CN216818201U

CN216818201U - Current limiter circuit breaking structure

Info

Publication number: CN216818201U
Application number: CN202220333497.9U
Authority: CN
Inventors: 任蔚; 张鹏; 欧阳晋武
Original assignee: Shaanxi Qinyu Electrical Appliances Co ltd
Current assignee: Shaanxi Qinyu Electrical Appliances Co ltd
Priority date: 2022-02-18
Filing date: 2022-02-18
Publication date: 2022-06-24
Anticipated expiration: 2032-02-18

Abstract

The utility model discloses a current limiter circuit breaking structure, which belongs to the technical field of current limiters and comprises a control box and a mechanism box connected with the control box through a lead, wherein a quick mechanism, a slow mechanism and a manual on-off mechanism are arranged in the mechanism box; the rapid mechanism consists of a repulsion mechanism and a vacuum arc extinguish chamber, the vacuum arc extinguish chamber is directly connected through an insulating pull rod, a threaded sleeve, a shaft and a repulsion plate, the lowest end of the shaft is provided with a shaft wall with a cross-shaped structure, two ends of the shaft wall are provided with sliding blocks, and a bistable spring for keeping the opening and closing positions is contacted between the two sliding blocks; the low-speed mechanism consists of a permanent magnet mechanism, a vacuum arc extinguish chamber and a reactor, wherein the vacuum arc extinguish chamber is directly connected with a permanent magnet mechanism shaft through an insulating pull rod and a threaded sleeve, the permanent magnet mechanism is attracted after being electrified, and a return spring is arranged in the permanent magnet mechanism. The current limiter circuit breaking structure is simple in structure and high in practicability.

Description

Current limiter circuit breaking structure

Technical Field

The utility model belongs to the technical field of current limiters, and particularly relates to a current limiter circuit breaking structure.

Background

The current limiter is a device for limiting current, and can be used to increase the short-circuit impedance of the circuit, so as to limit the short-circuit current. Commonly used current limiters include a split reactor and a split transformer;

the existing current limiter circuit-breaking structure cannot well deal with the short-circuit fault of a circuit through a quick mechanism and a slow mechanism when in use, thereby influencing the use of people.

Therefore, in order to meet the current situation, it is necessary to design and produce a current limiter breaking structure to meet the practical use requirement.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to a circuit breaking structure of a current limiter, so as to solve the problems mentioned in the background art.

In order to achieve the purpose, the utility model provides the following technical scheme: a current limiter circuit breaking structure comprises a control box and a mechanism box connected with the control box through a lead, wherein a quick mechanism, a slow mechanism and a manual opening and closing mechanism are arranged in the mechanism box;

the rapid mechanism consists of a repulsion mechanism and a vacuum arc extinguish chamber, the vacuum arc extinguish chamber is directly connected through an insulating pull rod, a threaded sleeve, a shaft and a repulsion plate, the lowermost end of the shaft is provided with a shaft wall with a cross-shaped structure, two ends of the shaft wall are provided with sliding blocks, and a bistable spring for keeping the opening and closing positions is contacted between the two sliding blocks;

the low-speed mechanism consists of a permanent magnet mechanism, a vacuum arc extinguish chamber and a reactor, the vacuum arc extinguish chamber is directly connected with a permanent magnet mechanism shaft through an insulating pull rod and a threaded sleeve, the permanent magnet mechanism is attracted after being electrified, and a return spring is arranged in the permanent magnet mechanism.

In a further embodiment, the top of the mechanism box is provided with a symmetrical insulating mechanism, the insulating mechanism comprises a first composite insulator at the bottom and a second composite insulator positioned above the first composite insulator, and the first composite insulator is connected with the second composite insulator through a connecting flange.

In a further embodiment, the top of one of the second composite insulators is connected with the reactor through a mounting seat.

In a further embodiment, the vacuum arc-extinguishing chamber is arranged in an inner cavity of the second composite insulator.

In a further embodiment, the insulating pull rod is arranged in an inner cavity of the first composite insulator.

The utility model has the technical effects and advantages that: according to the current limiter circuit breaking structure, a fast mechanism is in a conducting state under the normal working condition of a distribution line, no current passes through a reactor at the moment, when the line has a short-circuit fault, a control unit identifies the short-circuit fault and then sends a brake-separating instruction to the fast mechanism, the fast mechanism is rapidly opened, the short-circuit current is transferred to the reactor of the slow mechanism, and after the set current limiting time, the control unit sends a brake-closing instruction, the fast mechanism is closed, and the slow mechanism is restored to the normal working state; the current limiter circuit breaking structure is simple in structure and high in practicability.

Drawings

FIG. 1 is a front view of the present invention;

FIG. 2 is a cross-sectional view of the present invention;

FIG. 3 is a schematic structural view of the quick mechanism of the present invention;

fig. 4 is a schematic structural diagram of the slow mechanism of the present invention.

In the figure: 1. a control box; 2. a mechanism box; 3. a first composite insulator; 4. a connecting flange; 5. a second composite insulator; 6. a reactor; 7. a fast mechanism; 8. a slow mechanism; 9. manually opening and closing; 10. an insulating pull rod; 11. a vacuum arc-extinguishing chamber.

Detailed Description

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the utility model.

Referring to the attached

drawings

1 and 2, the current limiter circuit breaking structure comprises a control box 1 and a mechanism box 2 connected with the control box 1 through a wire, wherein a quick mechanism 7, a slow mechanism 8 and a manual opening and closing mechanism 9 are arranged in the mechanism box 2, symmetrical insulating mechanisms are arranged at the top of the mechanism box 2, each insulating mechanism comprises a first composite insulator 3 at the bottom and a second composite insulator 5 positioned above the first composite insulator 3, the first composite insulator 3 and the second composite insulator 5 are connected through a connecting flange 4, the top of one second composite insulator 5 is connected with a reactor 6 through a mounting seat, a vacuum arc extinguish chamber 11 is arranged in an inner cavity of the second composite insulator 5, and an insulating pull rod 10 is arranged in the inner cavity of the first composite insulator 3;

referring to fig. 3, the fast mechanism 7 is composed of a repulsion mechanism and a vacuum arc-extinguishing chamber 11, the vacuum arc-extinguishing chamber 11 is directly connected through an insulating pull rod 10, a threaded sleeve, a shaft and a repulsion plate, the lowest end of the shaft is provided with a shaft wall with a cross-shaped structure, two ends of the shaft wall are provided with sliding blocks, a bistable spring for keeping the opening and closing positions is contacted between the two sliding blocks, when one coil discharges, electric power is generated between the two sliding blocks and the repulsion plate, the repulsion plate drives a main shaft to move, the opening or closing actions are completed, a shaft wall part is fixed at the tail end of the main shaft, the shaft wall is connected with the sliding blocks, one ends of the sliding blocks are springs, and the opening and closing positions are kept through the two springs;

referring to fig. 4, the slow speed mechanism 8 is composed of a permanent magnetic mechanism, a vacuum arc extinguish chamber 11 and a reactor 6, the vacuum arc extinguish chamber 11 is directly connected with a permanent magnetic mechanism shaft through an insulating pull rod 10 and a threaded sleeve, the permanent magnetic mechanism is attracted after being electrified, a return spring is arranged in the permanent magnetic mechanism, when the vacuum arc extinguish chamber is located at a switching-on position, no current passes through a coil, a movable iron core is kept at the upper end under the action of permanent magnet, when the switching-off is carried out, current in a specific direction passes through an operation coil, the current generates a magnetic field opposite to the magnetic field of the permanent magnet at the upper end of the movable iron core, the magnetic attraction force borne by the movable iron core is reduced, and when the upward resultant force borne by the movable iron core is smaller than the tensile force of the spring, the movable iron core moves downward to realize the switching-off; when the movable iron core is in a brake-separating position, the operating coil passes current opposite to brake-separating operation, the current generates a magnetic field with the same direction as the magnetic field of the permanent magnet on the upper part of the fixed iron core, and generates a magnetic field opposite to the magnetic field of the permanent magnet on the lower part of the movable iron core, so that the magnetic attraction force on the lower end of the movable iron core is reduced; when the operating current is increased to a certain value, the upward electromagnetic resultant force is greater than the suction force at the lower end and the counter force of the spring, and the movable iron core moves upwards to realize closing.

The working principle of the current limiter circuit-breaking structure is that under the normal working state of a distribution line, a fast mechanism 7 and a slow mechanism 8 are both in a closing state, when the fast mechanism 7 receives a switching-off command, a pulse capacitor discharges to a switching-off coil, a repulsion plate drives a vacuum arc-extinguishing chamber 11 to move downwards under the driving of electromagnetic force, so that the vacuum arc-extinguishing chamber 11 is in the opening state, the bounce-free switching-off is completed under the action of a buffer, and finally the vacuum arc-extinguishing chamber is kept in a switching-off position under the action of a bistable spring, at the moment, no current passes through the slow mechanism 8, when the line has a short-circuit fault, a control unit identifies the short-circuit fault, sends the switching-off command to the fast mechanism 7, the fast mechanism 7 is rapidly switched off, the short-circuit current is transferred to a current-limiting reactor, the slow mechanism 8 starts to act, the vacuum arc-extinguishing chamber 11 is driven to act through an insulating pull rod 10, when the line is in the switching-on position, when the operating current is increased to a certain value, the upward electromagnetic resultant force is greater than the reaction force between the suction force of the lower end and the spring, the movable iron core moves upwards to realize closing, and meanwhile, the vacuum arc-extinguishing chamber 11 is in a closed state.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the utility model.

Claims

1. The utility model provides a current limiter structure of opening circuit, includes control box (1) and mechanism case (2) that are connected with control box (1) through the wire, its characterized in that: a quick mechanism (7), a slow mechanism (8) and a manual opening and closing mechanism (9) are arranged in the mechanism box (2);

the rapid mechanism (7) consists of a repulsion mechanism and a vacuum arc-extinguishing chamber (11), the vacuum arc-extinguishing chamber (11) is directly connected through an insulating pull rod (10), a threaded sleeve, a shaft and a repulsion disc, the lowest end of the shaft is provided with a shaft wall with a cross-shaped structure, two ends of the shaft wall are provided with sliding blocks, and a bistable spring for keeping the opening and closing positions is contacted between the two sliding blocks;

the low-speed mechanism (8) is composed of a permanent magnet mechanism, a vacuum arc extinguish chamber (11) and an electric reactor (6), the vacuum arc extinguish chamber (11) is directly connected with a permanent magnet mechanism shaft through an insulating pull rod (10), a threaded sleeve, the permanent magnet mechanism is attracted after being electrified, and a return spring is arranged in the permanent magnet mechanism.

2. A current limiter circuit interrupting structure as claimed in claim 1 wherein: the top of mechanism case (2) is provided with symmetrical insulating mechanism, and insulating mechanism includes the composite insulator one (3) of bottom and is located the composite insulator two (5) of composite insulator one (3) top, be connected through flange (4) between composite insulator one (3) and the composite insulator two (5).

3. A current limiter circuit interrupting structure as claimed in claim 2 wherein: the top of one of the second composite insulators (5) is connected with the reactor (6) through the mounting seat.

4. A current limiter circuit interrupting structure as claimed in claim 3 wherein: and the vacuum arc extinguish chamber (11) is arranged in the inner cavity of the second composite insulator (5).

5. A current limiter circuit interrupting structure as claimed in claim 4 wherein: the insulating pull rod (10) is arranged in an inner cavity of the first composite insulator (3).