Frame for direct current circuit breaker
The overheating problem is solved by adding multiple ventilation cutouts to the large-capacity DC circuit breaker frame, improving thermal performance and reducing costs, ensuring safe and reliable operation of the equipment under high load conditions.
Patent Information
- Application Number
- CN202420277064.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-05
- Publication Date
- 2025-01-10
- Estimated Expiration
- 2034-02-05
AI Technical Summary
Large-capacity DC circuit breakers are prone to failure due to overheating under high nominal current, resulting in equipment damage and safety hazards.
By adding side cuts to the DC circuit breaker frame, improving thermal performance, designing frame structures with multiple ventilation cuts to cover and protect components, optimizing material use to reduce costs.
Improves the thermal performance of DC circuit breakers at nominal current of 8000A, ensures the equipment is operating normally under high load conditions, reduces component costs, and verifies performance through European standard temperature rise tests.
Smart Images
Figure CN222338192U_ABST
Abstract
Description
Technical Field
[0001] The utility model generally relates to a direct current (DC) circuit breaker system and more particularly to a DC circuit breaker with an improved thermal management system. Background Art
[0002] Usually, a circuit breaker is used in a circuit and is located between the power source and the load to control the continuity of the circuit. When it identifies an irregular current, it disconnects the circuit to protect equipment and people.
[0003] Large-capacity DC circuit breakers can operate at nominal currents of up to 8000 A. This high load creates several problems, one of which is overheating of components. Due to overheating, the DC circuit breaker cannot operate properly, which can cause damage to equipment and pose a danger to people.
[0004] EP 3389067B1 discloses a high-speed circuit breaker for industrial and railway applications. The circuit breaker has a housing comprising a synthetic plastic material structure having a predetermined isolation factor. The housing comprises a pair of protective walls covering the circuit breaker base portion and the intermediate switch or disconnect contact portion from two main sides, leaving only a central opening open. The protective walls allow better and more efficient isolation than that provided by air. Such an opening is provided for quick lateral inspection.
[0005] As mentioned above, such DC breakers often face the challenge of overheating, leading to potential problems. Therefore, there is a need for an accurate, reliable and compact DC breaker system. These systems should have a simple design and structure, ensuring that they will not be affected by overheating even when subjected to relatively large nominal currents. Utility Model Content
[0006] To overcome the overheating problem, the DC breaker frame structure is improved by adding side cutouts. These features help improve the thermal performance of the DC breaker at a nominal current of 8000A and help optimize component cost due to the use of less material.
[0007] The performance of the utility model is confirmed internally through temperature rise tests according to European standards.
[0008] According to a first aspect, a frame for a DC circuit breaker is provided, which has a left side and a right side for covering and protecting components of the DC circuit breaker from the left side and the right side, respectively, wherein the left side and the right side of the frame have a plurality of ventilation cutouts for heat dissipation, at least three of the ventilation cutouts are located in the lower part of the left side and the right side of the frame.
[0009] According to one or more embodiments, the left side of the frame has a total of four cutouts.
[0010] According to one or more embodiments, a component of a DC circuit breaker includes a first stationary contact, a second stationary contact, and a circuit breaker mechanism, wherein the circuit breaker mechanism has a first flexible member corresponding to a solid movable part and a second flexible member corresponding to an elastic part, and the four cutouts are positioned as follows: the first cutout A is located in front of the first flexible member, the second cutout A is located in front of the second stationary contact, the third cutout A is located below the second flexible member, and the fourth cutout A is located on the side of the circuit breaker mechanism.
[0011] According to one or more embodiments, the right side of the frame has a total of four cutouts.
[0012] According to one or more embodiments, a component of a DC circuit breaker includes a first stationary contact, a second stationary contact, and a circuit breaker mechanism, wherein the circuit breaker mechanism has a first flexible member corresponding to a solid movable part and a second flexible member corresponding to an elastic part, and the four cutouts are positioned as follows: the first cutout B is located in front of the first flexible member, the second cutout B is located in front of the second stationary contact, the third cutout B is located below the second flexible member, and the fourth cutout B is located on the side of the circuit breaker mechanism.
[0013] According to one or more embodiments, the left and right sides of the frame have corresponding holes and screw guides that allow the left and right sides of the frame to be assembled together. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 2 is a diagram showing a DC circuit breaker frame structure according to the present invention.
[0015] Figure 2 1 is a diagram showing the outer left side of the DC breaker frame structure according to the present invention.
[0016] Figure 3 1 is a diagram showing the inner left side of the DC breaker frame structure according to the present invention.
[0017] Figure 4 1 is a diagram showing the outer right side of the DC breaker frame structure according to the present invention.
[0018] Figure 5 1 is a diagram showing the inner right side of the DC circuit breaker frame structure according to the present invention. DETAILED DESCRIPTION
[0019] According to the utility model, the frame 1 for DC circuit breaker is Figure 1 In the assembled state, Figure 2-Figure 5 It is shown in the exploded state. Figure 2-Figure 3 The left side 2 of the DC breaker frame 1 is shown respectively, Figure 4-Figure 5The right side 3 of the DC breaker frame 1 is shown. More specifically, Figure 2 The left side 2 of the DC breaker frame 1 is shown from the outside. Figure 3 The left side 2 of the DC breaker frame 1 is shown from the inside. Figure 4 The right side 3 of the DC breaker frame 1 is shown from the outside. Figure 5 The right side 3 of the DC breaker frame 1 is shown from the inside.
[0020] According to the present invention, the proposed frame 1 for a DC circuit breaker is used at a nominal current of 8000 A. However, it can also be used at a nominal current lower than 8000A.
[0021] The frame 1 for a DC breaker has a left side 2 and a right side 3 for covering and protecting the components of the DC breaker from the left and right sides, respectively. The left side 2 and the right side 3 of the frame 1 have ventilation cutouts for heat dissipation.
[0022] The left side 2 of the frame 1 preferably has a total of four cutouts.
[0023] The components of the DC circuit breaker include a first stationary contact, a second stationary contact and a circuit breaker mechanism, wherein the circuit breaker mechanism has a first flexible member corresponding to the solid movable part and a second flexible member corresponding to the elastic part, then the four cutouts in the frame 1 are preferably positioned as follows: the first cutout A2a is located in front of the first flexible member, the second cutout A2d is located in front of the second stationary contact, the third cutout A2c is located below the second flexible member, and the fourth cutout A2b is located on the side of the circuit breaker mechanism.
[0024] The right side 3 of the frame 1 preferably has a total of four cutouts.
[0025] The components of the DC circuit breaker include a first stationary contact, a second stationary contact and a circuit breaker mechanism, wherein the circuit breaker mechanism has a first flexible member corresponding to the solid movable part and a second flexible member corresponding to the elastic part, then the four cutouts in the frame 1 are preferably positioned as follows: the first cutout B3a is located in front of the first flexible member, the second cutout B3d is located in front of the second stationary contact, the third cutout B3c is located below the second flexible member, and the fourth cutout B3b is located on the side of the circuit breaker mechanism.
[0026] The assembly of the DC breaker as described above is typical. However, the DC breaker frame according to the present invention is not limited to such an assembly. It is applicable to any working assembly that can be accommodated inside the frame according to the present invention. This assembly is not part of the present invention.
[0027] The left and right sides 2, 3 of the frame 1 preferably have corresponding holes and screw guides which allow the left and right sides 2, 3 of the frame 1 to be assembled together.
[0028] The frame 1 according to the invention is preferably made of a non-flammable and self-extinguishing thermosetting material. However, some or all of its parts may also be made of another material, as long as the material is durable enough to protect the mechanism of the DC breaker.
[0029] According to the present invention, within the framework of the DC breaker 1, the breaker mechanism is mechanical, but may also be solid state. The breaker mechanism is centrally arranged to ensure easy maintenance and uniform force distribution during its operation.
[0030] In the frame 1 according to the invention, stationary contacts are located above and below the circuit breaker mechanism. These contacts are connected and held in place relative to the frame 1 using screws, for example.
[0031] In some embodiments of the present invention, the frame 1 may be combined with additional cooling components, such as a heat sink or a fan connected to the frame 1 using screws.
[0032] The input and output terminals are located at the top or bottom of the frame 1. They are designed for robustness and accessibility of circuit connection.
[0033] According to the invention, the frame 1 has means for securely mounting the DC circuit breaker on the tram inside the switchgear, with screw guides and holes to ensure the stability of the circuit breaker during operation.
[0034] The present improvement of the frame shape results in improved ventilation and cooling of the current paths, optimization of part costs due to the use of less material and no need for additional machining, easy access in case of installation / maintenance of additional accessories.
Claims
1. A frame (1) for a DC circuit breaker, having a left side (2) and a right side (3), for covering and protecting components of the DC circuit breaker from the left side and the right side, respectively, wherein the left side (2) and the right side (3) of the frame (1) have a plurality of ventilation cutouts for heat dissipation, characterized in that: At least three of the ventilation cutouts are located in the lower portion of the left side (2) and the right side (3) of the frame (1).
2. The frame according to claim 1, characterized in that The left side (2) of the frame (1) has a total of four cutouts.
3. The frame according to claim 2, characterized in that The component of the DC circuit breaker includes a first stationary contact, a second stationary contact and a circuit breaker mechanism, wherein the circuit breaker mechanism has a first flexible member corresponding to a solid movable part and a second flexible member corresponding to an elastic part, and the four cutouts are positioned as follows: the first cutout A (2a) is located in front of the first flexible member, the second cutout A (2d) is located in front of the second stationary contact, the third cutout A (2c) is located below the second flexible member, and the fourth cutout A (2b) is located on the side of the circuit breaker mechanism.
4. The frame according to claim 1, characterized in that The right side (3) of the frame (1) has a total of four cutouts.
5. The frame according to claim 4, characterized in that The component of the DC circuit breaker includes a first stationary contact, a second stationary contact and a circuit breaker mechanism, wherein the circuit breaker mechanism has a first flexible member corresponding to a solid movable part and a second flexible member corresponding to an elastic part, and the four cutouts are positioned as follows: the first cutout B (3a) is located in front of the first flexible member, the second cutout B (3d) is located in front of the second stationary contact, the third cutout B (3c) is located below the second flexible member, and the fourth cutout B (3b) is located on the side of the circuit breaker mechanism.
6. The frame according to claim 1, characterized in that The left side (2) and the right side (3) of the frame (1) have corresponding holes and screw guides, which allow the left side (2) and the right side (3) of the frame (1) to be assembled together.