Vacuum circuit breaker contact with built-in reverse conductor and vacuum circuit breaker

Abstract

The invention discloses a vacuum circuit breaker contact with a built-in reverse conductor, and relates to the technical field of vacuum circuit breakers. The vacuum circuit breaker contact with the built-in reverse conductor comprises a contact blade, a contact cup, a conducting rod, the reverse conductor and a supporting structure, the contact blade is connected with the top of the contact cup, the conducting rod is connected with the contact cup, the reverse conductor is arranged in the contact cup, and the supporting structure is connected with a circuit breaker shell through an insulating rod to ensure that the position of the supporting structure is relatively fixed. A through groove is formed in the bottom of the contact cup, the contact cup corresponds to the supporting structure penetrating through the through groove, a plurality of first spiral grooves are formed in the side wall of the contact cup, a plurality of second spiral grooves are formed in the side wall of the reverse conductor, and the rotating direction of the second spiral grooves is opposite to that of the first spiral grooves. The vacuum circuit breaker adopts a vacuum circuit breaker contact with a built-in reverse conductor. The direct-current vacuum circuit breaker can solve the problem that the interpolar residual magnetism affects the breaking effect when the direct-current vacuum circuit breaker is broken in the prior art, and the breaking performance and reliability of the direct-current vacuum circuit breaker are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of vacuum circuit breakers, and in particular to a vacuum circuit breaker contact with a built-in reverse conductor and a vacuum circuit breaker. Background Art

[0002] With the continuous development of new power systems, multi-terminal direct current (HVDC) transmission systems have attracted widespread attention due to their advantages, including flexible networking, efficient transmission, precise control, high reliability, and intensive environmental protection. The development of DC circuit breakers is particularly important in the development of multi-terminal direct current (HVDC) transmission systems. Among various DC circuit breakers, mechanical DC vacuum circuit breakers have become the mainstream research direction due to their low cost, high breaking capacity, and high reliability.

[0003] Currently, arcing is unavoidable during vacuum interruption. The forced zero-crossing technology used in mechanical vacuum DC circuit breakers generates extremely strong eddy currents within the conductors. Due to the significant hysteresis in the interpole magnetic field, residual magnetism between the poles when the current passes zero can severely impact the effective interruption of the DC vacuum arc. This residual magnetism can even cause the arc to re-strike (reignite) after the current passes zero, leading to interruption failure or even overvoltage, posing a serious threat to equipment. To mitigate the interpole residual magnetism during current zero crossings, mechanical DC vacuum circuit breakers have explored contact structure optimization methods that can effectively improve the magnetic field distribution characteristics in the DC interruption arc zone. These methods include using laminated structures to reduce the eddy current path or employing non-magnetic materials (such as stainless steel) to reduce the conductivity of the eddy current loop. However, these structural optimization methods do not fundamentally overcome the significant residual magnetism present during current zero crossings in DC circuit breakers, compared to AC circuit breakers.

[0004] Therefore, the existing technology needs to be improved. Summary of the Invention

[0005] The technical problem to be solved by the present invention is that the residual magnetism of the vacuum DC circuit breaker in the prior art will seriously affect the switching effect. The purpose is to provide a vacuum circuit breaker contact and a vacuum circuit breaker with a built-in reverse conductor. The corresponding technical solution has the beneficial effects of reducing the residual magnetism effect and improving the circuit breaker performance, thereby improving the breaking performance and reliability of the DC vacuum circuit breaker.

[0006] The present invention is achieved through the following technical solutions: In a first aspect, the present invention provides a vacuum circuit breaker contact with a built-in reverse conductor, which includes a contact piece, a contact cup, a conductive rod, a reverse conductor and a supporting structure. The contact piece is connected to the top of the contact cup, the conductive rod is connected to the bottom of the contact cup, the reverse conductor is arranged inside the contact cup, the support structure is connected to the circuit breaker housing through an insulating rod to ensure that its position is relatively fixed, the support structure is movably connected to the reverse conductor and always maintains electrical connection, the bottom of the contact cup is provided with a through slot for inserting the support structure, the contact cup corresponds to the support structure passing through the through slot, The side wall of the contact cup is provided with a plurality of first spiral grooves, and the side wall of the reverse conductor is provided with a plurality of second spiral grooves, wherein the rotation direction of the second spiral grooves is opposite to that of the first spiral grooves.

[0007] In the above technical solution, when the vacuum circuit breaker initially opens, the moving and static contacts have just separated, and the breaking current is close to the peak current. At this time, the current in the vacuum circuit breaker contact with the built-in reverse conductor flows through the contact piece to the contact cup and then into the conductive rod. When flowing through the spiral structure of the contact cup, it forms a clockwise eddy current. This current generates a longitudinal magnetic field between the poles, pointing from the anode to the cathode. This longitudinal magnetic field can optimize the magnetic field distribution and achieve effective control of the arc. As the vacuum circuit breaker mechanism continues to operate, the vacuum circuit breaker contact with the built-in reverse conductor moves downward to a certain position. The support structure will exert an upward support force on the reverse conductor, lifting the contact piece so that the contact piece no longer contacts the contact cup. At this time, the current in the vacuum circuit breaker contact with the built-in reverse conductor flows through the contact piece to the internal reverse conductor, then flows to the support structure and finally into the conductive rod. When current flows through the internal reverse conductor, eddy currents in a counterclockwise direction are formed, generating a longitudinal magnetic field between the poles from the cathode to the anode. This longitudinal magnetic field can effectively offset the residual magnetic field between the poles at this time. The vacuum circuit breaker significantly reduces the residual magnetic field between the poles when the current is close to zero.

[0008] Furthermore, in the present invention, an insulating sliding connection is provided between the contact cup and the contact piece.

[0009] Furthermore, in the present invention, the above-mentioned insulating sliding connector is configured as an insulating sliding rod.

[0010] Furthermore, in the present invention, the above-mentioned support structure includes a sleeve arranged on the outside of the conductive rod, the top of the sleeve is provided with a support rod inserted into the through groove and corresponding to the bottom surface of the contact cup, and the bottom of the sleeve is provided with a bottom plate, and the bottom plate is provided with a through hole for the conductive rod to pass through.

[0011] In the above technical solution, the structural design can ensure that the supporting structure stably supports the reverse conductor and realizes relative sliding with the conductive rod.

[0012] Furthermore, in the present invention, the through hole is provided with a brush in contact with the conductive rod, and the through slot is provided with a brush in contact with the support structure.

[0013] In the above technical solution, the arrangement of the brushes can ensure good electrical connection between the conductive rod and the supporting structure, and can ensure stable electrical conduction even during relative sliding.

[0014] Furthermore, in the present invention, the above-mentioned brush is configured as a graphite brush.

[0015] In the above technical solution, the graphite brush has good conductivity and wear resistance, and can meet long-term sliding conductivity requirements.

[0016] Furthermore, in the present invention, the contact piece is provided with a strip-shaped hole extending from the edge toward the center, and the outer end of the strip-shaped hole corresponds to the top end of the first spiral groove.

[0017] In the above technical solution, the connection between the strip hole and the first spiral groove is equivalent to extending the first spiral groove, which can improve the inter-pole magnetic field distribution characteristics, weaken the inter-pole residual magnetism when the current passes through zero, and improve the breaking capacity of the vacuum arc.

[0018] Furthermore, in the present invention, the number of the first spiral groove, the second spiral groove, and the strip-shaped holes is the same and they are evenly distributed around the center, and the strip-shaped holes are configured as straight strip-shaped holes.

[0019] In the above technical solution, the evenly distributed first spiral grooves, the second spiral grooves, and the strip-shaped holes can make the magnetic field distribution more even, thereby improving the breaking performance.

[0020] Furthermore, in the present invention, the material of the aforementioned reverse conductor is copper-chromium alloy.

[0021] In the above technical solution, the copper-chromium alloy has good electrical conductivity and arc erosion resistance, and can meet the use requirements of the reverse conductor under complex working conditions.

[0022] In a second aspect, the present invention further provides a vacuum circuit breaker, which uses a vacuum circuit breaker contact with a built-in reverse conductor.

[0023] Compared with the prior art, the present invention has the following advantages and beneficial effects: 1. By installing a counter-conductor inside the contact cup, with the second spiral groove of the counter-conductor rotating in the opposite direction to the first spiral groove of the contact cup, a counter-current is generated during disconnection. At the zero-crossing moment, the counter-current effectively offsets the residual magnetic field between the poles, greatly reducing the possibility of arc reignition and significantly improving the interruption reliability of the DC vacuum circuit breaker.

[0024] 2. The support structure stably supports the movement of the reverse conductor through the design of the sleeve, support rod and base plate, and maintains a good sliding electrical connection with the conductive rod through the brush, ensuring the stability and conductivity of the reverse conductor during operation.

[0025] 3. The strip-shaped hole on the contact piece corresponds to the first spiral groove, which is conducive to guiding the arc movement and coordinating with the magnetic field distribution, thereby improving the arc extinguishing effect and further improving the breaking performance of the vacuum circuit breaker.

[0026] 4. Copper-chromium alloy is used as the material of the reverse conductor. Its good conductivity and arc erosion resistance ensure the reliable operation of the reverse conductor under complex working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the following briefly introduces the drawings required for use in the examples. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be considered as limiting the scope. A person of ordinary skill in the art can also derive other relevant drawings based on these drawings without inventive effort. In the drawings: Figure 1 A schematic diagram of a vacuum circuit breaker contact with a built-in reverse conductor according to the present invention; Figure 2 A schematic cross-sectional view of a vacuum circuit breaker contact with a built-in reverse conductor according to the present invention; Figure 3 is a schematic diagram of the support structure of the present invention; Figure 4 It is a schematic diagram of the end face of the contact piece of the present invention.

[0028] The marks and corresponding parts names in the accompanying drawings are: 1-contact piece, 101-bar hole, 2-contact cup, 201-first spiral groove, 202-through groove, 3-conductive rod, 4-reverse conductor, 401-second spiral groove, 5-support structure, 501-sleeve, 502-support rod, 503-base plate, 5031-through hole, 6-insulating sliding connector. DETAILED DESCRIPTION

[0029] In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments and drawings. The schematic embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention. The following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0030] It should be noted that similar numbers and letters represent similar items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of the embodiments of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "setting", "installation" and "connection" should be understood in a broad sense. For example, it 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 it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0031] Example 1 Combine Figures 1 to 4 As shown, a vacuum circuit breaker contact with a built-in reverse conductor is provided in an embodiment of the present invention, and the specific structure is described as follows.

[0032] Combine Figure 1 As shown, the vacuum circuit breaker contact with a built-in reverse conductor in embodiment 1 of the present invention mainly includes five parts: a contact piece 1, a contact cup 2, a conductive rod 3, a reverse conductor 4 and a support structure 5. The vacuum circuit breaker contact with a built-in reverse conductor mainly serves as a moving contact in the circuit breaker and has a good breaking effect.

[0033] In some implementations of this embodiment, Figure 1 As shown, the contact piece 1 is a circular metal piece that plays the role of contact and conduction.

[0034] Further, combined Figure 1 and Figure 2 As shown, the contact cup 2 is a circular cup with a cavity inside, which is used to provide a mounting position for other components. The outer diameter of the contact cup 2 is the same as that of the contact piece 1, and the contact piece 1 is mounted at the top opening of the contact cup 2.

[0035] It should be noted that an insulating sliding connector 6 is installed between the contact cup 2 and the contact piece 1. The insulating sliding connector 6 can be an insulating sliding rod. The top of the contact cup 2 and the contact piece 1 are provided with a slot connected to the insulating sliding connector 6. The insulating sliding rod is fixed to the slot of the contact piece 1 and is slidably connected to the slot of the contact cup 2. After the insulating sliding connector 6 is installed, when the vacuum circuit breaker contact with a built-in reverse conductor, which serves as the moving contact, moves to a certain position, the contact cup 2 and the contact piece 1 separate. After the circuit breaker is completely disconnected and reset, the contact piece 1 and the contact cup 2 are reunited. The insulating sliding connector 6 is provided to maintain the integrity of the vacuum circuit breaker contact with a built-in reverse conductor. In addition, during the initial period of disconnection, due to hysteresis, the magnetic flux density generated by the forward eddy current in the vacuum circuit breaker contact with a built-in reverse conductor will not be too large, so there is no need to use a reverse path to weaken it.

[0036] In some implementations of this embodiment, Figure 2 As shown, the reverse conductor 4 is made of copper-chromium alloy material and is installed in the cavity of the contact cup 2. The structure of the reverse conductor 4 is similar to that of the contact cup 2, and is also a circular cup. The side wall of the contact cup 2 is provided with a first spiral groove 201, and the side wall of the reverse conductor 4 is provided with a second spiral groove 401. The rotation direction of the second spiral groove 401 is opposite to that of the first spiral groove 201, so that the reverse conductor 4 generates a current in the opposite direction to the eddy current inside the contact cup 2. The magnetic field generated by the reverse conductor 4 can offset the magnetic field generated by the eddy current inside the contact cup 2, significantly reducing the inter-pole residual magnetic field when the current is close to zero.

[0037] Further, combined Figure 1 and Figure 4 As shown, a linear strip hole 101 is formed on the surface of the contact piece 1, extending from the edge toward the center of the contact piece 1. The edge (i.e., the outer end) of the strip hole 101 is aligned with the top of the first spiral groove 201 on the contact cup 2. The strip hole 101 is connected to the first spiral groove 201, which is equivalent to extending the first spiral groove 201. This helps improve the distribution characteristics of the magnetic field between the poles, weakens the residual magnetism between the poles at the time of current zero crossing, and enhances the interruption capability of the vacuum arc.

[0038] Furthermore, in this embodiment, the number of the first spiral groove 201, the second spiral groove 401, and the strip-shaped hole 101 are all set to four, and are evenly distributed around the center of the contact cup 2. The centers of the contact piece 1, the contact cup 2, and the counter conductor 4 are coaxial.

[0039] In this embodiment, combined with Figure 2 and Figure 3As shown, a support structure 5 is mounted below the contact cup 2. The support structure 5 includes a sleeve 501 that fits over the conductive rod 3. A base plate 503 is mounted at the bottom of the sleeve 501. A through-hole 5031 is defined in the center of the base plate 503, through which the conductive rod 3 passes. To ensure relative sliding between the conductive rod 3 and the support structure 5 and maintain electrical connection, a graphite brush is mounted in the through-hole 5031 and connected to the outer wall of the conductive rod 3.

[0040] Furthermore, four through slots 202 are provided at the bottom of the contact cup 2 , and the bottom surface of the reverse conductor 4 covers the four through slots 202 . Four support rods 502 are installed on the top of the corresponding sleeve 501 , and the support rods 502 can be inserted into the through slots 202 and lift the reverse conductor 4 .

[0041] During installation, first, install the insulating slide rod 7 between the contact cup 2 and the contact piece 1 to ensure that the insulating slide rod can play a normal buffering role. Place the reverse conductor 4 inside the contact cup 2, and the second spiral groove 401 of the reverse conductor 4 is opposite to and corresponds to the first spiral groove 201 of the contact cup 2. Install the support structure 5, put the sleeve 501 on the outside of the conductive rod 3, insert the support rod 502 into the through groove 202 at the bottom of the contact cup 2, and the through hole 5031 on the bottom plate 503 passes through the conductive rod 3, and install a graphite brush in the through hole 5031 to ensure good electrical connection and stable support between the support structure 5 and the conductive rod 3 and the reverse conductor 4. Install the assembled contact as a whole into the vacuum circuit breaker, and connect and fix the support structure 5 to the circuit breaker housing through the insulating rod to ensure that the position is relatively stable.

[0042] The working process is as follows: when the vacuum circuit breaker is in the closed state, the current forms the main current path through the conductive rod 3, contact cup 2, and contact piece 1. When the current needs to be interrupted, the contact piece 1 and contact cup 2 gradually separate. At the moment when the current passes through zero, the reverse magnetic field generated by the reverse conductor 4 can effectively offset the residual magnetism between the poles, greatly reducing the risk of arc reignition and ensuring that the vacuum circuit breaker can reliably interrupt the current. Throughout the interruption process, the support structure 5 maintains a good sliding electrical connection with the conductive rod 3 through the graphite brushes, ensuring the stability of the reverse conductor 4. In addition, the support structure 5 also maintains good electrical contact with the bottom of the contact cup 2 through the brushes.

[0043] Example 2 This embodiment provides a vacuum circuit breaker, which uses the vacuum circuit breaker contact with a built-in reverse conductor provided in Example 1.

[0044] The working principle of the vacuum circuit breaker of this embodiment is as follows: When the vacuum circuit breaker first opens, the moving and static contacts have just separated, and the breaking current is close to the peak current. At this time, the current flow path in the moving contact (i.e., the vacuum circuit breaker contact with a built-in reverse conductor) is through the contact piece 1 to the contact cup 2 and then into the conductive rod 3. When flowing through the spiral structure of the contact cup 2, it will form an eddy current with a clockwise direction. This current will generate a longitudinal magnetic field between the poles, pointing from the anode to the cathode. This longitudinal magnetic field can optimize the magnetic field distribution and achieve effective control of the arc.

[0045] The support structure 5 initially contacts the counter conductor 4. To enable it to exert an upward force on the counter conductor 4, it is inserted into the through-hole 5031 at the bottom of the contact cup 2. Initially, the current flows through the contact cup 2 and then to the conductive rod 3. Therefore, the support structure 5 must initially extend into the through-hole 5031 to maintain the integrity of the conductive path. As the vacuum circuit breaker mechanism operates, the moving contact (i.e., the vacuum circuit breaker contact with the internal counter conductor) moves. Because the support structure 5 remains relatively stationary, it exerts an upward supporting force on the counter conductor 4 as the moving contact continues its downward movement. Under this supporting force, the internal counter conductor 4 contacts the contact piece 1 and lifts it, freeing it from contact with the contact cup 2. At this point, the current in the moving contact (i.e., the vacuum circuit breaker contact with the internal counter conductor) flows through the contact piece 1, to the internal counter conductor 4, then to the support structure 5, and finally into the conductive rod 3. When current flows through the internal reverse conductor 4, an eddy current with a counterclockwise direction is formed, generating a longitudinal magnetic field from the cathode to the anode between the poles. This longitudinal magnetic field can effectively offset the residual magnetic field existing between the poles at this time. The vacuum circuit breaker significantly reduces the residual magnetic field between the poles when the current is close to zero crossing.

[0046] The present invention provides a vacuum circuit breaker contact with a built-in reverse conductor. The contact comprises a contact piece 1, a contact cup 2, a conductive rod 3, a reverse conductor 4, and a support structure 5. The contact piece 1 is connected to the top of the contact cup 2, the conductive rod 3 is connected to the bottom of the contact cup 2, and the reverse conductor 4 is disposed within the contact cup 2. The support structure 5 is connected to the circuit breaker housing via an insulating rod to ensure its relative fixed position. The support structure 5 is movably connected to the reverse conductor 4 and maintains a constant electrical connection. The bottom of the contact cup 2 is provided with a through slot 202 for the support structure 5 to be inserted into. The contact cup 2 corresponds to the support structure 5 passing through the through slot 202. The sidewall of the contact cup 2 is provided with a plurality of first spiral grooves 201, and the sidewall of the reverse conductor 4 is provided with a plurality of second spiral grooves 401. The second spiral grooves 401 have a rotation direction opposite to that of the first spiral grooves 201. An insulating sliding connector 6 is provided between the contact cup 2 and the contact piece 1. The insulating sliding connector 6 is configured as an insulating sliding rod 7. The support structure 5 includes a sleeve 501 that is sleeved around the outside of the conductive rod 3. The top of the sleeve 501 is provided with a support rod 502 that is inserted into the through slot 202 and corresponds to the bottom surface of the contact cup 2. The bottom of the sleeve 501 is provided with a base plate 503, which is provided with a through hole 5031 for the conductive rod 3 to pass through. The through hole 5031 is provided with a brush that contacts the conductive rod 3. The brush is configured as a graphite brush. The contact piece 1 is provided with a strip hole 101 extending from the edge toward the center. The outer end of the strip hole 101 corresponds to the top of the first spiral groove 201. The first spiral groove 201, the second spiral groove 401, and the strip holes 101 are the same number and are evenly distributed around the center. The strip holes 101 are configured as straight strip holes 101. The material of the reverse conductor 4 is configured as a copper-chromium alloy.

[0047] The present invention also provides a vacuum circuit breaker, which adopts a vacuum circuit breaker contact with a built-in reverse conductor.

[0048] Therefore, the vacuum circuit breaker contact with built-in reverse conductor and the vacuum circuit breaker of the present invention can solve the problem in the prior art that the inter-pole residual magnetism affects the breaking effect of the DC vacuum circuit breaker during breaking, thereby improving the breaking performance and reliability of the DC vacuum circuit breaker.

[0049] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A vacuum circuit breaker contact with a built-in reverse conductor, characterized in that: It comprises a contact piece (1), a contact cup (2), a conductive rod (3), a reverse conductor (4) and a supporting structure (5), The contact piece (1) is connected to the top of the contact cup (2), the conductive rod (3) is connected to the bottom of the contact cup (2), the reverse conductor (4) is arranged inside the contact cup (2), the support structure (5) is connected to the circuit breaker housing through an insulating rod to ensure that its position is relatively fixed, the support structure (5) is movably connected to the reverse conductor (4) and always maintains electrical connection, the bottom of the contact cup (2) is provided with a through slot (202) for inserting the support structure (5), the contact cup (2) corresponds to the support structure (5) passing through the through slot (202), The side wall of the contact cup (2) is provided with a plurality of first spiral grooves (201), and the side wall of the reverse conductor (4) is provided with a plurality of second spiral grooves (401), wherein the rotation direction of the second spiral grooves (401) is opposite to that of the first spiral grooves (201).

2. The vacuum circuit breaker contact with a built-in reverse conductor according to claim 1, characterized in that: An insulating sliding connection piece (6) is provided between the contact cup (2) and the contact piece (1).

3. The vacuum circuit breaker contact with a built-in reverse conductor according to claim 2, characterized in that: The insulating sliding connection (6) is configured as an insulating sliding rod (7).

4. The vacuum circuit breaker contact with a built-in reverse conductor according to claim 1, characterized in that: The support structure (5) comprises a sleeve (501) sleeved on the outside of the conductive rod (3); a support rod (502) inserted into the through slot (202) and corresponding to the bottom surface of the contact cup (2) is provided at the top of the sleeve (501); a bottom plate (503) is provided at the bottom of the sleeve (501); and a through hole (5031) is provided on the bottom plate (503) for the conductive rod (3) to pass through.

5. The vacuum circuit breaker contact with a built-in reverse conductor according to claim 4, characterized in that: The through hole (5031) is provided with a brush in contact with the conductive rod (3), and the through slot (202) is provided with a brush in contact with the support structure (5).

6. The vacuum circuit breaker contact with a built-in reverse conductor according to claim 5, characterized in that: The brush is configured as a graphite brush.

7. The vacuum circuit breaker contact with a built-in reverse conductor according to claim 1, characterized in that: The contact piece (1) is provided with a strip-shaped hole (101) extending from the edge toward the center, and the outer end of the strip-shaped hole (101) corresponds to the top end of the first spiral groove (201).

8. The vacuum circuit breaker contact with a built-in reverse conductor according to claim 7, characterized in that: The first spiral groove (201), the second spiral groove (401), and the strip-shaped holes (101) are of the same number and are evenly distributed around the center, and the strip-shaped holes (101) are configured as straight strip-shaped holes (101).

9. The vacuum circuit breaker contact with a built-in reverse conductor according to claim 1, characterized in that: The material configuration of the reverse conductor (4) is copper-chromium alloy.

10. A vacuum circuit breaker, characterized in that: A vacuum circuit breaker contact with a built-in reverse conductor as claimed in claim 1 is used.

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