An arc quenching system for a circuit breaker

Abstract

This invention provides an arc-extinguishing system for a circuit breaker, comprising a stationary contact, a moving contact, an arc-extinguishing chamber, a first permanent magnet group, and a second permanent magnet group. Two groups of first permanent magnets are symmetrically distributed along the X-axis on both sides of the stationary contact near where the arc originates, and two groups of second permanent magnets are symmetrically distributed along the X-axis on both sides of the moving contact where the arc originates, and are approximately flush with the moving contact in the Y-axis direction. Each group of first permanent magnets extends along the Y-axis with its N pole facing down and its S pole facing up; correspondingly, the N poles of the second permanent magnet groups are opposite each other. Alternatively, the first permanent magnet groups are arranged along the Y-axis with their S poles facing down and their N poles facing up, and correspondingly, the S poles of the two groups of second permanent magnets are opposite each other. By using a first permanent magnet group that blows the arc laterally along the X-axis and a second permanent magnet group that blows the arc towards the arc-extinguishing chamber along the Z-axis, the arc path is bent, effectively lengthening the arc path and achieving rapid arc extinguishing.

Description

Technical Field

[0001] This invention relates to the field of low-voltage electrical appliances, and more specifically to an arc-extinguishing system for a circuit breaker. Background Technology

[0002] In recent years, with the rapid development of new energy sources, DC power systems have also made significant progress, and voltage levels have been continuously improved, placing higher demands on DC circuit breakers. However, because DC systems, compared to AC systems, do not have a natural zero-crossing arc that is well guided into the arc-extinguishing chamber, the arcing time is longer. In severe cases, the arc cannot be extinguished, leading to serious erosion of the circuit breaker's arc-extinguishing chamber and contact system, affecting the circuit breaker's service life, and even burning out the entire circuit breaker.

[0003] In existing known technologies, arc extinguishing methods generally involve increasing the arc gap to lengthen the arc, using the arc to burn gas-generating materials to promote and cool the arc, or increasing the magnetic field to promote the arc. However, under the constraints of DC high voltage and the limited size of circuit breaker products, these methods are difficult to reliably disconnect circuits.

[0004] To address the above issues, Chinese Patent CN217158090U discloses a stationary contact device for a DC circuit breaker with non-polar magnetic blowout. This device includes a stationary contact, an insulating base, an arc contact, a coil, an arc-initiating plate, a rear base plate, and a coil cover. One end of the stationary contact is connected to the insulating base, and the other end is connected to the rear base plate. The arc contact is located on the other side of the insulating base and connected to it. One end of the arc-initiating plate is connected to the arc contact, and the other end is connected to the rear base plate. One end of the coil is connected to the arc contact, and the other end is connected to the stationary contact. When the moving contact opens to interrupt a small current, current I enters the stationary contact from the top, then flows through the coil to the arc contact, and reaches the moving contact through the arc between the arc contact and the moving contact. When current I flows through the coil, it generates an inward magnetic field B. The arc receives an upward vertical force F within the magnetic field, and under the action of force F, the arc quickly enters the upper arc-extinguishing chamber region to extinguish. When the current I is reversed, the current flowing through the coil is reversed, generating an outward magnetic field B. The magnetic force F acting on the arc is still vertically upward. Under the action of the force F, the arc quickly enters the upper arc-extinguishing chamber area to extinguish, and is not affected by the direction of the current.

[0005] Currently, in actual operation, the above-mentioned patent still has certain shortcomings. The existing technology uses the magnetic field generated by the arc flowing through the coil to push the arc into the arc-extinguishing chamber. The drawbacks of the existing technology are: 1) Due to the relatively large resistance of the coil, the arc cannot be reliably guaranteed to flow from the stationary contact to the coil and then to the arc contact. It is possible that the arc will start directly from the main contact. Similarly, when the arc flows from the moving contact to the stationary contact, the arc is not easy to transfer to the stationary contact through the arc contact, and there is a greater risk of the arc starting from the main contact; 2) When the arc is large, the coil is easily burned out. Summary of the Invention

[0006] Based on the above background, the present invention provides an arc extinguishing system for circuit breakers, which can effectively solve the problem of long arcing time when interrupting DC high voltage and low current, ensure reliable interruption under both forward and reverse current conditions, and improve the breaking capacity of circuit breakers.

[0007] This application discloses an arc-extinguishing system for a circuit breaker, comprising a stationary contact, a moving contact, an arc-extinguishing chamber, a first permanent magnet group, and a second permanent magnet group. The stationary contact includes an arc-initiating stationary contact point and an arc-starting plate. The moving contact includes an arc-initiating moving contact point that cooperates with the arc-initiating stationary contact point. When the arc-initiating moving contact point opens, it forms a general motion trajectory along the Z-axis. The arc-extinguishing chamber includes multiple arc-extinguishing grid plates stacked along the Z-axis, arc-blocking walls located on both sides of the arc-extinguishing grid plates along the X-axis, and a first gas-generating element and a second gas-generating element. In the Y-axis direction, the entire arc-extinguishing chamber is positioned above the stationary contact. Two groups of the first permanent magnets... Two sets of second permanent magnets are symmetrically distributed along the X-axis on both sides of the stationary contact near the arc initiation point. The magnetic field lines generated by the first permanent magnet set are approximately perpendicular to the movement trajectory of the moving contact when the arc initiation point is opened. Two sets of second permanent magnets are symmetrically distributed along the X-axis on both sides of the moving contact, and are approximately flush with the moving contact in the Y-axis direction. Each set of first permanent magnets extends along the Y-axis with the N pole facing down and the S pole facing up. Correspondingly, the N poles of the second permanent magnets are opposite each other. Alternatively, the first permanent magnets are arranged along the Y-axis with the S pole facing down and the N pole facing up. Correspondingly, the S poles of the two sets of second permanent magnets are opposite each other.

[0008] In this way, during use, the arc extinguishing system blows the arc to one side along the X-axis using the first permanent magnet group, and then the second permanent magnet group blows the arc to one side along the Z-axis, causing the arc to bend and lengthen before entering the arc extinguishing chamber, thereby accelerating the arc extinguishing speed.

[0009] In some embodiments, the first gas generating component and the second gas generating component are made of insulating material, and the first gas generating component and the second gas generating component are respectively provided with a first groove for mounting the first permanent magnet assembly and a second groove for mounting the second permanent magnet assembly.

[0010] In the above embodiments, by inserting the magnet into an insulating gas-generating component made of gas-generating material, the impact of the high temperature generated by the electric arc on the permanent magnet can be effectively reduced, preventing the permanent magnet from reaching the Curie temperature and demagnetizing.

[0011] In some embodiments, the arc extinguishing system further includes a magnetic guide plate disposed at the bottom of the second groove, the second permanent magnet assembly being magnetically attracted to the magnetic guide plate, and the magnetic guide plate being made of a ferromagnetic material.

[0012] In the above embodiments, the magnetic field strength can be increased by setting a magnetic plate, which accelerates the electric arc into the arc-extinguishing chamber.

[0013] In some embodiments, the coverage area of ​​the magnetic plate along the Z-axis exceeds the limit position to which the moving contact of the arc-initiating point is opened, or the coverage area of ​​the magnetic plate along the Z-axis is flush with the limit position to which the moving contact of the arc-initiating point is opened.

[0014] In the above embodiment, by covering the opening path of the moving contact with a large area by the magnetic plate, the range of the magnetic field is expanded, making the magnetic field more conducive to blowing the arc towards the arc extinguishing chamber.

[0015] In some embodiments, the first gas generating component and the second gas generating component are provided with insulating covers for encapsulating the first permanent magnet assembly and the second permanent magnet assembly.

[0016] In the above embodiments, by providing an insulating cover to encapsulate the permanent magnet, the impact of the high temperature of the electric arc on the magnet can be further reduced, ensuring that the magnetic field is not weakened.

[0017] In some embodiments, the first permanent magnet group on each side of the arc-initiating stationary contact is a single permanent magnet or a stack of multiple permanent magnets.

[0018] In the above embodiments, the magnetic field strength can be adjusted by changing the number of magnets to achieve the most favorable arc extinguishing effect.

[0019] In some embodiments, the first permanent magnet group includes at least two permanent magnets and a ferromagnet disposed between any two permanent magnets, the ferromagnet being attracted to the permanent magnets at its two ends.

[0020] In the above embodiments, by placing a ferromagnet between two permanent magnets, the amount of magnets used can be reduced, while still achieving the effect of a favorable magnetic field line cutting the electric arc.

[0021] In some embodiments, the second permanent magnet group on each side of the arc-initiating moving contact includes at least one permanent magnet.

[0022] In the above embodiments, the magnetic field strength can be adjusted by adjusting the number of permanent magnets, and the number of permanent magnets can be adjusted according to the actual situation.

[0023] In some embodiments, the first permanent magnet group and the second permanent magnet group are cylindrical or elongated.

[0024] In the above embodiments, the shape of the permanent magnet assembly is not limited; cylindrical or elongated shapes can both achieve the effect of blowing an electric arc.

[0025] In some embodiments, the stationary contact is provided with an air-generating pad, the air-generating pad is made of insulating material, the air-generating pad has protrusions on both sides of the stationary contact where the arc is initiated, and the first air-generating component and the second air-generating component are provided with recesses that cooperate with the protrusions.

[0026] In the above embodiments, by adding a gas-generating pad with gas-generating properties to the stationary contact, the arc can be facilitated to move above the stationary contact where the arc is ignited by the air blowing action. The protrusions on the gas-generating pad and the recesses on the first and second gas-generating components form a concave-convex fit, which can effectively prevent the arc from deviating too much to one side of the arc-extinguishing chamber and effectively and quickly guide the arc into the arc-extinguishing chamber.

[0027] The beneficial effects of this invention are as follows:

[0028] 1. This invention achieves rapid arc extinguishing by setting up a first permanent magnet group that blows the arc laterally along the X-axis and a second permanent magnet group that blows the arc toward the arc extinguishing chamber along the Z-axis, thereby bending the arc path and effectively lengthening the arc path.

[0029] 2. The arc extinguishing system of the present invention can quickly extinguish the arc, effectively solving the problem that the arc burning time is too long and easily burns the stationary and moving contacts when interrupting DC high voltage and low current, thus extending the service life of the circuit breaker.

[0030] 3. The arc extinguishing system of the present invention can simultaneously ensure reliable interruption of the circuit breaker when it is subjected to forward or reverse current, thereby improving the breaking capacity. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0032] Figure 1 This is a perspective view of the arc extinguishing system of the present invention;

[0033] Figure 2 A perspective view of the arc-extinguishing system concealing the arc-extinguishing chamber of the present invention;

[0034] Figure 3 for Figure 2 Cross-sectional view along the XY plane;

[0035] Figure 4 for Figure 1 A three-dimensional view of the central arc-extinguishing chamber;

[0036] Figure 5 for Figure 13D view of the intermediate static contact;

[0037] Figure 6 for Figure 1 A three-dimensional view of the moving contact;

[0038] Figure 7 for Figure 2 Side view;

[0039] Figure 8 for Figure 1 Cross-sectional view along the YZ plane;

[0040] Figure 9 and Figure 10 for Figure 1 Cross-sectional view along the XZ plane;

[0041] Figure 11 This is a schematic diagram of the structure of the first gas-generating component;

[0042] Figure 12 This is a schematic diagram of the assembly of the first and second permanent magnet groups in the arc extinguishing system.

[0043] Figure 13 for Figure 12 Sectional view along line AA;

[0044] Figure 14 This is a schematic diagram showing the cooperation relationship between the second permanent magnet assembly, the first gas generating component, the second gas generating component, and the magnetic guide plate in other embodiments;

[0045] Figure 15 , Figure 16 , Figure 17 This is a schematic diagram of the magnetic field distribution of the first permanent magnet assembly on both sides of the stationary contact.

[0046] Figure 18 and Figure 19 This is a schematic diagram of the magnetic field distribution on both sides of the movement trajectory of the second permanent magnet assembly;

[0047] Figure 20 This is a schematic diagram of the trajectory of an electric arc from the stationary contact where the arc begins to the moving contact where the arc begins.

[0048] Figure 21 This is a schematic diagram of the trajectory of an electric arc from the moving contact where the arc begins to the stationary contact where the arc begins.

[0049] Figure 22 and Figure 23 A schematic diagram of the remaining structure of the stationary contact and the first permanent magnet assembly;

[0050] Figure 24 Other structural diagrams of the arc-extinguishing chamber of the arc-extinguishing system are omitted.

[0051] Figure 25A schematic diagram of a structure for installing an insulating cover on the second gas-generating component of the arc-extinguishing chamber;

[0052] Figure 26 A schematic diagram of a structure for installing an air-generating pad on a stationary contact;

[0053] Figure 27 A schematic diagram of a structure with a recessed portion on the first gas-generating component;

[0054] Figure 28 A schematic diagram showing the interaction between the gas-generating pad on the stationary contact and the first and second gas-generating components. Detailed Implementation

[0055] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of the embodiments of this invention will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of this invention. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this invention, and should not be construed as limiting the invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0056] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. Therefore, they should not be construed as limitations on the present invention. Furthermore, terms such as "first" and "second" are merely used for distinction in description and have no special meaning.

[0057] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0058] like Figure 1 , Figure 2 and Figure 3 As shown, this invention discloses an arc-extinguishing system 100 for a circuit breaker, comprising a stationary contact 10, a moving contact 20, an arc-extinguishing chamber 30, a first permanent magnet group 40, and a second permanent magnet group 41, as follows. Figure 1 As shown, the X-axis, Y-axis, and Z-axis are aligned with the width, height, and length of the arc-extinguishing chamber 30.

[0059] Please refer to Figure 4The arc-extinguishing chamber 30 includes multiple arc-extinguishing grid plates 301 stacked along the Z-axis, arc-blocking walls 304 and 305 located on both sides of the arc-extinguishing grid plates 301 along the X-axis, a first gas-generating component 302, and a second gas-generating component 303. The first gas-generating component 302 is fastened to the arc-blocking wall 304 by screws, and the second gas-generating component 303 is connected to the arc-blocking wall 305 by screws. The first gas-generating component 302 and the second gas-generating component 303 are located between the arc-blocking walls on both sides. The arc-extinguishing grid plate 301 includes a root and two legs extending from the root. One leg extends into the semi-enclosed receiving space formed by the first gas-generating component 302, and the other leg extends into the semi-enclosed receiving space formed by the second gas-generating component 303.

[0060] Please refer to Figure 5 The stationary contact 10 includes a stationary conductor and an arc-initiating stationary contact 101 and a stationary contact arc-initiating plate 102 disposed on the stationary conductor. One end of the stationary contact arc-initiating plate 102 is fixed on the stationary conductor, and the other end is bent upward and extended. A longitudinal through groove is formed on the stationary contact arc-initiating plate 102.

[0061] Please refer to Figure 6 and Figure 7 The moving contact 20 includes a contact support and a moving contact piece disposed on the contact support. The moving contact piece is provided with an arc-initiating moving contact 201. The arc-initiating moving contact 201 cooperates with the arc-initiating stationary contact 101. When the arc-initiating moving contact opens, it forms a movement trajectory with the overall direction along the Z-axis.

[0062] Please refer to Figure 8 In the Y-axis direction, the arc-extinguishing chamber 30 is located above the stationary contact 10, and the arc-extinguishing grid 301 is located above the stationary contact 10 and the moving contact 20, so that the electric arc generated during the opening of the moving contact and the stationary contact moves towards the arc-extinguishing chamber under the action of magnetic blowing.

[0063] Please continue to refer to this. Figure 2 , Figure 3 , Figure 9 and Figure 10Two sets of first permanent magnet groups 40 are symmetrically distributed on both sides of the arc-initiating stationary contact 101 along the X-axis, and two sets of second permanent magnet groups 41 are symmetrically distributed on both sides of the arc-initiating moving contact 201 along the X-axis, and are approximately flush with the arc-initiating moving contact 201 in the Y-axis direction. Each set of first permanent magnet groups 40 extends along the Y-axis with the N pole facing down and the S pole facing up; correspondingly, the N poles of the second permanent magnet groups 41 are opposite each other. Alternatively, in other embodiments, the first permanent magnet groups 40 arranged along the Y-axis can be configured with the S pole facing down and the N pole facing up, with the S poles of the two sets of second permanent magnet groups 41 correspondingly opposite each other. The shapes of the first permanent magnet group 40 and the second permanent magnet group 41 are cylindrical or elongated.

[0064] Please refer to Figure 11 , Figure 12 and Figure 13 The first gas generating component 302 is provided with a first groove 302a and a second groove 302b. The second gas generating component 303 has the same structure as the first gas generating component 302, and is also provided with a first groove and a second groove. The first permanent magnet group 40 on one side of the arc-initiating stationary contact 101 is installed in the first groove 302a of the first gas generating component 302, and the second permanent magnet group 41 on one side of the arc-initiating moving contact is installed in the second groove of the first gas generating component 302. The first permanent magnet group 40 on the other side is installed in the first groove of the second gas generating component 303, and the second permanent magnet group 41 on the other side is installed in the second groove of the second gas generating component 303.

[0065] Please refer to Figure 14 In a preferred embodiment, the arc-extinguishing system further includes two magnetic plates 411, which are respectively disposed at the bottom of the second groove 302b. The second permanent magnet assembly 41 is magnetically attracted to the magnetic plates 411 and located on the opening side of the second groove 302b. The magnetic plates are made of ferromagnetic material, which can enhance the magnetic field. The length of the magnetic plate 411 along the Z-axis is greater than or equal to the travel length of the moving contact for arc initiation. The projection of the arc-initiating moving contact's travel along the X-axis is located within the projection range of the magnetic plate 411 along the X-axis, and the projection lengths of the two are the same and completely coincident, or the projection length of the magnetic plate 411 exceeds the projection length of the arc-initiating moving contact's travel, that is, the coverage area of ​​the magnetic plate 411 along the Z-axis exceeds the limit position to which the arc-initiating moving contact 201 is opened, or the coverage area of ​​the magnetic plate 411 along the Z-axis is flush with the limit position to which the arc-initiating moving contact 201 is opened.

[0066] Please refer to Figure 15 , Figure 16 and Figure 17The first permanent magnet group 40 is located on both sides of the stationary contact 101 where the arc is initiated, with the N pole facing down and the S pole facing up. The magnetic field lines run from bottom to top, and the magnetic field formed near the stationary contact 101 where the arc is initiated is upward. When the arc flows from the stationary contact 101 to the moving contact 201 where the arc is initiated, the arc is subjected to the magnetic force of the first permanent magnet group 40 on the left. According to the left-hand Ampere's rule, the arc will deflect to the left. When the arc flows from the moving contact 201 to the stationary contact 101 where the arc is initiated, the arc is subjected to the magnetic force of the first permanent magnet group 40 on the right. According to the left-hand rule, the arc will deflect to the right.

[0067] Please refer to Figure 18 and Figure 19 Two sets of the second permanent magnets 41 are symmetrically distributed on both sides of the arc-initiating moving contact 201 with the N poles facing each other. According to the left-hand Ampere's law, the arc moving to the left side generates a magnetic force perpendicular to the magnetic field upward under the magnetic field of the second permanent magnets 41 on the left side, and the arc moves upward and quickly enters the arc-extinguishing chamber; the arc moving to the right side generates a magnetic force perpendicular to the magnetic field upward under the magnetic field of the second permanent magnets 41 on the right side, and the arc moves upward and quickly enters the arc-extinguishing chamber.

[0068] Please refer to Figure 20 As shown in the diagram, when the arc direction is from the moving contact 201 where the arc originates to the stationary contact 101, the arc first bends to the right from the moving contact 201 and then moves upward, forming a curved trajectory. This lengthens the arc's path, allowing it to be quickly extinguished upon reaching the arc-extinguishing chamber. Please refer to [the diagram]. Figure 21 When the arc direction is from the stationary contact 101 where the arc begins to the moving contact where the arc begins to 201, the arc first moves to the left and bends from the stationary contact 101 where the arc begins, and then moves upward, forming a curved trajectory. This lengthens the arc's path, allowing the arc in the arc-extinguishing chamber to be extinguished quickly.

[0069] In some embodiments, such as Figure 22 As shown, the first permanent magnet group 40 includes two permanent magnets and a ferromagnetic body 401 disposed between the two permanent magnets. The ferromagnetic body 401 is attracted to the permanent magnets at both ends. The two groups of the first permanent magnet groups 40 are symmetrically distributed on both sides of the arc-starting stationary contact 101.

[0070] In some embodiments, such as Figure 23 As shown, the first permanent magnet group 40 is composed of 5 permanent magnets stacked together, and the two groups of the first permanent magnet groups 40 are symmetrically distributed on both sides of the arc-initiating static contact 101.

[0071] In some embodiments, such as Figure 24 As shown, each group of the second permanent magnet group 41 includes two permanent magnets.

[0072] In some embodiments, such as Figure 25 As shown, the first gas generating component 302 and the second gas generating component 303 are provided with insulating covers 412 for encapsulating the first permanent magnet assembly 40 and the second permanent magnet assembly 41. The insulating covers 412 are tightly fitted with the first gas generating component 302 and the second gas generating component 303. The insulating covers have a certain heat insulation function, which can partially isolate the high temperature generated by the electric arc combustion, prevent the permanent magnet temperature from exceeding the internal temperature and demagnetizing, and also play a role in fixing the position of the permanent magnet.

[0073] In some embodiments, such as Figure 26 , Figure 27 and Figure 28 As shown, the stationary contact 10 is provided with a gas-generating pad 50, which is made of insulating material. The gas-generating pad 50 has protrusions 501a and 501b on both sides of the stationary contact 101 where the arc is ignited. The first gas-generating component 302 and the second gas-generating component 303 are provided with recesses 302c and 303c that cooperate with the protrusions 501a and 501b. The total width formed by the protrusions on the left and right sides is greater than the width of the stationary contact arc-initiating plate 302, which can effectively guide the arc through the stationary contact arc-initiating plate and prevent the arc from spreading excessively to both sides of the arc-extinguishing chamber when the arc is ignited, thus facilitating the rapid entry of the arc into the arc-extinguishing chamber.

[0074] The arc extinguishing system of the circuit breaker disclosed in this application, through the reasonable arrangement of the first permanent magnet group and the second permanent magnet group, enables the arc to quickly enter the arc extinguishing chamber and be extinguished when the circuit breaker interrupts the fault current or critical load current, thereby reducing the burn damage of the arc to the moving contact and stationary contact, and at the same time, there is no polarity requirement for the arc movement direction.

[0075] This invention may be implemented in other specific forms without departing from its spirit and essential characteristics. The present embodiments are to be regarded in all respects as exemplary rather than limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and all modifications falling within the meaning of the claims and their equivalents are thus included within the scope of the invention.

Claims

1. An arc extinguishing system (100) for a circuit breaker, characterized in that, It includes a stationary contact (10), a moving contact (20), an arc-extinguishing chamber (30), a first permanent magnet group (40), and a second permanent magnet group (41); The stationary contact (10) includes an arc-initiating stationary contact point (101) and a stationary contact arc-initiating piece (102); The moving contact (20) includes an arc-initiating moving contact (201), which cooperates with the arc-initiating stationary contact (101). When the arc-initiating moving contact (201) is opened, it forms a movement trajectory with the overall direction along the Z-axis. The arc-extinguishing chamber (30) includes multiple arc-extinguishing grid plates (301) stacked along the Z-axis, arc-blocking walls (304, 305) located on both sides of the arc-extinguishing grid plates (301) along the X-axis, and a first gas-generating element (302) and a second gas-generating element (303). In the Y-axis direction, the arc-extinguishing chamber (30) is at least partially located above the stationary contact (10). Two sets of first permanent magnet groups (40) are symmetrically distributed along the X-axis on both sides of the stationary contact (101) that initiates the arc. The magnetic field lines generated by the first permanent magnet groups (40) are approximately perpendicular to the movement trajectory of the moving contact (201) that initiates the arc when it is opened. Two sets of second permanent magnet groups (41) are symmetrically distributed along the X-axis on both sides of the moving contact (201) that initiates the arc, and are approximately flush with the moving contact (201) that initiates the arc in the Y-axis direction. Each set of first permanent magnet groups (40) extends along the Y-axis with the N pole facing down and the S pole facing up. Correspondingly, the N poles of the second permanent magnet groups (41) are arranged opposite each other. Alternatively, the first permanent magnet groups (40) are arranged along the Y-axis with the S pole facing down and the N pole facing up. Correspondingly, the S poles of the two sets of second permanent magnet groups (41) are arranged opposite each other.

2. The arc extinguishing system for a circuit breaker according to claim 1, characterized in that, The first gas generating component (302) and the second gas generating component (303) are made of insulating material. The first gas generating component (302) and the second gas generating component (303) are respectively provided with a first groove (302a) for installing the first permanent magnet assembly (40) and a second groove (302b) for installing the second permanent magnet assembly (41).

3. The arc extinguishing system for a circuit breaker according to claim 1 or 2, characterized in that, It also includes a magnetic guide plate (411), which is disposed at the bottom of the second groove (302b), and the second permanent magnet assembly (41) is magnetically attracted to the magnetic guide plate (411). The magnetic guide plate (411) is made of ferromagnetic material.

4. The arc extinguishing system for a circuit breaker according to claim 3, characterized in that, The coverage area of ​​the magnetic plate (411) along the Z-axis direction exceeds the limit position opened by the arc-initiating moving contact (201), or the coverage area of ​​the magnetic plate (411) along the Z-axis direction is flush with the limit position opened by the arc-initiating moving contact (201).

5. The arc extinguishing system for a circuit breaker according to claim 1 or 2, characterized in that, The first gas generating component (302) and the second gas generating component (303) are provided with insulating covers (412) for encapsulating the first permanent magnet assembly (40) and the second permanent magnet assembly (41).

6. The arc extinguishing system for a circuit breaker according to claim 1, characterized in that, The first permanent magnet group (40) on each side of the arc-initiating static contact (101) is a single permanent magnet or a stack of multiple permanent magnets.

7. The arc extinguishing system for a circuit breaker according to claim 1, characterized in that, The first permanent magnet group (40) includes at least two permanent magnets and a ferromagnet (401) disposed between any two permanent magnets, wherein the ferromagnet (401) is attracted to the permanent magnets at both ends.

8. The arc extinguishing system for a circuit breaker according to claim 1, characterized in that, The second permanent magnet group (41) on each side of the arc-initiating moving contact (201) includes at least one permanent magnet.

9. The arc extinguishing system for a circuit breaker according to claim 1, characterized in that, The first permanent magnet group (40) and the second permanent magnet group (41) are cylindrical or elongated.

10. The arc extinguishing system for a circuit breaker according to claim 1, characterized in that, The stationary contact (10) is provided with an air-generating pad (50), which is made of insulating material. The air-generating pad (50) has protrusions (501a, 501b) on both sides of the arc-starting stationary contact (101). The first air-generating component (302) and the second air-generating component (303) are provided with recesses that cooperate with the protrusions (501a, 501b).

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