阅读说明：本技术 混合式灭弧室 (Hybrid arc extinguishing chamber ) 是由 彭晶 王科 谭向宇 邓云坤 马仪 赵现平 李�昊 刘红文 彭兆裕 于 2020-03-13 设计创作，主要内容包括：本申请公开一种混合式灭弧室,包括：绝缘外壳、第一导杆、静触头、第二导杆、直动密封和动触头,绝缘外壳由依次连接的第一边框、第二边框、第三边框和第四边框组成的方框型结构,其内部充有绿色绝缘气体；第一导杆穿过第一边框,深入至绝缘外壳内部并连接静触头；第二导杆通过直动密封固定在第三边框上,第二导杆可沿第三边框垂直方向上下运动；第二导杆深入至所述绝缘外壳内部并连接动触头；动触头与第二边框之间以及动触头与第四边框之间均设有第一气隙；动触头与第三边框之间设有第一压气缸；静触头与动触头之间设有燃弧区。采用前述的灭弧室,融合了真空灭弧室和SF<Sub>6</Sub>灭弧室的优点,并克服各自的缺点,性能大大提升,且结构简单,应用广泛。(The application discloses hybrid explosion chamber includes: the insulating shell is of a square frame structure consisting of a first frame, a second frame, a third frame and a fourth frame which are sequentially connected, and green insulating gas is filled in the insulating shell; the first guide rod penetrates through the first frame, extends into the insulating shell and is connected with the fixed contact; the second guide rod is fixed on the third frame through a linear seal and can move up and down along the vertical direction of the third frame; the second guide rod extends into the insulating shell and is connected with the moving contact; first air gaps are arranged between the moving contact and the second frame and between the moving contact and the fourth frame; a first air cylinder is arranged between the moving contact and the third frame; an arc burning zone is arranged between the static contact and the moving contact. By adopting the arc extinguish chamber, the vacuum arc extinguish chamber andSF 6 the advantages of the arc extinguish chamber are that the respective disadvantages are overcome, the performance is greatly improved, the structure is simple, and the application is wide.)

1. A hybrid arc chute, comprising: the device comprises an insulating shell (1), a first guide rod (2), a static contact (3), a second guide rod (4), a linear motion seal (5) and a moving contact (6);

the insulating shell (1) is of a square frame shape, and the insulating shell (1) is composed of a first frame (11), a second frame (12), a third frame (13) and a fourth frame (14) which are sequentially connected; green insulating gas is filled in the insulating shell (1);

a first guide rod (2) is arranged on the first frame (11), and the first guide rod (2) penetrates through the first frame (11) and extends into the insulating shell (1) and is connected with a fixed contact (3);

a second guide rod (4) is arranged on the third frame (13), the second guide rod (4) is fixed on the third frame (13) through a linear motion seal (5), and the second guide rod (4) can move up and down along the vertical direction of the third frame (13);

the second guide rod (4) penetrates through the third frame (13) and extends into the insulating shell (1) and is connected with the moving contact (6);

first air gaps (41) are respectively arranged between the moving contact (6) and the second frame (12) and between the moving contact (6) and the fourth frame (14); a first air cylinder (42) is arranged between the moving contact (6) and the third frame (13);

an arc burning zone (7) is arranged between the static contact (3) and the moving contact (6).

2. The hybrid arc extinguishing chamber according to claim 1, characterized in that a first nozzle (43) is axially arranged on the top of one end of the second guide rod (4) extending into the insulating shell (1), a first air duct (44) is radially arranged inside the second guide rod (4), and the first air duct (44) is communicated with the first nozzle (43); the first air passage (44) is communicated with the first air cylinder (42).

3. Hybrid arc-extinguishing chamber according to claim 1, characterized in that the first guide rod (2) is fixed on the first frame (11) by means of a linear-motion seal (5), the first guide rod (2) being movable up and down in the vertical direction of the first frame (11);

when the first guide rod (2) is fixed on the first frame (11) through the direct-acting seal (5), second air gaps (21) are respectively arranged between the static contact (3) and the first frame (11) and between the static contact (3) and the fourth frame (14), and second air pressing cylinders (22) are arranged between the static contact (3) and the first frame (11).

4. The hybrid arc extinguishing chamber according to claim 3, characterized in that a second nozzle (23) is axially arranged on the top of one end of the first guide rod (2) extending into the insulating shell (1), a second air duct (24) is radially arranged inside the first guide rod (2), and the second air duct (24) is communicated with the second nozzle (23); the second air passage (24) is communicated with the second air cylinder (22).

5. Hybrid arc chute according to claim 2 or 4, characterized in that the gap between said movable contact (6) and said second border (12) and between said movable contact (6) and said fourth border (14) is 0.

6. The hybrid arc extinguishing chamber according to claim 1, characterized in that the stationary contact (3) and the movable contact (6) are provided with tapered slots to form coils.

7. The hybrid arc chute of claim 1, wherein the green insulating gas is one or more of: n is a radical of₂Dry air, CO₂、O₂、C₄F₇N、C₅F₁₀O、CF₃I。

8. Hybrid arc chute according to claim 1, characterized in that a shed (15) is provided on said insulating casing (1).

9. High-voltage switch, characterized in that it comprises a hybrid arc chute according to claims 1-8.

Technical Field

The application relates to the technical field of high-voltage switches, in particular to a hybrid arc extinguish chamber.

Background

The main function of the high-voltage switch is to close and open normal and fault circuits to protect the power system. The core component of the high-voltage switch is a high-voltage arc-extinguishing chamber, and the high-voltage arc-extinguishing chambers which are widely applied at present are a vacuum arc-extinguishing chamber and an SF (sulfur hexafluoride) chamber respectively₆An arc extinguishing chamber. The vacuum arc-extinguishing chamber is mainly applied to high-voltage switches of 3.6 kV-40.5 kV voltage class, SF₆The arc extinguish chamber is mainly applied to high-voltage switches with voltage class of more than 40.5 kV.

The traditional vacuum arc extinguish chamber comprises a moving contact, a fixed contact, a guide pipe, a shielding cover, a corrugated pipe, an insulating shell and the like. Its advantages are: 1) coils are usually formed on the moving contact and the static contact by a way of opening a chute, when current passes through the contact according to a rotating direction determined by the chute, a radial magnetic field or an axial magnetic field is generated, so that electric arcs rotate on the surfaces of the moving contact and the static contact at a high speed along a radial direction or are divided into a plurality of fine diffusion-shaped small arc columns, and the electric arcs are extinguished favorably; 2) simple structure and small volume.

The vacuum arc-extinguishing chamber has the following disadvantages: 1) the breakdown voltage of the vacuum gap is not in direct proportion to the length of the gap, so that the voltage level is difficult to increase by enlarging the size, and in order to increase the voltage level, when the voltage level is applied to the voltage level of more than 40.5kV, the voltage level is often applied in a mode of connecting a plurality of vacuum arc-extinguishing chambers in series and in parallel, so that the complexity is increased, and the engineering is difficult to implement or the product size and the manufacturing cost are large, so that the competitive advantage is lost; 2) vacuum instead of insulating gas is adopted in the reactor, so that the vacuum arc extinguishing capability is very strong, but when the reactor is switched on and off, the cutoff phenomenon is very easy to generate due to the very strong arc extinguishing capability, higher cutoff overvoltage is brought, and the safety of the vacuum arc extinguishing chamber body and the electrical equipment connected with the vacuum arc extinguishing chamber body is seriously threatened; 3) in order to ensure vacuum, the corrugated pipe is arranged in the vacuum arc-extinguishing chamber, and the corrugated pipe is correspondingly subjected to mechanical deformation once each time the vacuum arc-extinguishing chamber is operated, so that the corrugated pipe is easy to damage and is also a weak part of the vacuum arc-extinguishing chamber, and the fatigue life of the metal material of the corrugated pipe determines the mechanical life of the vacuum arc-extinguishing chamber.

SF₆Arc extinguishing chamber structure of self-powered SF₆The arc-extinguishing chamber is composed of static arc contact, main contact, nozzle, moving arc contact, air cylinder, thermal expansion chamber and one-way valve. The SF6 arc extinguishing chamber has the advantages that: 1) the breakdown voltage of SF6 gas is in direct proportion to the gap length, so the SF6 arc extinguish chamber is easy to improve the voltage grade by enlarging the size, and is very suitable for the voltage grade application of more than 40.5 kV; 2) the SF6 arc extinguishing capability under the same size is slightly poorer than that under vacuum, electric arcs can be stably burnt for a certain time and cannot be instantly extinguished, so that the phenomenon of interception is rarely generated, and interception overvoltage threatening the safety of a vacuum arc extinguishing chamber and electrical equipment connected with the vacuum arc extinguishing chamber is rarely brought; 3) the self-energy SF6 arc extinguish chamber widely used at present can reduce the operation power and the volume of the operating mechanism due to the self-energy principle.

The disadvantages of the SF6 arc chute are: 1) the structure is more complex than that of the vacuum arc extinguish chamber, and the size is larger than that of the vacuum arc extinguish chamber; 2) the method mainly relies on SF6 gas arc blowing, and a rotating magnetic field is not used for assisting arc extinction; 3) the SF6 gas is adopted, and the SF6 gas is a greenhouse gas, so that the greenhouse effect is 23900 times that of carbon dioxide, and the method does not meet the national policy of energy conservation and emission reduction.

Visible vacuum interrupter and SF₆Arc extinguishing chambers each having a significant portionDue to the vacuum interrupter and SF₆The arc-extinguishing chambers have obvious advantages and disadvantages, respectively, so that the vacuum arc-extinguishing chamber and the SF₆The combination of arc extinguishing chambers is a hot research in the industry. For example, in US patent US4204101A issued in 1980, a hybrid circuit breaker is proposed, which consists of a vacuum interrupter and an SF6 interrupter connected in series. US patent 6593538B2, granted in 2003, proposes a hybrid arc chute consisting of a vacuum arc chute and a gas arc chute in series. Patent CN101783262A granted in 2012 discloses a vacuum circuit breaker and SF-based circuit breaker₆The optically controlled modular hybrid circuit breaker with series circuit breakers is proposed in the prior art of vacuum circuit breakers, SF₆The circuit breaker and the photoelectric control base form a light-operated modular hybrid circuit breaker. It can be seen that the existing research is only to connect the vacuum arc-extinguishing chamber and the SF₆The arc extinguish chambers are connected in series, so that the structure is complex, the respective defects cannot be completely overcome, and the overall performance cannot be improved after combination.

Disclosure of Invention

The application provides a hybrid arc extinguish chamber, which integrates a vacuum arc extinguish chamber and SF₆The advantages of the arc-extinguishing chamber and the respective disadvantages are overcome to solve the existing research that only the vacuum arc-extinguishing chamber and the SF are used₆The arc extinguish chambers are connected in series, so that the structure is complex, the respective defects cannot be completely overcome, and the integral performance cannot be improved after combination.

In a first aspect, an embodiment of the present application provides a hybrid arc chute, including: the device comprises an insulating shell, a first guide rod, a static contact, a second guide rod, a direct-acting seal and a moving contact.

The insulating shell is of a square frame shape and consists of a first frame, a second frame, a third frame and a fourth frame which are sequentially connected; the insulating shell is filled with green insulating gas;

a first guide rod is arranged on the first frame, penetrates through the first frame, extends into the insulating shell and is connected with a fixed contact;

a second guide rod is arranged on the third frame, the second guide rod is fixed on the third frame through direct-acting sealing, and the second guide rod can move up and down along the vertical direction of the third frame;

the second guide rod penetrates through the third frame, extends into the insulating shell and is connected with the moving contact;

first air gaps are arranged between the moving contact and the second frame and between the moving contact and the fourth frame; a first air cylinder is arranged between the moving contact and the third frame;

and an arc burning area is arranged between the fixed contact and the movable contact.

With reference to the first aspect, in a first implementation manner, a first nozzle is axially arranged at the top of one end, deep into the insulating housing, of the second guide rod, a first air passage is radially arranged inside the second guide rod, and the first air passage is communicated with the first nozzle; the first air passage is communicated with the first air pressing cylinder.

With reference to the first aspect, in a second implementation manner, the first guide rod is fixed on the first frame through a linear dynamic seal, and the first guide rod can move up and down along a vertical direction of the first frame;

when the first guide rod is fixed on the first frame through the direct-acting seal, second air gaps are arranged between the fixed contact and the first frame and between the fixed contact and the fourth frame, and second air cylinders are arranged between the fixed contact and the first frame.

With reference to the second implementation manner of the first aspect, in a third implementation manner, a second nozzle is axially arranged at the top of one end, deep into the insulating housing, of the first guide rod, a second air passage is radially arranged inside the first guide rod, and the second air passage is communicated with the second nozzle; the second air passage is communicated with the second air cylinder.

With reference to the first or third implementation manner of the first aspect, in a fourth implementation manner, the gap between the movable contact and the second frame and the gap between the movable contact and the fourth frame are 0.

With reference to the first aspect, in a first implementation manner, the fixed contact and the movable contact are both provided with an inclined groove to form a coil.

With reference to the first aspect, in a first implementation manner, the green insulating gas is one or more of the following: n is a radical of₂Dry air, CO₂、O₂、C₄F₇N、C₅F₁₀O、CF₃I。

With reference to the first aspect, in a first implementation manner, an umbrella skirt is disposed on the insulating housing.

In a second aspect, an embodiment of the present application provides a high-voltage switch, including the hybrid arc-extinguishing chamber described in any one of the implementations of the first aspect.

The hybrid arc chute disclosed in the present application has at least the following advantages:

1. deeply fusing a vacuum arc extinguish chamber and SF₆The arc extinguishing principle of the arc extinguishing chamber is made into an integrated structure. In one aspect, SF is used₆The basic principle of the arc extinguish chamber realizes arc blowing and is self-energized SF₆The structure of the arc extinguish chamber is simplified, the complexity and the size of the arc extinguish chamber are greatly reduced, and the size of the operating mechanism is reduced. On the other hand, the basic principle of the vacuum arc extinguish chamber is considered, the flat plate structure of the moving contact and the static contact of the vacuum arc extinguish chamber is adopted, the coil is reserved, so that the electric arc rotates on the surfaces of the moving contact and the static contact at a high speed along the radial direction or is divided into a plurality of fine diffusion-shaped small arc columns, and the electric arc is extinguished favorably.

2. The interior of the arc chute is filled with an insulating gas, rather than being vacuum as in a vacuum arc chute. First, since the breakdown voltage of most insulating gases is proportional to the gap length, the vacuum interrupter can be scaled up by increasing its size, is very suitable for voltage class applications above 40.5kV, and has great advantages in complexity and size. Secondly, since there is no need to maintain vacuum, there is no need to provide a bellows with very limited life span for maintaining vacuum as in the conventional vacuum circuit breaker, thereby improving the mechanical life span of the arc extinguishing chamber. Thirdly, when the insulating gas is non-SF₆Gases, e.g. N₂Dry air, CO₂、O₂、C₄F₇N、C₅F₁₀O、CF₃I and mixtures thereof, have the advantage of environmental protection.

In general, the hybrid arc chute disclosed herein combines a vacuum arc chute and an SF₆The hybrid arc extinguish chamber has the advantages of large breaking capacity, reliable insulating performance, environmental protection and the like, and is particularly suitable for occasions of high voltage class, large breaking current, capacitive load switching, inductive load switching and the like.

Drawings

In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of embodiment 1 of the present application;

FIG. 2 is a schematic view of the structure of the present application in example 2, when a small current is turned off;

fig. 3 is a schematic structural view when a large current is turned off in embodiment 2 of the present application;

figure 4 is a schematic structural diagram of embodiment 3 of the application,

fig. 5 is a schematic structural diagram of embodiment 4 of the present application.

Wherein, 1-insulating shell, 11-first frame, 12-second frame, 13-third frame, 14-fourth frame, 15-umbrella skirt; 2-a first guide rod, 21-a second air gap, 22-a second air cylinder, 23-a second nozzle and 24-a second air channel; 3, static contact; 4-second guide rod, 41-first air gap, 42-first air cylinder, 43-first nozzle, 44-first air channel; 5-direct-acting sealing; 6-moving contact; 7-arc burning zone.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, the present application is described in further detail with reference to the accompanying drawings and the detailed description.

The application provides a hybrid arc extinguish chamber, which integrates a vacuum arc extinguish chamber and SF₆The advantages of the arc-extinguishing chamber are that,and overcomes the respective disadvantages to solve the existing research that only the vacuum arc-extinguishing chamber and the SF are used₆The arc extinguish chambers are connected in series, so that the structure is complex, the respective defects cannot be completely overcome, and the integral performance cannot be improved after combination.