A frame circuit breaker connection terminal protection structure

Abstract

The utility model discloses a frame circuit breaker connecting terminal protection structure, including the protection cover, left connecting plate and right connecting plate, and the both sides of circuit breaker connecting terminal are installed with copper row, and the structure of left connecting plate and right connecting plate is identical, and all are the L type structure of long flange face and short flange face composition, long flange face is fixedly installed with copper row, and short flange face is fixedly installed with protection cover, and left connecting plate and right connecting plate are located respectively left and right sides of protection cover, be provided with the boss portion on protection cover, be equipped with the insertion slot that is matched with copper row in boss portion, the rear side of protection cover away from boss portion is equipped with the guide piece, be equipped with the inclined plane on guide piece, the utility model discloses install after, the protection cover on the lower port connecting terminal can be isolated with the copper row of upper terminal connection effectively, make circuit breaker when opening and closing, and the instantaneous overvoltage of terminal place will not make the upper and lower terminal of same phase arc, thereby has improved the service life of circuit breaker.

Description

Technical Field

[0001] This utility model belongs to the technical field of auxiliary components for frame circuit breakers, and specifically relates to a protective structure for the connection terminals of a frame circuit breaker. Background Technology

[0002] In energy storage or wind power converters, frame circuit breakers are key components for grid connection. When the circuit breaker opens and closes, instantaneous overvoltages are generated at the terminals, which can easily cause arcing between the circuit breaker terminals. Circuit breakers are usually equipped with phase partitions, but partitions are rarely installed between the upper and lower terminals of the same phase. When the circuit breaker is installed in a cabinet and the heat dissipation ducts of the terminals are arranged vertically, the use of phase partitions can affect the heat dissipation of the terminals, causing the terminal temperature to be too high, which in turn affects the service life of the circuit breaker. Therefore, a terminal protection structure that can prevent arcing between the same phases of the frame circuit breaker without affecting heat dissipation is essential in the use of frame circuit breakers. Summary of the Invention

[0003] The purpose of this invention is to solve the problems in the prior art by proposing a protective structure for the connection terminals of a frame circuit breaker, which can solve the above problems.

[0004] To achieve the above objectives, this utility model proposes a protective structure for the connection terminals of a frame circuit breaker, including a protective cover, a left connecting plate, and a right connecting plate. Copper busbars are installed on both sides of the circuit breaker connection terminals. The left and right connecting plates have the same structure, both being L-shaped structures composed of a long folded edge and a short folded edge. The long folded edge is fixedly installed with the copper busbar, and the short folded edge is fixedly installed with the protective cover. The left and right connecting plates are located on the left and right sides of the protective cover, respectively. The protective cover is provided with a protrusion, and the protrusion has a slot that matches the copper busbar. A guide plate is provided on the rear side of the protective cover away from the protrusion, and the guide plate has an inclined surface.

[0005] Preferably, the protrusion is inserted into the end of the copper busbar, and the width of the slot is greater than the thickness of the copper busbar.

[0006] Preferably, the protective cover is made of SMC material.

[0007] Preferably, the protective cover is provided with a mounting protrusion, the mounting protrusion has a stepped countersunk hole, and the short folded edge surface has a mounting hole, the stepped countersunk hole and the mounting hole are connected by fasteners.

[0008] Preferably, a first press-fit nut is provided at the mounting hole, and the connecting screw passes through the stepped countersunk hole and is connected to the first press-fit nut.

[0009] Preferably, the long folded edge surface is provided with a plurality of connecting holes, and the connecting hole of the right connecting plate is provided with a second press-fit nut. The connecting screw passes through the connecting hole of the left connecting plate, the copper busbar on the left side, the circuit breaker connecting terminal, the copper busbar on the right side and the connecting hole of the right connecting plate in sequence and then connects with the second press-fit nut.

[0010] The beneficial effects of this utility model are as follows: After installation, the protective cover on the lower terminal can effectively isolate it from the upper terminal copper busbar, so that when the circuit breaker is opening and closing, the instantaneous overvoltage generated at the terminal will not cause arcing of the upper and lower terminals of the same phase, thereby improving the service life of the circuit breaker.

[0011] The tightening force of the screw is transmitted to the copper busbar through the long folded edge of the left connecting plate and the long folded edge of the right connecting plate. Because the contact surface is larger than the flat washer, the copper busbar is subjected to more uniform force, which can avoid the problem of increased contact thermal resistance and overheating of the connection point caused by excessive local stress in the copper busbar after the bolt is tightened.

[0012] The guide plate on the rear side of the protective cover has a slanted structure, which reduces insertion resistance and makes installation simpler.

[0013] The features and advantages of this utility model will be described in detail through embodiments and accompanying drawings. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is an installation diagram of this utility model;

[0016] Figure 3 This is a partially enlarged schematic diagram of the present invention;

[0017] Figure 4 This is a schematic diagram of the left connecting plate of this utility model;

[0018] Figure 5 This is a schematic diagram of the right connecting plate of this utility model;

[0019] Figure 6 This is a schematic diagram of the protective cover of this utility model;

[0020] Figure 7 This is a schematic diagram of the back of the protective cover of this utility model;

[0021] Figure 8 This is the front view of the protective cover of this utility model;

[0022] Figure 9 This is a top view of the protective cover of this utility model;

[0023] Figure 10This is a left view of the protective cover of this utility model.

[0024] In the diagram: 1. Protective cover; 2. Left connecting plate; 3. Right connecting plate; 4. Long folded edge; 41. Connecting hole; 5. Short folded edge; 51. Mounting hole; 9. Mounting protrusion; 10. Copper busbar; 11. Stepped countersunk hole; 12. Protrusion; 13. Guide plate. Detailed Implementation

[0025] See Figures 1 to 10 A protective structure for the connection terminals of a frame circuit breaker includes a protective cover 1, a left connecting plate 2, and a right connecting plate 3. Copper busbars 10 are installed on both sides of the circuit breaker connection terminals. The left connecting plate 2 and the right connecting plate 3 have the same structure, both being an L-shaped structure composed of a long folded edge 4 and a short folded edge 5. The long folded edge 4 is fixedly installed with the copper busbar 10, and the short folded edge 5 is fixedly installed with the protective cover 1. The left connecting plate 2 and the right connecting plate 3 are located on the left and right sides of the protective cover 1, respectively. The protective cover 1 is provided with a protrusion 12, and the protrusion 12 is provided with a slot that matches the copper busbar 10. The protective cover 1 is provided with a guide plate 13 on the rear side away from the protrusion 12, and the guide plate 13 is provided with an inclined surface.

[0026] The protrusion 12 is inserted into the end of the copper busbar 10, and the width of the slot is greater than the thickness of the copper busbar 10.

[0027] The protective cover 1 is made of SMC material, which has excellent insulation properties.

[0028] The protective cover 1 is provided with a mounting protrusion 9, and the mounting protrusion 9 is provided with a stepped countersunk hole 11. The short folded edge surface 5 is provided with a mounting hole 51. The stepped countersunk hole 11 and the mounting hole 51 are connected by fasteners.

[0029] A first press-fit nut is provided at the mounting hole 51. The connecting screw passes through the stepped countersunk hole 11 and is connected to the first press-fit nut. The head of the connecting screw is smaller than the depth of the stepped countersunk hole 11.

[0030] The long folded edge surface 4 is provided with three connecting holes 41 arranged in a straight line. The connecting hole 41 of the right connecting plate 3 is provided with a second press-fit nut. The connecting screw passes through the connecting hole 41 of the left connecting plate 2, the copper busbar 10 on the left side, the circuit breaker connecting terminal, the copper busbar 10 on the right side and the connecting hole 41 of the right connecting plate 3 in sequence and then connects with the second press-fit nut.

[0031] After installation, the protective cover on the lower terminal of the circuit breaker connected to the copper busbar can effectively isolate it from the upper terminal connected to the copper busbar. This prevents the upper and lower terminals of the same phase from arcing when the circuit breaker is opened or closed due to instantaneous overvoltage at the terminals, thereby improving the service life of the circuit breaker.

[0032] The above embodiments are illustrative of the present invention and are not intended to limit the present invention. Any simple modifications to the present invention are within the protection scope of the present invention.

Claims

1. A protective structure for the connection terminals of a frame circuit breaker, characterized in that: The circuit breaker includes a protective cover (1), a left connecting plate (2) and a right connecting plate (3). Copper busbars (10) are installed on both sides of the circuit breaker connection terminals. The left connecting plate (2) and the right connecting plate (3) have the same structure, which is an L-shaped structure composed of a long folded edge (4) and a short folded edge (5). The long folded edge (4) is fixedly installed with the copper busbar (10), and the short folded edge (5) is fixedly installed with the protective cover (1). The left connecting plate (2) and the right connecting plate (3) are located on the left and right sides of the protective cover (1), respectively. The protective cover (1) is provided with a protrusion (12). The protrusion (12) is provided with a slot that matches the copper busbar (10). The protective cover (1) is provided with a guide plate (13) on the rear side away from the protrusion (12). The guide plate (13) is provided with an inclined surface.

2. The protective structure for the connection terminals of the frame circuit breaker as described in claim 1, characterized in that: The protrusion (12) is inserted into the end of the copper busbar (10), and the width of the slot is greater than the thickness of the copper busbar (10).

3. The protective structure for the connection terminals of the frame circuit breaker as described in claim 1, characterized in that: The protective cover (1) is made of SMC material.

4. The protective structure for the connection terminals of the frame circuit breaker as described in claim 1, characterized in that: The protective cover (1) is provided with a mounting protrusion (9), the mounting protrusion (9) is provided with a stepped countersunk hole (11), and the short folded edge surface (5) is provided with a mounting hole (51). The stepped countersunk hole (11) and the mounting hole (51) are connected by fasteners.

5. The protective structure for the connection terminals of a frame circuit breaker as described in claim 4, characterized in that: A first press-fit nut is provided at the mounting hole (51), and the connecting screw is connected to the first press-fit nut after passing through the stepped countersunk hole (11).

6. The protective structure for the connection terminals of the frame circuit breaker as described in claim 1, characterized in that: The long folded edge surface (4) is provided with several connecting holes (41). The connecting hole (41) of the right connecting plate (3) is provided with a second press-fit nut. The connecting screw passes through the connecting hole (41) of the left connecting plate (2), the copper busbar (10) on the left side, the circuit breaker connecting terminal, the copper busbar (10) on the right side and the connecting hole (41) of the right connecting plate (3) in sequence and then connects with the second press-fit nut.

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