A zero sequence transformer assembly and a residual current circuit breaker

Abstract

This application discloses a zero-sequence current transformer assembly and a residual current circuit breaker, including a zero-sequence current transformer; characterized in that: it further includes an N-pole conductive plate, on which the zero-sequence current transformer is sleeved, and the N-pole conductive plate is a rigid conductive plate; one end of the N-pole conductive plate along its length is a wiring portion, and the other end is provided with a stationary contact; a first limiting portion is provided on the N-pole conductive plate, which abuts against the outer wall of the zero-sequence current transformer, limiting the zero-sequence current transformer in one direction along the length of the N-pole conductive plate; a first fastening structure is provided on the zero-sequence current transformer, which engages with a portion of the N-pole conductive plate, so that the N-pole conductive plate and the zero-sequence current transformer are connected as a whole; this application can realize the zero-sequence current transformer and the N-pole conductive plate as a whole, which is beneficial for assembly.

Description

Technical Field

[0001] This application relates to the electrical field, specifically to a zero-sequence current transformer assembly, particularly a miniature residual current circuit breaker. Background Technology

[0002] In the field of miniature residual current circuit breakers, it is currently difficult to achieve automated production, especially for N-pole structures. Its zero-sequence current transformers are often installed by soft connection (as disclosed in CN209515585U), which is very unfavorable for automated production.

[0003] Therefore, it is essential to design a zero-sequence current transformer assembly that integrates the N-pole conductive structure with the zero-sequence current transformer to facilitate automated production. Summary of the Invention

[0004] In view of this, the purpose of this application is to overcome the shortcomings of the prior art and to provide a zero-sequence current transformer assembly.

[0005] This application provides: a zero-sequence current transformer assembly, including a zero-sequence current transformer; wherein, it further includes an N-pole conductive plate, on which the zero-sequence current transformer is sleeved; one end of the N-pole conductive plate along its length is a wiring portion, and the other end is provided with a stationary contact; a first limiting portion is provided on the N-pole conductive plate, the first limiting portion abutting against the outer wall of the zero-sequence current transformer, limiting the zero-sequence current transformer in one direction along the length of the N-pole conductive plate; a first fastening structure is provided on the zero-sequence current transformer, the first fastening structure engaging with a portion of the N-pole conductive plate, so that the N-pole conductive plate and the zero-sequence current transformer are connected as a whole.

[0006] In some embodiments of this application, the first limiting portion is formed by stamping a portion of the N-polar conductive plate, or by bending a portion of the N-polar conductive plate.

[0007] In some embodiments of this application, the first fastening structure is a hook assembly that hooks onto the N-pole conductive plate, limiting the N-pole conductive plate in both width and height dimensions, so that the N-pole conductive plate and the zero-sequence current transformer are connected as a whole.

[0008] In some embodiments of this application, the hook assembly includes at least two hooks spaced apart in the height dimension of the N-polar conductive plate; the N-polar conductive plate is partially located in the gaps between the hooks, and the hooks hook the N-polar conductive plate in the width dimension; the hooks have guide surfaces for pressing the N-polar conductive plate.

[0009] In some embodiments of this application, the first fastening structure includes at least two bosses spaced apart in the height dimension of the N-pole conductive plate, and the N-pole conductive plate and the bosses are tightly fitted so that the N-pole conductive plate and the zero-sequence current transformer are connected as a whole.

[0010] In some embodiments of this application, the cross-sectional dimension of any point on the N-pole conductive plate is smaller than the cross-sectional dimension of the central hole of the zero-sequence current transformer.

[0011] In some embodiments of this application, the N-pole conductive plate includes a "Z"-shaped bend that passes through two different surfaces of the zero-sequence current transformer and the central hole of the zero-sequence current transformer. The axis of the central hole of the zero-sequence current transformer is perpendicular to the length dimension of the N-pole conductive plate.

[0012] In some embodiments of this application, the zero-sequence current transformer includes an upper surface and a lower surface. The "Z"-shaped bending portion includes a first straight portion, a second straight portion, and a connecting portion. The two ends of the connecting portion are bent and connected to the first straight portion and the second straight portion, respectively. The connecting portion passes through the central hole of the zero-sequence current transformer. The first straight portion is adjacent to the upper surface, and the second straight portion is adjacent to the lower surface. A first fastening structure is disposed on the upper surface and engages with the first straight portion. A first limiting portion is disposed on the first straight portion.

[0013] In some embodiments of this application, the zero-sequence current transformer includes an upper surface and a lower surface. The "Z"-shaped bending portion includes a first straight portion, a second straight portion, and a connecting portion. The two ends of the connecting portion are bent and connected to the first straight portion and the second straight portion, respectively. The connecting portion passes through the central hole of the zero-sequence current transformer. The first straight portion is adjacent to the upper surface, and the second straight portion is adjacent to the lower surface. A first fastening structure is disposed on the lower surface and engages with the second straight portion. A first limiting portion is disposed on the second straight portion.

[0014] In some embodiments of this application, the zero-sequence current transformer is provided with pins, one end of which is exposed outside the zero-sequence current transformer and electrically connected to the secondary winding inside the zero-sequence current transformer.

[0015] A residual current circuit breaker includes an N-pole housing, which further includes the aforementioned zero-sequence current transformer assembly; the N-pole housing is provided with a groove, and the N-pole conductive plate is at least partially embedded in the groove.

[0016] The advantages of this application compared to the prior art are: By replacing the N-pole main conductor with a rigid conductive plate (N-pole conductive plate), and using a first limiting part to limit the zero-sequence current transformer in one direction along the length of the N-pole conductive plate, and then using a first fastening structure to lock the N-pole conductive plate in place, a single unit is formed. This allows for simple assembly by placing this unit into the circuit breaker housing, meeting the design requirements for automated production of residual current circuit breakers. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of a residual current circuit breaker according to an embodiment of this application is shown; Figure 2 This diagram shows a schematic of the zero-sequence current transformer and the N-pole conductive plate as an integral unit according to an embodiment of this application. Figure 3 A schematic diagram of a zero-sequence current transformer according to an embodiment of this application is shown; Figure 4 A schematic diagram of the N-pole conductive plate according to an embodiment of this application is shown. Detailed Implementation

[0019] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0020] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0022] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "electrical connection," and "fixation," etc., should be interpreted broadly. For example, they can refer to a fixed electrical connection, a detachable electrical connection, or an integral connection; they can refer to a mechanical-electrical connection or an electro-electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0023] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature. Example

[0024] like Figures 1-4 As shown, an embodiment of this application is a residual current circuit breaker, which can provide leakage protection, overload protection and short circuit protection for the circuit it is connected to.

[0025] The residual current circuit breaker includes a circuit breaker housing, which includes an L-pole housing and an N-pole housing 100.

[0026] The L-pole housing contains the L-pole mechanism, L-pole contact assembly, and so on.

[0027] The N-pole housing 100 contains an N-pole mechanism, an N-pole contact assembly, a zero-sequence current transformer 300, and so on.

[0028] Here, the zero-sequence current transformer 300 and part of the N-pole contact assembly form a whole, specifically forming a zero-sequence current transformer 300 assembly.

[0029] Here, the zero-sequence current transformer 300 assembly includes a zero-sequence current transformer 300 and an N-pole conductive plate 200.

[0030] The zero-sequence current transformer 300 is mounted on the N-pole conductive plate 200. The first fastening structure 310a on the zero-sequence current transformer 300 is engaged with part of the N-pole conductive plate 200, so that the two form a whole and can be easily assembled together in the N-pole housing 100.

[0031] The N-pole conductive plate 200 is a rigid conductive plate; in this embodiment, it is a rigid copper plate, but other materials can also be used, as long as they possess both rigidity and conductivity. One end of the N-pole conductive plate 200 along its length dimension L is a wiring portion 210 for external wiring; the other end is provided with a stationary contact 220 for engaging with the N-pole moving contact. The N-pole conductive plate 200 has a first limiting portion 2301, which can block the outer wall of the zero-sequence current transformer 300, specifically blocking it in one direction along the length dimension L of the N-pole conductive plate 200. Figure 2 As shown, the left side is blocked, meaning that the zero-sequence current transformer 300 cannot move further to the left after being blocked by the first limiting part 2301. This first limiting part 2301 can ensure that the zero-sequence current transformer 300 and the first conductive plate are installed in place.

[0032] There are many ways to form the first limiting part 2301. For example, it can be formed by stamping a portion of the N-polar conductive plate 200, or by bending a portion of the N-polar conductive plate 200. In this embodiment, it is formed by stamping a portion of the N-polar conductive plate 200.

[0033] The zero-sequence current transformer 300 includes a transformer housing 310, a magnetic ring, and a secondary winding. The magnetic ring is disposed inside the transformer housing 310 and is used to be sleeved on the N-pole main line conductor and the L-pole main line conductor. The secondary winding is wound around the magnetic ring.

[0034] The first fastening structure 310a is formed on the transformer housing 310. There are many types of the first fastening structure 310a, such as a hook assembly or a tight fit structure.

[0035] In this embodiment, the first fastening structure 310a is a hook assembly that hooks onto the N-pole conductive plate 200, limiting the N-pole conductive plate 200 in both width dimension D and height dimension H. This limiting allows the N-pole conductive plate 200 and the zero-sequence current transformer 300 to be easily connected as a whole. Furthermore, the length dimension L is limited by the first limiting part 2301, ensuring that the structure formed by the zero-sequence current transformer 300 and the N-pole conductive plate 200 is very stable and easy to assemble.

[0036] Here, the latch assembly includes at least two latches spaced apart in the height dimension H of the N-polar conductive plate 200. The N-polar conductive plate 200 is partially positioned within the gaps in the latches, which hook onto the N-polar conductive plate 200 in the width dimension D. This achieves positioning limits in both the width dimension D and the height dimension H.

[0037] Meanwhile, the hook has a guide surface 310a1 for the N-polar conductive plate 200 to press. During installation, the N-polar conductive plate 200 presses the guide surface 310a1, causing the hook to deform and open, making it easier for the N-polar conductive plate 200 to enter the gap, so that the N-polar conductive plate 200 and the hook can cooperate. This installation structure is very simple.

[0038] In addition, the first fastening structure 310a can also adopt a tight fit method, for example, replacing the hook with two spaced protrusions, with the N-pole conductive plate 200 and the protrusions being tightly fitted, so that the N-pole conductive plate 200 and the zero-sequence current transformer 300 are connected as a whole.

[0039] For the N-pole conductive plate 200, the cross-sectional dimension at any point is smaller than the cross-sectional dimension of the central hole of the zero-sequence current transformer 300. This structural design allows the N-pole conductive plate 200 to be inserted into the zero-sequence current transformer 300 at any point, either through the wiring section 210 or through the stationary contact 220, which facilitates the assembly of the two.

[0040] Here, the N-pole conductive plate 200 includes a "Z"-shaped bend 230, which is the structure through which the N-pole conductive plate 200 passes through the zero-sequence current transformer 300. The "Z"-shaped bend 230 passes through two different surfaces of the zero-sequence current transformer 300 and the central hole of the zero-sequence current transformer 300. The axis of the central hole of the zero-sequence current transformer 300 is perpendicular to the length dimension L of the N-pole conductive plate 200.

[0041] Specifically, the "Z"-shaped bending portion 230 includes a first straight portion 230a, a second straight portion 230b, and a connecting portion 230c. The two ends of the connecting portion 230c are respectively bent and connected to the first straight portion 230a and the second straight portion 230b, all of which are right-angle bends. Of course, obtuse-angle bends can also be used in addition to this.

[0042] The zero-sequence current transformer 300 includes an upper surface 300a and a lower surface 300b. A connecting portion 230c passes through the central hole of the zero-sequence current transformer 300. A first straight portion 230a is adjacent to the upper surface 300a, and a second straight portion 230b is adjacent to the lower surface 300b. The first fastening structure 310a is disposed on the upper surface 300a and engages with the first straight portion 230a, while a first limiting portion 2301 is disposed on the first straight portion 230a. Alternatively, the first fastening structure 310a can also be disposed on the lower surface 300b and engage with the second straight portion 230b, with the first limiting portion 2301 disposed on the second straight portion 230b.

[0043] A pin 310b protrudes from the transformer housing 310. The pin 310b is exposed at one end of the transformer housing 310 and connected to the PCB board in the circuit breaker, so that the zero-sequence transformer 300 can be connected to the circuit. The pin 310b is located inside the transformer housing 310 and is soldered to the secondary winding.

[0044] The above structure is very easy to install. Simply place the assembled unit into the N-pole housing 100, align the N-pole conductive plate 200 with the groove 100a on the N-pole housing 100, and push it in until it is in place.

[0045] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0046] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A zero-sequence current transformer assembly, comprising a zero-sequence current transformer; characterized in that: It also includes an N-pole conductive plate, on which a zero-sequence current transformer is mounted. The N-pole conductive plate is a rigid conductive plate. One end of the N-pole conductive plate along its length is a wiring section, and the other end is provided with a stationary contact. A first limiting section is provided on the N-pole conductive plate, which abuts against the outer wall of the zero-sequence current transformer, limiting the zero-sequence current transformer in one direction along the length of the N-pole conductive plate. A first fastening structure is provided on the zero-sequence current transformer, which engages with a portion of the N-pole conductive plate to connect the N-pole conductive plate and the zero-sequence current transformer into a single unit.

2. A zero-sequence current transformer assembly according to claim 1, characterized in that: The first limiting part is formed by stamping a portion of the N-polar conductive plate, or by bending a portion of the N-polar conductive plate.

3. A zero-sequence current transformer assembly according to claim 1, characterized in that: The first fastening structure is a hook assembly, which hooks onto the N-pole conductive plate and limits the N-pole conductive plate in both width and height dimensions, so that the N-pole conductive plate and the zero-sequence current transformer are connected as a whole.

4. A zero-sequence current transformer assembly according to claim 3, characterized in that: The hook assembly includes at least two hooks spaced apart in the height dimension of the N-polar conductive plate; the N-polar conductive plate portion is located in the gaps between the hooks, and the hooks hook the N-polar conductive plate in the width dimension; the hooks have guide surfaces for pressing the N-polar conductive plate.

5. A zero-sequence current transformer assembly according to claim 1, characterized in that: The first fastening structure includes at least two bosses spaced apart along the height dimension of the N-pole conductive plate, wherein the N-pole conductive plate and the bosses are tightly fitted together so that the N-pole conductive plate and the zero-sequence current transformer are connected as a whole.

6. A zero-sequence current transformer assembly according to claim 1, characterized in that: The cross-sectional dimension of any point on the N-pole conductive plate is smaller than the cross-sectional dimension of the central hole of the zero-sequence current transformer.

7. A zero-sequence current transformer assembly according to claim 1, characterized in that: The N-pole conductive plate includes a "Z"-shaped bend that passes through two different surfaces of the zero-sequence current transformer and the central hole of the zero-sequence current transformer. The axis of the central hole of the zero-sequence current transformer is perpendicular to the length dimension of the N-pole conductive plate.

8. A zero-sequence current transformer assembly according to claim 7, characterized in that: The zero-sequence current transformer includes an upper surface and a lower surface. The "Z"-shaped bending section includes a first straight section, a second straight section, and a connecting section. The two ends of the connecting section are bent and connected to the first straight section and the second straight section, respectively. The connecting section passes through the central hole of the zero-sequence current transformer. The first straight section is adjacent to the upper surface, and the second straight section is adjacent to the lower surface. A first fastening structure is disposed on the upper surface and engages with the first straight section. A first limiting section is disposed on the first straight section. Alternatively, the zero-sequence current transformer includes an upper surface and a lower surface. The "Z"-shaped bending portion includes a first straight portion, a second straight portion, and a connecting portion. The two ends of the connecting portion are bent and connected to the first straight portion and the second straight portion, respectively. The connecting portion passes through the central hole of the zero-sequence current transformer. The first straight portion is adjacent to the upper surface, and the second straight portion is adjacent to the lower surface. A first fastening structure is disposed on the lower surface and engages with the second straight portion. A first limiting portion is disposed on the second straight portion.

9. A zero-sequence current transformer assembly according to claim 1, characterized in that: The zero-sequence current transformer has pins. One end of the pin is electrically connected to the secondary winding inside the zero-sequence current transformer, and the other end of the pin is exposed outside the zero-sequence current transformer.

10. A residual current circuit breaker, comprising a N-pole housing, characterized in that: It also includes a zero-sequence current transformer assembly as described in any one of claims 1-9; a groove is provided on the N-pole housing, and the N-pole conductive plate is at least partially embedded in the groove.

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