Direct-current current-limiting fuse

Abstract

The utility model discloses a DC current-limiting fuse, which relates to the technical field of fuses and comprises a plurality of cut-off assemblies, each cut-off assembly comprises a plurality of cut-off units and a plurality of ignition devices, the cut-off units in each cut-off assembly are connected in series, and each ignition device is connected with each cut-off unit and can control each cut-off unit to be cut off; the on-off units of the on-off assemblies are connected in series or in parallel. Each ignition device comprises an electric control detection ignition assembly and a trigger ignition assembly. According to the utility model, the breakers and the arc extinguishers are used as units, and the units are connected in series and in parallel, so that the DC current-limiting fuse meets working environments with different voltage grades and breaking capacities, and a dual-detection and cross-triggering mode is adopted, thereby ensuring that explosives in a plurality of breakers can be stably and synchronously triggered. And finally, the breaking capacity of the direct-current current-limiting fuse is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of fuses, in particular to a DC current limiting fuse. Background Art

[0002] DC current limiting fuse protection equipment can effectively solve the problem of increasing short-circuit capacity in power systems. In recent years, DC current limiting fuses have been extensively researched and developed, such as "superconducting current limiters, hybrid current limiting fuses" and other topological solutions. Usually, DC current limiting fuses are mainly composed of three parts: short-circuit detection unit, breaker, and arc extinguisher. When the DC current limiting fuse works normally, the current mainly flows through the high-speed breaker. When a short circuit occurs, the short-circuit detection unit quickly detects the short-circuit fault through the current sensor and immediately sends an action signal, causing the breaker to operate, thereby forming a break, transferring the short-circuit current to the arc extinguisher, and completing the current limiting breaking action.

[0003] Existing DC current limiting fuses are designed based on the actual needs to meet the working conditions of the "breakers and arc-extinguishing fuses". If the breaking capacity needs to be improved during this process, it is necessary to redesign and test and verify, and the designed "breakers and arc-extinguishing fuses" are large in size. Fuses of different voltage levels need to be designed and tested repeatedly, which wastes manpower costs and test resources. Utility Model Content

[0004] The utility model aims to solve the problems in the prior art and proposes a DC current limiting fuse which can adapt to different voltage levels to achieve different breaking capacities.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A DC current limiting fuse, comprising:

[0007] Multiple disconnecting assemblies, each disconnecting assembly includes multiple disconnecting units and multiple ignition devices, each disconnecting unit in each disconnecting assembly is connected in series, each ignition device is connected to each disconnecting unit and can control each disconnecting unit to disconnect;

[0008] The breaking units of each breaking assembly are connected in series or in parallel;

[0009] Each ignition device includes an electronically controlled detection ignition component and a trigger ignition component. Any breaking unit in the breaking component can be controlled to break by the electronically controlled detection ignition component or the trigger ignition component of any ignition device in the breaking component.

[0010] Furthermore, a gap is provided between each breaking assembly, and a gap is provided between each breaking unit of each breaking assembly.

[0011] Furthermore, each breaking unit includes a breaker and an arc extinguisher, the breaker and the arc extinguisher are connected in parallel, and the ignition device can act on the breaker to cause it to break.

[0012] Furthermore, the breaker is a gunpowder breaker, which includes a breaker housing, a pyrotechnic, a breaking grid and a breaker silver sheet. The pyrotechnic, the breaking grid and the breaker silver sheet are arranged in sequence from top to bottom inside the breaker housing. The ignition device can ignite the pyrotechnic to cause it to explode, thereby driving the breaking grid to move downward and disconnecting the breaker silver sheet.

[0013] Furthermore, the powder breaker also includes a flexible component and a stainless steel gasket, the flexible component is arranged below the silver plate of the breaker, and the stainless steel gasket is arranged between the pyrotechnic product and the breaking grid.

[0014] Furthermore, the arc extinguisher includes an arc extinguisher housing, two connecting covers, two connecting terminals and an arc extinguisher silver sheet. The two connecting covers are respectively fixedly connected to the two ends of the arc extinguisher housing, each connecting terminal is arranged in the middle of a connecting cover, the arc extinguisher silver sheet is inside the arc extinguisher housing, and the two ends of the arc extinguisher silver sheet are respectively connected to the two connecting terminals, and the arc extinguisher silver sheet is connected in parallel with the breaker through the two connecting terminals.

[0015] Furthermore, the arc extinguisher shell is cylindrical, and quartz sand is arranged inside the shell, and the quartz sand wraps the outside of the arc extinguisher silver sheet.

[0016] Furthermore, the electronically controlled detection ignition component includes a short-circuit detection unit and a pulse transformer. When the short-circuit detection unit detects that the current exceeds a threshold value, it sends an action signal, which acts on the breaker through the pulse transformer.

[0017] Furthermore, the trigger ignition assembly includes an arc trigger, which melts when the current exceeds a threshold value, triggering an arc to act on the breaker.

[0018] Furthermore, each breaking assembly is provided with two breaking units and two ignition devices, and each ignition device can act on two breaking units simultaneously.

[0019] The beneficial effects of the utility model are:

[0020] The DC current limiting fuse in the utility model uses a breaker and an arc extinguisher as units, and the units are freely combined, that is, the units are connected in series and in parallel, so that the DC current limiting fuse can meet the working environment of different voltage levels and breaking capacities. On the one hand, the DC current limiting fuse can be modularized, which is convenient for product assembly and test verification. On the other hand, it can also save labor costs and test resources, and can make the DC current limiting fuse products serialized and modularized.

[0021] The DC current limiting fuse adopts a dual ignition method of electronically controlled ignition and trigger self-triggering ignition for the explosive in the same breaker in the series-parallel structure, and one ignition device can act on two breakers to form cross-triggering ignition, that is, a double detection and cross-triggering method is adopted to ensure that the explosives in multiple breakers in the series-parallel structure can be stably and synchronously triggered, ultimately improving the breaking capacity of the DC current limiting fuse. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the series structure of a DC current limiting fuse proposed by the utility model;

[0023] Figure 2 A schematic diagram of the parallel structure of a DC current limiting fuse proposed by the utility model;

[0024] Figure 3 A cross-sectional view of the structure of a powder breaker of a DC current limiting fuse proposed by the utility model;

[0025] Figure 4 The utility model provides a schematic diagram of the arc extinguisher structure of a DC current limiting fuse.

[0026] In the figure: 1 breaking assembly, 11 breaking unit, 111 breaker, 1111 breaker housing, 1112 pyrotechnics, 1113 breaking grid, 1114 breaker silver sheet, 1115 flexible assembly, 1116 stainless steel gasket, 112 arc extinguisher, 1121 arc extinguisher housing, 1122 connection cover, 1123 connection terminal, 12 ignition device. DETAILED DESCRIPTION

[0027] The technical solution of this patent is further described in detail below in conjunction with specific implementation methods.

[0028] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0029] In the description of this patent, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing this patent and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this patent.

[0030] In the description of this patent, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be fixedly connected or set, or it can be detachably connected or set, or connected or set in one piece. For ordinary technicians in this field, the specific meanings of the above terms in this patent can be understood according to specific circumstances.

[0031] Reference Figure 1-4 , a DC current limiting fuse, is used in power systems to adapt to different voltage levels and to achieve different breaking capacities.

[0032] The DC current limiting fuse comprises a plurality of breaking components 1, each breaking component 1 comprises two breaking units 11 and two ignition devices 12, each breaking unit 11 in each breaking component 1 is connected in series, each ignition device 12 is connected to the two breaking units 11 and can control the two breaking units 11 to break at the same time, the breaking units 11 of each breaking component 1 are connected in series or in parallel, and the series-parallel method enables the DC current limiting fuse to meet the working environment of different voltage levels and breaking capacities, on the one hand, it can make the DC current limiting fuse modular, and facilitate the assembly and test verification of the product, on the other hand, it can also save labor costs and test resources, and can make the DC current limiting fuse products serialized and modularized. When installing the equipment, it is necessary to reserve gaps between the breaking components 1, and it is also necessary to reserve gaps between the breaking units 11 of each breaking component 1 to improve the insulation capacity.

[0033] Each breaking unit 11 includes a breaker 111 and an arc extinguisher 112. The breaker 111 is a pyrotechnic breaker, which includes a breaker housing 1111, a pyrotechnic product 1112, a breaking grid 1113, a breaker silver sheet 1114, a flexible component 1115 and a stainless steel gasket 1116. The pyrotechnic product 1112, the breaking grid 1113 and the breaker silver sheet 1114 are sequentially arranged inside the breaker housing 1111 from top to bottom. The flexible component 1115 is arranged below the breaker silver sheet 1114. The stainless steel gasket 1116 is arranged between the pyrotechnic product 1112 and the breaking grid 1113. The arc extinguisher 112 includes a cylindrical arc extinguisher housing 1121, two connecting covers 1122, two connecting terminals 1123 and an arc extinguisher silver sheet. The two connecting covers 1122 are respectively fixedly connected to the arc extinguisher housing 1111. Connected to the two ends of the arc extinguisher housing 1121, each connecting terminal 1123 is arranged in the middle of a connecting cover 1122, the arc extinguisher silver sheet is inside the arc extinguisher housing 1121, and the two ends of the arc extinguisher silver sheet are respectively connected to the two connecting terminals 1123, the arc extinguisher silver sheet is connected in parallel with the breaker 111 through the two connecting terminals 1123, the ignition device 12 can ignite the pyrotechnics 1112 to make it explode, thereby driving the breaking grid 1113 to move downward and disconnect the breaker silver sheet 1114. Since the breaker 111 and the arc extinguisher 112 are connected in parallel, the short-circuit current will be transferred to the arc extinguisher 112, the arc extinguisher silver sheet will quickly melt and cut off the current, since quartz sand is provided inside the arc extinguisher 112, the quartz sand is wrapped around the outside of the arc extinguisher silver sheet, when the arc extinguisher silver sheet melts, the arc will be quickly cut off.

[0034] Each ignition device 12 includes an electronically controlled detection ignition component and a trigger ignition component. The electronically controlled detection ignition component includes a short-circuit detection unit and a pulse transformer. When the short-circuit detection unit detects that the current exceeds the threshold value, it sends out an action signal, which acts on the breaker 111 through the pulse transformer. The trigger ignition component includes an arc trigger. The arc trigger melts when the current exceeds the threshold value, and the trigger arc acts on the breaker 111. The electronically controlled detection ignition component and the trigger ignition component in any ignition device 12 in each breaking component 1 can control the breaking of each breaking unit 11 in the breaking component 1. Each breaking unit 11 is controlled to break by the electronically controlled detection ignition component and the trigger ignition component, thereby forming a double detection cross-triggering effect, ensuring that the explosives in multiple breakers 111 in the series-parallel structure can be stably and synchronously triggered, and ultimately improving the breaking capacity of the DC current limiting fuse.

[0035] The working principle of the DC current limiting fuse:

[0036] According to the voltage parameters in the power system, the appropriate number of breaking components 1 is selected, and the breaking units 11 of each breaking component 1 are connected in series or in parallel. The series-parallel method enables the DC current limiting fuse to meet the working environment of different voltage levels and breaking capacities. On the one hand, it can make the DC current limiting fuse modular, which is convenient for product assembly and test verification. On the other hand, it can also save labor costs and test resources, and can make the DC current limiting fuse products serialized and modularized.

[0037] When the circuit fails and short-circuits, the rated current flows through the breaker 111. The short-circuit detection unit in the electronically controlled detection ignition component detects that the current exceeds the threshold value and sends out an action signal, which acts on the gunpowder breaker 111 through the pulse transformer, ignites the pyrotechnics 1112, and causes it to explode, thereby driving the breaker grid 1113 to move downward and disconnect the breaker silver plate 1114. Since the breaker 111 and the arc extinguisher 112 are connected in parallel, the short-circuit current will be transferred to the arc extinguisher 112, and the arc extinguisher silver plate will quickly melt and cut off the current. If the electronically controlled detection ignition component fails, the short-circuit current will pass through the arc trigger of the trigger ignition component, and the arc trigger will be The fuse is a conductive component with a narrow neck. When a short circuit occurs, the fuse quickly melts under the action of the short-circuit current to generate an arc. The arc voltage is used to detonate the pyrotechnics 1112 in the gunpowder breaker 111 to cut off the circuit. Since the electronically controlled ignition component and the trigger ignition component in each ignition device 12 control a breaking unit 11 to break together, a double detection and double triggering effect can be formed, and one ignition device 12 can act on two breakers 111 at the same time to form a cross-trigger ignition, ensuring that the explosives in multiple breakers 111 in the series-parallel structure can be stably and synchronously triggered, ultimately improving the breaking capacity of the DC current limiting fuse.

[0038] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A DC current limiting fuse, characterized in that: include: A plurality of disconnecting assemblies (1), each of the disconnecting assemblies (1) comprising a plurality of disconnecting units (11) and a plurality of ignition devices (12), the disconnecting units (11) in each of the disconnecting assemblies (1) being connected in series, and each of the ignition devices (12) being connected to each of the disconnecting units (11) and being capable of controlling each of the disconnecting units (11) to disconnect; The breaking units (11) of the breaking assemblies (1) are connected in series or in parallel; Each of the ignition devices (12) comprises an electronically controlled detection ignition component and a trigger ignition component, and any one of the disconnection units (11) in the disconnection component (1) can be controlled to disconnect by the electronically controlled detection ignition component or the trigger ignition component of any one of the ignition devices (12) in the disconnection component (1).

2. A DC current limiting fuse according to claim 1, characterized in that: Gaps are provided between the respective breaking assemblies (1), and gaps are provided between the respective breaking units (11) of each breaking assembly (1).

3. A DC current limiting fuse according to claim 1, characterized in that: Each of the breaking units (11) comprises a breaker (111) and an arc extinguisher (112); the breaker (111) and the arc extinguisher (112) are connected in parallel; and the ignition device (12) can act on the breaker (111) to cause it to break.

4. A DC current limiting fuse according to claim 3, characterized in that: The breaker (111) is a pyrotechnic breaker, comprising a breaker housing (1111), an pyrotechnic product (1112), a breaker grid (1113) and a breaker silver plate (1114); the pyrotechnic product (1112), the breaker grid (1113) and the breaker silver plate (1114) are sequentially arranged inside the breaker housing (1111) from top to bottom; the ignition device (12) can ignite the pyrotechnic product (1112) to cause it to explode, thereby driving the breaker grid (1113) to move downward and disconnecting the breaker silver plate (1114).

5. A DC current limiting fuse according to claim 4, characterized in that: The pyrotechnic breaker also includes a flexible component (1115) and a stainless steel gasket (1116), wherein the flexible component (1115) is arranged below the breaker silver plate (1114), and the stainless steel gasket (1116) is arranged between the pyrotechnic product (1112) and the breaking grid plate (1113).

6. A DC current limiting fuse according to claim 3, characterized in that: The arc extinguisher (112) comprises an arc extinguisher housing (1121), two connection covers (1122), two connection terminals (1123) and an arc extinguisher silver sheet. The two connection covers (1122) are respectively fixedly connected to the two ends of the arc extinguisher housing (1121), each connection terminal (1123) is arranged in the middle of one of the connection covers (1122), the arc extinguisher silver sheet is inside the arc extinguisher housing (1121), and the two ends of the arc extinguisher silver sheet are respectively connected to the two connection terminals (1123), and the arc extinguisher silver sheet is connected in parallel with the breaker (111) through the two connection terminals (1123).

7. A DC current limiting fuse according to claim 6, characterized in that: The arc extinguisher housing (1121) is cylindrical, and quartz sand is arranged inside the housing, and the quartz sand wraps the outside of the arc extinguisher silver sheet.

8. A DC current limiting fuse according to claim 3, characterized in that: The electronically controlled detection ignition component comprises a short-circuit detection unit and a pulse transformer. When the short-circuit detection unit detects that the current exceeds a threshold value, an action signal is sent out, which acts on the breaker (111) via the pulse transformer.

9. A DC current limiting fuse according to claim 3, characterized in that: The trigger ignition assembly comprises an arc trigger, which melts when the current exceeds a threshold value, triggering an arc to act on the breaker (111).

10. A DC current limiting fuse according to claim 1, characterized in that: Each of the breaking components (1) is provided with two breaking units (11) and two ignition devices (12), and each of the ignition devices (12) can act on the two breaking units (11) at the same time.

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