Transformer components, arc fault protectors

Abstract

The present invention provides a mutual inductor assembly and an arc fault protector. The mutual inductor assembly comprises a current mutual inductor and a zero-sequence mutual inductor, wherein the current mutual inductor and the zero-sequence mutual inductor share a phase conductor. The mutual inductor assembly and the arc fault protector according to the present invention have a simple and compact structure, which is conducive to the miniaturized design of the arc fault protector.

Description

Technical Field

[0001] The invention belongs to the technical field of circuit protection device manufacturing, and in particular relates to a mutual inductor component and an arc fault protector. Background Art

[0002] AFCI (Arc Fault Protector) is a new type of electrical appliance for electrical fire protection. It can effectively reduce the number and probability of electrical fires caused by arc faults and is widely used in various fields such as homes, office buildings, hospitals, municipalities and industries. In addition to arc fault protection, arc fault protectors generally integrate other safety protection functions, such as integrated leakage protection. Therefore, this arc fault protector includes at least two types of transformers, namely, a zero-sequence transformer and a current transformer. Whether it is a zero-sequence transformer or a current transformer, it has a transformer housing, a mutual inductance coil and a plug pin, wherein the secondary winding of the mutual inductance coil is connected to the plug pin as the induction signal output end of the transformer, and the mutual inductance coil and the plug pin are in the transformer housing.

[0003] In the prior art, the zero-sequence transformer and the current transformer are two independent component units. In specific applications, they are respectively installed in corresponding areas of the corresponding control board. For example, they may be on one side of the control board, or they may be on different sides. This distributed independent arrangement leads to a loose structure and a large size of the arc fault protector, and there is a disadvantage of complex process for connecting to the control board (the primary winding of the existing transformer is mostly welded to the control board with bare wire). Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to provide a mutual inductor assembly and an arc fault protector, which have a simple and compact structure and are conducive to the miniaturized design of the arc fault protector.

[0005] In order to solve the above problem, the present invention provides a transformer assembly, including a current transformer and a zero-sequence transformer, wherein the current transformer and the zero-sequence transformer share a phase line conductor.

[0006] Preferably, the current transformer includes a first shell and a first mutual inductance coil in the first shell, the zero-sequence transformer includes a second shell and a second mutual inductance coil in the second shell, the first shell and the second shell are coaxially stacked, the phase line conductor has a first induction segment, and the first induction segment passes through the central area of ​​the first mutual inductance coil and the central area of ​​the second mutual inductance coil in sequence.

[0007] Preferably, a first positioning column is constructed inside the first shell, and the first mutual inductance coil is sleeved on the outer peripheral wall of the first positioning column.

[0008] Preferably, a first through hole is formed on the first positioning column, and the first sensing segment passes through the first through hole.

[0009] Preferably, a limiting protrusion is configured at the end of the first positioning column, and a corresponding limiting groove is configured on a side plane of the second shell facing the first shell.

[0010] Preferably, the phase conductor has a first mounting section, and a first mounting groove corresponding to the first mounting section is configured on the outer peripheral wall of the first shell and / or the second shell.

[0011] Preferably, a first pin fixing portion is configured on the outer peripheral wall of the first housing for installing and fixing the first pin pair.

[0012] Preferably, the mutual inductor assembly further includes a first isolation plate, the first shell has a first opening facing one side of the second shell, and the first isolation plate is located between the first shell and the second shell and blocks the first opening.

[0013] Preferably, the outer periphery of the first isolation plate has a positioning protrusion, and the inner peripheral wall of the first shell is configured with a positioning groove corresponding to the positioning protrusion.

[0014] Preferably, a conductor positioning groove is constructed on one side plane of the first isolation plate.

[0015] Preferably, the zero-sequence mutual inductor further includes a neutral line conductor, the neutral line conductor has a second induction segment, and the second induction segment passes through a central area of ​​the second mutual inductance coil.

[0016] Preferably, a second positioning column is constructed inside the second shell, and the second mutual inductance coil is sleeved on the outer peripheral wall of the second positioning column.

[0017] Preferably, a second through hole communicating with the first through hole is formed on the second positioning column, and the first sensing segment passes through the second through hole.

[0018] Preferably, a third through hole is formed on the second positioning column, and the second sensing segment passes through the third through hole.

[0019] Preferably, the neutral conductor has a second mounting section, and a second mounting groove corresponding to the second mounting section is configured on the outer peripheral wall of the second shell.

[0020] Preferably, a second pin fixing portion is configured on the outer peripheral wall of the second housing for installing and fixing the second pin pair.

[0021] Preferably, the mutual inductor assembly further includes a second isolation plate, the second housing has a second opening on a side away from the first housing, and the second isolation plate can block the second opening.

[0022] The present invention also provides an arc fault protector, comprising the above-mentioned mutual inductor assembly.

[0023] The present invention provides a transformer assembly and an arc fault protector, which connect the current transformer and the zero-sequence transformer into one by sharing the phase line conductor to form a modular design. The integrated transformer assembly has a simpler and more compact structure, which is conducive to the miniaturized design of the arc fault protector. Specifically, it has a smaller connection area requirement when assembled with a control board. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram of the three-dimensional structure of a mutual inductor assembly according to an embodiment of the present invention;

[0025] Figure 2 is a schematic cross-sectional structure diagram of a mutual inductor assembly according to an embodiment of the present invention;

[0026] Figure 3 Schematic diagram of the exploded structure of the mutual inductor assembly of an embodiment of the present invention (the first mutual inductance coil and the second mutual inductance coil are omitted);

[0027] Figure 4 for Figure 1 Schematic diagram of the three-dimensional structure of the phase line conductor;

[0028] Figure 5 for Figure 1 Schematic diagram of the three-dimensional structure of the center line conductor;

[0029] Figure 6 for Figure 1 A schematic diagram of the three-dimensional structure of the first isolation plate;

[0030] Figure 7 for Figure 1 A schematic diagram of the three-dimensional structure of the first shell;

[0031] Figure 8 for Figure 1 Schematic diagram of the three-dimensional structure of the second shell.

[0032] The reference numerals are as follows:

[0033] 11. First shell; 111. First pin fixing portion; 12. First mutual inductance coil; 13. First positioning column; 131. First through hole; 132. Limiting protrusion; 21. Second shell; 211. Second pin fixing portion; 22. Second mutual inductance coil; 23. Second positioning column; 231. Second through hole; 232. Third through hole; 3. Phase conductor; 31. First induction section; 32. First installation section; 41. First pin pair; 42. Second pin pair; 51. First isolation plate; 511. Positioning protrusion; 512. Conductor positioning groove; 52. Second isolation plate; 6. Neutral conductor; 61. Second induction section; 62. Second installation section. DETAILED DESCRIPTION

[0034] See also Figures 1 to 8 As shown, according to an embodiment of the present invention, a transformer assembly is provided, including a current transformer and a zero-sequence transformer, wherein the current transformer and the zero-sequence transformer share a phase conductor 3, and further, the current transformer and the zero-sequence transformer are coaxially stacked with the phase conductor 3 as an axis to form an integral body. It can be seen that in this technical solution, the current transformer and the zero-sequence transformer are connected as a whole by sharing the phase conductor 3 to form a modular design, and the structure of the integrated transformer assembly is simpler and more compact, which is conducive to the miniaturization design of the arc fault protector. Specifically, when it is assembled with the control board, it has a smaller connection area requirement.

[0035] Specifically, the current transformer includes a first shell 11 and a first mutual inductance coil 12 in the first shell 11, the zero-sequence mutual inductance coil includes a second shell 21 and a second mutual inductance coil 22 in the second shell 21, the first shell 11 and the second shell 21 are coaxially stacked, the phase conductor 3 has a first induction segment 31, and the first induction segment 31 passes through the central area of ​​the first mutual inductance coil 12 and the central area of ​​the second mutual inductance coil 22 in sequence. It is worth mentioning that after the first mutual inductance coil 12 is assembled with the first positioning column 13, that is, after the position of the first mutual inductance coil 12 in the first shell 11 is determined, it is best to fill glue or add a rubber pad (not shown in the figure) in the gap between the first shell 11 and the first mutual inductance coil 12 to prevent the mutual inductance assembly from vibrating and generating noise or damaging the first mutual inductance coil 12 when working. At this time, preferably, a first through hole 131 is constructed on the first positioning column 13, and the first induction segment 31 passes through the first through hole 131. Furthermore, the cross-sectional shape of the first through hole 131 matches the cross-sectional shape of the first induction segment 31, so that the first induction segment 31 can position the phase line conductor 3 while realizing mutual induction.

[0036] In order to increase the electrical safety distance between the phase conductor 3 and the neutral conductor 6, that is, to increase the electrical safety creepage distance, preferably, a limiting protrusion 132 is constructed at the end of the first positioning column 13, and a corresponding limiting groove is constructed on a side plane of the second shell 21 facing the first shell 11. When the first shell 11 and the second shell 21 are assembled, the limiting protrusion 132 can be embedded in the limiting groove.

[0037] Preferably, the phase conductor 3 has a first mounting section 32, and a first mounting groove corresponding to the first mounting section 32 is configured on the outer peripheral wall of the first shell 11 and / or the second shell 21. The first mounting groove may be, for example, a groove structure, or may be any structure such as a snap-fit ​​structure that can tightly connect and fix the first mounting section 32 to the first shell 11 or the second shell 21. It can be understood that the first mounting section 32 is located on the outside of the first shell 11 or the second shell 21. Figure 1 As shown, the first mounting section 32 is positioned and installed in a snap-on stop structure provided on the outer peripheral wall of the second housing 21. A power supply (current) introduction structure, such as a contact, a pin, etc., is provided at a corresponding position of the first mounting section 32 or the first sensing section 31. Furthermore, a first pin fixing portion 111 is configured on the outer peripheral wall of the first housing 11 for installing and fixing the first pin pair 41.

[0038] Preferably, the transformer assembly also includes a first isolation plate 51, the first shell 11 has a first opening facing the second shell 21, the first isolation plate 51 is between the first shell 11 and the second shell 21 and blocks the first opening. It can be understood that the first isolation plate 51 is mainly used to perform necessary insulation isolation between the first mutual inductance coil 12 and the neutral conductor 6 in the zero-sequence transformer to prevent the first mutual inductance coil 12 from short-circuiting and burning. The first isolation plate 51 has a positioning protrusion 511 on its outer periphery, and a positioning groove corresponding to the positioning protrusion 511 is constructed on the inner peripheral wall of the first shell 11, that is, the first isolation plate 51 is positioned and installed in the positioning groove through the positioning protrusion 511. Preferably, a plurality of positioning protrusions 511 can be provided on the outer periphery of the first isolation plate 51, and the spacings between the plurality of positioning protrusions 511 are unequal, thereby ensuring the uniqueness of the installation orientation of the first isolation plate 51, especially when a conductor positioning groove 512 is constructed on a side plane of the first isolation plate 51, the conductor positioning groove 512 is used to perform installation positioning and guiding for the neutral conductor 6.

[0039] The neutral conductor 6 has a second induction segment 61, and the second induction segment 61 passes through the central area of ​​the second mutual induction coil 22. Similar to the structural features of the first shell 11, a second positioning column 23 is constructed inside the second shell 21, and the second mutual induction coil 22 is sleeved on the outer peripheral wall of the second positioning column 23. The second positioning column 23 is configured with a second through hole 231 that penetrates the first through hole 131, and the first induction segment 31 passes through the second through hole 231. The second positioning column 23 is also configured with a third through hole 232, and the second induction segment 61 passes through the third through hole 232. The first induction segment 31 and the second induction segment 61 isolate the physical part of the second positioning column 23 from the electrical characteristics.

[0040] The neutral conductor 6 has a second mounting section 62, and a second mounting groove corresponding to the second mounting section 62 is constructed on the outer peripheral wall of the second shell 21. In order to optimize the external wiring space of the transformer assembly, the second mounting groove and the first mounting groove are preferably located on both sides of the second shell 21, that is, there is an angle between the phase conductor 3 and the neutral conductor 6 when viewed on the axial projection plane of the transformer assembly. Preferably, a second pin fixing portion 211 is constructed on the outer peripheral wall of the second shell 21 for installing and fixing the second pin 42. It can be understood that, whether it is the second pin 42 here or the first pin 41 mentioned above, the end thereof inserted into the corresponding pin fixing portion should be electrically connected to the first mutual inductance coil 12 or the second mutual inductance coil 22.

[0041] Preferably, the mutual inductor assembly also includes a second isolation plate 52, the second shell 21 has a second opening on the side away from the first shell 11, and the second isolation plate 52 can block the second opening to isolate the second mutual inductance coil 22 from other electrical components on the control board to prevent the second mutual inductance coil from short-circuiting and burning.

[0042] According to an embodiment of the present invention, an arc fault protector is further provided, comprising the above-mentioned transformer assembly. The transformer assembly has a simple and compact structure, which is conducive to the miniaturized design of the arc fault protector.

[0043] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0044] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention, and these improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A mutual inductor assembly, characterized in that: The invention comprises a current transformer and a zero-sequence transformer, wherein the current transformer and the zero-sequence transformer share a phase conductor (3); the current transformer comprises a first shell (11) and a first mutual inductance coil (12) in the first shell (11); the zero-sequence transformer comprises a second shell (21) and a second mutual inductance coil (22) in the second shell (21); the first shell (11) and the second shell (21) are coaxially stacked, the opening of the first shell (11) faces the second shell (21), and the second shell (21) is Towards a side away from the first shell (11), the phase conductor (3) has a first induction segment (31), the first induction segment (31) passes through the central area of ​​the first mutual induction coil (12) and the central area of ​​the second mutual induction coil (22) in sequence, a first positioning column (13) is constructed inside the first shell (11), the first mutual induction coil (12) is sleeved on the outer peripheral wall of the first positioning column (13), the first positioning column (13) is constructed with a first through hole (131), the first induction segment (31) The zero-sequence mutual inductor further comprises a neutral conductor (6), the neutral conductor (6) having a second induction segment (61), the second induction segment (61) passing through the central area of ​​the second mutual inductance coil (22); a second positioning column (23) is constructed inside the second housing (21), the second mutual inductance coil (22) is sleeved on the outer peripheral wall of the second positioning column (23); a second positioning column (23) is constructed on the second positioning column (23) and is in communication with the first through hole (131). ), the first sensing section (31) passes through the second through hole (231), and the cross-sectional shape of the first through hole (131) matches the cross-sectional shape of the first sensing section (31); a third through hole (232) is configured on the second positioning column (23), and the second sensing section (61) passes through the third through hole (232); a limiting protrusion (132) is configured at the end of the first positioning column (13), and a corresponding limiting groove is configured on a side plane of the second shell (21) facing the first shell (11).

2. The mutual inductor assembly according to claim 1, characterized in that: The phase conductor (3) has a first mounting section (32), and a first mounting groove corresponding to the first mounting section (32) is formed on the outer peripheral wall of the first shell (11) and / or the second shell (21).

3. The mutual inductor assembly according to claim 1, characterized in that: A first pin fixing portion (111) is formed on the outer peripheral wall of the first housing (11) and is used to install and fix the first pin pair (41).

4. The mutual inductor assembly according to claim 1, characterized in that: It also includes a first isolation plate (51), the first shell (11) has a first opening facing one side of the second shell (21), and the first isolation plate (51) is located between the first shell (11) and the second shell (21) and blocks the first opening.

5. The mutual inductor assembly according to claim 4, characterized in that: The outer periphery of the first isolation plate (51) is provided with a positioning protrusion (511), and the inner peripheral wall of the first shell (11) is provided with a positioning groove corresponding to the positioning protrusion (511).

6. The mutual inductor assembly according to claim 4, characterized in that: A conductor positioning groove (512) is formed on a plane side of the first isolation plate (51).

7. The mutual inductor assembly according to claim 1, characterized in that: The neutral conductor (6) has a second mounting section (62), and a second mounting groove corresponding to the second mounting section (62) is configured on the outer peripheral wall of the second shell (21).

8. The mutual inductor assembly according to claim 1, characterized in that: A second plug pin fixing portion (211) is formed on the outer peripheral wall of the second housing (21) and is used to install and fix the second plug pin pair (42).

9. The mutual inductor assembly according to claim 1, characterized in that: It also includes a second isolation plate (52), the second shell (21) has a second opening on a side away from the first shell (11), and the second isolation plate (52) can block the second opening.

10. An arc fault protector, comprising a mutual inductor assembly, characterized in that: The mutual inductor assembly is the mutual inductor assembly according to any one of claims 1 to 9.

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