A compact low-voltage fixed switchgear that meets temperature rise test requirements

Abstract

This utility model relates to the field of compact low-voltage fixed switchgear technology, and discloses a compact low-voltage fixed switchgear that meets the requirements of temperature rise testing, including a cabinet; and a main busbar installed inside the cabinet; the front end of the cabinet is divided into a circuit breaker compartment and a component compartment from top to bottom, the right side of the circuit breaker compartment is set as a metering compartment, and the rear end of the cabinet is set as a busbar compartment. By using the gap of the plastic case cover plate in front of the molded case switch to reduce the contact area with the metal cabinet plate, it is beneficial to the heat dissipation on this side. In addition, the installation of the molded case switch by the mounting beam reduces the reverse heat transfer from the metal cabinet plate, thereby reducing the temperature rise and improving the heat dissipation effect. By adopting a profile splicing cabinet, the splicing strength and rigidity of the entire frame are improved by using C-shaped profiles, upper and lower crossbeams, pressure plates and bracing; the use of vertically installed busbars allows high-temperature airflow to flow freely upward from below and directly conduct through the top plate to the outside, improving the heat dissipation effect of the cabinet.

Description

Technical Field

[0001] This utility model relates to the technical field of compact low-voltage fixed switchgear, specifically a compact low-voltage fixed switchgear that meets the requirements of temperature rise testing. Background Technology

[0002] The GGD low-voltage fixed switchgear is a type of GGD AC low-voltage distribution cabinet, mainly used in fixed wiring low-voltage power distribution systems. It is suitable for AC 50Hz power distribution systems with a rated operating voltage of 380V and a rated current up to 3150A, and is used for power conversion, distribution and control of power, lighting and power distribution equipment.

[0003] The existing GGD low-voltage fixed switchgear is experiencing problems during temperature rise testing:

[0004] Specifically, the temperature rise of the switch terminals and the operating handle in the low-voltage switchgear's molded case circuit exceeded 70K and 25K respectively during the temperature rise test of the random inspection item, all of which exceeded the basic technical parameter requirements.

[0005] Therefore, in order to solve the problem of excessive temperature rise in existing low-voltage fixed switchgear, a compact low-voltage fixed switchgear that meets the temperature rise test requirements is proposed. Utility Model Content

[0006] The purpose of this invention is to provide a compact low-voltage fixed switchgear that meets the requirements of temperature rise testing, so as to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a compact low-voltage fixed switch cabinet that meets the requirements of temperature rise testing, comprising a cabinet body assembled from C-shaped profiles, upper and lower crossbeams, pressure plates, and support corners;

[0008] And the main busbar installed inside the cabinet;

[0009] The front end of the cabinet is divided into a circuit breaker compartment and a component compartment from top to bottom. The right side of the circuit breaker compartment is set as a metering compartment, and the rear end of the cabinet is set as a busbar compartment.

[0010] The busbar compartment, circuit breaker compartment, metering compartment, and component compartment are all separated and isolated by partitions;

[0011] The main busbar is horizontally installed inside the busbar room, and a molded case switch is installed inside the circuit breaker room.

[0012] Preferably, the cabinet further includes a top plate and a bottom plate, and the top plate and the bottom plate are provided with heat dissipation holes running vertically through the busbar compartment.

[0013] Preferably, a generator car connector box is fixedly installed on the left side of the cabinet, and an upper side plate and a lower side plate are fixedly installed on the left side of the cabinet corresponding to the upper and lower ends of the generator car connector box, respectively.

[0014] Preferably, a component compartment door is provided on the front of the cabinet corresponding to the component compartment position, a circuit breaker compartment door is provided on the front of the cabinet corresponding to the circuit breaker compartment position, and a plastic cover plate is fixedly provided on the back of the circuit breaker compartment door corresponding to the position of the plastic case switch.

[0015] Preferably, a molded case switch mounting beam is provided on the rear side of the molded case switch, and a switch cabinet insulation plate is provided between the surface of the molded case switch and the molded case switch mounting beam. The surface of the switch cabinet insulation plate is connected to the surface of the molded case switch by a snap-fit ​​connection, and the back of the molded case cover plate is adapted to the front of the molded case switch.

[0016] Preferably, the back of the switch cabinet insulation plate is fixedly connected to the molded case switch mounting beam, and the molded case switch mounting beam is fixedly connected to the inner wall of the circuit breaker chamber by bolts.

[0017] Preferably, busbar clamps are arranged sequentially from left to right on the main busbar, and the busbar clamps are fixedly connected to the inner wall of the busbar chamber by self-tapping screws.

[0018] Compared with the prior art, the beneficial effects of this utility model are: this compact low-voltage fixed switchgear meets the temperature rise test requirements.

[0019] 1) By using the gap in the plastic case cover plate before the switch, the contact area with the metal cabinet plate is reduced, which is conducive to heat dissipation on this side. In addition, the installation of the plastic case switch on the mounting beam reduces the reverse heat transfer from the metal cabinet plate, thereby reducing the temperature rise and improving the heat dissipation effect.

[0020] 2) By adopting a frame-jointed cabinet, the splicing strength and rigidity of the entire frame are improved by using C-shaped profiles, upper and lower beams, pressure plates and bracing; the use of vertically installed busbars allows high-temperature airflow to flow freely upward from below and be directly conducted to the outside through the top plate, thus improving the heat dissipation effect of the cabinet. Attached Figure Description

[0021] Figure 1 This is a three-dimensional schematic diagram of the front structure of the cabinet of this utility model;

[0022] Figure 2 This is a schematic cross-sectional view of the front structure of the busbar compartment of this utility model;

[0023] Figure 3 This is a side sectional view of the plastic-cased switch structure of this utility model.

[0024] Figure 4 This is a top view of the top plate structure of this utility model.

[0025] In the diagram: 1 Cabinet, 2 Circuit breaker compartment, 21 Circuit breaker compartment door, 22 Molded case cover, 3 Component compartment, 4 Metering compartment, 5 Component compartment door, 6 Upper side panel, 7 Generator car plug-in box, 8 Lower side panel, 9 Busbar compartment, 91 Main busbar, 92 Busbar clamp, 10 Top plate, 11 Molded case switch, 111 Switch cabinet insulation board, 112 Molded case switch mounting beam, 12 Heat dissipation hole. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Example 1:

[0028] Please see Figures 1-4 This utility model provides a technical solution: a compact low-voltage fixed switch cabinet that meets the requirements of temperature rise testing, including a cabinet body 1 spliced ​​together by C-shaped profiles, upper and lower crossbeams, pressure plates and support corners;

[0029] And the main busbar 91 located inside cabinet 1;

[0030] The front interior of cabinet 1 is divided into circuit breaker compartment 2 and component compartment 3 from top to bottom. The right side of circuit breaker compartment 2 is set as metering compartment 4, and the rear interior of cabinet 1 is set as busbar compartment 9.

[0031] Busbar compartment 9, circuit breaker compartment 2, metering compartment 4, and component compartment 3 are all separated by partitions;

[0032] The main busbar 91 is horizontally installed inside the busbar compartment 9. The circuit breaker compartment 2 is equipped with a molded case switch 11. The left side of the cabinet 1 is fixedly equipped with a generator car plug-in box 7. The upper side plate 6 and the lower side plate 8 are fixedly installed on the upper and lower ends of the left side of the cabinet 1 corresponding to the generator car plug-in box 7, respectively.

[0033] The cabinet 1 also includes a top plate 10 and a bottom plate. The top plate 10 and the bottom plate are provided with heat dissipation holes 12 that are vertically connected to the busbar chamber 9. Busbar clamps 92 are arranged on the main busbar 91 from left to right. The busbar clamps 92 are fixedly connected to the inner wall of the busbar chamber 9 by self-tapping screws.

[0034] Furthermore, in this embodiment, by setting up a three-phase vertical busbar, the high-temperature airflow can flow freely upward from below and be directly conducted to the outside of the cabinet 1 through the top plate 10, while the cold air is replenished from below, forming natural convection, thereby reducing the temperature rise;

[0035] When the busbars are arranged vertically, a "chimney effect" is created, with hot air flowing from bottom to top and cold air replenishing from below. Compared to traditional horizontal installation, this creates stronger natural convection and reduces the temperature rise by 15%.

[0036] Example 2

[0037] Please see Figures 1-4 Furthermore, based on Embodiment 1, the following is obtained: a component compartment door 5 is provided on the front of the cabinet 1 corresponding to the component compartment 3, a circuit breaker compartment door 21 is provided on the front of the cabinet 1 corresponding to the circuit breaker compartment 2, and a plastic cover plate 22 is fixedly provided on the back of the circuit breaker compartment door 21 corresponding to the plastic case switch 11.

[0038] A molded case switch 11 is provided on the rear side of the molded case switch 11. A switch cabinet insulation plate 111 is provided between the surface of the molded case switch 11 and the molded case switch installation beam 112. The surface of the switch cabinet insulation plate 111 is connected to the surface of the molded case switch 11 by a snap-fit. The back of the molded case cover plate 22 is adapted to the front of the molded case switch 11. The back of the switch cabinet insulation plate 111 is fixedly connected to the molded case switch installation beam 112. The molded case switch installation beam 112 is fixedly connected to the inner wall of the circuit breaker compartment 2 by bolts.

[0039] Furthermore, in this embodiment, by utilizing the gap in the plastic case cover plate 22 before the plastic case switch 11 to reduce the contact area with the metal cabinet plate, it is beneficial for heat dissipation on this side, thereby improving the heat dissipation effect and reducing the temperature rise; by using the plastic case switch mounting beam 112 to install the plastic case switch 11, the contact area between the switch and the metal cabinet plate is reduced, thereby also reducing the reverse heat transfer from the metal cabinet plate, and further reducing the temperature rise; and by adding an insulating plate between the circuits, the insulation safety is improved, the arc propagation is suppressed, and the local heat dissipation is optimized.

[0040] In use, the cabinet 1, which is constructed by splicing profiles, utilizes C-shaped profiles, upper and lower crossbeams, pressure plates, and bracing to improve the splicing strength and rigidity of the entire frame. The vertically installed busbars allow high-temperature airflow to flow freely upwards from below, directly conducting heat through the top plate 10 to the outside, thus improving the heat dissipation effect of the cabinet 1. The gap in the plastic case cover plate 22 in front of the plastic case switch 11 reduces the contact area with the metal cabinet plate, which is beneficial for heat dissipation on this side. Furthermore, the installation of the plastic case switch 11 on the mounting beam reduces the reverse heat transfer from the metal cabinet plate, thereby reducing the temperature rise and improving the heat dissipation effect.

[0041] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A compact low-voltage fixed switchgear that meets the requirements of temperature rise test, comprising a cabinet body (1) spliced ​​together from C-shaped profiles, upper and lower crossbeams, pressure plates and bracing; And the main busbar (91) installed inside the cabinet (1); Its features are: The front end of the cabinet (1) is divided into a circuit breaker compartment (2) and a component compartment (3) from top to bottom. The right side of the circuit breaker compartment (2) is set as a metering compartment (4). The rear end of the cabinet (1) is set as a busbar compartment (9). The busbar compartment (9), circuit breaker compartment (2), metering compartment (4) and component compartment (3) are all separated by partitions; The main busbar (91) is horizontally installed inside the busbar compartment (9), and a molded case switch (11) is installed inside the circuit breaker compartment (2).

2. A compact low-voltage fixed switchgear that meets the temperature rise test requirements according to claim 1, characterized in that: The cabinet (1) also includes a top plate (10) and a bottom plate, and the top plate (10) and the bottom plate are provided with heat dissipation holes (12) that run vertically through the busbar compartment (9).

3. A compact low-voltage fixed switchgear that meets the temperature rise test requirements according to claim 1, characterized in that: A generator car plug-in box (7) is fixedly installed on the left side of the cabinet (1), and an upper side plate (6) and a lower side plate (8) are fixedly installed on the upper and lower ends of the left side of the cabinet (1) corresponding to the generator car plug-in box (7).

4. A compact low-voltage fixed switchgear that meets the temperature rise test requirements according to claim 1, characterized in that: The cabinet (1) has a component compartment door (5) on the front corresponding to the component compartment (3), and a circuit breaker compartment door (21) on the front corresponding to the circuit breaker compartment (2). A plastic cover plate (22) is fixedly installed on the back of the circuit breaker compartment door (21) corresponding to the plastic case switch (11).

5. A compact low-voltage fixed switchgear that meets the temperature rise test requirements according to claim 4, characterized in that: A plastic case switch mounting beam (112) is provided on the rear side of the plastic case switch (11). A switch cabinet insulation plate (111) is provided between the surface of the plastic case switch (11) and the plastic case switch mounting beam (112). The surface of the switch cabinet insulation plate (111) is connected to the surface of the plastic case switch (11) by a snap-fit. The back of the plastic case cover plate (22) is adapted to the front of the plastic case switch (11).

6. A compact low-voltage fixed switchgear that meets the temperature rise test requirements according to claim 5, characterized in that: The back of the switch cabinet insulation plate (111) is fixedly connected to the plastic case switch mounting beam (112), and the plastic case switch mounting beam (112) is fixedly connected to the inner wall of the circuit breaker compartment (2) by bolts.

7. A compact low-voltage fixed switchgear that meets the temperature rise test requirements according to claim 1, characterized in that: Busbar clamps (92) are arranged sequentially from left to right on the main busbar (91), and the busbar clamps (92) are fixedly connected to the inner wall of the busbar chamber (9) by self-tapping screws.

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