A ring main unit

Abstract

This utility model belongs to the field of ring main units, specifically relating to a ring main unit, including a first inflatable cabinet and a second inflatable cabinet. The first inflatable cabinet has three contact seat sleeves arranged at intervals, and the second inflatable cabinet has three side expansion sleeves that insert into the three contact seat sleeves. A fixing plate for fixing the three contact seat sleeves is provided on the outer wall of the first inflatable cabinet, and a positioning plate that engages with the fixing plate is provided on the second inflatable cabinet. Each contact seat sleeve includes an epoxy resin casting, a conductive rod, and a conductive plate. One end of the conductive plate is connected to the conductive rod, and the other end of the conductive plate has a contact piece extending into an insulating cover within the epoxy resin casting. The first inflatable cabinet engages with the positioning plate of the second inflatable cabinet via the fixing plate. During the assembly of the first and second inflatable cabinets, misalignment between the first and second inflatable cabinets can prevent the side expansion sleeves from breaking, thus extending the service life of the ring main unit.

Description

Technical Field

[0001] This utility model belongs to the field of ring main unit technology, and specifically relates to a ring main unit. Background Technology

[0002] Currently, a ring main unit (RNB) is an electrical device consisting of a group of power transmission and distribution equipment (high-voltage switchgear) housed in a metal or non-metal insulated cabinet or assembled into a modular ring network power supply unit. Its core components utilize load switches and fuses, offering advantages such as simple structure, small size, low price, improved power supply parameters and performance, and enhanced power supply safety. It is widely used in substations and prefabricated substations in load centers such as urban residential areas, high-rise buildings, large public buildings, and factories. It typically uses sulfur hexafluoride gas, environmentally friendly gases, or epoxy resin as the insulating medium. For the rapidly developing power industry, the development of environmentally friendly gas-insulated RNBs is an inevitable trend. Future power transmission and distribution equipment will inevitably continue to evolve around the demands for safety, reliability, miniaturization, and environmental friendliness. Because the insulating properties of existing environmentally friendly gases such as nitrogen and dry air are far lower than those of sulfur hexafluoride gas, there are very high requirements for the insulation performance of environmentally friendly gas-insulated RNBs.

[0003] When existing ring main units are installed in parallel, the first and second gas-insulated cabinets are prone to misalignment, which can easily lead to the breakage of the side expansion sleeve of the second gas-insulated cabinet, greatly affecting the service life of the ring main unit. In addition, the stationary contacts of the contact seat side expansion sleeve of the first gas-insulated cabinet are exposed outside the insulation layer, resulting in a small creepage distance between multiple contact seat side expansion sleeves, which cannot meet the insulation requirements of environmentally friendly gas-insulated ring main units. Summary of the Invention

[0004] The purpose of this utility model is to overcome the shortcomings and deficiencies of the existing technology and to provide a ring main unit.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A ring main unit includes a first inflatable cabinet and a second inflatable cabinet. Three contact seat sleeves are arranged at intervals on the first inflatable cabinet. Three side-expanding sleeves are provided on the second inflatable cabinet to be inserted into the three contact seat sleeves. A fixing plate for fixing the three contact seat sleeves is provided on the outer wall of the first inflatable cabinet. A positioning plate that engages with the fixing plate is provided on the second inflatable cabinet. Each contact seat sleeve includes an epoxy resin casting body on the first inflatable cabinet, a conductive rod disposed within the epoxy resin casting body, and a conductive plate disposed within the epoxy resin casting body. One end of the conductive plate is connected to the conductive rod, and the other end of the conductive plate has a contact piece extending within an insulating cover of the epoxy resin casting body.

[0006] In some embodiments, a fixing block is provided on the fixing plate between two adjacent contact seat sleeves, and the fixing block is provided with a cross-shaped positioning groove. The positioning plate is provided with a positioning block that cooperates with the fixing block, and the positioning block is provided with a cross-shaped positioning protrusion. The positioning protrusion is engaged in the positioning groove, and the fixing block and the positioning block are engaged.

[0007] In some embodiments, the contact piece is T-shaped, with a contact head in the middle, and buffer pads are respectively provided on both sides of the contact head on the contact piece.

[0008] In some embodiments, a wavy insulating isolation portion is provided inside the insulating cover of the epoxy resin casting body at the location below the contact piece.

[0009] In some embodiments, the epoxy resin casting body is provided with a plurality of copper inserts arranged in a ring array, and the fixing plate is provided with a plurality of screws connected to the plurality of copper inserts.

[0010] In some embodiments, the epoxy resin casting body is provided with a plug groove for inserting a side-expanding sleeve, and the conductive rod has a plug portion extending into the plug groove.

[0011] In some embodiments, the side expansion sleeve includes an epoxy resin shell disposed on the second inflatable cabinet and a conductive rod disposed inside the epoxy resin shell. One end of the conductive rod has a plug groove for plugging into the plug portion, and the other end of the conductive rod has a threaded connection hole exposed outside the epoxy resin shell.

[0012] In some embodiments, the conductive rod is provided with a plurality of limiting protrusions fitted into an epoxy resin shell.

[0013] In some embodiments, the epoxy resin shell is provided with an isolation ring separating the first inflatable cabinet and the second inflatable cabinet.

[0014] The beneficial effects of this utility model are as follows: The first gas-insulating cabinet engages with the positioning plate of the second gas-insulating cabinet via a fixing plate. During the assembly of the first and second gas-insulating cabinets, misalignment between the two cabinets can prevent breakage of the side expansion sleeve, thus extending the service life of the ring main unit. Furthermore, the three contact seat sleeves adopt an epoxy resin casting structure design, with the contact pieces housed within the insulating cover of the epoxy resin casting. This increases the insulation spacing between the three contact seat sleeves, resulting in better insulation performance and meeting the insulation requirements of environmentally friendly gas-insulated ring main units. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of this utility model.

[0016] Figure 1 This is a perspective view of an embodiment of the present utility model; Figure 2 This is a cross-sectional view of an embodiment of the present utility model; Figure 3 This is a perspective view of the first inflatable cabinet according to an embodiment of the present utility model; Figure 4 This is a perspective view of the second inflatable cabinet according to an embodiment of the present invention; Figure 5 This is a perspective view of the conductive plate according to an embodiment of the present invention; Detailed Implementation To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0017] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0018] The directional and positional terms used in this utility model, such as up, down, front, back, left, right, inside, outside, top, bottom, side, etc., are only for reference to the accompanying drawings. Therefore, the directional and positional terms used are for the purpose of explaining and understanding this utility model, and not for limiting the scope of protection of this utility model.

[0019] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments: like Figure 1-4As shown, a ring main unit includes a first inflatable cabinet 1 and a second inflatable cabinet 2. The first inflatable cabinet 1 has three contact seat sleeves 3 arranged at intervals. The second inflatable cabinet 2 has three side expansion sleeves 4 that are inserted into the three contact seat sleeves 3. The outer wall of the first inflatable cabinet 1 is provided with a fixing plate 5 for fixing the three contact seat sleeves 3. The second inflatable cabinet 2 is provided with a positioning plate 6 that engages with the fixing plate 5. Each contact seat sleeve 3 includes an epoxy resin casting body 31 disposed on the first inflatable cabinet 1, a conductive rod 32 disposed within the epoxy resin casting body 31, and a conductive plate 33 disposed within the epoxy resin casting body 31. One end of the conductive plate 33 is connected to the conductive rod 32, and the other end of the conductive plate 33 has a contact piece 331 extending within the insulating cover 311 of the epoxy resin casting body 31.

[0020] like Figure 3 and 4 As shown, a fixing block 51 is respectively provided on the fixing plate 5 between two adjacent contact seat sleeves 3. The fixing block 51 is provided with a cross-shaped positioning groove 511. The positioning plate 6 is provided with a positioning block 61 that cooperates with the fixing block 51. The positioning block 6 is provided with a cross-shaped positioning protrusion 611. The positioning protrusion 611 is engaged in the positioning groove 511, forming a snap-fit ​​engagement between the fixing block 5 and the positioning block 6. The fixing plate is engaged with the positioning block of the positioning plate by the fixing block. The fixing block and the positioning block are assembled by a snap-fit ​​engagement, which facilitates the joint assembly of the first and second inflatable cabinets, avoids misalignment between the first and second inflatable cabinets, and improves assembly efficiency.

[0021] like Figure 2 and 5As shown, the contact piece 331 is T-shaped, with a contact head 332 in the middle. Buffer pads 333 are provided on both sides of the contact head 332. The T-shaped structure of the contact piece and the buffer pads buffer the isolating blade, ensuring reliable contact between the contact piece and the isolating blade of the disconnecting switch. A wavy insulating isolation section 3111 is provided inside the insulating cover 311 of the epoxy resin casting 31, below the contact piece 331. The wavy insulating isolation section increases the creepage distance, thus improving the insulation performance of the plug socket sleeve. Multiple copper inserts 310 are arranged in a circular array on the epoxy resin casting 31, and multiple screws 34 are provided on the fixing plate 5 to connect to the copper inserts 310. The fixing plate is connected to the copper inserts of the epoxy resin casting by screws, ensuring a more secure connection between the fixing plate and the contact socket sleeve. The epoxy resin casting body 31 is provided with a insertion groove 312 for the side expansion sleeve 4 to be inserted. The conductive rod 32 has an insertion part 321 extending into the insertion groove 312. By placing the insertion part of the conductive rod inside the epoxy resin casting body, the insertion part is prevented from being exposed outside the epoxy resin casting body, which helps improve the insulation performance of the contact seat sleeve. The side expansion sleeve 4 includes an epoxy resin shell 41 disposed on the second gas-filled cabinet 2 and a conductive rod 42 disposed within the epoxy resin shell 41. One end of the conductive rod 42 has an insertion groove 421 for insertion into the insertion part 321, and the other end of the conductive rod 42 has a threaded connection hole 422 exposed outside the epoxy resin shell 41. The side expansion sleeve uses an epoxy resin shell design, which provides better insulation performance and can increase the insulation distance between the three side expansion sleeves, resulting in better inter-phase insulation performance. The conductive rod 42 is provided with multiple limiting protrusions 423 fitted into the epoxy resin shell 41. The conductive rod is fitted into the epoxy resin shell by multiple limiting protrusions, ensuring a stronger connection and better insulation performance between the conductive rod and the epoxy resin shell. An isolation protrusion 411 is provided on the epoxy resin shell 41 to separate the first gas-filled cabinet 1 and the second gas-filled cabinet 2. The isolation protrusion increases the creepage distance, which helps improve the insulation performance of the ring main unit.

[0022] The first gas-insulated cabinet engages with the positioning plate of the second gas-insulated cabinet via a fixing plate. This prevents misalignment and breakage of the side expansion sleeve during assembly of the first and second gas-insulated cabinets, thus extending the service life of the ring main unit. Furthermore, the three contact seat sleeves employ an epoxy resin casting structure design, with the contact pieces housed within the insulating cover of the epoxy resin casting. This increases the insulation spacing between the three contact seat sleeves, resulting in better insulation performance and meeting the insulation requirements of environmentally friendly gas-insulated ring main units.

[0023] The above description is only one embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model; the scope of protection of the present utility model is defined by the claims in the claims, and all equivalent changes and modifications made in accordance with the utility model are within the scope of protection of the present utility model patent.

Claims

1. A ring main unit, characterized in that: The device includes a first inflatable cabinet and a second inflatable cabinet. The first inflatable cabinet has three contact seat sleeves arranged at intervals. The second inflatable cabinet has three side-expanding sleeves that insert into the three contact seat sleeves. A fixing plate for fixing the three contact seat sleeves is provided on the outer wall of the first inflatable cabinet. A positioning plate that engages with the fixing plate is provided on the second inflatable cabinet. Each contact seat sleeve includes an epoxy resin casting body disposed on the first inflatable cabinet, a conductive rod disposed within the epoxy resin casting body, and a conductive plate disposed within the epoxy resin casting body. One end of the conductive plate is connected to the conductive rod, and the other end of the conductive plate has a contact piece extending within an insulating cover of the epoxy resin casting body.

2. The ring main unit according to claim 1, characterized in that: The fixing plate is provided with fixing blocks between two adjacent contact seat sleeves. The fixing blocks are provided with "+" shaped positioning grooves. The positioning plate is provided with positioning blocks that cooperate with the fixing blocks. The positioning blocks are provided with "+" shaped positioning protrusions. The positioning protrusions are engaged in the positioning grooves, forming a snap-fit ​​cooperation between the fixing blocks and the positioning blocks.

3. The ring main unit according to claim 1, characterized in that: The contact piece is T-shaped, with a contact head in the middle, and buffer pads are provided on both sides of the contact head.

4. The ring main unit according to claim 3, characterized in that: The epoxy resin casting body has a wavy insulating isolation section located below the contact piece inside the insulating cover.

5. The ring main unit according to claim 4, characterized in that: The epoxy resin casting body has multiple copper inserts arranged in a ring array, and the fixing plate has multiple screws connected to the multiple copper inserts.

6. The ring main unit according to claim 1, characterized in that: The epoxy resin casting body is provided with a plug groove for inserting a side-expanding sleeve, and the conductive rod has a plug portion extending into the plug groove.

7. The ring main unit according to claim 6, characterized in that: The side expansion sleeve includes an epoxy resin shell disposed on the second inflatable cabinet and a conductive rod disposed inside the epoxy resin shell. One end of the conductive rod has a plug groove for plugging into the plug part, and the other end of the conductive rod has a threaded connection hole exposed outside the epoxy resin shell.

8. The ring main unit according to claim 7, characterized in that: The conductive rod is provided with multiple limiting protrusions that are fitted into the epoxy resin shell.

9. The ring main unit according to claim 7, characterized in that: The epoxy resin shell is provided with an isolation ring separating the first inflatable cabinet and the second inflatable cabinet.

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