Current transformer with magnetic isolation structure

Abstract

The utility model relates to the technical field of anti-electromagnetic interference structures, in particular to a current transformer with a magnetic isolation structure, which comprises a shell, a positioning mechanism, a transformer and a magnetic isolation ring, a round hole is arranged on the end face of the shell, the positioning mechanism is inserted in the round hole, the transformer is arranged on the positioning mechanism, the magnetic isolation ring is sleeved on the transformer, and the magnetic isolation ring is sleeved on the shell. A plurality of equihexagonal openings are formed in the end face of the magnetic isolation ring in a penetrating mode, the equihexagonal openings form a honeycomb-shaped structure on the magnetic isolation ring, the magnetic isolation ring is installed on the mutual inductor and can be made of soft magnetic alloy or silicon steel sheets or ferrite, and the honeycomb-shaped structure has the good magnetic conduction characteristic. And the mutual inductor in a measurement state is shielded by an external electromagnetic field, so that the accuracy of a measurement result of the mutual inductor is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of anti-electromagnetic interference structures, in particular to a current transformer with a magnetic isolation structure. Background Art

[0002] A current transformer is an electrical measuring device used to measure the current in a high voltage system. Its principle is to convert the current on the high voltage side into the corresponding current on the low voltage side, making the measurement more convenient and safer.

[0003] However, the prior art still has some shortcomings. For example, the patent number is CN90221337.7, which is a current transformer, which is composed of an iron core, a winding and an insulating shell, and is characterized by a primary busbar perforated window on the insulating shell. The utility model is fixed on the busbar through the primary busbar perforated window, and can be installed and moved longitudinally, which changes the prior art that requires the installation of a crossbeam for horizontal installation and movement. During the use of the device, external magnetic interference will affect the magnetic conductivity of the iron core, thereby reducing the measurement accuracy. Utility Model Content

[0004] The utility model aims to provide a current transformer with a magnetic isolation structure to solve the problem raised in the background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a current transformer with a magnetic isolation structure, comprising: a shell, a positioning mechanism, a transformer and a magnetic isolation ring, the shell end face is provided with a circular hole, the circular hole is plugged with a positioning mechanism, the transformer is mounted on the positioning mechanism, the transformer is mounted on the magnetic isolation ring, a plurality of equihexagonal openings are penetrated through the end face of the magnetic isolation ring, and the plurality of equihexagonal openings form a honeycomb structure on the magnetic isolation ring.

[0006] Preferably, the positioning mechanism includes: a positioning tube and a positioning strip, the end of the positioning tube is inserted into the circular hole, the other end of the positioning tube is placed in the outer shell, a plurality of positioning strips are installed on the side wall of the positioning tube, the length direction of the positioning strips is arranged parallel to the axis of the positioning tube, and the top end of the positioning tube is in contact with the inner wall of the mutual inductor.

[0007] Preferably, the mutual inductor comprises: an iron core and a winding, a plurality of iron cores are arranged in the shell, the iron cores are in contact with each other, a second circular hole is opened in the middle of the iron core, the inner wall of the second circular hole is in contact with the top of the positioning bar, a notch is opened at the bottom of the iron core, the notch, the iron core and the second circular hole constitute a winding part, an insulating layer is provided on the winding part, the winding is wound on the insulating layer, and the side wall of the iron core is in contact with the inner wall of the magnetic isolation ring.

[0008] Preferably, an epoxy resin ring is provided on the side wall of the magnetic isolation ring, and the side wall of the epoxy resin ring is in contact with the inner wall of the shell.

[0009] Preferably, the opening end of the shell is provided with a second shell.

[0010] Preferably, the second end surface of the shell is provided with a circular hole three, the periphery of the circular hole three is provided with an annular groove, the inner wall of the annular groove is arranged toward the shell, and the annular groove is plug-fitted with the other end of the positioning tube.

[0011] Preferably, the side wall of the positioning tube is rotatably connected with a worm gear ring, which is arranged between the inner end surface of the shell and the iron core. The worm gear ring is meshingly connected to the worm, one end of the worm is rotatably connected to the inner wall of the shell, and the other end of the worm that passes through the side wall of the shell is equipped with a handwheel.

[0012] Preferably, the worm gear ring is provided with an end of a rotating shaft, the end of a wire is rotatably connected to the rotating shaft, the other end of the wire is connected to the end of a spring, the spring is sleeved on a guide column, the guide column is installed in the outer shell, the end of the second wire is provided on the spring, the other end of the second wire passes through the end surface of the outer shell, and the other end of the spring is fixed to the guide column.

[0013] Preferably, the other end of the rotating shaft is connected to a conductive plate, and a slot is formed on a side wall at the bottom end of the conductive plate, and the slot is engaged with a side wall of the inner conductor 3 of the winding.

[0014] Preferably, the winding end is connected to one end of a wire four, and the other end of the wire four passes through the two end surfaces of the housing.

[0015] The beneficial effects of the utility model are as follows:

[0016] 1. Install a magnetic isolation ring on the mutual inductor. The magnetic isolation ring can be made of soft magnetic alloy, silicon steel sheet or ferrite. The honeycomb structure has good magnetic conductivity, which can shield the mutual inductor in the measuring state from the external electromagnetic field, thereby improving the accuracy of the measurement result of the mutual inductor;

[0017] 2. At the same time, a honeycomb structure is provided on the magnetic isolation ring, which can reduce the weight of the magnetic isolation ring and further improve the structural strength of the magnetic isolation ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a cross-sectional view of the main structure of the utility model;

[0019] Figure 2 It is a schematic diagram of the honeycomb structure of the magnetic isolation ring of the utility model;

[0020] Figure 3 This is a cross-sectional view of the positioning tube of the utility model;

[0021] Figure 4 This is a schematic diagram of the installation position of the iron core of the utility model;

[0022] Figure 5 It is a schematic diagram of the connection relationship between the wire and the rotating shaft of the utility model;

[0023] Figure 6 It is a schematic diagram of the three-clip connection relationship between the conductive plate and the winding wire of the utility model.

[0024] In the figure: housing 1, positioning mechanism 2, mutual inductor 3, magnetic isolation ring 4, positioning tube 5, positioning bar 6, iron core 7, winding 8, housing 2 9, worm wheel ring 10, worm 11, wire 12, conductive plate 13. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] Example 1: Reference Figure 1 and Figure 2 A current transformer with a magnetic isolation structure comprises: a shell 1, a positioning mechanism 2, a transformer 3 and a magnetic isolation ring 4. The shell 1 has a circular hole on its end face, the positioning mechanism 2 is inserted into the circular hole, the transformer 3 is mounted on the positioning mechanism 2, the magnetic isolation ring 4 is mounted on the transformer 3, and a plurality of equihexagonal openings are opened through the end face of the magnetic isolation ring 4, and the plurality of equihexagonal openings form a honeycomb structure on the magnetic isolation ring 4.

[0028] The principle of the above scheme is:

[0029] A positioning mechanism 2 is installed on the housing 1, a mutual inductor 3 is installed on the positioning mechanism 2, a magnetic isolation ring 4 is installed on the mutual inductor 3, a plurality of equihexagonal openings are opened in the magnetic isolation ring 4, and the plurality of equihexagonal openings form a honeycomb structure on the magnetic isolation ring 4. When the current needs to be measured, the conductor to be measured is passed through the positioning mechanism 2, the magnetic isolation ring 4 isolates the electromagnetic field in the environment, and the mutual inductor 3 transmits the measurement result to the ammeter to obtain the measurement result.

[0030] The beneficial effects of the above scheme are:

[0031] A magnetic isolation ring 4 is installed on the mutual inductor 3. The magnetic isolation ring 4 can be made of soft magnetic alloy, silicon steel sheet or ferrite. The honeycomb structure has good magnetic conductivity characteristics, which can shield the mutual inductor 3 in the measuring state from the external electromagnetic field, thereby improving the accuracy of the measurement result of the mutual inductor 3. At the same time, the honeycomb structure is set on the magnetic isolation ring 4, which can reduce the weight of the magnetic isolation ring 4 and further improve the structural strength of the magnetic isolation ring 4.

[0032] Example 2: Reference Figure 3 The positioning mechanism 2 includes: a positioning tube 5 and a positioning strip 6. The end of the positioning tube 5 is inserted into the circular hole, and the other end of the positioning tube 5 is placed in the shell 1. A plurality of positioning strips 6 are installed on the side wall of the positioning tube 5. The length direction of the positioning strip 6 is parallel to the axis of the positioning tube 5. The top end of the positioning tube 5 contacts and cooperates with the inner wall of the mutual inductor 3.

[0033] The principle of the above scheme is:

[0034] The end of the positioning tube 5 is inserted into the circular hole, and a plurality of positioning strips 6 are installed on the side wall of the positioning tube 5 . The length direction of the positioning strips 6 is arranged parallel to the axis of the positioning tube 5 , and the top end of the positioning tube 5 contacts and cooperates with the inner wall of the mutual inductor 3 .

[0035] The beneficial effects of the above scheme are:

[0036] The end of the positioning tube 5 is inserted into the circular hole to improve the stability of the installation of the positioning tube 5; the positioning tube 5 cooperates with the circular hole to provide space for the passage of the wire to be measured; and a plurality of positioning strips 6 are installed on the side wall of the positioning tube 5 to facilitate the installation of the mutual inductor 3.

[0037] Example 3: Reference Figure 3 , Figure 4 and Figure 6 The mutual inductor 3 includes: an iron core 7 and a winding 8. A plurality of iron cores 7 are arranged in the housing 1. The iron cores 7 are in contact with each other. A second circular hole is opened in the middle of the iron core 7. The inner wall of the second circular hole is in contact with the top of the positioning strip 6. A notch is opened at the bottom of the iron core 7. The notch, the iron core 7 and the second circular hole constitute a winding part. An insulating layer is provided on the winding part. The winding 8 is wound on the insulating layer. The side wall of the iron core 7 is in contact with the inner wall of the magnetic isolation ring 4.

[0038] The principle of the above scheme is:

[0039] The plurality of iron cores 7 are in contact with each other, a second circular hole is opened in the middle of the iron core 7, and the inner wall of the second circular hole is in contact with the top of the positioning strip 6;

[0040] A notch is formed at the bottom of the iron core 7 , and the notch, the iron core 7 and the circular hole form a winding portion. The winding portion provides space for the arrangement of the winding 8 , and an insulating layer is provided between the winding portion and the winding 8 .

[0041] The beneficial effects of the above scheme are:

[0042] The inner wall of the second circular hole is in contact with the top of the positioning strip 6. While positioning the iron core 7, the positioning tube 5 also reduces the contact area between the two. When the iron core 7 generates heat during operation, the heat will not be directly transferred to the positioning tube 5, thereby preventing the positioning tube 5 from being deformed by heat and affecting the disassembly and assembly of the iron core 7. The winding part composed of the groove, the iron core 7 and the circular hole provides space for the setting of the winding 8, and at the same time can prevent the bottom of the winding 8 from directly contacting the magnetic isolation ring 4.

[0043] Example 4: Reference Figure 4 The side wall of the magnetic isolation ring 4 is provided with an epoxy resin ring, and the side wall of the epoxy resin ring is in contact with the inner wall of the shell 1.

[0044] The principle of the above scheme is:

[0045] Epoxy resin is applied to the side wall of the magnetic isolation ring 4 . After the epoxy resin is dried, an epoxy resin ring is formed. The epoxy resin ring is arranged between the housing 1 and the magnetic isolation ring 4 .

[0046] The beneficial effects of the above scheme are:

[0047] Providing an epoxy resin ring improves the insulation effect within the device.

[0048] Example 5: Reference Figure 4 The opening end of the shell 1 is provided with a shell 2 9.

[0049] The principle of the above scheme is:

[0050] The opening of the shell 1 is provided with a shell 2 9 .

[0051] The beneficial effects of the above scheme are:

[0052] The second housing 9 seals the housing 1 to prevent dust from entering the housing 1 ; at the same time, the safety of the mutual inductor 3 during operation is improved.

[0053] Example 6: Reference Figure 4 The end surface of the shell 2 9 is provided with a circular hole 3, and the periphery of the circular hole 3 is provided with an annular groove, the inner wall of the annular groove is arranged toward the shell 1, and the annular groove is plugged and matched with the other end of the positioning tube 5.

[0054] The principle of the above scheme is:

[0055] The annular groove is plug-fitted with the other end of the positioning tube 5 .

[0056] The beneficial effects of the above scheme are:

[0057] The installation stability of the housing 1 and the housing 2 9 is improved; at the same time, the annular groove provides support for the other end of the positioning tube 5, thereby improving the stability of the positioning tube 5.

[0058] Example 7: Reference Figure 3-Figure 6 The side wall of the positioning tube 5 is rotatably connected with a worm gear ring 10, which is arranged between the inner end surface of the outer shell 1 and the iron core 7. The worm gear ring 10 is meshed with a worm 11, one end of the worm 11 is rotatably connected to the inner wall of the outer shell 1, and the other end of the worm 11 that passes through the side wall of the outer shell 1 is equipped with a handwheel.

[0059] The worm gear ring 10 is provided with an end of a rotating shaft, and an end of a wire 12 is rotatably connected to the rotating shaft. The other end of the wire 12 is connected to the end of a spring. The spring is sleeved on a guide column. The guide column is installed in the housing 1. The end of the second wire is provided on the spring. The other end of the second wire passes through the end surface of the housing 1, and the other end of the spring is fixed to the guide column.

[0060] The other end of the rotating shaft is connected to a conductive plate 13 , and a slot is formed on the side wall of the bottom end of the conductive plate 13 , and the slot is engaged with the side wall of the conductor 3 in the winding 8 .

[0061] The end of the winding 8 is connected to one end of a wire 4, and the other end of the wire 4 passes through the end surface of the housing 2 9.

[0062] The principle of the above scheme is:

[0063] Before measuring, connect the positive pole of the ammeter to the wire 2 or wire 4, and connect the negative pole of the ammeter to the wire 4 or wire 2. When the current measured by the device is small, the value measured by the ammeter does not change significantly. Turn the handwheel clockwise, the handwheel drives the worm 11 to rotate clockwise, the worm 11 drives the worm gear ring 10 meshing with it to rotate, the worm gear ring 10 drives the conductive plate 13 to rotate, the slot on the conductive plate 13 moves, and the conductive plate 3 is clamped at the same time, so that the number of turns of the winding 8 between the conductive plate 13 and the conductive plate 4 is Increase; at the same time, when the worm gear ring 10 drives the conductive plate 13 to rotate, it synchronously drives the rotating shaft to rotate, the rotating shaft and the end of the wire 12 rotate relative to each other, and the spring is stretched; when measuring a larger current, the worm 11 rotates counterclockwise to drive the worm gear ring 10 to rotate in the opposite direction, and the conductive plate 13 is again clamped with the other wire three of the winding 8, reducing the number of turns of the winding 8 between the conductive plate 13 and the wire four; further, the rotating shaft rotates relative to the end of the wire 12 again, and the rotation direction is opposite to the previous rotation direction, and the spring is reset.

[0064] The beneficial effects of the above scheme are:

[0065] The conductive plate 13 and the rotating shaft are both made of metal with good conductivity. The number of turns of the winding 8 between the conductive plate 13 and the conductor 4 can be increased or decreased according to the actual size of the current to be measured, thereby improving the accuracy of measuring a smaller current to be measured. For a larger current to be measured, the power consumption in the winding 8 can be reduced, thereby improving the accuracy of the measurement and protecting the ammeter. The spring is installed on the guide column, one end of the spring is connected to the end of the conductor 12, and the other end of the conductor 12 is rotatably connected to the rotating shaft. When the other end of the conductor 12 is away from the spring, the spring is stretched, and the other end of the conductor 12 and the rotating shaft rotate relative to each other, thereby preventing the conductor 12 from being broken during measurement.

[0066] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any figure mark in the claims should not be regarded as limiting the claims involved.

Claims

1. A current transformer with a magnetic isolation structure, characterized in that: include: A housing (1), a positioning mechanism (2), a mutual inductor (3) and a magnetic isolation ring (4); the housing (1) has a circular hole on its end face, the positioning mechanism (2) is inserted into the circular hole, the mutual inductor (3) is mounted on the positioning mechanism (2), the magnetic isolation ring (4) is mounted on the mutual inductor (3), a plurality of equihexagonal openings are penetrated through the end face of the magnetic isolation ring (4), and the plurality of equihexagonal openings form a honeycomb structure on the magnetic isolation ring (4).

2. A current transformer with a magnetic isolation structure according to claim 1, characterized in that: The positioning mechanism (2) comprises: a positioning tube (5) and a positioning strip (6); the end of the positioning tube (5) is inserted into the circular hole; the other end of the positioning tube (5) is placed in the housing (1); a plurality of positioning strips (6) are arranged on the side wall of the positioning tube (5); the length direction of the positioning strips (6) is arranged parallel to the axis of the positioning tube (5); and the top end of the positioning tube (5) is in contact with the inner wall of the mutual inductor (3).

3. A current transformer with a magnetic isolation structure according to claim 2, characterized in that: The mutual inductor (3) comprises: an iron core (7) and a winding (8). A plurality of iron cores (7) are arranged in the housing (1). The iron cores (7) are in contact with each other. A second circular hole is provided in the middle of the iron core (7). The inner wall of the second circular hole is in contact with the top of the positioning strip (6). A notch is provided at the bottom of the iron core (7). The notch, the iron core (7) and the second circular hole form a winding part. An insulating layer is provided on the winding part. The winding (8) is wound on the insulating layer. The side wall of the iron core (7) is in contact with the inner wall of the magnetic isolation ring (4).

4. A current transformer with a magnetic isolation structure according to claim 3, characterized in that: An epoxy resin ring is provided on the side wall of the magnetic isolation ring (4), and the side wall of the epoxy resin ring is in contact with and fits with the inner wall of the outer shell (1).

5. A current transformer with a magnetic isolation structure according to claim 4, characterized in that: The opening end of the shell (1) is provided with a second shell (9).

6. A current transformer with a magnetic isolation structure according to claim 5, characterized in that: The end surface of the second shell (9) is provided with a circular hole three, and the periphery of the circular hole three is provided with an annular groove, the inner wall of the annular groove is arranged toward the shell (1), and the annular groove is plugged and matched with the other end of the positioning tube (5).

7. A current transformer with a magnetic isolation structure according to claim 6, characterized in that: The side wall of the positioning tube (5) is rotatably connected with a worm wheel ring (10), which is arranged between the inner end surface of the outer shell (1) and the iron core (7). The worm wheel ring (10) is meshingly connected with a worm (11), one end of the worm (11) is rotatably connected to the inner wall of the outer shell (1), and the other end of the worm (11) that passes through the side wall of the outer shell (1) is equipped with a hand wheel.

8. The current transformer with a magnetic isolation structure according to claim 7, characterized in that: The worm wheel ring (10) is provided with an end of a rotating shaft, the end of a wire (12) is rotatably connected to the rotating shaft, the other end of the wire (12) is connected to the end of a spring, the spring is sleeved on a guide column, the guide column is installed in the housing (1), the end of the second wire is provided on the spring, the other end of the second wire passes through the end surface of the housing (1), and the other end of the spring is fixed to the guide column.

9. A current transformer with a magnetic isolation structure according to claim 8, characterized in that: The other end of the rotating shaft is connected to a conductive plate (13), and a slot is formed on the side wall of the bottom end of the conductive plate (13), and the slot is engaged with the side wall of the inner conductor 3 of the winding (8).

10. A current transformer with a magnetic isolation structure according to claim 9, characterized in that: The end of the winding (8) is connected to one end of a conductor four, and the other end of the conductor four passes through the end surface of the second housing (9).

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