A current transformer

Abstract

The present invention discloses a current transformer, comprising a main shell, a main cover plate, and a positioning seat, wherein the main cover plate is fixedly mounted on the main shell, a first connecting hole and a second connecting hole are provided on the positioning seat, and a plurality of connecting posts vertically passing through the first connecting hole are provided on the main shell, a lower limit sleeve and an upper limit sleeve are threadedly connected on the connecting post, the lower limit sleeve abuts against the bottom of the positioning seat, and the upper limit sleeve abuts against the top of the positioning seat to fix the positioning seat on the connecting post, after the lower limit sleeve and the upper limit sleeve rotate vertically along the connecting post, the positioning seat also moves vertically along the connecting post, and a horizontal positioning rod is threadedly connected in the second connecting hole. The beneficial effect of the present invention is that a positioning rod for fixing the wire is provided thereon, so as to improve the reliability of the current measurement in the wire, and at the same time, the positioning rod can move in the horizontal and vertical directions to adapt and fix wires of different sizes, especially small sizes.

Description

Technical Field

[0001] The invention belongs to the technical field of mutual inductors, and in particular relates to a current mutual inductor. Background Art

[0002] The main function of a current transformer is to convert large currents in high-voltage circuits into small currents in low-voltage circuits for measurement by measuring instruments. It is widely used in power systems, especially high-voltage transmission and distribution systems.

[0003] Most current transformers are directly installed on the outside of the conductor. When current passes through the conductor, a small induced current will be generated in the current transformer due to electromagnetic induction. By measuring the induced current with a measuring instrument, the current in the conductor can be measured in real time.

[0004] Most existing current transformers do not have a structure to fix the wire. When the wire is energized and moves relative to the current transformer, the induced current will also change, which will affect the accuracy of the current measurement in the wire by the measuring instrument. This is particularly obvious when the wire size is small. Therefore, it is necessary to set a current transformer that can fix the wire, especially the small-sized wire, after installation. Summary of the invention

[0005] The existing current transformer lacks a fixing structure for the conductor, and the accuracy of the current in the conductor measured by the measuring instrument is easily affected by the movement of the conductor. The following invention is now proposed:

[0006] A current transformer comprises a main shell, a main cover plate, and a positioning seat, wherein the main cover plate is fixedly mounted on the main shell, a first connecting hole and a second connecting hole are provided on the positioning seat, and a plurality of connecting columns which are arranged in a ring and vertically pass through the first connecting hole are provided on the main shell, a lower limit sleeve and an upper limit sleeve are threadedly connected to the connecting column, the lower limit sleeve abuts against the bottom of the positioning seat, and the upper limit sleeve abuts against the top of the positioning seat to fix the positioning seat on the connecting column, after the lower limit sleeve and the upper limit sleeve are vertically rotated along the connecting column, the positioning seat also moves vertically along the connecting column, the second connecting hole faces the center of the main shell, and a horizontal positioning rod is connected to its internal thread.

[0007] After the wire passes through the center of the main shell, the position of the positioning seat in the vertical direction can be adjusted by vertically rotating the lower limit sleeve along the connecting column. The positioning rod can then be screwed in horizontally to fix the wire. When the wire size is too small, the positioning seat can be adjusted to different heights to stagger the positioning rods to avoid adjacent positioning rods obstructing each other and affecting the fixation of the wire.

[0008] Furthermore, horizontally extending positioning arms are provided on both sides of the positioning seat, vertical first connecting holes are provided on the positioning arms, vertical positioning blocks are provided between the positioning arms, and horizontal second connecting holes are provided on the positioning blocks.

[0009] Furthermore, the lower limit sleeve is movably inserted into the first connecting hole, and a lower limit plate and a protrusion are respectively provided at the bottom and top of the lower limit sleeve. The lower limit plate is pressed against the bottom of the positioning arm, and the protrusion protrudes from the first connecting hole. An upper limit groove is also provided at the bottom of the upper limit sleeve to press against the top of the positioning arm, and the upper limit groove covers the outer side of the protrusion to separate the protrusion from the outside.

[0010] Furthermore, a rod cap is provided at one end of the positioning rod, a cross groove is provided on the side of the rod cap, and a fixing sleeve is threadedly connected to the other end, a fixed pressure plate is provided on the side of the fixing sleeve, and an annular plate is also provided on the main shell body. After the lower limit plate contacts the main shell body, the annular plate sleeve is arranged on the outside of the lower limit plate.

[0011] Furthermore, it also includes a fixing plate arranged on the side of the main housing, the fixing plate is provided with a matching hole, the main housing includes a first housing and a second housing, the side of the first housing is provided with a first matching block, the side of the second housing is provided with a second matching block, the first matching block and the second matching block are inserted into the matching hole together to fix the first housing and the second housing. The main housing is composed of the first housing and the second housing, which is convenient for the operator to sleeve the main housing on the outside of the wire.

[0012] Furthermore, a first matching groove is provided on the side of the first shell, a first matching block is provided in the first matching groove, a second matching groove is provided on the side of the second shell, a second matching block is provided in the second matching groove, and the first matching groove and the second matching groove are combined into a groove-shaped structure matching the fixed plate.

[0013] Furthermore, a fixing block is provided on the side of the first shell or the second shell, and a fixing belt mounted on the outside of the first shell and the second shell is fixedly connected to the fixing block. A limiting hole is also provided on the side of the fixing belt, and a limiting block is provided on the fixing plate to be inserted into the limiting hole. The fixing belt fixes the first shell and the second shell combination from the outside.

[0014] Furthermore, a rotating shaft and a locking groove are respectively provided at both ends of the fixing belt, and a movable plate is movably connected to the rotating shaft, and a locking hook is rotatably connected to the movable plate. After the locking hook is engaged in the locking groove, the first shell and the second shell are fixed from the outside. After the locking hook is pulled outward, the locking hook is disengaged from the locking groove, thereby releasing the fixing of the fixing belt to the first shell and the second shell.

[0015] The present invention proposes a current transformer, which has the beneficial effect that a positioning seat is provided on the main shell, and a positioning rod is provided on the positioning seat, wherein the positioning seat can adjust its vertical height relative to the main shell, and the positioning rod can rotate horizontally relative to the positioning seat. An operator can adjust the vertical height and horizontal position of the positioning rod according to the size of the wire to be fixed to achieve the purpose of fixing the wire. The present invention has a better effect of adapting and fixing wires of different sizes, especially small-sized wires. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The three-dimensional structure of the mutual inductor in the present invention is shown in FIG. Figure 1 ;

[0017] Figure 2 The three-dimensional structure of the mutual inductor in the present invention is shown in FIG. Figure 2 ;

[0018] Figure 3 It is a partial structural schematic diagram of the mutual inductor in the present invention;

[0019] Figure 4 It is a schematic diagram of the combined structure of the positioning seat and the lower limit sleeve in the present invention;

[0020] Figure 5 It is a schematic diagram of the three-dimensional structure of the lower limit sleeve in the present invention;

[0021] Figure 6 It is a schematic diagram of the three-dimensional structure of the upper limit sleeve in the present invention.

[0022] The corresponding relationship between the illustrations and component names in the figure is as follows:

[0023] 1. Main shell; 2. Main cover plate; 3. Positioning seat; 4. Positioning rod; 5. Lower limit sleeve; 6. Fixed plate; 7. Fixed belt; 11. First shell; 12. Second shell; 13. Connecting column; 14. Annular plate; 15. First matching groove; 16. First matching block; 17. Second matching groove; 18. Second matching block; 19. Fixed plug block; 31. Positioning arm; 32. First connecting hole; 33. Positioning block; 34. Second connecting hole; 41. Fixed sleeve; 42. Fixed pressure plate; 43. Cross groove; 44. Rod cap; 51. Lower limit plate; 52. Protrusion; 53. Upper limit sleeve; 54. Upper limit groove; 61. Matching hole; 62. Limit plug block; 71. Limit plug hole; 72. Engagement groove; 73. Rotating shaft; 74. Engagement hook; 75. Movable plate. DETAILED DESCRIPTION

[0024] The technical solution of the present invention will be clearly and completely described below in conjunction with embodiments.

[0025] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work should fall within the scope of protection of this application.

[0026] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so as to describe the embodiments of the present application described herein.

[0027] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0028] In addition to being used to indicate a position or location relationship, some of the above terms may also be used to indicate other meanings. For example, the term "on" may also be used to indicate a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in the present invention can be understood according to specific circumstances.

[0029] like Figure 1-Figure 4 As shown, it is a preferred embodiment of the present invention, a current transformer, including a main housing 1, a main cover 2, and a positioning seat 3, wherein the main cover 2 is fixedly mounted on the bottom of the main housing 1, and the positioning seat 3 is provided above the main housing 1 and is arranged in a ring shape. In this embodiment, the positioning seat 3 is provided with four, which are arranged at 90° intervals from each other, and horizontally extending positioning arms 31 are provided on both sides of the positioning seat 3, and vertically extending positioning blocks 33 are provided between the positioning arms 31, and a vertical first connecting hole 32 is provided on the positioning arm 31, and the positioning arm 31 is provided with a vertical first connecting hole 32. A horizontal second connecting hole 34 is provided on the positioning block 33, and a plurality of connecting columns 13 vertically passing through the first connecting hole 32 are fixedly provided on the top of the main shell 1, and a lower limit sleeve 5 and an upper limit sleeve 53 are also threadedly connected to the connecting column 13, wherein the lower limit sleeve 5 presses against the bottom of the positioning arm 31, and the upper limit sleeve 53 presses against the top of the positioning arm 31 to fix the positioning seat 3 on the connecting column 13, and a horizontal positioning rod 4 is threadedly connected in the second connecting hole 34, and the positioning rods 4 between the plurality of positioning seats 3 are also arranged in a ring shape.

[0030] A hole structure for the wire to pass through is provided at the center of the main shell 1. During installation, the lower limit sleeve 5 is first threadedly connected to the connecting column 13, and then the lower limit sleeve 5 is flexibly inserted into the first connecting hole 32. Then, the upper limit sleeve 53 is threadedly connected to the connecting column 13 and contacts with the positioning arm 31. The positioning seat 3 is fixed. After the positioning rod 4 has been threadedly connected to the second connecting hole 34, the positioning rod 4 is screwed in or out of the second connecting hole 34 according to the size of the wire. After multiple positioning rods 4 contact with the wire, the wire is fixed.

[0031] When the size of the wire is too small, the ends of the two adjacent positioning rods 4 will hinder each other after being screwed in, so that both sides cannot contact the wire, affecting the fixation of the wire. At this time, the upper limit sleeve 53 can be removed, and the vertical height of the positioning seat 3 can be changed by rotating the lower limit sleeve 5. Different positioning seats 3 make the positioning rods 4 staggered in the vertical direction, and the ends of the positioning rods 4 no longer hinder each other. In particular, since the positioning rods 4 spaced 180° apart do not hinder each other, the positioning rods 4 spaced 180° apart can be set to the same height, and the four positioning rods 4 form two groups of structures for clamping the wire.

[0032] like Figure 4-Figure 6 As shown, a lower limit plate 51 and a protrusion 52 are respectively provided at the bottom and top of the lower limit sleeve 5. After the lower limit sleeve 5 is inserted into the first connecting hole 32, the lower limit plate 51 presses against the bottom of the positioning arm 31. The protrusion 52 is in the shape of a hexagonal prism and protrudes upward from the top of the lower limit sleeve 5 to the first connecting hole 32. An upper limit groove 54 is provided at the bottom of the upper limit sleeve 53. After the upper limit sleeve 53 is threadedly connected to the connecting column 13, it presses against the top of the positioning arm 31. At this time, the upper limit groove 54 covers the outer side of the protrusion 52. In particular, the outer side of the upper limit sleeve 53 is also in the shape of a hexagonal prism. Using a tool matching the upper limit sleeve 53 or the protrusion 52, the upper limit sleeve 53 and the protrusion 52 can be controlled to be vertically screwed into the connecting column 13, thereby achieving the purpose of changing the vertical height of the positioning seat 3.

[0033] Furthermore, as shown in the figure, a rod cap 44 is provided at one end of the positioning rod 4, and a cross groove 43 is provided on the side of the rod cap 44, so as to facilitate the operator to screw the positioning rod 4 in or out, and the other end of the positioning rod 4 is threadedly connected with a fixing sleeve 41, and a fixed pressure plate 42 is provided on the side of the fixing sleeve 41 to increase the contact area with the wire; an annular plate 14 is also provided on the top of the main shell 1, and after the lower limit plate 51 contacts the main shell 1, the annular plate 14 is sleeved on the outside of the lower limit plate 51.

[0034] In this embodiment, if Figure 1-Figure 3As shown, two fixing plates 6 are further provided on the side of the main shell 1, and matching holes 61 are provided on the fixing plates 6. The main shell 1 includes a first shell 11 and a second shell 12 that are horizontally combined. The general cover plate includes two sub-cover plates that are respectively fixedly installed on the first shell 11 and the second shell 12. A first matching groove 15 is provided on the side of the first shell 11, and a first matching block 16 is provided in the first matching groove 15. A second matching groove 17 is provided on the side of the second shell 12, and a second matching block 18 is provided in the second matching groove 17.

[0035] like Figure 3 As shown, after the first shell 11 and the second shell 12 are combined, the first matching groove 15 and the second matching groove 17 are combined into a groove-shaped structure matched with the fixing plate 6, and the first matching block 16 and the second matching block 18 are fitted to each other and combined into a block-shaped structure that is inserted into the matching hole 61, so as to fix the first shell 11 and the second shell 12 to each other. After the fixing plate 6 is removed from the matching groove, the first shell 11 and the second shell 12 can be separated. The main shell 1 is set as the separated first shell 11 and the second shell 12, so that the operator can sleeve the main shell 1 on the outside of the wire.

[0036] Furthermore, if Figure 1 and Figure 2 As shown, a fixing block 19 is further provided on the side of the first shell 11, and a fixing belt 7 is fixedly connected to the fixing block 19. A fixing sleeve 41 of the fixing belt 7 is provided on the outside of the first shell 11 and the second shell 12 to fix the two together from the outside. A limiting hole 71 is also provided on the side of the fixing belt 7, and a limiting block 62 is provided on the fixing plate 6 to be inserted into the limiting hole 71, so as to improve the stability of the connection between the fixing belt 7 and the first shell 11 and the second shell 12.

[0037] Furthermore, a rotating shaft 73 and a locking groove 72 are respectively provided at both ends of the fixing belt 7, and a movable plate 75 is movably connected to the rotating shaft 73, and a locking hook 74 is rotatably connected to the movable plate 75. After the locking hook 74 is engaged in the locking groove 72, the fixing belt 7 is adhered and fixed to the outer sides of the first shell 11 and the second shell 12. After the locking hook 74 is pulled outward, the locking hook 74 is disengaged from the locking groove 72, thereby releasing the fixing combination of the fixing belt 7 on the first shell 11 and the second shell 12.

[0038] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A current transformer, comprising a main housing (1) and a main cover (2) mounted on the main housing (1), characterized in that: The invention also comprises a plurality of positioning seats (3) arranged in an annular pattern, wherein a first connecting hole (32) and a second connecting hole (34) are provided on the positioning seats (3), and a plurality of connecting posts (13) vertically passing through the first connecting holes (32) are fixedly provided on the main housing (1), and a lower limiting sleeve (5) and an upper limiting sleeve (53) are threadedly connected to the connecting posts (13), wherein the lower limiting sleeve (5) abuts against the bottom of the positioning seat (3), and the upper limiting sleeve (53) abuts against the top of the positioning seat (3) to fix the positioning seat (3) on the connecting posts (13), and after the lower limiting sleeve (5) and the upper limiting sleeve (53) are vertically rotated along the connecting posts (13), the positioning seat (3) also moves vertically along the connecting posts (13), and the second connecting holes (34) face the center of the main housing (1), and are internally threadedly connected to a horizontal positioning rod (4).

2. The current transformer according to claim 1, characterized in that: Horizontally extending positioning arms (31) are provided on both sides of the positioning seat (3), and vertical first connecting holes (32) are provided on the positioning arms (31). A vertical positioning block (33) is provided between the positioning arms (31), and horizontal second connecting holes (34) are provided on the positioning blocks (33).

3. The current transformer according to claim 2, characterized in that: The lower limit sleeve (5) is movably inserted into the first connection hole (32), and a lower limit plate (51) and a protrusion (52) are respectively provided at the bottom and top of the lower limit sleeve (5), wherein the lower limit plate (51) abuts against the bottom of the positioning arm (31), and the protrusion (52) protrudes from the first connection hole (32). An upper limit groove (54) is also provided at the bottom of the upper limit sleeve (53) and abuts against the top of the positioning arm (31), and the upper limit groove (54) covers the outer side of the protrusion (52).

4. The current transformer according to claim 3, characterized in that: One end of the positioning rod (4) is provided with a rod cap (44), a side of the rod cap (44) is provided with a cross groove (43), and the other end is threadedly connected with a fixing sleeve (41), a side of the fixing sleeve (41) is provided with a fixing pressure plate (42), and an annular plate (14) is also provided on the main housing (1), and after the lower limit plate (51) contacts the main housing (1), the annular plate (14) is sleeved on the outside of the lower limit plate (51).

5. The current transformer according to claim 1, characterized in that: The invention also comprises a fixing plate (6) arranged on the side of the main shell (1), wherein the fixing plate (6) is provided with a matching hole (61), wherein the main shell (1) comprises a first shell (11) and a second shell (12), wherein a first matching block (16) is provided on the side of the first shell (11), and a second matching block (18) is provided on the side of the second shell (12), wherein the first matching block (16) and the second matching block (18) are matched and inserted into the matching hole (61) together to fix the first shell (11) and the second shell (12) together.

6. The current transformer according to claim 5, characterized in that: A first matching groove (15) is provided on the side of the first shell (11), a first matching block (16) is provided in the first matching groove (15), a second matching groove (17) is provided on the side of the second shell (12), a second matching block (18) is provided in the second matching groove (17), and the first matching groove (15) and the second matching groove (17) are combined to form a groove-shaped structure matching the fixing plate (6).

7. The current transformer according to claim 6, characterized in that: A fixing plug (19) is also provided on the side of the first shell (11) or the second shell (12), and a fixing belt (7) sleeved on the outside of the first shell (11) and the second shell (12) is fixedly connected to the fixing plug (19), and a limiting plug hole (71) is also provided on the side of the fixing belt (7), and a limiting plug block (62) is provided on the fixing plate (6) and is inserted into the limiting plug hole (71).

8. The current transformer according to claim 7, characterized in that: The fixing belt (7) is provided with a rotating shaft (73) and a locking groove (72) at both ends thereof, the rotating shaft (73) is movably connected to a movable plate (75), the movable plate (75) is rotatably connected to a locking hook (74), the locking hook (74) is locked in the locking groove (72) to fix the first shell (11) and the second shell (12) from the outside, and the locking hook (74) is separated from the locking groove (72) when it is pulled outward.

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