Lightning protection device and electrical equipment

Abstract

The utility model provides a lightning protection device and electrical equipment. The lightning protection device comprises a first electrical connection end, a second electrical connection end, a first overvoltage protection unit, a thermal tripping device and a fuse, wherein the first overvoltage protection unit, the thermal tripping device and the fuse are arranged between the first electrical connection end and the second electrical connection end; the first overvoltage protection unit is connected in series with the thermal tripping device, and the fuse is connected in parallel with the thermal tripping device. According to the lightning protection device and the electrical equipment provided by the invention, after the thermal tripping device trips and breaks, current passes through the bypass fuses connected in parallel, and the fuses are fused; as the fuse has great breaking capacity, and electric arcs cannot overflow outwards, the lightning protection device is ensured not to be on fire, and greater safety accidents are prevented from being caused.

Description

Technical Field

[0001] The present application relates to the technical field of lightning arresters, and in particular to a lightning arrester and electrical equipment. Background Art

[0002] like Figure 1 As shown in the figure, the existing lightning arrester consists of a varistor MOV0 and a thermal trip device TS0. When the arrester discharges lightning current and continues to flow, the thermal trip device TS0 trips due to heat accumulation. Because the thermal trip device TS0 has minimal arc extinguishing capability, as the applied voltage of the arrester gradually increases, the arc energy increases. The thermal trip device TS0 can no longer safely and effectively interrupt the arc, which can easily cause the arrester to catch fire, leading to a larger safety accident. Utility Model Content

[0003] The present application provides a lightning arrester and electrical equipment to solve the problem that the thermal trip device of the existing lightning arrester cannot effectively interrupt the arc, which easily causes the lightning arrester to catch fire.

[0004] On one hand, the present application provides a lightning arrester, comprising a first electrical connection end and a second electrical connection end, a first overvoltage protection unit, a thermal trip device, and a fuse arranged between the first electrical connection end and the second electrical connection end;

[0005] The first overvoltage protection unit is connected in series with the thermal trip device, and the fuse is connected in parallel with the thermal trip device.

[0006] In one example, the first overvoltage protection unit includes at least one of a varistor, a gas discharge tube, and a transient voltage suppression diode.

[0007] In one example, one end of the first overvoltage protection unit is connected to the first electrical connection end, the other end of the first overvoltage protection unit is connected to one end of the thermal trip device, and the other end of the thermal trip device is connected to the second electrical connection end.

[0008] In one example, a second overvoltage protection unit is further included between the first electrical connection end and the second electrical connection end. The second overvoltage protection unit is connected in series with the fuse and then connected in parallel with the thermal trip device.

[0009] In one example, the second overvoltage protection unit includes at least one of a varistor, a gas discharge tube, and a transient voltage suppression diode.

[0010] In one example, one end of the second overvoltage protection unit is connected to one end of the thermal trip device, the other end of the second overvoltage protection unit is connected to one end of the fuse, and the other end of the fuse is connected to the other end of the thermal trip device.

[0011] On the other hand, the present application provides an electrical device, including an electrical equipment cabinet and the lightning arrester.

[0012] In one example, the lightning arrester is arranged inside the electrical equipment cabinet or outside the electrical equipment cabinet.

[0013] In one example, the electrical equipment cabinet has an input end and an output end, and the lightning arrester is arranged at the input end or the output end.

[0014] The lightning arrester and electrical equipment provided by the present application, after the thermal trip device trips and disconnects, the current passes through the parallel bypass fuse and the fuse blows; because the fuse has a large breaking capacity and will not overflow the arc to the outside, it ensures that the lightning arrester will not catch fire, avoiding causing a larger safety accident. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0016] Figure 1 This is a schematic diagram of an existing lightning arrester;

[0017] Figure 2 This is a schematic diagram of a lightning arrester provided in an embodiment of the present application;

[0018] Figure 3 This is a schematic diagram of another lightning arrester provided in an embodiment of the present application;

[0019] Figure 4 This is a schematic diagram of another lightning arrester provided in an embodiment of the present application;

[0020] Figure 5 It is a schematic diagram of the electrical equipment and lightning arrester provided in the embodiment of the present application. DETAILED DESCRIPTION

[0021] In order to facilitate understanding of the present application, the present application will be described in more detail below in conjunction with the accompanying drawings and specific embodiments. Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art in the technical field of this application. The terms used in this specification and in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in this specification includes any and all combinations of one or more related listed items.

[0022] It should be noted that, in the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0023] like Figure 2 As shown, an embodiment of the present application provides a lightning arrester, including a first electrical connection terminal L1 and a second electrical connection terminal L2, a first overvoltage protection unit, a thermal trip device TS1 and a fuse FU1 arranged between the first electrical connection terminal L1 and the second electrical connection terminal L2.

[0024] In this example, the first overvoltage protection unit includes a varistor MOV1. The varistor MOV1 is connected in series with the thermal trip device TS1, and a fuse FU1 is connected in parallel with the thermal trip device TS1. Specifically, one end of the varistor MOV1 is connected to the first electrical connection terminal L1, the other end of the varistor MOV1 is connected to one end of the thermal trip device TS1, and the other end of the thermal trip device TS1 is connected to the second electrical connection terminal L2.

[0025] Furthermore, the device further includes a second overvoltage protection unit disposed between the first electrical connection terminal L1 and the second electrical connection terminal L2. In this example, the second overvoltage protection unit includes a varistor MOV2. Specifically, the varistor MOV2 is connected in series with the fuse FU1 and then in parallel with the thermal trip device TS1. That is, one end of the varistor MOV2 is connected to one end of the thermal trip device TS1, the other end of the varistor MOV2 is connected to one end of the fuse FU1, and the other end of the fuse FU1 is connected to the other end of the thermal trip device TS1.

[0026] In the above embodiment, varistor MOV1 or varistor MOV2 is a nonlinear resistor primarily made of a metal oxide, such as zinc oxide. Varistor MOV1 plays a primary role during normal operation and can operate over a wide voltage range, both high and low. Varistor MOV2 functions during the normal trip state and can operate at a very low voltage.

[0027] During operation, when thermal trip device TS1 trips and disconnects, current flows through the parallel bypass fuse FU1 and varistor MOV2, causing fuse FU1 to melt. Because fuse FU1 has a high breaking capacity and prevents arc leakage, it prevents the lightning arrester from catching fire and causing a larger safety accident.

[0028] like Figure 3 As shown, one embodiment of the present application provides another lightning arrester. Figure 2 The difference in the example is that Figure 3In an example of , the second overvoltage protection unit includes a gas discharge tube (GDT). The gas discharge tube (GDT) is a device having one gap or multiple gaps and enclosed in a discharge medium different from air at atmospheric pressure.

[0029] During operation, when thermal trip device TS1 trips and disconnects, current flows through the parallel bypass fuse FU1 and the gas discharge tube GDT, causing fuse FU1 to melt. Because fuse FU1 has a high breaking capacity and does not leak arc, it ensures that the lightning arrester will not catch fire, avoiding the possibility of a larger safety accident.

[0030] like Figure 4 As shown, an embodiment of the present application provides another lightning arrester. Figure 2 The difference in the example is that Figure 4 In the example of , the second overvoltage protection unit includes a transient voltage suppressor diode (TVS). The transient voltage suppressor diode (TVS) is an overvoltage protection device with bidirectional voltage stabilization characteristics and bidirectional negative resistance characteristics.

[0031] During operation, when thermal trip device TS1 trips and disconnects, current flows through the parallel bypass fuse FU1 and transient voltage suppressor diode TVS, causing fuse FU1 to melt. Because fuse FU1 has a high breaking capacity and does not arc externally, it ensures that the lightning arrester will not catch fire, avoiding the possibility of a larger safety accident.

[0032] It should be noted that, for the second overvoltage protection unit, in other examples, a varistor, a gas discharge tube, and a transient voltage suppressor diode can be used in combination.

[0033] It should be noted that, in other examples, the first overvoltage protection unit may be replaced by a gas discharge tube or a transient voltage suppressor diode, or a varistor, a gas discharge tube, and a transient voltage suppressor diode may be used in combination.

[0034] like Figure 5 As shown, another embodiment of the present application provides an electrical device, which includes but is not limited to a photovoltaic inverter, a wind power converter, a frequency converter, an SVG, an energy storage device, etc.

[0035] Electrical equipment includes electrical equipment cabinets, Figure 2-Figure 4 Any lightning arrester described above.

[0036] In one example, the lightning arrester is arranged inside the electrical equipment cabinet or outside the electrical equipment cabinet.

[0037] In one example, the electrical equipment cabinet has an input end (shown as 1 in the figure) and an output end (shown as 2 in the figure), and the lightning arrester is arranged at the input end or the output end. In the example shown in the figure, lightning arrester 1 is arranged at the input end of the electrical equipment cabinet, and lightning arrester 2 is arranged at the output end of the electrical equipment cabinet.

[0038] It should be noted that the preferred embodiments of the present application are given in the specification and drawings of this application. However, the present application can be implemented in many different forms and is not limited to the embodiments described in this specification. These embodiments are not intended to be additional limitations on the content of this application. The purpose of providing these embodiments is to make the understanding of the disclosure of this application more thorough and comprehensive. In addition, the above-mentioned technical features can be combined with each other to form various embodiments not listed above, which are all considered to be within the scope of the description of this application; further, it is obvious to those skilled in the art that improvements or changes can be made based on the above description, and all such improvements and changes should fall within the scope of protection of the claims attached to this application.

Claims

1. A lightning arrester, characterized in that: It includes a first electrical connection end and a second electrical connection end, and a first overvoltage protection unit, a thermal trip device and a fuse arranged between the first electrical connection end and the second electrical connection end; The first overvoltage protection unit is connected in series with the thermal trip device, and the fuse is connected in parallel with the thermal trip device.

2. The lightning arrester according to claim 1, characterized in that: The first overvoltage protection unit includes at least one of a varistor, a gas discharge tube, and a transient voltage suppression diode.

3. The lightning arrester according to claim 1, characterized in that: One end of the first overvoltage protection unit is connected to the first electrical connection end, the other end of the first overvoltage protection unit is connected to one end of the thermal trip device, and the other end of the thermal trip device is connected to the second electrical connection end.

4. The lightning arrester according to any one of claims 1 to 3, characterized in that: It also includes a second overvoltage protection unit arranged between the first electrical connection end and the second electrical connection end. The second overvoltage protection unit is connected in series with the fuse and then connected in parallel with the thermal trip device.

5. The lightning arrester according to claim 4, characterized in that: The second overvoltage protection unit includes at least one of a varistor, a gas discharge tube, and a transient voltage suppression diode.

6. The lightning arrester according to claim 4, characterized in that: One end of the second overvoltage protection unit is connected to one end of the thermal trip device, the other end of the second overvoltage protection unit is connected to one end of the fuse, and the other end of the fuse is connected to the other end of the thermal trip device.

7. An electrical device, characterized in that: The invention comprises an electrical equipment cabinet and a lightning arrester according to any one of claims 1 to 6.

8. The electrical device according to claim 7, characterized in that The lightning arrester is arranged inside the electrical equipment cabinet or outside the electrical equipment cabinet.

9. The electrical device according to claim 7, characterized in that The electrical equipment cabinet has an input end and an output end, and the lightning arrester is arranged at the input end or the output end.

Images