CN104715958B - A kind of earthed switch and its disconnecting switch - Google Patents

Abstract

The invention relates to a grounding switch, which includes a moving contact assembly and a static contact assembly, wherein the static contact assembly includes a static contact and a limit piece fixed with the static contact. The movable contact assembly includes a pair of parallel conductive arms, the inner side of the conductive arms has a gap allowing the static contacts to pass through, and one end of each conductive arm is fixed with a movable contact part. During the closing process of the grounding switch, the moving contact assembly moves toward the static contact assembly, and the limiting member forms a good electrical connection between the moving contact part and the static contact. Contacting the conductive arm prevents the moving contact assembly from continuing to move. The grounding switch of the invention has reliable performance and low cost. The invention also provides an isolating switch using the grounding switch.

Description

A grounding switch and its isolating switch

technical field

The invention relates to a grounding switch, in particular to a grounding switch used for an outdoor isolating switch in a power system. Furthermore, the invention also relates to a disconnector using such a grounding switch.

Background technique

Isolating switch is an electrical device used in the power system to open and close no-load or light-load circuits, switch operation modes, and isolate maintenance equipment. When closing, it can pass normal load current for a long time and short-circuit fault current for a short time; when opening, there is an obvious disconnection point for maintenance and protection. Usually, the isolating switch also includes a grounding switch integrated with it, so as to ground the isolating switch when necessary, so as to ensure the safety of related equipment and maintenance personnel. The isolating switch is a large amount of electrical equipment in the power system, and the environment used by the isolating switch is mostly outdoors and is easily affected by outdoor weather conditions such as rain, snow, dust, etc. Therefore, the cost of the isolating switch is reduced and its reliability is improved. It is beneficial to reduce the cost of substations, power plants, etc. and improve operational safety. French patent FR0450491 discloses a grounding switch for a disconnector, wherein a line contact is used between the moving contact and the static contact.

Contents of the invention

The invention provides a grounding switch with reliable performance and low cost. The grounding switch includes a moving contact assembly and a static contact assembly, wherein the static contact assembly includes a static contact and a limit piece fixed with the static contact. The movable contact assembly includes a pair of parallel conductive arms, the inner side of the conductive arms has a gap allowing the static contacts to pass through, and one end of each conductive arm is fixed with a movable contact part. During the closing process of the grounding switch, the moving contact assembly moves toward the static contact assembly, and the limiting member forms a good electrical connection between the moving contact part and the static contact. Contacting the conductive arm prevents the moving contact assembly from continuing to move. The grounding switch of the invention not only has a simple structure, but also can maintain the pressure with the static contact through the deformation of the movable contact part.

According to an aspect of the present invention, the grounding switch further includes two insulating blocks, and the insulating blocks are respectively mounted on the outer sides of the moving contact part. The insulating block ensures that the elastic contacts will not be damaged when subjected to electric power.

According to another aspect of the present invention, the moving contact part is an elastic contact piece, and the elastic contact piece is bent toward the inner side of the conductive arm. Compared with the spring-installed moving contact parts, the elastic contact pieces can deform by themselves without using springs or other devices, which avoids the failure of the springs when they are exposed to high temperature for a long time under special circumstances.

According to still another aspect of the present invention, the moving contact part includes a contact piece and a spring connected to the outside of the contact piece.

According to yet another aspect of the present invention, the limiting member has a pair of slots respectively corresponding to the conductive arms and capable of receiving the conductive arms. When the grounding switch generates electric power, the groove of the limiter can effectively control the movement of the moving contact part within a reasonable range, so that both the moving contact part and the static contact will not be damaged.

According to still another aspect of the present invention, the fixed contact is fixed to a connecting piece, and the limiting piece is fixed to the connecting piece through a bracket. The method of fixing the connecting piece and the bracket has a lower cost.

According to yet another aspect of the present invention, the other end of the conductive arm is used to be fixed to a conductive rod, and the conductive arm is an "L"-shaped conductive aluminum plate.

The present invention also provides a disconnector, comprising a static contact support, a post insulator, a conductive rod and the above-mentioned grounding switch, wherein the static contact is fixed to the post insulator through the static contact support, the The other end of the conductive arm is fixed to the conductive rod.

According to an aspect of the present invention, the fixed contact is fixed to a connecting piece, and the limiting piece is fixed to the connecting piece through a bracket, and the connecting piece is fixed to the pillar through the support of the static contact insulator.

According to another aspect of the present invention, the static contact support includes an extension piece and a fixing block welded to the extension piece, the extension piece is fixed to the post insulator through the fixing block, and the connecting piece Secured to the extension by a fastener. The cooperation between the connecting piece and the fixing piece is beneficial to adjust the position of the static contact during installation.

In the following, preferred embodiments will be described in a clear and understandable manner with reference to the accompanying drawings, and the above-mentioned characteristics, technical features, advantages and implementation methods of the present invention will be further described.

Description of drawings

The following drawings are only intended to illustrate and explain the present invention schematically, and do not limit the scope of the present invention. in,

Figure 1 schematically shows a perspective view of the earthing switch when it is closed from an angle;

Fig. 2 schematically shows a perspective view of the grounding switch of Fig. 1 from another angle;

Figure 3 schematically shows a perspective view of the grounding switch when it is opened;

Figure 4 schematically shows the moving contact part 35;

Figure 5 schematically shows the static contact 27;

FIG. 6 schematically shows the limiting member 26 .

Explanation of main device symbols

2 Static contact assembly 24 Fixing piece

21 Fixing block 25 Bracket

22 Extension piece 26 Limiting piece

23 Connection piece 27 Static contact

1 post insulator 262 slot

3 Moving contact assembly 31, 32 Conductive arm

33, 34 Insulation block 35 Moving contact part

351 Contact 352 Gap

353 Contact fingers 354, 261, 271 Connecting holes

36 conductive rod

detailed description

In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described with reference to the accompanying drawings. In the figures, the same reference numerals represent components with the same or similar structure but the same function, and among the components with the same structure or function, only one of them is schematically depicted, or only one of them is marked. In order to make the drawing concise, the drawing only schematically shows the parts related to the present invention, and they do not represent the actual structure of the product. "Connection" or "fixation" herein means direct "connection" or "fixation", or "connection" or "fixation" via a third party.

As shown in FIGS. 1 to 3 , a grounding switch according to an embodiment of the present invention includes a moving contact assembly 3 and a static contact assembly 2 . The static contact assembly 2 includes a static contact 27 and a stopper 26 fixed to the static contact 27 . The moving contact assembly 3 includes a pair of parallel conductive arms 31, 32, wherein the conductive arms 31, 32 are "L"-shaped electric aluminum plates, but can also be components of similar materials and shapes. There is a gap inside the conductive arms 31 , 32 allowing the static contact 27 to pass through, and a movable contact part 35 is fixed at one end of each conductive arm 31 , 32 . In this application, "inside" refers to the opposite side of the conductive arm 31 and the conductive arm 32 , and "outside" refers to the opposite side of the conductive arm 31 and the conductive arm 32 . Wherein, the distance of the gap should be adapted to the thickness of the static contact 27, that is, the gap allows the static contact 27 to pass through without hindrance, and at the same time, it will not affect the good contact between the static contact 27 and the moving contact part 35. electrical contact. During the closing process of the grounding switch, the moving contact assembly 3 moves toward the static contact assembly 2, and the stopper 26 contacts the conductive arm 31, 32 to prevent the moving contact assembly 3 from continuing to move. Those skilled in the art will understand that the limiting member 26 can have different shapes, for example, as shown in FIG. Or a plate or block (not shown) without slots. When the grounding switch generates electric power, the groove of the limiter can effectively control the movement of the moving contact part within a reasonable range, so that both the moving contact part and the static contact will not be damaged. The grounding switch of the invention not only has a simple structure, but also can maintain the pressure with the static contact through the deformation of the movable contact part. According to the illustrated embodiment, the movable contact part 35 is an elastic contact piece, and the elastic contact piece is bent toward the inner side of the conductive arms 31 , 32 . Wherein, as shown in FIG. 4 , the elastic contact piece has two connecting holes 354 at the end connected to the conductive arm 32 , and has contact fingers 353 divided by several slits 352 at the end contacting with the static contact 27 . At the end of the contact finger 353 there is a contact 351 for contacting the stationary contact 27 . The contact fingers are preferably made of copper alloy, and the surface is preferably treated by graphite silver plating, which has a high self-cleaning ability and can be maintenance-free for a long time. Contacts ensure stable and reliable contact and have good decontamination capabilities. According to another embodiment not shown, the moving contact part 35 includes a contact piece and a spring connected to the outside of the contact piece, wherein the contact piece is made of T2 copper. Compared with the spring-installed moving contact parts, the elastic contact pieces can deform by themselves without using springs or other devices, which avoids the failure of the springs when they are exposed to high temperature for a long time under special circumstances.

The static contact 27 is fixed to a connecting piece 23 through the connecting hole 271 shown in FIG. 5 , and the stopper 26 is fixed to the connecting piece 23 through a bracket 25, wherein the two holes 261 on the stopper 26 are used to connect the bracket 25. Those skilled in the art will appreciate that the connector and bracket could also be made as one piece, but a separate connector and bracket would be less costly. The static contact 27 and the stopper 26 are fixed to the connector 23 by bolts or screws so that the relative positions of the static contact 27 and the stopper 26 are fixed, thereby forming a good electrical connection between the moving contact part 35 and the static contact 27. The position of the movable contact part 35 is defined during contact. Wherein, the static contact 27 is made of T2 copper, and the limiting member 26 is made of insulating material (such as epoxy laminated glass cloth). The conductive arm 31 and the conductive arm 32 are "L" shaped, one end of the conductive arm 31 and the conductive arm 32 is used to be fixed to a conductive rod 36 , and the other end is used to fix the movable contact part 35 . The grounding switch also includes two insulating blocks 33, 34, the insulating blocks 33 and 34 are installed outside the movable contact part 35 respectively, wherein the insulating blocks ensure that the elastic contacts will not be damaged when receiving electric force.

Still as shown in Figures 1 to 3, a disconnector according to an embodiment of the present invention includes a static contact support, a post insulator 1, a conductive rod 36 and the above-mentioned grounding switch, wherein the static contact 27 passes through the static contact The support is fixed to the post insulator 1 and the other end of the conductive arms 31 , 32 is fixed to the conductive rod 36 . The static contact 27 is fixed to a connecting piece 23, and the limiting piece 26 is fixed to the connecting piece 23 through a bracket 25, and the connecting piece 23 is fixed to the post insulator 1 through the static contact support. Specifically, the static contact support includes an extension piece 22 and a fixing block 21 welded to the extension piece 22, the extension piece 22 is fixed to the post insulator 1 through a fixing piece 21, and the connecting piece 23 is fixed to the extension piece 24 through a fixing piece 24. piece 22. In FIGS. 1 to 3 , two bolts connect the connecting piece 23 and the fixing piece 24 . After the bolts are tightened, the static contact assembly 2 will not rotate. By first connecting the connecting piece 23 with the fixing piece 24, after adjusting the position of the static contact 27 on the extension piece 22, and then tightening the aforementioned bolts, it is beneficial to conveniently adjust the position of the static contact during installation.

It should be understood that although this specification is described according to various implementations, not each implementation only includes an independent technical solution. This description of the specification is only for clarity, and those skilled in the art should take the specification as a whole , the technical solutions in the various embodiments can also be properly combined to form other embodiments that can be understood by those skilled in the art.

In this article, "schematic" means "serving as an example, example or illustration", and any illustration or implementation described as "schematic" should not be interpreted as a more preferred or more advantageous Technical solutions.

The above descriptions are only illustrative specific implementations of the present invention, and are not intended to limit the scope of the present invention. Any equivalent changes, modifications and combinations made by those skilled in the art without departing from the concept and principle of the present invention shall fall within the protection scope of the present invention.

Claims (9)

1. A grounding switch, comprising a moving contact assembly (3) and a static contact assembly (2), wherein said static contact assembly (2) includes a static contact (27) and a The stopper (26) that contact (27) is fixed, The moving contact assembly (3) includes a pair of parallel conductive arms (31, 32), the inner side of the conductive arms (31, 32) has a gap allowing the static contact (27) to pass through, each One end of the conductive arm (31, 32) is fixed with a moving contact part (35); During the closing process of the grounding switch, the moving contact assembly (3) moves toward the static contact assembly (2), and the limiter (26) passes through the moving contact part ( 35) When making good electrical contact with the static contact (27), contact the conductive arm (31, 32) to prevent the moving contact assembly (3) from continuing to move, wherein the limiting member (26) There is a pair of slots (262) respectively corresponding to the conductive arms (31, 32) and capable of receiving the conductive arms (31, 32). 2. The earthing switch according to claim 1, wherein the earthing switch further comprises two insulating blocks (33, 34), and the insulating blocks (33, 34) are respectively mounted on the moving contact part (35) outside. 3. The earthing switch according to claim 1 or 2, wherein the moving contact part (35) is an elastic contact piece, and the elastic contact piece is bent toward the inner side of the conductive arm (31, 32). 4. The earthing switch according to claim 1 or 2, wherein the moving contact part (35) comprises a contact piece and a spring connected to the outside of the contact piece. 5. The earthing switch according to claim 1, wherein said fixed contact (27) is fixed to a connecting piece (23), and said limiting piece (26) is fixed to said connecting piece (25) by a bracket (25) pieces (23). 6. The grounding switch according to claim 1, wherein the other end of said conductive arm (31, 32) is used to be fixed to a conductive rod (36), and said conductive arm (31, 32) is "L" Type conductive aluminum plate. 7. A disconnector comprising a static contact support, a post insulator (1), a conductive rod (36) and the grounding switch according to any one of claims 1 to 4, wherein the static contact The head (27) is fixed to the post insulator (1) through the fixed contact support, and the other end of the conductive arm (31, 32) is fixed to the conductive rod (36). 8. The isolating switch as claimed in claim 7, wherein said static contact (27) is fixed to a connecting piece (23), and said limiting piece (26) is fixed to said connecting piece by a bracket (25) A piece (23), the connecting piece (23) is fixed to the post insulator (1) through the support of the static contact. 9. The disconnector according to claim 8, wherein said static contact support comprises an extension piece (22) and a fixing block (21) welded with said extension piece (22), said extension piece (22) ) is fixed to the post insulator (1) through the fixing block (21), and the connecting piece (23) is fixed to the extension piece (22) through a fixing piece (24).