Series gap lightning arrester

Abstract

The utility model discloses a series gap lightning arrester which comprises an insulating support body, a plurality of electric conductors, an arc extinguish chamber and an arc blow-out hole, the axis of the inner cavity of the insulating support body is a folding line which is bent in a reciprocating manner; and the conductor is arranged at the vertex of the folding line. According to the utility model, the axis of the cavity is designed into the folding line which is bent in a reciprocating manner, so that the purposes of increasing the total length of the gap, uniformly distributing an electric field and increasing the number of the arc extinguish chambers are achieved, the voltage endurance capability, the arc extinguish capability and the reliability of the lightning arrester are improved, and an electric power system or electrical equipment is better protected from being damaged by overvoltage.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical devices, in particular to a series gap arrester. Background Art

[0002] A series gap arrester is an overvoltage protection device used to protect power systems or electrical equipment. It is commonly used in high-voltage transmission lines, substations, and important electrical equipment to prevent lightning or overvoltage from damaging system equipment.

[0003] like Figure 1 As shown, a complete series gap lightning arrester includes: a soft wire 1 electrically connected to the transmission line, an upper drain plate 2, a lower drain plate 4 electrically connected to the ground wire, a grounding electrode 5, a supporting insulator 6 supported between the upper drain plate 2 and the lower drain plate 4, and a series gap lightning arrester 7 arranged between the grounding electrode and the lightning electrode 3 and the grounding electrode 5. The series gap lightning arrester 7 includes a plurality of conductors with gaps arranged in an insulating support body, and an arc extinguishing chamber with an arc blowing hole is formed at the gap between two adjacent conductors. When overvoltage or lightning strike occurs in the system, arc discharge will be formed in the arc extinguishing chamber, and the current with excessively high voltage will be guided into the atmosphere, thereby protecting the equipment.

[0004] Generally speaking, the internal gap of the gap arrester needs to maintain a sufficient total gap length, otherwise it may cause breakdown and insulation failure. However, when the total length of the arrester is determined, it is difficult to increase the total gap length, so it is necessary to improve its structure. Utility Model Content

[0005] In order to increase the total length of the internal gap of the series gap arrester and ensure its breakdown resistance and reliability, the utility model provides a series gap arrester.

[0006] The technical solution adopted by the utility model is as follows: a series gap lightning arrester, comprising: an insulating support body, having a cavity penetrating from top to bottom inside; a plurality of conductors, with gaps arranged in the cavity; a plurality of arc extinguishing chambers formed between adjacent conductors; a plurality of arc blowing holes, arranged on the insulating support body, corresponding to and connected to the plurality of arc extinguishing chambers one by one; the axis of the cavity is a reciprocating fold line, and the conductors are arranged at the vertices of the fold line.

[0007] Preferably, the conductor is divided into: a first conductor, which is arranged at the top of the cavity and partially exposed; a second conductor, which is arranged at the bottom of the cavity; and a plurality of third conductors, which are intermittently arranged between the first conductor and the second conductor in the cavity.

[0008] Preferably, the plurality of third electrical conductors are arranged at equal intervals.

[0009] Preferably, it further comprises: a ground electrode receiving groove formed at the lowermost end of the cavity.

[0010] Preferably, it also includes: large umbrella skirts and small umbrella skirts, which are staggered and evenly arranged on the outer wall of the insulating support body, and the small umbrella skirts are arranged below the large umbrella skirts.

[0011] Preferably, the arc extinguishing chamber has a shape in the axial direction that is large at both ends and small in the middle.

[0012] Preferably, the arc blowing hole is arranged on the side where the outer wall of the insulating support body is closer to the arc extinguishing chamber.

[0013] The utility model has the following beneficial effects:

[0014] 1. Improve the breakdown voltage: By designing the axis of the cavity into a reciprocating fold line shape and arranging the conductor at the vertex of the fold line, the total length of the gap can be increased, thereby increasing the breakdown voltage and reducing the breakdown risk of the arrester when it is subjected to overvoltage shock;

[0015] 2. Uniform distribution of electric field: The conductors are arranged at the vertices of the broken line, which can achieve a relatively uniform distribution of the electric field, help to evenly share the electric shock discharge, reduce the energy and voltage borne by a single conductor, and reduce the risk of overheating of the conductor;

[0016] 3. Increase the number of arc extinguishing chambers: By increasing the vertices on the broken line, the number of arc extinguishing chambers can be increased. Therefore, increasing the number of arc extinguishing chambers can improve the arc extinguishing capacity of the lightning arrester. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a complete installation diagram of the series gap lightning arrester.

[0018] Figure 2 It is a cross-sectional schematic diagram of an embodiment of the utility model.

[0019] Figure 3 It is an enlarged schematic diagram of an embodiment of the utility model.

[0020] Flexible conductor 1; upper drain plate 2; lightning electrode 3; lower drain plate 4; grounding electrode 5; supporting insulator 6; series gap arrester 7, insulating support 701, arc extinguishing chamber 702, arc blowing hole 703, first conductor 704, second conductor 705, third conductor 706, grounding electrode groove 707, large umbrella skirt 708, small umbrella skirt 709. DETAILED DESCRIPTION

[0021] The utility model is further described below in conjunction with the embodiments and drawings.

[0022] In the embodiment, Figures 1 to 3As shown, a series gap lightning arrester includes: an insulating support 701, which has a cavity that passes through from top to bottom; a plurality of conductors, and a gap is set in the cavity; a plurality of arc extinguishing chambers 702, which are formed between adjacent conductors; a plurality of arc blowing holes 703, which are set on the insulating support 701, corresponding to and connected with the plurality of arc extinguishing chambers 702 one by one; the axis of the cavity is a reciprocating fold line, and the conductor is arranged at the vertex of the fold line. Among them, the conductor is divided into: a first conductor 704, which is set at the top of the cavity and partially exposed; a second conductor 705, which is set at the bottom of the cavity; and a plurality of third conductors 706, with a gap set between the first conductor 704 and the second conductor 705 in the cavity. In this embodiment, the axis of the cavity is designed to be a reciprocating fold line, so as to achieve the purpose of increasing the total length of the gap, uniform electric field distribution and increasing the number of arc extinguishing chambers, which is helpful to improve the voltage resistance, arc extinguishing ability and reliability of the lightning arrester, thereby better protecting the power system or electrical equipment from overvoltage damage.

[0023] In the embodiment, Figure 2 , 3 As shown, several third conductors 706 are arranged equidistantly. The equidistant arrangement of the third conductors 706 can help achieve a more uniform electric field distribution. By arranging at equal distances, the electric field is evenly distributed between each conductor, thereby reducing the electric field concentration and voltage gradient, and improving the voltage resistance of the arrester. When the arrester is subjected to an overvoltage shock, the third conductors 706 are arranged equidistantly, and the electric shock discharge will be evenly shared among the third conductors 706, reducing the energy and voltage borne by a single third conductor 706, and reducing the risk of overheating of the third conductor 706. In addition, the third conductors 706 are arranged equidistantly to form multiple arc extinguishing chambers 702, which can provide a larger surface area and electric shock discharge path, thereby enhancing the arc extinguishing performance of the arrester.

[0024] In the embodiment, Figure 2 As shown, the grounding electrode receiving groove 707 is also included, which is formed at the lowermost end of the cavity. The grounding electrode receiving groove 707 enables the grounding electrode 5 to be stably and reliably installed.

[0025] In the embodiment, Figure 2 , 3As shown, it also includes: large umbrella skirts 708 and small umbrella skirts 709, which are staggered and evenly arranged on the outer wall of the insulating support body 701, and the small umbrella skirts 709 are arranged below the large umbrella skirts 708. The large umbrella skirts 708 and the small umbrella skirts 709 can form a physical barrier, effectively blocking dust, water droplets or other impurities in the air from entering the interior of the lightning arrester, and reducing the impact of these pollutants on the lightning arrester. At the same time, the large umbrella skirts 708 and the small umbrella skirts 709 are made of insulating materials, have good insulation properties, can form an insulating layer, and improve the insulation capacity of the lightning arrester. In addition, the presence of the large umbrella skirts 708 and the small umbrella skirts 709 can reduce the interference of the DC electric field in the environment to the lightning arrester, prevent external electric field interference from entering the lightning arrester, and keep the electric field distribution of the lightning arrester stable.

[0026] In the embodiment, Figure 3 As shown, the arc extinguishing chamber 702 has a shape with large ends and a small middle in the axial direction. The arc extinguishing chamber 702 of this structure reduces the cross-sectional area of ​​the arc channel and can accelerate the arc propagation speed, thereby achieving the purpose of extinguishing the arc.

[0027] In the embodiment, Figure 2 , 3 As shown, the arc blowing hole 703 is arranged on the side where the distance between the outer wall of the insulating support body 701 and the arc extinguishing chamber 702 is small. In this embodiment, the length of the arc blowing hole 703 is set as short as possible, and the arc will discharge faster, thereby reducing the arc extinguishing time. Shortening the arc extinguishing time can improve the response speed of the lightning arrester and release the overvoltage into the atmosphere faster.

[0028] Obviously, the above embodiments of the present invention are only examples for explaining the present invention, and are not intended to limit the implementation methods of the present invention. Other obvious changes or modifications derived from the essence of the present invention still fall within the protection scope of the present invention.

Claims

1. A series gap arrester, comprising: An insulating support body (701) having a cavity extending vertically therein; a plurality of electrical conductors, with gaps disposed in the cavity; A plurality of arc extinguishing chambers (702) are formed between adjacent conductors; A plurality of arc blowing holes (703) are arranged on the insulating support body (701) and correspond one-to-one to and are in communication with the plurality of arc extinguishing chambers (702); Features: The axis of the cavity is a fold line that bends back and forth, and the conductor is arranged at the vertex of the fold line.

2. The series gap arrester according to claim 1, characterized in that: The conductors are classified into: A first conductor (704) is arranged at the top of the cavity and is partially exposed; A second conductor (705) is arranged at the bottom end of the cavity; A plurality of third conductors (706) are interspaced and arranged between the first conductor (704) and the second conductor (705) in the cavity.

3. The series gap arrester according to claim 2, characterized in that: A plurality of third electrical conductors (706) are arranged at equal intervals.

4. The series gap arrester according to claim 1, characterized in that: Also includes: A ground electrode receiving groove (707) is formed at the lowermost end of the cavity.

5. The series gap arrester according to claim 1, characterized in that: Also includes: The large umbrella skirt (708) and the small umbrella skirt (709) are arranged alternately and evenly on the outer wall of the insulating support body (701), and the small umbrella skirt (709) is arranged below the large umbrella skirt (708).

6. The series gap arrester according to claim 1, characterized in that: The arc extinguishing chamber (702) has a shape in the axial direction that is large at both ends and small in the middle.

7. The series gap arrester according to claim 1, characterized in that: The arc blowing hole (703) is arranged on the side where the distance between the outer wall of the insulating support body (701) and the arc extinguishing chamber (702) is smaller.

Images