Miniature current transformer suitable for new energy

Abstract

The miniature current transformer comprises a shell, a winding, a primary side and a secondary side, the shell is in a cuboid shape and comprises a containing shell and a buckling cover, one side of the containing shell is provided with an opening, the buckling cover is clamped and fixed to the opening side, the opening side is a circuit connecting side, pins of the primary side and the secondary side are arranged on the opening side, and the primary side and the secondary side are connected through the buckling cover. The first side comprises a U-shaped conductive piece, one side of the U-shaped conductive piece penetrates through the interior of the winding, and the other side of the U-shaped conductive piece is arranged outside the winding; the secondary side comprises a conductive insertion rod, an insertion fixing groove for fixing the conductive insertion rod is formed in the containing shell, and the section of the conductive insertion rod is in a rectangular anti-torsion shape. The miniature current transformer is simple in overall assembly process and winding installation process, small in structure and capable of being easily integrated in a small space structure; installation is simple, the connecting end and the conductive insertion rod can be fixed without soldering tin, a good connecting effect can be kept through the gradually-tightening clamping force of the flaring part, and the conductive insertion rod can be clamped and fixed in an auxiliary mode.

Description

Technical Field

[0001] The utility model relates to the technical field of electric power equipment, in particular to a micro current transformer suitable for new energy. Background Art

[0002] The current transformer is an indispensable secondary device in the power system. Its core working principle is electromagnetic induction. Specifically, the current transformer converts the large current on the primary side into a small current on the secondary side according to a certain ratio through its closed core and winding for measurement and monitoring.

[0003] The current transformer works based on the principle of electromagnetic induction. When current flows through the primary side, a magnetic field is generated in the iron core, which in turn induces current in the secondary winding. This induced current is proportional to the primary current, but the value is smaller, which is convenient for measuring and protecting equipment. In power systems, current transformers are widely used in secondary circuits such as metering, measurement, and relay protection. Especially in high voltage or high current environments, it is unsafe to measure directly with an ammeter, so indirect measurement through a current transformer is required. Current transformers play an important role in ensuring the safe and stable operation of power systems. They not only provide convenience for measurement, but also ensure the safety of operators.

[0004] The secondary inversion of current new energy sources requires converting DC into AC and connecting it to the grid. The control equipment or metering instruments on the secondary side require a miniature current transformer. Traditional current transformers have wires on the primary side and output on the secondary side, which requires a large installation space and is not easy to integrate in a smaller space structure. Therefore, the present invention designs a miniature current transformer with a smaller size, in which the primary line is built into the transformer, and at the same time, good primary and secondary insulation can be achieved for easy production.

[0005] In view of the above, it is necessary to propose a micro current transformer suitable for new energy to solve the above problems. Utility Model Content

[0006] The purpose of the utility model is to solve the above technical problems and provide a miniature current transformer suitable for new energy.

[0007] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a miniature current transformer suitable for new energy use, including a shell, a winding, a primary side, and a secondary side. The shell is in the shape of a rectangular parallelepiped and includes a containing shell and a buckle cover. One side of the containing shell has an opening, and the buckle cover is fixed to the opening side. The opening side is the circuit connection side. The pins of the primary side and the secondary side are both arranged on the opening side. The primary side includes a U-shaped conductive part, one side of the U-shaped conductive part is arranged through the interior of the winding, and the other side is placed outside the winding; the secondary side includes a conductive plug rod, and the containing shell is provided with a fixing groove for fixing the conductive plug rod, and the cross-section of the conductive plug rod is rectangular and anti-twist.

[0008] Furthermore, the fixing groove is arranged at two corners of the accommodating shell, and the fixing groove includes a clamping portion and a flaring portion. The clamping portion is connected to the lower end of the flaring portion, and the flaring portion is an inverted cone-shaped expansion opening with a narrow lower portion and a wide upper portion.

[0009] Furthermore, the cross section of the clamp is the same as the cross section of the conductive plug, and the conductive plug is inserted into the clamp with an interference fit.

[0010] Furthermore, the fixing groove also includes a side opening, which passes through the clamping part and the flaring part from top to bottom, and the side openings of the fixing grooves on both sides are arranged opposite to each other, and a step is provided on one side of the side opening, and the step is arranged at the connection between the clamping part and the flaring part.

[0011] Furthermore, the winding includes an iron core and a coil, wherein the coil is arranged around the iron core, and the coil is provided with two connecting ends, and the two connecting ends are respectively connected to the conductive plug rod.

[0012] Furthermore, the connection end is wound around the conductor plug rod to form a winding portion, the winding portion is inserted through the expansion opening and is constrained and tightened on the conductive plug rod by the expansion opening, and the step limits the height position of the connection end.

[0013] Furthermore, the accommodating shell also includes a center column and a corner column, the center column is located at the center position of the accommodating shell, the center column is arranged parallel to the direction of the wire insertion rod, the corner column is located at a corner position of the accommodating shell, the center column and the corner column are connected through a groove on the outer side of the bottom surface of the accommodating shell, one side of the U-shaped conductive part is inserted into the center column, and the other side is inserted into the corner column, and the bottom edge of the U-shaped conductive part is immersed in the groove.

[0014] Furthermore, potting glue is injected into the accommodating shell.

[0015] Compared with the prior art, the beneficial effects of the utility model are as follows: the utility model is suitable for a miniature current transformer for new energy, the overall assembly process and the winding installation process are simple, the structure is compact, and it can be easily integrated in a smaller space structure; the installation is simple, the connection end and the conductive plug rod can be fixed without soldering, and a good connection effect can be maintained by using the clamping force of the flared part that is gradually tightened, and the conductive plug rod can be auxiliary clamped and fixed.

[0016] High safety: Injecting potting glue inside can improve insulation and resistance to impact and vibration. Potting glue can also be used to change the overall heat transfer and heat dissipation capabilities; it helps with heat management during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is an external schematic diagram of a miniature current transformer suitable for new energy use in the utility model. Figure 1 ;

[0018] Figure 2 This is an external schematic diagram of a miniature current transformer suitable for new energy use in the utility model. Figure 2 ;

[0019] Figure 3 This is a schematic diagram of the internal structure of the housing of the utility model;

[0020] Figure 4 This is a structural diagram of the internal components of the utility model;

[0021] Figure 5 This is a schematic diagram of the installation of the miniature current transformer of the utility model;

[0022] In the figure: 1. shell; 2. winding; 3. accommodating shell; 4. buckle cover; 5. opening; 6. circuit connection side; 7. pin; 8. U-shaped conductive part; 9. conductive plug rod; 10. insertion groove; 11. clamping part; 12. flared part; 13. side opening; 14. step; 15. iron core; 16. coil; 17. connection end; 18. winding part; 19. center column; 20. corner column; 21. sink. DETAILED DESCRIPTION

[0023] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0024] A miniature current transformer suitable for new energy, such as Figure 1-5As shown, it includes a housing 1, a winding 2, a primary side, and a secondary side. The housing 1 is in a rectangular shape and includes a housing 3 and a buckle cover 4. One side of the housing 3 has an opening 5, and the buckle cover 4 is fixed on the side of the opening 5. The device uses the buckle cover 4 to seal the opening 5, so that the internal mutual inductor components are isolated from the outside, and the protection effect of the internal components is good. In actual use, potting glue can be injected into the housing 3. Potting glue is mainly used to protect and enhance the performance and life of electronic devices.

[0025] It also has the advantage of improving integrity: through potting, the overall structure of the device is strengthened, and the resistance to impact and vibration is improved. It also effectively enhances insulation: potting glue can improve the insulation between internal components and circuits, which is conducive to the miniaturization and lightweight design of electronic devices. Effectively enhance protection performance: prevent components and circuits from being directly exposed to the outside, improve waterproof, dustproof and moisture-proof performance, thereby extending the service life of electronic devices. Heat transfer and heat conduction: potting glue with good thermal conductivity can be used to help the heat management of this electronic device during operation. In addition, different potting glue materials have different characteristics. For example, epoxy resin potting glue is usually harder and difficult to remove after curing, and has good confidentiality; while silicone potting glue is widely used in the protection of electronic equipment under various environmental conditions due to its temperature resistance and flexibility.

[0026] Furthermore, the side of the opening 5 is the circuit connection side 6, and the pins 7 of the primary side and the secondary side are both arranged on the side of the opening 5. The connecting pins 7 with the circuit are all arranged on the same side, which can help to simplify the layout of the circuit and reduce the space occupied during installation, and the integration effect is better.

[0027] like Figure 4 As shown, the primary side includes a U-shaped conductive member 8, one side of which passes through the winding 2 and the other side is placed outside the winding 2; the secondary side includes a conductive plug 9, and a fixing groove 10 for fixing the conductive plug 9 is provided in the housing 3, and the cross section of the conductive plug 9 is a rectangular anti-twist shape. In this embodiment, the U-shaped primary side can form a structure that passes through the winding 2, and the pins 7 are turned to the same side, as shown in FIG. Figure 2 As shown, the U-shaped conductive member 8 on the primary side can be easily replaced; and the secondary side adopts a square structure design, which can prevent the conductive plug 9 from rotating after installation, and the winding portion 18 is easier to wind on the square outer wall.

[0028] Furthermore, the insertion groove 10 is arranged at two corners of the housing 3, and the insertion groove 10 includes a clamping portion 11 and a flaring portion 12. The clamping portion 11 is connected to the lower end of the flaring portion 12, and the flaring portion 12 is an inverted frustum-shaped expansion opening with a narrow lower portion and a wide upper portion. Figure 3 , 5As shown, the device can be assembled quickly, that is, the lower end of the conductive plug rod 9 can be inserted into the flared portion 12. The cross-section of the clamp is the same as the cross-sectional shape of the conductive plug rod 9, and the conductive plug rod 9 is inserted into the clamping portion 11 with an interference fit; therefore, when the lower end of the conductive plug rod 9 is inserted into the clamping portion 11, the side wall of the clamping portion 11 can clamp and fix the conductive plug rod 9, and the square cross-section can prevent the conductive plug rod 9 from rotating, which helps to improve the fixing effect.

[0029] Furthermore, the insertion slot 10 further includes a side opening 13, which passes through the clamping portion 11 and the flared portion 12 from top to bottom, and the side openings 13 of the insertion slots 10 on both sides are arranged opposite to each other, and the side opening 13 is used for the connection end 17 of the coil 16 to pass through and be wound on the iron core 15; a step 14 is provided on one side of the side opening 13, and the step 14 is arranged at the connection between the clamping portion 11 and the flared portion 12. Figure 3 As shown, the step 14 limits the height position of the connecting end 17 .

[0030] The winding 2 includes an iron core 15 and a coil 16. As shown in FIG4 , the coil 16 is arranged around the iron core 15. The coil 16 is provided with two connection ends 17, and the two connection ends 17 are respectively connected to the conductive plug rod 9. The connection end 17 is wound around the wire plug rod to form a winding portion 18. The winding portion 18 is inserted through the expansion opening and is constrained and tightened on the conductive plug rod 9 by the expansion opening. In the prior art, the connection end 17 needs to be soldered to the conductive plug rod 9 for fixing. This not only requires an additional welding process, but also after soldering, a bulge is easily formed on the solder joint, which is easy to cause jamming during installation, causing inconvenience. In order to avoid this problem, the solder joint needs to be polished, which adds more processing steps.

[0031] Furthermore, the housing 3 further comprises a center column 19 and a corner column 20. The center column 19 is located at the center of the housing 3 and is arranged parallel to the direction of the wire insertion rod. The corner column 20 is located at a corner of the housing 3. The center column 19 and the corner column 20 are connected on the outer side of the bottom surface of the housing 3 through a sink 21. One side of the U-shaped conductive member 8 is inserted into the center column 19, and the other side is inserted into the corner column 20. The bottom edge of the U-shaped conductive member 8 is immersed in the sink 21. Figure 2 , 3 As shown in Figures 5 and 6, the U-shaped conductive member 8 in the present device has a circular cross section and can be conveniently inserted into a slot formed by the center column 19, the sink 21, and the corner column 20. It is also convenient to assemble and replace. After installation, all surfaces of the housing 1 except the circuit connection side 6 are flat; the product is relatively regular.

[0032] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A miniature current transformer suitable for use in new energy, comprising a housing (1), a winding (2), a primary side, and a secondary side, characterized in that: The housing (1) is in the shape of a rectangular parallelepiped and comprises a containing shell (3) and a buckle cover (4); one side of the containing shell (3) has an opening (5); the buckle cover (4) is fixed to the side of the opening (5); the side of the opening (5) is a circuit connection side (6); the pins (7) of the primary side and the secondary side are both arranged on the side of the opening (5); the primary side comprises a U-shaped conductive member (8); one side of the U-shaped conductive member (8) penetrates the interior of the winding (2) and the other side is arranged outside the winding (2); the secondary side comprises a conductive plug rod (9); the containing shell (3) is provided with a fixing groove (10) for fixing the conductive plug rod (9); the cross section of the conductive plug rod (9) is a rectangular anti-twist shape.

2. A micro current transformer suitable for new energy according to claim 1, characterized in that: The insertion groove (10) is arranged at two corners of the accommodating shell (3), and the insertion groove (10) comprises a clamping portion (11) and a flaring portion (12). The clamping portion (11) is connected to the lower end of the flaring portion (12), and the flaring portion (12) is an inverted cone-shaped expansion opening with a narrow lower portion and a wide upper portion.

3. A micro current transformer suitable for new energy according to claim 2, characterized in that: The cross section of the clamp is the same as the cross section shape of the conductive plug rod (9), and the conductive plug rod (9) is inserted into the clamping portion (11) with an interference fit.

4. The micro current transformer suitable for new energy according to claim 2, characterized in that: The insertion groove (10) further comprises a side opening (13), the side opening (13) being arranged to penetrate the clamping portion (11) and the flared portion (12) from top to bottom, and the side openings (13) of the insertion grooves (10) on both sides are arranged opposite to each other, and a step (14) is provided on one side of the side opening (13), and the step (14) is arranged at the connection between the clamping portion (11) and the flared portion (12).

5. The micro current transformer suitable for new energy according to claim 4, characterized in that: The winding (2) comprises an iron core (15) and a coil (16), wherein the coil (16) is arranged around the iron core (15), and the coil (16) is provided with two connection ends (17), and the two connection ends (17) are respectively connected to the conductive plug rod (9).

6. A micro current transformer suitable for new energy according to claim 5, characterized in that: The connecting end (17) is wound around the conductor plug rod to form a winding portion (18), the winding portion (18) is inserted through the expansion opening and is constrained and tightened on the conductive plug rod (9) by the expansion opening, and the step (14) limits the height position of the connecting end (17).

7. The micro current transformer suitable for new energy according to claim 1, characterized in that: The accommodating shell (3) further comprises a center column (19) and a corner column (20), wherein the center column (19) is located at the center of the accommodating shell (3), the center column (19) is arranged parallel to the direction of the wire insertion rod, and the corner column (20) is located at a corner of the accommodating shell (3), the center column (19) and the corner column (20) are connected via a sink groove (21) on the outer side of the bottom surface of the accommodating shell (3), one side of the U-shaped conductive member (8) is inserted into the center column (19), and the other side is inserted into the corner column (20), and the bottom edge of the U-shaped conductive member (8) is immersed in the sink groove (21).

8. The micro current transformer suitable for new energy according to claim 1, characterized in that: A potting glue is injected into the accommodating shell (3).

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