Multi-layer laminated iron core structure for current transformer

Abstract

The multi-layer laminated iron core structure comprises a first high-permeability silicon steel sheet layer, a second high-permeability silicon steel sheet layer is arranged below the first high-permeability silicon steel sheet layer, the first high-permeability silicon steel sheet layer and the second high-permeability silicon steel sheet layer are stacked in a staggered mode, and the first high-permeability silicon steel sheet layer and the second high-permeability silicon steel sheet layer are stacked in a staggered mode. The first high-permeability silicon steel sheet layer is composed of a middle column and two side columns, the middle column and the side columns are of a vertical structure, and gaps are formed between the middle column and the side columns. According to the utility model, through the overlapping design of the E-shaped and strip-shaped high-permeability silicon steel sheets, the magnetic flux path is optimized, the magnetic conductivity is improved, the large-range eddy current path is blocked, the eddy current loss is reduced, and the energy loss is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a current transformer technical field, concretely to a multilayer lamination core structure for current transformer. BACKGROUND

[0002] The current transformer is a kind of electrical equipment that large current is transformed into small current according to certain proportion, and its main function is to provide small current signal proportional to primary side current for measuring instrument, relay protection device etc., to realize the monitoring, control and protection of power system.

[0003] The Chinese patent with CN203673924U discloses a current transformer core, including permalloy core and silicon steel core, the permalloy core and the silicon steel core are stacked together.The current transformer core according to the utility model is improved by using different materials according to the performance requirement of instrument to the transformer, the permalloy core and the silicon steel core are stacked and combined, the permalloy core is used to make the transformer angle difference small and linear degree good, the silicon steel core detects large current, and the current transformer core obtained by combining the advantages of the two can detect high current signal under the condition of small volume, and the precision angle difference and linear degree are good.

[0004] The above-mentioned current transformer core, although the permalloy core and the silicon steel core are stacked and combined, can detect high current signal, and the precision angle difference and linear degree are good, but it only stacks the permalloy core and the silicon steel core together, has the problems of weak magnetic flux transmission and large energy loss, more transverse leakage magnetic flux, affects permeability, large-range eddy current path is longer, and eddy current loss is larger, so we propose a multilayer lamination core structure for current transformer. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a multilayer lamination core structure for current transformer to solve the problems in the above background.

[0006] To achieve the above object, the utility model provides the following technical scheme: a multilayer lamination core structure for current transformer, including first high-permeability silicon steel sheet layer, the first high-permeability silicon steel sheet layer is provided with second high-permeability silicon steel sheet layer below, the first high-permeability silicon steel sheet layer and second high-permeability silicon steel sheet layer are staggered and stacked, the first high-permeability silicon steel sheet layer is composed of one middle column and two side columns, and the middle column and side column are vertical structures, and the middle column and side column are provided with interspace.

[0007] Preferably, the first high permeability silicon steel sheet layer is in an "E" shape, the second high permeability silicon steel sheet layer is in a long strip shape, and the second high permeability silicon steel sheet layer is closely attached to the first high permeability silicon steel sheet layer and covers the gap.

[0008] Preferably, the first high permeability silicon steel sheet layer and the second high permeability silicon steel sheet layer are stacked by rotating 180° layer by layer.

[0009] Preferably, the outer surface of the first high permeability silicon steel sheet layer is coated with a first insulating coating, the outer surface of the second high permeability silicon steel sheet layer is coated with a second insulating coating, and the first insulating coating and the second insulating coating are inorganic insulating paint.

[0010] Preferably, the thickness of the first high permeability silicon steel sheet layer is 0.3 mm, and the thickness of the second high permeability silicon steel sheet layer is 0.2 mm.

[0011] Preferably, the first high permeability silicon steel sheet layer is cold-rolled oriented silicon steel, and the second high permeability silicon steel sheet layer is non-oriented silicon steel.

[0012] Preferably, the first high permeability silicon steel sheet layer and the second high permeability silicon steel sheet layer are closely bonded by an adhesive layer, and the adhesive layer is epoxy resin.

[0013] Compared with the prior art, the utility model has the advantages that:

[0014] The first high permeability silicon steel sheet layer optimizes the magnetic flux path through three-column structure design, the second high permeability silicon steel sheet layer is in a long strip shape, the second high permeability silicon steel sheet layer covers the gap, the second high permeability silicon steel sheet layer assists the first high permeability silicon steel sheet layer to form a closed magnetic circuit, the magnetic force line is longitudinally transmitted along the middle column of the first high permeability silicon steel sheet layer, the second high permeability silicon steel sheet layer covers the gap of the first high permeability silicon steel sheet layer, the magnetic force line is transversely connected to the side columns on both sides through the second high permeability silicon steel sheet layer, forming a closed magnetic circuit, and the first insulating coating and the second insulating coating of the first high permeability silicon steel sheet layer and the second high permeability silicon steel sheet layer jointly cut off the transverse eddy current path; the first high permeability silicon steel sheet layer and the second high permeability silicon steel sheet layer are staggered and stacked, the magnetic circuit is uniformly distributed, the risk of local magnetic saturation is reduced, each layer of the first high permeability silicon steel sheet layer and the second high permeability silicon steel sheet layer is stacked by rotating 180°, the seams are staggered with adjacent layers, the magnetic circuit gap is eliminated, the magnetic permeability is improved, the large-range eddy current path is blocked, and the eddy current loss is reduced; the multi-layer laminated structure reduces the eddy current loss by blocking the eddy current path, the high resistivity of the silicon steel sheet further suppresses the eddy current, the magnetic hysteresis loss is significantly reduced due to the high magnetic permeability of the silicon steel sheet, and the overall efficiency is improved, so that the magnetic flux transmission can be optimized and the energy loss can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a schematic diagram of the three-dimensional structure of the present application;

[0016] Figure 2 is a schematic diagram of the side view structure of the present application;

[0017] Figure 3 is a schematic diagram of the Figure 2 is a schematic diagram of the enlarged structure at A in the middle;

[0018] Figure 4 is a schematic diagram of the top view structure of the first high permeability silicon steel sheet layer of the present application;

[0019] Figure 5 is a schematic diagram of the top view structure of the second high permeability silicon steel sheet layer of the present application.

[0020] In the figure: 1, first high permeability silicon steel sheet layer; 2, second high permeability silicon steel sheet layer; 3, adhesive layer; 4, intermediate column; 5, side column; 6, gap; 7, first insulating coating; 8, second insulating coating. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of the present application.

[0022] The technical scheme of the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of the present application.

[0023] Please refer to Figures 1-5 The present application provides an embodiment: a multi-layer laminated core structure for a current transformer, comprising a first high permeability silicon steel sheet layer 1, a second high permeability silicon steel sheet layer 2 arranged below the first high permeability silicon steel sheet layer 1, the first high permeability silicon steel sheet layer 1 and the second high permeability silicon steel sheet layer 2 being staggered and superimposed, the first high permeability silicon steel sheet layer 1 being composed of one intermediate column 4 and two side columns 5, the intermediate column 4 and the side columns 5 being vertical structures, and a gap 6 being arranged between the intermediate column 4 and the side columns 5.

[0024] Specifically, the multi-layer laminated core structure is mainly composed of a first high-permeability silicon steel sheet layer 1 and a second high-permeability silicon steel sheet layer 2, wherein the first high-permeability silicon steel sheet layer 1 is in the shape of "E", and the first high-permeability silicon steel sheet layer 1 is composed of one middle column 4 and two side columns 5, the side columns 5 are located on both sides of the middle column 4, the middle column 4 and the side columns 5 are in a vertical structure, and a gap 6 is arranged between the middle column 4 and the side columns 5, and the magnetic flux path is optimized through the three-column structure design;

[0025] The second high-permeability silicon steel sheet layer 2 is in a long strip structure, the second high-permeability silicon steel sheet layer 2 covers the gap 6, and the second high-permeability silicon steel sheet layer 2 assists the first high-permeability silicon steel sheet layer 1 to form a closed magnetic circuit, the magnetic force lines are transmitted longitudinally along the middle column 4 of the first high-permeability silicon steel sheet layer 1, the second high-permeability silicon steel sheet layer 2 covers the gap 6 of the first high-permeability silicon steel sheet layer 1, the magnetic force lines are connected transversely to the side columns 5 on both sides through the second high-permeability silicon steel sheet layer 2, a closed magnetic circuit is formed, and the first insulation coating 7 and the second insulation coating 8 of the first high-permeability silicon steel sheet layer 1 and the second high-permeability silicon steel sheet layer 2 jointly cut off the transverse eddy current path;

[0026] The first high-permeability silicon steel sheet layer 1 is in the shape of "E", the second high-permeability silicon steel sheet layer 2 is in a long strip structure, and the second high-permeability silicon steel sheet layer 2 is closely attached to the first high-permeability silicon steel sheet layer 1 and covers the gap 6;

[0027] The first high-permeability silicon steel sheet layer 1 and the second high-permeability silicon steel sheet layer 2 are stacked layer by layer with a rotation of 180°;

[0028] The multi-layer laminated core structure is composed of the first high-permeability silicon steel sheet layer 1 and the second high-permeability silicon steel sheet layer 2 which are stacked alternately, and the layers are stacked in the order of the first high-permeability silicon steel sheet layer 1-the second high-permeability silicon steel sheet layer 2-the first high-permeability silicon steel sheet layer 1-the second high-permeability silicon steel sheet layer 2, so that the magnetic circuit is evenly distributed and the risk of local magnetic saturation is reduced, and the first high-permeability silicon steel sheet layer 1 and the second high-permeability silicon steel sheet layer 2 are stacked layer by layer with a rotation of 180°, so that the seams are staggered with the adjacent layers, the magnetic circuit gap is eliminated, the magnetic permeability is improved, the large-scale eddy current path is blocked, and the eddy current loss is reduced;

[0029] The outer surface of the first high-permeability silicon steel sheet layer 1 is coated with the first insulation coating 7, and the outer surface of the second high-permeability silicon steel sheet layer 2 is coated with the second insulation coating 8, and the first insulation coating 7 and the second insulation coating 8 are inorganic insulation paint;

[0030] The thickness of the first high-permeability silicon steel sheet layer 1 is 0.3 mm, and the thickness of the second high-permeability silicon steel sheet layer 2 is 0.2 mm;

[0031] The first high-permeability silicon steel sheet layer 1 is cold-rolled oriented silicon steel, and the second high-permeability silicon steel sheet layer 2 is non-oriented silicon steel, which can reduce the cost.

[0032] The first high-permeability silicon steel sheet layer 1 and the second high-permeability silicon steel sheet layer 2 are tightly bonded by the adhesive layer 3, and the adhesive layer 3 is epoxy resin; after the lamination is completed, the adhesive layer 3 is bonded and fixed, ensuring the overall structural stability of the core;

[0033] The multi-layer lamination structure reduces the eddy current loss by blocking the eddy current path, and the high resistivity of the silicon steel sheet further suppresses the eddy current, and the magnetic hysteresis loss is significantly reduced due to the high magnetic permeability of the silicon steel sheet, which improves the overall efficiency, thereby optimizing the magnetic flux transmission and reducing energy loss. The structure is simple, low in cost and easy to mass produce. In addition, the lamination core can absorb part of the mechanical stress through elastic deformation to avoid core fracture and prolong the service life.

[0034] The embodiment of the application is used as follows: firstly, the multi-layer laminated core structure is mainly composed of a first high-permeability silicon steel sheet layer 1 and a second high-permeability silicon steel sheet layer 2, wherein the first high-permeability silicon steel sheet layer 1 is in the shape of an “E” character, the first high-permeability silicon steel sheet layer 1 is composed of one middle column 4 and two side columns 5, the side columns 5 are located on both sides of the middle column 4, the middle column 4 and the side columns 5 are in a vertical structure, a gap 6 is arranged between the middle column 4 and the side columns 5, and the magnetic flux path is optimized through the three-column structure design; secondly, the second high-permeability silicon steel sheet layer 2 is in a strip-shaped structure, the second high-permeability silicon steel sheet layer 2 covers the gap 6, and the second high-permeability silicon steel sheet layer 2 assists the first high-permeability silicon steel sheet layer 1 to form a closed magnetic circuit; the first high-permeability silicon steel sheet layer 1 is made of cold-rolled oriented silicon steel, and the second high-permeability silicon steel sheet layer 2 is made of non-oriented silicon steel, so that the cost can be reduced; the magnetic force lines are transmitted longitudinally along the middle column 4 of the first high-permeability silicon steel sheet layer 1, the second high-permeability silicon steel sheet layer 2 covers the gap 6 of the first high-permeability silicon steel sheet layer 1, the magnetic force lines are connected transversely to the side columns 5 on both sides through the second high-permeability silicon steel sheet layer 2, a closed magnetic circuit is formed, and the first insulation coating 7 and the second insulation coating 8 of the first high-permeability silicon steel sheet layer 1 and the second high-permeability silicon steel sheet layer 2 jointly cut off the transverse eddy current path; then, the multi-layer laminated core structure is composed of the first high-permeability silicon steel sheet layer 1 and the second high-permeability silicon steel sheet layer 2 which are staggered and superimposed in the order of the first high-permeability silicon steel sheet layer 1-the second high-permeability silicon steel sheet layer 2-the first high-permeability silicon steel sheet layer 1-the second high-permeability silicon steel sheet layer 2... so as to uniformly distribute the magnetic circuit, reduce the risk of local magnetic saturation, and superimpose each layer of the first high-permeability silicon steel sheet layer 1 and the second high-permeability silicon steel sheet layer 2 by 180° so as to stagger the seams with adjacent layers, eliminate the magnetic circuit gap, improve the magnetic permeability, block a wide range of eddy current paths, reduce the eddy current loss, and finally, the adhesive layer 3 is bonded and fixed after the lamination is completed, so as to ensure the stability of the overall structure of the core, the multi-layer laminated structure reduces the eddy current loss by blocking the eddy current path, the high electrical resistivity of the silicon steel sheet further inhibits the eddy current, the hysteresis loss is significantly reduced due to the high magnetic permeability of the silicon steel sheet, and the overall efficiency is improved, so that the magnetic flux transmission can be optimized and the energy loss can be reduced, the structure is simple, the cost is low, and the batch production is easy, in addition, the laminated core can absorb part of the mechanical stress through elastic deformation to avoid core fracture and prolong the service life.

[0035] Obviously, the above-described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the protection scope of the present application.

Claims

1. A multi-layer laminated core structure for a current transformer comprising a first layer of high permeability silicon steel sheets (1), characterized in that, The first high permeability silicon steel sheet layer (1) is provided below the second high permeability silicon steel sheet layer (2), the first high permeability silicon steel sheet layer (1) and the second high permeability silicon steel sheet layer (2) are staggered and superimposed, the first high permeability silicon steel sheet layer (1) is composed of one middle column (4) and two side columns (5), the middle column (4) and the side column (5) are vertical structures, and a gap (6) is arranged between the middle column (4) and the side column (5).

2. A multi-layer laminated core structure for a current transformer according to claim 1, characterized in that: The first high permeability silicon steel sheet layer (1) is in an "E" shape, the second high permeability silicon steel sheet layer (2) is in a long strip structure, and the second high permeability silicon steel sheet layer (2) is closely attached to the first high permeability silicon steel sheet layer (1) and covers the gap (6).

3. A multi-layer laminated core structure for a current transformer according to claim 1, characterized in that: The first high permeability silicon steel sheet layer (1) and the second high permeability silicon steel sheet layer (2) are superimposed by rotating 180° layer by layer.

4. A multi-layer laminated core structure for a current transformer according to claim 1, characterized in that: The outer surface of the first high permeability silicon steel sheet layer (1) is coated with a first insulating coating (7), the outer surface of the second high permeability silicon steel sheet layer (2) is coated with a second insulating coating (8), and the first insulating coating (7) and the second insulating coating (8) are inorganic insulating paint.

5. A multi-layer laminated core structure for a current transformer as claimed in claim 1, characterized in that: The thickness of the first high permeability silicon steel sheet layer (1) is 0.3mm, and the thickness of the second high permeability silicon steel sheet layer (2) is 0.2mm.

6. A multi-layer laminated core structure for a current transformer according to claim 1, characterized in that: The first high permeability silicon steel sheet layer (1) is cold-rolled oriented silicon steel, and the second high permeability silicon steel sheet layer (2) is non-oriented silicon steel.

7. A multi-layer laminated core structure for a current transformer as claimed in claim 1, characterized in that: The first high permeability silicon steel sheet layer (1) and the second high permeability silicon steel sheet layer (2) are closely bonded by an adhesive layer (3), and the adhesive layer (3) is epoxy resin.

Images