CN-122000232-A - Vacuum arc-extinguishing chamber contact capable of controlling magnetic field, vacuum arc-extinguishing chamber and control method

CN122000232ACN 122000232 ACN122000232 ACN 122000232ACN-122000232-A

Abstract

The invention provides a vacuum arc-extinguishing chamber contact capable of controlling a magnetic field, a vacuum arc-extinguishing chamber and a control method, wherein the vacuum arc-extinguishing chamber contact comprises a contact body, a conducting rod, a coil, a contact through groove and a conducting rod through groove, wherein the cylindrical contact body is hollow, the conducting rod is arranged at the upper end of the contact body, the coil is arranged inside the contact body and is wound on the axis of the contact body, the contact through groove is distributed in the circumferential direction of the contact body and is parallel to the central line of the contact body, and the conducting rod through groove is distributed on the conducting rod in an annular array and is parallel to the central line of the conducting rod and is communicated with the contact through groove. According to the invention, the contact through grooves are formed in the contact body, the conductive rod through grooves are formed in the conductive rod, the contact through grooves are parallel to parallel lines of the contact body, and the conductive rod through grooves are parallel to parallel lines of the conductive rod, so that eddy currents are reduced, the size and coverage range of a magnetic field are ensured, and further, the vacuum arc extinguishing movement is controlled by adjusting the magnetic field.

Inventors

ZHOU WANDI
ZHANG SHENG
GAO CHONG
WU YIFEI
YUAN ZHE
LIU YUAN
YANG SHUNYAO

Assignees

国网智能电网研究院有限公司
中国电力科学研究院有限公司

Dates

Publication Date: 20260508
Application Date: 20241108

Claims (10)

1. A vacuum interrupter contact of controllable magnetic field, comprising: The contact body is cylindrical and hollow; the conducting rod is arranged at the upper end of the contact body; The coil is arranged inside the contact body and is wound on the axis of the contact body; the contact through grooves are distributed in the circumferential direction of the contact body in an annular array manner and are parallel to the central line of the contact body; the conducting rod through grooves are distributed on the conducting rod in an annular array mode and are parallel to the central line of the conducting rod, and the conducting rod through grooves are communicated with the contact.
2. The vacuum interrupter contact of claim 1, wherein the conductive rod through slot is formed at an end of the conductive rod near the contact body, the conductive rod through slot has a length of 1 (1-3) of the conductive rod diameter, and the conductive rod through slot has a width of 1 (14-16) of the conductive rod diameter.
3. The vacuum interrupter contact of claim 2, wherein the contact through slots are formed in the upper and lower surfaces of the contact body, and the number and width of the contact through slots are the same as the number of the conductive rod through slots.
4. The vacuum interrupter contact of claim 1, wherein the coil is shaped to fit the contact body, the coil is disposed on the conductive rod, an outer diameter of the coil is less than or equal to an inner diameter of the contact body, and an inner diameter of the coil is greater than or equal to a diameter of the conductive rod.
5. The vacuum interrupter contact of claim 1, wherein the contact body has a ratio of inner diameter to outer diameter of 5 (4-7) and a ratio of inner height to outer height of 2 (1-3).
6. The vacuum interrupter contact of claim 1, wherein a support structure is disposed inside the coil, and support through slots having the same number and positions as the contact through slots are formed in the support structure.
7. The vacuum interrupter contact of claim 4, wherein terminals are connected to each of the ends of the coil, and extend from the contact through slots.
8. The vacuum interrupter contact device is characterized by comprising a fixed contact and a moving contact, wherein the fixed contact and the moving contact are both vacuum interrupter contacts with controllable magnetic fields according to any one of claims 1-7, and the fixed contact and the moving contact are coaxially arranged.
9. A vacuum interrupter with controllable magnetic field, comprising the vacuum interrupter contact device of claim 8, a power source; The vacuum arc-extinguishing chamber contact device comprises a moving contact and a fixed contact, wherein the power supply is electrically connected with a coil of the moving contact and a coil of the fixed contact to supply power for the moving contact and the fixed contact.
10. The control method of the vacuum arc extinguishing chamber capable of controlling the magnetic field is characterized by comprising the following steps: the power supply supplies power to the vacuum arc-extinguishing chamber contact device, and the vacuum arc-extinguishing chamber contact device generates a magnetic field to perform vacuum arc extinguishing; when the coils in the fixed contact and the moving contact are electrified with current in the same direction, a radial magnetic field is generated; When the coils in the fixed contact and the moving contact are electrified with current in opposite directions, an axial magnetic field is generated.

Description

Vacuum arc-extinguishing chamber contact capable of controlling magnetic field, vacuum arc-extinguishing chamber and control method Technical Field The invention relates to the technical field of vacuum arc-extinguishing chambers, in particular to a vacuum arc-extinguishing chamber contact capable of controlling a magnetic field, a vacuum arc-extinguishing chamber and a control method. Background In an electric power system, a switching device is used for controlling and protecting a circuit, ensuring safe transmission and distribution of electric power, and plays a vital role. The vacuum circuit breaker has the advantages of environmental protection, strong breaking capacity, stable breaking and the like, and is widely applied to power systems. The performance of a vacuum interrupter, which is a key component of a vacuum circuit breaker, directly affects the reliability and lifetime of the switchgear. In the original vacuum arc-extinguishing chamber, the contact selects a transverse magnetic contact or a longitudinal magnetic contact so as to improve the arc-extinguishing capability and prolong the service life. However, when the structure of the contacts is determined, the magnetic field between the contacts is also basically determined, and the vacuum arc extinguishing movement cannot be flexibly controlled by adjusting the magnetic field, which further restricts the improvement of the current breaking capacity of the vacuum circuit breaker. In view of this, the present invention has been made. Disclosure of Invention The invention aims to provide a vacuum arc-extinguishing chamber contact capable of controlling a magnetic field, a vacuum arc-extinguishing chamber and a control method, and aims to solve the problem that after the contact structure is determined in the prior art, the vacuum arc-extinguishing movement cannot be controlled by adjusting the magnetic field, so that the improvement of the current breaking capacity of a vacuum circuit breaker is further restricted. In order to achieve the above purpose, the present invention adopts the following technical scheme: the invention provides a vacuum arc-extinguishing chamber contact capable of controlling a magnetic field, which comprises: The contact body is cylindrical and hollow; the conducting rod is arranged at the upper end of the contact body; The coil is arranged inside the contact body and is wound on the axis of the contact body; the contact through grooves are distributed in the circumferential direction of the contact body in an annular array manner and are parallel to the central line of the contact body; the conducting rod through grooves are distributed on the conducting rod in an annular array mode and are parallel to the central line of the conducting rod, and the conducting rod through grooves are communicated with the contact. Preferably, the conducting rod through groove is formed in the end part, close to the contact body, of the conducting rod, the length of the conducting rod through groove is 1 (1-3) of the diameter of the conducting rod, and the width of the conducting rod through groove is 1 (14-16) of the diameter of the conducting rod. Preferably, the contact through grooves are formed in the upper surface and the lower surface of the contact body, and the number and the width of the contact through grooves are the same as those of the conductive rod through grooves. Preferably, the coil is matched with the shape of the contact body, the coil is arranged on the conducting rod, the outer diameter of the coil is smaller than or equal to the inner diameter of the contact body, and the inner diameter of the coil is larger than or equal to the diameter of the conducting rod. Preferably, the ratio of the inner diameter to the outer diameter of the contact body is 5 (6-7), and the ratio of the inner height to the outer height of the contact body is 2:3. Preferably, a supporting structure is arranged in the coil, and supporting through grooves with the same number and positions as the contact through grooves are formed in the supporting structure. Preferably, two ends of the coil are respectively connected with a wiring terminal, and the wiring terminals extend out of the contact through grooves. The invention also provides a vacuum arc-extinguishing chamber contact device which comprises a fixed contact and a moving contact, wherein the fixed contact and the moving contact adopt the vacuum arc-extinguishing chamber contact with the controllable magnetic field, and the fixed contact and the moving contact are coaxially arranged. The invention also provides a vacuum arc-extinguishing chamber with controllable magnetic field, which comprises the vacuum arc-extinguishing chamber contact device and a power supply; The vacuum arc-extinguishing chamber contact device comprises a moving contact and a fixed contact, wherein the power supply is electrically connected with the moving contact coil and the fixed contact coil to supply power