Current transformer with magnetic isolation grooves

Abstract

The utility model belongs to the technical field of current transformers, and particularly relates to a current transformer with a magnetic isolation groove, which comprises a shell and an iron core, a secondary winding is arranged on one side of the iron core, a primary winding penetrates through a central hole of the shell, the magnetic isolation groove is arranged in the shell and positioned between the primary winding and the secondary winding, and the magnetic isolation groove is arranged in the iron core. The magnetic isolation grooves are filled with high-magnetic-resistance materials, the magnetic isolation grooves are formed between the primary winding and the secondary winding, magnetic fields of the primary winding and the secondary winding are effectively isolated, mutual interference of the two magnetic fields is reduced, and therefore the measurement precision of the current transformer is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of current transformers, and in particular relates to a current transformer with a magnetic isolation slot. Background Art

[0002] In the application of current transformers, measurement accuracy is one of the key indicators. Due to the electromagnetic interference between the primary winding and the secondary winding, it is difficult to completely isolate the influence of the magnetic field generated by the primary winding on the secondary winding in traditional designs, resulting in measurement errors.

[0003] For example, the current transformer with patent application number CN202322360624.1 includes a fixing mechanism, which includes a top plate, threaded rods are provided on both sides of the top plate, a bottom plate is provided at one end of the threaded rod, mounting grooves are provided on the top plate and the bottom plate, a main body device is provided in the mounting groove, a first thread groove is provided at both ends of the top plate and the bottom plate, a second thread groove is provided at both ends of the top plate and the bottom plate, a hand screw is provided in the second thread groove, and a buffer telescopic rod is provided at one end of the hand screw. However, the disadvantage of this technical solution is that electromagnetic interference is easily generated between the primary winding and the secondary winding, thereby affecting the measurement accuracy of the current transformer. Utility Model Content

[0004] The purpose of the utility model is to provide a current transformer with a magnetic isolation slot to solve the problems in the prior art. The specific technical solution is as follows:

[0005] A current transformer with a magnetic isolation groove comprises a shell and an iron core. A secondary winding is arranged on one side of the iron core, a primary winding passes through a central hole of the shell, a magnetic isolation groove is arranged in the shell, the magnetic isolation groove is located between the primary winding and the secondary winding, and the magnetic isolation groove is filled with high magnetic resistance material.

[0006] Furthermore, the shell includes an upper shell and a lower shell, both of which are provided with magnetic isolation grooves, four fixing columns are fixed to the edge of the lower shell, the four fixing columns are respectively threadedly connected with four screws, and the upper shell and the lower shell are buckled with each other.

[0007] Furthermore, a rubber pad 1 and a rubber pad 3 are provided between the upper shell and the lower shell, and a rubber pad 2 is provided between the upper shell, the lower shell and the iron core.

[0008] Furthermore, a plurality of reinforcing ribs 1 are provided on the periphery of the upper shell, and a plurality of reinforcing ribs 2 are provided on the periphery of the lower shell. The plurality of reinforcing ribs 1 correspond to the plurality of reinforcing ribs 2 one by one and are plugged into each other.

[0009] Furthermore, the upper shell is rotatably connected to a rotating rod, the rotating rod is fixedly connected to one end of a torsion spring, the other end of the torsion spring is fixed on the upper shell, the rotating rod is fixedly connected to the end of the pressure plate, and a plurality of grooves are provided on the pressure plate.

[0010] Furthermore, the upper shell and the lower shell are clamped with a wiring shell on their sides, the wiring shell is provided with slots on both upper and lower sides, the upper shell and the lower shell are provided with protrusions, the upper shell and the lower shell are provided with two baffles, the protrusions are embedded in the slots, and the two baffles are against both sides of the wiring shell.

[0011] Furthermore, terminals are fixed at both ends of the secondary winding, and the terminals are sleeved on the second rotating rod. The second rotating rod is rotatably connected to the wiring shell. A metal rod is also sleeved on the second rotating rod. One end of the metal rod is in contact with the terminal, and the other end of the metal rod is provided with a wiring hole.

[0012] Furthermore, a limit plate is fixed on the second rotating rod, the end of the limit plate is clamped with the metal rod, the second rotating rod is fixedly connected to one end of the second torsion spring, and the other end of the second torsion spring is fixed on the wiring shell.

[0013] Furthermore, the wiring housing is provided with two wire troughs.

[0014] Furthermore, both ends of the wiring shell are provided with fixing plates, and screw holes are provided on the fixing plates.

[0015] The advantages of the utility model are:

[0016] A magnetic isolation groove is provided between the primary winding and the secondary winding, and the magnetic isolation groove is filled with high magnetic resistance material. The high magnetic resistance material can be selected from calcium oxide, zinc oxide, magnesium oxide, etc. By providing a magnetic isolation groove between the primary winding and the secondary winding, the magnetic fields of the primary winding and the secondary winding are effectively isolated, and the mutual interference of the two magnetic fields is reduced, thereby improving the measurement accuracy of the current transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The overall structure of the utility model is shown in FIG. Figure 1 ;

[0018] Figure 2 The overall structure of the utility model is shown in FIG. Figure 2 ;

[0019] Figure 3 The overall structure of the utility model is shown in FIG. Figure 3 ;

[0020] Figure 4 The overall structure of the utility model is shown in FIG. Figure 4 ;

[0021] Figure 5 The overall structure of the utility model is shown in FIG. Figure 5 ;

[0022] Figure 6 This is a schematic diagram of the wiring housing structure of the utility model;

[0023] Figure 7This is a schematic diagram of the housing structure of the utility model;

[0024] Description of the markings in the figure:

[0025] Upper shell 1; reinforcing rib 1 2; lower shell 3; reinforcing rib 2 4; fixing column 5; screw 6; iron core 7; secondary winding 8; magnetic isolation groove 9; rubber pad 1 10; rubber pad 2 11; rubber pad 3 12; rotating rod 1 13; torsion spring 1 14; pressing plate 15; groove 16; terminal shell 17; slot 18; protrusion 19; baffle 20; terminal 21; rotating rod 2 22; limit plate 23; metal rod 24; torsion spring 2 25; wire groove 26; fixing plate 27. DETAILED DESCRIPTION

[0026] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments 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.

[0027] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0028] Embodiment 1

[0029] like Figure 1-7 As shown, a current transformer with a magnetic isolation slot comprises a shell and an iron core 7, a secondary winding 8 is arranged on one side of the iron core 7, a primary winding passes through the central hole of the shell, a magnetic isolation slot 9 is arranged in the shell, the magnetic isolation slot 9 is located between the primary winding and the secondary winding 8, and the magnetic isolation slot 9 is filled with a high magnetic resistance material;

[0030] The working principle of the above technical solution is as follows: a magnetic isolation groove 9 is provided between the primary winding and the secondary winding 8, and the magnetic isolation groove 9 is filled with high magnetic resistance material. The high magnetic resistance material can be selected from calcium oxide, zinc oxide, magnesium oxide, etc. By providing the magnetic isolation groove 9 between the primary winding and the secondary winding 8, the magnetic fields of the primary winding and the secondary winding 8 are effectively isolated, and the mutual interference between the two magnetic fields is reduced, thereby improving the measurement accuracy of the current transformer.

[0031] Embodiment 2

[0032] like Figure 1-7 As shown, the housing comprises an upper shell 1 and a lower shell 3, both of which are provided with magnetic isolation grooves 9, and four fixing columns 5 are fixed to the edge of the lower shell 3, and the four fixing columns 5 are respectively threadedly connected with four screws 6, and the upper shell 1 and the lower shell 3 are buckled with each other;

[0033] The working principle of the above technical solution: both the upper shell 1 and the lower shell 3 are provided with magnetic isolation grooves 9, and the magnetic isolation grooves 9 are filled with high magnetic resistance materials to effectively isolate the magnetic fields of the primary winding and the secondary winding 8. The four fixing columns 5 are threadedly connected with the four screws 6 respectively, and the upper shell 1 and the lower shell 3 are tightly buckled to form a chamber therein, and the iron core 7 and the secondary winding 8 are wrapped in the chamber.

[0034] Embodiment 3

[0035] like Figure 1-7 As shown, a rubber pad 10 and a rubber pad 3 12 are provided between the upper shell 1 and the lower shell 3, and a rubber pad 2 11 is provided between the upper shell 1 and the lower shell 3 and the iron core 7;

[0036] The working principle of the above technical solution is as follows: the rubber pad 10 can seal the high magnetic resistance material in the magnetic isolation groove 9, the rubber pad 3 12 can increase the sealing between the upper shell 1 and the lower shell 3, and the rubber pad 2 11 clamps the iron core 7 in the cavity formed by the upper shell 1 and the lower shell 3 to prevent the iron core 7 from shaking at will, thereby ensuring the stability of the overall structure.

[0037] Embodiment 4

[0038] like Figure 1-7 As shown, the outer periphery of the upper shell 1 is provided with a plurality of reinforcing ribs 1 2, and the outer periphery of the lower shell 3 is provided with a plurality of reinforcing ribs 2 4, and the plurality of reinforcing ribs 1 2 and the plurality of reinforcing ribs 2 4 correspond to each other one by one and are plugged into each other;

[0039] The working principle of the above technical solution is: multiple reinforcing ribs 1 2 can increase the structural strength of the upper shell 1, multiple reinforcing ribs 2 4 can increase the structural strength of the lower shell 3, and the reinforcing ribs 1 2 and the reinforcing ribs 2 4 are plugged into each other, which can increase the strength of the entire shell after the upper shell 1 and the lower shell 3 are buckled together.

[0040] Embodiment 5

[0041] like Figure 1-7 As shown, the upper shell 1 is rotatably connected to the rotating rod 13, the rotating rod 13 is fixedly connected to one end of the torsion spring 14, the other end of the torsion spring 14 is fixed on the upper shell 1, the rotating rod 13 is fixedly connected to the end of the pressure plate 15, and the pressure plate 15 is provided with a plurality of grooves 16;

[0042] The working principle of the above technical solution is as follows: in the initial state, the front end of the pressure plate 15 is against the upper shell 1, and the rotating rod 13 is rotated, which drives the torsion spring 14 to deform, and drives the pressure plate 15 to rotate. The front end of the pressure plate 15 is separated from the upper shell 1, and the primary winding can be placed between the upper shell 1 and the pressure plate 15. The control of the rotating rod 13 is released. Under the elastic force of the torsion spring 14, the rotating rod 13 is driven to rotate, and the pressure plate 15 is driven to rotate. The primary winding is squeezed between the pressure plate 15 and the upper shell 1, and the primary winding is located in the groove 16 on the pressure plate 15, thereby preventing the primary winding from moving arbitrarily in the center hole of the shell, causing the magnetic field to change arbitrarily, thereby affecting the measurement accuracy of the current transformer.

[0043] Embodiment 6

[0044] like Figure 1-7 As shown, the upper shell 1 and the lower shell 3 are clamped with a wiring shell 17 on the side, and the wiring shell 17 is provided with a clamping groove 18 on the upper and lower sides, and a convex block 19 is provided on the upper shell 1 and the lower shell 3, and two baffles 20 are provided on the upper shell 1 and the lower shell 3, and the convex block 19 is embedded in the clamping groove 18, and the two baffles 20 are against the two sides of the wiring shell 17;

[0045] The working principle of the above technical solution: the assembly process between the upper shell 1, the lower shell 3 and the wiring shell 17 is: put the wiring shell 17 on the lower shell 3, the slot 18 at the lower end of the wiring shell 17 and the protrusion 19 on the lower shell 3 are mutually embedded, and the two ends of the wiring shell 17 are against the two baffles 20 on the lower shell 3, and the upper shell 1 is buckled on the lower shell 3, the protrusion 19 on the upper shell 1 and the slot 18 at the upper end of the wiring shell 17 are mutually embedded, and the two baffles 20 on the upper shell 1 are against the two sides of the wiring shell 17, and the fixing column 5 is screwed and tightened with the screw 6, so as to firmly fix the upper shell 1, the lower shell 3 and the wiring shell 17 into a whole.

[0046] Embodiment 7

[0047] like Figure 1-7 As shown, terminals 21 are fixed at both ends of the secondary winding 8, and the terminal 21 is sleeved on a second rotating rod 22, and the second rotating rod 22 is rotatably connected to the wiring housing 17. A metal rod 24 is also sleeved on the second rotating rod 22, and one end of the metal rod 24 is in contact with the terminal 21, and the other end of the metal rod 24 is provided with a wiring hole;

[0048] The second rotating rod 22 is fixed with a limit plate 23, the end of the limit plate 23 is clamped with the metal rod 24, the second rotating rod 22 is fixedly connected with one end of the second torsion spring 25, and the other end of the second torsion spring 25 is fixed on the wiring housing 17;

[0049] The wiring housing 17 is provided with two wire slots 26;

[0050] The working principle of the above technical solution is: rotate the second rotating rod 22, the second rotating rod 22 and the wiring shell 17 rotate, drive the second torsion spring 25 to deform, drive the second rotating rod 22 and the terminal 21 to rotate, drive the limit plate 23 to rotate with the second rotating rod 22, the limit plate 23 pulls the metal rod 24 to rotate, the end of the metal rod 24 rotates to the outside of the wiring shell 17, the end of the metal rod 24 can be connected to the ammeter, after the limit is completed, release the control of the second rotating rod 22, under the elastic force of the second torsion spring 25, drive the second rotating rod 22, the limit plate 23 and the metal rod 24 to return to the initial state, the metal rod 24 and the ammeter terminal are hidden in the wiring shell 17, so as to prevent accidental contact with the metal rod 24 and its terminal;

[0051] The first rotating rod 13, the pressing plate 15, the second rotating rod 22 and the limiting plate 23 are all made of plastic materials, which are non-magnetic and non-conductive. The metal rod 24 is made of conductive material, such as iron or copper.

[0052] Embodiment 8

[0053] like Figure 1-7 As shown, the wiring housing 17 is provided with two wire slots 26;

[0054] Both ends of the wiring housing 17 are provided with fixing plates 27, and the fixing plates 27 are provided with screw holes;

[0055] The working principle of the above technical solution is: the screws are fixed to the preset position through the screw holes on the fixing plate 27, so that the current transformer as a whole can be fixed at the preset position, and the ammeter wires connected to the two metal rods 24 can be pulled out from the two wire slots 26 to prevent the ammeter wires from being squeezed.

[0056] It is understood that the present invention is described by some embodiments, and those skilled in the art are aware that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A current transformer with a magnetic isolation slot, characterized in that: The invention comprises a shell and an iron core (7), wherein a secondary winding (8) is arranged on one side of the iron core (7), a primary winding passes through a central hole of the shell, a magnetic isolation groove (9) is arranged in the shell, the magnetic isolation groove (9) is located between the primary winding and the secondary winding (8), and a high magnetic resistance material is filled in the magnetic isolation groove (9).

2. A current transformer with a magnetic isolation slot according to claim 1, characterized in that: The shell comprises an upper shell (1) and a lower shell (3), wherein both the upper shell (1) and the lower shell (3) are provided with a magnetic isolation groove (9), and four fixing columns (5) are fixed to the edge of the lower shell (3), and the four fixing columns (5) are respectively threadedly connected to four screws (6), and the upper shell (1) and the lower shell (3) are buckled with each other.

3. A current transformer with magnetic isolation slots according to claim 2, characterized in that: A rubber pad 1 (10) and a rubber pad 3 (12) are provided between the upper shell (1) and the lower shell (3), and a rubber pad 2 (11) is provided between the upper shell (1), the lower shell (3) and the iron core (7).

4. A current transformer with magnetic isolation slots according to claim 3, characterized in that: The outer periphery of the upper shell (1) is provided with a plurality of reinforcing ribs one (2), and the outer periphery of the lower shell (3) is provided with a plurality of reinforcing ribs two (4). The plurality of reinforcing ribs one (2) and the plurality of reinforcing ribs two (4) correspond one to one and are plugged into each other.

5. A current transformer with magnetic isolation slots according to claim 4, characterized in that: The upper shell (1) is rotatably connected to a rotating rod (13), the rotating rod (13) is fixedly connected to one end of a torsion spring (14), the other end of the torsion spring (14) is fixed to the upper shell (1), the rotating rod (13) is fixedly connected to the end of a pressure plate (15), and a plurality of grooves (16) are provided on the pressure plate (15).

6. A current transformer with magnetic isolation slots according to claim 5, characterized in that: The upper shell (1) and the lower shell (3) are clamped with a wiring shell (17) on their sides, the wiring shell (17) is provided with clamping grooves (18) on both upper and lower sides, the upper shell (1) and the lower shell (3) are provided with protrusions (19), the upper shell (1) and the lower shell (3) are provided with two baffles (20), the protrusions (19) are embedded in the clamping grooves (18), and the two baffles (20) are against both sides of the wiring shell (17).

7. A current transformer with magnetic isolation slots according to claim 6, characterized in that: Terminals (21) are fixed at both ends of the secondary winding (8), and the terminal (21) is sleeved on a second rotating rod (22). The second rotating rod (22) is rotatably connected to the wiring shell (17), and a metal rod (24) is sleeved on the second rotating rod (22). One end of the metal rod (24) contacts the terminal (21), and the other end of the metal rod (24) is provided with a wiring hole.

8. A current transformer with magnetic isolation slots according to claim 7, characterized in that: A limit plate (23) is fixed on the second rotating rod (22), the end of the limit plate (23) is clamped with the metal rod (24), the second rotating rod (22) is fixedly connected to one end of the second torsion spring (25), and the other end of the second torsion spring (25) is fixed on the wiring shell (17).

9. A current transformer with magnetic isolation slots according to claim 6, characterized in that: The wiring housing (17) is provided with two wire slots (26).

10. A current transformer with magnetic isolation slots according to claim 6, characterized in that: Both ends of the wiring shell (17) are provided with fixing plates (27), and screw holes are provided on the fixing plates (27).

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