A disconnecting conductor and high voltage line short circuit protection device

Abstract

The utility model provides a kind of conductor and high voltage line short circuit protection device, it is related to circuit protection equipment, conductor includes straight plate shape through-flow conductor, the middle part of the through-flow conductor is equipped with the breaking section of reduced width, the breaking section includes a plurality of sequentially connected narrow diameter parts, each the narrow diameter part includes center fixed block, and the easily removable block connected with the both ends of the center fixed block, the both ends of the easily removable block are relatively recessed to form groove.The utility model has the beneficial effects that: when each narrow diameter part is simultaneously cut off in short circuit, the two easily removable blocks of each narrow diameter part both ends are cut off, arc will be generated at the cut-off position of each easily removable block, form arc voltage, since each narrow diameter part is sequentially connected, arc voltage will also be sequentially connected, when the overall arc voltage after connection exceeds the power voltage in high voltage line, the current in high voltage line rapidly decreases, thereby effectively improve the response speed of high voltage line short circuit protection device, and timely protect circuit.

Description

Technical Field

[0001] This utility model relates to the field of circuit protection equipment technology, and in particular to a conductor breaking and high-voltage line short-circuit protection device. Background Technology

[0002] Fuses and circuit breakers, as typical short-circuit protection devices, are usually installed in the high-voltage main circuit of a power system. Their main function is to automatically cut off the current path when a severe overload or short-circuit fault occurs in the high-voltage main circuit, thereby protecting the high-voltage main circuit. However, when the operating voltage of the high-voltage main circuit reaches or exceeds 2000V, the breaking units of existing protective devices such as fuses and circuit breakers (e.g., the fuse element of the fuse or the contact system of the circuit breaker) will generate a high-energy arc after breaking. This type of arc has a continuous burning characteristic and is difficult to extinguish effectively after breaking. This phenomenon causes the current in the breaking path to not decay to zero quickly, significantly prolonging the fault response time of the protection device. Ultimately, the sluggish current breaking process can easily damage the core electrical equipment on the high-voltage main circuit. Utility Model Content

[0003] In view of this, in order to solve the problem of slow response speed of existing short circuit protection devices when short circuit occurs in high voltage main circuit, the present invention provides a short circuit protection device for conductor interruption and high voltage line.

[0004] An embodiment of this utility model provides a breaking conductor, applied to a short-circuit protection device for high-voltage lines, comprising a straight plate-shaped current-carrying conductor, wherein the current-carrying conductor has a breaking section with a reduced width in the middle, the breaking section comprising a plurality of narrow sections connected in sequence, each of the narrow sections comprising a central fixing block and an easily cuttable block connected to both ends of the central fixing block, wherein the two ends of the easily cuttable block are recessed to form a groove.

[0005] Furthermore, each of the narrow sections also includes two edge fixing blocks, with one end of each of the two easily cuttable blocks away from the central fixing block respectively connected to the two edge fixing blocks.

[0006] Furthermore, the easily cuttable block is hexagonal prism-shaped, with grooves formed on both the upper and lower surfaces at both ends of the easily cuttable block.

[0007] Furthermore, the central fixing block is provided with a first mounting hole.

[0008] Furthermore, the upper or lower surface of the central fixing block is provided with a limiting groove.

[0009] Furthermore, the easily cuttable block has a deformation-adaptive hole in its middle section.

[0010] Furthermore, the number of the narrow sections is two.

[0011] Furthermore, this utility model provides a high-voltage line short-circuit protection device, including the aforementioned breaking conductor, and further including an insulating shell, multiple breaking grid plates, multiple gas generating devices, and a trigger; the current-carrying conductor traverses the insulating shell, so that the breaking section is located inside the insulating shell; each of the central fixing blocks is fixedly installed inside the insulating shell; an arc-extinguishing chamber is provided below each of the easily cuttable blocks inside the insulating shell; each of the breaking grid plates is vertically movable inside the insulating shell, each of the breaking grid plates has two cutting blades, and each of the breaking grid plates is located above a narrow diameter portion. The two cutters are respectively aligned vertically with the two easily cuttable blocks of the narrow section; each gas generator is disposed above and connected to the breaking grid; the trigger is connected to each gas generator and is used to detect the current flowing through the current-carrying conductor. When the current is overloaded, the trigger sends a trigger signal to each gas generator, causing each gas generator to start and push the breaking grid downward. The two cutters of each breaking grid cut the two easily cuttable blocks of the narrow section, thereby cutting off the current on the current-carrying conductor.

[0012] Furthermore, the insulating shell is provided with multiple support seats, each of the central fixing blocks is fixedly supported on one of the support seats, and the arc extinguishing chambers are provided on both sides of the support seats.

[0013] Furthermore, the lower end of the cutter is provided with a slit that is adapted to the shape of the upper part of the easy-to-cut block, so that both ends of the easy-to-cut block can be cut off.

[0014] The beneficial effects of the technical solution provided by the embodiments of this utility model are as follows: When the conductor breaking device of this utility model is applied to the high-voltage line short-circuit protection device, when each narrow section is cut off simultaneously during a short circuit, the two easily cuttable blocks at both ends of each narrow section are cut off, and an electric arc is generated at the location where each easily cuttable block is cut off, forming an arc voltage. Since each narrow section is connected in series, the arc voltage is also connected in series. When the overall arc voltage after series connection exceeds the power supply voltage in the high-voltage line, the current in the high-voltage line is rapidly reduced, thereby effectively improving the response speed of the high-voltage line short-circuit protection device and protecting the circuit in a timely manner. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a conductor interruption method according to this utility model;

[0016] Figure 2 yes Figure 1 Enlarged view of a portion of point A in the middle;

[0017] Figure 3 This is a schematic diagram of a high-voltage line short-circuit protection device according to this utility model;

[0018] Figure 4 This is a cross-sectional view of a high-voltage line short-circuit protection device in a non-triggered state according to this utility model.

[0019] Figure 5 yes Figure 4 A magnified view of a section at point A in the middle;

[0020] Figure 6 This is a cross-sectional view of the trigger state of a high-voltage line short-circuit protection device according to this utility model.

[0021] In the diagram: 100, interrupting conductor; 1, current-carrying conductor; 2, narrow section; 3, central fixing block; 4, easily cuttable block; 5, groove; 6, edge fixing block; 7, limiting groove; 8, first mounting hole; 9, second mounting hole; 10, adaptable deformation hole; 101, insulating shell; 102, upper shell; 103, lower shell; 104, interrupting grid plate; 105, gas generating device; 106, trigger; 107, cutter; 108, arc extinguishing chamber; 109, notch; 110, bolt. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be further described below with reference to the accompanying drawings. The following description presents a preferred embodiment of several possible embodiments of this utility model, intended to provide a basic understanding of the utility model, but not intended to identify the key or decisive elements of the utility model or to limit the scope of protection sought.

[0023] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0024] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0025] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures. Also, it should be understood that, for ease of description, the dimensions of the various parts shown in the figures are not drawn to actual scale.

[0026] In the description of this utility model, it should be noted that the circuits, electronic components and modules involved in this utility model are all existing technologies, which can be fully implemented by those skilled in the art, and need not be elaborated upon.

[0027] It should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] Please refer to Figure 1 and 2 An embodiment of this utility model provides a breaking conductor 100, which is applied to a short-circuit protection device for high-voltage lines. It includes a straight plate-shaped current-carrying conductor 1. The current-carrying conductor 1 has a breaking section with a reduced width in the middle. The breaking section includes a plurality of narrow diameter portions 2 connected in sequence. Each narrow diameter portion 2 includes a central fixing block 3 and an easily cuttable block 4 connected to both ends of the central fixing block 3. The two ends of the easily cuttable block 4 are recessed to form a groove 5.

[0029] The current-carrying conductor 1 is generally made of metal, such as the copper busbar with excellent conductivity as described in this embodiment. The shape of the current-carrying conductor 1 can be flexibly set according to the actual application scenario. For example, the shape of the current-carrying conductor 1 in this embodiment is approximately rectangular, and the two sides of the middle part of the current-carrying conductor 1 are concave inward to form a break segment with a relatively reduced width.

[0030] It should be noted that the number of the narrow sections 2 can be flexibly set according to the specifications and dimensions of the high-voltage line short-circuit protection device and the breaking current of the high-voltage line. In this embodiment, for example, the number of narrow sections 2 is two.

[0031] In some embodiments, each of the narrow sections 2 further includes two edge fixing blocks 6, with the ends of the two easily cuttable blocks 4 away from the central fixing block 3 respectively connected to the two edge fixing blocks 6. In practical applications, both the central fixing block 3 and the edge fixing blocks 6 are fixedly installed, while the easily cuttable blocks 4 are suspended. Thus, when the two easily cuttable blocks 4 at both ends of the central fixing block 3 are cut downwards, the central fixing block 3 and the edge fixing blocks 6 support the edges at both ends of the easily cuttable blocks 4, allowing the easily cuttable blocks 4 to be cut more smoothly.

[0032] Furthermore, the central fixing block 3 and the edge fixing block 6 can be fixed in various ways. For example, the central fixing block 3 is provided with a first mounting hole 8, and bolts are used to fix it. Similarly, a second mounting hole 9 can be provided on the edge fixing block 6, and bolts can be used to fix the edge fixing block 6.

[0033] To make the easy-to-cut block 4 easier to cut, the easy-to-cut block 4 is hexagonal prism-shaped, with grooves 5 formed on both the upper and lower surfaces of both ends of the easy-to-cut block 4. Thus, the grooves 5 at both ends of the easy-to-cut block 4 form weak points. When the easy-to-cut block 4 is cut, shearing force acts on the grooves 5, easily severing both ends of the easy-to-cut block 4.

[0034] In some embodiments, to prevent the current-carrying conductor 1 from shifting when the easily cuttable block 4 is cut, a limiting groove 7 is provided on the upper or lower surface of the central fixing block 3. By setting the limiting block and embedding it into the limiting groove 7, the current-carrying conductor 1 is firmly fixed, avoiding deformation caused by the shear force when the easily cuttable block 4 is cut, which would affect the cutting of the easily cuttable block 4.

[0035] Since the current-carrying conductor 1 is generally a metal conductor, the shearing force may cause the easy-to-cut block 4 to deform when it is cut. Therefore, the easy-to-cut block 4 is provided with an adaptation deformation hole 10 in the middle. In this way, when the easy-to-cut block 4 is deformed, the adaptation deformation hole 10 is squeezed to avoid the deformation caused by the easy-to-cut block 4 being cut and damaging the surrounding structure.

[0036] In addition, please refer to Figure 3 , 4 5 and 6, a high-voltage line short-circuit protection device of the present invention includes the above-mentioned breaking conductor 100, and also includes an insulating shell 101, a plurality of breaking grid plates 104, a plurality of gas generating devices 105 and a trigger 106.

[0037] The current-carrying conductor 1 traverses the insulating shell 101, so that the breaking section is located inside the insulating shell 101. The insulating shell 101 includes a lower shell 103 and an upper shell 102 fixedly connected to the upper port of the lower shell 103. The current-carrying conductor 1 is supported on the upper port of the lower shell 103, and the upper shell 102 and the lower shell 103 clamp and fix the current-carrying conductor 1.

[0038] Each of the central fixing blocks 3 is fixedly installed inside the insulating shell 101. As is provided inside the insulating shell 101, multiple support seats are located inside the lower shell 103, and each central fixing block 3 is fixedly supported on one of the support seats. In this embodiment, a bolt 110 is provided in the first mounting hole 8 on the central fixing block 3, and the central fixing block 3 is fixed by the bolt 110. Similarly, the edge fixing blocks 6 can also be fixed inside the insulating shell 101 by bolts.

[0039] An arc-extinguishing chamber 108 is provided inside the insulating outer shell 101, below each of the easily cuttable blocks 4. The arc-extinguishing chamber 108 contains quartz sand arc-extinguishing material. In this embodiment, the arc-extinguishing chambers 108 are provided on both sides of the support base supporting the central fixing block 3. After the easily cuttable block 4 is cut off, it falls into the arc-extinguishing chamber 108 and pushes the generated arc into the arc-extinguishing chamber 108.

[0040] Each of the aforementioned breaking grid plates 104 is vertically movable within the insulating housing 101. Each breaking grid plate 104 is provided with two cutting blades 107. Each breaking grid plate 104 is located above a narrow diameter portion 2, and the two cutting blades 107 are respectively aligned vertically with the two easily cuttable blocks 4 of a narrow diameter portion 2. Specifically, the insulating housing 101 has a plurality of cylindrical sealed chambers, which are spaced apart along the length of the current-carrying conductor. Each sealed chamber corresponds to a narrow diameter portion 2. The upper part of the sealed chamber is located within the upper housing 102, and the lower part is located within the lower housing 103. The upper part of the breaking grid plate 104 is cylindrical, and the lower part is provided with two parallel cutting blades 107. The upper part of the breaking grid plate 104 is slidably disposed above the sealed chamber, and the two cutting blades 107 are respectively disposed above the two easily cuttable blocks 4 of a narrow diameter portion 2.

[0041] Each of the gas generating devices 105 is disposed above and connected to a cutting grid 104. The gas generating device 105 can be a pyrotechnic device. The gas generating device 105 is installed at the top of the sealed chamber and connected to the top of the cutting grid 104. When triggered, the gas generating device 105 pushes the cutting grid 104 downwards, and the two cutting blades 107 of the cutting grid 104 cut off the two easily cuttable blocks 4 of the narrow diameter portion 2. To accurately cut the easily cuttable blocks 4, the lower end of the cutting blade 107 has a slit 109, which is adapted to the shape of the upper part of the easily cuttable block 4 so that both ends of the easily cuttable block 4 can be cut off. For example, if the easily cuttable block 4 is hexagonal prism-shaped, the shape of the slit 109 is an isosceles trapezoid, adapted to the shape of the upper part of the easily cuttable block 4.

[0042] like Figure 6As shown, the trigger 106 is connected to each of the gas generating devices 105. The trigger 106 is used to detect the current flowing through the current-carrying conductor 1, and when the current is overloaded, it sends a trigger signal to each of the gas generating devices 105, causing each of the gas generating devices 105 to start and push one of the breaking grid plates 104 to move downward. The two cutters 107 of each of the breaking grid plates 104 cut off the two easily cuttable blocks 4 of one of the narrow diameter portions 2. Each easily cuttable block 4 will generate an electric arc at the cut position at the moment of being cut, forming an arc voltage. Since each of the narrow diameter portions 2 is connected in series, the arc voltage will also be connected in series. When the overall arc voltage after series connection exceeds the power supply voltage in the high voltage line, the current in the high voltage line will decrease rapidly, thereby cutting off the current on the current-carrying conductor 1, that is, cutting off the current in the high voltage line.

[0043] In this document, the directional terms such as front, back, top, and bottom are defined based on the position of the components in the accompanying drawings and their relative positions to each other, solely for the purpose of clarity and convenience in expressing the technical solution. It should be understood that these are relative concepts and can vary depending on different methods of use and placement; the use of these directional terms should not limit the scope of protection claimed in this application.

[0044] Where there is no conflict, the embodiments and features described above can be combined with each other. The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A conductor interruptor, applied to a short-circuit protection device for high-voltage lines, characterized in that: The device includes a straight, plate-shaped current-carrying conductor. The current-carrying conductor has a narrow section with a reduced width in the middle. The narrow section includes a plurality of narrow sections connected in sequence. Each narrow section includes a central fixing block and an easily cuttable block connected to both ends of the central fixing block. The two ends of the easily cuttable block are recessed to form a groove.

2. The breaking conductor as described in claim 1, characterized in that: Each of the narrow sections further includes two edge fixing blocks, with one end of each of the two easily cuttable blocks away from the central fixing block respectively connected to the two edge fixing blocks.

3. The breaking conductor as described in claim 1, characterized in that: The easily cuttable block is hexagonal prism-shaped, with grooves formed on both the upper and lower surfaces at both ends of the easily cuttable block.

4. The breaking conductor as described in claim 1, characterized in that: The central fixing block is provided with a first mounting hole.

5. A breaking conductor as described in claim 1, characterized in that: The upper or lower surface of the central fixing block is provided with a limiting groove.

6. The breaking conductor as described in claim 1, characterized in that: The easily cuttable block has a deformation-adaptive hole in the middle.

7. A breaking conductor as described in claim 1, characterized in that: The number of narrow sections is two.

8. A short-circuit protection device for high-voltage lines, characterized in that: It includes a breaking conductor as described in any one of claims 1-7, and further includes an insulating shell, a plurality of breaking grids, a plurality of gas generating devices and a trigger; The current-carrying conductor traverses the insulating shell, with the breaking section located inside the insulating shell. Each central fixing block is fixedly installed inside the insulating shell, and an arc-extinguishing chamber is provided below each easily cuttable block inside the insulating shell. Each breaking grid is vertically movable inside the insulating shell, and each breaking grid has two cutters. Each breaking grid is located above a narrow section, and the two cutters are vertically aligned with the two easily cuttable blocks of the narrow section. Each gas generating device is located above a breaking grid and connected to the breaking grid. A trigger is connected to each gas generating device and is used to detect the current flowing through the current-carrying conductor. When the current is overloaded, the trigger sends a trigger signal to each gas generating device, causing each gas generating device to start and push a breaking grid downward. The two cutters of each breaking grid cut off the two easily cuttable blocks of the narrow section, thereby cutting off the current on the current-carrying conductor.

9. A high-voltage line short-circuit protection device as described in claim 8, characterized in that: The insulating shell is provided with multiple support bases, and each of the central fixing blocks is fixedly supported on one of the support bases. The arc extinguishing chambers are provided on both sides of the support base.

10. A high-voltage line short-circuit protection device as described in claim 8, characterized in that: The lower end of the cutter has a slit that is adapted to the shape of the upper part of the easy-to-cut block so that both ends of the easy-to-cut block can be cut off.

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