Current transformer

Abstract

The embodiment of the present application discloses a current transformer, which comprises a first shell, a first magnetic core, a second shell, a second magnetic core and an induction coil. The first shell has a holding part. The first magnetic core is at least partially arranged in the first shell and connected with the first shell. The second shell is slidingly connected with the first shell and has a knob arranged on the outer surface of the second shell. The knob is used to drive the second shell to move relative to the first shell. The second magnetic core is at least partially arranged in the second shell and connected with the second shell. The induction coil is wound on at least one of the first magnetic core and the second magnetic core. When the second shell is located at the first position, the first magnetic core and the second magnetic core form a closed ring structure. When the second shell is located at the second position, the first magnetic core and the second magnetic core are separated from each other.

Description

Technical Field

[0001] This application relates to the field of current transformers, and more particularly to a current transformer. Background Technology

[0002] Current transformers (CTs) are mainly used to convert primary current into secondary current proportionally, achieving current isolation and proportional transformation to facilitate measurement, monitoring, and protection of circuits, while ensuring the safety of measuring equipment and operators.

[0003] Current transformers come in two types: fixed and rotary-opening. Fixed current transformers require the cables to be disconnected from power during installation, which is inconvenient for applications with high power continuity requirements. Rotary-opening current transformers can be directly clipped onto the cables without requiring power disconnection during installation. However, rotary-opening current transformers require one hand to hold the casing in place while the other hand rotates the switch, meaning both hands are needed for operation, which is inconvenient when operating at heights or in confined spaces. Utility Model Content

[0004] This application provides a current transformer that can improve the technical problem that rotary openable current transformers require two-hand operation.

[0005] This application provides a current transformer, which includes a first housing, a first magnetic core, a second housing, a second magnetic core, and an induction coil. The first housing has a gripping portion, and the first magnetic core is at least partially disposed within and connected to the first housing. The second housing is slidably connected to the first housing and has a toggle portion disposed on the outer surface of the second housing, the toggle portion being used to drive the second housing to move relative to the first housing. The second magnetic core is at least partially disposed within and connected to the second housing. The induction coil is wound around at least one of the first magnetic core and the second magnetic core. The second housing moves relative to the first housing and has a first position and a second position. When the second housing is in the first position, the first magnetic core and the second magnetic core form a closed ring structure. When the second housing is in the second position, the first magnetic core and the second magnetic core are separated from each other. The proportion of the first magnetic core in the ring structure is different from the proportion of the second magnetic core in the ring structure.

[0006] Beneficial effects: Since the second housing is slidably connected to the first housing, the current transformer can be opened and closed in a sliding manner. When installing the current transformer, the user can hold the grip part of the first housing with one hand and use the thumb to push and pull the lever part, so that the current transformer can switch between the open and closed states. In other words, the user can open and close the current transformer with one hand, thereby improving the efficiency of operation at high altitudes or in confined spaces. Attached Figure Description

[0007] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0008] Figure 1 This is a schematic diagram of the structure of a current transformer in one embodiment of this application; Figure 2 This is a front view of a current transformer in one embodiment of this application. Figure 3 This is a front view of a current transformer according to another embodiment of this application. Figure 4 This is a schematic diagram of the internal structure of a current transformer in one embodiment of this application; Figure 5 This is a schematic diagram of the internal structure of a current transformer in another embodiment of this application; Figure 6 This is a schematic cross-sectional view of a current transformer in one embodiment of this application. Figure 7 for Figure 6 Enlarged view of point A in the middle; Figure 8 This is a schematic diagram of the internal structure of a current transformer in another embodiment of this application; Figure 9 This is a schematic diagram of the internal structure of a current transformer in another embodiment of this application; Figure 10 This is a schematic diagram of the internal structure of a current transformer in another embodiment of this application.

[0009] Explanation of reference numerals in the attached drawings: 100, current transformer; 100a, opening; 110, first housing; 110a, first groove; 110b, insertion groove; 111, gripping part; 112, second sliding part; 120, first magnetic core; 121, first end face; 122, second end face; 130, second housing; 131, actuating part; 132, sliding member; 132a, second groove; 1321, main body; 1322, first sliding part; 140, second magnetic core; 141, third end face; 142, fourth end face; 150, limiting member; 160, first elastic member; 170, insertion member; 180, induction coil; 181, first coil; 182, second coil; XX, first direction; Y, second direction. Detailed Implementation

[0010] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0011] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0012] Furthermore, the use of terms such as "first," "second," etc., in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0013] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0014] Furthermore, the technical solutions of the various embodiments of this application can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this application.

[0015] like Figure 1-5 As shown, this application embodiment provides a current transformer 100, which includes a first housing 110, a first magnetic core 120, a second housing 130, a second magnetic core 140, and an induction coil 180.

[0016] The first housing 110 has a grip 111 for easy hand gripping, allowing the user to hold and handle the current transformer 100. The grip 111 is sized to fit an adult's hand, ensuring comfort for most users and optimizing the user experience. The first housing 110 can be made of plastic, resulting in a lightweight, low-cost, and easy-to-process material. It can be injection molded into various complex shapes and provides insulation.

[0017] The first magnetic core 120 is at least partially disposed within the first housing 110, meaning it can be completely housed within the first housing 110, providing good protection for the first magnetic core 120. Alternatively, the first magnetic core 120 can be partially exposed outside the first housing 110, allowing for better and tighter bonding with the second magnetic core 140. The first magnetic core 120 and the first housing 110 can be fixedly connected, ensuring no relative movement between them. This results in high fitting accuracy when the first magnetic core 120 and the second magnetic core 140 are mated, which is beneficial for improving the measurement accuracy of the current transformer 100. The connection method between the first magnetic core 120 and the first housing 110 can be, for example, screwed, snap-fitted, bonded, welded, or integrally injection molded, and is not limited thereto. The first magnetic core 120 is a sintered magnetic metal oxide composed of an iron oxide mixture; for example, manganese-zinc ferrite has high permeability and high magnetic flux density, and low loss characteristics. Nickel-zinc ferrites possess characteristics such as extremely high impedance and low permeability. Ferrite cores are used in coils and transformers in various electronic devices.

[0018] The second magnetic core 140 is at least partially disposed within the second housing 130, meaning it can be completely disposed within the second housing 130, providing good protection for the second magnetic core 140. Alternatively, the second magnetic core 140 can be partially exposed outside the second housing 130, allowing for a better and tighter connection. The second magnetic core 140 and the second housing 130 can be fixedly connected, ensuring no relative movement between them. This results in a high degree of fit between the first magnetic core 120 and the second magnetic core 140 when they are closed, which is beneficial for improving the measurement accuracy of the current transformer 100. The connection method between the second magnetic core 140 and the second housing 130 can be, for example, screwed, snap-fitted, bonded, welded, or integrally injection molded, and is not limited here. The second magnetic core 140 is a sintered magnetic metal oxide composed of an iron oxide mixture, specifically similar to the first magnetic core 120, and will not be described in detail here.

[0019] The induction coil 180 is wound on at least one of the first magnetic core 181 and the second magnetic core 182.

[0020] The second housing 130 can be made of plastic, making it lightweight, low-cost, and easy to process. It can be injection molded into various complex shapes and provides insulation. The second housing 130 is slidably connected to the first housing 110 via a groove, rod, or other means. The second housing 130 has a toggle part 131 on its outer surface, which drives the second housing 130 to move relative to the first housing 110. When the user holds the gripping part 111 of the first housing 110, they can push and pull the toggle part 131 with their thumb to move the second housing 130. The movement of the second housing 130 will cause the second magnetic core 140 to move synchronously. The toggle part 131 can protrude from the second housing 130 for easier application of force. Alternatively, the second housing 130 can have anti-slip stripes, which serve as the toggle part 131, resulting in a smoother profile.

[0021] The second housing 130 moves relative to the first housing 110 and has a first position and a second position, such as Figure 4 As shown, when the second housing 130 is in the first position, the first magnetic core 120 and the second magnetic core 140 form a closed ring structure, thereby forming a closed magnetic circuit. This allows the magnetic field to circulate within the ring structure, reducing magnetic leakage and energy loss. The ring structure can be circular, square, or elliptical. Figure 5 As shown, when the second housing 130 is in the second position, there is an opening 100a between the first magnetic core 120 and the second magnetic core 140. The wire passes through the opening 100a to enter the interior of the annular structure, which facilitates the installation of the current transformer 100.

[0022] Because the second housing 130 is slidably connected to the first housing 110, meaning the current transformer 100 can be opened and closed in a sliding manner, when installing the current transformer 100, the user can hold the grip portion 111 of the first housing 110 with one hand and use their thumb to push and pull the actuating portion 131, allowing the current transformer 100 to switch between open and closed states. This means the user can open and close the current transformer 100 with one hand, improving work efficiency at heights or in confined spaces. Since the other hand is freed up, the difficulty and danger during operation are also reduced.

[0023] Furthermore, because the current transformer 100 can be opened and closed, its installation in operating distribution cabinets, switchgear, or equipment can be done without power outages affecting production or daily life. This eliminates the complex procedures of power outage, disconnection, wiring, and power restoration, shortening installation time and reducing labor costs. It also avoids the safety risks and impacts on power supply reliability that might arise from power outages. In situations with dense wiring, confined spaces, or difficult-to-access wire locations, the openable current transformer 100 can more easily "clamp" the wires in, without the need for laboriously passing the wires through a closed core hole. Similarly, when the current transformer 100 itself needs calibration, maintenance, or replacement, it can be quickly removed without power interruption.

[0024] In some embodiments, the grip portion 111 is provided with an anti-slip component, which can increase the friction between the palm and the grip portion 111, thereby preventing slippage and making it less likely for the current transformer 100 to slip out of the user's hand. The anti-slip component can be, for example, an anti-slip rubber sleeve, an anti-slip texture, etc.

[0025] like Figure 4 and Figure 5 As shown, in some embodiments, the proportion of the first magnetic core 120 in the ring structure is greater than or less than the proportion of the second magnetic core 140 in the ring structure; that is, the first magnetic core 120 and the second magnetic core 140 are of different sizes and are asymmetrically arranged. The smaller core undertakes the main magnetic circuit, while the larger core acts as a magnetic flux buffer. When the primary current increases, the larger core can accommodate more magnetic flux, delaying the overall saturation point. Optionally, the proportion of the first magnetic core 120 in the ring structure and the proportion of the second magnetic core 140 in the ring structure are greater than 1 and less than or equal to 3. Of course, the proportions of the first magnetic core 120 and the second magnetic core 140 can also be other than 1.

[0026] The following explanation uses an example where the proportion of the first magnetic core 120 is greater than that of the second magnetic core 140. The first magnetic core 120 is larger than the second magnetic core 140. The first magnetic core 120 serves as the main magnetic flux path and is made of a high-saturation material, such as silicon steel sheet, with a saturation magnetic flux density > 1.5T. The second magnetic core 140 serves as an auxiliary path in the magnetic circuit and is made of a high-permeability material, such as permalloy. When the current is relatively small, the magnetic flux mainly flows through the small, high-permeability core, reducing the influence of the air gap. When the current is relatively large, the magnetic flux is diverted to the large core, avoiding abrupt errors caused by the saturation of the small core.

[0027] It should be noted that the design of symmetrical magnetic cores requires reserving symmetrical space for the opening and closing mechanism, while the asymmetrical design can concentrate the operating mechanism on the small magnetic core side. That is, by setting the sliding part on the small magnetic core side, no operating space needs to be reserved on the large magnetic core side, thereby reducing the outer contour size of the current transformer 100 and achieving a larger opening and closing within a limited space.

[0028] In addition, since the proportion of the first magnetic core 120 is greater than that of the second magnetic core 140, the second magnetic core 140 is relatively lighter, and the current transformer 100 requires less effort to open and close, making it more convenient for one-handed operation.

[0029] In some embodiments, the first magnetic core 120 is fixedly connected to the first housing 110, and the second magnetic core 140 is fixedly connected to the second housing 130, for example, by means of interference fit, bonding, snap-fit, etc.

[0030] In some embodiments, the first magnetic core 120 is slightly movable within the first housing 110, and the second magnetic core 140 is slightly movable within the second housing 130, to cooperate in achieving the mutual closing or separation of the first magnetic core 120 and the second magnetic core 140. For example, a rotating structure is provided within the first housing 110, allowing the first magnetic core 120 to rotate slightly within the first housing 110, and another rotating structure is provided within the second housing 130, allowing the second magnetic core 140 to rotate slightly within the second housing 130. In another embodiment, the aforementioned rotating structure may not be provided; by adapting the shape of the housing to the shape of the magnetic core, the slight movement of the magnetic core within the housing can also be achieved.

[0031] When the first magnetic core 120 and the second magnetic core 140 press against each other, the first magnetic core 120 and the second magnetic core 140 can automatically adjust their positions according to the force applied, so that the ends of the first magnetic core 120 and the second magnetic core 140 remain in close contact.

[0032] like Figure 6 and Figure 7 As shown, in some embodiments, one of the first housing 110 and the second housing 130 is provided with a first sliding groove 110a, and the other of the first housing 110 and the second housing 130 is provided with a sliding member 132. The sliding member 132 includes a main body 1321 and a first sliding part 1322. The main body 1321 is connected to the first housing 110 or the second housing 130, and the first sliding part 1322 is connected to the main body 1321 and is disposed within the first sliding groove 110a. The sliding part 1322 slides in conjunction with the first sliding groove 110a, which can limit the sliding direction of the second housing 130, improve the sliding accuracy of the second housing 130, and make the fitting accuracy of the second magnetic core 140 and the first magnetic core 120 better, reducing the air gap at the joint of the second magnetic core 140 and the first magnetic core 120. The number of sliding members 132 can be one or more.

[0033] like Figure 6 and Figure 7As shown, in some embodiments, a second sliding groove 132a is provided on the main body 1321. The first sliding groove 110a and the second sliding groove 132a extend in the same direction. One of the first housing 110 and the second housing 130 has a second sliding portion 112, which is slidably disposed within the second sliding groove 132a. The sliding engagement of the second sliding portion 112 and the second sliding groove 132a can limit the sliding direction of the second housing 130, further improving the sliding accuracy of the second housing 130. This results in better contact accuracy between the second magnetic core 140 and the first magnetic core 120, reducing the air gap at the junction of the second magnetic core 140 and the first magnetic core 120. The first sliding groove 110a and the second sliding groove 132a together limit the sliding direction of the second housing 130. In addition, the second sliding groove 132a is provided on the main body 1321, which can make full use of the internal space of the first housing 110.

[0034] like Figure 8 and Figure 9 As shown, in some embodiments, the first magnetic core 120 has a first end face 121 and a second end face 122, and the second magnetic core 140 has a third end face 141 that mates with the first end face 121 and a fourth end face 142 that mates with the second end face 122. The first end face 121 is used to abut against the third end face 141, and the second end face 122 is used to abut against the fourth end face 142. Generally, the first end face 121 and the third end face 141 are parallel, and the second end face 122 and the fourth end face 142 are parallel, thereby achieving a better fit. The first end face 121 and the second end face 122 can be on the same plane or on different planes. The first end face 121 and the second end face 122 can be arranged parallel or at an angle; this embodiment does not impose any limitations. The angle between the first end face 121 and the horizontal plane can be 0°-90°, and the angle between the second end face 122 and the horizontal plane can be 0°-90°.

[0035] like Figure 8 and Figure 9As shown, in some embodiments, the second housing 130 slides relative to the first housing 110 along a first direction XX, and both the first end face 121 and the second end face 122 are set at an angle to the first direction XX. The angle between the first end face 121 and the first direction XX is greater than 0 degrees and less than or equal to 90 degrees, and the angle between the third end face 141 and the first direction XX is greater than 0 degrees and less than or equal to 90 degrees. When the first housing 110 is in the first position, the first end face 121 and the third end face 141 abut against each other. When the first housing 110 is in the second position, the first end face 121 and the third end face 141 are spaced apart, and the gap between the first end face 121 and the second end face 122 forms an opening 100a. Optionally, both the first end face 121 and the second end face 122 are perpendicular to the first direction XX. The sliding distance of the second housing 130 is the same as the size of the opening 100a. The sliding distance of the second housing 130 can be completely converted into the opening and closing distance of the current transformer 100, resulting in high opening and closing efficiency. This minimizes the sliding distance of the second housing 130 and facilitates user operation.

[0036] In some embodiments, the sliding distance of the first housing 110 relative to the second housing 130 is greater than zero and less than or equal to 22 mm. For example, it can move between 0.5 mm and 22 mm, so that the sliding distance within 22 mm meets the application scenarios of the current transformer 100.

[0037] like Figure 8 and Figure 9 As shown, in some embodiments, the end of the first groove 110a away from the first magnetic core 120 extends along the first direction XX, and the end of the first groove 110a near the first magnetic core 120 bends toward the second direction Y. The second direction Y is set at an angle to the second end face 122 and points toward the second end face 122. Optionally, the second direction Y is perpendicular to the second end face 122 and points toward the second end face 122.

[0038] It is understandable that an air gap inevitably exists at the opening and closing point of the first magnetic core 120 and the second magnetic core 140. The air gap will cause the magnetic reluctance of the magnetic circuit to increase, and the increase in magnetic reluctance will cause the excitation current required to establish the same magnetic flux to increase.

[0039] When the first sliding part 1322 of this embodiment slides toward the end of the first groove 110a near the first magnetic core 120, the first end face 121 abuts against the second end face 122. Since the end of the first groove 110a near the first magnetic core 120 is bent in the second direction Y, the second magnetic core 140 will be subjected to the force of the second direction Y, so that the third end face 141 and the fourth end face 142 can also abut against each other, thereby minimizing the air gap between the first magnetic core 120 and the second magnetic core 140, reducing magnetic resistance, and thus reducing the excitation current.

[0040] like Figure 8 and Figure 9 As shown, in some embodiments, the current transformer 100 further includes a limiting member 150 disposed within the first housing 110 and a first elastic member 160 disposed within the second housing 130. The limiting member 150 can be, for example, a rigid plate, a limiting groove, etc., and the first elastic member 160 can be, for example, an elastic plate, a limiting protrusion, etc. When the second housing 130 is in the first position, the first elastic member 160 abuts against the limiting member 150 to achieve a limiting engagement, thereby allowing the current transformer 100 to remain in a closed state, meaning the current transformer 100 is relatively stable after installation.

[0041] When the user applies force to drive the second housing 130, the first elastic element 160 deforms under external force to release itself from the limiting element 150, allowing the second housing 130 to move from the first position to the second position, thereby enabling the current transformer 100 to open. Of course, the second housing 130 can also move from the second position to the first position, and the first elastic element 160 deforms under external force to release itself from the limiting element 150; that is, the first elastic element 160 requires external force to pass over the limiting element 150.

[0042] In some embodiments, the current transformer 100 further includes a second elastic member disposed within the first housing 110 or the second housing 130, the second elastic member being tractively connected to the second housing 130. The second elastic member may, exemplarily, be a helical spring, a sheet spring, etc.

[0043] When the user applies force to the second housing 130, the second elastic element deforms during the movement of the second housing 130 from the first position to the second position. The force exerted by the second elastic element must be overcome to keep the current transformer 100 in a closed state, meaning the current transformer 100 is relatively stable after installation. When the second housing 130 is in the second position, the second elastic element deforms to provide a restoring force to the second housing 130 when it moves back to the first position. When the user stops applying force, the second housing 130 automatically returns to the first position under the action of the second elastic element. When the second housing 130 is in the first position, the second elastic element may or may not apply a force to the second housing 130.

[0044] like Figure 8 and Figure 9 As shown, in some embodiments, the induction coil 180 includes a first coil 181, which may be wound around a first magnetic core 120 or a second magnetic core 140.

[0045] In some embodiments, the induction coil 180 includes a second coil 182, which may be wound around the first magnetic core 120 or the second magnetic core 140.

[0046] In some embodiments, the induction coil 180 includes a first coil 181 and a second coil 182. The first coil 181 can be used to generate an induced current as a detection coil, and the second coil 182 generates an induced current as a protection coil. The first coil 181 can be wound on a first magnetic core 120, and the second coil 182 can be wound on a second magnetic core 140, thereby providing sufficient space to arrange the first coil 181 and the second coil 182, making the layout of the first coil 181 and the second coil 182 easier.

[0047] In other embodiments, both the first coil 181 and the second coil 182 are wound on the first magnetic core 120, that is, there is no need to wind coils on the second magnetic core 140, which makes it easier for the user to open and close the current transformer 100 when the second magnetic core 140 is moved.

[0048] In other embodiments, both the first coil 181 and the second coil 182 are wound on the second magnetic core 140. The coils are only located on the small magnetic core, which physically isolates the interference of the residual magnetism of the large magnetic core and improves the stability of the initial permeability of the measurement circuit.

[0049] like Figure 10 As shown, in some embodiments, one of the first housing 110 and the second housing 130 is provided with a connector 170, and the other of the first housing 110 and the second housing 130 is provided with a connector groove 110b. When the second housing 130 is in the first position, the connector 170 and the connector groove 110b are engaged to guide the end of the first magnetic core 120 to align with the end of the second magnetic core 140, and to make the connection between the second housing 130 and the first housing 110 more stable, that is, the first magnetic core 120 and the second magnetic core 140 are more stable and have less shaking.

[0050] The connection strength at the opening 100a between the first housing 110 and the second housing 130 is relatively low. Optionally, the plug-in 170 and the plug-in groove 110b are provided at the opening between the first housing 110 and the second housing 130, thereby specifically strengthening the weak points of the first housing 110 and the second housing 130, so that the current transformer 100 can better cope with the vibration environment.

[0051] The above description is merely a preferred embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A current transformer, characterized in that, include: The first housing has a gripping part; A first magnetic core is at least partially disposed within the first housing and connected to the first housing; The second housing is slidably connected to the first housing and has a toggle part disposed on the outer surface of the second housing, the toggle part being used to drive the second housing to move relative to the first housing; The second magnetic core is at least partially disposed within the second housing and connected to the second housing; An induction coil is wound on at least one of the first magnetic core and the second magnetic core; The second housing moves relative to the first housing and has a first position and a second position. When the second housing is in the first position, the first magnetic core and the second magnetic core form a closed ring structure. When the second housing is in the second position, the first magnetic core and the second magnetic core are separated from each other. The proportion of the first magnetic core in the ring structure is different from the proportion of the second magnetic core in the ring structure.

2. The current transformer according to claim 1, characterized in that, The first magnetic core is fixedly connected inside the first housing, and the second magnetic core is fixedly connected inside the second housing; or, When the second housing moves between the first position and the second position, the first magnetic core can move slightly within the first housing, and the second magnetic core can move slightly within the second housing, so as to cooperate in achieving the mutual closing or separation of the first magnetic core and the second magnetic core.

3. The current transformer according to claim 1, characterized in that, One of the first housing and the second housing is provided with a first sliding groove, and the other of the first housing and the second housing is provided with a sliding member. The sliding member includes a main body and a first sliding part. The main body is connected to the first housing or the second housing, and the first sliding part is connected to the main body and is disposed in the first sliding groove.

4. The current transformer according to claim 3, characterized in that, The main body is provided with a second sliding groove, the first sliding groove and the second sliding groove extend in the same direction, one of the first housing and the second housing has a second sliding part, the second sliding part is slidably disposed in the second sliding groove, and the first sliding groove and the second sliding groove together restrict the sliding direction of the second housing.

5. The current transformer according to claim 3, characterized in that, The first magnetic core has a first end face and a second end face, and the second magnetic core has a third end face that mates with the first end face and a fourth end face that mates with the second end face. The first end face is used to abut against the third end face, and the second end face is used to abut against the fourth end face. The end of the first groove away from the first magnetic core extends along a first direction, and the end of the first groove near the first magnetic core bends towards a second direction. The first direction is set at an angle to the first end face, and the second direction is set at an angle to the second end face and points towards the second end face.

6. The current transformer according to claim 1, characterized in that, The current transformer further includes a limiting member disposed within the first housing and a first elastic member disposed within the second housing. When the second housing is in the first position, the first elastic member abuts against the limiting member to achieve a limiting engagement, and the first elastic member can deform under external force to release itself from the limiting member; or... The current transformer further includes a second elastic element disposed within the first housing or the second housing. The second elastic element is kinetically connected to the second housing. When the second housing is in the second position, the second elastic element deforms to give the second housing a restoring force to move to the first position.

7. The current transformer according to claim 1, characterized in that, The ratio of the proportion of the first magnetic core in the ring structure to the proportion of the second magnetic core in the ring structure is greater than 1 and less than or equal to 3; and / or, The sliding range of the second housing relative to the first housing is greater than zero and less than or equal to 22 mm.

8. The current transformer according to claim 1, characterized in that, The first magnetic core has a first end face, the second magnetic core has a third end face that mates with the first end face, and when the second housing is in the second position, the first end face and the third end face are spaced apart and form an opening; The second housing can slide relative to the first housing along a first direction, the angle between the first end face and the first direction is greater than 0 degrees and less than or equal to 90 degrees, and the angle between the third end face and the first direction is greater than 0 degrees and less than or equal to 90 degrees.

9. The current transformer according to claim 1, characterized in that, The induction coil includes a first coil wound around the first magnetic core or the second magnetic core; or... The induction coil includes a second coil wound around the first magnetic core or the second magnetic core; or... The induction coil includes a first coil and a second coil. The first coil is wound on one of the first magnetic core and the second magnetic core, and the second coil is wound on the other of the first magnetic core and the second magnetic core. Alternatively, both the first coil and the second coil are wound on the first magnetic core, or both the first coil and the second coil are wound on the second magnetic core.

10. The current transformer according to claim 1, characterized in that, One of the first housing and the second housing is provided with a connector, and the other of the first housing and the second housing is provided with a connector groove. When the second housing is in the first position, the connector and the connector groove are engaged to guide the end of the first magnetic core to align with the end of the second magnetic core.

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