Current transformer

Abstract

The utility model discloses a current transformer which comprises a shell, a support and an electromagnetic assembly, the support is arranged in the shell, the electromagnetic assembly is connected to the support, the electromagnetic assembly comprises a magnetic core winding, a conductor and a plurality of pins, the magnetic core winding is arranged in the shell and comprises a magnetic core and a coil, the coil is wound on the magnetic core and connected to the pins, and the conductor is arranged in the shell. One part of the conductor is located in the shell and penetrates through the magnetic core, the other part of the conductor is located outside the shell, one part of the pin is located in the shell and is inserted into the support so that the pin and the support can be fixed, the coil is connected to the pin, and the other part of the pin is located outside the shell. According to the utility model, the support is used as a carrier of the mutual inductor main body, and compared with the shell, the support is smaller in size and more flexible in structural design, so that the part of the support, which is used for inserting the pins, can be manufactured to be thicker, the pins can be fixed more firmly, and the pins are not easy to bend and shake when being inserted into the mounting holes in the circuit board; and the installation efficiency of the pins is improved.

Description

Technical Field

[0001] The utility model relates to a current transformer. Background Art

[0002] A current transformer is an instrument that converts large primary currents into smaller secondary currents for measurement based on the principle of electromagnetic induction. Currently, current transformers in the existing technology generally include a housing, a magnetic core winding, a conductor, and multiple pins. The magnetic core winding is installed within the housing, and the pins are usually mounted directly on the housing. To increase the fixing strength of the pins, the portion of the housing used to fix the pins needs to be locally thickened. However, this makes the housing manufacturing process more complex, thereby increasing the manufacturing cost of the housing. As a result, the housing has a limited thickness, which makes the pins prone to bending and shaking when plugged into the circuit board, resulting in inaccurate pin positioning and deviations between the pins and the mounting holes on the circuit board. The pin position needs to be corrected multiple times, which can easily damage the housing and / or potting compound, causing poor insulation. Utility Model Content

[0003] The utility model aims to solve the technical problems existing in the prior art and provides a current transformer. The current transformer further comprises a bracket for fixing a carrier of a pin, which is beneficial to improving the positioning reliability of the pin.

[0004] The technical solution adopted by the utility model to solve the technical problem is: a current transformer, comprising:

[0005] case;

[0006] a bracket, disposed in the housing;

[0007] An electromagnetic component is connected to the bracket, and the electromagnetic component includes a magnetic core winding, a conductor and a plurality of pins. The magnetic core winding is arranged in the shell, and the magnetic core winding includes a magnetic core and a coil. The coil is wound on the magnetic core and connected to the pin. A portion of the conductor is located in the shell and passes through the magnetic core, and the rest of the conductor is located outside the shell. A portion of the pin is located in the shell and inserted into the bracket to fix the pin and the bracket. The coil is connected to the pin, and the rest of the pin is located outside the shell.

[0008] In some embodiments, the electromagnetic components are provided in multiple groups.

[0009] In some embodiments, the bracket is provided in plurality, and each bracket is detachably connected;

[0010] The plurality of brackets and the plurality of groups of electromagnetic components are connected in a one-to-one correspondence.

[0011] In some embodiments, the stent includes a support and a support connected to one end of the support in the axial direction;

[0012] The magnetic core winding is sleeved on the pillar in a clearance fit, and one end of the magnetic core winding in the axial direction contacts the support;

[0013] A portion of the conductor located in the housing is inserted into the support;

[0014] A portion of the pin located in the housing is inserted into the support.

[0015] In some embodiments, the support includes a supporting portion and a thickened portion;

[0016] The average thickness of the thickened portion is greater than the average thickness of the support portion;

[0017] The support portion is connected to one end of the support in the axial direction;

[0018] A portion of the pin located inside the housing is inserted into the thickened portion.

[0019] In some embodiments, the conductor includes two plug-in sections spaced side by side and a connecting section connected between the two plug-in sections;

[0020] A clearance groove is provided on the side of the support facing away from the pillar;

[0021] The connecting section is arranged in the housing and in the clearance groove;

[0022] A portion of one of the plug-in sections located inside the housing is inserted on the support, and the remaining portion is located outside the housing;

[0023] A portion of the other plug-in section located inside the housing is arranged outside the magnetic core winding in a radial direction, and the remaining portion is located outside the housing;

[0024] The parts of the two plug-in sections located outside the shell and the parts of the plurality of pins located outside the shell are all located on the same side of the shell.

[0025] In some embodiments, the connecting section and the relief groove are in interference fit.

[0026] In some embodiments, the support further comprises a retaining wall;

[0027] The retaining wall is connected to the side of the support facing the pillar;

[0028] The retaining wall is provided between the magnetic core winding and the other plug-in section;

[0029] The magnetic core winding is gap-fitted between the retaining wall and the support column.

[0030] In some embodiments, the support is provided with a cable tie groove;

[0031] The lead-out section of the coil for connecting to the pin is arranged in the wiring trough.

[0032] In some embodiments, in the axial direction of the pillar, the electromagnetic assembly is provided with two groups, namely a first electromagnetic assembly and a second electromagnetic assembly, and the bracket is provided with two groups, namely a first bracket and a second bracket, the first electromagnetic assembly corresponds to the first bracket, and the second electromagnetic assembly corresponds to the second electromagnetic assembly;

[0033] In the first electromagnetic assembly, the first bracket further includes a plug post, and the support of the first bracket is connected to one end of the plug post in the axial direction and is located between the support column of the first bracket and the plug post;

[0034] In the second electromagnetic assembly, a socket is provided in the support column of the second bracket;

[0035] The plug is inserted into the socket in an interference fit manner;

[0036] The plug-in section in the second electromagnetic assembly is further inserted into the support column in the first bracket.

[0037] In some embodiments, a gap exists between the magnetic core winding in the second electromagnetic assembly and the support of the first bracket.

[0038] In some embodiments, a first support column is provided on the side of the support of the first bracket facing away from the pillar, and the first support column supports the magnetic core winding in the second electromagnetic component; a second support column is provided on the end of the pillar of the second bracket facing away from the support of the second bracket, and the second support column is inserted into a slot corresponding to the support of the first bracket.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] The utility model adopts a bracket as the core carrier of the electromagnetic component. Compared with the shell, the bracket is smaller in size and has a more flexible structural design. Therefore, it is convenient to make the part of the bracket used for inserting the pins thicker, so that the pins are fixed more firmly. The pins are not prone to bending or shaking when inserted into the mounting holes on the circuit board, thereby improving the installation efficiency of the pins.

[0041] In addition, the electromagnetic component is connected to the bracket to form an integral structure, which can be placed in the shell as a whole and injected with glue to complete the assembly of the current transformer, thereby improving assembly efficiency.

[0042] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the current transformer of the present invention is not limited to the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is a schematic diagram of the structure of the first electromagnetic component and the first bracket in the combined state of the present invention. Figure 1 ;

[0044] Figure 2 This is a schematic diagram of the structure of the first electromagnetic component and the first bracket in the combined state of the present invention. Figure 2 ;

[0045] Figure 3 This is a schematic diagram of the structure of the second electromagnetic component and the second bracket in the combined state of the utility model. Figure 1 ;

[0046] Figure 4 This is a schematic diagram of the structure of the second electromagnetic component and the second bracket in the combined state of the utility model. Figure 2 ;

[0047] Figure 5 This is a schematic diagram of the structure of the utility model Figure 1 (excluding the shell);

[0048] Figure 6 This is a schematic diagram of the structure of the utility model Figure 2 (excluding the shell);

[0049] Figure 7 It is a schematic diagram of the combination of two electromagnetic components of the utility model;

[0050] Figure 8 This is a schematic diagram of the structure of the electromagnetic component and the bracket being combined and installed in the housing of the utility model;

[0051] Figure 9 This is a schematic diagram of the structure of the shell of the utility model after being filled with potting glue;

[0052] Figure 10 This is another structural diagram of the utility model;

[0053] In the figure, 1. first magnetic core winding; 2. first conductor; 21. one of the plug-in sections; 22. another plug-in section; 23. connecting section; 3. first pin; 4. first bracket; 41. first support; 411. wiring groove; 412. retaining wall; 413. clearance hole; 414. plug-in column; 415. slot; 416. first support column; 417. clearance groove; 42. first pillar; 421. through hole; 5. second magnetic core winding; 6. second conductor; 7. second pin; 8. second bracket; 81. second support; 82. second pillar; 821. plug-in hole; 822. second support column; 9. shell; 91. opening; 10. potting compound. DETAILED DESCRIPTION

[0054] In the present invention, the terms "first" and "second" are only used to distinguish similar objects, rather than to describe a specific order or precedence, and should not be understood as indicating or implying relative importance. In the description, the use of "upper", "lower", "inner", "outer", "top / bottom" and other indications of orientation or positional relationships is based on the orientation or positional relationships shown in the accompanying drawings and is only for the convenience of describing the present invention, rather than indicating or implying that the device referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present invention. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0055] In addition, in the description of the present invention, unless otherwise specified, "multiple / groups" refers to two / groups or more than two / groups. In the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "setting", "connection", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be a direct connection or an indirect connection through an intermediate medium. It can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] See Figures 1-9 As shown, a current transformer of the present invention includes a housing 9, a bracket, and an electromagnetic assembly. The bracket is disposed within the housing 9, and the electromagnetic assembly is connected to the bracket. The electromagnetic assembly specifically includes a magnetic core winding, a conductor, and a plurality of pins. The magnetic core winding is disposed within the housing 9, and includes a magnetic core and a coil. The coil is wound around the magnetic core and connected to the pins. A portion of the conductor is disposed within the housing 9 and passes through the magnetic core, while the remaining portion of the conductor is disposed outside the housing 9. A portion of the pin is disposed within the housing 9 and inserted into the bracket to secure the pin and the bracket, thereby making the pin connection more secure. The coil is connected to the pin, and the remaining portion of the pin is disposed outside the housing 9.

[0057] In this embodiment, multiple sets of electromagnetic assemblies are provided, and multiple brackets are provided, each of which is detachably connected. The multiple brackets are connected to the multiple sets of electromagnetic assemblies in a one-to-one correspondence. That is, the brackets are split, and each electromagnetic assembly is attached to a corresponding bracket, and then the multiple brackets are assembled. In other embodiments, a single bracket is provided, and the bracket is injection molded to encapsulate the multiple sets of electromagnetic assemblies.

[0058] Specifically, this embodiment illustrates two sets of electromagnetic assemblies and two brackets, but the number of electromagnetic assemblies and brackets is not limited to this. The two sets of electromagnetic assemblies are a first electromagnetic assembly and a second electromagnetic assembly, and the two brackets are a first bracket 4 and a second bracket 8. The first electromagnetic assembly corresponds to the first bracket 4, and the second electromagnetic assembly corresponds to the second electromagnetic assembly. The first electromagnetic assembly includes a first magnetic core winding 1, a first conductor 2, and a plurality of first pins 3. The second electromagnetic assembly includes a second magnetic core winding 5, a second conductor 6, and a plurality of second pins 7. The first conductor 2 and the second conductor 6 are each made of copper. Therefore, the present invention constitutes a combined current transformer. The following uses the first electromagnetic assembly and the first bracket 4 as an example to further illustrate the connection relationship between the first electromagnetic assembly and the first bracket 4.

[0059] like Figure 1 、 Figure 2 As shown, the first bracket 4 includes a first support 42 and a first support 41 connected to one axial end of the first support 42. The first magnetic core winding 1 is loosely mounted on the first support 42, with one axial end of the first magnetic core winding 1 contacting the first support 41. The portion of the first conductor 2 located within the housing 9 is inserted into the first support 42, and the portion of the first pin 3 located within the housing 9 is inserted into the first support 41. This secures the first conductor 2 to the first support 42 and the first pin 3 to the first support 41. Although the first magnetic core winding 1 and the first support 42 have a loose fit, the end face of the first magnetic core winding 1 contacts the first support 41, providing support. This allows the first electromagnetic assembly and the first bracket 4 to be lifted and placed into the housing 9. In some embodiments, the first support 41 includes a supporting portion and a thickened portion, with the average thickness of the thickened portion being greater than the average thickness of the supporting portion. The supporting portion is connected to one axial end of the first support 42. The portion of the first pin 3 located within the housing 9 is inserted into the thickened portion, ensuring a more secure connection for the first pin 3.

[0060] In this embodiment, the first conductor 2 includes two spaced-apart plug-in sections 21 and 22 arranged side by side, and a connecting section 23 connecting the two plug-in sections 21 and 22, resulting in a generally U-shaped first conductor 2. A clearance groove 417 is provided on the side of the first support 41 facing away from the first support 42. The connecting section 23 of the first conductor 2 is disposed within the housing 9 and within the clearance groove 417. This allows the connecting section 23 to be concealed within the clearance groove 417, making the overall structure more compact and miniaturized. In particular, the connecting section 23 forms an interference fit with the clearance groove 417, providing a more secure connection between the first conductor 2 and the first support 4, further facilitating the lifting of the first support 4 and the first electromagnetic assembly as a whole into the housing 9.

[0061] One of the insertion sections 21 of the first conductor 2, located within the housing 9, is partially inserted onto the first support 42, while the remaining portion is located outside the housing 9. Another insertion section 22 of the first conductor 2, located within the housing 9, is partially positioned radially outward of the first magnetic core winding 1, while the remaining portion is located outside the housing 9. The portions of the two insertion sections 21 and 22 of the first conductor 2 located outside the housing 9 and the portions of the plurality of first pins 3 located outside the housing 9 are all located on the same side of the housing 9, and thus can be simultaneously plugged into the same circuit board.

[0062] In this embodiment, the first bracket 4 further includes a retaining wall 412, which is connected to the side of the first support 41 facing the first support 42 and is disposed between the first magnetic core winding 1 and the other plug-in section 22. The retaining wall 412 prevents the first magnetic core winding 1 from approaching the other plug-in section 22 of the first conductor 2, thereby preventing a contact short circuit and increasing the creepage distance between the coil of the first magnetic core winding 11 and the first conductor 2. The first magnetic core winding 1 is loosely fitted between the retaining wall 412 and the first support 42, thereby reducing friction between the coil of the first magnetic core winding 1 and the retaining wall 412 and / or the first support 42.

[0063] In this embodiment, a wire harness groove 411 is provided on the first support 41 , and a lead-out section of the coil on the first magnetic core winding 1 for connecting to the first pin 3 is provided in the wire harness groove 411 .

[0064] like Figure 3 、 Figure 4 As shown, the second bracket 8 includes a second support 81 and a second support 82 provided on the second support 81. The second bracket 8 is used to install the second electromagnetic component. The structure of the second bracket 8 is consistent or basically consistent with the structure of the first bracket 4. The combination of the second bracket 8 and the second electromagnetic component is consistent or basically consistent with the combination of the first bracket 4 and the first electromagnetic component. Therefore, the connection method of the second bracket 8 and the second electromagnetic component is as described above and will not be repeated here.

[0065] In this embodiment, the first bracket 4 and the second bracket 8 are arranged along the axial direction of the first support 42 of the first bracket 4. The first bracket 4 also includes a post 414. The first support 41 of the first bracket 4 is connected to one axial end of the post 414 and is located between the first support 42 of the first bracket 4 and the post 414. The second support 82 of the second bracket 8 has a socket 821 defined therein, and the post 414 is inserted into the socket 821 with an interference fit. The cross-section of the post 414 is generally I-shaped, and there are two sockets 821, which are arranged opposite each other on the inner side of the second support 82. The two sides of the post 414 are respectively inserted into the two sockets 821.

[0066] One of the plug-in sections of the second conductor 6 in the second electromagnetic component is also inserted into the through hole 421 provided in the first pillar 42 in the first bracket 4. Therefore, the first electromagnetic component is a zero-sequence mutual inductor, which includes four first pins 3, of which two first pins 3 are zero-sequence pins, corresponding to the zero-sequence coil winding on the first magnetic core winding 1, and the remaining two first pins 3 are self-test pins, corresponding to the self-test coil winding on the first magnetic core winding 1. The second electromagnetic component is a current mutual inductor, which includes two second pins 7. Therefore, the present invention includes a total of six pins. In other embodiments, both electromagnetic components are current mutual inductors. Therefore, the present invention includes two first pins 3 and two second pins 7, a total of four pins, such as Figure 10 Each second pin 7 on the second bracket 8 passes through the corresponding clearance hole 413 on the first support 41, so that the plurality of second pins 7 and the plurality of first pins 3 are arranged in a straight line.

[0067] In this embodiment, there is a gap between the first magnetic core winding 1 in the second electromagnetic assembly and the first support 41 of the first bracket 4, which can increase the creepage distance between the first magnetic core winding 1 and the second magnetic core winding 5. In particular, a first support column 416 is provided on the side of the first support 41 of the first bracket 4 facing away from the first pillar 42. The first support column 416 supports the second magnetic core winding 5 in the second electromagnetic assembly. Figure 6 As shown. The number of the first support columns 416 is specifically two, and the two first support columns 416 are located on opposite sides of the plug column 414. A second support column 822 is provided at one end of the second support column 82 of the second bracket 8 facing away from the second support 81 of the second bracket 8. The second support column 822 is inserted into the corresponding slot 415 provided on the side of the first support 41 of the first bracket 4 facing away from the first support 41, as shown. Figure 2 、 Figure 3 shown.

[0068] In this embodiment, an opening 91 is provided at one end of the housing 9. After each electromagnetic assembly is assembled with a corresponding bracket, it is installed into the housing 9 through the opening 91 of the housing 9. The housing 9 is filled with a potting compound 10. The potting compound 10 covers each magnetic core winding and each bracket. Only the free ends of the two plug-in sections of the first conductor 2, the free ends of the two plug-in sections of the second conductor 6, the free ends of each first pin 3, and the free ends of each second pin 7 are exposed outside the potting compound 10 and extend out of the opening 91 of the housing 9. Figure 9 shown.

[0069] The working principle of the current transformer of the present invention is as follows:

[0070] The detection principle of the second electromagnetic assembly: The two ends of the second conductor 6 are connected to the single-phase current to be measured, and the two second pins 7 are connected to the first ammeter. It should be noted that this is not a direct connection. Instead, the two ends of the second conductor 6 and the two second pins 7 are respectively plugged into the circuit board, indirectly connecting the single-phase current to be measured and the first ammeter. The second conductor 6 is wrapped around the magnetic ring of the second magnetic core winding 5 once, and the coil on the second magnetic core winding 5 is wrapped around the magnetic ring for N1 turns. The alternating current passing through the second conductor 6 generates a changing magnetic field in the second magnetic core winding 5. The changing magnetic field induces a small current in the second magnetic core winding 5 equivalent to the single-phase current to be measured / N1.

[0071] The detection principle of the first electromagnetic assembly: The two ends of the first conductor 2 are connected to the two-phase current to be measured, and the two zero-sequence pins are connected to the second ammeter. It should be noted that this connection is not direct. Instead, the two ends of the first conductor 2 and the two zero-sequence pins are plugged into the circuit board, indirectly connecting the two-phase current to be measured and the second ammeter. Under normal conditions, the vector sum of the single-phase current and the two-phase current is zero, so the reading of the second ammeter tends to zero under normal conditions. However, if a fault such as a ground fault occurs in the single-phase current and the two-phase current, the vector sum of the two currents is non-zero, and the reading of the second ammeter changes.

[0072] The self-test principle of the first electromagnetic component: its two self-test pins are connected to the detection ammeter, and the two zero-sequence pins are connected to the external current. The number of turns of the self-test coil winding is different from the number of turns of the zero-sequence coil winding. An induced current is generated on the self-test coil winding, and the detection ammeter produces a reading, thereby detecting whether the zero-sequence transformer can work normally.

[0073] The present invention provides a current transformer that uses a bracket instead of a housing 9 as a carrier for the electromagnetic assembly. Because the bracket is smaller and more flexible than the housing 9, the portion of the bracket where the pins are inserted can be made thicker, thereby securing the pins more securely. This reduces bending and shaking when the pins are inserted into mounting holes on a circuit board, improving pin installation efficiency. The present invention utilizes a single housing 9 to house multiple electromagnetic assemblies, forming a modular current transformer. This simplifies the manufacturing process, improves assembly efficiency and overall structural strength, and reduces the material and processing costs of the transformer.

[0074] The utility model provides a current transformer, and the parts not involved are the same as those in the prior art or can be implemented by using the prior art.

[0075] The above embodiments are only used to further illustrate a current transformer of the present invention, but the present invention is not limited to the embodiments. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention fall within the protection scope of the technical solution of the present invention.

Claims

1. A current transformer, characterized in that: include: case; a bracket, disposed in the housing; An electromagnetic component is connected to the bracket, and the electromagnetic component includes a magnetic core winding, a conductor and a plurality of pins. The magnetic core winding is arranged in the shell, and the magnetic core winding includes a magnetic core and a coil. The coil is wound on the magnetic core and connected to the pin. A portion of the conductor is located in the shell and passes through the magnetic core, and the rest of the conductor is located outside the shell. A portion of the pin is located in the shell and inserted into the bracket to fix the pin and the bracket. The coil is connected to the pin, and the rest of the pin is located outside the shell.

2. The current transformer according to claim 1, characterized in that: The electromagnetic components are provided in multiple groups.

3. The current transformer according to claim 2, characterized in that: There are multiple brackets, and each bracket is detachably connected; The plurality of brackets and the plurality of groups of electromagnetic components are connected in a one-to-one correspondence.

4. The current transformer according to claim 1, characterized in that: The bracket includes a pillar and a support connected to one end of the pillar in the axial direction; The magnetic core winding is sleeved on the pillar in a clearance fit, and one end of the magnetic core winding in the axial direction contacts the support; A portion of the conductor located in the housing is inserted into the support; A portion of the pin located in the housing is inserted into the support.

5. The current transformer according to claim 4, characterized in that: The support includes a supporting portion and a thickened portion; The average thickness of the thickened portion is greater than the average thickness of the support portion; The support portion is connected to one end of the support in the axial direction; A portion of the pin located inside the housing is inserted into the thickened portion.

6. The current transformer according to claim 4, characterized in that: The conductor includes two plug-in sections spaced side by side and a connecting section connected between the two plug-in sections; A clearance groove is provided on the side of the support facing away from the pillar; The connecting section is arranged in the housing and in the clearance groove; A portion of one of the plug-in sections located inside the housing is inserted on the support, and the remaining portion is located outside the housing; A portion of the other plug-in section located inside the housing is arranged outside the magnetic core winding in a radial direction, and the remaining portion is located outside the housing; The parts of the two plug-in sections located outside the shell and the parts of the plurality of pins located outside the shell are all located on the same side of the shell.

7. The current transformer according to claim 6, characterized in that: The connecting section and the relief groove are in interference fit.

8. The current transformer according to claim 6, characterized in that: The support also includes a retaining wall; The retaining wall is connected to the side of the support facing the pillar; The retaining wall is provided between the magnetic core winding and the other plug-in section; The magnetic core winding is gap-fitted between the retaining wall and the support column.

9. The current transformer according to claim 4, characterized in that: The support is provided with a cable duct; The lead-out section of the coil for connecting to the pin is arranged in the wiring trough.

10. The current transformer according to claim 6, characterized in that: In the axial direction of the pillar, the electromagnetic assembly is provided with two groups, namely the first electromagnetic assembly and the second electromagnetic assembly, and the bracket is provided with two groups, namely the first bracket and the second bracket, the first electromagnetic assembly corresponds to the first bracket, and the second electromagnetic assembly corresponds to the second electromagnetic assembly; In the first electromagnetic assembly, the first bracket further includes a plug post, and the support of the first bracket is connected to one end of the plug post in the axial direction and is located between the support column of the first bracket and the plug post; In the second electromagnetic assembly, a socket is provided in the support column of the second bracket; The plug is inserted into the socket in an interference fit manner; The plug-in section in the second electromagnetic assembly is further inserted into the support column in the first bracket.

11. The current transformer according to claim 10, characterized in that: There is a gap between the magnetic core winding in the second electromagnetic component and the support of the first bracket.

12. The current transformer according to claim 11, characterized in that: A first support column is provided on the side of the support of the first bracket facing away from the pillar, and the first support column supports the magnetic core winding in the second electromagnetic component; a second support column is provided on one end of the pillar of the second bracket facing away from the support of the second bracket, and the second support column is inserted into the slot corresponding to the support of the first bracket.

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