CN115763007A - Dry-type iron core reactor core column grounding method - Google Patents
Dry-type iron core reactor core column grounding method Download PDFInfo
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- CN115763007A CN115763007A CN202211553344.6A CN202211553344A CN115763007A CN 115763007 A CN115763007 A CN 115763007A CN 202211553344 A CN202211553344 A CN 202211553344A CN 115763007 A CN115763007 A CN 115763007A
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Abstract
The invention belongs to the field of dry-type iron core reactor manufacturing, and relates to a dry-type iron core reactor core column grounding method, wherein a grounding sheet is uniformly welded on a grounding lead, and an insulating layer is wrapped on the periphery of the grounding lead; fixedly mounting an insulating cylinder, stacking silicon steel sheets on the periphery of the insulating cylinder to form an iron core cake, penetrating one end of a grounding lead into the insulating cylinder, and inserting a grounding sheet into a gap of the silicon steel sheets through a notch of the insulating cylinder; an air gap cushion block is bonded between two adjacent iron core cakes through resin glue, and the air gap cushion blocks are bonded on the outer side surfaces of the iron core cakes at the two ends through the resin glue respectively; and carrying out vacuum resin pouring on the grounding sheet along with the iron core cake, and leading out the other end of the grounding lead from the upper end part of the core column and fixedly connecting the grounding lead with a grounding system of the clamping piece. The invention can effectively avoid the partial discharge phenomenon caused by grounding at the outer diameter side of the iron core cake, can reduce the distance between the inner diameter side of the coil and the core column, reduces the diameter of the coil, and has positive effects of reducing the loss of the coil and reducing the manufacturing cost.
Description
Technical Field
The invention belongs to the field of dry-type iron core reactor manufacturing, and relates to a dry-type iron core reactor core column grounding method.
Background
The reactor is used as important power equipment in a power system and mainly plays roles in limiting short-circuit current, compensating capacitive current, filtering, smoothing and the like. The dry iron core reactor has the characteristics of small volume, high mechanical strength, high flame retardant property, simple and convenient operation and maintenance and the like, and is widely applied to the fields of urban power transmission and transformation systems, railway electrical networks, metallurgy and the like.
The dry-type iron core reactor mainly comprises an iron core and a coil. In the prior art, two general methods for grounding the iron core of the dry iron core reactor are provided: one is to adopt a zero potential ground screen cylinder to cover the whole core column, the ground screen cylinder is connected with an iron core clamping piece through a grounding wire, and the core column is grounded through a point grounding system of the iron core clamping piece. A certain gap is reserved between the ground screen cylinder and the core column, so that the core column is ensured to radiate smoothly. In order to secure the insulation distance between the outer diameter side of the ground shield and the inner diameter side of the coil, the distance between the core column and the inner diameter side of the coil needs to be increased, so that the diameter of the coil is increased, the loss is increased, and the manufacturing cost is increased correspondingly. In order to meet the noise requirement, the ground screen cylinder needs to be fixed firmly, so that the internal structure is complex and the assembly is difficult. The other is to connect a plurality of iron core cakes in the core column together in series by adopting an equipotential line mode. The grounding wire is embedded in the outer diameter side of the iron core cake, two adjacent iron core cakes in the core column are connected through the grounding wire on the outer diameter side, and finally the iron core cakes are connected with the iron core clamp grounding system through the end part iron core cake grounding wire, so that the core column is grounded. Since the grounding wire is positioned on the outer diameter side of the iron core cake and between the inner diameter side of the coil and the core column, partial discharge is easy to occur. In order to secure the insulation distance, the distance between the core leg and the inner diameter side of the coil needs to be increased, which also increases the loss and increases the manufacturing cost.
Disclosure of Invention
Aiming at the technical problem, the invention provides a dry-type iron core reactor core column grounding method, which adopts the following technical scheme:
a dry-type iron core reactor core column grounding method comprises the following steps:
and 5, leading out the other end of the grounding lead from the upper end part of the core column and fixedly connecting the other end of the grounding lead with a grounding system of the clamping piece.
Preferably, in step 1, the length of the grounding sheet is determined according to the radial size of the iron core cake, the length of the grounding lead is selected according to the height and the number of the iron core cake, the grounding sheet is welded on the grounding lead in advance, the welding part is polished smooth, and the grounding lead is firmly wrapped by an F-grade alkali-free glass ribbon to be used as an insulating layer.
Preferably, the grounding piece is made of a tinned copper sheet, and the grounding lead is a soft copper stranded wire.
Preferably, in step 2, the insulating cylinder is placed in place before the iron core cakes are stacked, the insulating cylinder is provided with openings according to the width and the thickness of the grounding piece, and the openings of the insulating cylinder are larger than the width and the thickness of the grounding piece.
Preferably, the insulating cylinder is made of an F-level epoxy plate.
Preferably, the length of the grounding sheet inserted into the iron core cake is 1/3 of the radial dimension of the iron core cake, and the length of the grounding sheet extending out of the inner diameter side of the iron core cake is less than 10mm.
Preferably, the gap of the insulating cylinder is sealed by glue in advance before the iron core cake is poured.
Preferably, in step 3, the thickness of the air gap cushion block between the two iron core cakes is larger than that of the air gap cushion block on the outer side surfaces of the two iron core cakes.
The invention has the beneficial effects that:
according to the invention, the grounding pieces are embedded in the inner diameter side of the iron core cake, the grounding pieces are connected together through the grounding wires, and the grounding wires are led out from the end part of the core column and connected with the clamping piece grounding system, so that the core column is grounded. The core column grounding method can effectively avoid the partial discharge phenomenon caused by grounding at the outer diameter side of the iron core cake, and can reduce the distance between the inner diameter side of the coil and the core column, so that the diameter of the coil is reduced, and the core column grounding method has positive effects of reducing the loss of the coil and reducing the manufacturing cost. The grounding structure has the advantages of reasonable design, good reliability, simple process and popularization and application value.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are specific embodiments of the invention, and that other drawings within the scope of the present application can be obtained by those skilled in the art without inventive effort.
FIG. 1 is a flowchart illustrating steps of a method for fabricating a grounding structure according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a stem grounding structure according to an embodiment of the present invention;
fig. 3 is a top view of a stem grounding structure according to an embodiment of the present invention;
fig. 4 is a partial cross-sectional view of a stem grounding structure of an embodiment of the present invention;
the grounding device comprises an iron core cake 1, an iron core cake 2, an air gap cushion block 3, an insulating cylinder 4, a grounding lead 5 and a grounding sheet.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention.
Fig. 1 is a flowchart illustrating steps of a method for fabricating a grounding structure according to an embodiment of the present invention. A dry-type iron core reactor core column grounding method comprises the following steps:
the length of a grounding piece 5 is determined according to the radial size of an iron core cake 1, one iron core cake 1 is correspondingly inserted with one grounding piece 5, a grounding lead 4 with a proper length is selected according to the height and the number of the iron core cakes 1, the grounding piece 5 is welded on the grounding lead 4 in advance, the welding part is polished smooth, and the grounding lead 4 is firmly wrapped by an F-grade alkali-free glass ribbon to be used as an insulating layer.
The grounding piece 5 is made of a tinned copper sheet, and the grounding lead 4 is a soft copper stranded wire.
And 2, fixedly installing an insulating cylinder 3, stacking silicon steel sheets at the periphery of the insulating cylinder 3 to form an iron core cake 1, wherein the side wall of the insulating cylinder 3 is provided with a plurality of through openings, one end of a grounding lead 4 penetrates into the insulating cylinder 3, and a grounding sheet 5 penetrates through the openings of the insulating cylinder 3 and is inserted into gaps of the silicon steel sheets.
Before the iron core cakes 1 are stacked, the insulating cylinder 3 needs to be placed in place, and the insulating cylinder 3 needs to be provided with openings according to the width and the thickness of the grounding piece 4. The opening of the insulating cylinder 3 is generally slightly larger than the width and the thickness of the grounding sheet 5, the opening is not too large, and resin adhesive is prevented from flowing into the insulating cylinder 3 during vacuum pouring.
The insulating cylinder 3 is made of an F-level epoxy plate.
The iron core cake 1 is formed by stacking silicon steel sheets in a fan shape. In the silicon steel sheet stacking process, a grounding sheet 5 is inserted into a silicon steel sheet gap on the inner diameter side of an iron core cake 1, the length of the grounding sheet 5 inserted into the iron core cake 1 is generally 1/3 of the radial dimension of the iron core cake 1, and the length of the grounding sheet 5 extending out of the inner diameter side of the iron core cake 1 is generally less than 10mm.
And 3, the core column is formed by stacking a plurality of iron core cakes 1, an air gap cushion block 2 is bonded between two adjacent iron core cakes 1 through resin glue, and the air gap cushion blocks 2 are bonded on the outer side surfaces of the iron core cakes 1 at two ends through resin glue respectively.
The thickness of the air gap cushion block 2 between the two iron core cakes 1 is larger than that of the air gap cushion block 2 on the outer side surface of the iron core cake 1 at two ends, and the difference in thickness at the position is a design principle of an air gap of a core column of a reactor product, so that the air gap height is convenient to adjust.
And 4, finally, carrying out vacuum resin casting on the grounding piece 5 along with the iron core cake 1 to form a whole, so that the grounding piece 5 is embedded on the inner diameter side of the iron core cake 1.
The opening of the insulating cylinder 3 needs to be sealed by glue in advance before the iron core cake 1 is poured, so that resin glue is prevented from flowing into the insulating cylinder 3 during vacuum pouring.
In the stacking process of the iron core cakes 1, the grounding lead 4 at the lower iron core cake 1 is compacted after the upper iron core cake 1 is stacked.
And 5, leading out the other end of the grounding lead wire 4 from the upper end part of the core column and fixedly connecting the other end of the grounding lead wire with a grounding system of the clamping piece to realize the grounding of the core column.
Thus, a plurality of cast iron core cakes 1 are piled up into a whole to form a dry iron core reactor core column, and the core column ensures reliable and safe grounding.
Fig. 2 is a schematic diagram of a core grounding structure according to an embodiment of the present invention; fig. 3 is a top view of a grounding structure of a stem according to an embodiment of the present invention; fig. 4 is a partial cross-sectional view of a grounding structure of a stem according to an embodiment of the present invention. In the embodiment of the invention, the whole core column is connected with the iron core cakes 1 in series in sequence on the inner diameter side of the iron core cake 1 through the grounding lead 4 positioned in the insulating cylinder 3, and finally, the core column is fixedly connected with a grounding system of an iron core clamping piece, so that the reliable grounding of the core column is realized.
In the embodiments of the present invention, technical features that are not described in detail are all related art or conventional technical means, and are not described herein again.
Finally, it is to be noted that: the above examples are only specific embodiments of the present invention, and are not intended to limit the technical solutions of the present invention, and the scope of the present invention is not limited thereto. Those skilled in the art will understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein.
Claims (8)
1. A dry-type iron core reactor core column grounding method is characterized by comprising the following steps:
step 1, designing and determining the lengths of a grounding lead (4) and a grounding piece (5), uniformly welding the grounding piece (5) on the grounding lead (4), and wrapping an insulating layer on the periphery of the grounding lead (4);
step 2, fixedly installing an insulating cylinder (3), stacking silicon steel sheets on the periphery of the insulating cylinder (3) to form an iron core cake (1), wherein the side wall of the insulating cylinder (3) is provided with a plurality of through notches, one end of a grounding lead (4) penetrates into the insulating cylinder (3), and a grounding sheet (5) penetrates through the notches of the insulating cylinder (3) and is inserted into gaps of the silicon steel sheets;
step 3, bonding air gap cushion blocks (2) between two adjacent iron core cakes (1) through resin glue, and bonding the air gap cushion blocks (2) on the outer side surfaces of the iron core cakes (1) at two ends through the resin glue respectively;
step 4, finally, carrying out vacuum resin pouring on the grounding sheet (5) along with the iron core cake (1) to finally form a whole;
and 5, leading out the other end of the grounding lead (4) from the upper end part of the core column and fixedly connecting the grounding lead with a grounding system of the clamping piece.
2. The grounding method for the dry-type iron-core reactor core column according to the claim 1 is characterized in that in the step 1, the length of the grounding sheet (5) is determined according to the radial dimension of the iron core cake (1), the length of the grounding lead (4) is selected according to the height and the number of the iron core cake (1), the grounding sheet (5) is welded on the grounding lead (4) in advance, the welding position is polished smooth, and the grounding lead (4) is firmly wrapped by an F-grade alkali-free glass ribbon to be used as an insulating layer.
3. The grounding method for the dry-type iron-core reactor core column according to claim 2, characterized in that the grounding sheet (5) is made of tinned copper sheet, and the grounding lead (4) is a soft copper stranded wire.
4. The grounding method for the dry-type iron-core reactor core column according to claim 1, characterized in that in step 2, the insulation cylinder (3) is put in place before the iron core cakes (1) are stacked, the insulation cylinder (3) is opened according to the width and thickness of the grounding sheet (4), and the opening of the insulation cylinder (3) is larger than the width and thickness of the grounding sheet (5).
5. A dry-type iron-core reactor core grounding method as claimed in claim 4, characterized in that the insulation cylinder (3) is made of F-class epoxy plate.
6. A dry-type iron-core reactor core column grounding method as claimed in claim 5, characterized in that the length of the grounding piece (5) inserted into the iron core cake (1) is 1/3 of the radial dimension of the iron core cake (1), and the length of the grounding piece (5) extending out of the inner diameter side of the iron core cake (1) is less than 10mm.
7. A dry-type iron-core reactor core column grounding method as claimed in claim 6, characterized in that the gaps of the insulating cylinder (3) are sealed with glue in advance before the iron core cake (1) is poured.
8. The method for grounding the core column of the dry-type iron-core reactor according to claim 1, wherein in the step 3, the thickness of the air-gap cushion block (2) between the two iron core cakes (1) is larger than the thickness of the air-gap cushion blocks (2) on the outer side surfaces of the iron core cakes (1) at the two ends.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211553344.6A CN115763007A (en) | 2022-12-02 | 2022-12-02 | Dry-type iron core reactor core column grounding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211553344.6A CN115763007A (en) | 2022-12-02 | 2022-12-02 | Dry-type iron core reactor core column grounding method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115763007A true CN115763007A (en) | 2023-03-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211553344.6A Pending CN115763007A (en) | 2022-12-02 | 2022-12-02 | Dry-type iron core reactor core column grounding method |
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|---|---|
| CN (1) | CN115763007A (en) |
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- 2022-12-02 CN CN202211553344.6A patent/CN115763007A/en active Pending
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