High-gradient power transmission line lightning arrester

Abstract

The utility model provides a high-gradient power transmission line lightning arrester which comprises the components of an insulating base which is used for fixing the lightning arrester on a tower; the first end of the lightning arrester body is connected with the insulating base; the electrode ring is composed of an upper electrode ring and a lower electrode ring, an air gap electrode structure is formed between the upper electrode ring and the lower electrode ring, and the second end of the lightning arrester body is connected with the upper electrode ring; the fixing assembly is used for fixing the lightning arrester on a power transmission conductor, the first end of the fixing assembly is connected with the lower electrode ring, and the second end of the fixing assembly is connected with the power transmission conductor; the lightning arrester body is formed by connecting two sections of lightning arrester body elements in series, and a high-gradient zinc oxide resistor disc with the voltage gradient of 250-320V / mm is packaged in each lightning arrester body element. The high-gradient power transmission line lightning arrester is simple in structure, small and light, excellent in performance and suitable for all-phase lightning protection installation and use of alternating current and direct current power transmission lines of various voltage grades.

Description

TECHNICAL FIELD

[0001] The utility model relates to a lightning arrester technical field, concretely relates to a high gradient transmission line lightning arrester. BACKGROUND

[0002] With the continuous development of power system, 500kV transmission line has become the backbone network frame of our country. However, the transmission line passes through the complex terrain such as mountainous area, hilly area frequently, is vulnerable to lightning, and seriously threatens the safe and stable operation of power grid. According to statistics, in the past 10 years, the lightning fault of 500kV AC transmission line of power grid has occurred more than 1000 times, and the systematic lightning protection work is urgent.

[0003] At present, installing line lightning arrester is one of the most effective measures to prevent transmission line lightning trip. But the application of existing lightning arrester faces many severe technical challenges: (1) heavy structure, large installation load. The structure size of existing 500kV lightning arrester is long, and the volume and weight are large, and the installation support structure designed for it is complex, which brings significant additional mechanical load to the tower, and puts forward higher requirements for the structural strength of the tower. (2) installation space is limited, and electrode ring is difficult to fix. 500kV transmission line generally adopts 4 split conductors, when the lightning arrester is installed near the tower head, there is a great tension between the split conductors, and the commonly used spacer rod is difficult to install reliably, which leads to the difficulty in fixing the electrode ring, and a large angle deviation is easy to occur, which affects the protection performance and operation reliability of the lightning arrester. (3) unable to realize full-phase protection, and there is a lightning protection dead zone. Limited by the narrow space arrangement between the conductors of compact line and multi-circuit line on the same tower, due to the limitation of volume and installation mode, the installation of existing lightning arrester is only limited to the lower phase or simple single-circuit line, and cannot be installed and applied on the middle and upper phase conductors, which cannot provide full-phase lightning protection for the entire transmission line, so that the lightning hazard problem cannot be effectively solved for a long time.

[0004] In summary, the existing 500kV AC line lightning arrester has inherent defects in structure design, installation process and applicability, which seriously restricts the comprehensive popularization and application, and makes it difficult to establish a systematic lightning protection system. Therefore, it is urgent to develop a 500kV high gradient AC line lightning arrester with compact structure, miniaturization, light weight and convenient installation, to solve the technical bottleneck of existing technology and realize the full-range and dead-zone-free lightning protection of transmission line. UTILITY MODEL CONTENT

[0005] The utility model provides a 500kV high gradient AC line lightning arrester suitable for full-phase installation and use of 500kV AC transmission line, which has simple structure, small size, light weight and excellent performance.

[0006] The utility model aims to realize the following technical scheme:

[0007] The utility model provides a high gradient transmission line lightning arrester, include: insulating base plate for fixing lightning arrester on the tower,

[0008] Lightning arrester body, the first end of lightning arrester body is connected insulating base plate,

[0009] Electrode ring, by upper electrode ring and lower electrode ring are composed, the air gap electrode structure is formed between upper electrode ring and lower electrode ring, the second end of lightning arrester body is connected upper electrode ring,

[0010] Fixing assembly is used for fixing lightning arrester on transmission conductor, the first end of fixing assembly is connected lower electrode ring, and the second end is connected transmission conductor,

[0011] Lightning arrester body is composed of 2 lightning arrester body elements in series, and the high gradient zinc oxide resistor sheet with voltage gradient 250~320V / mm is encapsulated in the lightning arrester body element.

[0012] Further, the insulating base plate includes a connecting plate and at least two pairs of insulating spacers, the lower surface of the connecting plate is used to fix the lightning arrester body element, and the upper surface is connected to the mounting bracket on the tower through a fastening bolt; the connecting plate and the mounting bracket are isolated by the insulating spacers.

[0013] Further, the insulating spacers are made of polytetrafluoroethylene.

[0014] Further, the height of the lightning arrester body element is 1350~1450mm, and the outside is wrapped by a silicon rubber umbrella skirt; the silicon rubber umbrella skirt is composed of large and small umbrellas arranged alternately, the diameter of the large umbrella is 220~250mm, the diameter of the small umbrella is 190~220mm, and the total creepage distance of the umbrella skirt is not less than 9820mm.

[0015] Further, the height of the high gradient zinc oxide resistor sheet is 22~27mm, the diameter is 70~80mm, 75~85 pieces are encapsulated in a single lightning arrester body element, the square wave withstand capability is not less than 1200A, and the lightning repeated transfer charge is not less than 1.3C.

[0016] Further, it further includes an adjusting assembly located between the lightning arrester body and the upper electrode ring for adjusting the air gap distance of the electrode ring, the first end of the adjusting assembly is connected to the second end of the lightning arrester body, and the second end is connected to the upper electrode ring.

[0017] The adjusting assembly is composed of two pairs of L-shaped plates, each pair of L-shaped plates comprises a fixedly connected upper L-shaped plate and lower L-shaped plate, and 4-6 adjusting holes are formed on each L-shaped plate along the length direction thereof.

[0018] Further, the upper electrode ring and the lower electrode ring are circular rings, made of aluminum alloy, and have a pipe diameter of 50-100mm.

[0019] The long side width of the upper electrode ring is 1000-2200mm, and the short side width is 300-500mm.

[0020] The long side width of the lower electrode ring is 1100-1500mm, and the short side width is 500-700mm.

[0021] The lower electrode ring is completely located in the vertical projection range of the upper electrode ring, and the parallelism deviation between the end face of the lower electrode ring and the power transmission conductor is within ±15°.

[0022] Further, the fixing assembly is fixedly connected with two upper sub-conductors among the four split conductors of the power transmission conductor.

[0023] Further, the fixing assembly comprises a fixing plate and a U-shaped clamp, the lower electrode ring is fixed on one side of the fixing plate, and the power transmission conductor is fixed on the other side of the fixing plate through the U-shaped clamp.

[0024] Further, the overall structure of the lightning arrester is configured to be suitable for full-phase installation on the upper phase, middle phase and lower phase of the 500kV AC power transmission line.

[0025] Compared with the prior art, the utility model has the beneficial effects that:

[0026] The high-gradient transmission line lightning arrester provided by the utility model has internal encapsulation of high-gradient zinc oxide resistance sheets, the number of lightning arrester body elements is reduced from three to two, the structural size is smaller, and the weight is lighter; lightning arrester installation design and on-site construction are simpler, the problem that a 500kV lightning arrester can be installed by using a simpler installation support is solved; the lightning arrester adopts an air gap electrode structure composed of an upper electrode ring and a lower electrode ring, the discharge stability is higher, the lightning arrester is not affected by external environments such as pollution and rain and snow, the traditional installation mode of fixing the lower electrode ring by using a spacer rod is abandoned, a more convenient fixing assembly is designed, the position on the conductor wire can be adjusted conveniently, and the angle between the upper electrode ring and the lower electrode ring is adjusted, thereby the upper and lower electrode rings are aligned; through overall collaborative design of the high-gradient zinc oxide resistance sheets inside the lightning arrester, the external structural size and the installation support, the lightning arrester has the advantages of simple structure, small size, light weight, excellent performance and convenient installation, is suitable for full-phase installation and use of transmission line tower poles, and especially can realize full-phase lightning protection for transmission lines with limited installation space such as upper phases of multi-circuit tower poles on the same tower and compact tower poles. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a structure schematic view of the high-gradient transmission line lightning arrester of the utility model;

[0028] Figure 2 It is an insulation base connecting plate structure schematic view of the high-gradient transmission line lightning arrester of the utility model;

[0029] Figure 3 It is an insulation base installation schematic view of the high-gradient transmission line lightning arrester of the utility model;

[0030] Figure 4 It is a structure schematic view of the adjusting assembly of the high-gradient transmission line lightning arrester of the utility model;

[0031] Figure 5 It is a structure schematic view of the fixing assembly of the high-gradient transmission line lightning arrester of the utility model;

[0032] Figure 6 It is an installation schematic view of the high-gradient transmission line lightning arrester of the utility model;

[0033] 1, insulation base; 11, connecting plate; 111, fixing hole; 112, connecting hole; 12, insulation gasket; 2, lightning arrester body; 3, adjusting assembly; 31, upper L-shaped plate; 32, lower L-shaped plate; 33, adjusting hole; 4, electrode ring; 41, upper electrode ring; 42, lower electrode ring; 5, fixing assembly; 51, fixing plate; 52, U-shaped clamp; 6, installation support; 7, transmission conductor wire. DETAILED DESCRIPTION

[0034] Exemplary embodiments of the present application will be described in greater detail below with reference to the accompanying drawings. While exemplary embodiments of the present application are illustrated, it is understood that the present application can be carried out in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present application to those skilled in the art.

[0035] As shown in Figure 1 The high-gradient transmission line arrester provided by the present application comprises:

[0036] An insulating base 1 is used to fix the arrester on a tower;

[0037] An arrester body 2, a first end of the arrester body 2 is connected to the insulating base 1;

[0038] An electrode ring 4, which is composed of an upper electrode ring 41 and a lower electrode ring 42, an air gap electrode structure is formed between the upper electrode ring 41 and the lower electrode ring 42, and a second end of the arrester body 2 is connected to the upper electrode ring 41;

[0039] A fixing assembly 5 is used to fix the arrester on a transmission conductor 7, a first end of the fixing assembly 5 is connected to the lower electrode ring 42, and a second end of the fixing assembly 5 is connected to the transmission conductor 7;

[0040] The arrester body 2 is composed of two arrester body elements in series, and a high-gradient zinc oxide resistor with a voltage gradient of 250-320 V / mm is encapsulated in the arrester body elements.

[0041] The high-gradient transmission line arrester provided by the present application encapsulates a high-gradient zinc oxide resistor inside, the number of arrester body elements is reduced from three to two, the structure size is smaller, and the weight is lighter; the arrester installation design and on-site construction are more convenient, and the problem that a 500kV arrester can be installed by using a simpler installation support is solved.

[0042] As shown in Figure 2 , 3 The insulating base 1 comprises a connecting plate 11 and four pairs of insulating gaskets 12, each pair of insulating gaskets 12 comprises an upper insulating gasket and a lower insulating gasket arranged oppositely, the four pairs of insulating gaskets form a circular structure, the lower surface of the connecting plate 11 is used to fix the arrester body 2, and the upper surface is connected to the installation support 6 on the tower through a fastening bolt; the four pairs of insulating gaskets 12 are arranged between the connecting plate 11 and the installation support 6, and the connecting plate 11 and the installation support 6 are isolated through the insulating gaskets 12. Figure 6As shown, the mounting bracket 6 is a long strip-shaped angle steel, one end of which is fixed on the tower, and a plurality of mounting holes are arranged on the long strip-shaped angle steel to adjust the installation position of the lightning arrester. The connecting plate 11 is provided with a fixing hole 111 and a connecting hole 112, the fixing hole 111 is used to fixedly connect the connecting plate 11 and the mounting bracket 6, and the connecting hole 112 is used to fixedly connect the lightning arrester body 2 and the connecting plate 11. The first end of the insulating base 1 is connected with the first end of the lightning arrester body 2, and the second end of the insulating base 1 is connected with the tower through the mounting bracket 6, so as to realize the installation and application of the lightning arrester on the tower.

[0043] The lightning arrester body 2 is composed of two lightning arrester body elements in series. The height of the lightning arrester body element is 1350-1450mm, the inside is packaged with high gradient zinc oxide varistor, and the outside is wrapped with a silicon rubber shed with large and small umbrella structures. The voltage gradient of the zinc oxide varistor is 250-320V / mm, the height is 22-27mm, the diameter is 70-80mm, the number is 75-85 pieces, the square wave resistance is ≥1200A, and the lightning repeated transfer charge is ≥1.3C. The silicon rubber shed is composed of a series of large and small umbrellas, which are arranged alternately in the order of large and small umbrellas, the number of large umbrellas is 18-23, the number of small umbrellas is 18-23, the diameter of large umbrella is 220-250mm, the diameter of small umbrella is 190-220mm, and the creepage distance of the silicon rubber shed is ≥9820mm. In this embodiment, 82 pieces of zinc oxide varistor with a voltage gradient of 300V / mm are packaged in each element, the height is 22.5mm, the diameter is 78mm, and the element height is about 1400mm. The external silicon rubber shed adopts an alternating structure of large and small umbrellas, the diameter of large umbrella is 235mm, the diameter of small umbrella is 205mm, the total creepage distance reaches 10000mm, and the excellent anti-pollution flashover capability is ensured.

[0044] As a preferred embodiment of the present embodiment, the lightning arrester further comprises an adjusting assembly, the adjusting assembly is located between the lightning arrester body and the upper electrode ring, and is used to adjust the air gap distance of the electrode ring, the first end of the adjusting assembly is connected with the second end of the lightning arrester body, and the second end is connected with the upper electrode ring; the adjusting assembly 3 is composed of two pairs of L-shaped plates, each pair of L-shaped plates includes an upper L-shaped plate 31 and a lower L-shaped plate 32 fixedly connected, and 4-6 adjusting holes 33 are arranged on each L-shaped plate at a certain distance, the matching positions of the adjusting holes 33 of the upper L-shaped plate 31 and the lower L-shaped plate 32 are adjusted, the length of the adjusting assembly 3 is adjusted, and then the distance between the electrode rings is adjusted. As Figure 1 and Figure 4As shown in the embodiment, the adjusting assembly 3 is assembled by the upper L-shaped plate 31 and the lower L-shaped plate 32 through bolts. Five adjusting holes 33 are formed in each of the two plates. By changing the position of the bolt in different hole positions, the length of the assembly can be adjusted steplessly, so that the air gap distance between the upper electrode ring 41 and the lower electrode ring 42 can be accurately set and stabilized at the designed distance value.

[0045] The upper electrode ring 41 is fixed to the side of the lightning arrester body 2 through the adjusting assembly 3 and serves as a low-voltage side electrode. The lower electrode ring 42 is installed on one side of the power transmission conductor 7 through the fixing assembly 5 and serves as a high-voltage side electrode. The upper electrode ring 41 and the lower electrode ring 42 can be designed in a circular ring structure and are made of aluminum alloy. The pipe diameter of the electrode ring is 50-100 mm. The long side width of the upper electrode ring 41 is 1000-2200 mm, and the short side width is 300-500 mm. The long side width of the lower electrode ring 42 is 1100-1500 mm, and the short side width is 500-700 mm. The lower electrode ring 42 is completely within the vertical projection range of the upper electrode ring 41. The end surface of the lower electrode ring 42 is arranged in parallel with the power transmission conductor 7, and the deviation angle is controlled within ±15°.

[0046] As shown in the embodiment, Figure 5 The fixing assembly 5 includes a fixing plate 51 and a U-shaped clamp 52. The lower electrode ring 42 is fixed to one side of the fixing plate 51. The power transmission conductor 7 is fixed to the other side of the fixing plate 51 through the U-shaped clamp 52. The U-shaped clamp 52 can be conveniently clamped and locked on the upper two sub-conductors of the four-split conductor. During installation, the worker can first slightly loosen the clamp, adjust the lower electrode ring 42 to the best alignment position according to the position of the upper electrode ring 41, and finally tighten the clamp. This design completely eliminates the complicated but necessary spacer in the traditional scheme.

[0047] Figure 6 The installation effect of the utility model on the tower is shown. Due to the compact size and lightweight design, it can be safely and conveniently installed on any phase tower, including the most narrow space of the middle phase and the upper phase, so as to realize the all-around and dead-angle lightning protection of the power transmission line.

[0048] The core of the utility model lies in that the miniaturization of the body is realized through the high-gradient resistance sheet (2-section series connection), and the installation and adjustment of the electrode ring are optimized through the adjusting assembly 3 and the special fixing assembly 5. Through the collaborative design of the high-gradient resistance sheet, the two-section body element, the adjustable assembly and the special fixing assembly 5, the technical problems of the miniaturization, installation convenience and full-phase applicability of the 500kV line lightning arrester are systematically solved, and the utility model has remarkable practical value and popularization prospect.

[0049] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and is not intended to limit the present application, although the foregoing embodiments of the present application has been described in detail, for the skilled in the art, it still can be modified, or for part of the technical features of the equivalent replacement, the spirit and principles of the present application, made any modification, equivalent replacement, improvement, etc., should be included within the scope of the present application.

Claims

1. A high gradient transmission line arrester, characterized by, The application relates to a lightning arrester, which comprises the following parts: an insulating base (1) for fixing the lightning arrester on a tower; a lightning arrester body (2), the first end of which is connected with the insulating base (1); an electrode ring (4) composed of an upper electrode ring (41) and a lower electrode ring (42), an air gap electrode structure being formed between the upper electrode ring (41) and the lower electrode ring (42), and the second end of the lightning arrester body (2) being connected with the upper electrode ring (41); a fixing assembly (5) for fixing the lightning arrester on a power transmission conductor (7), the first end of the fixing assembly (5) being connected with the lower electrode ring (42), and the second end being connected with the power transmission conductor (7); the lightning arrester body (2) is composed of two lightning arrester body elements connected in series, and the lightning arrester body elements are internally encapsulated with high-gradient zinc oxide varistors with a voltage gradient of 250-320 V / mm.

2. The high gradient power line arrester of claim 1, wherein, The insulating base (1) comprises a connecting plate (11) and at least two pairs of insulating gaskets (12), the lower surface of the connecting plate (11) is used for fixing the lightning arrester body (2), the upper surface is connected with a mounting bracket (6) on the tower through fastening bolts, and the connecting plate (11) and the mounting bracket (6) are isolated through the insulating gaskets (12).

3. The high gradient power line arrester of claim 2, wherein, The material of the insulating gaskets (12) is polytetrafluoroethylene.

4. The high gradient power line arrester of claim 1, wherein, The height of the lightning arrester body element is 1350-1450 mm, and the outside is wrapped with a silicon rubber umbrella skirt; the silicon rubber umbrella skirt is composed of alternately arranged large and small umbrellas, the diameter of the large umbrella is 220-250 mm, the diameter of the small umbrella is 190-220 mm, and the total creepage distance of the umbrella skirt is not less than 9820 mm.

5. The high gradient power line arrester of claim 1, wherein, The height of the high-gradient zinc oxide varistor is 22-27 mm, the diameter is 70-80 mm, 75-85 pieces of the high-gradient zinc oxide varistor are encapsulated in a single lightning arrester body element, the square wave resistance capacity is not less than 1200 A, and the lightning repeated transfer charge is not less than 1.3 C.

6. The high gradient power line arrester of claim 1, wherein, The application further comprises: an adjusting assembly (3) located between the lightning arrester body (2) and the upper electrode ring (41) and used for adjusting the air gap distance of the electrode ring (4), the first end of the adjusting assembly (3) being connected with the second end of the lightning arrester body (2), and the second end being connected with the upper electrode ring (41); the adjusting assembly (3) is composed of two pairs of L-shaped plates, each pair of L-shaped plates comprising a fixedly connected upper L-shaped plate (31) and a lower L-shaped plate (32); and 4-6 adjusting holes (33) are formed on each L-shaped plate along the length direction of the L-shaped plate.

7. The high gradient power line arrester of claim 1, wherein, The upper electrode ring (41) and the lower electrode ring (42) are circular rings, the material is aluminum alloy, and the pipe diameter is 50-100 mm; the long side width of the upper electrode ring (41) is 1000-2200 mm, and the short side width is 300-500 mm; the long side width of the lower electrode ring (42) is 1100-1500 mm, and the short side width is 500-700 mm; the lower electrode ring (42) is completely located in the vertical projection range of the upper electrode ring (41), and the parallelism deviation between the end face of the lower electrode ring (42) and the power transmission conductor is within + / - 15 degrees.

8. The high gradient power line arrester of claim 1, wherein, The fixed assembly (5) is fixedly connected with two upper sub-conductors in the four-split conductors of the power transmission conductor (7).

9. The high gradient power line arrester of claim 8, wherein, The fixed assembly (5) comprises a fixed plate (51) and a U-shaped clamp (52), the lower electrode ring (42) is fixed on one side of the fixed plate (51), and the power transmission conductor (7) is fixed on the other side of the fixed plate (51) through the U-shaped clamp (52).

10. The high gradient power line arrester of any one of claims 1 to 9, wherein, The whole structure of the lightning arrester is configured to be suitable for full-phase installation on the upper phase, the middle phase and the lower phase of the 500kV AC power transmission line.

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