Vacuum arc-extinguishing chamber contact with controllable magnetic field, vacuum arc-extinguishing chamber and control method

Abstract

The invention provides a vacuum arc-extinguishing chamber contact with a controllable magnetic field, a vacuum arc-extinguishing chamber and a control method, and the vacuum arc-extinguishing chamber contact comprises a contact body which is cylindrical and is hollow; the conducting rod is arranged at the upper end of the contact body; the coil is arranged in 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 mode and are parallel to the center line of the contact body; the conducting rod through grooves are distributed in the conducting rod in an annular array mode, are parallel to the center line of the conducting rod and are communicated with the contact through grooves. The contact body is provided with the contact through groove, the conducting rod is provided with the conducting rod through groove, the contact through groove is parallel to the parallel line of the contact body, the conducting rod through groove is parallel to the parallel line of the conducting rod, eddy current is reduced, the size and the coverage range of a magnetic field are guaranteed, and then vacuum arc extinguishing motion is controlled by adjusting the magnetic field.

Description

Technical Field

[0001] This invention relates to the field of vacuum interrupter technology, and in particular to a vacuum interrupter contact with a controllable magnetic field, a vacuum interrupter, and a control method. Background Technology

[0002] In power systems, switchgear plays a crucial role in controlling and protecting circuits, ensuring the safe transmission and distribution of power. Vacuum circuit breakers, with their advantages of being environmentally friendly, having high breaking capacity, and stable breaking performance, are widely used in power systems. The vacuum interrupter, as a key component of the vacuum circuit breaker, directly affects the reliability and lifespan of the switchgear. In traditional vacuum interrupters, transverse or longitudinal magnetic contacts are selected to improve arc-extinguishing capability and extend service life. However, once the contact structure is determined, the magnetic field between the contacts is also essentially fixed, making it impossible to flexibly control the vacuum arc-extinguishing motion by adjusting the magnetic field. This further restricts the improvement of the breaking current capability of vacuum circuit breakers.

[0003] In view of this, the present invention is hereby proposed. Summary of the Invention

[0004] The purpose of this invention is to provide a vacuum interrupter contact with a controllable magnetic field, a vacuum interrupter, and a control method. The problem that this invention aims to solve is that in the prior art, once the contact structure is determined, it is impossible to control the vacuum interruption movement by adjusting the magnetic field, which further restricts the improvement of the breaking current capability of the vacuum circuit breaker.

[0005] To achieve the above objectives, the present invention employs the following technical solution:

[0006] This invention provides a vacuum interrupter contact with a controllable magnetic field, comprising:

[0007] The contact body is cylindrical and hollow inside;

[0008] A conductive rod is disposed at the upper end of the contact body;

[0009] A coil, wherein the coil is disposed inside the contact body and wound around the axis of the contact body;

[0010] The contact slots are arranged in a ring array on the circumference of the contact body and are parallel to the center line of the contact body.

[0011] The conductive rod through slots are arranged in a ring array on the conductive rod and are parallel to the center line of the conductive rod, and are connected to the contact through slots.

[0012] Preferably, the conductive rod through groove is formed at the end of the conductive rod near the contact body, the length of the conductive rod through groove is 1:(1-3) of the diameter of the conductive rod, and the width of the conductive rod through groove is 1:(14-16) of the diameter of the conductive rod.

[0013] Preferably, the contact through slots are formed on 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.

[0014] Preferably, the coil is adapted to the shape of the contact body, the coil is disposed on the conductive rod, the outer diameter of the coil is less than or equal to the inner diameter of the contact body, and the inner diameter of the coil is greater than or equal to the diameter of the conductive rod.

[0015] 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.

[0016] Preferably, the coil has a support structure inside, and the support structure has support slots in the same number and position as the contact slots.

[0017] Preferably, the two ends of the coil are respectively connected to terminals, and the terminals extend from the contact through slot.

[0018] The present invention also provides a vacuum interrupter contact device, which includes a stationary contact and a moving contact. Both the stationary contact and the moving contact adopt the above-mentioned vacuum interrupter contact with a controllable magnetic field, and the stationary contact and the moving contact are coaxially arranged.

[0019] The present invention also provides a vacuum interrupter with a controllable magnetic field, which includes the above-mentioned vacuum interrupter contact device and a power supply;

[0020] The vacuum interrupter contact device includes a moving contact and a stationary contact. The power supply is electrically connected to the moving contact coil and the stationary contact coil to supply power to the moving contact and the stationary contact.

[0021] The present invention also provides a method for controlling a vacuum interrupter with a controllable magnetic field, which includes the following steps:

[0022] The power supply provides power to the vacuum interrupter contact device, which generates a magnetic field to perform vacuum interruption.

[0023] When current in the same direction is passed through the coils of the stationary contact and the moving contact, a radial magnetic field is generated.

[0024] When currents in opposite directions are passed through the coils of the stationary and moving contacts, an axial magnetic field is generated.

[0025] Compared with the prior art, the present invention has at least the following advantages:

[0026] This invention provides a vacuum interrupter contact with a controllable magnetic field, a vacuum interrupter, and a control method. The vacuum interrupter contact with a controllable magnetic field includes: a contact body, cylindrical and hollow inside; a conductive rod disposed on the upper end of the contact body; a coil disposed inside the contact body and wound around the axis of the contact body; contact slots, arranged in a ring array on the circumference of the contact body and parallel to the center line of the contact body; and conductive rod slots, arranged in a ring array on the conductive rod and parallel to the center line of the conductive rod, communicating with the contact slots. This invention reduces eddy currents and ensures the magnitude and coverage of the magnetic field by setting contact slots and conductive rod slots parallel to the center line of the conductive rod, thereby controlling the vacuum interruption movement by adjusting the magnetic field. Furthermore, the moving and stationary contacts provided by this invention can simultaneously apply radial and axial magnetic fields. Moreover, by adjusting the current magnitude and frequency of the coil, more types of magnetic fields can be generated, thus allowing for more flexible arc control and improving the arc-extinguishing capability of the vacuum interrupter. Attached Figure Description

[0027] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings.

[0028] In the attached diagram:

[0029] Figure 1 This is an isometric view of the contact body in the vacuum interrupter contact provided in Embodiment 1 of the present invention;

[0030] Figure 2 This is a cross-sectional view of the contact body in the vacuum interrupter contact provided in Embodiment 1 of the present invention;

[0031] Figure 3 This is a diagram illustrating the use of the axial magnetic field in the vacuum interrupter provided in Embodiment 3 of the present invention;

[0032] Figure 4 This is a diagram illustrating the use of the radial magnetic field in the vacuum interrupter provided in Embodiment 3 of the present invention.

[0033] in,

[0034] 1-Conductive rod; 2-Contact body; 3-Conductive rod through slot; 4-Terminal; 5-Contact through slot; 6-Support structure; 7-Coil; 8-Moving contact; 9-Stationary contact. Detailed Implementation

[0035] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0036] In the description of this application, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0038] Example 1

[0039] like Figure 1-4 As shown, this embodiment provides a vacuum interrupter contact with a controllable magnetic field. In this embodiment, by opening through slots on the coil, contact body 2, and conductive rod, the vacuum arc can exhibit different motion characteristics in axial or radial magnetic fields of different frequencies and magnitudes, thereby flexibly controlling the vacuum arc under different conditions and improving the current breaking capability of the vacuum circuit breaker.

[0040] like Figure 1 As shown, the vacuum interrupter contact includes a contact body 2, a conductive rod 1, and a coil 7. The contact body 2 is disposed at the lower end of the conductive rod 1, and the coil 7 is disposed inside the contact body 2. A conductive rod through groove 3 is provided on the conductive rod 1, and the conductive rod through groove 3 penetrates part of the contact body 2. For ease of description, in this embodiment, the part penetrating the contact body 2 is named the contact through groove 5. The contact through groove 5 and the conductive rod through groove 3 are parallel to the center line of the conductive rod 1.

[0041] The conductive rod 1 and the contact body 2 are coaxially arranged. Specifically, the diameter of the conductive rod 1 is 1 / 3 of the outer diameter of the contact body 2.

[0042] The contact body 2 and the conductive rod 1 are hollow inside. The ratio of the inner diameter to the outer diameter of the contact body 2 is 5:(4-7), and the ratio of the inner height to the outer height of the contact body 2 is 2:(1-3). In this embodiment, in order to achieve a better arc extinguishing effect, the ratio of the inner diameter to the outer diameter of the contact body 2 is 5:6, and the ratio of the inner height to the outer height of the contact body 2 is 2:3.

[0043] In this embodiment, the contact grooves 5 are evenly distributed on the upper and lower surfaces of the contact body 2, and the conductive rod grooves 3 are evenly distributed at the ends of the conductive rods 1 near the contact body 2. The number and width of the contact grooves 5 are the same as those of the conductive rod grooves 3. The length of the conductive rod groove 3 is 1:(1-3) of the diameter of the conductive rod 1, and the width of the conductive rod groove 3 is 1:(14-16) of the diameter of the conductive rod 1. In this embodiment, in order to achieve a better arc extinguishing effect, the groove length of the conductive rod groove 3 is 1 / 2 of the diameter of the conductive rod 1, the groove width of the conductive rod groove 3 is 1 / 15 of the diameter of the conductive rod 1, and the groove thickness of the conductive rod groove 3 is equal to the thickness of the conductive rod 1.

[0044] The width and number of the contact through groove 5 are exactly the same as those of the conductive rod through groove 3. The groove length of the contact through groove 5 is 1 / 2 of the outer diameter of the contact body 2. The groove depth of the contact through groove 5 is the outer height of the contact body 2. That is to say, the contact through groove 5 extends from the upper surface to the lower surface of the contact body 2. The thickness of the contact through groove 5 is the same as the thickness of the contact through groove 5.

[0045] like Figure 2 As shown, a coil 7 is disposed inside the contact body 2. The outer diameter of the coil 7 is less than or equal to the inner diameter of the contact body 2, and the inner diameter of the coil 7 is greater than or equal to the diameter of the conductive rod 1. In this embodiment, in order to achieve a better arc extinguishing effect, the outer diameter of the coil 7 is equal to the inner diameter of the contact body 2, the inner diameter of the coil 7 is equal to the diameter of the conductive rod 1, and the height of the coil 7 is equal to the inner height of the contact body 2. Terminals 4 are connected to both ends of the coil 7. The terminals 4 extend out of the contact body 2 from the contact through groove 5. The distance between the two terminals 4 is greater than the diameter of the conductive rod 1, and one of the two terminals 4 is close to the conductive rod 1 and the other is far away from the conductive rod 1.

[0046] A support structure 6 is also provided inside the coil 7. The diameter of the support structure 6 is the same as that of the conductive rod 1. The support structure 6 also has a support through groove. The position and number of the support through groove are the same as those of the contact through groove 5.

[0047] To further ensure the performance of the vacuum interrupter contact device in this embodiment, the contact is made of copper-chromium alloy, and the support structure 6 is made of either oxygen-free copper or stainless steel. In this embodiment, the support structure is made of oxygen-free copper, and the coil 7 is formed by an outer material wrapping an inner material. The outer material of the coil 7 is ceramic, and the inner material is copper wire.

[0048] Example 2

[0049] In this embodiment, a vacuum interrupter contact device is provided, which includes a stationary contact 9 and a moving contact 8. Both the moving contact 8 and the stationary contact 9 adopt the vacuum interrupter contact with a controllable magnetic field as mentioned in Embodiment 1. The stationary contact 9 and the moving contact 8 are coaxially arranged and are centrally symmetrical.

[0050] Example 3

[0051] In one embodiment, a vacuum interrupter with a controllable magnetic field is provided, which includes the vacuum interrupter contact device described in Embodiment 2 and a power supply, wherein the vacuum interrupter contact device is electrically connected to the power supply.

[0052] To further enhance understanding of this embodiment, a control method for a vacuum interrupter is provided, which includes the following steps:

[0053] The power supply provides power to the vacuum interrupter contact device, which generates a magnetic field to perform vacuum interruption motion.

[0054] In this embodiment, the moving contact 8 and the stationary contact 9 can be adapted to axial magnetic fields and radial magnetic fields, such as... Figure 3 As shown, when currents flow in opposite directions into the coil 7 in the moving contact 8 and the coil 7 in the stationary contact 9, the radial magnetic field in the arc gap is canceled out, leaving only the axial magnetic field. The axial magnetic field allows the arc to remain diffused, reducing the arc's erosion of the moving contact 8 and the stationary contact 9.

[0055] like Figure 4 As shown, when current flows into the coil 7 in the moving contact 8 and the coil 7 in the stationary contact 9 in the same direction, the axial magnetic field in the arc gap is canceled out, and only the radial magnetic field exists. The radial magnetic field allows the electric arc to move on the moving contact 8 and the stationary contact 9, reducing the ablation of the moving contact 8 and the stationary contact 9 by the electric arc.

[0056] In this invention, currents flowing in the same direction are simultaneously passed through the coils 7 in the stationary contact 9 and the moving contact 8, causing the stationary contact 9 and the moving contact 8 to generate magnetic fields in opposite directions, thereby forming a radial magnetic field in the middle. This causes the vacuum arc to rotate on the surfaces of the stationary contact 9 and the moving contact 8, reducing the ablation of the stationary contact 9 and the moving contact 8. Simultaneously, currents flowing in opposite directions are simultaneously passed through the coils 7 in the stationary contact 9 and the moving contact 8, causing the stationary contact 9 and the moving contact 8 to generate magnetic fields in the same direction, thereby forming an axial magnetic field in the middle of the stationary contact 9 and the moving contact 8. This causes the vacuum arc to exhibit a diffused state, reducing the ablation of the stationary contact 9 and the moving contact 8.

[0057] In this invention, by defining the structure and position of the coil 7, the conductive rod 1, and the contact body 2, as well as the size, width, and depth of the through slots opened thereon, the conductivity, mechanical strength, magnetic field size, and coverage of the vacuum interrupter contact device are ensured.

[0058] In this invention, the stationary contact 9 and the moving contact 8 are set to have the same shape and size, mainly to ensure the symmetry of the upper and lower magnetic fields and to ensure the arc-extinguishing capability of the vacuum interrupter.

[0059] In this invention, by changing the conduction time, current magnitude, and current frequency of the coil 7 in the moving contact 8 and the coil 7 in the stationary contact 9, more types of magnetic fields can be generated, thereby enabling more flexible control of the electric arc and improving the arc-extinguishing capability of the vacuum interrupter.

[0060] In this invention, by uniformly opening conductive rod through slots 3, contact through slots 5 and support through slots in the same number and position on the conductive rod 1, the contact body 2 and the support structure 6, eddy currents are reduced, the magnitude of the magnetic field generated by the coil 7 is increased, and the phase of the magnetic field lags the current.

[0061] In this invention, the magnetic field of the vacuum interrupter is provided by the coil 7 inside the contact body 2. However, the current frequency in the coil 7 is very high, which leads to an increase in eddy currents and affects the use. Therefore, in order to ensure the magnitude of the magnetic field, in this embodiment, the conductive rod through slot 3, the contact through slot 5 and the support through slot are set as vertical slots to reduce eddy currents without affecting the magnitude of the magnetic field, thus avoiding the magnetic field generated by the coil 1 being too small and affecting the use.

[0062] Example 4

[0063] This embodiment provides a vacuum interrupter contact structure, such as... Figures 1 to 2 As shown, the vacuum interrupter contact structure includes:

[0064] Conductive rod 1, such as Figure 1 As shown, it has a diameter D1, and the bottom end of the conductive rod 1 has several slots, such as... Figure 1As shown in Figure 3, the groove length is D1 / 2, the groove width is D1 / 15, and the groove depth is H1;

[0065] Contact body 2, such as Figure 1 As shown, it is located at the bottom end of the conductive rod 1; the contact body 2 is hollow inside, with an internal diameter and an external diameter of D2 and D3 respectively, D2:D3=5:6, and an internal height and an external height of H2 and H3 respectively, H2:H3=2:3; the upper and lower surfaces of the contact body 2 are slotted, the position and number of the slots are the same as those of the conductive rod 1, the slot length is D3 / 2, the slot width is the same as those of the conductive rod 1, and the slot depth is the external height H3 of the contact body 2;

[0066] Coil 7 is located inside the contact body 2. The interior of coil 7 is made of copper wire, such as... Figure 2 As shown, the exterior is wrapped in ceramic, as Figure 2 As shown, the outer diameter of coil 7 is equal to the inner diameter D2 of contact body 2, the inner diameter of coil 7 is equal to the diameter D1 of conductive rod 1, the height of coil 7 is equal to the inner height H2 of coil 7, and coil 7 has two terminals 4, as shown. Figure 1 As shown, they extend from two opposite grooves on the upper surface of the contact body 2, respectively;

[0067] Supporting structures, such as Figure 2 As shown, it is set in the middle of coil 7, with a support diameter of D1 and a support height of H2, which is the internal height of contact body 2. The support structure is slotted, and the position and number of slots are exactly the same as the slots on conductive rod 1.

[0068] In one embodiment, several slots of the same number and position are evenly distributed on the contact body 2, the conductive rod 1, and the support structure. This can greatly reduce eddy currents, thereby increasing the magnitude of the magnetic field generated by the coil 7 and reducing the phase lag of the magnetic field behind the current.

[0069] Figure 3 This is a schematic diagram of the axial magnetic field of one embodiment of the vacuum interrupter contact structure. When currents flowing in opposite directions are passed through the moving and stationary contact coils 7, the radial magnetic field in the arc gap is canceled out, leaving only the axial magnetic field. The axial magnetic field allows the arc to remain diffused, reducing the erosion of the contact body 2 by the arc.

[0070] Figure 4 This is a schematic diagram of the radial magnetic field of one embodiment of the vacuum interrupter contact structure. When current flows in the same direction through the moving and stationary contact coils 7, the axial magnetic field in the arc gap is canceled out, and only the radial magnetic field exists. The radial magnetic field allows the arc to move on the surface of the contact body 2, reducing the ablation of the contact body 2 by the arc.

[0071] By changing the conduction time, current magnitude, and current frequency of coil 7, more types of magnetic fields can be generated, thereby allowing for more flexible control of the electric arc and improving the arc-extinguishing capability of the vacuum interrupter.

[0072] When a high-frequency current flows through the coil 7, the present invention creates slots in the contact body 2, the conductive rod 1, and the support structure. This can greatly reduce eddy currents, thereby increasing the magnitude of the magnetic field generated by the coil 7 and reducing the lag of the magnetic field behind the current phase.

[0073] During the opening process of the contact body 2, the current in the coil 7 of the moving and stationary contacts 9 can be flexibly controlled, thereby generating various magnetic fields and flexibly controlling the vacuum arc. Simultaneously flowing currents in the same direction through the coils 7 of the moving contact 8 and the stationary contact 9 generate magnetic fields in opposite directions in the two contact bodies 2, forming a radial magnetic field in the middle of the contact bodies 2. This causes the vacuum arc to rotate on the surface of the contact bodies 2, reducing contact body 2 ablation. Simultaneously flowing currents in opposite directions through the coils 7 of the moving contact 8 and the stationary contact 9 generate magnetic fields in the same direction in the two contact bodies 2, forming an axial magnetic field in the middle of the contact bodies 2. This causes the vacuum arc to diffuse, reducing contact body 2 ablation. Changing the conduction time, current magnitude, and current frequency of the coil 7 can generate even more types of magnetic fields, thus allowing for more flexible arc control and improving the arc-extinguishing capability of the vacuum interrupter.

[0074] Finally, it should be noted that the above descriptions are merely preferred embodiments of this application and are not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A vacuum interrupter contact with a controllable magnetic field, characterized in that, include: The contact body is cylindrical and hollow inside; A conductive rod is disposed at the upper end of the contact body; A coil, wherein the coil is disposed inside the contact body and wound around the axis of the contact body; The contact slots are arranged in a ring array on the circumference of the contact body and are parallel to the center line of the contact body. The conductive rod through slots are arranged in a ring array on the conductive rod and are parallel to the center line of the conductive rod, and are connected to the contact through slots.

2. The vacuum interrupter contact according to claim 1, characterized in that, The conductive rod through groove is formed at the end of the conductive rod near the contact body. The length of the conductive rod through groove is 1:(1-3) of the diameter of the conductive rod, and the width of the conductive rod through groove is 1:(14-16) of the diameter of the conductive rod.

3. The vacuum interrupter contact according to claim 2, characterized in that, The contact slots are formed on the upper and lower surfaces of the contact body, and the number and width of the contact slots are the same as the number of conductive rod slots.

4. The vacuum interrupter contact according to claim 1, characterized in that, The coil is adapted to the shape of the contact body, the coil is disposed on the conductive rod, the outer diameter of the coil is less than or equal to the inner diameter of the contact body, and the inner diameter of the coil is greater than or equal to the diameter of the conductive rod.

5. The vacuum interrupter contact according to claim 1, characterized in that, The ratio of the inner diameter to the outer diameter of the contact body is 5:(4-7), and the ratio of the inner height to the outer height of the contact body is 2:(1-3).

6. The vacuum interrupter contact according to claim 1, characterized in that, The coil has a support structure inside, and the support structure has support slots with the same number and position as the contact slots.

7. The vacuum interrupter contact according to claim 4, wherein the two ends of the coil are respectively connected to terminals, and the terminals extend from the through groove of the contact.

8. A vacuum interrupter contact device, characterized in that, It includes a stationary contact and a moving contact, both of which are vacuum interrupter contacts with controllable magnetic fields as described in any one of claims 1-7, and the stationary contact and the moving contact are coaxially arranged.

9. A vacuum interrupter with a controllable magnetic field, characterized in that, Includes the vacuum interrupter contact device as described in claim 8, and a power supply; The vacuum interrupter contact device includes a moving contact and a stationary contact. The power supply is electrically connected to the coil of the moving contact and the coil of the stationary contact to supply power to the moving contact and the stationary contact.

10. A method for controlling a vacuum interrupter with a controllable magnetic field, characterized in that, Includes the following steps: The power supply provides power to the vacuum interrupter contact device, which generates a magnetic field to perform vacuum interruption. When current in the same direction is passed through the coils of the stationary contact and the moving contact, a radial magnetic field is generated. When currents in opposite directions are passed through the coils of the stationary and moving contacts, an axial magnetic field is generated.

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