WO2021248795A1

WO2021248795A1 - Iron core disc for iron core reactor

Info

Publication number: WO2021248795A1
Application number: PCT/CN2020/127409
Authority: WO
Inventors: 禹云长; 禹东泽
Original assignee: 吴江变压器有限公司
Priority date: 2020-06-09
Filing date: 2020-11-09
Publication date: 2021-12-16
Also published as: CN111524690A

Abstract

An iron core disc for an iron core reactor comprises an iron core disc body (1). The iron core disc body (1) comprises a silicon steel sheet (3). An inner insulation cylinder (10) is provided at an inner annular portion of the iron core disc body (1). An insulation layer (13), semi-conducting paper (14) and an insulation binding tape (15) are sequentially provided in an outward direction at an outer annular portion of the iron core disc body (1). A ground wire (7) is provided at the outer annular portion of the iron core disc body (1). One side of the ground wire (7) is inserted into the iron core disc body (1), and the other side thereof is in contact with the semi-conducting paper (14). The insulation layer (13) is provided with a gap for providing clearance for the ground wire (7). Multiple iron core disc bodies (1) are stacked to form a cylindrical core. The ground wires (7) of the iron core disc bodies (1) adjacent in a vertical direction are connected to each other. The ground wire (7) of the uppermost iron core disc body (1) is connected to a ground connector. The ground connector is connected to a ground potential. The height of each of the insulation layer (13), the semi-conducting paper (14) and the insulation binding tape (15) is not greater than the height of the iron core disc body.

Description

Iron core reactor

Technical field

The invention relates to an iron core cake, in particular to an iron core reactor iron cake.

Background technique

The body structure of the iron core reactor in the prior art is generally: a series of iron core cakes are stacked to form a core column, which is surrounded by oil channels, ground screens, insulation, and coils in sequence. The iron core cake is generally formed by stacking silicon steel sheets with gradually varying lengths into a fan shape, and a plurality of fan-shaped parts form a cylindrical shape. Face in and out, thereby reducing loss and avoiding overheating, the disadvantage is that it is inconvenient to achieve grounding. In order to achieve reliable grounding and ensure that all silicon steel sheets are free of potential suspension, a ground shield tube for grounding is arranged on the periphery of the stem, and this zero-potential ground shield tube is used to cover the entire stem to realize the grounding of the stem. Between the outer diameter of the stem and the inner diameter of the ground screen, the oil passage or air passage is supported by a brace curtain to facilitate the heat dissipation of the stem. The distance between the outer circumference of the ground screen and the inner circumference of the winding is the radial insulation distance. Therefore, in order to realize the grounding of the core column, the distance between the winding and the core column has to be increased, which results in increased loss, higher cost, and more complicated structure. The key factors are the core cake structure, craftsmanship and grounding method.

Summary of the invention

The invention provides an iron core reactor iron core cake, which has high reliability, simple structure, low total loss and high heat dissipation efficiency of the core column.

The working principle of the present invention: an iron core reactor iron core cake, including an iron core cake body; the iron core cake body includes silicon steel sheets; the inner ring of the iron core cake body is provided with an inner insulating tube; the iron core cake body outer ring is composed of An insulating layer, a semiconductor paper, and an insulating binding tape are arranged in order from the inside to the outside; a ground wire is arranged on the outer ring of the iron core cake body; one side of the ground wire is embedded in the iron core cake body, and the other side is in contact with the semiconductor paper; The insulating layer is provided with a gap to avoid the grounding wire.

Further, a plurality of core cake bodies are stacked into a core column, and the ground wires of the upper and lower core cake bodies are connected to each other; the ground wire of the uppermost core cake body is connected to a ground connector, and the ground connector is connected to the ground potential connect.

Further, the height of the insulating paper, semiconductor paper and insulating binding tape are not higher than the height of the core cake body.

The beneficial effects of the present invention are: since the ground screen composed of semiconductor paper and grounding wire is contained in the iron core cake, it replaces the independent ground shield cylinder, and keeps the insulation distance (the distance between the winding and the core column) unchanged. Under the premise, the winding diameter becomes smaller, and the loss and cost are reduced;

Due to the insulating layer between the outer diameter of the core cake body and the semiconductor paper, only at the ground wire, the ground wire is in close contact with the silicon steel sheet and the semiconductor paper to form an electrical same potential, while the other parts on the circumference are insulated The layer separates the silicon steel sheet from the semiconductor paper, which prevents the semiconductor paper from short-circuiting all silicon steel sheets in the same iron core cake, improves reliability and reduces loss;

Since the height of the semiconductor paper, insulating paper or insulating film, and insulating band of each iron core cake is equal to or slightly smaller than the height of the silicon steel sheet, the semiconductor paper forms a shield for the silicon steel sheet. After grounding through the grounding wire, the iron core cake has its own ground shield , So that the ground screen of the stem is not only thin, but also segmented in height, exposing the air gap, reducing oil resistance for oil-immersed products or airflow resistance for dry products, and improving heat dissipation capacity;

Since the iron core cake is used to replace the independent ground screen tube in the prior art, the heat dissipation condition of the core column is greatly improved, the eddy current generated by the main magnetic flux bypass is greatly reduced, and the shielding loss is reduced.

Description of the drawings

Figure 1 is a schematic diagram of the structure of the iron core cake;

Figure 2 is a schematic cross-sectional view of the iron core cake;

Figure 3 is a schematic diagram of the iron core reactor structure.

The marks in the figure are: 1. Iron core cake body; 3. Silicon steel sheet; 7. Grounding wire; 8. Main tunnel insulation layer; 9. Winding; 10. Inner insulation cylinder; 13. Outer insulation layer; 14. Semiconductor paper; 15. Insulation lashing tape; 16. Iron yoke.

detailed description

In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. The embodiments are only used to explain the present invention and do not limit the protection scope of the present invention.

An iron core reactor iron core cake, including an iron core cake body 1; the iron core cake body 1 includes silicon steel sheets 3; the inner ring of the iron core cake body 1 is provided with an inner insulating cylinder 10; the outer ring of the iron cake body 1 is formed by An insulating layer 13, a semiconductor paper 14, and an insulating binding band 15 are arranged in order from the inside to the outside; a ground wire 7 is arranged on the outer ring of the iron core cake body 1; one side of the ground wire 7 is embedded in the iron cake body 1, and the other side It is in contact with the semiconductor paper 14; the insulating layer 13 is provided with a gap for avoiding the grounding wire 7; a plurality of core cake bodies 1 are stacked into a core column, and the ground wires 7 of the upper and lower adjacent core cake bodies 1 are connected to each other; the uppermost layer A grounding connector is connected to the ground wire 7 of the iron core cake body 1, and the ground connection head is connected to the ground potential; the height of the insulating paper 13, the semiconductor paper 14 and the insulating binding band 15 are not higher than the height of the iron cake body 1 .

The iron core cake includes the inner insulating cylinder 10, the silicon steel sheet 3, the insulating layer 13, the grounding wire 7, the semiconductor paper 14, and the insulating band 15, which are made of epoxy resin 4; pad insulation between the iron core cake body and the semiconductor paper 14 Layer 13, so that only at the grounding wire 7, the grounding wire 7 is in close contact with the silicon steel sheet 3 and the semiconductor paper 14 to form an electrical same potential, while in other parts of the circumference, the insulating layer 13 separates the silicon steel sheet 3 and the semiconductor paper 14 ; The height of the semiconductor paper 14, the insulating layer 13, and the insulating band 15 of each iron core cake is equal to or slightly less than the height of the silicon steel sheet 3. The semiconductor paper 14 forms a shield for the silicon steel sheet 3, and the semiconductor paper is connected to the ground through the ground wire 7. 14 plays the role of the ground shielding layer, replacing the independent ground shielding cylinder, making the thickness of the core column thinner, and keeping the insulation distance (the distance between the core column and the winding 9) unchanged, the winding can be reduced 9 diameter, reduce loss and cost.

The foregoing embodiments should not limit the present invention in any way, and all technical solutions obtained by equivalent substitution or equivalent conversion fall within the protection scope of the present invention.

Claims

An iron core reactor iron core cake, characterized in that it includes an iron core cake body (1); the iron core cake body (1) includes silicon steel sheets (3); the inner ring of the iron core cake body (1) is provided with internal insulation Tube (10); the outer ring of the iron core cake body (1) is sequentially provided with an insulating layer (13), semiconductor paper (14) and an insulating binding band (15) from the inside to the outside; the iron cake body (1) outside The ring is provided with a grounding wire (7); one side of the grounding wire (7) is embedded in the core cake body (1), and the other side is in contact with the semiconductor paper (14); the insulating layer (13) is provided with avoiding grounding Gap in line (7).
The iron core reactor iron core cake according to claim 1, characterized in that: a plurality of iron core cake bodies (1) are stacked to form a core column, and the ground wires (7) of the upper and lower adjacent iron core cake bodies (1) are connected to each other ; The ground connection (7) of the core cake body (1) of the uppermost layer is connected to a ground connection, and the ground connection is connected to the ground potential.
The iron core reactor iron core cake according to claim 1, characterized in that the heights of the insulating paper (13), semiconductor paper (14) and insulating binding tape (15) are not higher than the height of the iron core cake body (1). )the height of.