Broadband magnetic-core-free current and voltage detection device

Abstract

The utility model relates to the technical field of detection devices, in particular to a broadband magnetic-core-free current and voltage detection device, which comprises a current-carrying conductor. A bottom plate is arranged at the top end of the current-carrying conductor, a Hall element is arranged at the top end of the bottom plate, the bottom plate is electrically connected with the Hall element through fastening structures on the two sides, connecting grooves are formed in the two sides of the top end of the bottom plate, clamping grooves are formed in the outer sides of the connecting grooves, and each fastening structure comprises a fastening bolt, a cable and a clamping frame fixed to the cable. The clamping frame is placed in the clamping groove, the cable is fixed in the clamping frame, the outer side of the current-carrying conductor is sleeved with the fastening plate, the outer side of the fastening plate is sleeved with the shielding cover, three-phase current often needs to be detected at the same time in a relay, a motor protector and a control and protection switching device (CPS), and the shielding cover plays a role in blocking mutual interference of magnetic fields of adjacent current-carrying conductors. And the detection accuracy is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of detection devices, in particular to a broadband coreless current and voltage detection device. Background Art

[0002] Current transformers are commonly used to detect the current flowing through a conductor. Traditional current transformers consist of three main parts: an iron core, a primary winding, and a secondary winding. The primary and secondary windings are wound around the iron core, and a load (such as a resistor) is connected to the secondary winding. The basic principle of this type of current transformer is the same as that of a typical single-phase transformer or voltage transformer: the current flowing through the primary winding is detected by measuring the voltage or current of the load.

[0003] In fact, existing current transformers generally have an iron core in their structure. For example, the Hall current detection device disclosed in Chinese patent document CN101013144A fixes the iron core to a circuit board and places the Hall element in the air gap of the iron core. Another example is the Hall current sensor disclosed in Chinese patent document CN201145706Y, which includes a ring-shaped iron core with radial gaps, and the Hall element is also placed in the gap of the ring-shaped iron core. When the current transformers disclosed in the above documents are used for current detection, when current flows through the conductor, a magnetic field is induced on the iron core. The Hall element detects this magnetic field, thereby detecting the current passing through the conductor. The advantage of using an iron core structure is that for small current detection, due to the weak magnetic field, it is sometimes difficult to detect, which reduces the accuracy of small current detection. Using an iron core can concentrate the magnetic field, thereby improving the accuracy of small current detection. However, when the current passing through the conductor is large, the magnetic flux generated in the iron core will show nonlinearity, which will cause the mutual inductance coefficient of the transformer to change, thereby reducing the detection accuracy; in addition, due to the limitations of the volume of the iron core itself and the frequency characteristics of the material, the current transformer with an iron core structure cannot detect DC current and higher frequency current (such as marine intermediate frequency 400~2kHz). In summary, the conductor current detection device with an iron core in the existing technology cannot take into account both small current detection accuracy and large current detection accuracy, and cannot realize the detection of higher frequency current and DC current, and thus the detection range is narrow. Utility Model Content

[0004] Technical problems solved

[0005] In response to the above-mentioned shortcomings of the existing technology, the utility model provides a broadband coreless current and voltage detection device, which can effectively solve the problem that the conductor current detection device with an iron core in the existing technology cannot take into account both small current detection accuracy and large current detection accuracy, and cannot realize the detection of higher frequency current and DC current, and thus has a narrow detection range.

[0006] Technical Solution

[0007] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] The utility model provides a broadband coreless current and voltage detection device, comprising a current-carrying conductor; a bottom plate is provided at the top of the current-carrying conductor, a Hall element is provided at the top of the bottom plate, the bottom plate is electrically connected to the Hall element through fastening structures on both sides, connection grooves are provided on both sides of the top of the bottom plate, a clamping groove is provided on the outside of the connection groove, the fastening structure comprises a fastening bolt, a cable and a clamping frame fixed to the cable, the clamping frame is placed in the clamping groove, the cable is fixed in the clamping frame, a fastening plate is sleeved on the outside of the current-carrying conductor, and a shielding cover is sleeved on the outside of the fastening plate.

[0009] Furthermore, the fastening plate is a frame structure with no surface at the top, and the shielding cover is a frame structure with no surface at both sides.

[0010] Furthermore, the clamping groove and the connecting groove are connected structures, and a threaded structure is provided on the inner side wall of the connecting groove.

[0011] Furthermore, a receiving cavity is provided at the top of the Hall element, and a lead hole is provided at the front end of the Hall element.

[0012] Furthermore, the shielding cover is sleeved on the current-carrying conductor and covers the top of the Hall element.

[0013] Furthermore, a docking groove having an inner diameter smaller than that of the connecting groove is formed at the bottom end of the connecting groove, and the inner diameter of the connecting groove is adapted to the outer diameter of the clamping frame.

[0014] Beneficial effects

[0015] Compared with the known public technologies, the technical solution provided by this utility model has the following beneficial effects:

[0016] 1. The utility model provides a fastening structure, so the user can connect and fix the external cable with the cable, and then put the card frame structure at the top into the connection groove, and fix the card frame with the fastening bolt. During this process, the fastening bolt can be threadedly fixed with the docking groove on the inside of the connection groove, and finally the cable is placed in the card slot for positioning and fixing, thereby achieving the effect of fastening and bundling the cable.

[0017] 2. This device avoids the drawback of the prior art Hall current detection device using an iron core structure, which has a narrow detection range due to the iron core characteristics (saturation, frequency response), thereby improving the detection range of the Hall current detection device. Furthermore, since the iron core is omitted, even when a large current passes through the current-carrying conductor, the detection accuracy will not be greatly reduced due to iron core saturation, thereby improving the detection accuracy of the Hall current detection device when performing large current detection. The device also includes a shielding cover that is sleeved onto the current-carrying conductor and covers the top of the Hall element. In relays, motor protectors, and control and protection switchgear (CPS), it is often necessary to detect three-phase current simultaneously. The shielding cover serves to prevent interference between the magnetic fields of adjacent current-carrying conductors, thereby ensuring detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be derived from these drawings without inventive effort.

[0019] Figure 1 It is a structural diagram of the utility model;

[0020] Figure 2 This is a schematic structural diagram of the Hall element of the present invention;

[0021] Figure 3 This is a structural breakdown diagram of the present utility model;

[0022] Figure 4 This is a structural breakdown diagram of the fastening structure in the present utility model;

[0023] Figure 5 This is a structural breakdown diagram of the fastening structure in the utility model.

[0024] The numbers in the figure represent: 1. current-carrying conductor; 2. fastening plate; 3. Hall element; 31. accommodating cavity; 32. lead hole; 4. fastening structure; 41. fastening bolt; 42. cable; 43. clamping frame; 5. bottom plate; 51. connecting groove; 52. clamping slot; 6. shielding cover. DETAILED DESCRIPTION

[0025] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0026] The present invention will be further described below with reference to the embodiments.

[0027] Example: A broadband coreless current and voltage detection device, see the attached Figure 1 -Attached Figure 5 , including a current-carrying conductor 1; a bottom plate 5 is provided at the top of the current-carrying conductor 1, a Hall element 3 is provided at the top of the bottom plate 5, the bottom plate 5 is electrically connected to the Hall element 3 through the fastening structures 4 on both sides, a connection groove 51 is provided on both sides of the top of the bottom plate 5, a card slot 52 is provided on the outside of the connection groove 51, the fastening structure 4 includes a fastening bolt 41, a cable 42 and a card frame 43 fixed to the cable 42, the card frame 43 is placed in the card slot 52, the cable 42 is fixed in the card frame 43, the outer sleeve of the current-carrying conductor 1 is provided There is a fastening plate 2, and a shielding cover 6 is provided on the outer side of the fastening plate 2; through the fastening structure 4, the user can connect and fix the external cable 42 with the cable 42, and then put the clamping frame 43 structure at the top into the connecting groove 51, and fix the clamping frame 43 through the fastening bolt 41. During this process, the fastening bolt 41 can be threadedly fixed with the docking groove on the inner side of the connecting groove 51, and finally the cable 42 is placed in the clamping groove 52 for positioning and fixing, thereby achieving the effect of fastening and bundling the cable 42.

[0028] The fastening plate 2 is a frame structure with no surface at the top, and the shielding cover 6 is a frame structure with no surface on both sides; the card slot 52 and the connecting slot 51 are connected structures, and the inner wall of the connecting slot 51 is provided with a threaded structure; the top of the Hall element 3 is provided with a receiving cavity 31, and the front end of the Hall element 3 is provided with a lead hole 32; the shielding cover 6 is sleeved on the current-carrying conductor 1 and covers the top of the Hall element 3; the bottom end of the connecting slot 51 is provided with a docking groove with an inner diameter smaller than the inner diameter of the connecting slot 51, and the inner diameter of the connecting slot 51 is adapted to the outer diameter of the card frame 43; the problem in the prior art is avoided. The Hall current detection device using an iron core structure has a narrow detection range due to the iron core's characteristics (saturation, frequency response), thereby improving the detection range of the Hall current detection device. At the same time, because the use of the iron core is omitted, even when a large current passes through the current-carrying conductor 1, the detection accuracy will not be extremely reduced due to iron core saturation, thereby improving the detection accuracy of the Hall current detection device when detecting large currents. The device also includes a shielding cover 6, which is mounted on the current-carrying conductor 1 and covers the top of the Hall element 3. In relays, motor protectors, and control and protection switchgear (CPS), it is often necessary to detect three-phase current simultaneously. The shielding cover 6 blocks the mutual interference of the magnetic fields of adjacent current-carrying conductors 1, ensuring the accuracy of detection.

[0029] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A broadband coreless current and voltage detection device, characterized in that: The invention comprises a current-carrying conductor (1); a bottom plate (5) is provided at the top of the current-carrying conductor (1); a Hall element (3) is provided at the top of the bottom plate (5); the bottom plate (5) is electrically connected to the Hall element (3) through fastening structures (4) on both sides; a connection groove (51) is provided on both sides of the top of the bottom plate (5); a clamping groove (52) is provided on the outside of the connection groove (51); the fastening structure (4) comprises a fastening bolt (41), a cable (42) and a clamping frame (43) fixed to the cable (42); the clamping frame (43) is placed in the clamping groove (52); the cable (42) is fixed in the clamping frame (43); a fastening plate (2) is provided on the outside of the current-carrying conductor (1); and a shielding cover (6) is provided on the outside of the fastening plate (2).

2. A broadband coreless current and voltage detection device according to claim 1, characterized in that: The fastening plate (2) is a frame structure with no surface on the top, and the shielding cover (6) is a frame structure with no surface on both sides.

3. A broadband coreless current and voltage detection device according to claim 1, characterized in that: The clamping groove (52) and the connecting groove (51) are in a communicating structure, and a threaded structure is provided on the inner side wall of the connecting groove (51).

4. A broadband coreless current and voltage detection device according to claim 1, characterized in that: The top end of the Hall element (3) is provided with a receiving cavity (31), and the front end of the Hall element (3) is provided with a lead hole (32).

5. A broadband coreless current and voltage detection device according to claim 4, characterized in that: The shielding cover (6) is sleeved on the current-carrying conductor (1) and covers the upper portion of the Hall element (3).

6. A broadband coreless current and voltage detection device according to claim 1, characterized in that: The bottom end of the connecting groove (51) is provided with a docking groove having an inner diameter smaller than the inner diameter of the connecting groove (51), and the inner diameter of the connecting groove (51) is adapted to the outer diameter of the clamping frame (43).

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