Low-voltage quick breaker applied to energy storage industry

Abstract

The utility model relates to a low-voltage fast breaker applied to the energy storage industry, which comprises a base plate, an electric cabinet, a low-voltage direct-current fast fuse, bus copper bars, supporting insulators and a low-voltage fast breaker, the bus copper bars are oppositely arranged, and the bottom sides of the two groups of bus copper bars are fixed on the top surface of the base plate through the supporting insulators. The low-voltage direct-current quick fuse and the low-voltage quick breaker are arranged in parallel up and down, and two sides of the low-voltage direct-current quick fuse and two sides of the low-voltage quick breaker are respectively connected with the two groups of bus copper bars. According to the utility model, the setting of the fusing mechanism of the energy storage system is optimized, the traditional fuse structure is changed, a fuse combination structure with timely fusing is designed, the problem that the service lives of other parts are damaged can be reduced, the linkage influence of connected equipment is protected, and the combined type novel fuse is fixed on the platform, so that the service life of the combined type novel fuse is prolonged. And the device is more convenient to transport and install and suitable for popularization and application.

Description

Technical Field

[0001] The utility model relates to the field of energy storage industry, in particular to a low-voltage fast disconnect device used in the energy storage industry. Background Art

[0002] At present, the fault current in the energy storage system is often large because of the need to superimpose the use of a single PACK package. In the current large-scale integrated energy storage cabinet, in the energy storage converter PCS, fuses are needed to protect the important components of the converter IGBT. Because IGBT is a semiconductor, the overcurrent protection element in the current conventional design structure needs to be quickly blown, and the blowing speed of the fuse is much higher than that of the circuit breaker, so the fuse is more suitable in this position. At the same time, the PCS in the energy storage system belongs to the outlet end of the energy storage cabinet, in which multiple battery clusters are connected in parallel, and the battery clusters will be connected in series with multiple packs. Once an electrical fault or fire occurs, the fault current of a single pack will be superimposed, and the fault current will reach about 150kA-250kA. Because of the fast melting speed and the large demand for the maximum melting breaking current, fuses have been used instead of circuit breakers to achieve overcurrent protection at this location. In current use, the following problems have emerged: the daily current of this part is 2300A, and after adding factors that affect overcurrent such as operating temperature and altitude, and adding a certain correction multiple, it is more appropriate to choose a 3000-3500A fuse. However, during use, the energy storage system often has IGBT burnout but the fuse has not blown, resulting in the fuse's protection function not being realized here. For example, the current fuse cannot meet the time required to blow within 10ms for a 150kA fault current. If the selection is reduced, the fuse will also blow prematurely due to excessive temperature rise and inability to dissipate heat. Therefore, overcurrent protection at this location is currently a technical problem. For this reason, a low-voltage fast breaker for the energy storage industry is designed. Utility Model Content

[0003] The purpose of this utility model is to provide a low-voltage fast disconnect device used in the energy storage industry to solve the above technical problems. To achieve the above purpose, this utility model adopts the following technical solutions:

[0004] A low-voltage fast disconnector used in the energy storage industry comprises a base plate, an electric control box, a low-voltage direct current fast fuse, a busbar copper bar, a supporting insulator, and a low-voltage fast disconnector. The busbar copper bar is provided with two groups, and the two groups of busbar copper bars are arranged oppositely. The bottom sides of the two groups of busbar copper bars are fixed to the two ends of the top surface of the base plate through supporting insulators. The electric control box is fixed to one side of the top surface of the base plate through supporting insulators. The low-voltage fast disconnector is arranged between the two groups of busbar copper bars, and the two sides of the low-voltage fast disconnector are respectively connected to the two groups of busbar copper bars. The low-voltage direct current fast fuse is arranged on the top side of the low-voltage fast disconnector, and the two ends of the low-voltage direct current fast fuse are respectively connected to the two groups of busbar copper bars.

[0005] On the basis of the above technical solution, a DC Hall sensor is arranged on the busbar copper busbar, and the DC Hall sensor is connected to the electric control box through an electric control signal line. The two sides of the low-voltage fast disconnector are respectively connected to the busbar copper busbars on both sides through straight guide plates, and the low-voltage fast disconnector and the low-voltage DC fast fuse are both connected to the electric control box through electric control signal lines.

[0006] On the basis of the above technical scheme, the low-voltage DC fast fuse consists of a fuse body, a side support arm foot, and a suspended support arm foot. The suspended support arm foot is symmetrically connected on both sides of the fuse body, and the side support arm foot is symmetrically arranged on both sides of the fuse body, and the fuse body and the side support arm foot are connected through the suspended support arm foot, and the bottom sides of the two ends of the side support arm feet on both sides are fixedly connected to the busbar copper bars on both sides by fixing bolts.

[0007] Compared with the prior art, the utility model has the following advantages: the utility model optimizes the setting of the fusing mechanism of the energy storage system, changes the traditional fuse structure, and designs a fuse combination structure with timely fusing, which can reduce the problem of endangering the service life of other components and protect the chain effect of the connected equipment. The new combined fuse is designed to be fixed on the same platform, which is more convenient in transportation and installation and is suitable for popularization and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a diagram of the overall appearance of the utility model.

[0009] Figure 2 It is a schematic diagram of the structural disassembly of the utility model.

[0010] Figure 3 This is a schematic diagram of the connection between the low-voltage fast disconnector and the busbar copper bar of the utility model.

[0011] Figure 4 This is a schematic diagram of a low-voltage DC fast fuse of the utility model.

[0012] In the figure: base plate 1, electric control box 2, low-voltage DC fast fuse 3, busbar copper bar 4, supporting insulator 5, low-voltage fast disconnector 6, DC Hall sensor 7, electric control signal line 8, straight guide plate 9, fuse body 10, side support arm foot 11, suspended support arm foot 12. DETAILED DESCRIPTION

[0013] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementations.

[0014] A low-voltage fast disconnector used in the energy storage industry comprises a base plate 1, an electric control box 2, a low-voltage direct current fast fuse 3, a busbar copper bar 4, a supporting insulator 5, and a low-voltage fast disconnector 6. The busbar copper bar 4 is provided with two groups, and the two groups of busbar copper bars 4 are arranged oppositely. The bottom sides of the two groups of busbar copper bars 4 are fixed to the two ends of the top surface of the base plate 1 through the supporting insulator 5. The electric control box 2 is fixed to one side of the top surface of the base plate 1 through the supporting insulator 5. The low-voltage fast disconnector 6 is arranged between the two groups of busbar copper bars 4, and the two sides of the low-voltage fast disconnector 6 are respectively connected to the two groups of busbar copper bars 4. The low-voltage direct current fast fuse 3 is arranged on the top side of the low-voltage fast disconnector 6, and the two ends of the low-voltage direct current fast fuse 3 are respectively connected to the two groups of busbar copper bars 4.

[0015] A DC Hall sensor 7 is provided on the busbar copper bar 4, and the DC Hall sensor 7 is connected to the electric control box 2 through an electric control signal line 8. The two sides of the low-voltage fast disconnector 6 are respectively connected to the busbar copper bar 4 on both sides through straight guide plates 9. The low-voltage fast disconnector 6 and the low-voltage DC fast fuse 3 are both connected to the electric control box 2 through the electric control signal line 8.

[0016] The low-voltage DC fast fuse 3 is composed of a fuse body 10, a side support arm foot 11, and a suspended support arm foot 12. The suspended support arm foot 12 is symmetrically connected on both sides of the fuse body 10, and the side support arm foot 11 is symmetrically arranged on both sides of the fuse body 10, and the fuse body 10 and the side support arm foot 11 are connected through the suspended support arm foot 12, and the bottom sides of the two ends of the side support arm feet 11 on both sides are fixedly connected to the busbar copper bar 4 on both sides by fixing bolts.

[0017] Working principle of the utility model: during the operation of the product, after the short-circuit current is detected by the DC Hall sensor 7, a cut-off signal can be sent to the low-voltage fast disconnector 6. The cut-off device of the low-voltage fast disconnector 6 quickly cuts off the busbar copper bar 4, forming an arc that reaches the low-voltage DC fast fuse 3 at the upper end, and quickly blows in the low-voltage DC fast fuse 3. Because the rated current of the low-voltage DC fast fuse 3 is much smaller than the operating current, the blowing speed is also much faster than that of a fast fuse with a larger current. The blowing speed of the low-voltage energy storage fast disconnector is much smaller than the breaking speed of a traditional fuse, and in this way, the current can be quickly cut off to protect the IGBT and other components behind.

[0018] The specific process is that when a short-circuit current passes through, the DC Hall sensor 7 of the low-voltage fast disconnect 6 can sense in advance that the short-circuit current is transmitted to the electric control box 2. The electric control box 2 mainly includes a high-speed single-chip microcomputer controller. The electric control box 2 determines whether to cut off the line through current fluctuations. If the line is judged to be cut off, the signal is transmitted to the low-voltage fast disconnect 6. In the low-voltage fast disconnect 6, by receiving the signal in the electric control box 2, the line is cut off by instantaneous melting. When the circuit is cut off, the transfer current is transferred to the low-voltage DC fast fuse 3, and the low-voltage DC fast fuse 3 quickly melts and extinguishes the arc, thereby playing the arc extinguishing role of the entire device.

[0019] Because the rated current of the upper fuse core is much smaller than the rated current of the normally assembled fuse, the melting speed will be much faster than that of the traditional fast fuse at this position, so that the product can be melted in advance, thereby preventing damage to the product due to arc extinguishing and other problems. In order to avoid short-circuit faults to the ground, a support insulator 5 is added to the overall equipment to meet the insulation requirements to the ground, and a base plate 1 is provided to ensure the stability of the overall device. The side support arm foot 11 and the suspended support arm foot 12 can isolate the low-voltage fast disconnector 6 and the low-voltage DC fast fuse 3 by a large distance to avoid interference caused by each other during the working process.

[0020] The above is a preferred embodiment of the present invention. For ordinary technicians in this field, according to the teachings of the present invention, without departing from the principles and spirit of the present invention, changes, modifications, substitutions and variations made to the implementation methods are still within the scope of protection of the present invention.

Claims

1. A low voltage fast breaker used in the energy storage industry, characterized in that: The invention comprises a base plate (1), an electric control box (2), a low-voltage direct current fast fuse (3), a busbar copper bar (4), a supporting insulator (5), and a low-voltage fast disconnector (6). The busbar copper bar (4) is provided with two groups, and the two groups of busbar copper bars (4) are arranged opposite to each other. The bottom sides of the two groups of busbar copper bars (4) are fixed to the two ends of the top surface of the base plate (1) through the supporting insulator (5). The electric control box (2) is fixed to one side of the top surface of the base plate (1) through the supporting insulator (5). The low-voltage fast disconnector (6) is arranged between the two groups of busbar copper bars (4), and the two sides of the low-voltage fast disconnector (6) are respectively connected to the two groups of busbar copper bars (4). The low-voltage direct current fast fuse (3) is arranged on the top side of the low-voltage fast disconnector (6), and the two ends of the low-voltage direct current fast fuse (3) are respectively connected to the two groups of busbar copper bars (4).

2. A low voltage fast disconnect device used in the energy storage industry according to claim 1, characterized in that: The busbar copper bar (4) is provided with a DC Hall sensor (7), the DC Hall sensor (7) is connected to the electric control box (2) via an electric control signal line (8), both sides of the low-voltage fast disconnector (6) are respectively connected to the busbar copper bars (4) via straight guide plates (9), and both the low-voltage fast disconnector (6) and the low-voltage DC fast fuse (3) are connected to the electric control box (2) via the electric control signal line (8).

3. A low voltage fast breaker used in the energy storage industry according to claim 2, characterized in that: The low-voltage DC fast fuse (3) is composed of a fuse body (10), a side support arm foot (11), and a suspended support arm foot (12); the suspended support arm foot (12) is symmetrically connected to the two sides of the fuse body (10); the side support arm foot (11) is symmetrically arranged on the two sides of the fuse body (10); the fuse body (10) and the side support arm foot (11) are connected via the suspended support arm foot (12); and the bottom sides of both ends of the side support arm feet (11) on both sides are fixedly connected to the busbar copper bars (4) on both sides via fixing bolts.

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