CN104715947A - Arc-extinguishing structure of medium-voltage switch - Google Patents

Abstract

The invention discloses an arc-extinguishing structure of a medium-voltage switch. The arc-extinguishing structure comprises an insulation sheet capable of synchronously moving with a moving contact, wherein the insulation sheet is located between the moving contact and a static contact in an opening state so as to isolate an electric arc, and a linkage mechanism is arranged between the insulation sheet and an operation mechanism of the moving contact; after adopting the scheme, the medium-voltage switch does not need a vacuum arc-extinguishing chamber and SF6 gas also does not need to be charged, so that the cost is low and the arc-extinguishing speed is high.

Description

A medium voltage switch arc extinguishing structure

technical field

The invention relates to the field of medium-voltage electrics, especially the technical field of arc extinguishing by inserting an insulating plate between moving and static contacts under pure air at a voltage level of 10kV.

Background technique

With the progress of urban construction, high-rise buildings abound, and the power substation and distribution are located downstairs. According to fire protection requirements, the substation and distribution substation requires no oil. According to the reasonable use of the construction area, the substation and distribution equipment should be "small" change". Conventional switching appliances will generate high-voltage arcs when they are opened. Arcs are free gases with high temperature and high conductivity. Explosion accidents occur in electrical equipment, so arc extinguishing is still very important.

There are several ways to extinguish the arc of the switching device, which are mainly related to the surrounding medium. In the air, the arc is extinguished by elongating the arc. In a vacuum, in SF6, the invented arc extinguishing method is almost independent of the medium. , The arc can be extinguished in the SF6 medium, and the arc can also be extinguished in the air. However, no matter which arc extinguishing scheme has great limitations and restrictions, it can only be applied to certain specific schemes. For example, air blowing, magnetic blowing, and arc extinguishing grids can be used in SF6. The greenhouse effect and the sealing requirements of switchgear should not be popularized in large quantities; the air simply depends on elongating the arc, and in a high-voltage environment, the product is too large in size and has no economic value; vacuum arc extinguishing, the production process is complicated, and the product itself is The sealing requirements are high, and at the same time, because the breaking performance of vacuum arc extinguishing is too high, it is easy to generate overvoltage in the system, causing shock and vibration to the system.

Contents of the invention

The purpose of the present invention is to provide a structure with low requirements on medium, simple structure and reliable arc extinguishing.

In order to achieve the above object, the present invention provides an arc extinguishing structure for a medium voltage switch. The switch is provided with a moving contact and a static contact that forms an opening and closing connection with the moving contact. An insulating sheet, which can be stretched and placed between the moving contact and the static contact when the switch is in the opening state, and a linkage mechanism is provided between the insulating sheet and the operating mechanism of the moving contact.

The insulating sheet is an insulating sliding sheet with sliding sleeves on both sides, the two guide rails are stretched on the side walls of the load switch, and the sliding sleeves of the insulating sliding sheet are sleeved on the guide rails.

Springs are hung on both sides of the insulating slide, and the other end of the spring is hung on the side wall of the load switch along the guide rail.

An insulating partition is arranged parallel to the static contact in the load switch, and the front end of the insulating slide can move to the insulating partition in the state of opening.

The end of the insulating partition is provided with a protruding edge toward the side of the insulating sliding piece, and the protruding edge is arranged above the front end of the insulating sliding piece in an open state.

After the above scheme is adopted, the insulating sheet is moved away under the action of the linkage mechanism when the load switch is closed, and the insulating sheet is released when the switch is opened, and quickly moves between the moving contact and the static contact under the action of the spring. The generated arc is equivalent to being stretched and extinguished under the action of the insulating sheet.

Description of drawings

Fig. 1 is a sectional view of the closing state of the load switch of the present invention;

Fig. 2 is a cross-sectional view of the load switch of the present invention in the opening state;

Fig. 3 is a schematic structural diagram of an insulating slide of the present invention;

Fig. 4 is a top view of the insulating slide of the present invention in the closing state;

Fig. 5 is a top view of the insulating slide of the present invention in the opening state.

Label description:

1. Medium voltage switch; 2. Upper static contact; 3. Moving contact; 4. Lower static contact; , sliding sleeve; 72, the front end of the insulating slide; 8, the guide rail; 9, the spring.

Detailed ways

In order to describe the technical content, structural features, achieved goals and effects of the present invention in detail, the following will be described in detail in conjunction with the embodiments and accompanying drawings.

Please refer to Fig. 1 and Fig. 2, a medium voltage switch arc extinguishing structure of the present invention, in which the upper static contact 2, the moving contact 3 and the lower static contact 4 are arranged in the switch 1, the upper static contact 2 and the lower static contact The arc extinguishing grid 5 is arranged beside the contact 4 . The moving contact 3 turns on or off to connect with the upper static contact 2 and the lower static contact 4 to realize closing and opening. There are two sets of guide rails 8 on the two side walls of the load switch 1, as shown in Figure 4 and 5, the insulating slide 7 is movably sleeved on the guide rail 8 through the sliding sleeve 71, as shown in Figure 3, the insulating slide 7 is Ears are provided on the side and the rear, and sliding sleeves 71 are located on both sides. As shown in Figures 4 and 5, a spring 9 is hung on both sides of the insulating slide 7, and the other end of the spring 9 is hung on the side wall of the load switch 1 along the guide rail 8. In the load switch 1, an insulating partition 6 is arranged parallel to the static contact. The front end 72 of the insulating slide can move to the insulating partition 6 in the state of opening. Edge 61 , the protruding edge 61 is set above the front end of the insulating slide in the open state.

When in use, as shown in Figures 1 and 4, when closing, the moving contact 3 is driven by the operating mechanism to rotate and connect the upper and lower static contacts, and the linkage mechanism connected to the operating mechanism (it can be a gear or other transmission mode, the The linkage scheme is a well-known technology in the art, and will not be repeated here) to drive the insulating slide 7 to move to the end away from the static contact, and the spring 9 is stretched. As shown in Figures 2 and 5, when the brake is opened, the moving contact 3 is driven by the operating mechanism to rotate and separate from the upper and lower static contacts, the insulating slide 7 is released, and quickly moves to the position of the static contact 4 under the action of the spring 9. In the upper part, the insulating sliding piece 7 and the insulating partition plate 6 form an insulating cover and are arranged on the static contacts, which isolates the arc between the moving and static contacts and makes it extinguished. After adopting this solution, there is no need for a vacuum interrupter or filling of SF6 gas, and the cost is low, and the arc extinguishing is fast. Of course, the present invention can also be used for existing products to improve the arc extinguishing effect.

The above is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent shape or structural transformation made by using the description of the present invention and the contents of the accompanying drawings, or directly or indirectly used in other related technical fields, All are included in the scope of patent protection of the present invention in the same way.

Claims (5)

1. A medium-voltage switch arc extinguishing structure, the medium-voltage switch is provided with a moving contact and a static contact that forms a closing connection with the moving contact, and is characterized in that: it also includes a moving contact that can move synchronously with the moving contact The insulating sheet is located between the moving contact and the static contact in the opening state to isolate the arc, and a linkage mechanism is provided between the insulating sheet and the operating mechanism of the moving contact. 2. A medium voltage switch arc extinguishing structure as claimed in claim 1, characterized in that: said arc extinguishing plate is an insulating plate, which can move on the guide rail, and the switch is in an open state, and the insulating plate Placed between the static contact and the moving contact. 3. The arc extinguishing structure of a medium voltage switch according to claim 2, wherein a spring is hung on both sides of the insulating slide, and the other end of the spring is hung on the side wall of the load switch along the guide rail. 4. The arc extinguishing structure of the medium voltage switch according to claim 1, characterized in that: an insulating partition is provided in the switch parallel to the static contact, and the front end of the insulating sheet can move up to the insulating partition when the switch is opened. 5. The medium voltage switch arc extinguishing structure according to claim 1, characterized in that: the end of the insulating partition is provided with a protruding edge toward the insulating sheet side, and the protruding edge is set on the insulating sheet in the open state. above the front end.