A line lightning arrester

Abstract

The present invention discloses a line arrester, including an arrester body, the arrester body including a varistor string, a first leakage current detection coil is arranged above the varistor string, a second leakage current detection coil is arranged below the varistor string, an electrode, an electromagnetic release, an energy storage coil and a clipping capacitor are arranged on the arrester body, one end of the energy storage coil is used to be electrically connected with the first leakage current detection coil and the second leakage current detection coil, the other end of the energy storage coil is used to be electrically connected with the clipping capacitor, a parallel coil is arranged on the electromagnetic release, one end of the electromagnetic release is used to be electrically connected with the electrode, and the other end of the electromagnetic release is provided with a grounding wire for connecting the grounding wire. The above structure enables the present invention to have a leakage current detection function, prevent the intrusion damage caused by lightning electromagnetic pulses, and ensure the normal operation of the electromagnetic release mechanism.

Description

Technical Field

[0001] The invention relates to the field of lightning arresters, in particular to a line lightning arrester. Background Art

[0002] Lightning arrester is an excellent overvoltage protection device suitable for the protection of power transmission and transformation lines and AC electrical equipment. Its quality and performance are directly related to the safety of power grid operation.

[0003] The lightning arrester in the prior art has the following disadvantages when in use:

[0004] 1 The lightning arrester in the prior art does not have a leakage current detection function and is easily damaged by the intrusion of lightning electromagnetic pulses.

[0005] 2. The lightning arrester is inconvenient to install and remove, causing inconvenience to the installers.

[0006] Therefore, a new type of line lightning arrester with excellent performance for solving the above problems has become an issue that the whole society urgently needs to study. Summary of the invention

[0007] In order to solve the above technical problems, the technical solution provided by the present invention is: a line lightning arrester, including a lightning arrester body, the lightning arrester body including a varistor string, a first leakage current detection coil is arranged above the varistor string, and a second leakage current detection coil is arranged below the varistor string, the lightning arrester body is provided with an electrode, an electromagnetic release, an energy storage coil and a clipping capacitor, one end of the energy storage coil is used to be electrically connected to the first leakage current detection coil and the second leakage current detection coil, the other end of the energy storage coil is used to be electrically connected to the clipping capacitor, the electromagnetic release is provided with a parallel coil, one end of the electromagnetic release is used to be electrically connected to the electrode, and the other end of the electromagnetic release is provided with a grounding wire for grounding.

[0008] Furthermore, a temperature fuse is installed inside the varistor string, and when the arrester is overheated, the bottom electromagnetic coil release can be disconnected to achieve an automatic disengagement function before the arrester is damaged.

[0009] Furthermore, the energy storage coil is provided with two groups, namely the first energy storage coil and the second energy storage coil. The two ends of the clipping capacitor are electrically connected to the first energy storage coil and the second energy storage coil respectively. The energy storage coil is set so that when the leakage current of the lightning arrester reaches 50uA and reaches the action setting value of the electromagnetic energy storage ring, the energy storage ring triggers the coil release to act, thereby realizing automatic disengagement of the lightning arrester.

[0010] Furthermore, a low-flow fuse is arranged inside the electromagnetic release.

[0011] Furthermore, bolts are provided on the arrester body.

[0012] Furthermore, the varistor string is formed by a plurality of resistors connected in series.

[0013] Furthermore, energy storage coils are also arranged on the arrester. The arrangement of two sets of energy storage coils is used to achieve energy matching with the electromagnetic energy storage ring at the bottom.

[0014] Furthermore, the arrester body shed is made of super-hydrophobic material, which improves the anti-fouling performance of the arrester.

[0015] The advantages of the present invention over the prior art are: the present invention adopts the above structure, solves the problems existing in the prior art, and has a leakage detection function; when the system leakage current exceeds the set value, the disconnector automatically disconnects, thereby achieving the purpose of disconnecting the arrester from the grid. Since the energy storage coil adopts a conjugate structure, the lightning electromagnetic pulse generated when the lightning current passes through the arrester varistor string is highly destructive, so the energy storage coil adopts a conjugate structure to prevent the intrusion damage caused by the lightning electromagnetic pulse and ensure the normal operation of the electromagnetic tripping mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The utility model is a structural schematic diagram of a line lightning arrester of the present invention.

[0017] Figure 2 It is a schematic diagram of the internal structure of a novel lightning arrester of the present invention.

[0018] As shown in the figure: 1. Lightning arrester body, 2. Varistor string, 3. First leakage current detection coil, 4. Second leakage current detection coil, 5. Electrode, 6. Electromagnetic release, 7. Energy storage coil, 8. Clipping capacitor, 9. First energy storage coil, 10. Second energy storage coil, 11. Grounding wire, 12. Bolt, 13. Coil. DETAILED DESCRIPTION

[0019] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0020] The present invention is described in detail with reference to the accompanying drawings.

[0021] The present invention provides a line lightning arrester in a specific implementation, including a lightning arrester body 1, the lightning arrester body 1 including a varistor string 2, a first leakage current detection coil 3 is arranged above the varistor string 2, and a second leakage current detection coil 4 is arranged below the varistor string 2, the lightning arrester body 1 is provided with an electrode 5, an electromagnetic release 6, an energy storage coil 7 and a clipping capacitor 8, one end of the energy storage coil 7 is used to be electrically connected to the first leakage current detection coil 3 and the second leakage current detection coil 4, the other end of the energy storage coil 7 is used to be electrically connected to the clipping capacitor 8, a parallel coil 13 is arranged on the electromagnetic release 6, one end of the electromagnetic release 6 is used to be electrically connected to the electrode 5, and the other end of the electromagnetic release 6 is provided with a grounding wire 11 for grounding.

[0022] A temperature fuse is installed inside the varistor string 2. The energy storage coil 7 is provided with two groups, namely the first energy storage coil 9 and the second energy storage coil 10, and the two ends of the clipping capacitor 8 are electrically connected to the first energy storage coil 9 and the second energy storage coil 10 respectively. A low-flow fuse is provided inside the electromagnetic release 6. A bolt 12 is provided on the arrester body 1. The varistor string 2 is composed of a plurality of resistors connected in series.

[0023] The specific implementation of the present invention is as follows: When the present invention is in use, the arrester body 1 is mainly composed of a varistor string 2. The varistor has a system leakage current due to its own curve characteristics. The performance of the arrester body 1 can be monitored through the leakage current, and the dynamic leakage current can be charged to the clipping capacitor 8 through the energy storage coil 7 to achieve the purpose of energy storage. When the system leakage current reaches 50uA, it reaches the action threshold set by the energy storage coil 7, causing the built-in low-flow fuse of the electromagnetic release 6 to melt, cutting off the magnetic balance of the energy storage coil 7 and causing the release to disconnect, achieving the purpose of the arrester being out of the system.

[0024] As a further explanation of the present invention, the principle of the energy storage coil is as follows: when the lightning arrester body 1 is normally connected to the system, the lightning arrester itself has an industrial frequency leakage current, and the energy storage coil 7 generates an induced current and stores energy through the current flowing through it. When the current exceeds 50uA, it exceeds the maximum current of the fuse set by the energy storage coil 7, and the electromagnetic release 6 is activated; in order to prevent the energy storage coil 7 from malfunctioning due to the lightning current passing through the lightning arrester, a clipping capacitor 8 is added to the design of the energy storage coil 7 to filter out lightning electromagnetic pulses.

[0025] As a further elaboration of the present invention, the arrester body shed is made of super-hydrophobic material, which improves the anti-fouling function of the arrester.

[0026] The shape and size of the invention can be adjusted according to the size of the place of use, but the internal structure and principle remain unchanged.

[0027] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. A line lightning arrester, characterized in that: The invention comprises a lightning arrester body (1), the lightning arrester body (1) comprising a varistor string (2), a first leakage current detection coil (3) being arranged above the varistor string (2), a second leakage current detection coil (4) being arranged below the varistor string (2), an electrode (5), an electromagnetic release (6), an energy storage coil (7) and a clipping capacitor (8) being arranged on the lightning arrester body (1), one end of the energy storage coil (7) being used for being electrically connected to the first leakage current detection coil (3) and the second leakage current detection coil (4), and the other end of the energy storage coil (7) being used for being electrically connected to the clipping capacitor (8). The electromagnetic release (6) is provided with a parallel coil (13), one end of the electromagnetic release (6) is used to be electrically connected to the electrode (5), the other end of the electromagnetic release (6) is provided with a grounding wire (11) for connecting the grounding wire (11), a temperature fuse is installed inside the varistor string (2), the energy storage coil (7) is provided with two groups, namely a first energy storage coil (9) and a second energy storage coil (10), and the two ends of the clipping capacitor (8) are electrically connected to the first energy storage coil (9) and the second energy storage coil (10), respectively.

2. A line lightning arrester according to claim 1, characterized in that: The electromagnetic release (6) is provided with a low-flow fuse inside.

3. A line arrester according to claim 1, characterized in that: Bolts (12) are provided on the arrester body (1).

4. A line lightning arrester according to claim 1, characterized in that: The varistor string (2) is composed of a plurality of resistors connected in series.

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