Current transformer

Abstract

The invention is suitable for electrical equipment, and provides a current transformer. The current transformer comprises a magnetic component with a penetrating hole; the primary winding is used for being electrically connected with a circuit to be tested and is arranged in the penetrating hole in a penetrating manner; and the secondary winding is used for being electrically connected with a to-be-connected component and is wound on the magnetic component. According to the current transformer, the primary winding is arranged in the penetrating hole in a penetrating mode, through the design, integration of the primary winding and the magnetic component becomes more compact, the overall size of the current transformer is reduced, the current transformer can be conveniently installed and used in the space-limited environment, and the application range of the current transformer is greatly widened; meanwhile, a magnetic field generated by the magnetic component is effectively utilized, and the magnetic coupling efficiency between the primary winding and the secondary winding is enhanced; in addition, by means of the design, the air fluidity is improved, the risk that the primary winding is overheated is reduced, and therefore the heat dissipation performance of the current transformer is improved.

Description

Technical Field

[0001] The present application belongs to the technical field of electrical equipment, and more specifically, relates to a current transformer. Background Art

[0002] Current transformer (CT) is an electrical device used to measure and monitor alternating current. Its main function is to convert high current signals into smaller, safely measurable current signals to facilitate monitoring and protection of power systems. However, current transformers in related technologies are generally large in size, which limits their application in environments with limited space. Summary of the invention

[0003] The purpose of the embodiments of the present application is to provide a current transformer, aiming to solve the technical problem of large size of the current transformer in the related art.

[0004] To achieve the above-mentioned purpose, according to one aspect of the present application, a current transformer is provided, comprising: a magnetic component having a through hole; a primary winding, used to be electrically connected to a circuit to be measured and penetrated in the through hole; and a secondary winding, used to be electrically connected to a component to be connected and wound around the magnetic component.

[0005] Optionally, the primary winding includes a penetration portion and a first connecting portion, the penetration portion is penetrated in the penetration hole; the first connecting portion is located outside the penetration hole and connected to the penetration portion for being electrically connected to the circuit to be tested.

[0006] Optionally, the primary winding further includes a second connecting portion, which is located outside the penetration hole and connected to the penetration portion for being electrically connected to the circuit to be tested.

[0007] Optionally, a first preset angle is provided between the length direction of the first connecting part and the length direction of the penetrating part, and the first preset angle is greater than 0° and less than or equal to 90°; and / or a second preset angle is provided between the length direction of the second connecting part and the length direction of the penetrating part, and the second preset angle is greater than 0° and less than or equal to 90°; and / or the second connecting part is arranged in a direction away from the first connecting part; and / or the length direction of the first connecting part is parallel to the length direction of the second connecting part; and / or the first connecting part is connected to the first end of the penetrating part, the second connecting part is connected to the second end of the penetrating part, and the first end of the penetrating part and the second end of the penetrating part are arranged opposite to each other.

[0008] Optionally, the primary winding is made of silver wire.

[0009] Optionally, the magnetic component is a magnetic ring having a center hole, the primary winding is inserted into the center hole, and the center hole is formed as the insertion hole; the secondary winding is spirally wound around the magnetic ring along the circumference of the magnetic ring.

[0010] Optionally, an insulating sleeve is mounted on the primary winding, and at least a portion of the structure of the insulating sleeve is located in the penetration hole.

[0011] Optionally, the secondary winding is an enameled copper wire, the enameled copper wire is made of polyesterimide material, and the temperature resistance grade of the enameled copper wire is 220° C.; and / or the magnetic ring is made of manganese-zinc ferrite material.

[0012] Optionally, the current transformer further includes a mounting base, and the magnetic component is mounted on the mounting base.

[0013] Optionally, the mounting seat has a mounting hole, at least part of the structure of the magnetic component is installed in the mounting hole, and there is a connecting gap between the magnetic component and the hole wall of the mounting hole, the connecting gap is filled with insulating paint, and the magnetic component is installed in the mounting hole through the insulating paint; and / or, the mounting seat is made of high-temperature resistant glass fiber material.

[0014] The beneficial effect of the current transformer provided by the present application is that the primary winding in the present application is inserted into the insertion hole. This design not only makes the integration of the primary winding and the magnetic component more compact, reduces the overall volume of the current transformer, and facilitates the installation and use of the current transformer in a space-constrained environment, greatly broadening the scope of application of the current transformer; at the same time, it also effectively utilizes the magnetic field generated by the magnetic component, and enhances the magnetic coupling efficiency between the primary winding and the secondary winding; in addition, the above design also improves air flow, reduces the risk of overheating of the primary winding, and thus improves the heat dissipation performance of the current transformer. The secondary winding is wound on the magnetic component. This design enables the secondary winding and the primary winding to be effectively combined on the same component, further reducing the overall volume of the current transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0016] Figure 1 A schematic diagram of the structure of a current transformer with hidden insulating paint provided in an embodiment of the present application;

[0017] Figure 2 A schematic diagram of the structure of a current transformer with hidden insulating paint and insulating sleeve provided in an embodiment of the present application;

[0018] Figure 3 A front view schematic diagram of a current transformer with hidden insulating paint provided in an embodiment of the present application;

[0019] Figure 4 A schematic diagram of the structure of the primary winding provided in an embodiment of the present application;

[0020] The reference numerals in the above drawings are as follows:

[0021] 100, magnetic component; 110, penetration hole; 200, primary winding; 210, penetration portion; 220, first connecting portion; 230, second connecting portion; 300, secondary winding; 310, secondary loop wire; 400, insulating sleeve; 500, mounting seat; 510, mounting hole; 520, mounting through hole. DETAILED DESCRIPTION

[0022] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0023] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or indirectly connected to the other element. In the absence of conflict, the embodiments in this application and the features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0024] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0026] As described in the background technology, a current transformer (full name: Current Transformer, English abbreviation: CT) is an electrical device used to measure and monitor alternating current. Its main function is to convert high current signals into smaller, safely measurable current signals to facilitate monitoring and protection of power systems. However, current transformers in related technologies are generally large in size, and this design limits their application in environments with limited space.

[0027] Reference Figures 1 to 4 In order to solve the above problems, according to one aspect of the present application, an embodiment of the present application provides a current transformer, which includes a magnetic component 100, a primary winding 200 and a secondary winding 300, wherein the magnetic component 100 has a penetration hole 110; the primary winding 200 is used to be electrically connected to the circuit to be tested and is penetrated in the penetration hole 110; the secondary winding 300 is used to be electrically connected to the component to be connected and is wound on the magnetic component 100.

[0028] In an embodiment of the present application, the secondary winding 300 is used to be electrically connected to a measuring device (such as an ammeter or a voltmeter) or a protection device (such as a relay), and the measuring device or the protection device is formed as a component to be connected; the magnetic component 100 can be a ferrite core, a silicon steel sheet or an aluminum nickel cobalt core.

[0029] The primary winding 200 in the present application is inserted into the insertion hole 110. This design not only makes the integration of the primary winding 200 and the magnetic component 100 more compact, reduces the overall volume of the current transformer, facilitates the installation and use of the current transformer in a space-constrained environment, and greatly broadens the scope of application of the current transformer; at the same time, it also effectively utilizes the magnetic field generated by the magnetic component 100, enhances the magnetic coupling efficiency between the primary winding 200 and the secondary winding 300; in addition, the above design also improves air flow, reduces the risk of overheating of the primary winding 200, and thus improves the heat dissipation performance of the current transformer. The secondary winding 300 is wound on the magnetic component 100. This design enables the secondary winding 300 and the primary winding 200 to be effectively combined on the same component, further reducing the overall volume of the current transformer.

[0030] Reference Figures 1 to 4In one embodiment, the primary winding 200 includes a penetration portion 210 and a first connecting portion 220, the penetration portion 210 is penetrated in the penetration hole 110; the first connecting portion 220 is located outside the penetration hole 110 and connected to the penetration portion 210, and is used to be electrically connected to the circuit to be tested.

[0031] In this embodiment, the first connection part 220 and the penetration part 210 are an integral part. The first connection part 220 is located outside the penetration hole 110. This design not only facilitates the electrical connection between the first connection part 220 and the circuit to be tested, thereby simplifying the connection and maintenance process, but also reduces the influence of electrical interference and heat in the penetration hole 110 on the first connection part 220, ensuring the stability and accuracy of the signal; in addition, this design also helps the first connection part 220 to better dissipate heat, avoiding the performance and reliability of the current transformer being affected by excessive temperature.

[0032] Reference Figures 1 to 4 In one embodiment, the primary winding 200 further includes a second connecting portion 230, which is located outside the penetration hole 110 and connected to the penetration portion 210 for being electrically connected to the circuit to be tested.

[0033] In this embodiment, the second connection part 230 and the penetration part 210 are an integral part. The second connection part 230 is provided so that the primary winding 200 and the circuit to be tested form a closed loop; at the same time, the second connection part 230 is located outside the penetration hole 110. This design not only facilitates the electrical connection between the second connection part 230 and the circuit to be tested, thereby simplifying the connection and maintenance process, but also reduces the influence of electrical interference and heat in the penetration hole 110 on the second connection part 230, ensuring the stability and accuracy of the signal; in addition, this design also helps the second connection part 230 to dissipate heat better, avoiding the performance and reliability of the current transformer being affected by excessive temperature.

[0034] Reference Figures 1 to 4 In one embodiment, there is a first preset angle between the length direction of the first connecting portion 220 and the length direction of the penetrating portion 210, and the first preset angle is greater than 0° and less than or equal to 90°.

[0035] In this embodiment, the length direction of the penetration portion 210 is parallel to the extension direction of the penetration hole 110, and the first preset angle is 90°; in other embodiments, the first preset angle may also be an acute angle.

[0036] The above design not only helps to reduce the volume of the primary winding 200, thereby reducing the overall volume of the current transformer, so that the current transformer can better adapt to the space-constrained environment and effectively improve the space utilization rate; it can also weaken the bending stress at the connection between the first connecting part 220 and the penetrating part 210, thereby improving the reliability and durability of the connection between the first connecting part 220 and the penetrating part 210, and reducing the risk of damage due to mechanical stress.

[0037] Reference Figures 1 to 4 In one embodiment, there is a second preset angle between the length direction of the second connecting portion 230 and the length direction of the penetrating portion 210, and the second preset angle is greater than 0° and less than or equal to 90°.

[0038] In this embodiment, the length direction of the penetration portion 210 is parallel to the extension direction of the penetration hole 110, and the second preset angle is 90°; in other embodiments, the second preset angle may also be an acute angle.

[0039] The above design not only helps to further reduce the volume of the primary winding 200, thereby reducing the overall volume of the current transformer, enabling the current transformer to better adapt to space-constrained environments and effectively improve space utilization; it can also reduce the bending stress at the connection between the second connecting part 230 and the penetration part 210, thereby improving the reliability and durability of the connection between the second connecting part 230 and the penetration part 210, and reducing the risk of damage due to mechanical stress.

[0040] Reference Figures 1 to 4 In one embodiment, the second connection part 230 is arranged in a direction away from the first connection part 220. The above design not only enables the first connection part 220 and the second connection part 230 to better adapt to different installation environments and improve the flexibility of the overall layout; it also avoids interference between the electrical connection between the first connection part 220 and the circuit to be tested and the electrical connection between the second connection part 230 and the circuit to be tested, thereby improving the connection efficiency; in addition, the above design also reduces the mutual interference between the first connection part 220 and the second connection part 230, thereby ensuring the stability and accuracy of signal transmission.

[0041] Reference Figures 1 to 4 In one embodiment, the length direction of the first connecting portion 220 is parallel to the length direction of the second connecting portion 230. The above design is not only helpful for manufacturing and processing the primary winding 200, but also helps to reduce the volume of the primary winding 200.

[0042] Reference Figures 1 to 4In one embodiment, the first connection part 220 is connected to the first end of the penetration part 210, the second connection part 230 is connected to the second end of the penetration part 210, and the first end of the penetration part 210 is arranged opposite to the second end of the penetration part 210. The above design effectively avoids interference between the electrical connection between the first connection part 220 and the circuit to be tested and the electrical connection between the second connection part 230 and the circuit to be tested, thereby improving the connection efficiency; at the same time, it also reduces the mutual interference between the first connection part 220 and the second connection part 230, thereby ensuring the stability and accuracy of signal transmission.

[0043] Reference Figures 1 to 4 In a specific embodiment, the penetration hole 110 is a through hole, and the length direction of the penetration portion 210 is parallel to the extension direction of the penetration hole 110; the first connecting portion 220 is connected to the first end of the penetration portion 210, and the first preset angle is 90°; the second connecting portion 230 is connected to the second end of the penetration portion 210, and the first end of the penetration portion 210 is arranged opposite to the second end of the penetration portion 210; at the same time, the second preset angle is 90°, and the second connecting portion 230 extends in a direction away from the first connecting portion 220.

[0044] Reference Figures 1 to 4 In one embodiment, the primary winding 200 is made of silver wire. The primary winding 200 designed in this way has low resistance, high mechanical strength, excellent thermal stability and excellent molding ability, which can effectively reduce energy loss. These characteristics enable the primary winding 200 to operate stably under high current conditions to meet the requirements of high efficiency and reliability.

[0045] Reference Figures 1 to 4 In one embodiment, the magnetic component 100 is a magnetic ring having a center hole, the primary winding 200 is passed through the center hole, and the center hole is formed as the passing hole 110; the secondary winding 300 is spirally wound on the magnetic ring along the circumference of the magnetic ring.

[0046] In this embodiment, the cross section of the magnetic ring is a circular ring. In other embodiments, the cross section of the magnetic ring can also be a square ring or other rings. The specific shape of the magnetic ring depends on actual needs and is not restricted here. The secondary winding 300 is a single wire. The secondary winding 300 is divided into a plurality of secondary loops 310 arranged in sequence along the circumference of the magnetic ring. The secondary loops 310 are arranged in sequence along the outer circumference of the magnetic ring, the first end face of the magnetic ring, the hole wall of the center hole, and the second end face of the magnetic ring. The outer circumference of the magnetic ring is arranged opposite to the hole wall of the center hole, and the first end face of the magnetic ring is arranged opposite to the second end face of the magnetic ring. The above design not only effectively utilizes the circumferential space of the magnetic ring, improves the space utilization rate, effectively reduces the volume of the current transformer, but also enhances the coupling efficiency. In addition, the above design also helps the secondary winding 300 to dissipate heat evenly, thereby improving the heat dissipation efficiency of the secondary winding 300.

[0047] Reference Figures 1 to 4 In one implementation, an insulating sleeve 400 is sleeved and installed on the primary winding 200 , and at least a portion of the structure of the insulating sleeve 400 is located in the penetration hole 110 .

[0048] In this embodiment, the insulating sleeve 400 is fixedly sleeved on the outer peripheral surface of the penetration part 210, and the insulating sleeve 400 can be made of materials such as polyimide, polyethylene, polyvinyl chloride, epoxy resin or ceramic. The insulating sleeve 400 not only plays the role of electrical insulation, effectively prevents the short circuit between the primary winding 200 and the secondary winding 300, and ensures the safety and reliability of the current transformer, but also plays the role of mechanical protection, avoiding the primary winding 200 from external mechanical impact, wear, corrosion, etc., and effectively prolonging the service life of the primary winding 200. In addition, the above design also plays a shielding role, reduces the impact of external electromagnetic interference on the primary winding 200, and improves the stability of the signal and the accuracy of the measurement. In addition, in order to enhance the electrical insulation effect, part of the structure of the insulating sleeve 400 is located in the penetration hole 110, and the two oppositely arranged end faces on the insulating sleeve 400 are both located outside the penetration hole 110.

[0049] Reference Figures 1 to 3 In one embodiment, the secondary winding 300 is an enameled copper wire, and the enameled copper wire is made of polyester imide material, and the temperature resistance grade of the enameled copper wire is 220°C.

[0050] In this embodiment, the operating temperature range of the current transformer is -55°C to 150°C. The above design not only ensures that the secondary winding 300 does not expand and does not deform geometrically after being heated, thereby effectively improving the thermal stability and thermal reliability of the current transformer, but also gives the secondary winding 300 excellent electrical insulation performance, chemical corrosion resistance and mechanical strength, which together enhance the safety and reliability of the current transformer and ensure that it can operate stably in various working environments.

[0051] Reference Figures 1 to 4 In one embodiment, the magnetic ring is made of manganese-zinc ferrite material. The magnetic ring made of manganese-zinc ferrite material not only improves the magnetic flux efficiency and energy utilization rate of the current transformer, but also enhances the anti-interference ability and thermal stability, thereby improving the safety and reliability of the current transformer.

[0052] Reference Figures 1 to 3 In one implementation, the current transformer further includes a mounting base 500 , and the magnetic component 100 is mounted on the mounting base 500 .

[0053] In this embodiment, the connection structure can be installed on the mounting seat 500 by gluing, welding or mechanical fixing. The provided mounting seat 500 plays the role of mounting and carrying the magnetic component 100. In addition, in order to facilitate the mounting seat 500 to be installed on the component to be installed, the mounting seat 500 is provided with at least one mounting through hole 520 for the mounting seat 500 to be installed on the component to be installed.

[0054] Reference Figures 1 to 3 In one embodiment, the mounting seat 500 has a mounting hole 510, at least part of the structure of the magnetic component 100 is installed in the mounting hole 510, and there is a connecting gap between the magnetic component 100 and the hole wall of the mounting hole 510, the connecting gap is filled with insulating paint, and the magnetic component 100 is installed in the mounting hole 510 through the insulating paint.

[0055] In this embodiment, part of the structure of the magnetic component 100 is installed in the mounting hole 510. The insulating paint provided can not only effectively isolate the electrical contact between the magnetic component 100 and the mounting base 500, prevent short circuit and leakage, thereby effectively improving the safety of the current transformer, but also enhance the stability of the magnetic component 100, reduce the displacement caused by vibration or impact, and improve the vibration resistance and impact resistance of the current transformer. In addition, the insulating paint can also protect the magnetic component 100 from corrosion, extend its service life, simplify the installation steps, reduce the dependence on mechanical fasteners, and reduce the complexity of installation.

[0056] Reference Figures 1 to 3In one embodiment, the mounting base 500 is made of high temperature resistant glass fiber material. The mounting base 500 made of high temperature resistant glass fiber material not only provides excellent high temperature resistance and mechanical strength, but also has good insulation and chemical corrosion resistance. These characteristics together improve the safety, reliability and durability of the current transformer in various working environments.

[0057] In summary, the current transformer provided by the present embodiment has at least the following beneficial technical effects: the primary winding 200 in the present application is inserted into the insertion hole 110. This design not only makes the integration of the primary winding 200 and the magnetic component 100 more compact, reduces the overall volume of the current transformer, and facilitates the installation and use of the current transformer in a space-constrained environment, which greatly broadens the scope of application of the current transformer; at the same time, it also effectively utilizes the magnetic field generated by the magnetic component 100, and enhances the magnetic coupling efficiency between the primary winding 200 and the secondary winding 300; in addition, the above design also improves air flow, reduces the risk of overheating of the primary winding 200, and thus improves the heat dissipation performance of the current transformer. The secondary winding 300 is wound on the magnetic component 100. This design enables the secondary winding 300 and the primary winding 200 to be effectively combined on the same component, further reducing the overall volume of the current transformer.

[0058] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A current transformer, characterized in that: include: A magnetic component having a through hole; A primary winding, used for being electrically connected to the circuit to be tested and being inserted into the insertion hole; The secondary winding is used for electrically connecting to the component to be connected and is wound around the magnetic component.

2. The current transformer according to claim 1, characterized in that: The primary winding comprises a penetration portion and a first connecting portion, wherein the penetration portion is penetrated in the penetration hole; The first connecting portion is located outside the penetration hole and connected to the penetration portion, and is used for being electrically connected to the circuit to be tested.

3. The current transformer according to claim 2, characterized in that: The primary winding also includes a second connecting portion, which is located outside the penetration hole and connected to the penetration portion for being electrically connected to the circuit to be tested.

4. The current transformer according to claim 3, characterized in that: A first preset angle is formed between the length direction of the first connecting portion and the length direction of the penetration portion, and the first preset angle is greater than 0° and less than or equal to 90°; and / or, A second preset angle is formed between the length direction of the second connecting portion and the length direction of the penetration portion, and the second preset angle is greater than 0° and less than or equal to 90°; and / or, The second connecting portion is arranged in a direction away from the first connecting portion; and / or, The length direction of the first connecting portion is parallel to the length direction of the second connecting portion; and / or, The first connecting portion is connected to the first end of the penetration portion, the second connecting portion is connected to the second end of the penetration portion, and the first end of the penetration portion and the second end of the penetration portion are arranged opposite to each other.

5. The current transformer according to claim 1, characterized in that: The primary winding is made of silver wire.

6. The current transformer according to any one of claims 1 to 5, characterized in that: The magnetic component is a magnetic ring having a center hole, the primary winding is inserted into the center hole, and the center hole is formed as the insertion hole; the secondary winding is spirally wound on the magnetic ring along the circumference of the magnetic ring.

7. The current transformer according to claim 6, characterized in that: An insulating sleeve is sleeved and installed on the primary winding, and at least a part of the structure of the insulating sleeve is located in the penetration hole.

8. The current transformer according to claim 7, characterized in that: The secondary winding is an enameled copper wire, which is made of polyesterimide material and has a temperature resistance of 220° C.; and / or, The magnetic ring is made of manganese-zinc ferrite material.

9. The current transformer according to any one of claims 1 to 5, characterized in that: The current transformer also includes a mounting base, and the magnetic component is mounted on the mounting base.

10. The current transformer according to claim 9, characterized in that: The mounting seat has a mounting hole, at least part of the structure of the magnetic component is mounted in the mounting hole, and a connection gap is formed between the magnetic component and the hole wall of the mounting hole, the connection gap is filled with insulating paint, and the magnetic component is mounted in the mounting hole through the insulating paint; and / or, The mounting seat is made of high temperature resistant glass fiber material.

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