High-voltage large-current quick breaker

Abstract

The utility model discloses a high-voltage heavy-current quick breaker, which relates to the technical field of breakers and comprises a plurality of bridge arms, the bridge arms are connected in parallel, each bridge arm comprises a plurality of gunpowder breakers, and the gunpowder breakers are connected in series. And the gunpowder breakers with the same potential on the bridge arms are connected with the secondary side of the same pulse transformer through connecting wires, and the primary side of each pulse transformer is connected with an ignition signal receiving wire. According to the utility model, the gunpowder breakers are connected in series to improve the voltage endurance capability after breaking, and the plurality of bridge arms are connected in parallel to improve the rated current-carrying capability, thereby being suitable for a high-voltage and large-current rapid breaking environment, and all the gunpowder breakers are ignited at the same time when the rapid breaking device works. The high-voltage large-current quick breaker solves the problems of action consistency of a plurality of gunpowder breakers and voltage resistance among the breakers, is simple in structure, low in cost, high in reliability and good in consistency, and can be used for high-voltage large-current occasions.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to a high-voltage and high-current fast circuit breaker. Background Art

[0002] Fast-acting fuses are used in DC power distribution systems and have the ability to limit short-circuit current and quickly cut off fault current. With the rapid development of DC power distribution systems, the voltage and current levels of the systems are getting higher and higher, and the requirements for fast-acting fuses are also becoming higher and higher.

[0003] Fast-acting fuses consist of pyrotechnic breakers, arc-extinguishing fuses and arc triggers. Pyrotechnic breakers usually use explosives to break, and the design specifications are voltage below 2000VDC and current below 1500A. Limited by fast-acting breakers, fast-acting fuses are generally used in low-voltage and low-current systems. When the system voltage exceeds 4000V or the current exceeds 3000A, the fast-acting fuse will not be able to meet the system requirements. Utility Model Content

[0004] The purpose of the utility model is to solve the problems in the prior art and to propose a fast breaker that can be used in a high voltage and high current distribution system and is suitable for a distribution system with a voltage of more than 4000V or a rated current of more than 3000A.

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

[0006] A high-voltage and high-current fast breaker, comprising:

[0007] A plurality of bridge arms, each bridge arm is connected in parallel, each bridge arm comprises a plurality of gunpowder breakers, each gunpowder breakers are connected in series;

[0008] Multiple pulse transformers, the powder breakers with the same potential on each bridge arm are connected to the secondary side of the same pulse transformer through a connecting line, and the primary side of each pulse transformer is connected to the ignition signal receiving line;

[0009] After the primary side of each pulse transformer receives the ignition signal, it acts on each gunpowder circuit breaker through the connecting wire, causing each gunpowder circuit breaker to be disconnected at the same time.

[0010] Furthermore, each powder switch is of the same model and specification.

[0011] Furthermore, the difference between the resistances of the bridge arms is less than 5%.

[0012] Furthermore, it also includes two copper bars, and two ends of each bridge arm are respectively connected to the two copper bars.

[0013] Furthermore, a gap is provided between each bridge arm, and the gap value is greater than 10 cm.

[0014] Furthermore, the connecting wires between the pulse transformer and the powder breaker are isolated.

[0015] Furthermore, the connecting wire adopts 0.5mm 2 High-voltage wires are routed separately, with each connecting wire spaced more than 10 cm apart.

[0016] Furthermore, each connecting line has the same length.

[0017] Furthermore, the primary sides of the pulse transformers are connected in series to receive the ignition signal line.

[0018] Furthermore, the powder breaker includes an pyrotechnic device, a breaking grid and a silver sheet. The pulse transformer can ignite the pyrotechnic device to drive the breaking grid to cut off the silver sheet, thereby forming an electrical gap.

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

[0020] The medium-high voltage and high current fast circuit breaker of the utility model is formed by connecting a plurality of pyrotechnic breakers in series to form a bridge arm, and then connecting a plurality of bridge arms in parallel to form a fast circuit breaker. The series connection of pyrotechnic breakers can improve the withstand voltage after breaking, and the parallel connection of a plurality of bridge arms can improve the rated current carrying capacity, so that it is suitable for the fast breaking environment of high voltage and high current. When the fast circuit breaker is working, all the pyrotechnic breakers are ignited at the same time, so as to solve the problem of consistency of the actions of a plurality of pyrotechnic breakers and withstand voltage between the breakers. The high voltage and high current fast circuit breaker has the advantages of simple structure, low cost, high reliability and good consistency, and can be used in high voltage and high current occasions. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a front view structural schematic diagram of a high-voltage and high-current fast breaker proposed by the utility model;

[0022] Figure 2 The present invention is a schematic diagram of the three-dimensional structure of a bridge arm of a high-voltage and high-current fast breaker proposed by the utility model.

[0023] In the figure: 1. Bridge arm; 2. Gunpowder breaker; 3. Copper busbar; 4. Connecting wire; 5. Pulse transformer. DETAILED DESCRIPTION

[0024] The technical solution of this patent is further described in detail below in conjunction with specific implementation methods.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] Reference Figure 1-2 , a high-voltage and high-current fast-breaking device, is used in high-voltage and high-current fast-breaking environments to improve the withstand voltage capability of the breaker after breaking, as well as the rated current-carrying capacity of the breaker.

[0029] The high-voltage and high-current fast breaker comprises a plurality of bridge arms 1, a plurality of pulse transformers 5 and two copper bars 3;

[0030] Each bridge arm 1 includes a plurality of pyrotechnic breakers 2, and the pyrotechnic breakers 2 on each bridge arm 1 are connected in series to improve the withstand voltage after breaking. The pyrotechnic breakers 2 are breakers of the same model and specification. The two ends of each bridge arm 1 are respectively fixedly connected to two copper bars 3, so that the bridge arms 1 are connected in parallel, and the fast breaker can be connected to the circuit through the copper bar 3. The resistance difference of each bridge arm 1 is less than 5% to ensure that the current passing through each bridge arm 1 is similar. A gap is provided between each parallel bridge arm 1, and the gap value is greater than 10 cm. Multiple bridge arms 1 can be connected in parallel to improve the rated current carrying capacity, so that the high-voltage and high-current fast breaker can be used for distribution systems above 4000V or rated current above 3000A.

[0031] The gunpowder breakers 2 with the same potential on each bridge arm 1 are connected to the secondary side of the same pulse transformer 5 through the connecting wire 4. The pulse transformer 5 can act on each gunpowder breaker 2 through the connecting wire 4 to trigger the gunpowder breaker 2. The connecting wire 4 is made of 0.5mm 2 The high-voltage conductors and the connecting wires 4 are isolated from each other, that is, they are routed separately, and the intervals between the connecting wires 4 are greater than 10 cm, and the connecting wires 4 are of equal length, so as to ensure that the breaking time of all the gunpowder breakers 2 is similar.

[0032] The primary side of each pulse transformer 5 is connected in series to receive the ignition signal line. After receiving the ignition signal, the primary side of each pulse transformer 5 acts on each gunpowder disconnector 2 through the connecting line 4, so that each gunpowder disconnector 2 is disconnected at the same time.

[0033] The pyrotechnic breaker 2 adopts the existing pyrotechnic assisted breaker, which mainly includes pyrotechnics, breaking grids and silver sheets. It is driven by the shock wave generated by the explosion of the pyrotechnics. The pyrotechnics explode rapidly to drive the breaking grids, thereby breaking the current-carrying silver sheets, realizing current transfer and electrical gap formation.

[0034] The working principle of the high-voltage and high-current fast-breaking device: multiple powder breakers 2 are connected in series to form a bridge arm 1 to improve the withstand voltage after breaking, and multiple bridge arms 1 are connected in parallel to improve the rated current carrying capacity, so that it is suitable for high-voltage and high-current fast-breaking environments, especially distribution systems above 4000V or rated current above 3000A;

[0035] When the primary side of the pulse transformer 5 receives the ignition signal, each pulse transformer 5 will act on the pyrotechnic switches 2 of the same potential through the equal-length connecting wires 4 to ignite the pyrotechnic products. The pyrotechnic products will explode rapidly to drive the breaking grid and separate the carrier silver plate, so that each pyrotechnic switch 2 is disconnected simultaneously and quickly, ensuring that the breaking time of all pyrotechnic switches 2 is similar, which can meet the high-voltage and high-current fast disconnection occasions.

[0036] 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 high voltage and high current fast breaker, characterized in that: include: A plurality of bridge arms (1), each of the bridge arms (1) being connected in parallel, each of the bridge arms (1) comprising a plurality of gunpowder breakers (2), each of the gunpowder breakers (2) being connected in series; A plurality of pulse transformers (5), the powder breakers (2) with the same potential on each bridge arm (1) are connected to the secondary side of the same pulse transformer (5) via a connecting line (4), and the primary side of each pulse transformer (5) is connected to a line for receiving an ignition signal; After the primary side of each pulse transformer (5) receives the ignition signal, it acts on each gunpowder switch (2) through the connecting line (4), so that each gunpowder switch (2) is disconnected at the same time.

2. A high-voltage and high-current fast breaker according to claim 1, characterized in that: Each of the gunpowder breakers (2) is a breaker of the same model and specification.

3. A high-voltage and high-current fast breaker according to claim 1, characterized in that: The resistance difference between the bridge arms (1) is less than 5%.

4. A high-voltage and high-current fast breaker according to claim 1, characterized in that: It also comprises two copper bars (3), and the two ends of each bridge arm (1) are respectively connected to the two copper bars (3).

5. A high-voltage and high-current fast breaker according to claim 1, characterized in that: A gap is provided between each of the bridge arms (1), and the gap value is greater than 10 cm.

6. A high-voltage and high-current fast breaker according to claim 1, characterized in that: The connecting wires (4) connecting the pulse transformer (5) and the powder switch (2) are isolated from each other.

7. A high-voltage and high-current fast breaker according to claim 6, characterized in that: The connecting wire (4) is 0.5 mm 2 The high-voltage wires are routed separately, and the interval between each of the connecting wires (4) is greater than 10 cm.

8. A high-voltage and high-current fast breaker according to claim 1, characterized in that: Each of the connecting lines (4) is of equal length.

9. A high-voltage and high-current fast breaker according to claim 1, characterized in that: The primary sides of the pulse transformers (5) are connected in series to receive an ignition signal line.

10. A high-voltage and high-current fast breaker according to claim 1, characterized in that: The pyrotechnic device (2) comprises an initiating device, an initiating grid and a silver sheet, and the pulse transformer (5) can ignite the initiating device to drive the initiating grid to cut off the silver sheet, thereby forming an electrical gap.

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