High-voltage molded case circuit breaker terminal cover

Abstract

The utility model relates to the technical field of circuit breaker equipment, in particular to a high-voltage molded case circuit breaker terminal cover, and aims to guarantee safe operation of a power system and improve arc isolating and extinguishing performance of a circuit breaker. The terminal cover comprises a shell and an insulating plate; the shell is installed at the wire inlet end of the circuit breaker, and the insulating plate is installed on the side edge of the circuit breaker. The side face, opposite to the end of the circuit breaker, of the shell and the side face, opposite to the insulating plate, of the shell are provided with grating holes respectively. A plurality of parallel clamping grooves are formed in the shell, arc extinguishing grid sheets are arranged on the clamping grooves, and large grid holes and small grid holes are formed in the arc extinguishing grid sheets. The inner wall of the shell and the end face of the circuit breaker are enclosed to form a large arc extinguishing cavity, and the arc extinguishing grid sheets divide the large arc extinguishing cavity into a plurality of small cavities, so that the arc extinguishing capability is improved.

Description

Technical Field

[0001] This invention relates to the field of circuit breaker equipment technology, and in particular to a terminal cover for a high-voltage molded case circuit breaker. Background Technology

[0002] With the rapid development of photovoltaic power generation systems, their application in low-voltage industries is becoming increasingly widespread. To meet the control and protection requirements of photovoltaic power generation systems for high voltage and high current, the use of high-voltage circuit breakers is becoming more common. These circuit breakers can quickly interrupt current during circuit faults, protecting electrical equipment and personnel. However, when a high-voltage circuit breaker trips, a large amount of electric arc is emitted from the breaker, potentially leading to phase-to-phase short circuits and other safety hazards. To ensure the safe operation of the power system, since the arc-extinguishing chamber is located on the incoming line side, a terminal cover needs to be installed at the incoming end of the high-voltage circuit breaker to improve its arc-blocking and arc-extinguishing performance. Summary of the Invention

[0003] In view of this, the purpose of this invention is to provide a terminal cover for a high-voltage molded case circuit breaker, in order to ensure the safe operation of the power system and improve the arc isolation and arc extinguishing performance of the circuit breaker.

[0004] To achieve the above objectives, the present invention provides a terminal cover for a high-voltage molded case circuit breaker. The terminal cover includes a housing and an insulating plate. The housing is installed at the incoming end of the circuit breaker, and the insulating plate is installed on the side of the circuit breaker. The housing has grid holes on its side relative to the circuit breaker end and on its side relative to the insulating plate. The housing interior has several parallel slots, each slot having an arc-extinguishing grid with large and small grid holes. The inner wall of the housing and the circuit breaker end face together form a large arc-extinguishing cavity, which is divided into multiple smaller chambers by the arc-extinguishing grid, increasing the arc-extinguishing capability.

[0005] As a further improvement of this application, the housing is provided with a longitudinal partition, and the longitudinal partition is also provided with the slot.

[0006] As a further improvement of this application, the longitudinal partition and the inner wall of the housing are also provided with a longitudinal groove, the longitudinal groove is perpendicular to the slot, and a baffle is provided on the longitudinal groove. The baffle, the longitudinal partition, the inner wall of the housing and the circuit breaker end face enclose an arc extinguishing cavity, and the arc extinguishing grid divides the arc extinguishing cavity into several small chambers.

[0007] As a further improvement of this application, the arc-extinguishing grid is provided with a large hole group composed of the large grid holes and a small hole group composed of the small grid holes. The large hole group and the small hole group are arranged at intervals, and the projection of the large hole group of the upper arc-extinguishing grid faces the small hole group of the adjacent lower arc-extinguishing grid.

[0008] As a further improvement of this application, the circuit breaker end face has a notch, and the housing is also provided with a raised cover that covers the notch.

[0009] As a further improvement of this application, the circuit breaker end face is provided with side grooves on both sides, and the housing is also provided with convex strips to fill the side grooves.

[0010] As a further improvement of this application, the circuit breaker end face is provided with top grooves on both sides, and the longitudinal partition is also provided with a central protrusion to fill the top grooves.

[0011] The beneficial effects of this invention are as follows: A large arc-extinguishing cavity is formed by the inner wall of the housing and the end face of the circuit breaker, and the arc-extinguishing grid divides the large arc-extinguishing cavity into multiple small chambers, increasing the arc-extinguishing capacity. Further confinement by the baffle and the longitudinal partition further enhances the arc-extinguishing capacity. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in this invention 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 for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the structure of a high-voltage molded case circuit breaker terminal cover and the circuit breaker after installation, according to an embodiment of the present invention.

[0014] Figure 2 This is a schematic diagram of the structure of a high-voltage molded case circuit breaker terminal cover according to an embodiment of the present invention;

[0015] Figure 3 This is a schematic diagram of the structure of a baffle plate for a terminal cover of a high-voltage molded case circuit breaker according to an embodiment of the present invention;

[0016] Figure 4 This is a schematic diagram of the terminal cover of a high-voltage molded case circuit breaker according to another perspective of an embodiment of the present invention;

[0017] Figure 5 This is a schematic diagram of the side top view of the terminal cover of a high-voltage molded case circuit breaker according to an embodiment of the present invention;

[0018] Figure 6 This is a schematic diagram of the arc-extinguishing grid of the terminal cover of a high-voltage molded case circuit breaker according to an embodiment of the present invention.

[0019] The diagram is marked as follows:

[0020] 1. Housing; 2. Circuit breaker; 3. Insulating plate; 4. Raised cover; 5. Central raised strip; 6. Raised strip; 10. Baffle; 11. Longitudinal partition; 13. Slot; 14. Longitudinal groove; 15. Arc extinguishing grid plate; 16. Large grid hole; 17. Small grid hole; 18. Grid hole. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0022] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0023] like Figure 1-6 As shown, a high-voltage molded case circuit breaker terminal cover includes a housing 1 and an insulating plate 3. The housing 1 is installed at the inlet terminal of the circuit breaker 2, and the insulating plate 3 is installed on the side of the circuit breaker 2. The housing 1 has grid holes 18 on its side relative to the end of the circuit breaker 2 and on its side relative to the insulating plate 3. The housing 1 has several parallel slots 13 inside, and arc-extinguishing grids 15 are provided on the slots 13. The arc-extinguishing grids 15 have large grid holes 16 and small grid holes 17. The inner wall of the housing and the end face of the circuit breaker form a large arc-extinguishing cavity, and the arc-extinguishing grids divide the large arc-extinguishing cavity into multiple small chambers, increasing the arc-extinguishing capability.

[0024] To further enhance arc-extinguishing capability, a longitudinal partition 11 is provided inside the housing 1, and the slot 13 is also provided on the longitudinal partition 11. A longitudinal groove 14 is also provided on the longitudinal partition 11 and the inner wall of the housing 1, and the longitudinal groove 14 is perpendicular to the slot 13. Figure 2 and Figure 3As shown, a baffle 10 is provided on the longitudinal groove 14. The baffle 10, the longitudinal partition 11, the inner wall of the housing 1, and the end face of the circuit breaker 2 enclose an arc-extinguishing cavity. The arc-extinguishing grid 15 divides the arc-extinguishing cavity into several small chambers. The arc-extinguishing capability is further improved by the further restriction of the baffle and the longitudinal partition.

[0025] To achieve arc extinguishing capability, the arc extinguishing grid 15 is provided with a large hole group consisting of large grid holes 16 and a small hole group consisting of small grid holes 17. The large hole group and the small hole group are arranged alternately. To improve the arc extinguishing effect between adjacent arc extinguishing grids 15, the projection of the large hole group of the upper arc extinguishing grid 15 faces the small hole group of the lower adjacent arc extinguishing grid 15. In this way, the arc needs to pass through the large hole group and the small hole group between the upper and lower adjacent arc extinguishing grids 15, thereby improving the arc extinguishing capability and increasing the resistance to arc passage.

[0026] To enhance coverage and connection tightness, the circuit breaker 2 has a notch on its end face, and the housing 1 is also provided with a raised cover 4 covering the notch. Side grooves are provided on both sides of the end face of the circuit breaker 2, and the housing 1 is also provided with raised strips 6 filling the side grooves. Top grooves are provided on both sides of the end face of the circuit breaker 2, and the longitudinal partition 11 is also provided with a central raised strip 5 filling the top groove.

[0027] To increase robustness, the housing 1 is provided with mounting holes, and bolts are installed onto the insulating plate 3 by passing through the mounting holes, so that the housing 1 is tightly connected.

[0028] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in the details for the sake of brevity.

[0029] This invention is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A terminal cover for a high-voltage molded case circuit breaker, characterized in that, The terminal cover includes a housing (1) and an insulating plate (3); The housing (1) is installed at the incoming end of the circuit breaker (2), and the insulating plate (3) is installed on the side of the circuit breaker (2); The housing (1) has grid holes (18) on the side opposite to the end of the circuit breaker (2) and on the side opposite to the insulating plate (3); The housing (1) has several parallel slots (13) inside, and arc-extinguishing grid plates (15) are provided on the slots (13). The arc-extinguishing grid plates (15) are provided with large grid holes (16) and small grid holes (17).

2. The high-voltage molded case circuit breaker terminal cover according to claim 1, characterized in that, The housing (1) is provided with a longitudinal partition (11), and the longitudinal partition (11) is also provided with the slot (13).

3. The high-voltage molded case circuit breaker terminal cover according to claim 2, characterized in that, The longitudinal partition (11) and the inner wall of the housing (1) are also provided with a longitudinal groove (14). The longitudinal groove (14) is perpendicular to the slot (13). A baffle (10) is provided on the longitudinal groove (14). The baffle (10), the longitudinal partition (11), the inner wall of the housing (1) and the end face of the circuit breaker (2) enclose an arc-extinguishing cavity. The arc-extinguishing grid plate (15) divides the arc-extinguishing cavity into several small chambers.

4. The terminal cover of the high-voltage molded case circuit breaker according to claim 3, characterized in that, The arc-extinguishing grid plate (15) is provided with a large hole group composed of the large grid holes (16) and a small hole group composed of the small grid holes (17). The large hole group and the small hole group are arranged at intervals. In order to enhance the arc-extinguishing effect, the projection of the large hole group of the upper arc-extinguishing grid plate (15) faces the small hole group of the adjacent lower arc-extinguishing grid plate (15).

5. The terminal cover of the high-voltage molded case circuit breaker according to claim 1, characterized in that, The circuit breaker (2) has a notch on its end face, and the housing (1) is also provided with a raised cover (4) covering the notch.

6. The terminal cover of the high-voltage molded case circuit breaker according to claim 1, characterized in that, The circuit breaker (2) has side grooves on both sides of its end face, and the housing (1) is also provided with protrusions (6) to fill the side grooves.

7. The high-voltage molded case circuit breaker terminal cover according to claim 2, characterized in that, The circuit breaker (2) has top grooves on both sides of its end face, and the longitudinal partition (11) is also provided with a central protrusion (5) to fill the top grooves.

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