Current transformer with shielding winding

Abstract

The utility model discloses a current transformer with a shielding winding, which comprises a current transformer main body, a secondary winding, an iron core and a primary winding, the iron core is arranged in the current transformer main body, the primary winding is uniformly wound at one end of the iron core, the secondary winding is uniformly wound at the other end of the iron core, and the secondary winding is wound at the other end of the iron core. A shielding winding main body is wound on the outer side of the primary winding, the shielding winding main body is composed of a main copper wire and an auxiliary copper wire, the outer side of the shielding winding main body is wrapped with an aluminum foil layer, and a panel is arranged on one side of the current transformer main body. According to the current transformer, the current transformer body, the primary winding, the shielding winding body, the secondary winding and the iron core are installed, compared with a shielding cover needing to be additionally installed and fixed, and the shielding winding body serves as a part of an electromagnetic element, the installation and maintenance process of the current transformer is simpler and more convenient, the operation difficulty and cost are reduced, and the maintainability of equipment is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of current transformers, in particular to a current transformer with a shielding winding. Background Technique

[0002] A current transformer is an instrument that converts a large current on the primary side into a small current on the secondary side for measurement, and has a wide range of applications in the power system, including various links such as power generation, transformation, transmission, distribution, and power consumption.

[0003] A current transformer generally consists of a closed iron core and windings. The primary winding has fewer turns and is connected in series in the circuit where the current to be measured passes through. The secondary winding has more turns and is connected in series in the measuring instrument and the protection circuit. When there is a current flowing through the primary winding, a magnetic field will be generated in the iron core, and this magnetic field will pass through the secondary winding, thereby inducing a current signal proportional to the primary current in the secondary winding. In order to reduce the influence of electromagnetic interference and conductive interference on the measurement accuracy, appropriate shielding measures need to be taken. For example, the fixed structure of the current transformer coil shielding cylinder for high-voltage combined electrical appliances disclosed in the patent number CN218730357U uses a multi-turn through-core small transformation ratio current transformer, and the shielding effect is ensured by adding a shielding cover. However, since this structure adds external accessories, it is not conducive to miniaturization and light weight. Content of the Utility Model

[0004] The purpose of the utility model is to provide a current transformer with a shielding winding to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A current transformer with a shielding winding includes a current transformer main body, a secondary winding, an iron core, and a primary winding. The iron core is arranged inside the current transformer main body, and one end of the iron core is evenly wound with a primary winding, and the other end of the iron core is evenly wound with a secondary winding. A shielding winding main body is wound outside the primary winding, and the shielding winding main body is composed of a main copper wire and a secondary copper wire. An aluminum foil layer is wrapped outside the shielding winding main body. A panel is arranged on one side of the current transformer main body.

[0006] Preferably, reserved holes are opened around the side of the current transformer main body close to the panel, mounting holes are arranged at the four corners of the panel, and the mounting holes and the reserved holes are connected by fasteners.

[0007] Preferably, both sides inside the current transformer main body are evenly connected to the iron core through support bodies, and the support bodies are made of rubber material.

[0008] Preferably, slots are provided on the current transformer main body on both sides of the reserved hole, and insertion blocks matching the slots are provided on the periphery of the panel.

[0009] Preferably, bushing sleeves are provided at the central positions inside the support bodies, and core columns are embedded inside the bushing sleeves.

[0010] Preferably, cavities are provided around the inner periphery of the support bodies, and the cavities are distributed in a concentric circle structure around the core column.

[0011] Preferably, connecting plates are provided at both ends of the support body, and the connecting plates are respectively connected to the iron core and the inner side wall of the current transformer main body.

[0012] Preferably, there is 1 group of main copper wires and 6 groups of secondary copper wires, and the secondary copper wires are all arranged around the main copper wires.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows: The current transformer with a shielding winding is provided with a current transformer main body, a primary winding, a shielding winding main body, a secondary winding and an iron core. The shielding winding main body is arranged outside the primary winding. The shielding winding main body is composed of main copper wires and secondary copper wires, which has good electrical conductivity and magnetic shielding performance, can effectively absorb and disperse the magnetic field, and effectively reduce the influence of the magnetic field generated by the primary current on the secondary winding and the measurement circuit. Compared with the shielding cover that needs to be installed and fixed additionally, the shielding winding main body, as a part of the electromagnetic element, has a simpler installation and maintenance process, reduces the operation difficulty and cost, improves the maintainability of the equipment. There are 6 groups of secondary copper wires arranged around the main copper wires, which improves the structural strength of the shielding winding main body. And a copper foil layer is wound outside the shielding winding main body, further improving the shielding performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0015] Figure 1 It is a front view sectional structure schematic diagram of the present utility model;

[0016] Figure 2 It is for the Figure 1 enlarged structure schematic diagram at A in;

[0017] Figure 3 It is a sectional structure schematic diagram of the shielding winding main body of the present utility model;

[0018] Figure 4 Schematic cross-sectional structure diagram of the support body of the present utility model;

[0019] Figure 5 Top view structure diagram of the present utility model.

[0020] In the figure: 1, main body of current transformer; 2, secondary winding; 3, iron core; 4, reserved hole; 5, support body; 6, slot; 7, primary winding; 8, main body of shielding winding; 9, main copper wire; 10, auxiliary copper wire; 11, aluminum foil layer; 12, bushing; 13, core column; 14, cavity; 15, panel; 16, insertion block; 17, mounting hole; 18, connecting plate. Specific embodiments

[0021] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0022] Please refer to Figures 1-5 , an embodiment provided by the present utility model: A current transformer with a shielding winding includes a main body 1 of the current transformer, a secondary winding 2, an iron core 3, and a primary winding 7. An iron core 3 is arranged inside the main body 1 of the current transformer, and a primary winding 7 is evenly wound around one end of the iron core 3, and a secondary winding 2 is evenly wound around the other end of the iron core 3. A main body 8 of the shielding winding is wound outside the primary winding 7;

[0023] Moreover, the main body 8 of the shielding winding is composed of a main copper wire 9 and an auxiliary copper wire 10, has good electrical conductivity and magnetic shielding performance, can effectively absorb and disperse the magnetic field, and effectively reduce the influence of the magnetic field generated by the primary current on the secondary winding 2 and the measurement circuit;

[0024] Compared with the shielding cover that needs to be additionally installed and fixed, the main body 8 of the shielding winding, as a part of the electromagnetic element, is more convenient in the installation and maintenance process, reduces the operation difficulty and cost, and improves the maintainability of the equipment;

[0025] An aluminum foil layer 11 is wrapped outside the main body 8 of the shielding winding, which can further improve the shielding performance;

[0026] One group of main copper wires 9 is provided, and six groups of auxiliary copper wires 10 are provided, and the auxiliary copper wires 10 are all arranged around the main copper wire 9, which improves the structural strength of the main body 8 of the shielding winding and makes it not easy to break and damage;

[0027] Both sides inside the main body 1 of the current transformer are evenly connected to the iron core 3 through a support body 5, and the support body 5 is made of rubber material;

[0028] Connecting plates 18 are respectively arranged at both ends of the support body 5, and the connecting plates 18 are respectively connected to the inner side walls of the iron core 3 and the current transformer main body 1;

[0029] It can reduce the displacement and deformation of the iron core 3 under the action of vibration or impact, and protect the stable operation of the current transformer main body 1;

[0030] Bushing sleeves 12 are respectively arranged at the central positions inside the support body 5, and core columns 13 are embedded inside the bushing sleeves 12, which can increase the structural strength of the support body 5 itself;

[0031] Preferably, cavities 14 are respectively arranged around the inside of the support body 5, and the cavities 14 are distributed in a concentric circle structure around the core column 13, so that the support body 5 can bear multi-directional loads and improve the support and buffering effects;

[0032] A panel 15 is arranged on one side of the current transformer main body 1. Reserved holes 4 are respectively arranged around the side of the current transformer main body 1 close to the panel 15. Mounting holes 17 are respectively arranged at the four corners of the panel 15, and the mounting holes 17 and the reserved holes 4 are respectively connected by fasteners, which is convenient for overhaul and maintenance;

[0033] Slot grooves 6 are respectively arranged on the current transformer main body 1 on both sides of the reserved holes 4. Insert blocks 16 matched with the slot grooves 6 are respectively arranged around the panel 15. When the panel 15 is connected to the current transformer main body 1, the insert blocks 16 are connected to the slot grooves 6, which increases the sealing performance.

[0034] Working principle: When the embodiment of the present application is in use, the shielding winding main body 8 is arranged outside the primary winding 7. The shielding winding main body 8 is composed of a main copper wire 9 and a secondary copper wire 10, and has good electrical conductivity and magnetic shielding performance. It can effectively absorb and disperse the magnetic field, and effectively reduce the influence of the magnetic field generated by the primary current on the secondary winding 2 and the measurement circuit. Compared with the shielding cover that needs to be additionally installed and fixed, the shielding winding main body 8 is a part of the electromagnetic element, and its installation and maintenance processes are simpler, reducing the operation difficulty and cost, and improving the maintainability of the equipment. The secondary copper wire 10 is provided with 6 groups and is arranged around the main copper wire 9, which improves the structural strength of the shielding winding main body 8. And an aluminum foil layer 11 is wound outside the shielding winding main body 8, which can further improve the shielding performance. Support bodies 5 are arranged on both sides of the iron core 3. The support bodies 5 are made of rubber material, which can reduce the displacement and deformation of the iron core 3 under the action of vibration or impact, and protect the stable operation of the current transformer main body 1. Bushing sleeves 12 are respectively arranged at the central positions inside the support bodies 5, and core columns 13 are embedded in the bushing sleeves 12, which can increase the structural strength of the support bodies 5 themselves.

[0035] Obviously, the above-described embodiments are only some of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

Claims

1. A current transformer with shielded winding, characterized in that: The invention comprises a current transformer body (1), a secondary winding (2), an iron core (3) and a primary winding (7), wherein the iron core (3) is arranged inside the current transformer body (1), and the primary winding (7) is evenly wound around one end of the iron core (3), and the secondary winding (2) is evenly wound around the other end of the iron core (3), a shielding winding body (8) is wound around the outside of the primary winding (7), and the shielding winding body (8) is composed of a main copper wire (9) and a secondary copper wire (10), and the outside of the shielding winding body (8) is wrapped with an aluminum foil layer (11), and a panel (15) is arranged on one side of the current transformer body (1).

2. A current transformer with shielded winding according to claim 1, characterized in that: The current transformer body (1) is provided with reserved holes (4) on all sides of a side close to the panel (15), and mounting holes (17) are provided at four corners of the panel (15), and the mounting holes (17) are connected to the reserved holes (4) via fasteners.

3. A current transformer with shielded winding according to claim 1, characterized in that: Both sides of the interior of the current transformer body (1) are evenly connected to the iron core (3) via a support body (5), and the support body (5) is made of rubber material.

4. A current transformer with shielded winding according to claim 2, characterized in that: Slots (6) are provided on the current transformer body (1) on both sides of the reserved hole (4), and plug-in blocks (16) matching the slots (6) are provided around the panel (15).

5. A current transformer with shielded winding according to claim 3, characterized in that: A pipe sleeve (12) is provided at a central position inside the support body (5), and a core column (13) is embedded inside the pipe sleeve (12).

6. A current transformer with shielded winding according to claim 5, characterized in that: The support body (5) is provided with cavities (14) on all four sides thereof, and the cavities (14) are distributed in a concentric circle structure around the core column (13).

7. A current transformer with shielded winding according to claim 3, characterized in that: Connecting plates (18) are respectively provided at both ends of the support body (5), and the connecting plates (18) are respectively connected to the iron core (3) and the inner side wall of the current transformer body (1).

8. The current transformer with shielded winding according to claim 1, characterized in that: One group of the main copper wires (9) is provided, and six groups of the auxiliary copper wires (10) are provided, and the auxiliary copper wires (10) are all provided around the main copper wires (9).

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