleeve, and the connection between each shielding surface of the insulating partition and the end surface of the outer sleeve is an arc transition.

4. The main busbar structure for electrical connection between ring network cabinets according to claim 3 is characterized in that: The axial ends of the outer sleeve are a first end and a second end, the first end is provided with the insulating partition, the second end is used to be installed on the ring network cabinet, the conductive rod is arranged in the outer sleeve along the axial direction of the outer sleeve, one axial end of the conductive rod extends out of the first end to be the conductive connecting part, and the other end of the conductive rod is configured as a spherical shape for connecting with the mother coupler.

5. The main busbar structure for electrical connection between ring network cabinets according to claim 3 is characterized in that: The insulating partition and the end faces of the outer sleeve form four faces of a hexahedral structure, the other two faces of the hexahedral structure are in an open state, and the first connecting hole is arranged toward one of the faces in the open state.

6. The main busbar structure for electrical connection between ring network cabinets according to claim 3, characterized in that: The tube body surface of the outer sleeve is provided with a convex ring which is arranged protruding relative to the tube body surface. There are multiple convex rings, and the multiple convex rings are arranged at intervals along the axial direction of the outer sleeve.

7. The main busbar structure for electrical connection between ring network cabinets according to claim 1, characterized in that: The top outer surface of the conductive connection portion is configured as an arc surface.

8. The main busbar structure for electrical connection between ring network cabinets according to claim 1, characterized in that: The conductive connection part is spherical as a whole, and a cut surface is formed on the circumferential side wall of the conductive connection part. The cut surface is used to fit with the main busbar when the main busbar is installed, and the first connection hole is located at the cut surface.

9. The main busbar structure for electrical connection between ring network cabinets according to claim 1, characterized in that: The first connection hole is configured as a blind hole so that the end of the connection member is covered in the conductive connection portion.

10. The main busbar structure for electrical connection between ring network cabinets according to claim 1, characterized in that: The connecting head of the connecting piece is provided with an arc-shaped surface.

11. The main busbar structure for electrical connection between ring network cabinets according to any one of claims 1 to 10, characterized in that: It also includes a branch copper busbar, which is connected to the main busbar through a connecting piece.

12. The main busbar structure for electrical connection between ring network cabinets according to claim 11, characterized in that: The branch copper bar is provided with a second connection hole opening upward relative to the horizontal installation direction of the side expansion sleeve, and one end of the branch copper bar is inserted into the second connection hole from above through a connecting piece and locked.

13. The main busbar structure for electrical connection between ring network cabinets according to claim 12, characterized in that: The second connecting hole is configured as a blind hole so that the end of the connecting member is covered in the branch copper busbar.

14. A ring network power supply system, comprising a plurality of ring network cabinets, characterized in that: It comprises any one of the main busbar structures for electrical connection between ring network cabinets as claimed in any one of claims 1 to 13, wherein the main busbar structure is arranged in a ring network cabinet, the other end of the expanded sleeve on one side of the main busbar structure is connected to one of the adjacent ring network cabinets, and the other end of the expanded sleeve on the other side of the main busbar structure is connected to another adjacent ring network cabinet.

15. The ring network power supply system according to claim 14, characterized in that: A switch mechanism is also provided in the ring main unit, and the other end of the branch copper busbar of the main busbar structure is connected to the switch mechanism so that the switch mechanism draws power from the branch copper busbar.

16. The ring network power supply system according to claim 14 or 15, characterized in that: The main busbar structure includes three groups, and each group of the main busbar structure corresponds to a phase in the ring network power supply system.

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