CN113675036A - Vacuum arc-extinguishing chamber contact structure with embedded Halbach array permanent magnet ring - Google Patents
Vacuum arc-extinguishing chamber contact structure with embedded Halbach array permanent magnet ring Download PDFInfo
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- CN113675036A CN113675036A CN202111077207.5A CN202111077207A CN113675036A CN 113675036 A CN113675036 A CN 113675036A CN 202111077207 A CN202111077207 A CN 202111077207A CN 113675036 A CN113675036 A CN 113675036A
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- contact
- permanent magnet
- magnet ring
- halbach array
- cup
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/664—Contacts; Arc-extinguishing means, e.g. arcing rings
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- High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
Abstract
The invention relates to a contact system of a vacuum arc extinguish chamber, in particular to a contact structure of the vacuum arc extinguish chamber with an embedded Halbach array permanent magnet ring, which consists of a conductive rod, a cup-shaped contact, the Halbach array permanent magnet ring and a contact blade, wherein the conductive rod is respectively and coaxially connected with the top end of the contact cup; the Halbach array permanent magnet ring is coaxially and tightly connected to the static contact cup and is made of neodymium iron boron materials, the magnetic field of the Halbach array permanent magnet ring and the magnetic field generated by current flowing through the contact cup are mutually overlapped, the magnetic field intensity of a contact gap is greatly enhanced, the magnetic blowing force of a structure is improved, the breaking capacity of an arc extinguishing system is improved, and a solution is provided for changing the condition that the breaking capacity of the arc extinguishing system is limited by the opening distance and the current at the present stage. In addition, the novel contact system is simple in structure, easy to assemble and high in mechanical strength, and is favorable for popularization and application in actual production.
Description
Technical Field
The invention relates to a contact structure of a vacuum circuit breaker, in particular to a contact structure of an arc extinguish chamber of the vacuum circuit breaker with an embedded Halbach array permanent magnet ring.
Background
The circuit breaker plays a role in protection and control in a power system, and the breaking performance of the circuit breaker is crucial to the stable operation of the system. The vacuum circuit breaker has the advantages of small volume, light weight, good breaking performance, high reliability and the like, has already occupied a leading position in the medium-voltage field, and is developing towards the direction of high voltage and large current at present. When the vacuum circuit breaker is switched on and off, the magnetic field between the contacts is regulated and controlled mainly through the contact structure, so that the purpose of arc extinction is achieved, and therefore the design of the contact structure of the vacuum circuit breaker is a key factor for determining the switching-on and switching-off capacity of the vacuum circuit breaker.
According to different action modes of the magnetic field on the electric arc, the contact structure can be divided into a transverse magnetic contact and a longitudinal magnetic contact. The transverse magnetic contacts can generate transverse magnetic fields, so that electric arcs generated between the contacts do rapid circular motion along the surfaces of the contacts under the driving of Lorentz force, the surface utilization rate of the electrodes is improved, the heat load generated by arc roots on the surfaces of the electrodes is reduced, and the partial serious melting of the surfaces of the contacts is prevented. However, the magnetic field of the transverse magnetic contact structure in the central area of the contact gap is weaker, the magnetic blowing force cannot meet the arc extinguishing requirement, and the requirement of a large-current on-off scene cannot be met. The longitudinal magnetic contact structure can generate a magnetic field along the current direction, so that the arc energy uniformly acts on the surface of the whole contact to reduce the arc voltage, the arc aggregation and the anode spot occurrence during the arcing period can be well inhibited during the current breaking, the ablation degree of the contact surface is lighter, and the breaking performance of the contact is better than that of a transverse magnetic contact under the scene of high voltage and large breaking current. Research shows that in the breaking process of the vacuum circuit breaker, along with the increase of the stroke of the contact, the magnetic field value is rapidly reduced, namely the control capability of the magnetic field on the electric arc is rapidly reduced, and in the arc extinguish chamber with long stroke, the magnetic field generated by the current flowing through the contact cannot well control the vacuum electric arc, so that a magnetism increasing method is required to effectively control and extinguish the vacuum electric arc so as to meet the breaking scene of large short-circuit current.
Disclosure of Invention
Object of the Invention
The invention aims to overcome the defects in the traditional longitudinal magnetic contact structure and designs a novel vacuum circuit breaker arc extinguish chamber contact structure with an embedded Halbach array permanent magnetic ring.
Technical scheme
The technical scheme of the invention is as follows: a novel vacuum circuit breaker arc extinguish chamber contact structure with an embedded Halbach array permanent magnet ring. The overall structure comprises a movable conducting rod, a static contact cup, a movable contact cup, a contact blade and a Halbach array permanent magnet ring, and is characterized in that: the static conductive rod (1) and the movable conductive rod (6) are respectively and coaxially connected to the tops of the static contact cup (2) and the movable contact cup (5); the static contact blade (3) and the moving contact blade (4) are respectively and coaxially connected to the bottoms of the static contact cup (2) and the moving contact cup (5).
Spiral grooves with the same direction are formed in the walls of the static contact cup (2) and the moving contact cup (5), and when current flows through the contact cup, a longitudinal magnetic field is generated at the contact gap. Meanwhile, the included angle between the spiral grooves on the cup walls of the static contact cup (2) and the moving contact cup (5) and the horizontal plane can be properly smaller, so that the longitudinal magnetic field of the contact gap can be enhanced.
The Halbach array permanent magnet ring (7) is coaxially and tightly connected with the static contact cup, the outer diameter of the Halbach array permanent magnet ring is slightly smaller than the inner diameter of the static contact cup (2), the Halbach array permanent magnet ring (7) is made of neodymium iron boron materials, the magnetism and the magnetic induction intensity of the Halbach array permanent magnet ring can be kept unchanged after the Halbach array permanent magnet ring is magnetized, and the longitudinal magnetic field intensity of a contact gap plane is greatly enhanced under the action of the magnetic field of the Halbach array permanent magnet ring. When the large current is cut off, the shrinkage of the electric arc and the appearance of anode spots are more favorably inhibited, meanwhile, the electric arc voltage is low and stable, the arcing energy is lowest, the burning degree of the contact surface is light, and the cutting-off capability of a contact system is favorably improved.
Advantages and effects
Compared with the prior art, the invention has the advantages and positive effects that:
aiming at the scene of large-current breaking, along with the increase of the opening distance between contacts, the control capability of the traditional contact system on electric arc is weakened due to the reduction of a magnetic field value, and a novel vacuum circuit breaker arc extinguish chamber contact structure with an embedded Halbach array permanent magnet ring is provided. The magnetic field generated by the contact structure and the magnetic field of the permanent magnet are mutually superposed, so that the magnetic induction intensity value of the contact gap is greatly improved, the control capability of the electric arc is enhanced, and the breaking capability of a contact system is improved.
Drawings
FIG. 1 is a structural diagram of a novel contact structure system
FIG. 2 is a cross-sectional view of a novel contact structure system
FIG. 3 is a structural diagram of a static contact cup and an embedded Halbach array permanent magnet ring
FIG. 4 is a structure diagram of a Halbach array permanent magnet ring
FIG. 5 is a schematic view of a Halbach array permanent magnet ring magnetic pole
Description of reference numerals:
1. static conductive rod, 2. static contact cup, 3. static contact blade, 4. moving contact blade, 5. moving contact cup, 6. moving conductive rod, 7. Halbach array permanent magnet
Detailed Description
The invention provides a novel vacuum circuit breaker arc extinguish chamber contact structure with an embedded Halbach array permanent magnet ring, and the invention is further explained by combining the attached drawings.
As shown in fig. 1, the static conductive rod 1 and the dynamic conductive rod 6 are respectively and coaxially connected to the static contact cup 2 and the dynamic contact cup 5, and the static contact blade 3 and the dynamic contact blade 4 are respectively and coaxially connected to the bottoms of the static contact cup 2 and the dynamic contact cup 5.
As shown in fig. 2, the embedded halbach array permanent magnet 7 is coaxially and tightly connected to the stationary contact cup 2, but is not tightly connected to the stationary contact piece.
As shown in fig. 3, the embedded halbach array permanent magnet 7 is made of a permanent magnet material, namely neodymium iron boron, and is used for enhancing the magnetic induction intensity value of the contact gap, and the outer diameter of the embedded halbach array permanent magnet is smaller than the inner diameter of the static contact cup 2.
As shown in fig. 4, the embedded halbach array permanent magnet 7 is composed of 12 closely-connected permanent magnets with the same size, and after the magnetizing is completed, the permanent magnets can generate a magnetic field in the contact gap, so that the original magnetic field distribution condition is changed, the magnetic induction intensity value of the contact gap is enhanced, and the arc aggregation and the occurrence of anode spots during the arc burning are suppressed.
As shown in fig. 5, which is a top view of the embedded halbach array permanent magnet 7, it is composed of 12 permanent magnets closely connected along the circumference, and the black dots on each permanent magnet show the direction of the magnet charging.
Claims (5)
1. A vacuum arc-extinguishing chamber contact structure with embedded Halbach array permanent magnet ring, the overall structure includes static conducting rod, static contact cup, static contact piece, Halbach array permanent magnet ring, movable contact piece, movable contact cup, movable conducting rod, its characterized in that: the static conductive rod (1) and the movable conductive rod (6) are respectively and coaxially connected to the tops of the static contact cup (2) and the movable contact cup (5); the static contact blade (3) and the moving contact blade (4) are respectively and coaxially connected to the bottoms of the static contact cup (2) and the moving contact cup (5).
2. The structure of claim 1, wherein the structure of the vacuum interrupter contact is a vacuum interrupter contact having an embedded halbach array permanent magnet ring, the structure comprising: the cup walls of the static contact cup and the movable contact cup are provided with spiral grooves in the same direction, and the included angle between the spiral grooves on the cup walls and the horizontal plane can be properly smaller so as to enhance the longitudinal magnetic field of the contact gap.
3. The structure of claim 1, wherein the structure of the vacuum interrupter contact is a vacuum interrupter contact having an embedded halbach array permanent magnet ring, the structure comprising: the embedded Halbach array permanent magnet ring structure is coaxially and tightly connected with the static contact cup, and the outer diameter of the embedded Halbach array permanent magnet ring structure is smaller than the inner diameter of the static contact cup.
4. The structure of claim 1, wherein the structure of the vacuum interrupter contact is a vacuum interrupter contact having an embedded halbach array permanent magnet ring, the structure comprising: the embedded Halbach array permanent magnet ring is made of neodymium iron boron materials and is used for enhancing the magnetic induction intensity value of the gap.
5. The structure of claim 1, wherein the structure of the vacuum interrupter contact is a vacuum interrupter contact having an embedded halbach array permanent magnet ring, the structure comprising: the Halbach array permanent magnet ring consists of 12 permanent magnets with the same size and different magnetizing directions, and the 12 permanent magnets are closely arranged along the circumferential direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111077207.5A CN113675036A (en) | 2021-09-15 | 2021-09-15 | Vacuum arc-extinguishing chamber contact structure with embedded Halbach array permanent magnet ring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111077207.5A CN113675036A (en) | 2021-09-15 | 2021-09-15 | Vacuum arc-extinguishing chamber contact structure with embedded Halbach array permanent magnet ring |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113675036A true CN113675036A (en) | 2021-11-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111077207.5A Pending CN113675036A (en) | 2021-09-15 | 2021-09-15 | Vacuum arc-extinguishing chamber contact structure with embedded Halbach array permanent magnet ring |
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| CN (1) | CN113675036A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114695015A (en) * | 2022-04-28 | 2022-07-01 | 西安交通大学 | Vacuum arc-extinguishing chamber based on Halbach permanent magnet longitudinal magnetic field |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107809034A (en) * | 2017-11-29 | 2018-03-16 | 绵阳旭立辰科技有限公司 | Magnetic quenching formula high-voltage electric connector |
| CN110120320A (en) * | 2019-06-06 | 2019-08-13 | 四川大学 | A kind of novel longitudinal magnetic contact system with embedded magnetism gathering rings and reversed contact cup |
| CN209515553U (en) * | 2018-12-11 | 2019-10-18 | 天津工业大学 | A kind of vacuum circuit breaker arc quenching system for indulging magnetic contact with mosaic type cup-shaped transverse cross |
-
2021
- 2021-09-15 CN CN202111077207.5A patent/CN113675036A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107809034A (en) * | 2017-11-29 | 2018-03-16 | 绵阳旭立辰科技有限公司 | Magnetic quenching formula high-voltage electric connector |
| CN209515553U (en) * | 2018-12-11 | 2019-10-18 | 天津工业大学 | A kind of vacuum circuit breaker arc quenching system for indulging magnetic contact with mosaic type cup-shaped transverse cross |
| CN110120320A (en) * | 2019-06-06 | 2019-08-13 | 四川大学 | A kind of novel longitudinal magnetic contact system with embedded magnetism gathering rings and reversed contact cup |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114695015A (en) * | 2022-04-28 | 2022-07-01 | 西安交通大学 | Vacuum arc-extinguishing chamber based on Halbach permanent magnet longitudinal magnetic field |
| CN114695015B (en) * | 2022-04-28 | 2024-05-17 | 西安交通大学 | Vacuum arc-extinguishing chamber based on longitudinal magnetic field of halbach permanent magnet |
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Application publication date: 20211119 |
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