WO2020151464A1

WO2020151464A1 - Vacuum arc extinguishing chamber and vacuum circuit breaker

Info

Publication number: WO2020151464A1
Application number: PCT/CN2019/130192
Authority: WO
Inventors: 毕迎华; 郭煜敬; 韩国辉; 赵晓民; 韩桂全; 李永林; 李旭旭; 刘庆; 庞素敏; 王铭飞; 刘文魁
Original assignee: 国家电网有限公司; 平高集团有限公司
Priority date: 2019-01-21
Filing date: 2019-12-30
Publication date: 2020-07-30
Also published as: CN111463061A

Abstract

The present application provides a vacuum arc extinguishing chamber and a vacuum circuit breaker, for solving the technical problem in the prior art of a vacuum arc extinguishing chamber being unable to satisfy usage requirements in a high power scenario. The vacuum arc extinguishing chamber of the present application comprises a housing, a movable contact, and a static contact; the movable contact comprises a movable main contact and a movable arcing contact; the static contact comprises a static main contact and a static arcing contact; an arc insulating gap is provided between the movable main contact and the movable arcing contact; an arc insulating gap is provided between the static main contact and the static arcing contact; the static main contact has a channel extending along an inserting direction; the positions of the static main contact and static arcing contact correspond to the positions of the movable main contact and movable arcing contact; the static arcing contact is movably mounted on the static main contact; the static arcing contact extends out of the static main contact, and the movable arcing contact extends out of the movable main contact, so that the movable arcing contact may come into contact with the static arcing contact before the movable main contact comes into contact with the static main contact when closing, and the movable arcing contact may be separated from the static arcing contact after the movable main contact is separated from the static main contact when opening; the movable arcing contact and the static arcing contact are both coil magnetic field contacts.

Description

Vacuum interrupter and vacuum circuit breaker

Cross references to related applications

This application is based on a Chinese patent application with an application number of 201910054573.5 and an application date of January 21, 2019, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby incorporated into this application by reference.

Technical field

This application relates to the field of vacuum interrupters and vacuum circuit breakers.

Background technique

High-voltage circuit breakers are the most important control and protection equipment in the power system. At present, the 72.5kV and above circuit breakers used in the power system are almost all SF6 circuit breakers. However, SF6 gas is the strongest greenhouse gas restricted by international conventions. The development of vacuum switchgear to replace SF6 circuit breakers has become a high voltage at home and abroad. Research hotspots in the field of switches. Compared with SF6 circuit breakers, vacuum circuit breakers have the characteristics of environmental friendliness, long life, and maintenance-free. Many institutions at home and abroad have successively developed 72.5kV and 126kV single-break vacuum circuit breakers and connected to the grid for operation. However, the rated current of the existing 126kV single-break vacuum circuit breaker can only reach the rated breaking current of 40kA and the rated current of 2500A, which cannot meet the power system requirements of 126kV/40kA/3150A.

The Chinese patent with the publication number CN202307674U discloses a vacuum interrupter and a vacuum circuit breaker using the vacuum interrupter, which mainly include an upper main contact, an upper arc contact, a lower main contact, and a lower arc contact. The upper arc contact and the lower arc contact are located between the upper main contact and the lower main contact. When the above-mentioned vacuum circuit breaker is closed and opened, the arc burns on the upper arc contact and the lower arc contact. Both the upper arc contact and the lower arc contact use anti-welding contact materials to make the upper and lower arcs The contacts can withstand arc ablation. However, the welding resistance of the upper and lower arc contacts is limited by the material of the arc contacts and cannot be applied to higher power applications.

There is also a vacuum interrupter in the prior art that uses coil magnetic field contacts (longitudinal magnetic field contacts and transverse magnetic field contacts) to extinguish arcs, but the current types of contacts need to meet both arc extinguishing requirements and current flow requirements. , And the improvement of the arc extinguishing ability will be accompanied by the increase in the number of turns of the arc extinguishing coil and the increase of the resistance, that is, the arc extinguishing ability and the flow capacity of the magnetic field contact are a pair of contradictions, and it is also not suitable for high power occasion.

Summary of the invention

The purpose of the embodiments of this application is to provide a vacuum interrupter to solve the technical problem that the vacuum interrupter in the prior art cannot meet the requirements of high-power applications; the embodiment of this application also provides a vacuum circuit breaker to solve the existing The technical problem of vacuum circuit breaker with small rated power.

In order to achieve the foregoing objectives, the vacuum interrupter in the embodiments of the present application adopts the following technical solutions:

The vacuum interrupter includes a housing, a moving contact and a static contact. The moving contact includes a moving main contact and a moving arc contact. The static contact includes a static main contact and a static arc contact. An arc isolation gap is provided between the moving main contact and the moving arc contact, an arc isolation gap is provided between the static main contact and the static arc contact, and the moving and static main contacts are used for In normal flow, the dynamic and static arc contacts are used for arc extinguishing, the static main contact has a channel extending along the plugging direction, and the static arc contact is located on the channel near the static contact At one end, the positions of the static main and arc contacts correspond to the movable main and arc contacts, the static arc contacts are movably assembled on the static main contacts, and the static arc contacts extend to the The static main contact and the moving arc contact extend beyond the moving main contact so that when closing, the moving arc contact and the static arc contact precede the moving main contact When the switch is opened, the moving arc contact and the static arc contact are separated after the moving main contact and the static main contact, and the moving arc contact Both the head and the static arc contact are coil magnetic field contacts.

In the vacuum interrupter of the embodiment of the application, the movable arc contact and the static arc contact are set as coil magnetic field contacts, and are equipped with special dynamic and static main contacts, so that the dynamic and static main contacts can be fully utilized The arc extinguishing characteristics of the arc extinguishing chamber can meet the requirements of higher power occasions.

Further, in order to avoid forming a pressure cylinder at the end of the static arc contact away from the moving contact and facilitate the movement of the static arc contact relative to the static main contact, the passage on the static main contact is a transparent passage, so The static arc contact is connected to the static main contact through a static end bellows, and the static end bellows isolates the passage from the outside at an end of the static arc contact away from the moving contact.

Further, compared with the transverse magnetic field contact, the longitudinal magnetic field contact is easier to meet the arc extinguishing ability in a small size, and the transverse magnetic field contact can also meet the arc extinguishing demand. The dynamic and static arc contacts are longitudinal magnetic fields. The contact, or the moving or static arc contact is a transverse magnetic field contact.

Further, in order to limit the arc position outside the moving main contact and avoid ablation of the moving main contact, the moving main contact is in the shape of a cylinder with one end open, sleeved on the moving arc contact, and the opening faces For the static contact, one end of the moving arc contact close to the static contact protrudes out of the moving main contact.

In order to achieve the foregoing objectives, the vacuum circuit breaker in the embodiments of the present application adopts the following technical solutions:

A vacuum circuit breaker includes an operating mechanism and a vacuum interrupter. The vacuum interrupter includes a housing, a static contact, and a moving contact connected to the operating mechanism, the moving contact including a moving main contact The static contact includes a static main contact and a static arc contact. An arc gap is provided between the moving main contact and the moving arc contact. The static main contact An arc isolation gap is provided between the static arc contact and the static main contact. The dynamic and static main contacts are used for normal flow, the dynamic and static arc contacts are used for arc extinguishing, and the static main contact has an edge The channel extending in the insertion direction, the static arc contact is provided at one end of the channel close to the static contact, the positions of the static main and arc contacts correspond to the movable main and arc contacts, the static The arc contact is movably assembled on the static main contact, the static arc contact extends beyond the static main contact and the moving arc contact extends beyond the moving main contact so that When closing, the moving arc contact and the static arc contact come into contact with the static main contact before the moving main contact, and when opening, the moving arc contact and the static arc The contact is separated from the static main contact after the moving main contact, and both the moving arc contact and the static arc contact are coil magnetic field contacts.

In the vacuum circuit breaker of the embodiment of the present application, the movable arc contact and the static arc contact are set as coil magnetic field contacts, and are equipped with special dynamic and static main contacts, so that the dynamic and static main contacts can be fully utilized. The current flow is special, and there is no need to consider the flow capacity of the dynamic and static arc contacts, and give full play to its arc extinguishing specialties, so that the circuit breaker can meet the requirements of higher power occasions.

Further, in order to avoid the formation of a pressure cylinder at the end of the static arc contact away from the moving contact and facilitate the movement of the static arc contact relative to the static main contact, the passage on the static main contact is a transparent passage, so The static arc contact is connected to the static main contact through a static end bellows, and the static end bellows isolates the passage from the outside at an end of the static arc contact away from the moving contact.

Description of the drawings

FIG. 1 is a schematic diagram of the vacuum interrupter of Embodiment 1 of the vacuum circuit breaker of this application.

In the figure: 1. Static bellows; 2. Static conductive rod; 3. Static main contact; 4. Main shielding cover; 5. Static longitudinal magnetic field contact; 51, conductive rod; 6. Dynamic longitudinal magnetic field contact; 7 , Moving main contact; 8. Moving conductive rod; 9. Housing; 10. Moving bellows; 11. Main contact pressure spring.

detailed description

The specific implementation of the present application will be further described below in conjunction with the drawings.

The specific embodiment 1 of the vacuum circuit breaker of the present application, as shown in FIG. 1, includes an operating mechanism (not shown in the figure) and a vacuum interrupter. The vacuum interrupter includes a housing 9 and is assembled in the housing 9 The static contact, the moving contact connected with the operating mechanism. The static contact includes the static main contact 3 and the static arc contact. The moving contact includes the moving main contact 7 and the moving arc contact. There is an arc separation gap between the moving main contact 7 and the moving arc contact to prevent During the arcing process, the arc is transferred from the moving arc contact to the moving main contact 7 to ablate the moving main contact 7; there is an arc gap between the static main contact 3 and the static arc contact to prevent the arcing process In this case, the arc transfers from the static arc contact to the static main contact 3 and ablates the static main contact 3. Both the static arc contact and the moving arc contact are coil magnetic field contacts. Specifically, the static arc contact in this embodiment The head is a static longitudinal magnetic field contact 5, and the moving arc contact is a moving longitudinal magnetic field contact 6 (in other embodiments, the moving and static arc contacts may also be transverse magnetic field contacts). Among them, the moving main contact 7 and the static main contact 3 are used for normal conduction current, and the moving longitudinal magnetic field contact 6 and the static longitudinal magnetic field contact 5 are used for arc extinguishing. A main shielding cover 4 for electric field shielding is also circumferentially arranged at the contact position of the static contact and the moving contact.

The vacuum interrupter also includes a static conductive rod 2 with a cylindrical structure. The static conductive rod 2 is fixedly connected to the upper end surface of the housing 9. The lower end of the static conductive rod 2 forms a static main contact 3. The static conductive rod 2 has a transparent channel extending along the insertion direction, the conductive rod 51 is arranged in the channel, the upper end of the conductive rod 51 is provided with a static bellows 1, and the static longitudinal magnetic field contact 5 is arranged at the lower end of the conductive rod 51 , The upper end of the static bellows 1 is connected with the static conductive rod 2, and the channel is isolated from the outside through the upper end of the static bellows 1. When the static longitudinal magnetic field contact 5 contacts the dynamic longitudinal magnetic field contact 6 and receives upward pressure, the static longitudinal magnetic field contact 5 can move up and down relative to the static conductive rod 2. The static longitudinal magnetic field contact 5 extends beyond the static main contact 3 along the length of the conductive rod 51. The upper ends of the static conductive rod 2 and the static bellows 1 are fixedly connected to the upper terminal board (not shown in the figure) of the circuit breaker.

The vacuum interrupter also includes a movable conductive rod 8, and the movable conductive rod 8 is assembled in the housing 9 so as to move up and down relative to the housing 9. The movable conductive rod 8 contacts the lower wiring board (not shown in the figure) through a sliding conductive method such as a strap contact finger or a spring contact finger, and together constitutes a main conductive circuit. The moving main contact 7 and the moving longitudinal magnetic field contact 6 are arranged on the upper end of the moving conductive rod 8. The moving main contact 7 is in the shape of a cylinder with an opening at one end, and the opening faces the static contact and is sleeved on the moving longitudinal magnetic field contact 6. The longitudinal magnetic field contact 6 is arranged inside the movable main contact 7. The moving main contact 7 is arranged in the up and down direction corresponding to the static main contact 3, the moving longitudinal magnetic field contact 6 is arranged in the up and down direction corresponding to the static longitudinal magnetic field contact 5, and the end of the moving longitudinal magnetic field contact 6 protruding near the static contact To move the main contact 7 outside. The lower end of the movable conductive rod 8 is also provided with a movable bellows 10, and the lower end of the movable bellows 10 is also provided with a main contact pressure spring 11. The main contact pressure spring 11 is in transmission connection with an operating mechanism (not shown in the figure), and the operating mechanism is used to drive the movable contact to move to the static contact.

When the vacuum circuit breaker of the present application is in use, the main contact pressure spring 11, the moving conductive rod 8 and the moving longitudinal magnetic field contact 6 together move to the static contact under the action of the mechanism. Since the dynamic longitudinal magnetic field contact 6 protrudes from the movable main contact 7 and the static longitudinal magnetic field contact 5 protrudes from the static main contact 3, the dynamic longitudinal magnetic field contact 6 and the static longitudinal magnetic field contact 5 first contact. When the dynamic longitudinal magnetic field contact 6 contacts the static longitudinal magnetic field contact 5, since the initial pressure of the main contact pressure spring 11 is greater than the final pressure of the elastic elements such as the static bellows 1, the elastic elements such as the static bellows 1 contract and deform, and the dynamic The longitudinal magnetic field contact 6 pushes the static longitudinal magnetic field contact 5 upward. When the moving main contact 7 contacts the static main contact 3, the main contact pressure spring 11 is compressed to provide positive pressure for the closing contact between the moving main contact 7 and the static main contact 3, thereby reducing the contact between the contacts. Resistance to pass the rated current to complete the closing operation. At the initial stage of the circuit breaker opening, the main contact pressure spring 11 moves downward to release the pressure on the moving main contact 7. After the moving main contact 7 and the static main contact 3 are separated, the moving longitudinal magnetic field contact 6 and the static longitudinal magnetic field contact 5 are still closed under the action of the elastic element. The moving conductive rod 8 continues to move downwards. When the elastic elements such as the static bellows 1 return to their original shape, the moving longitudinal magnetic field contact 6 is separated from the static longitudinal magnetic field contact 5, and an arc is generated between them. Due to the action of the longitudinal magnetic field between the dynamic longitudinal magnetic field contact 6 and the static longitudinal magnetic field contact 5, the arc is well controlled between the dynamic longitudinal magnetic field contact 6 and the static longitudinal magnetic field contact 5, avoiding the moving main contact 7 and the static main contact 3 are subject to arc ablation to ensure the smooth opening of the circuit breaker.

The specific embodiment of the vacuum interrupter of the present application has the same structure as the vacuum interrupter in the above-mentioned embodiment of the vacuum circuit breaker, and will not be repeated here.

Claims

The vacuum interrupter includes a housing, a moving contact and a static contact. The moving contact includes a moving main contact and a moving arc contact. The static contact includes a static main contact and a static arc contact. An arc isolation gap is provided between the moving main contact and the moving arc contact, an arc isolation gap is provided between the static main contact and the static arc contact, and the moving and static main contacts are used for In normal flow, the dynamic and static arc contacts are used for arc extinguishing, the static main contact has a channel extending along the plugging direction, and the static arc contact is located on the channel near the static contact At one end, the positions of the static main and arc contacts correspond to the movable main and arc contacts, the static arc contacts are movably assembled on the static main contacts, and the static arc contacts extend to the The static main contact and the moving arc contact extend beyond the moving main contact so that when closing, the moving arc contact and the static arc contact precede the moving main contact When the switch is opened, the moving arc contact and the static arc contact are separated after the moving main contact and the static main contact, and the moving arc contact Both the head and the static arc contact are coil magnetic field contacts.
The vacuum interrupter according to claim 1, the channel on the static main contact is a transparent channel, the static arc contact is connected to the static main contact through a static end bellows, and the static The end bellows isolates the passage from the outside at the end of the static arc contact away from the moving contact.
The vacuum interrupter according to claim 1 or 2, wherein the moving and static arc contacts are longitudinal magnetic field contacts, or the moving and static arc contacts are transverse magnetic field contacts.
The vacuum interrupter according to claim 1 or 2, wherein the movable main contact is in the shape of a cylinder with an open end, and is sleeved on the movable arc contact, the opening faces the static contact, and the movable arc contact The end of the head close to the static contact protrudes out of the moving main contact.
A vacuum circuit breaker includes an operating mechanism and a vacuum interrupter. The vacuum interrupter includes a housing, a static contact, and a moving contact connected to the operating mechanism, the moving contact including a moving main contact The static contact includes a static main contact and a static arc contact. An arc gap is provided between the moving main contact and the moving arc contact. The static main contact An arc isolation gap is provided between the static arc contact and the static main contact. The dynamic and static main contacts are used for normal flow, the dynamic and static arc contacts are used for arc extinguishing, and the static main contact has an edge The channel extending in the insertion direction, the static arc contact is provided at one end of the channel close to the static contact, the positions of the static main and arc contacts correspond to the movable main and arc contacts, the static The arc contact is movably assembled on the static main contact, the static arc contact extends beyond the static main contact and the moving arc contact extends beyond the moving main contact so that When closing, the moving arc contact and the static arc contact come into contact with the static main contact before the moving main contact, and when opening, the moving arc contact and the static arc The contact is separated from the static main contact after the moving main contact, and both the moving arc contact and the static arc contact are coil magnetic field contacts.
The vacuum circuit breaker according to claim 5, the passage on the static main contact is a transparent passage, the static arc contact is connected to the static main contact through a static end bellows, and the static end The bellows isolates the channel from the outside at the end of the static arc contact away from the moving contact.
The vacuum circuit breaker according to claim 5 or 6, wherein the moving and static arc contacts are longitudinal magnetic field contacts, or the moving and static arc contacts are transverse magnetic field contacts.
The vacuum circuit breaker according to claim 5 or 6, wherein the movable main contact is in the shape of a cylinder with an open end, and is sleeved on the movable arc contact, the opening faces the static contact, and the movable arc contact An end close to the static contact protrudes out of the moving main contact.