Tank-type lightning arrester based on zero-carbon environment-friendly gas insulation

Abstract

The invention discloses a tank-type lightning arrester based on zero-carbon environment-friendly gas insulation, and relates to the technical field of electric power, the tank-type lightning arrester comprises a tank body, an upper core body and a lower core body are arranged in the tank body, the upper core body and the lower core body are connected in series and mounted in an insulating cylinder, an insulator is mounted at the top of the tank body, a conducting rod is arranged at the lower part of the insulator, and an upper shielding cover is mounted outside the conducting rod; the top of the upper core body is connected with a conducting rod through a shielding base, a protective cap is installed on the insulator, the bottom of the lower core body is fixed to the bottom of an inner cavity of the tank body, a voltage-sharing shielding cover is arranged on the insulating cylinder and comprises an upper ring and a lower ring, the upper ring and the lower ring are connected through a plurality of telescopic rods, the upper ring is connected with an upper shielding base, and an inflation valve is arranged on the tank body. The inner cavity of the tank body is filled with clean air, and compared with the original SF6 insulation, the clean air is free of fluorine, free of carbon and purely green; the voltage-sharing shielding case is designed to be of a telescopic structure, is suitable for lightning arresters of different models, and achieves the optimal voltage-sharing effect.

Description

Technical Field

[0001] The invention relates to the field of electric power technology, in particular to a tank-type lightning arrester based on zero-carbon environmentally friendly gas insulation. Background Art

[0002] A lightning arrester is an electrical device used to protect electrical equipment from high transient overvoltage hazards and to limit the follow-on time and often also limit the follow-on value. The main material of the lightning arrester is zinc oxide. The lightning arrester is usually connected between the grid conductor and the ground wire or connected next to the electrical winding or between the conductors. Lightning arresters are sometimes also called overvoltage protectors. They are mainly used to protect power systems from overvoltages such as lightning or operational shocks to ensure the safe operation of power systems. Tank lightning arresters are a commonly used type of lightning arrester. The tank lightning arrester is a lightning arrester made into a tank structure and is widely used in SF6 enclosed switchgear (GIS).

[0003] At present, most tank arresters for GIS are insulated with SF6, and a small number are insulated with a mixed gas of SF6 and N2. The pressure inside the tank is 0.5 MPa, and SF6 gas is a very strong greenhouse gas, and its greenhouse effect is 23,900 times that of CO2 gas, which is easy to cause air pollution; on the other hand, different types of arresters with the same voltage level generally use the same voltage-equalizing shielding cover, but the voltage-equalizing shielding cover is not completely applicable, which leads to a large potential distribution coefficient of some types of arresters, which accelerates the aging of the resistor and seriously reduces the service life of the arrester. Summary of the invention

[0004] In order to overcome the defects in the prior art that the air pollution is easily caused and the voltage-equalizing shield is not completely applicable, the present invention provides a tank-type lightning arrester based on zero-carbon environmentally friendly gas insulation.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a tank type lightning arrester based on zero-carbon environmentally friendly gas insulation, including a tank body, an upper core body and a lower core body are arranged in the tank body, the upper core body and the lower core body are installed in series in an insulating cylinder, an insulator is installed on the top of the tank body, a conductive rod is arranged at the lower part of the insulator, an upper shielding cover is installed on the outside of the conductive rod, the top of the upper core body is connected with the conductive rod through a shielding seat, a protective cap is installed on the insulator, the bottom of the lower core body is fixed to the bottom of the inner cavity of the tank body, a voltage-equalizing shielding cover is provided on the insulating cylinder, the voltage-equalizing shielding cover includes an upper ring and a lower ring, the upper ring and the lower ring are connected by a plurality of telescopic rods, the upper ring is connected to the upper shielding seat, an inflation valve is provided on the tank body, and the inner cavity of the tank body is filled with clean air.

[0006] As a further improvement of the present invention, an accessory box is provided on the outer side of the tank body, and a low-voltage outlet terminal is provided in the accessory box. One end of the low-voltage outlet terminal is connected to the monitor through a wire, and the other end of the low-voltage outlet terminal is connected to the lower core body through a wire.

[0007] As a further improvement of the present invention, the accessory box is installed on the tank body through a grounding bar, and the monitor is connected to the grounding bar through a wire.

[0008] As a further improvement of the present invention, the insulator is an arc-shaped structure protruding toward the outside of the tank body.

[0009] As a further improvement of the present invention, the protective cap is connected to the insulator via bolts.

[0010] As a further improvement of the present invention, a mounting groove for fixing the insulating cylinder is provided at the bottom of the inner cavity of the tank body, and a flange for fixing the lower core body is provided on the mounting groove.

[0011] As a further improvement of the present invention, an explosion-proof device is provided on the tank body.

[0012] As a further improvement of the present invention, the tank body is made of aluminum.

[0013] Compared with the prior art, the present invention has the following beneficial effects: in this solution, the inner cavity of the tank is filled with clean air. Compared with the original SF6 insulation, the clean air is fluorine-free and carbon-free and is purely green; the voltage-equalizing shielding cover is designed as a retractable structure to adapt to different types of lightning arresters and achieve the optimal voltage-equalizing effect, minimize the potential distribution unevenness coefficient, slow down the aging of the resistor, and increase the service life of the lightning arrester. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0015] Figure 1 The present invention is a schematic structural diagram of a tank type lightning arrester based on zero-carbon environmentally friendly gas insulation.

[0016] Figure 2 It is a schematic structural diagram of the voltage-equalizing shielding cover of the present invention.

[0017] In the figure: 1. protective cap; 2. insulator; 3. conductive rod; 4. upper shielding cover; 5. shielding seat; 6. upper core; 7. equalizing shielding cover; 71. upper ring; 72. telescopic rod; 73. lower ring; 8. insulating cylinder; 9. lower core; 10. explosion-proof device; 11. wire; 12. tank; 13. monitor; 14. accessory box; 15. low-voltage outlet terminal; 16. grounding bar; 17. inflation valve. DETAILED DESCRIPTION

[0018] In order to make the technical solution and beneficial effects of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0019] Reference Figure 1The embodiment of the present invention discloses a tank type lightning arrester based on zero-carbon environmentally friendly gas insulation, including a tank body 12, an upper core body 6 and a lower core body 9 are arranged in the tank body 12, the upper core body 6 and the lower core body 9 are installed in series in an insulating tube 8, an insulator 2 is installed on the top of the tank body 12, a conductive rod 3 is arranged at the lower part of the insulator 2, an upper shielding cover 4 is installed outside the conductive rod 3, the top of the upper core body 6 is connected to the conductive rod 3 through a shielding seat 5, a protective cap 1 is installed on the insulator 2, the bottom of the lower core body 9 is fixed to the bottom of the inner cavity of the tank body 12, a voltage-equalizing shielding cover 7 is arranged on the insulating tube 8, the voltage-equalizing shielding cover 7 is connected to the shielding seat 5, an air filling valve 17 is arranged on the tank body 12, and the inner cavity of the tank body 12 is filled with clean air.

[0020] Among them, an accessory box 14 is provided on the outer side of the tank body 12, and a low-voltage outlet terminal 15 is provided in the accessory box 14. One end of the low-voltage outlet terminal 15 is connected to the monitor 13 through the wire 11, and the other end of the low-voltage outlet terminal 15 is connected to the lower core body 9 through the wire 11. The accessory box 14 is installed on the tank body 12 through the grounding bar 16, and the monitor 13 is connected to the grounding bar 16 through the wire 11. The monitor 13 in the accessory box 14 can monitor the operating status of the lightning arrester, which is convenient for timely detection of abnormal conditions and rapid troubleshooting.

[0021] The bottom of the inner cavity of the tank body 12 is provided with a mounting groove for fixing the insulating cylinder 8 , and the mounting groove is provided with a flange for fixing the lower core body 9 , thereby ensuring the stability of the upper core body 6 and the lower core body 9 .

[0022] Reference Figure 2 The pressure-equalizing shielding cover 7 includes an upper ring 71 and a lower ring 73 . The upper ring 71 and the lower ring 73 are connected by a plurality of telescopic rods 72 . The upper ring 71 is connected to the shielding seat 5 .

[0023] The inner cavity of the tank 12 is filled with clean air at a pressure of 0.8 MPa. Compared with the original SF6 insulation, the pressurized clean air is suitable. The pressure of the tank can fully adapt to it, and the cost increase can be completely ignored. The clean air is fluorine-free and carbon-free, and is purely green. The equalizing shield 7 is designed as a retractable structure to adapt to different types of arresters and achieve the best equalizing effect. The potential distribution unevenness coefficient is reduced to the greatest extent, the aging of the resistor is slowed down, and the service life of the arrester is increased.

[0024] The insulator 2 is an arc-shaped structure protruding toward the outside of the tank body 12. The protective cap 1 is connected to the insulator 2 by bolts, so that the electric field and potential distribution at the connection between the insulator 2 and the tank body 12 are relatively uniform, ensuring that each joint has good electrical performance.

[0025] The tank body 12 is made of aluminum, which is light, easy to install and wire, and has a good shielding effect. An explosion-proof device 10 is provided on the tank body 12. The explosion-proof device 10 can quickly release the gas with abnormally high pressure in the inner cavity of the tank body 12 to avoid explosion accidents.

[0026] It should be understood that the specific embodiments described herein are only used to understand the present invention and are not used to limit the present invention. All other embodiments obtained by those skilled in the art without making any creative work are within the scope of protection of the present invention.

Claims

1. A tank type lightning arrester based on zero-carbon environmentally friendly gas insulation, characterized by: The invention comprises a tank body (12), wherein an upper core body (6) and a lower core body (9) are arranged in the tank body (12), the upper core body (6) and the lower core body (9) are installed in series in an insulating cylinder (8), an insulator (2) is installed on the top of the tank body (12), a conductive rod (3) is arranged at the bottom of the insulator (2), an upper shielding cover (4) is installed outside the conductive rod (3), the top of the upper core body (6) is connected to the conductive rod (3) through a shielding seat (5), and a conductive rod (3) is installed on the insulator (2). A protective cap (1) is provided, the bottom of the lower core (9) is fixed to the bottom of the inner cavity of the tank body (12), a pressure-equalizing shielding cover (7) is provided on the insulating cylinder (8), the pressure-equalizing shielding cover (7) comprises an upper ring (71) and a lower ring (73), the upper ring (71) and the lower ring (73) are connected by a plurality of telescopic rods (72), the upper ring (71) is connected to the upper shielding seat (5), an air filling valve (17) is provided on the tank body (12), and the inner cavity of the tank body (12) is filled with clean air.

2. A tank type lightning arrester based on zero-carbon environmentally friendly gas insulation according to claim 1, characterized in that: An accessory box (14) is provided on the outer side of the tank body (12), and a low-voltage outlet terminal (15) is provided in the accessory box (14). One end of the low-voltage outlet terminal (15) is connected to the monitor (13) through a wire (11), and the other end of the low-voltage outlet terminal (15) is connected to the lower core body (9) through a wire (11).

3. A tank type lightning arrester based on zero-carbon environmentally friendly gas insulation according to claim 2, characterized in that: The accessory box (14) is installed on the tank body (12) via a grounding bar (16), and the monitor (13) is connected to the grounding bar (16) via a wire (11).

4. A tank type lightning arrester based on zero-carbon environmentally friendly gas insulation according to claim 3, characterized in that: The insulator (2) is an arc-shaped structure protruding toward the outside of the tank body (12).

5. A tank type lightning arrester based on zero-carbon environmentally friendly gas insulation according to claim 4, characterized in that: The protective cap (1) is connected to the insulator (2) via bolts.

6. A tank type lightning arrester based on zero-carbon environmentally friendly gas insulation according to claim 5, characterized in that: The bottom of the inner cavity of the tank body (12) is provided with a mounting groove for fixing the insulating cylinder (8), and the mounting groove is provided with a flange for fixing the lower core body (9).

7. A tank type lightning arrester based on zero-carbon environmentally friendly gas insulation according to claim 6, characterized in that: An explosion-proof device (10) is provided on the tank body (12).

8. The tank type lightning arrester based on zero-carbon environmentally friendly gas insulation according to claim 7 is characterized in that: The tank body (12) is made of aluminum.

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