Isolation contact device for dry air insulation GIS

Abstract

The embodiment of the utility model discloses an isolation contact device for a dry air insulation GIS, which comprises a contact seat, a moving contact, a static contact seat and a driving mechanism, the moving contact is arranged in the static contact seat, the driving mechanism drives the moving contact to be contacted with or separated from the contact seat, the contact seat comprises a contact seat body, the contact seat body is provided with a contact hole, and the contact hole is communicated with the static contact seat. The contact seat body is provided with a copper contact ring corresponding to the inlet of the contact hole, and the end part of the moving contact is provided with a copper contact part corresponding to the contact hole. According to the utility model, the arc ignition resistance is improved when the contact is opened and closed, the ignition time is shortened, the stroke is shortened, and the insulation resistance and arc ignition resistance of the product are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electricity, in particular to an isolating contact device for dry-air-insulated GIS. Background Art

[0002] China's "dual carbon" strategy has posed new challenges to the development of the power system, especially the environmental protection replacement of SF6 (sulfur hexafluoride) power equipment. The State Grid Corporation of China has proposed in the "Catalogue of New Technologies Key to Be Promoted by the State Grid Corporation of China (2017 Edition)" that the application volume of environmentally friendly gas-insulated metal-enclosed switchgear should not be less than 90% of the total new volume. In core areas of large and medium-sized cities with heavy loads and areas with harsh equipment operation environments, the application ratio can be appropriately increased. Recently, the European Council and the European Parliament have also reached an agreement - "banning the use of fluorine-containing gases in newly built and expanded electrical switchgear from entering service", and relevant high-voltage products will be implemented starting from January 2028, and there is a possibility of an earlier implementation. Nowadays, the technical research and product development of high-voltage environmentally friendly GIS (Gas Insulated Switchgear) have become a major "hotspot" and "difficult point" in the global switch industry.

[0003] When the switchgear uses dry air as the external insulation, in terms of insulation level, the insulation level of air under the same pressure is less than one-third of that of the existing SF6, and the arc extinguishing ability is also only one-third of it. In this case, to ensure the insulation performance, the distance between the conductor and the ground or between conductors will be increased, and furthermore, its pressure will be increased. However, with the increase in distance, the stroke is longer, the moving contact becomes longer and heavier. When doing work with a certain long stroke, the movement speed will decrease due to the large mass. And the arc extinguishing ability is poor under air insulation, which will increase the arcing time when the contacts are separated. Long-term arcing will cause serious damage to the contacts, and even long-term arcing cannot accurately complete opening and closing, resulting in operation failure and triggering equipment accidents. Summary of the Utility Model

[0004] The technical problem to be solved by the embodiment of the utility model is to provide an isolating contact device for dry-air-insulated GIS, so as to improve the arc burning resistance performance and shorten the burning time when the contacts are opened and closed.

[0005] To solve the above technical problem, the embodiment of the utility model provides an isolating contact device for dry-air-insulated GIS, including a contact seat, a moving contact, a static contact seat, and a driving mechanism. The moving contact is arranged in the static contact seat, and the driving mechanism drives the moving contact to contact or separate from the contact seat. The contact seat includes a contact seat body, a contact hole is provided on the contact seat body, a copper tungsten contact ring is provided on the contact seat body corresponding to the entrance of the contact hole, and a copper tungsten contact head corresponding to the contact hole is provided at the end of the moving contact.

[0006] Further, an arcing contact is provided in the contact hole, and a hole corresponding to the arcing contact is formed in the middle of the copper-tungsten contact head part.

[0007] Further, the middle edge of the copper-tungsten contact ring is an inwardly curved surface.

[0008] Further, the front end face of the arcing contact is correspondingly located at the middle of the curved surface.

[0009] Further, when the moving contact is in three positions of approaching the contact seat, contacting instantaneously, and being in full contact, the closest distance between the moving contact and the copper-tungsten contact ring is greater than the closest distance between the copper-tungsten contact head part and the arcing contact.

[0010] Further, guide rings for ensuring the coaxiality of the moving contact are provided both in the static contact seat and in the contact hole of the contact seat.

[0011] Further, spring fingers are correspondingly provided in the contact hole.

[0012] Further, the driving mechanism is a gear driving mechanism, including a rack provided at the bottom of the moving contact and a gear transmission pair meshing with the rack.

[0013] Further, there are 2 groups of contact seats, and the 2 groups of contact seats are respectively provided at both ends of the static contact seat.

[0014] Further, the inside of the moving contact is hollow.

[0015] The beneficial effects of the present utility model are as follows: The present utility model improves the arc erosion resistance performance during the opening and closing of the contacts, shortens the erosion time, shortens the stroke, and improves the insulation resistance and arc erosion resistance of the product. Description of the Drawings

[0016] Figure 1 is a three-dimensional structure diagram of the isolating contact device for dry air insulated GIS according to an embodiment of the present utility model.

[0017] Figure 2 is a front view schematic diagram of the isolating contact device for dry air insulated GIS according to an embodiment of the present utility model.

[0018] Figure 3 is a schematic diagram of the gap between the contact seat and the moving contact according to an embodiment of the present utility model.

[0019] Figure 4 is an exploded view of the contact seat according to an embodiment of the present utility model.

[0020] Figure 5 is an exploded view of the moving contact according to an embodiment of the present utility model.

[0021] Figure 6 is a three-dimensional structure diagram of the static contact seat according to an embodiment of the present utility model.

[0022] Figure 7 This is a three-dimensional structure diagram of the moving contact in the embodiment of the present utility model.

[0023] Explanation of the reference numerals in the drawings

[0024] Contact seat 10, contact hole 11, copper-tungsten contact ring 12, guide ring 13, arcing contact 14, spring finger 15, moving contact 20, copper-tungsten contact head 21, static contact seat 30, driving mechanism 40, rack 41, gear transmission pair 42. Specific embodiments

[0025] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present utility model will be further described in detail below with reference to the drawings and specific embodiments.

[0026] In the embodiments of the present utility model, if there are directional indications (such as up, down, left, right, front, back...), they are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0027] In addition, in the present utility model, the descriptions involving "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature.

[0028] Please refer to Figures 1 to 7 , the isolating contact device for dry-air-insulated GIS in the embodiment of the present utility model includes a contact seat, a moving contact, a static contact seat, and a driving mechanism.

[0029] The moving contact is arranged in the static contact seat. The driving mechanism drives the moving contact to move left and right, so that the moving contact contacts or separates from the contact seat. The main function of the present utility model is: when there is a load, the driving mechanism drives the moving contact to move left and right to realize the opening and closing functions, complete the disconnection and connection of the load, and complete the function operation.

[0030] The contact seat includes a contact seat body. A contact hole is provided on the contact seat body, and a copper-tungsten contact ring is provided corresponding to the entrance of the contact hole on the contact seat body. Spring fingers are correspondingly provided in the contact hole. Preferably, the end face of the copper-tungsten contact ring is lower than the end face of the contact seat body, that is, the end of the contact seat body protrudes beyond the copper-tungsten contact ring.

[0031] The end of the moving contact is provided with a copper-black contact part corresponding to the contact hole. Preferably, the copper-black contact part is T-shaped. After installation, the copper-black contact part will be lower than the moving contact, that is, the end face of the copper-black contact part is lower than the end face of the moving contact. The utility model designs a bolt connection hole at the end of the moving contact, and the copper-black contact part is movably connected to the moving contact by bolts. The copper-black contact part is designed to be concave. When the bolt is installed, the bolt head can be hidden inside the copper-black contact part. After installation, the copper-black contact part will be lower than the moving contact, so that the moving contact forms a mutual shielding effect with the copper-black contact part, and the copper-black contact part forms a mutual shielding effect with the bolt, thereby improving product insulation and reducing the electric field value.

[0032] The movable and detachable copper-black contact part design of the utility model is different from the conventional integrated design. After the copper-black contact part is burned and damaged, it can be replaced in time, avoiding the replacement of the entire moving contact, improving efficiency and convenience, and reducing costs.

[0033] As an implementation method, an arc-striking contact is provided in the contact hole, and a hole corresponding to the arc-striking contact is opened in the middle of the copper-black contact part.

[0034] As an implementation method, the middle edge of the copper black contact ring is an inward arc surface, preferably a 30-degree arc surface. The contact seat body and the copper black contact ring at the entrance are welded, and the entrance is designed to be an inward arc angle, maintaining an internal 30-degree angle with the vertical plane, so that the protrusion of the contact seat body forms a self-shielding cover for the copper black contact ring at the entrance edge. Such an inward bending shielding design can shorten the distance between the contact seat and the static contact seat, and reduce the field strength at the same distance. At the same time, the copper black contact ring design at the entrance can improve the resistance to arc erosion, and the arc will inevitably damage the contact seat during opening and closing, causing accidents.

[0035] As an implementation method, the front end surface of the arc-striking contact is located in the middle of the arc surface to ensure that the contact is before closing and after opening.

[0036] As an implementation method, when the moving contact is close to the contact seat, at the moment of contact and in full contact, the shortest distance between the moving contact and the copper contact ring (i.e. Figure 3 The gap 1) is larger than the shortest distance between the copper-black contact head and the arc-striking contact (i.e. Figure 3 In this way, when the contacts are opened and closed, the arc erosion can be drawn to the two copper-black contacts (i.e., copper-black contact ring and copper-black contact part) of the movable assembly as much as possible, thereby improving the opening and closing success ability.

[0037] As an implementation method, guide rings for ensuring the coaxiality of the moving contact are provided in the static contact seat and the contact hole of the contact seat. Preferably, two guide rings are provided in the contact seat. When the moving contact is inserted, the coaxiality of the moving contact and the contact seat can be ensured, and the uniform contact with the spring contact finger can be ensured. The front and rear guide ring design can also improve the product's dynamic thermal stability. When the moving contact bounces, the guide ring can play a good clamping role.

[0038] The static contact base adopts a structure with large ends and a large middle part, forming a natural shielding function. A plurality of guiding rings are installed in the static contact base, preferably distributed at both ends and the middle of the static contact base. The guiding rings are made of polytetrafluoroethylene. When the moving contact moves, it can always keep in contact with the guiding rings, ensuring the coaxiality of the moving contact, avoiding poor contact between the moving contact and the spring finger, and preventing accidents.

[0039] As an implementation manner, the driving mechanism is a gear driving mechanism, including a rack disposed at the bottom of the moving contact and a gear transmission pair meshing with the rack.

[0040] As an implementation manner, there are two groups of contact bases, and the two groups of contact bases are respectively disposed at both ends of the static contact base.

[0041] As an implementation manner, the inside of the moving contact is hollow. The moving contact of the present utility model adopts an internal hollow design, reducing the mass of the moving contact. Under the condition of a certain mechanism power, the speed of the moving contact is increased. The increase in speed will reduce the ablation of the moving contact and the contact base by the arc during the opening and closing of the moving contact, and improve the success rate of opening and closing.

[0042] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalent scope.

Claims

1. An isolating contact device for dry air-insulated GIS, characterized in that, It includes a contact base, a moving contact, a static contact base, and a driving mechanism. The moving contact is arranged in the static contact base, and the driving mechanism drives the moving contact to contact or separate from the contact base. The contact base includes a contact base body, on which a contact hole is provided. A copper tungsten contact ring is provided on the contact base body corresponding to the entrance of the contact hole, and a copper tungsten contact head corresponding to the contact hole is provided at the end of the moving contact.

2. The isolating contact device for dry air-insulated GIS according to claim 1, wherein, An arc ignition contact is provided in the contact hole, and a hole corresponding to the arc ignition contact is correspondingly opened in the middle of the copper tungsten contact head.

3. The isolating contact device for dry air-insulated GIS according to claim 2, characterized in that, The middle edge of the copper tungsten contact ring is an inward arc surface.

4. The isolating contact device for dry air-insulated GIS according to claim 3, characterized in that, The front end face of the arc ignition contact is correspondingly located at the middle of the arc surface.

5. The isolating contact device for dry air-insulated GIS according to claim 3, characterized in that, When the moving contact is in three positions of approaching the contact base, contacting instantaneously, and being fully contacted, the closest distance between the moving contact and the copper tungsten contact ring is greater than the closest distance between the copper tungsten contact head and the arc ignition contact.

6. The isolating contact device for dry air-insulated GIS according to claim 1, characterized in that, Guide rings for ensuring the coaxiality of the moving contact are provided both in the static contact base and in the contact hole of the contact base.

7. The isolating contact device for dry air-insulated GIS according to claim 1, characterized in that, Spring fingers are correspondingly provided in the contact hole.

8. The isolating contact device for dry air-insulated GIS according to claim 1, characterized in that, The driving mechanism is a gear driving mechanism, including a rack provided at the bottom of the moving contact and a gear transmission pair meshing with the rack.

9. The isolating contact device for dry air-insulated GIS according to claim 1, wherein There are 2 groups of contact bases, and the 2 groups of contact bases are respectively provided at both ends of the static contact base.

10. The isolating contact device for dry air-insulated GIS according to claim 1, characterized in that, The inside of the moving contact is hollow.

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