Circuit breaker
By installing a disconnecting switch inside the circuit breaker, the connection or disconnection of the power electronic branch and the energy absorption branch can be clearly controlled, which solves the problem of not being able to determine the disconnection status of the branch in the prior art and improves the safety and stability of the line.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-04
- Publication Date
- 2026-03-20
AI Technical Summary
When a mechanical branch of a current solid-state circuit breaker is disconnected, there may still be power in the circuit, making it impossible to know whether other branches are disconnected, which can lead to safety hazards.
A disconnecting switch is installed inside the circuit breaker to clearly indicate the connection or disconnection of the power electronic branch and the energy absorption branch. The branch status is indicated by a clear contact to ensure line safety.
By clearly indicating the branch status through disconnecting switches, the safety and stability of the line are improved, and the safety risks of operation and maintenance are reduced.
Smart Images
Figure CN224020646U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of electrical equipment, specifically, relates to a low voltage circuit breaker. BACKGROUND
[0002] In the existing solid state circuit breaker technology, the mixed solid state circuit breaker has certain safety hidden danger in the actual application due to its unique structural characteristics. Specifically, when the mechanical branch is disconnected, although the circuit breaker is in the "split" state, there may be energization in the circuit, and the other branches cannot be explicitly known whether they have been disconnected, thus bringing potential safety risks to operation and maintenance. SUMMARY
[0003] The utility model discloses a circuit breaker which can explicitly know the disconnection of the branch and effectively guarantee the safe operation of the line.
[0004] The embodiment of the utility model is realized as follows:
[0005] In the first aspect, the utility model provides a circuit breaker, which comprises a first branch, a second branch, a main circuit, a branch switch and an isolating switch.
[0006] The first branch and the second branch are connected in parallel to the main circuit, the branch switch is arranged in the first branch, the second branch is provided with a parallel power electronic branch and an energy absorption branch, and the isolating switch is arranged in the second branch and used for simultaneously connecting or disconnecting the power electronic branch and the energy absorption branch.
[0007] In the optional implementation, the isolating switch comprises a shell, a static contact and a movable contact arranged in the shell, the movable contact is rotatably arranged in the shell and used for contacting or separating from the static contact, and the static contact is used for connecting with a positive circuit or a negative circuit of the main circuit.
[0008] In the optional implementation, the static contact is provided with a first contact part and a second contact part, the movable contact comprises a main contact and an arc contact, the main contact is used for contacting the first contact part later, and the arc contact is used for contacting the second contact part first.
[0009] In the process of separating the movable contact from the static contact, and after the main contact separates from the first contact part, the arc contact separates from the second contact part.
[0010] In the optional implementation, the shell is provided with a rotating shaft, the main contact and the arc contact are rotatably arranged on the rotating shaft, and the length of the arc contact is greater than that of the main contact.
[0011] In an optional embodiment, the number of the moving contact and the stationary contact is two, the two stationary contacts are centrally symmetrically arranged about the rotating shaft, the number of the main contact and the arc contact is also two, and the two main contacts and the two arc contacts are respectively arranged on two sides of the rotating shaft; the two moving contacts arranged on the two sides of the rotating shaft are insulated from each other.
[0012] In an optional embodiment, the disconnector further comprises two connecting pieces, the two connecting pieces are arranged in the shell and are respectively connected with one end of the stationary contact corresponding to the moving contact, one of the connecting pieces is used in common with one of the stationary contacts to connect with the positive line, and the other of the connecting pieces is used in common with the other of the stationary contacts to connect with the negative line.
[0013] In an optional embodiment, the disconnector further comprises an arc extinguishing chamber, the arc extinguishing chamber is arranged in the shell and is located at one end of the arc contact.
[0014] In an optional embodiment, the arc extinguishing chamber comprises a plurality of arc extinguishing pieces, the plurality of arc extinguishing pieces are arranged at intervals, and the plurality of arc extinguishing pieces are respectively provided with grooves to form arc extinguishing channels, and the movement path of the arc contact is located in the arc extinguishing channels.
[0015] In an optional embodiment, the disconnector further comprises two insulation pieces, the two insulation pieces are arranged on two sides of the movement path of the arc contact to form insulation channels, and the end portions of the two insulation pieces are embedded in the arc extinguishing channels.
[0016] In an optional embodiment, the main contact and the arc contact are arranged at intervals along the axial direction of the rotating shaft; and / or, the main contact and the arc contact are in an integrated structure.
[0017] The circuit breaker has the beneficial effects that the disconnector is arranged in the circuit breaker, i.e., the disconnector is arranged in the second branch in parallel with the power electronic branch and the energy absorption branch, so that the power electronic branch and the energy absorption branch are connected or disconnected through the disconnector, the state of the two branches is indicated through the clear contact, and the line safety is ensured. BRIEF DESCRIPTION OF DRAWINGS
[0018] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will be briefly introduced the drawings needed to be used in the embodiments, it should be understood, the following drawings only shows some embodiments of the utility model, therefore should not be regarded as the limitation to the range, for the ordinary skilled person in the art, under the premise of not paying the creative labor, still can obtain other related drawings according to these drawings.
[0019] Figure 1The circuit breaker schematic diagram one provided by the utility model provides one of the embodiments of the utility model;
[0020] Figure 2 The circuit breaker schematic diagram two provided by the utility model provides another of the embodiments of the utility model;
[0021] Figure 3 The circuit breaker structure schematic diagram provided by the utility model provides the circuit breaker structure schematic diagram provided by the utility model;
[0022] Figure 4 The isolator structure schematic diagram provided by the utility model provides the isolator structure schematic diagram provided by the utility model;
[0023] Figure 5 The isolator partial structure schematic diagram one provided by the utility model provides one of the embodiments of the utility model;
[0024] Figure 6 The isolator partial structure schematic diagram two provided by the utility model provides another of the embodiments of the utility model;
[0025] Figure 7 The isolator positive line schematic diagram provided by the utility model provides the isolator positive line schematic diagram provided by the utility model;
[0026] Figure 8 The isolator negative line schematic diagram provided by the utility model provides the isolator negative line schematic diagram provided by the utility model;
[0027] Figure 9 The isolator partial structure schematic diagram three provided by the utility model provides another of the embodiments of the utility model;
[0028] Figure 10 The isolator another embodiment structure schematic diagram provided by the utility model provides another of the embodiments of the utility model.
[0029] Icon: 10 - circuit breaker;100 - isolator;110 - shell;111 - rotating shaft;120 - static contact;121 - first contact part;122 - second contact part;130 - moving contact;131 - main contact;132 - arc contact;140 - wiring part;150 - wire;160 - arc extinguishing chamber;161 - arc extinguishing sheet;162 - groove;163 - arc extinguishing passage;170 - insulating part;171 - insulating passage;200 - first branch;300 - second branch;310 - power electronic branch;320 - energy absorption branch;400 - main circuit;500 - branch switch. DETAILED DESCRIPTION
[0030] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.
[0031] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.
[0032] It should be noted that: similar reference numbers and letters represent 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.
[0033] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, or the orientations or positional relationships in which the product of the present application is usually placed, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third", etc. are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.
[0034] In addition, the terms "horizontal", "vertical", etc. do not mean that the components must be absolutely horizontal or vertical, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.
[0035] In the description of the present application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0036] In the existing solid-state circuit breaker technology, the solid-state circuit breaker has certain safety hazards in actual application due to its unique structural characteristics. Specifically, when the mechanical branch is disconnected, although the circuit breaker is in the "split" state, there may still be energization in the circuit, and the other branches cannot explicitly know whether they have been disconnected, thus bringing potential safety risks to operation and maintenance.
[0037] Based on the problems in the prior art, referring to Figures 1 to 3 The utility model embodiment provides a circuit breaker 10 applied to the electrical equipment field.
[0038] In detail, the circuit breaker 10 includes a first branch 200, a second branch 300, a main circuit 400, a branch switch 500, and a disconnecting switch 100.
[0039] Among them, the first branch 200 and the second branch 300 are connected in parallel to the main circuit 400, the branch switch 500 is arranged in the first branch 200, the second branch 300 is provided with a parallel power electronic branch 310 and an energy absorption branch 320, and the disconnecting switch 100 is arranged in the second branch 300, used for simultaneously connecting or disconnecting the power electronic branch 310 and the energy absorption branch 320.
[0040] In this embodiment, the disconnecting switch 100 is built into the inside of the circuit breaker 10, that is, the disconnecting switch 100 is arranged in the second branch 300 provided with the parallel power electronic branch 310 and the energy absorption branch 320, so that the power electronic branch 310 and the energy absorption branch 320 can be explicitly connected or disconnected through the disconnecting switch 100, thereby ensuring the safety of the line by explicitly indicating the state of the two branches.
[0041] It is worth mentioning that the first branch 200 and the second branch 300 are connected in parallel and are connected to the main circuit 400, and the main circuit 400 is used for connecting the positive line or the negative line; among them, the first branch 200 is a mechanical branch, passing through the rated current and the initial stage fault current, the power electronic branch 310 is a fault current commutation path and a branch for breaking the fault current, and the energy absorption branch 320 is a branch for absorbing fault energy.
[0042] Further, referring to Figures 4 to 6 The disconnecting switch 100 includes a housing 110, a static contact 120, and a moving contact 130.
[0043] The static contact 120 is arranged on the shell 110, and the static contact 120 is provided with a first contact part 121 and a second contact part 122; the dynamic contact 130 is movably arranged on the shell 110, and the dynamic contact 130 comprises a main contact 131 and an arc contact 132, the main contact 131 is used for contacting the first contact part 121, and the arc contact 132 is used for contacting the second contact part 122; wherein, during the opening of the dynamic contact 130 and the static contact 120, and after the main contact 131 is separated from the first contact part 121, the arc contact 132 is separated from the second contact part 122.
[0044] In the embodiment, by arranging one main contact 131 and one arc contact 132 on the dynamic contact 130, when closing, the main contact 131 is contacted after the first contact part 121 of the static contact 120, and the arc contact 132 is contacted first with the second contact part 122 of the static contact 120, so as to realize that the main contact 131 and the arc contact 132 jointly bear the current in the circuit, which not only can improve the short-time withstand capability, but also can adapt to the use scene of high voltage, thereby improving the adaptability of the disconnector 100; in addition, during the opening, the arc contact 132 is disconnected from the static contact 120 after the main contact 131 is disconnected from the static contact 120, so that the electric arc appears on the arc contact 132 and is extinguished, which not only protects the main contact 131, but also effectively improves the breaking capacity of the disconnector 100, thereby improving the use stability and service life of the disconnector 100.
[0045] It is worth mentioning that the dynamic contact 130 can be slidably arranged on the shell 110, or can be rotatably arranged on the shell 110, which can be determined according to the actual product demand, and is not specifically limited here.
[0046] In the embodiment, the structure of the inverted dynamic contact 130 is described.
[0047] In detail, the shell 110 is provided with a rotating shaft 111, and the main contact 131 and the arc contact 132 are rotatably arranged on the rotating shaft 111, and the length of the arc contact 132 is greater than the length of the main contact 131.
[0048] Because the length of the arc contact 132 is greater than the length of the main contact 131, when the dynamic contact 130 is opened with the static contact 120, the “overtravel” of the arc contact 132 is greater than the “overtravel” of the main contact 131, so that the arc contact 132 is disconnected from the static contact 120 after the main contact 131 is disconnected from the static contact 120, which can make the electric arc appear on the arc contact 132 and finally extinguish.
[0049] Further, the number of the static contacts 120 is two, the two static contacts 120 are centrally symmetric about the rotation shaft 111, the number of the main contacts 131 and the arc contacts 132 is also two, and the two main contacts 131 and the two arc contacts 132 are respectively located on the two sides of the rotation shaft 111. The moving contacts 130 located on the two sides of the rotation shaft 111 are insulated from each other.
[0050] It can be understood that, since the two main contacts 131 and the two arc contacts 132 respectively correspond to the first contact part 121 and the second contact part 122 of the static contact 120, the two main contacts 131 are also centrally symmetric about the rotation shaft 111, and the two arc contacts 132 are also centrally symmetric about the rotation shaft 111.
[0051] Further, the disconnector 100 further comprises two wiring pieces 140, the two wiring pieces 140 are both arranged in the shell 110 and are both connected with the moving contact 130 through the soft connection wire 150.
[0052] It can be understood that, since the two main contacts 131 and the two arc contacts 132 respectively correspond to the first contact part 121 and the second contact part 122 of the static contact 120, the two main contacts 131 are also centrally symmetric about the rotation shaft 111, and the two arc contacts 132 are also centrally symmetric about the rotation shaft 111.
[0053] Further, the disconnector 100 further comprises two wiring pieces 140, the two wiring pieces 140 are both arranged in the shell 110 and are both connected with the moving contact 130 through the soft connection wire 150.
[0054] In the embodiment, as shown in Figure 7 , the disconnector 100 forms a positive circuit through the static contact 120, the moving contact 130, the soft connection wire 150 and the wiring piece 140; as shown in Figure 8 , the disconnector 100 further forms a negative circuit through the other static contact 120, the moving contact 130, the soft connection wire 150 and the other wiring piece 140.
[0055] Therefore, when the moving contact 130 contacts the static contact 120, the positive circuit and the negative circuit are simultaneously connected; and when the moving contact 130 separates from the static contact 120, the positive circuit and the negative circuit are simultaneously disconnected.
[0056] Further, please continue to refer to Figure 4 , Figure 5 and Figure 9The disconnector switch 100 also includes an arc-extinguishing chamber 160, which is disposed in the housing 110 and located at one end of the arc contact 132.
[0057] In this embodiment, in order to further improve the arc extinguishing capability of the disconnecting switch 100, an arc extinguishing chamber 160 is provided inside the housing 110 and at the end of the arc contact 132, so that after the arc is generated in the arc contact 132, it can be introduced into the arc extinguishing chamber 160 and extinguished quickly.
[0058] In detail, the arc-extinguishing chamber 160 includes a plurality of arc-extinguishing plates 161, which are spaced apart and each of the arc-extinguishing plates 161 is provided with a groove 162 to form an arc-extinguishing channel 163, and the movement path of the arc contact 132 is located within the arc-extinguishing channel 163.
[0059] In this embodiment, by providing grooves 162 on one side of multiple arc-extinguishing plates 161 facing the arc contact 132, and forming a relatively narrow arc-extinguishing channel 163 with the multiple grooves 162, the arc contact 132 moves within the arc-extinguishing channel 163 during the closing or opening process. As a result, the generated arc is affected by the narrow arc-extinguishing channel 163. Even if the electromagnetic attraction formed by the small current is not strong, the arc will quickly enter the arc-extinguishing chamber 160, thereby solving the arc-extinguishing problem of the critical current in the small current circuit.
[0060] Furthermore, the disconnector switch 100 also includes two insulating members 170, which are disposed on both sides of the movement path of the arc contact 132 to form an insulating channel 171, and the ends of the two insulating members 170 are embedded in the arc extinguishing channel 163.
[0061] In this embodiment, the insulating element 170 is sheet-shaped, and the two insulating elements 170 are arranged in parallel. By providing two insulating elements 170 on both sides of the arc contact 132 to form a narrow insulating channel 171, the arc extinguishing capability is further improved.
[0062] It is worth mentioning that, since the disconnector switch 100 usually requires a certain current-carrying cross-section to carry the current, an arc contact 132 that is only smaller than the width of the insulation channel 171 is insufficient to carry the current in all application scenarios, and will also cause problems such as excessive temperature of the arc contact 132. Therefore, a main contact 131 is also provided on one side of the arc contact 132. The main contact 131 and the arc contact 132 jointly carry the current to adapt to more application scenarios, thereby improving the adaptability of the disconnector switch 100.
[0063] Furthermore, the main contact 131 and the arc contact 132 are spaced apart along the axial direction of the rotating shaft 111. In other words, the main contact 131 and the arc contact 132 can be formed by connecting two independent structures. Of course, in other embodiments of this utility model, such as... Figure 10The main contact 131 and the arc contact 132 are in an integral structure, which is simple in process, low in cost, capable of reducing equipment procedures, and high in structural strength.
[0064] In conclusion, the circuit breaker 10 is provided, the disconnector 100 is built-in to the inside of the circuit breaker 10, i.e. the disconnector 100 is arranged at the second branch 300 provided with the power electronic branch 310 and the energy absorption branch 320 in parallel, so that the power electronic branch 310 and the energy absorption branch 320 are turned on or turned off through the disconnector 100, thereby the state of the two branches is indicated through the explicit contact, so as to ensure the line safety.
[0065] The above merely describes the preferred embodiments of the utility model and is not used to limit the utility model, and the utility model can have various changes and variations for the person skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.
Claims
1. A circuit breaker, characterized in that, It includes the first branch (200), the second branch (300), the main circuit (400), the branch switch (500), and the disconnect switch (100); The first branch (200) and the second branch (300) are connected in parallel in the main circuit (400). The branch switch (500) is located in the first branch (200). The second branch (300) is provided with a power electronic branch (310) and an energy absorption branch (320) connected in parallel. The disconnecting switch (100) is located in the second branch (300) and is used to simultaneously connect or disconnect the power electronic branch (310) and the energy absorption branch (320).
2. The circuit breaker according to claim 1, characterized in that, The disconnect switch (100) includes a housing (110) and a stationary contact (120) and a moving contact (130) disposed in the housing (110). The moving contact (130) is rotatably disposed in the housing (110) and is used to contact or separate from the stationary contact (120). The stationary contact (120) is used to connect to the positive or negative circuit of the main circuit (400).
3. The circuit breaker according to claim 2, characterized in that, The stationary contact (120) is provided with a first contact portion (121) and a second contact portion (122), and the moving contact (130) includes a main contact (131) and an arc contact (132). The main contact (131) is used to make subsequent contact with the first contact portion (121), and the arc contact (132) is used to make initial contact with the second contact portion (122). During the opening process of the moving contact (130) and the stationary contact (120), and after the main contact (131) separates from the first contact portion (121), the arc contact (132) separates from the second contact portion (122).
4. The circuit breaker according to claim 3, characterized in that, The housing (110) is provided with a rotating shaft (111), and the main contact (131) and the arc contact (132) are rotatably disposed on the rotating shaft (111). The length of the arc contact (132) is greater than the length of the main contact (131).
5. The circuit breaker according to claim 4, characterized in that, There are two moving contacts (130) and two stationary contacts (120). The two stationary contacts (120) are arranged symmetrically about the rotating shaft (111). There are also two main contacts (131) and two arc contacts (132). The two main contacts (131) and the two arc contacts (132) are located on both sides of the rotating shaft (111). The two moving contacts (130) located on both sides of the rotating shaft (111) are insulated from each other.
6. The circuit breaker according to claim 5, characterized in that, The disconnect switch (100) further includes two connectors (140). Both connectors (140) are disposed in the housing (110) and are connected to the end of a moving contact (130) away from the corresponding stationary contact (120) via wires (150). One connector (140) and one stationary contact (120) are used together to connect to the positive line, and the other connector (140) and the other stationary contact (120) are used together to connect to the negative line.
7. The circuit breaker according to claim 3, characterized in that, The disconnecting switch (100) further includes an arc-extinguishing chamber (160), which is disposed in the housing (110) and located at one end of the arc contact (132).
8. The circuit breaker according to claim 7, characterized in that, The arc-extinguishing chamber (160) includes a plurality of arc-extinguishing plates (161), which are spaced apart and each of the plurality of arc-extinguishing plates (161) is provided with a groove (162) to form an arc-extinguishing channel (163). The movement path of the arc contact (132) is located within the arc-extinguishing channel (163).
9. The circuit breaker according to claim 8, characterized in that, The disconnect switch (100) also includes two insulating members (170), which are disposed on both sides of the movement path of the arc contact (132) to form an insulating channel (171), and the ends of the two insulating members (170) are embedded in the arc extinguishing channel (163).
10. The circuit breaker according to claim 4, characterized in that, The main contact (131) and the arc contact (132) are spaced apart along the axial direction of the rotating shaft (111); and / or, the main contact (131) and the arc contact (132) are integrally formed.