Direct current leakage current sensor

Abstract

The utility model discloses a direct current leakage current sensor, which comprises a shell, a base and an annular iron core arranged in the shell, the shell comprises an upper shell and a lower shell, and the annular iron core is composed of a plurality of upper semi-ring sheet bodies and lower semi-ring sheet bodies which are respectively arranged in annular cavities of the upper shell and the lower shell. The end parts of the upper semi-ring sheet body and the lower semi-ring sheet body extend out of the shell and are oppositely propped against each other, and two adjacent sheets are arranged in a staggered insertion manner; the direct current electric leakage sensor is simple in structure, convenient to produce and assemble, convenient to assemble, scientific and reasonable in structural design and convenient for workers to open and buckle for use, the annular iron core is formed by staggering and embedding the end parts after buckling, the problem that the magnetic field and the precision are affected due to the fact that the connection parts of the end parts of an existing open-close type mutual inductor are prone to poor contact is solved, and the reliability of the direct current electric leakage sensor is improved. The staggered embedded structure design can also improve the use stability of the sensor.

Description

A DC leakage current sensor Technical Field

[0001] This utility model relates to the field of current sensor technology, specifically to a DC leakage current sensor. Background Technology

[0002] A leakage current sensor is a device that converts measured AC micro-currents or DC isolated currents into standard analog signals or RS485 digital signals, such as DC current and DC voltage, based on the electromagnetic isolation and magnetic modulation working principle of a current transformer. It is widely used for real-time monitoring of the insulation status of busbars and branch circuits in DC and AC power supply systems. Summary of the Invention

[0003] The technical solution of this utility model is as follows: a DC leakage current sensor, including a housing, a base, and an annular iron core disposed inside the housing. The housing includes an upper shell and a lower shell. The annular iron core is composed of several upper and lower annular pieces located in the annular cavities of the upper and lower shells, respectively. The ends of the upper and lower annular pieces extend out of the housing and abut against each other, and adjacent pieces are staggered and interlocked.

[0004] As a further feature of the above solution, the lower shell is fixed to the base, the upper shell is hinged to the lower shell on one side, and the other end is provided with a clip that matches and engages with the insert on the lower shell.

[0005] As a further provision of the above scheme, both the upper shell and the lower shell are configured as a cavity shell and a cover shell, and the cavity shell and the cover shell constitute an annular cavity for accommodating the annular iron core.

[0006] As a further feature of the above solution, the upper shell is provided with a hinge shaft, and the lower shell is provided with a hinge slot that matches the hinge shaft. The upper shell can hinge and swing relative to the lower shell and the base through the cooperation of the hinge shaft and the hinge slot.

[0007] As a further feature of the above solution, the base is provided with mounting hole one and mounting hole two for fixing.

[0008] Beneficial effects: The DC leakage current sensor of this utility model has a simple structure, is easy to manufacture and assemble, and is easy to install. Its scientific and reasonable structural design also makes it easy for staff to open and close it for use. The ring-shaped iron core formed by the misaligned interlocking of the ends after snapping reduces the problem of poor contact at the end connection of the existing open-type current transformer, which affects the magnetic field and accuracy. This misaligned interlocking structure design can also improve the stability of the sensor in use. Attached Figure Description

[0009] Figure 1 is a schematic diagram of the sensor structure of this utility model.

[0010] Figure 2 is a schematic diagram of the sensor in the open state of this embodiment.

[0011] Figure 3 is a schematic diagram of the sensor component assembly structure in this embodiment.

[0012] Reference numerals: 1. Shell; 11. Upper shell; 12. Lower shell; 13. Annular cavity; 14. Clamp; 15. Insert; 16. Cavity shell; 17. Cover shell; 18. Hinge shaft; 2. Base; 21. Mounting hole one; 22. Mounting hole two; 3. Annular iron core; 31. Upper half-ring body; 32. Lower half-ring body. Detailed Implementation

[0013] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, where there is no conflict, the embodiments and features described in these embodiments can be combined with each other.

[0014] As shown in Figures 1-3, a DC leakage current sensor includes a housing 1, a base 2, and an annular iron core 3 disposed inside the housing 1. The housing 1 includes an upper shell 11 and a lower shell 12. The annular iron core 3 is composed of several upper half-ring pieces 31 and lower half-ring pieces 32 respectively located in the annular cavities 13 of the upper shell 11 and the lower shell 12. The ends of the upper half-ring pieces 31 and the lower half-ring pieces 32 extend out of the housing 1 and abut against each other, and adjacent pieces are staggered and interlocked.

[0015] As a further feature of the above scheme, the lower shell 12 is fixed to the base 2, the upper shell 11 is hinged to the lower shell 12 on one side, and the other end is provided with a clip 14 that matches and engages with the insert 15 on the lower shell 12.

[0016] As a further provision of the above scheme, the upper shell 11 and the lower shell 12 are both provided as a cavity shell 16 and a cover shell 17, respectively. The cavity shell 16 and the cover shell 17 form an annular cavity 13 for housing the annular iron core 3. The upper shell 11 is provided with a hinge shaft 18, and the lower shell 12 is provided with a hinge slot that matches the hinge shaft 18. The upper shell 11 is hinged and swings relative to the lower shell 12 and the base 2 through the hinge shaft 18 and the hinge slot.

[0017] As a further feature of the above solution, the base 2 is provided with mounting hole 21 and mounting hole 22 for fixing.

[0018] The sensor of this utility model is shown in the figure. It mainly consists of a lower shell 12 and a base 2 that are fixed to each other and an upper shell 11 that is hinged to each other. An annular cavity 13 is also provided inside the upper shell 11 and the lower shell 12. In this embodiment, an upper half-ring plate 31 and a lower half-ring plate 32 are arranged in the annular cavity 13 inside the upper shell 11 and the lower shell 12. As shown in Figures 2 and 3, this embodiment forms an annular iron core 3 by means of several upper half-ring plates 31 and lower half-ring plates 32. The upper half-ring plates 31 and lower half-ring plates 32 inside the upper shell 11 and the lower shell 12 are composed of several plates stacked together. The adjacent plates are staggered, and the parts of the semi-ring plates that abut each other are staggered. Finally, the ends of the upper half-ring plates 31 and lower half-ring plates 32 after forming the annular iron core 3 are interlocked and abut each other to form an annular shape.

[0019] Furthermore, in this embodiment, both the upper shell 11 and the lower shell 12 are constructed by interlocking the cavity shell 16 and the cover shell 17. During assembly, the PCB, the upper half ring plate 31 and the lower half ring plate 32 are placed in the cavity shell 16 of the upper shell 11 and the lower shell 12 beforehand. Then, the cover shell 17 of the upper shell 11 is fastened first, and then it is placed into the cavity shell 16 of the lower shell 12 where the cover shell 17 is not fastened. The hinge shaft 18 is aligned with the hinge slot, and then the cover shell 17 is fastened to complete the assembly. The main connection and maintenance structure is located in the base 2 connected to the lower shell 12. Therefore, during maintenance, it is relatively convenient to only need to disassemble the cover shell 17 of the lower shell 12.

[0020] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of this utility model and its equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A DC leakage current sensor, comprising a housing (1), a base (2), and an annular iron core (3) disposed within the housing (1), wherein the housing (1) comprises an upper shell (11) and a lower shell (12), characterized in that: The annular core (3) is composed of several upper half-ring pieces (31) and lower half-ring pieces (32) located in the annular cavities (13) of the upper shell (11) and the lower shell (12), respectively. The ends of the upper half-ring pieces (31) and the lower half-ring pieces (32) extend out of the shell (1) and abut against each other, and the adjacent pieces are staggered and interlocked.

2. A DC leakage current sensor according to claim 1, characterized in that: The lower shell (12) is fixed to the base (2), and the upper shell (11) is hinged to the lower shell (12) on one side, and the other end is provided with a clip (14) that matches and engages with the insert (15) on the lower shell (12).

3. A DC leakage current sensor according to claim 1, characterized in that: The upper shell (11) and the lower shell (12) are both configured as a cavity shell (16) and a cover shell (17), and the cavity shell (16) and the cover shell (17) constitute an annular cavity (13) for housing the annular iron core (3).

4. A DC leakage current sensor according to claim 3, characterized in that: The upper shell (11) is provided with a hinge shaft (18), and the lower shell (12) is provided with a hinge slot that matches the hinge shaft (18). The upper shell (11) is hinged and swings relative to the lower shell (12) and the base (2) through the hinge shaft (18) and the hinge slot.

5. A DC leakage current sensor according to claim 1, characterized in that: The base (2) is provided with mounting hole one (21) and mounting hole two (22) for fixing.

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