Lightning arrester assembly with grading ring at lightning arrester joint

Abstract

The utility model relates to a lightning arrester assembly with grading rings at lightning arrester joints, which is characterized in that an upper grading ring is arranged at the upper end of an upper section of lightning arrester, a lower grading ring is arranged at the lower end of a lower section of lightning arrester, and a first middle grading ring and a second middle grading ring which are symmetrical up and down are arranged at the joints of the upper section of lightning arrester and the lower section of lightning arrester; a first mounting surface at the lower end of the first middle grading ring and a second mounting surface at the upper end of the second middle grading ring are arranged between the upper section of lightning arrester and the lower section of lightning arrester and are fixedly connected through a grading ring connecting assembly, and a connecting stud penetrates through the first mounting surface and the second mounting surface; and the upper end of the connecting stud is inserted into the first lower electrode in the lower end of the upper section lightning arrester, and the lower end of the connecting stud is inserted into the second upper electrode in the upper end of the lower section lightning arrester. According to the utility model, the grading rings are arranged at the upper end and the lower end of the lightning arrester assembly and at the joint of the two adjacent lightning arresters, so that a multi-stage grading structure is formed, and the electric field intensity at the periphery of the whole lightning arrester assembly can be uniformly distributed.

Description

Technical Field

[0001] This utility model relates to the field of surge arrester technology, specifically a surge arrester assembly with an equalizing ring at the surge arrester connection. Background Art

[0002] Metal oxide surge arresters are mainly used to prevent overvoltage from transmission lines from damaging electrical equipment. However, surge arresters are greatly affected by environmental factors during operation. In particular, stray capacitance to ground can cause distortion of the electric field around the surge arrester, resulting in uneven electric field strength distribution. If the surge arrester operates in this environment for a long time, it is very easy to cause deterioration of the surge arrester's resistor element. Moreover, the higher the voltage level, the more obvious this deterioration is. This can create safety hazards for the long-term operation of the surge arrester and may also cause local flashover.

[0003] To address the aforementioned issues, existing surge arresters typically incorporate equipotential rings (shielding rings) at both the top and bottom. However, many surge arresters are now modular, consisting of multiple individual arrester units connected in series. Furthermore, equipotential rings are often not installed at the connection points between adjacent arrester units. This makes partial discharges prone to occur at the flange connections of the arrester, which can lead to partial breakdown of the arrester assembly and create safety hazards over time. Additionally, while equipotential rings are often placed only at the top or bottom of the arrester, and a single equipotential ring can provide a deeper shielding depth and more uniform electric field distribution at the shielded location, this can also result in more severe distortion of the electric field distribution at the unshielded areas of the arrester. This is especially true when multiple arrester units are connected in series, resulting in a longer overall length, which makes the aforementioned issues more likely to occur.

[0004] Patent CN209312497U discloses a 500kV line lightning and ice flashover protection composite insulator. Its upper unit includes parallel surge arresters and a first sub-insulator, while the lower unit includes parallel second and third sub-insulators. An upper equipotential ring is installed at the upper end of the lower unit, and a lower equipotential ring is installed at the lower end. This device is mainly used to improve the lightning and ice flashover protection capability of the 500kV composite insulator. Although the upper equipotential ring has a double-ring structure, its upper and lower sub-equipotential rings are connected by a connecting bracket.

[0005] Patent CN201122475Y discloses a DC surge arrester, which includes at least two surge arrester units, and a shielding ring is provided around the connection between the upper and lower sections of the surge arrester unit. However, the shielding ring used in this device is a U-shaped ring with one side open and is directly fitted onto the connection between the upper and lower surge arresters.

[0006] Patent CN202940587U discloses a surge arrester with remote transmission of action signal, which includes two surge arrester units connected in series. The upper surge arrester unit has a high-voltage terminal and a shielding ring fixed at the upper end, and the lower surge arrester unit has an insulating base and a lower shielding ring fixed at the lower end. However, no shielding ring or other structure is provided at the connection between the upper and lower surge arrester units. Utility Model Content

[0007] The purpose of this utility model is to provide a surge arrester assembly with equalizing rings at the connection of the surge arrester. Equalizing rings are provided at the upper end, lower end and connection of adjacent surge arrester sections, thereby forming a multi-level equalizing structure. This can make the electric field intensity distribution around the entire surge arrester assembly uniform and avoid the resistor sheet being in a non-uniform electric field for a long time, which would lead to the deterioration of the resistor sheet.

[0008] The objective of this utility model is achieved through the following technical solution:

[0009] A surge arrester assembly with an equipotential ring at the connection point includes an upper surge arrester and a lower surge arrester. The upper surge arrester has an upper equipotential ring at its upper end, and the lower surge arrester has a lower equipotential ring at its lower end. The connection point between the upper and lower surge arresters has a first intermediate equipotential ring and a second intermediate equipotential ring symmetrically arranged. The first mounting surface at the lower end of the first intermediate equipotential ring and the second mounting surface at the upper end of the second intermediate equipotential ring are located between the upper and lower surge arresters and are fixedly connected by an equipotential ring connection assembly. A connecting stud passes through the first and second mounting surfaces, with the upper end of the connecting stud inserted into the first lower electrode inside the lower end of the upper surge arrester and the lower end inserted into the second upper electrode inside the upper end of the lower surge arrester. The upper equipotential ring, the lower equipotential ring, the first intermediate equipotential ring, and the second intermediate equipotential ring have the same structure and shielding depth.

[0010] The upper section of the surge arrester is provided with an upper terminal, and the upper terminal is provided with an upper terminal screw that is inserted into the first upper electrode inside the upper section of the surge arrester. The upper equalizing mounting surface of the upper end of the upper equalizing ring is pressed and fixed by the upper terminal.

[0011] The lower section of the surge arrester is provided with a lower bolt at its lower end, and the lower bolt has a lower bolt screw inserted into the second lower electrode inside the lower end of the lower section of the surge arrester. The lower equalizing mounting surface of the lower end of the lower equalizing ring is pressed and fixed by the lower bolt.

[0012] The lower section of the surge arrester is provided with a support at its lower end, and the lower bolt thread passes through the support mounting plate at the upper end of the support and the lower equalizing mounting surface in sequence. A grounding bolt is provided on one side of the support, and a support base plate is provided on the lower side of the support.

[0013] The advantages and positive effects of this utility model are as follows:

[0014] 1. This utility model provides equalizing rings at the upper end, lower end, and connection point of adjacent surge arrester sections of the surge arrester assembly, thereby forming a multi-level equalizing structure. This ensures that the electric field strength distribution around the entire surge arrester assembly is uniform, preventing the resistor from being in an uneven electric field for a long time, which could lead to resistor degradation.

[0015] 2. In this utility model, the first intermediate equalizing ring and the second intermediate equalizing ring are disposed between the upper and lower surge arresters and are fixed together by the equalizing ring connecting assembly and the connecting stud. In addition to ensuring electrical continuity and uniform electric field strength between the upper and lower surge arresters to prevent partial discharge, this can also improve the connection strength between the upper and lower surge arresters.

[0016] 3. The upper equalizing ring, lower equalizing ring, first intermediate equalizing ring and second intermediate equalizing ring of this utility model have the same structure and shielding depth. This can avoid the situation where the electric field is uniform at the shielding position of the equalizing ring and the electric field is severely distorted at the unshielded position due to the shielding depth of a single equalizing ring being too deep. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] Figure 2 for Figure 1 Enlarged view of point A in the image.

[0019] Figure 3 for Figure 1 Enlarged view of point B in the image.

[0020] Figure 4 for Figure 1 Enlarged view of point C in the image.

[0021] Wherein, 1 is the upper terminal, 101 is the upper terminal screw, 2 is the upper equalizing ring, 201 is the upper equalizing ring mounting surface, 3 is the first upper electrode, 4 is the insulating layer, 5 is the outer sleeve, 6 is the resistor sheet, 7 is the core adjustment block, 8 is the equalizing ring connecting assembly, 9 is the connecting stud, 10 is the support mounting plate, 11 is the lower bolt, 1101 is the lower bolt screw, 12 is the grounding bolt, 13 is the support base plate, 14 is the first intermediate equalizing ring, 1401 is the first mounting surface, 15 is the second intermediate equalizing ring, 1501 is the second mounting surface, 16 is the first lower electrode, 17 is the second upper electrode, 18 is the lower equalizing ring, 1801 is the lower equalizing ring mounting surface, and 19 is the second lower electrode. DETAILED DESCRIPTION

[0022] The present invention will now be described in further detail with reference to the accompanying drawings.

[0023] like Figures 1-4As shown, this utility model includes an upper surge arrester and a lower surge arrester. The upper surge arrester has an upper equalizing ring 2 at its upper end, and the lower surge arrester has a lower equalizing ring 18 at its lower end. The connection between the upper and lower surge arresters is provided with a first intermediate equalizing ring 14 and a second intermediate equalizing ring 15, symmetrically arranged. Figure 3 As shown, the first mounting surface 1401 at the lower end of the first intermediate equalizing ring 14 and the second mounting surface 1501 at the upper end of the second intermediate equalizing ring 15 are located between the upper and lower surge arresters and are fixedly connected by the equalizing ring connecting assembly 8. A connecting stud 9 passes through the first mounting surface 1401 and the second mounting surface 1501, and the upper end of the connecting stud 9 is inserted into the first lower electrode 16 in the lower end of the upper surge arrester, and the lower end is inserted into the second upper electrode 17 in the upper end of the lower surge arrester.

[0024] like Figure 2 As shown, in this embodiment, the upper end of the upper surge arrester is provided with an upper terminal 1, and the upper terminal 1 is provided with an upper terminal screw 101 inserted into the first upper electrode 3 inside the upper end of the upper surge arrester. The upper equalizing mounting surface 201 of the upper end of the upper equalizing ring 2 is pressed and fixed by the upper terminal 1.

[0025] like Figure 4 As shown, in this embodiment, the lower end of the lower arrester is provided with a lower bolt 11, and the lower bolt 11 is provided with a lower bolt screw 1101 inserted into the second lower electrode 19 inside the lower end of the lower arrester. The lower equalizing mounting surface 1801 of the lower end of the lower equalizing ring 18 is pressed and fixed by the lower bolt 11.

[0026] like Figure 4 As shown, in this embodiment, the lower section of the surge arrester is provided with a support at the lower end, and the lower bolt 1101 passes through the support mounting plate 10 at the upper end of the support and the lower equalizing mounting surface 1801 in sequence. A grounding bolt 12 is provided on one side of the support to connect with the earth, and a support base plate 13 is provided on the lower side of the support.

[0027] like Figures 1-4 As shown, in this embodiment, the upper and lower surge arresters have the same structure, both including a silicone outer jacket 6. The outer jacket 6 has an insulating layer 4 (made of epoxy resin-impregnated glass fiber cloth tape). The insulating layer 4 has an upper electrode, a resistor sheet 6, a core adjustment block 7 (made of aluminum rod) and a lower electrode arranged sequentially from top to bottom. The surge arrester structure is a technology known in the art.

[0028] The working principle of this utility model is as follows:

[0029] This invention features equalizing rings at the top and bottom of the surge arrester assembly, as well as at the connection points between adjacent surge arrester sections, forming a multi-level equalizing structure. Each equalizing ring can equalize the electric field around the surge arrester, thereby ensuring a uniform distribution of the electric field strength around the entire surge arrester assembly and preventing the resistor from deteriorating due to the resistor being in a non-uniform electric field for a long time.

[0030] Other examples Figure 3 As shown, this utility model places the first mounting surface 1401 at the lower end of the first intermediate equalizing ring 14 and the second mounting surface 1501 at the upper end of the second intermediate equalizing ring 15 between the upper and lower surge arresters, and fixes them together through the equalizing ring connecting assembly 8 and the connecting stud 9. This not only ensures electrical continuity and uniform electric field strength between the upper and lower surge arresters to prevent partial discharge, but also improves the connection strength between the upper and lower surge arresters, thereby enhancing the safety and stability of the surge arrester operation. The equalizing ring connecting assembly 8 can be a bolt and nut assembly.

[0031] like Figure 1 As shown, the upper equalizing ring 2, lower equalizing ring 18, first intermediate equalizing ring 14 and second intermediate equalizing ring 15 of this utility model have the same structure and shielding depth. In addition to ensuring that the electric field strength of each part of the surge arrester assembly is uniform, this also avoids the situation that the electric field at the shielded position of the equalizing ring is uniform and the electric field at the unshielded position is severely distorted due to the shielding depth of a single equalizing ring being too deep.

Claims

1. A surge arrester assembly with an equipotential ring at the connection point, characterized in that: The system includes an upper surge arrester and a lower surge arrester. The upper surge arrester has an upper equalizing ring (2) at its upper end, and the lower surge arrester has a lower equalizing ring (18) at its lower end. The connection between the upper and lower surge arresters is provided with a first intermediate equalizing ring (14) and a second intermediate equalizing ring (15) that are symmetrically arranged. The first mounting surface (1401) at the lower end of the first intermediate equalizing ring (14) and the second mounting surface (1501) at the upper end of the second intermediate equalizing ring (15) are located on the upper and lower surge arresters. They are fixed together by a voltage equalization ring connecting assembly (8). A connecting stud (9) passes through the first mounting surface (1401) and the second mounting surface (1501). The upper end of the connecting stud (9) is inserted into the first lower electrode (16) inside the lower end of the upper section of the surge arrester, and the lower end is inserted into the second upper electrode (17) inside the upper end of the lower section of the surge arrester. The upper voltage equalization ring (2), the lower voltage equalization ring (18), the first intermediate voltage equalization ring (14), and the second intermediate voltage equalization ring (15) have the same structure and shielding depth.

2. The surge arrester assembly with an equalizing ring at the surge arrester connection as described in claim 1, characterized in that: The upper section of the surge arrester is provided with an upper terminal (1), and the upper terminal (1) is provided with an upper terminal screw (101) inserted into the first upper electrode (3) inside the upper section of the surge arrester. The upper equalizing mounting surface (201) at the upper end of the upper equalizing ring (2) is pressed and fixed by the upper terminal (1).

3. The surge arrester assembly with an equalizing ring at the surge arrester connection as described in claim 1, characterized in that: The lower section of the surge arrester is provided with a lower bolt (11) at the lower end, and the lower bolt (11) is provided with a lower bolt screw (1101) inserted into the second lower electrode (19) inside the lower end of the lower section of the surge arrester. The lower equalizing mounting surface (1801) at the lower end of the lower equalizing ring (18) is pressed and fixed by the lower bolt (11).

4. The surge arrester assembly with an equalizing ring at the surge arrester connection as described in claim 3, characterized in that: The lower section of the surge arrester is provided with a support at its lower end, and the lower bolt (1101) passes through the support mounting plate (10) at the upper end of the support and the lower equalizing mounting surface (1801) in sequence. A grounding bolt (12) is provided on one side of the support, and a support base plate (13) is provided on the lower side of the support.

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