Mutual inductor and circuit breaker

Abstract

The utility model relates to a mutual inductor and a circuit breaker, and relates to the technical field of high-low voltage electric appliances. The mutual inductor comprises a shell, a detection assembly and an insulation support. The detection assembly comprises a rapid saturation coil and a hollow coil, and the rapid saturation coil and the hollow coil are arranged in the shell. The insulation support is connected to the shell, the insulation support is arranged between the rapid saturation coil and the hollow coil, and the insulation support can insulate and isolate the rapid saturation coil and the hollow coil so as to increase the creepage distance between the rapid saturation coil and the hollow coil. The mutual inductor can solve the problems that the mutual inductor cannot meet the requirements of electrical clearance and creepage distance in a high-voltage environment, and assembly and connection among all parts in the mutual inductor are not stable.

Description

Technical Field

[0001] This application relates to the technical field of high and low voltage electrical appliances, and specifically, to a mutual inductor and a circuit breaker. Background Art

[0002] When a circuit breaker is in use, it usually needs to install a mutual inductor in the circuit to monitor the magnetic field of the conductor in the circuit, so as to realize the real-time monitoring of the working state of the conductor in the circuit.

[0003] In the prior art, a mutual inductor usually includes structures such as an air core coil and a quick saturation coil for inducing electricity during monitoring. At the same time, a housing is arranged outside the air core coil and the quick saturation coil. On the one hand, it can protect and fix the above components, and on the other hand, it can also insulate and isolate the above components from the conductor in the circuit.

[0004] However, when the above structure is applied to a high-voltage environment, the electrical clearance and creepage distance usually cannot meet the requirements. When a transient overvoltage occurs in the conductor in the circuit, dielectric breakdown is likely to occur between the conductor and the mutual inductor, and contact short circuits are also likely to occur between components such as the quick saturation coil and the air core coil inside the mutual inductor. At the same time, the air core coil and the quick saturation coil in the housing are usually fixed by dispensing during assembly, and the above fixing method has a risk of instability in a high-voltage environment. Summary of the Utility Model

[0005] The purpose of this application is to provide a mutual inductor and a circuit breaker, and this mutual inductor can solve the problems that the mutual inductor cannot meet the requirements of electrical clearance and creepage distance in a high-voltage environment and the assembly connection between internal components is unstable.

[0006] To achieve the above purpose, according to the first aspect of this application, an embodiment of this application provides a mutual inductor, which includes a housing, a detection component, and an insulating bracket. The detection component includes a quick saturation coil and an air core coil, and both the quick saturation coil and the air core coil are arranged in the housing. The insulating bracket is connected to the housing, and the insulating bracket is arranged between the quick saturation coil and the air core coil. The insulating bracket can insulate and isolate the quick saturation coil and the air core coil to increase the creepage distance between the quick saturation coil and the air core coil.

[0007] Based on the above embodiments of the present application, by providing an insulating bracket between the fast saturation coil and the air core coil, on the one hand, the insulating bracket separates the two to strengthen the insulation isolation between them and enhance the solid insulation between them. At the same time, when the insulating bracket is arranged between the two, it is fixed to the two in an appropriate manner, so that the relative positions of the two can be fixed, making the assembly of the fast saturation coil and the air core coil in the housing more stable. Further, the provision of the insulating bracket can also extend the creepage distance between the fast saturation coil and the air core coil and other conductors outside the housing, enabling the two to meet the creepage distance and electrical clearance requirements in a high-voltage environment and enhancing the insulation protection effect.

[0008] In some embodiments, the insulating bracket includes an insulating body, a first connecting portion, a second connecting portion, and a third connecting portion. The first connecting portion is arranged on the first side of the insulating body, and the first connecting portion is connected to the fast saturation coil. The second connecting portion is arranged on the second side of the insulating body opposite to the first side, and the second connecting portion is connected to the air core coil. The third connecting portion is arranged on at least one of the insulating body, the first connecting portion, or the second connecting portion, and the third connecting portion is directly or indirectly connected to the housing.

[0009] Based on the above embodiments of the present application, the connection between the insulating bracket and the fast saturation coil and the air core coil is realized through the first connecting portion and the second connecting portion respectively, so that the relative positions between the fast saturation coil and the air core coil are fixed, improving the fixing effect between the two compared with the existing glue-point fixing method and making the monitoring results of the current transformer more accurate. Subsequently, the insulating bracket as a whole is directly or indirectly connected to the housing through the third connecting portion to fix the position of the insulating bracket.

[0010] In some embodiments, a first receiving cavity is provided on the first connecting portion to at least partially receive the fast saturation coil. A second receiving cavity is provided on the second connecting portion to at least partially receive the air core coil.

[0011] Based on the above embodiments of the present application, by providing the first receiving cavity and the second receiving cavity, when the insulating bracket is assembled, the fast saturation coil is partially received in the first receiving cavity to realize the position limitation with the insulating bracket, and the air core coil is partially received in the second receiving cavity to realize the position limitation with the insulating bracket. Furthermore, the connection and position fixing between the two and the insulating bracket can be conveniently realized, and the relative positions of the two are fixed.

[0012] In some embodiments, a fourth connecting portion is provided on the housing. One of the third connecting portion and the fourth connecting portion is provided as a buckle, and the other of the third connecting portion and the fourth connecting portion is provided as a slot, and the buckle can be snapped into the slot.

[0013] Based on the above-mentioned embodiments of the present application, the third connecting part and the fourth connecting part cooperate to realize the connection between the insulating bracket and the shell in the form of a slot and a snap-on connection, which makes the connection process more convenient and also facilitates subsequent disassembly and maintenance.

[0014] In some embodiments, the first connection portion has a U-shaped profile to match the shape of the fast saturation coil, and the second connection portion has an arc-shaped profile to match the shape of the hollow coil.

[0015] Based on the above-mentioned embodiments of the present application, by respectively limiting the contour structures of the first connecting part and the second connecting part, the structures of the two are respectively adapted to the structures of the fast-saturation coil and the hollow coil, thereby further improving the insulation isolation effect and assembly fixing effect of the insulating bracket for the fast-saturation coil and the hollow coil.

[0016] In some embodiments, a detection hole is provided in the mutual inductor, the detection hole passes through the shell, and a conductor is passed through the detection hole. A positioning column is provided in the shell, the positioning column is provided on the inner wall of the shell, the hollow coil abuts against the positioning column, and the positioning column and the second connecting part are respectively provided on both sides of the detection hole to cooperate with each other to limit the hollow coil.

[0017] Based on the above-mentioned embodiments of the present application, since the conductor needs to be inserted into the detection hole when the mutual inductor is in use, the hollow coil is arranged around the outside of the detection hole to realize induction detection. Through the cooperation of the positioning column and the second connecting part, the two are respectively arranged on both sides of the detection hole, so that the positioning column and the second connecting part can cooperate with each other from both sides to support and limit the hollow coil.

[0018] In some embodiments, a fixing plate is disposed in the housing, and the fourth connecting portion is disposed on the fixing plate. The fixing plate is fixedly connected to the positioning column.

[0019] Based on the above-mentioned embodiments of the present application, by setting a fixing plate, the position of the fixing plate can be set according to the shape of the insulating bracket, so that it is more convenient to connect the insulating bracket to the shell. At the same time, the fixing plate is connected to the positioning column, and the two support each other, so that the strength of both can be improved, that is, the fixing effect of the insulating bracket and the limiting effect of the hollow coil are improved.

[0020] In some embodiments, the housing includes a first housing and a second housing, the first housing and the second housing are buckled to form a receiving cavity, the detection assembly and the insulating bracket are both arranged in the receiving cavity. The detection hole runs through the first housing and the second housing, and an isolation cylinder is arranged between the detection hole and the receiving cavity to insulate and isolate the detection hole from the receiving cavity.

[0021] Based on the above embodiments of the present application, the fast saturation coil, the air-core coil, and the insulating bracket are all arranged in the accommodating cavity. The setting of the isolation cylinder can insulate and isolate between the conductor and various components such as the detection component in the housing.

[0022] In some embodiments, a fastening member is further provided at the joint of the first housing and the second housing to fix the first housing and the second housing.

[0023] Based on the above embodiments of the present application, the first housing and the second housing are connected and fixed by the fastening member.

[0024] According to the second aspect of the present application, a circuit breaker is provided, which includes: a busbar module, a contact module, and the above-mentioned current transformer. The busbar module includes a static busbar and a moving busbar. The contact module includes a moving contact and a static contact. The static busbar is connected to the static contact, and the moving busbar is connected to the moving contact. The current transformer is sleeved on the moving busbar.

[0025] Based on the above embodiments of the present application, by setting the static contact and the moving contact, the on-off of the circuit is realized through the closing and opening of the static contact and the moving contact. And through the setting of the above current transformer, by sleeving the current transformer on the moving busbar, the real-time monitoring of the circuit is realized, and the automatic and precise control is realized.

[0026] Other features and advantages of the present application will be described in detail in the subsequent specific implementation part. Brief Description of the Drawings

[0027] The drawings are used to provide a further understanding of the present application, and constitute a part of the specification. Together with the following specific implementation, they are used to explain the present application, but do not constitute a limitation to the present application. In the drawings:

[0028] Figure 1 is a schematic structural diagram of the current transformer provided by the embodiment of the present application.

[0029] Figure 2 is an exploded view of the current transformer provided by the embodiment of the present application.

[0030] Figure 3 is a schematic structural diagram of the insulating bracket and the second housing in the current transformer provided by the embodiment of the present application.

[0031] Figure 4 is another schematic structural diagram of the insulating bracket and the second housing in the current transformer provided by the embodiment of the present application.

[0032] Figure 5 is a schematic structural diagram of the insulating bracket, the detection component, and the second housing in the current transformer provided by the embodiment of the present application.

[0033] Figure 6It is a schematic structural diagram of a circuit breaker provided by an embodiment of the present application.

[0034] Description of reference numerals

[0035] 1. Housing; 11. Fourth connecting part; 12. Positioning column; 13. Fixed plate; 15. Isolation cylinder; 16. First housing; 17. Second housing; 2. Detection assembly; 21. Fast saturation coil; 211. Coil body; 212. Silicon steel sheet; 22. Hollow coil; 3. Insulating bracket; 31. Insulating main body; 32. First connecting part; 321. First accommodating cavity; 33. Second connecting part; 331. Second accommodating cavity; 34. Third connecting part; 4. Detection hole; 5. Buckling part; 6. Busbar module; 61. Moving busbar; 62. Static busbar; 7. Contact module; 71. Moving contact; 72. Static contact. Detailed implementation manners

[0036] In order to make the objectives, technical solutions and advantages of the present application clearer and more understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0037] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Usually, the components of the embodiments of the present application described and illustrated in the accompanying drawings herein can be arranged and designed in various different configurations.

[0038] Therefore, the detailed description of the embodiments of the present application provided in the accompanying drawings below is not intended to limit the scope of the claimed present application, but merely represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the scope of protection of the present application.

[0039] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0040] In the description of the present application, it should be noted that, unless otherwise stated, the orientation or positional relationship indicated by terms such as "inner" and "outer" is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is usually placed during use. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. In addition, terms such as "first" and "second" are only used for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0041] In the description of the present application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set" and "connected" 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 directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0042] When a circuit breaker is in use, it is usually necessary to install an instrument transformer in the circuit to monitor the magnetic field of the conductor in the circuit through the instrument transformer, so as to realize the real-time monitoring of the working state of the conductor in the circuit.

[0043] In the prior art, structures such as air-core coils and fast-saturation coils are usually arranged inside the instrument transformer for inducing electricity during monitoring. At the same time, a housing is arranged outside the air-core coil and the fast-saturation coil. On the one hand, it can protect and fix the above components, and on the other hand, it can also insulate and isolate the above components from the conductor in the circuit.

[0044] However, when the above structure is applied to a high-voltage environment, the electrical clearance and creepage distance usually cannot meet the requirements. When a transient overvoltage occurs in the conductor in the circuit, dielectric breakdown is likely to occur between the conductor and the instrument transformer, and contact short circuits are also likely to occur between components such as the fast-saturation coil and the air-core coil inside the instrument transformer. At the same time, the air-core coil and the fast-saturation coil in the housing are usually fixed by dispensing during assembly, and the above fixing method has the risk of instability in a high-voltage environment.

[0045] To solve the above problems in the prior art, refer to Figure 1 and Figure 2As shown in the figure, according to the first aspect of the embodiments of the present application, a mutual inductor is provided. The mutual inductor includes a housing 1, a detection component 2, and an insulating support 3. The detection component 2 includes a fast saturation coil 21 and an air core coil 22. Both the fast saturation coil 21 and the air core coil 22 are disposed in the housing 1. The insulating support 3 is connected to the housing 1 and is disposed between the fast saturation coil 21 and the air core coil 22. The insulating support 3 can insulate and isolate the fast saturation coil 21 and the air core coil 22 to increase the creepage distance between the fast saturation coil 21 and the air core coil 22.

[0046] Based on the above embodiments of the present application, by providing the insulating support 3 between the fast saturation coil 21 and the air core coil 22, on the one hand, the two are separated by the insulating support 3 to strengthen the insulation isolation between the two and enhance the solid insulation between the two.

[0047] At the same time, when the insulating support 3 is disposed between the fast saturation coil 21 and the air core coil 22, it can be fixed to the two in an appropriate manner, so as to fix the relative positions of the two, making the assembly of the fast saturation coil 21 and the air core coil 22 in the housing 1 more stable. Further, the setting of the insulating support 3 can also extend the creepage distance between the fast saturation coil 21 and the air core coil 22 and other conductors outside the housing 1, so that the two can meet the creepage distance and electrical clearance requirements in a high-voltage environment, improving the insulation protection effect.

[0048] Specifically, when the circuit breaker works for a long time, the temperature of some working devices in the circuit breaker will reach above 110 degrees Celsius. At this time, structures such as the mutual inductor in the circuit breaker will be heated for a long time, which will not only cause the insulation performance of structures such as the housing 1 of the mutual inductor to decline, but also may cause the potting fixing structure between the fast saturation coil 21 and the air core coil 22 to melt due to heat, affecting the stability and firmness of the connection between the fast saturation coil 21 and the air core coil 22. Once the connection stability between the two is affected, when the circuit breaker and the mutual inductor are in the energized state, the electro-dynamic repulsive force generated by the conductive loop of the conductor will cause the position of the fast saturation coil 21 or the air core coil 22 to move, thereby affecting the accuracy and safety of the mutual inductor during use.

[0049] By providing the insulating bracket 3, the connection between the fast saturation coil 21 and the air core coil 22, which was originally fixed by dispensing glue, is changed to their respective connections and fixations with the insulating bracket 3, and the insulating bracket 3 is connected to the housing 1. At this time, the connection between the fast saturation coil 21 and the air core coil 22 is no longer affected by temperature, thereby making the connection between the fast saturation coil 21 and the air core coil 22 more stable. Further, even if the connection between the insulating bracket 3 and the housing 1 becomes detached, the insulating bracket 3 will still be between the fast saturation coil 21 and the air core coil 22. On the one hand, it keeps the fast saturation coil 21 and the air core coil 22 separated, ensures the creepage distance between them, and improves the insulation protection effect between them. On the other hand, it ensures the fixation of their relative positions and avoids the influence of the electro-dynamic repulsive force on their relative positions.

[0050] In the present application, the specific structure of the insulating bracket 3 can be set to any suitable structure.

[0051] Referring to Figure 3 and Figure 4 As shown in, in an exemplary embodiment provided by the present application, the insulating bracket 3 includes an insulating body 31, a first connecting portion 32, a second connecting portion 33, and a third connecting portion 34. The first connecting portion 32 is disposed on a first side of the insulating body 31, and the first connecting portion 32 is connected to the fast saturation coil 21. The second connecting portion 33 is disposed on a second side of the insulating body 31 opposite to the first side, and the second connecting portion 33 is connected to the air core coil 22. The third connecting portion 34 is disposed on at least one of the insulating body 31, the first connecting portion 32, or the second connecting portion 33, and the third connecting portion 34 is directly or indirectly connected to the housing 1.

[0052] Based on the above embodiments of the present application, the connection between the insulating bracket 3 and the fast saturation coil 21 and the air core coil 22 is respectively achieved through the first connecting portion 32 and the second connecting portion 33, so that the relative positions between the fast saturation coil 21 and the air core coil 22 are fixed, improving the fixing effect between them compared with the existing glue dispensing fixing method, and making the monitoring results of the mutual inductor more accurate. Subsequently, the insulating bracket 3 as a whole is directly or indirectly connected to the housing 1 through the third connecting portion 34 to fix the position of the insulating bracket 3.

[0053] Further, referring to Figure 3 As shown in, in some embodiments of the present application, a first receiving cavity 321 may be provided on the first connecting portion 32 to at least partially receive the fast saturation coil 21. A second receiving cavity 331 may be provided on the second connecting portion 33 to at least partially receive the air core coil 22.

[0054] Based on the above embodiments of the present application, by providing the first accommodation cavity 321 and the second accommodation cavity 331, when the insulating bracket 3 is assembled, a part of the speed saturation coil 21 is accommodated in the first accommodation cavity 321 to realize the position limitation with the insulating bracket 3, and a part of the air-core coil 22 is accommodated in the second accommodation cavity 331 to realize the position limitation with the insulating bracket 3, thereby facilitating the connection between the two and the insulating bracket 3.

[0055] In addition, in some embodiments of the present application, the profile of the first connecting portion 32 may be set to a U-shaped structure to match the shape of the speed saturation coil 21. The profile of the second connecting portion 33 may be set to an arc-shaped structure to match the shape of the air-core coil 22.

[0056] Based on the above embodiments of the present application, by respectively defining the profile structures of the first connecting portion 32 and the second connecting portion 33, the structures of the two are respectively adapted to the structures of the speed saturation coil 21 and the air-core coil 22, further improving the insulation isolation effect and the assembly and fixing effect of the insulating bracket 3 on the speed saturation coil 21 and the air-core coil 22.

[0057] Specifically, the speed saturation coil 21 generally includes a coil body 211 and a group of stacked silicon steel sheets 212. The silicon steel sheets 212 are generally arranged to include a U-shaped section and a straight-edge section. When the speed saturation coil 21 is assembled, the coil body 211 is sleeved on the straight-edge section. By setting the first connecting portion 32 to a U-shaped structure, when in use, the first accommodation cavity 321 is buckled on the U-shaped section for connection and fixation, thereby realizing the overall limit fixation of the insulating bracket 3 and the speed saturation coil 21.

[0058] The air-core coil 22 is generally directly set to a ring structure. By setting the second connecting portion 33 to an arc-shaped structure, the limit fixation of the insulating bracket 3 and the air-core coil 22 is realized.

[0059] Furthermore, in some embodiments of the present application, the cross-sections of the first connecting portion 32 and the second connecting portion 33 may be set to U-shaped structures. The setting of the U-shaped structures enables the first connecting portion 32 and the second connecting portion 33 to better accommodate the speed saturation coil 21 and the air-core coil 22. At the same time, the setting of the U-shaped structures also enables the insulating bracket 3 and the housing 1 to better insulate the speed saturation coil 21 and the air-core coil 22 from other structures outside the housing 1 and extend the creepage distance.

[0060] In some other embodiments of the present application, the insulating bracket 3 can also be arranged in a plate-like structure, which is arranged between the fast-saturation coil 21 and the air-core coil 22 to separate the two, extend the creepage distance between the two, and enhance the insulation effect between the two. At the same time, clamping structures or clamping and connecting structures, such as spring clips, can be respectively arranged on both sides of the plate-like structure to clamp and fix the fast-saturation coil 21 and the air-core coil 22.

[0061] Alternatively, in some other embodiments of the present application, structures such as support columns can also be arranged on the insulating bracket 3. Through the cooperation of the support columns with structures such as the housing 1, the connection and limitation between the fast-saturation coil 21 and the air-core coil 22 and the insulating bracket 3 are realized.

[0062] In summary, in the present application, when the insulating bracket 3 meets the requirements of extending the creepage distance between the fast-saturation coil 21 and the air-core coil 22, enhancing the insulation effect between the two, and fixing the relative positions of the two at the same time, the insulating bracket 3 can be arranged in any suitable structure, and can be specifically adaptively arranged according to the structures and assembly positions of the fast-saturation coil 21 and the air-core coil 22. The present application does not make specific limitations on this.

[0063] Refer to Figures 3 to 5 As shown in, in some embodiments of the present application, a fourth connection part 11 can be arranged on the housing 1. One of the third connection part 34 and the fourth connection part 11 is arranged as a buckle, and the other of the third connection part 34 and the fourth connection part 11 is arranged as a slot, and the buckle can be clamped in the slot.

[0064] Based on the above embodiments of the present application, through the cooperation of the third connection part 34 and the fourth connection part 11, the connection between the insulating bracket 3 and the housing 1 is realized in the way of clamping the slot and the buckle, making the connection process more convenient, and also facilitating later disassembly and maintenance.

[0065] Specifically, the third connection part 34 can be arranged only on one of the insulating main body 31, the first connection part 32 or the second connection part 33, or the third connection part 34 can be arranged at multiple positions at the same time, and the fourth connection part 11 is correspondingly arranged on the housing 1, so as to further enhance the connection effect between the insulating bracket 3 and the housing 1.

[0066] Further, refer to Figure 4 and Figure 5 As shown in, in some embodiments of the present application, a fixing plate 13 can also be arranged in the housing 1, and the fourth connection part 11 is arranged on the fixing plate 13.

[0067] Based on the above-mentioned embodiments of the present application, by setting the fixing plate 13, the position of the fixing plate 13 can be set according to the shape of the insulating bracket 3, so that it is more convenient to fix the insulating bracket 3 to the housing 1. For example, when the first connecting portion 32 is set as a U-shaped structure, buckles can be set on the outer walls of the two sides of the U-shaped structure that are close to each other, and a slot is set on the fixing plate 13. After the slot and the buckle are connected, the elasticity of the U-shaped structure itself allows the slot and the buckle to maintain a connected state, thereby reducing the possibility of the two being separated.

[0068] In some other embodiments of the present application, the third connection part 34 and the fourth connection part 11 can also be set to any other suitable structure, for example, the third connection part 34 is set to a bolt, and the fourth connection part 11 is set to a nut, and the connection between the insulating bracket 3 and the housing 1 is achieved by connecting the bolts and nuts. At the same time, in order to ensure the insulation effect, the bolts and nuts can be set to plastic or other materials, and a sealing structure can be set at the contact position with the insulating bracket 3 and other structures when the bolts are passed through, so as to further enhance the insulation protection effect.

[0069] refer to Figure 4 and Figure 5 As shown in , in some embodiments of the present application, a detection hole 4 may be provided on the mutual inductor, the detection hole 4 passes through the housing 1, and a conductor is provided in the detection hole 4. A positioning column 12 is provided in the housing 1, the positioning column 12 is provided on the inner wall of the housing 1, the hollow coil 22 abuts against the positioning column 12, and the positioning column 12 and the second connecting portion 33 are provided on both sides of the detection hole 4 to cooperate with each other to limit the hollow coil 22. And the positioning column 12 is fixedly connected to the fixing plate 13.

[0070] Based on the above-mentioned embodiments of the present application, since the conductor needs to be inserted into the detection hole 4 when the mutual inductor is in use, the hollow coil 22 is arranged around the outside of the detection hole 4 to realize induction detection. The positioning column 12 and the second connecting part 33 cooperate with each other and are respectively arranged on both sides of the detection hole 4, so that the positioning column 12 and the second connecting part 33 can cooperate with each other from both sides to limit and fix the hollow coil 22.

[0071] In addition, by fixedly connecting the positioning column 12 and the fixing plate 13, the two support each other, so that the strength of both can be improved, that is, the fixing effect on the insulating bracket 3 and the limiting effect on the hollow coil 22 are improved at the same time.

[0072] Further, in some embodiments, the housing 1 may include a first housing 16 and a second housing 17. The first housing 16 and the second housing 17 are snap-fitted to form a receiving cavity, and both the detection assembly 2 and the insulating bracket 3 are disposed in the receiving cavity. The detection hole 4 penetrates through the first housing 16 and the second housing 17, and an isolation cylinder 15 is disposed between the detection hole 4 and the receiving cavity to isolate the detection hole 4 from the receiving cavity.

[0073] Based on the above embodiments of the present application, the fast saturation coil 21, the air core coil 22, and the insulating bracket 3 are all disposed in the receiving cavity. The setting of the isolation cylinder 15 can insulate and isolate between the conductor and the components in the housing 1.

[0074] Specifically, after the isolation cylinder 15 is disposed, the air core coil 22 and the fast saturation coil 21 can be sleeved outside the isolation cylinder 15. At this time, when the conductor passes through the detection hole 4, it just passes through the air core coil 22, so that electricity is induced in the air core coil 22. At the same time, by sleeving the air core coil 22 and the fast saturation coil 21 outside the isolation cylinder 15, the positions of the two can be limited to a certain extent.

[0075] Further, in order to improve the insulation protection effect at the joint position of the first housing 16 and the second housing 17, as shown in Figure 2 , in some embodiments of the present application, the isolation cylinder 15 can be set as a first cylinder and a second cylinder. The first cylinder and the second cylinder are respectively connected to the first housing 16 and the second housing 17. When the first housing 16 and the second housing 17 are snap-fitted, the first cylinder and the second cylinder are abutted against each other to form a complete isolation cylinder 15 structure. At the same time, a stepped surface can be provided at the joint position of the first cylinder and the second cylinder. Through the setting of the stepped surface, on the one hand, the connection between the first cylinder and the second cylinder is more stable, and more importantly, the creepage distance of the inside and outside of the isolation cylinder 15 passing through the joint of the first cylinder and the second cylinder can be extended, thereby further improving the insulation protection effect of the housing 1.

[0076] At the same time, in some embodiments of the present application, a snap-fit member 5 can also be provided at the joint of the first housing 16 and the second housing 17. The connection between the first housing 16 and the second housing 17 is realized through the setting of the snap-fit member 5, and at the same time, the fixing between the two by snap-fitting is also convenient for later disassembly and maintenance. Among them, the snap-fit member 5 can be specifically set as a structure such as a snap block and a snap interface.

[0077] In other some embodiments, the first housing 16 and the second housing 17 can also be fixed by means of bolt connection or the like, and the present application does not make specific limitations thereto.

[0078] In addition, a stepped surface can also be provided at the joint position between the first housing 16 and the second housing 17, and the insulating protection effect at the joint position between the first housing 16 and the second housing 17 can be further improved by setting the stepped surface.

[0079] Based on the above technical solution, according to the second aspect of the present application, as shown in Figure 6 a circuit breaker is further provided, which includes a busbar module 6, a contact module 7, and the above-mentioned current transformer. The busbar module 6 includes a static busbar 62 and a moving busbar 61. The contact module 7 includes a moving contact 71 and a static contact 72. The static busbar 62 is connected to the static contact 72, and the moving busbar 61 is connected to the moving contact 71. The current transformer is sleeved on the moving busbar 61.

[0080] Based on the above embodiments of the present application, by providing the static contact 72 and the moving contact 71, the on-off of the circuit is realized by the closing and opening of the static contact 72 and the moving contact 71. And through the setting of the above current transformer, on the one hand, the insulating protection effect of the current transformer and the circuit breaker is improved, and on the other hand, the structures of the quick saturation coil 21 and the air core coil 22 in the current transformer are more stable, so that it can be applicable to the high temperature and high voltage environment generated during the long-term use of the circuit breaker, improving the accuracy of monitoring the circuit working state of the conductor, and thus improving the accuracy and safety of the circuit breaker during operation.

[0081] In addition, it should be noted that the circuit breaker in the present application is not limited to the above structure, and specifically, a suitable setting can be selected according to factors such as the actual control requirements of the circuit breaker. The present application does not make specific limitations on this.

[0082] The preferred embodiments of the present application have been described in detail above with reference to the accompanying drawings. However, the present application is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present application, various simple modifications can be made to the technical solution of the present application, and these simple modifications all belong to the protection scope of the present application.

[0083] In addition, it should be noted that, among the various specific technical features described in the above specific embodiments, they can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present application does not further describe various possible combination methods.

[0084] In addition, any combination can be made between various different embodiments of the present application, as long as it does not violate the idea of the present application, it should also be regarded as the content disclosed by the present application.

Claims

1. A mutual inductor, characterized in that: The mutual inductor comprises: case; A detection component, comprising a fast saturation coil and an air-core coil, wherein the fast saturation coil and the air-core coil are both arranged in the housing; An insulating bracket is connected to the shell, and the insulating bracket is arranged between the fast saturation coil and the air-core coil. The insulating bracket can insulate and isolate the fast saturation coil and the air-core coil to increase the creepage distance between the fast saturation coil and the air-core coil.

2. The mutual inductor according to claim 1, characterized in that: The insulating support comprises: Insulation body; A first connection portion, disposed on a first side of the insulating body, the first connection portion being connected to the fast saturation coil; a second connecting portion, disposed on a second side of the insulating body away from the first side, the second connecting portion being connected to the air-core coil; The third connection portion is disposed on at least one of the insulating body, the first connection portion or the second connection portion, and the third connection portion is directly or indirectly connected to the shell.

3. The mutual inductor according to claim 2, characterized in that: The first connecting portion is provided with a first accommodating cavity to at least partially accommodate the fast saturation coil; The second connecting portion is provided with a second accommodating cavity for at least partially accommodating the air-core coil.

4. The mutual inductor according to claim 2, characterized in that: The shell is provided with a fourth connection part, one of the third connection part and the fourth connection part is configured as a buckle, and the other of the third connection part and the fourth connection part is configured as a slot, and the buckle can be snapped into the slot.

5. The mutual inductor according to claim 2, characterized in that: The first connecting portion is configured as a U-shaped structure to match the shape of the fast saturation coil; The second connecting portion has an arc-shaped profile to match the shape of the hollow coil.

6. The mutual inductor according to claim 4, characterized in that: A detection hole is provided in the mutual inductor, the detection hole passes through the shell, and a conductor is passed through the detection hole; A positioning column is arranged in the shell, and the positioning column is arranged on the inner wall of the shell. The hollow coil abuts against the positioning column, and the positioning column and the second connecting part are respectively arranged on both sides of the detection hole to cooperate with each other to limit the hollow coil.

7. The mutual inductor according to claim 6, characterized in that: A fixing plate is arranged in the housing, and the fourth connecting portion is arranged on the fixing plate; The fixing plate is fixedly connected to the positioning column.

8. The mutual inductor according to claim 6, characterized in that: The housing comprises a first housing and a second housing, the first housing and the second housing are buckled to form a receiving cavity, the detection assembly and the insulating bracket are both arranged in the receiving cavity; The detection hole passes through the first shell and the second shell, and an isolation tube is provided between the detection hole and the accommodating cavity to insulate and isolate the detection hole from the accommodating cavity.

9. The mutual inductor according to claim 8, characterized in that: A buckle is also provided at the joint between the first shell and the second shell to fix the first shell and the second shell.

10. A circuit breaker, characterized in that: The circuit breaker comprises: A busbar module, wherein the busbar module comprises a static busbar and a dynamic busbar; A contact module, wherein the contact module comprises a moving contact and a stationary contact, the stationary busbar is connected to the stationary contact, and the moving busbar is connected to the moving contact; and, The mutual inductor according to any one of claims 1 to 9, wherein the mutual inductor is sleeved on the moving busbar.

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