Insulated enclosed lightning arrester

Abstract

The utility model relates to an insulated closed lightning arrester which comprises a lightning arrester body, the lower end part of the lightning arrester body is provided with a wiring end, the wiring end is connected with a lead, and one end, far away from the wiring end, of the lightning arrester body is connected with a grounding end; and the surfaces of the lightning arrester body, the wiring terminal and the lead wire are coated with an integrated insulating jacket. The grounding terminal is provided with a grounding terminal, and the grounding terminal is connected with a grounding wire or a counter. The lightning arrester body and the connecting lead are wrapped in an all-insulation mode, the problem that due to the fact that a wiring end of a conventional lightning arrester is exposed, the distance between an electrified part and an iron tower, an insulator and a grounding wire is difficult to adjust when the lightning arrester is installed is solved, the external insulation creepage distance is 2150 mm and is far larger than that of the conventional lightning arrester by 1340 mm, and the lightning arrester can be used for areas with high altitude, large dirt and multiple ions in air and water vapor. And a surface flashover fault caused by insufficient external insulation creepage distance of the lightning arrester is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to power line technical field, concretely is a kind of insulating closed lightning arrester. BACKGROUND

[0002] Lightning arrester is a kind of electrical appliance for protecting electrical equipment from high transient overvoltage and limiting the time of current flow.

[0003] The composite insulation sheath lightning arrester widely used in 35kV overhead power line in China has the following parameters: rated voltage 51kV, power frequency continuous operating voltage 40.8kV, nominal lightning discharge current 5000A, 2ms square wave through-flow capacity 400A, residual voltage under lightning impulse current 134kV, and nominal creepage distance 1340mm.

[0004] The lightning current release capacity of conventional parameter lightning arrester used in new energy power station is insufficient, the lightning arrester has high chopping voltage level, and the lightning arrester body has insufficient creepage distance.

[0005] Once a new lightning arrester with longer creepage distance, larger through-flow capacity and stronger thermal stability is developed, it can be applied to new energy power generation 35kV special line lightning arrester in thunderstorm frequent areas such as high mountains and plateaus, which can avoid the breakdown of electrical equipment caused by insufficient lightning current release of 35kV conventional lightning arrester, and avoid the grounding fault trip of power collection line caused by the through flashover of lightning arrester, thereby recovering a large amount of loss for new energy power station. SUMMARY

[0006] In view of the deficiencies of the prior art, the utility model provides an insulating closed lightning arrester, which has the advantages of effectively releasing high-intensity lightning current and solves the problem that conventional lightning arrester cannot effectively cope with high-intensity lightning impact in thunderstorm frequent areas.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0008] An insulating closed lightning arrester includes a lightning arrester body, a wiring terminal connected to the lower end of the lightning arrester body, a lead connected to the wiring terminal, and a grounding terminal connected to one end of the lightning arrester body away from the wiring terminal; the surface of the lightning arrester body, the wiring terminal and the lead is wrapped with an integrated insulation sheath.

[0009] The grounding terminal is provided with a grounding terminal, and the grounding terminal is connected to a grounding wire or a counter.

[0010] The upper part of the grounding terminal is fixedly connected to a mounting seat, and the upper part of the mounting seat is provided with a mounting end.

[0011] The middle part of the mounting end is provided with a mounting hole with a diameter of 18mm.

[0012] The insulating outer cover is a full-insulation sealing type structure of a silicone rubber outer cover.

[0013] The total length of the lightning arrester body, the wiring end and the grounding end is 560 mm.

[0014] The outer wall of the lightning arrester body is provided with a grading ring, and the grading ring is in the shape of a circular truncated cone.

[0015] The grading ring on the lightning arrester body comprises a short-diameter ring and a long-diameter ring, the diameter of the short-diameter ring is between 130 mm and 160 mm, the diameter of the long-diameter ring is between 170 mm and 190 mm, and the short-diameter ring and the long-diameter ring are staggered.

[0016] Compared with the prior art, the technical scheme of the application has the following beneficial effects:

[0017] The lightning arrester body and the lead wire are fully insulated, thereby avoiding the problem of adjustment of the distance between the live parts of the lightning arrester during installation and a tower, an insulator and a grounding wire due to the exposure of the wiring end of a conventional lightning arrester, the outer insulation creepage distance is 2150 mm, which is much larger than the 1340 mm of a conventional lightning arrester, and the lightning arrester can avoid the surface flashover failure caused by insufficient outer insulation creepage distance in areas with high altitude, heavy pollution and high ion content in air water vapor.

[0018] The lightning current withstand peak value of the lightning arrester is 10000 amperes, the 2 ms square wave through current is 80 amperes, and the thermal stability is more than 4 times that of a conventional lightning arrester, thereby solving the problems of lightning arrester burst and equipment damage caused by insufficient thermal stability of a conventional lightning arrester in high thunderstorm areas and areas with high lightning discharge intensity.

[0019] The technical problems to be solved in the background art are solved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Fig. 1 It is a half-sectional view of the lightning arrester body of the utility model structure.

[0021] Fig. 2 It is a front view of the lightning arrester body of the utility model structure.

[0022] In the figure: 1, lightning arrester body; 2, wiring end; 3, lead wire; 4, insulating outer cover; 5, grounding end; 51, grounding terminal; 6, mounting seat; 7, mounting end; 8, mounting hole; 9, short-diameter ring; 10, long-diameter ring. DETAILED DESCRIPTION

[0023] Please refer to Figs. 1-2 In the embodiment, the insulating closed lightning arrester comprises a lightning arrester body 1, the lower end of the lightning arrester body 1 is connected with a wiring end 2, the wiring end 2 is connected with a lead wire 3, and the end of the lightning arrester body 1 away from the wiring end 2 is connected with a grounding end 5; the surfaces of the lightning arrester body 1, the wiring end 2 and the lead wire 3 are wrapped with an integral insulating outer cover 4.

[0024] The grounding end 5 is provided with a grounding terminal 51 connected to a grounding wire or a counter.

[0025] The mounting seat 6 is fixedly connected to the upper portion of the grounding end 5, and the mounting end 7 is arranged on the upper portion of the mounting seat 6.

[0026] The mounting hole 8 with a diameter of 18 mm is arranged in the middle portion of the mounting end 7.

[0027] The insulating outer sleeve 4 is a full-insulation sealing type structure of a silicone rubber outer sleeve.

[0028] The total length of the arrester body 1, the wiring end 2 and the grounding end 5 is 560 mm.

[0029] The equalizing ring is arranged on the outer wall of the arrester body 1 and is in the shape of a circular truncated cone.

[0030] The equalizing ring on the arrester body 1 includes a short-diameter ring 9 and a long-diameter ring 10, the diameter of the short-diameter ring 9 is between 130 mm and 160 mm, the diameter of the long-diameter ring 10 is between 170 mm and 190 mm, and the short-diameter ring 9 and the long-diameter ring 10 are staggered.

[0031] The design of the equalizing ring in the shape of a circular truncated cone can more effectively disperse voltage, improve the voltage bearing capacity of the arrester and enhance the performance of the arrester.

[0032] The design of the staggered short-diameter ring and long-diameter ring further optimizes the voltage distribution effect of the equalizing ring, improves the overall performance and stability of the arrester. At the same time, this design also helps to improve the mechanical strength and durability of the arrester.

[0033] Specifically, the 35 kV arrester is wrapped with the full-insulation wrapping of the lead wire 3, thereby avoiding the difficulty in adjusting the distance between the live parts of the arrester during installation and the tower, insulator and grounding wire (the distance is required to be more than 1 m from the tower and 400 mm from other parts).

[0034] The arrester adopts the full-insulation sealing type structure of the silicone rubber insulating outer sleeve 4, has a rated voltage of 51 kV, a power frequency continuous working voltage of 40.8 kV, a nominal lightning discharge current of 10,000 A, a 2 ms square wave through-flow capacity of 800 A, a residual voltage under lightning impulse current of 125 kV and a nominal creepage distance of 2,160 mm.

[0035] The working principle of the above embodiment is that the lightning arrester is hung at the cross arm position of the iron tower through the mounting end 7, the wiring end 2 is firmly connected to the power line conductor, and the grounding wire or the lightning arrester counter is reliably connected to the grounding terminal (51) of the lightning arrester. In normal operation, the lightning arrester is in a high resistance state, the power line conductor connected to the lightning arrester is 35 kV, the current flowing through the core of the lightning arrester is ≤50 μA, at this time, the conductor is in an open-circuit state with the iron tower and the ground. When the overvoltage (overvoltage level greater than 73 kV, including lightning overvoltage and internal overvoltage) higher than a certain limit value appears on the power line conductor connected to the lightning arrester, the lightning arrester quickly conducts and presents a low resistance state. At this time, the conductor forms a path with the iron tower and the ground through the lightning arrester, and the fluctuating energy (lightning current in the conductor) appearing on the conductor is released to the ground. When the voltage in the conductor is lower than or equal to 125 kV, the lightning arrester returns to a high resistance state, at this time, the conductor returns to an open-circuit state with the iron tower and the ground.

Claims

1. An insulated and enclosed surge arrester, comprising an arrester body (1), a terminal (2) connected to the lower end of the arrester body (1), a lead wire (3) connected to the terminal (2), and a grounding terminal (5) connected to the end of the arrester body (1) away from the terminal (2), characterized in that: The surface of the surge arrester body (1), terminal (2) and lead wire (3) is covered with an integrated insulating jacket (4).

2. The insulated and enclosed surge arrester according to claim 1, characterized in that: Grounding terminal (5) is provided with grounding terminal (51), and grounding terminal (51) is connected to grounding wire or counter.

3. The insulated and enclosed surge arrester according to claim 1, characterized in that: The grounding terminal (5) is fixedly connected to the mounting base (6), and the mounting base (6) is provided with the mounting end (7).

4. The insulated and enclosed surge arrester according to claim 3, characterized in that: The mounting end (7) has a mounting hole (8) with a diameter of 18 mm in the middle.

5. An insulated and enclosed surge arrester according to claim 1, characterized in that: The insulating jacket (4) is a fully insulated and sealed structure with a silicone rubber outer sheath.

6. The insulated and enclosed surge arrester according to claim 1, characterized in that: The total length of the surge arrester body (1), terminal (2) and grounding terminal (5) is 560 mm.

7. The insulated and enclosed surge arrester according to claim 1, characterized in that: The outer wall of the surge arrester body (1) is provided with an equalizing ring, which is frustum-shaped.

8. The insulated and enclosed surge arrester according to claim 1, characterized in that: The equalizing ring on the arrester body (1) includes a short diameter ring (9) and a long diameter ring (10). The diameter of the short diameter ring (9) is between 130 mm and 160 mm, and the diameter of the long diameter ring (10) is between 170 mm and 190 mm. The short diameter ring (9) and the long diameter ring (10) are distributed alternately.

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