Static contact structure of medium-voltage ring main unit circuit breaker

Abstract

The utility model relates to a static contact structure of a medium-voltage ring main unit circuit breaker, which comprises a base and a static contact plate which are integrally formed, the base is of a cuboid structure, a screw mounting hole used for connecting a static end of the circuit breaker is arranged on the base, the base is arranged at the lower part of the static contact plate, and a groove for accommodating the static contact plate is arranged on the side wall of the base. A groove is formed in the base, the static contact plate is arranged in the groove, the end faces of the two sides of the static contact plate are two vertically-arranged contact planes, the contact planes are trapezoidal, the side, close to the base, of each contact plane is provided with a contact edge arc-shaped chamfer, and the contact edge arc-shaped chamfers of the two contact planes are matched to form a transition guide part facilitating contact between the moving contact and the contact planes; the static contact structure ensures enough contact area with the moving contact, reduces contact resistance, reduces heating, improves conductivity and breaking capacity, ensures proper contact pressure between the static contact structure and the moving contact, enables the static contact structure and the moving contact to be tightly contacted, prevents poor contact, and is easy to disassemble and replace.

Description

Technical Field

[0001] This utility model relates to the field of medium-voltage circuit breaker technology, and in particular to a static contact structure of a medium-voltage ring main unit circuit breaker. Background Technology

[0002] Medium-voltage circuit breakers, as key control and protection devices in power systems, are widely used in medium-voltage power distribution systems in industrial, commercial, and civil buildings. The stationary contact is one of its core components. In a medium-voltage circuit breaker, the stationary and moving contacts work together to connect and disconnect the circuit and transmit current. Their performance directly affects the circuit breaker's conductivity, breaking capacity, and service life.

[0003] However, with the development of power systems and the increasing demands for power supply reliability, existing medium-voltage circuit breaker stationary contacts have revealed some problems and shortcomings in practical applications. For example, the conductivity of some stationary contacts is not ideal, resulting in high contact resistance, which easily leads to overheating during long-term operation, affecting the stability and service life of the circuit breaker. In addition, the structural design of some stationary contacts is not optimized, failing to effectively guide the arc when breaking current, resulting in a longer arc extinguishing time, reducing the breaking speed and efficiency of the circuit breaker, and making it difficult to meet the requirement of quickly interrupting fault current.

[0004] To address the aforementioned issues, developing a medium-voltage circuit breaker stationary contact with superior performance and higher reliability is of great significance. The new stationary contact design requires breakthroughs in conductivity, breaking capacity, material high-temperature resistance, and structural optimization to meet the high-performance requirements of modern power systems for medium-voltage circuit breakers and improve the safety and stability of the entire power distribution system.

[0005] Therefore, this utility model proposes a static contact structure for a medium-voltage ring main unit circuit breaker to solve the above problems. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a static contact structure for a medium-voltage ring main unit circuit breaker that ensures sufficient contact area with the moving contact, reduces contact resistance, reduces heat generation, improves conductivity and breaking capacity, ensures appropriate contact pressure between the static and moving contacts, makes them tightly connected, prevents poor contact, and is easy to disassemble and replace.

[0007] To solve the above-mentioned technical problems, the technical solution of this utility model is: a stationary contact structure for a medium-voltage ring main unit circuit breaker, the innovation of which is: including an integrally formed base for connecting the stationary end of the circuit breaker and a stationary contact plate for connecting the moving contact;

[0008] The base has a cuboid structure and screw mounting holes for connecting the stationary end of the circuit breaker. The base is located below the stationary contact plate. The side wall of the base has a groove to accommodate the stationary contact plate. The stationary contact plate is placed in the groove. The two end faces of the stationary contact plate are two vertically arranged contact planes. The contact planes are trapezoidal in shape. Each contact plane has a chamfered contact edge on the side closest to the base. The chamfered contact edges of the two contact planes cooperate to form a transition guide that facilitates contact between the moving contact and the contact plane.

[0009] Furthermore, the groove on the base extends horizontally outward on both sides to form two reinforcing protrusions. The sides of the reinforcing protrusions include a stationary contact plate connecting surface and an S-shaped curved surface. The stationary contact plate connecting surface is connected to the stationary contact plate. The S-shaped curved surface is located on the side of the stationary contact plate connecting surface away from the stationary contact plate. The edge of the S-shaped curved surface away from the base is connected to the stationary contact plate connecting surface to form a tip. The distance between the S-shaped curved surface and the stationary contact plate gradually decreases from the base towards the tip.

[0010] Furthermore, the screw mounting hole is a countersunk hole.

[0011] Furthermore, the height of the base is 12~17mm.

[0012] Furthermore, the radius of the chamfered edge of the contact point is 3~5mm.

[0013] Furthermore, all the surface corners of the stationary contact structure are chamfered.

[0014] The advantages of this utility model are:

[0015] The stationary contact structure of this utility model utilizes a trapezoidal contact plane to contact the moving contact. This not only provides a large contact area, effectively reducing contact resistance and heat generation, but also effectively guides the arc during current segmentation, shortening the arc extinction time and improving the segmentation speed and efficiency of the circuit breaker. Furthermore, by designing arc-shaped chamfers at the contact edges on the two contact planes, these chamfers form a transition guide at the end of the stationary contact plate. This not only makes it easier for the moving contact to contact the contact plane, but also facilitates a tight, gapless contact between the moving contact and the contact plane, ensuring appropriate contact pressure and effectively preventing poor contact. The base has screw mounting holes, allowing the stationary contact structure to be connected to the stationary end of the circuit breaker via screws, making it easy to disassemble and replace.

[0016] This invention features two reinforcing protrusions on the base. The S-shaped curved surface of the reinforcing protrusions connects with the contact surface of the stationary contact plate to form a tip. The distance between the S-shaped curved surface and the stationary contact plate gradually decreases from the base towards the tip. This design not only enhances the connection strength between the stationary contact plate and the base and strengthens the deformation resistance of the stationary contact plate, but also effectively guides the arc during segmented current operation, further shortening the arc extinguishing time.

[0017] The screw mounting hole of this utility model is a countersunk hole. The stationary contact is connected to the stationary end of the circuit breaker through the countersunk hole and screw, which is firm and reliable and can withstand the vibration and impact force generated by the circuit breaker during operation. Attached Figure Description

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0019] Figure 1 This is a schematic diagram of the stationary contact structure of the medium-voltage ring main unit circuit breaker of this utility model. Detailed Implementation

[0020] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0021] Example

[0022] This embodiment provides a static contact structure for a medium-voltage ring main unit circuit breaker, such as... Figure 1 As shown, it includes an integrally formed base 1 for connecting the stationary end of the circuit breaker and a stationary contact plate 2 for connecting the moving contact.

[0023] The base 1 has a rectangular structure with a height of 12-17mm. It is mounted on the top of the stationary terminal of the circuit breaker using screws. The base 1 has four U-shaped screw mounting holes 12 for connecting to the stationary terminal, facilitating easy disassembly and replacement of the stationary contact structure. The screw mounting holes 12 are countersunk holes, allowing the stationary contact structure to connect securely and reliably to the stationary terminal of the circuit breaker via countersunk holes and screws, ensuring it can withstand vibrations and impacts generated during circuit breaker operation. The base 1 is located below the stationary contact plate 2. A groove for accommodating the stationary contact plate 2 is formed on the side wall of the base 1. The stationary contact plate 2 is positioned within this groove. The two end faces of the stationary contact plate 2 have two vertically arranged contact planes 21, which are trapezoidal in shape, ensuring sufficient contact area between the stationary contact structure and the moving contact. Each contact surface 21 has a chamfered contact edge 22 on the side near the base 1. The radius of the chamfered contact edge is 3~5mm. The chamfered contact edges 22 of the two contact surfaces 21 cooperate to form a transition guide that facilitates contact between the moving contact and the contact surface 21. This transition guide not only makes it easier for the moving contact to contact the contact surface 21, but also helps to achieve a tight contact between the moving contact and the contact surface 21 without gaps, ensuring appropriate contact pressure between the moving contact and the contact surface 21, and effectively preventing poor contact.

[0024] In this embodiment, two reinforcing protrusions 11 extend horizontally outward from both sides of the groove on the base 1. The sides of the reinforcing protrusions 11 include a stationary contact plate connecting surface and an S-shaped curved surface. The stationary contact plate connecting surface is connected to the stationary contact plate 2. The S-shaped curved surface is located on the side of the stationary contact plate connecting surface away from the stationary contact plate 2. The edge of the S-shaped curved surface away from the base 1 connects with the stationary contact plate connecting surface to form a tip. The distance between the S-shaped curved surface and the stationary contact plate 2 gradually decreases from the base 1 towards the tip. This design not only improves the connection strength between the stationary contact plate 2 and the base 1 and enhances the deformation resistance of the stationary contact plate 2, but also effectively guides the arc during segmented current, further shortening the arc extinguishing time. The surface corners of the stationary contact structure are all chamfered to prevent insulation breakdown or flashover.

[0025] The stationary contact structure ensures sufficient contact area between the stationary and moving contacts to reduce contact resistance and heat generation. It also effectively guides the arc during segmented current, shortens the arc extinction time, improves conductivity and breaking capacity, and ensures appropriate contact pressure between the stationary and moving contacts to ensure tight contact and prevent poor contact.

[0026] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A static contact structure of a medium voltage ring main unit circuit breaker, characterized in that: It includes an integrally molded base for connecting the stationary end of the circuit breaker and a stationary contact plate for connecting the moving contact; The base has a cuboid structure and screw mounting holes for connecting the stationary end of the circuit breaker. The base is located below the stationary contact plate. The side wall of the base has a groove to accommodate the stationary contact plate. The stationary contact plate is placed in the groove. The two end faces of the stationary contact plate are two vertically arranged contact planes. The contact planes are trapezoidal in shape. Each contact plane has a chamfered contact edge on the side closest to the base. The chamfered contact edges of the two contact planes cooperate to form a transition guide that facilitates contact between the moving contact and the contact plane.

2. The stationary contact structure of the medium voltage ring main unit circuit breaker according to claim 1, characterized in that: The groove on the base extends horizontally outward on both sides to form two reinforcing protrusions. The sides of the reinforcing protrusions include a stationary contact plate connecting surface and an S-shaped curved surface. The stationary contact plate connecting surface is connected to the stationary contact plate. The S-shaped curved surface is located on the side of the stationary contact plate connecting surface away from the stationary contact plate. The edge of the S-shaped curved surface away from the base is connected to the stationary contact plate connecting surface to form a tip. The distance between the S-shaped curved surface and the stationary contact plate gradually decreases from the base towards the tip.

3. The stationary contact structure of the medium voltage ring main unit circuit breaker according to claim 1, characterized in that: The screw mounting hole is a countersunk hole.

4. The stationary contact structure of the medium voltage ring main unit circuit breaker according to claim 1, characterized in that: The height of the base is 12~17mm.

5. The stationary contact structure of the medium voltage ring main unit circuit breaker according to claim 1, characterized in that: The radius of the chamfered edge at the contact point is 3-5 mm.

6. The stationary contact structure of the medium-voltage ring main unit circuit breaker according to claim 1, characterized in that: All edges and corners of the stationary contact structure are chamfered.

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