A current detection device

Abstract

The utility model provides a kind of current detection device, belongs to current detection technical field, device includes: the annular magnetic core unit of two independent magnetic cores, the induction coil wound on annular magnetic core unit, the shell for the fixation of annular magnetic core unit, power supply circuit, power module, roth coil, signal processing circuit and peripheral antenna;Annular magnetic core unit and induction coil carry out electromagnetic induction power generation, and electric energy is stored to power module for signal processing circuit power supply by power supply circuit, current acquisition is carried out by roth coil, after signal processing circuit carries out integral processing to current, convert into digital signal, and transmit by peripheral antenna;The shell of device is also provided with compression spring, positioning column, positioning hole, ensure the tightness of two independent magnetic core closure, to effectively reduce magnetic circuit air gap, improve magnetic permeability, so that induction coil can more efficiently capture the alternating magnetic flux generated by cable, significantly improve the electric energy acquisition efficiency.

Description

Technical Field

[0001] This utility model relates to the field of current detection technology, and specifically to a current detection device. Background Technology

[0002] Current sensing is a key technology in fields such as power electronics, industrial control, and energy management. It is used to monitor the current in a circuit in real time to achieve protection, control, and optimization.

[0003] In high-voltage, high-current, or electrically isolated scenarios, non-contact current detection methods are often required. Among these, the Rogowski coil is the most widely used current detection technology. Based on the principle of electromagnetic induction, the Rogowski coil places a current-carrying conductor inside a flexible hollow coil. When an alternating current flows through the conductor, an alternating magnetic field is generated around it. The coil directly senses the change in the magnetic field and outputs an induced voltage. This voltage signal is proportional to the rate of change of current. After processing by an integrating circuit, the waveform of the measured current can be reconstructed. Its core advantages include: flexible installation (Rogowski coils typically employ flexible or split structures, allowing direct placement onto pre-wired, enclosed conductors without power disconnection or wire removal); good anti-saturation characteristics (due to the absence of a ferromagnetic core in the hollow coil, its linearity is excellent, preventing magnetic saturation even when measuring extremely large currents or signals containing DC components); and a wide dynamic range. However, existing Rogowski coils often can only be installed at the ends of current-carrying conductors for measurement. For long-span cables at the center, installation limitations prevent their application.

[0004] Therefore, it is necessary to improve upon the shortcomings of existing Rogowski coils and propose a current detection device that can be placed in the middle of a cable with a long span. Utility Model Content

[0005] The purpose of this invention is to provide a current detection device that solves the problem that existing technologies cannot be installed in the middle section of long-span cables for current detection.

[0006] This utility model provides a current detection device, comprising:

[0007] The ring core unit consists of two independent magnetic cores, an induction coil wound on the ring core unit, a housing for fixing the ring core unit, a power supply circuit, a power supply module, a Rogowski coil, a signal processing circuit, and an external antenna.

[0008] The ring magnetic core unit, power supply circuit, power supply module, and signal processing circuit are assembled inside the housing. The Rogowski coil is disposed outside the housing and is electrically connected to the signal processing circuit. The induction coil is electrically connected to the power supply circuit. The power supply circuit is electrically connected to the power supply module, which supplies power to the signal processing circuit. The external antenna is electrically connected to the signal processing circuit and is mounted outside the housing.

[0009] Furthermore, the housing includes an upper housing and a lower housing, the contact surfaces of the upper housing and the lower housing are provided with groove-shaped channels, the upper housing is provided with a first magnetic core fixing structure, and the lower housing is provided with a second magnetic core fixing structure, the first magnetic core fixing structure and the second magnetic core fixing structure are installed in mirror symmetrical arrangement.

[0010] Furthermore, both the first and second magnetic core fixing structures are provided with magnetic core compartments capable of assembling magnetic cores. The magnetic core compartments are provided with side baffles, and the side baffles are provided with wiring through holes and threaded holes. The wiring through holes are used for wiring the induction coil, and the threaded holes are used for bolting the magnetic core compartments and the side baffles.

[0011] Furthermore, the second magnetic core fixing structure has mounting holes at the four corners of the bottom of the magnetic core compartment, and the magnetic core compartment is fixed to the inside of the lower housing by bolts through the mounting holes.

[0012] Furthermore, the first magnetic core fixing structure has spring holes and through bolt holes at the four corners of the bottom of the magnetic core compartment. The first magnetic core fixing structure also has a compression spring, which is assembled in the spring hole. One end of the compression spring is assembled at the bottom of the spring hole and the other end is assembled inside the upper housing. The first magnetic core fixing structure is assembled inside the upper housing by bolts, and the top of the bolt is equipped with a bolt cap as a positioning post.

[0013] Furthermore, the second magnetic core fixing structure is provided with positioning holes.

[0014] Furthermore, the upper and lower housings are assembled by hinges and locked by latches.

[0015] Due to the adoption of the above technical solution, this utility model has the following beneficial effects:

[0016] This invention, through its separate upper and lower housing structure and slotted channel, ensures convenient installation on existing lines without damaging the cable. It employs a ring-shaped magnetic core unit composed of two independent magnetic cores and an induction coil wound on the ring-shaped magnetic core unit. When the cable is energized, based on the law of electromagnetic induction, the alternating current generates alternating magnetic flux in the ring-shaped magnetic core unit, forming a closed magnetic circuit. Under the action of the alternating magnetic flux, the induction coil on the ring-shaped magnetic core unit generates an induced electromotive force, thus forming a current. This current is conditioned by the power supply circuit and stored in the power module to power the signal processing circuit. After the current from the cable is collected by the Rogowski coil, it is integrated by the signal processing circuit and converted into a digital signal, which is then transmitted through an external antenna.

[0017] This invention ensures the tightness of the closed ring magnetic core unit through the cooperation of the compression spring, positioning post, and positioning hole in the first magnetic core fixing structure, thereby effectively reducing the air gap in the magnetic circuit, increasing the magnetic permeability, enabling the induction coil to capture the alternating magnetic flux generated by the cable more efficiently, and significantly improving the efficiency of power acquisition. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, do not constitute an undue limitation of the present invention. In the drawings:

[0019] Figure 1 This is a first schematic diagram of the device of this utility model;

[0020] Figure 2 This is a second schematic diagram of the device of this utility model;

[0021] Figure 3 This is a schematic diagram of the internal structure of the device of this utility model;

[0022] Figure 4 This is a schematic diagram of the first magnetic core fixing structure and the second magnetic core fixing structure of the device of this utility model;

[0023] Figure 5 This is a partial structural diagram of the first and second magnetic core fixing structures of the device of this utility model.

[0024] Figure 6 This is a cross-sectional view of the device of this utility model.

[0025] In the diagram: 1- Ring-shaped magnetic core unit; 2- Induction coil; 3- Housing; 31- Upper housing; 311- First magnetic core fixing structure; 3111- Compression spring; 32- Lower housing; 321- Second magnetic core fixing structure; 33- Slotted channel; 34- Magnetic core compartment; 341- Side baffle; 3411 Wiring through hole; 3412- Threaded hole; 3413- Mounting hole; 3414- Spring hole; 3415- Through bolt hole; 351- Positioning post; 352- Positioning hole; 4- Power circuit; 5- Power module; 6- Rogowski coil; 7- Signal processing circuit; 8- External antenna; 91- Hinge; 92- Hook and loop lock. Detailed Implementation

[0026] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The illustrative embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention.

[0027] Example 1

[0028] A current detection device, comprising:

[0029] The ring core unit 1 consists of two independent magnetic cores, the induction coil 2 is wound on the ring core unit 1, the housing 3 is used to fix the ring core unit 1, the power supply circuit 4, the power supply module 5, the Rogowski coil 6, the signal processing circuit 7, and the external antenna 8.

[0030] The ring magnetic core unit 1, power supply circuit 4, power supply module 5 and signal processing circuit 7 are assembled inside the housing 3. The Rogowski coil 6 is disposed outside the housing 3 and is electrically connected to the signal processing circuit 7. The induction coil 2 is electrically connected to the power supply circuit 4. The power supply circuit 4 is electrically connected to the power supply module 5. The power supply module 5 supplies power to the signal processing circuit 7. The external antenna 8 is electrically connected to the signal processing circuit 7 and is mounted outside the housing 3.

[0031] It should be further explained that the housing 3 includes an upper housing 31 and a lower housing 32. The contact surfaces of the upper housing 31 and the lower housing 32 are provided with a groove-shaped channel 33. The upper housing 31 is provided with a first magnetic core fixing structure 311, and the lower housing 32 is provided with a second magnetic core fixing structure 321. The first magnetic core fixing structure 311 and the second magnetic core fixing structure 321 are installed in a mirror-symmetrical manner.

[0032] In this embodiment, the separate structural design of the upper housing 31 and the lower housing 32, as well as the grooved channel 33, ensures that the device can be easily installed on existing lines without damaging the wires.

[0033] It should be further explained that both the first magnetic core fixing structure 311 and the second magnetic core fixing structure 321 are provided with a magnetic core compartment 34 for assembling a magnetic core. The magnetic core compartment 34 is provided with a side baffle 341. The side baffle 341 is provided with a wiring through hole 3411 and a threaded hole 3412. The wiring through hole 3411 is used for wiring the induction coil 2, and the threaded hole 3412 is used for bolt fixing the magnetic core compartment 34 and the side baffle 341.

[0034] It should be further explained that the magnetic core compartment 34 of the second magnetic core fixing structure 321 is provided with mounting holes 3413 at the four corners of the bottom of the magnetic core compartment 34, and the magnetic core compartment 34 is fixed to the inside of the lower housing 32 by bolts through the mounting holes 3413.

[0035] It should be further explained that the magnetic core fixing structure 311 has spring holes 3414 and through bolt holes 3415 at the four corners of the bottom of the magnetic core compartment 34. The first magnetic core fixing structure 311 also has a compression spring 3111. The compression spring 3111 is assembled in the spring hole 3414. One end of the compression spring 3111 is assembled at the bottom of the spring hole 3414 and the other end is assembled inside the upper housing 31. The first magnetic core fixing structure 311 is assembled inside the upper housing 31 by bolts. The top of the bolt is equipped with a bolt cap as a positioning post 351.

[0036] It should be further noted that the second magnetic core fixing structure 321 is provided with a positioning hole 352.

[0037] In this embodiment, the cooperation of the compression spring 3111, positioning post 351, and positioning hole 352 in the first magnetic core fixing structure 311 ensures the tightness of the magnetic core closure, thereby effectively reducing the air gap in the magnetic circuit, improving the magnetic permeability, enabling the induction coil 2 to capture the alternating magnetic flux generated by the cable more efficiently, and significantly improving the power acquisition efficiency. The positioning post 351 and positioning hole 352 ensure that the two magnetic cores can contact each other with the maximum contact surface.

[0038] It should be further explained that the upper housing 31 and the lower housing 32 are assembled by hinge 91 and locked by latch lock 92; this ensures both the convenience of opening and closing the device and the structural stability after closing.

[0039] Operating principle:

[0040] When using this device, open the latches 92 of the upper housing 31 and the lower housing 32, and install the device on the power cable. At this time, the power cable is placed on the slotted channel 33. After opening the Rogowski coil 6, it is suspended on the power cable. When the cable is energized, based on the law of electromagnetic induction, the alternating current causes the toroidal magnetic core unit 1 to generate alternating magnetic flux, forming a closed magnetic circuit. The induction coil 2 on the toroidal magnetic core unit 1 generates an induced electromotive force under the action of the alternating magnetic flux, thereby forming a current. The current is conditioned by the power supply circuit 4 and stored in the power supply module 5 to power the signal processing circuit 7. When the current of the cable is collected by the Rogowski coil 6, it is integrated by the signal processing circuit 7 and converted into a digital signal, which is finally transmitted through the external antenna 8.

[0041] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an indirect connection through an intermediate medium, or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0042] In the description of this utility model, the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0043] The terms "first," "second," and "third" (if any) in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the present utility model described can be implemented in orders other than those illustrated or described herein.

[0044] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, such as a process, method, system, product, or maintenance tool that includes a series of steps or units, not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or maintenance tool.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that, without departing from the structure of this utility model, several modifications and improvements can be made, and these should also be considered within the protection scope of this utility model. These will not affect the implementation effect of this utility model or the utility model of the patent.

Claims

1. A current detection device, characterized in that, include: The ring core unit (1) is composed of two independent magnetic cores, the induction coil (2) is wound on the ring core unit (1), the housing (3) for fixing the ring core unit (1), the power supply circuit (4), the power supply module (5), the Rogowski coil (6), the signal processing circuit (7), and the peripheral antenna (8). The ring magnetic core unit (1), power supply circuit (4), power supply module (5) and signal processing circuit (7) are assembled inside the housing (3). The Rogowski coil (6) is located outside the housing (3). The Rogowski coil (6) is electrically connected to the signal processing circuit (7). The induction coil (2) is electrically connected to the power supply circuit (4). The power supply circuit (4) is electrically connected to the power supply module (5). The power supply module (5) supplies power to the signal processing circuit (7). The external antenna (8) is electrically connected to the signal processing circuit (7). The external antenna (8) is installed outside the housing (3).

2. The current detection device according to claim 1, characterized in that: The housing (3) includes an upper housing (31) and a lower housing (32). The contact surfaces of the upper housing (31) and the lower housing (32) are provided with a groove-shaped channel (33). The upper housing (31) is provided with a first magnetic core fixing structure (311), and the lower housing (32) is provided with a second magnetic core fixing structure (321). The first magnetic core fixing structure (311) and the second magnetic core fixing structure (321) are installed in a mirror symmetrical manner.

3. The current detection device according to claim 2, characterized in that: Both the first magnetic core fixing structure (311) and the second magnetic core fixing structure (321) are provided with a magnetic core compartment (34) for assembling a magnetic core. The magnetic core compartment (34) is provided with a side baffle (341). The side baffle (341) is provided with a wiring through hole (3411) and a threaded hole (3412). The wiring through hole (3411) is used for wiring the induction coil (2), and the threaded hole (3412) is used for bolt fixing the magnetic core compartment (34) and the side baffle (341).

4. The current detection device according to claim 3, characterized in that: The magnetic core fixing structure (321) has mounting holes (3413) at the four corners of the bottom of the magnetic core compartment (34). The magnetic core compartment (34) is fixed to the inside of the lower housing (32) by bolts through the mounting holes (3413). The second magnetic core fixing structure (321) has positioning holes (352).

5. The current detection device according to claim 3, characterized in that: The first magnetic core fixing structure (311) has spring holes (3414) and through bolt holes (3415) at the four corners of the bottom of the magnetic core compartment (34) of the magnetic core fixing structure (311). The first magnetic core fixing structure (311) is also provided with a compression spring (3111). The compression spring (3111) is installed in the spring hole (3414). One end of the compression spring (3111) is installed at the bottom of the spring hole (3414) and the other end is installed inside the upper shell (31). The first magnetic core fixing structure (311) is installed inside the upper shell (31) by bolts. The top of the bolt is equipped with a bolt cap as a positioning post (351).

6. The current detection device according to any one of claims 2-5, characterized in that: The upper housing (31) and the lower housing (32) are assembled by a hinge (91) and locked by a latch lock (92).

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