CN112967876A - Cylindrical coil grading interlayer insulation structure and winding method thereof - Google Patents

Abstract

The invention discloses a cylinder type coil grading interlayer insulation structure and a winding method thereof. Only one layer insulation is needed, and only one layer insulation of one specification needs to be blanked, so that blanking workload is reduced, and material utilization rate and working efficiency are improved; when single-layer insulation is wound, the interlayer insulation structure is simplified, the winding is convenient, the layer insulation placing efficiency and the coil winding efficiency are improved, and the batch production and the production cost are reduced; the single-layer insulation arrangement is favorable for controlling the flatness of the insulation end face and the layer insulation end face of the coil after the coil is wound, so that the coil is more compact and attractive, and the stress performance and the short-circuit resistance of the coil are improved.

Description

Cylindrical coil grading interlayer insulation structure and winding method thereof

Technical Field

The invention relates to the technical field of power transmission and distribution, in particular to a cylindrical coil grading interlayer insulation structure. In addition, the invention also relates to a winding method of the cylinder type coil grading interlayer insulation structure for the cylinder type coil grading interlayer insulation structure.

Background

The transformer cylindrical coil layer is provided with interlayer insulation consisting of a plurality of layers of insulation, and the number of the layer insulation is determined according to the highest working voltage between two adjacent layers of coils.

When the number of layer insulators of the interlayer insulation exceeds 4, in order to reduce the radial size of the coil and improve the heat dissipation performance, the layer insulators are generally placed in stages, that is, about half of the layer insulators in the interlayer insulation are long (referred to as long insulation for short) and about half of the layer insulators in the interlayer insulation are short (referred to as short insulation for short). When the number of coil layers is odd, the interlayer insulation is in long-short matching and is symmetrically arranged up and down, as shown in fig. 1; when the number of the coil layers is even, in order to enable the coil to have a smooth appearance, the insulation between the outermost layers is long insulation, and the rest insulation between the layers are arranged in the room in a vertically symmetrical mode in a length matching mode.

Because the layer that is equipped with two kinds of specifications is insulating, need two kinds promptly during the unloading, not only increase work load, still can reduce material utilization, increase extravagant. Meanwhile, when the coil is wound, long insulation and short insulation need to be alternately placed, the operation is frequent, the number and the positions of the long insulation and the short insulation need to be calibrated all the time, errors are easy to occur during the placement, and the winding efficiency is low.

In addition, the phenomena of multiple layers of insulation irregularity and exceeding of the end face of the coil can occur after the coil is wound, and the attractiveness of the coil is affected.

In summary, how to improve the winding efficiency of the coil is a problem to be solved urgently by those skilled in the art.

Disclosure of Invention

In view of the above, an object of the present invention is to provide a hierarchical interlayer insulation structure for a cylindrical coil, which only uses one layer insulation, reduces the blanking workload and the production cost, and improves the coil winding efficiency and the coil performance.

In addition, the invention also provides a winding method of the cylindrical coil grading interlayer insulation structure for the cylindrical coil grading interlayer insulation structure.

In order to achieve the above purpose, the invention provides the following technical scheme:

the utility model provides a hierarchical interlaminar insulation system of drum formula coil, includes a plurality of layers of coil and set up in oil duct between the coil, adjacent two-layerly all be equipped with a plurality of parallel layer insulations between the coil, the length of layer insulation with the height of coil is the same, layer insulation includes the process of bending in coil height center department the layer insulation of bending of coil.

Preferably, the bending layer insulation bending passes through the upper part of the even-numbered coil, or the bending layer insulation bending passes through the lower part of the odd-numbered coil.

Preferably, the midpoint of the layer insulation is located at the center of the height of the coil.

Preferably, the length of both ends of the layer insulation from the coil edge is 2 mm.

Preferably, the layer insulation comprises cable paper and mylar insulation paper.

A method for winding a cylindrical coil with a hierarchical interlayer insulation structure comprises,

step S0: n is 1;

step S1: when the nth layer coil is an odd layer coil, winding the nth layer coil downwards, placing 1 insulating layers, raising the layer to the (n + 1) th layer, placing b1 insulating layers at the height center of the coil wound upwards to the (n + 1) th layer, enabling b1 insulating layers to pass through the position above the (n + 1) th layer to the position between the (n + 1) th layer and the (n + 2) th layer, placing c1 insulating layers, raising the layer to the (n + 2) th layer and entering the step S2, wherein a1, b1 and c1 are positive integers;

when the nth layer coil is an even number coil, winding the nth layer coil upwards, placing c2 pieces of layer insulation, raising the layer to the (n + 1) th layer, placing b2 pieces of layer insulation at the height center of the coil wound downwards to the (n + 1) th layer, enabling b2 pieces of layer insulation to pass through the position above the (n + 1) th layer to the position between the (n + 1) th layer and the (n + 2) th layer, placing a2 pieces of layer insulation, raising the layer to the (n + 2) th layer, and entering the step S2, wherein a2, b2 and c2 are positive integers;

step S2: and (3) N is N +2, or after the N +2 th layer of coil is wound, placing the oil channel and raising the layer to the N +3 th layer, and circulating the step S1 until the winding of the Nth layer of coil is completed, wherein N is the total number of layers of the coil.

Preferably, a1 ═ a2, b1 ═ b2, and c1 ═ c 2.

Preferably, a1 ═ c1 ═ 4, and b1 ═ 2.

The invention provides a hierarchical interlayer insulation structure of a cylindrical coil, which is wound according to an interlayer insulation hierarchical placement design drawing of the coil during winding, wherein the coils are sequentially wound during winding, a plurality of parallel layer insulations are placed among the coils, and when the coils and the layer insulations are positioned at the same azimuth angle of the cylindrical coil, the layer insulations pass through the coils and separate two adjacent layers of coils in a bending layer insulation mode.

Taking the winding of the interlayer insulation structure between the coil of the 1 st layer and the coil of the 3 rd layer as an example, firstly winding the coil of the 1 st layer and placing the required layer insulation; lifting the layer to the 2 nd layer, placing the required bending layer insulation when winding the layer to the height center of the coil of the 2 nd layer coil, bending the bending layer insulation at the midpoint to enable the bending layer insulation to wind the bending layer insulation above the 2 nd layer coil and enter one side of the 2 nd layer coil, which is far away from the 1 st layer coil; and raising the layer to the 3 rd layer, placing the required layer of insulation, and descending to wind the 3 rd layer of coil.

Only one layer insulation is needed, so that only one specification of layer insulation needs to be blanked when the coil is wound, blanking workload is reduced, and material utilization rate and working efficiency are improved; when single-layer insulation is wound, the interlayer insulation structure is simplified, the winding is convenient, the layer insulation placing efficiency and the coil winding efficiency are improved, and the batch production and the production cost are reduced; the single-layer insulation arrangement is favorable for controlling the flatness of the insulation end face and the layer insulation end face of the coil after the coil is wound, so that the coil is more compact and attractive, and the stress performance and the short-circuit resistance of the coil are improved.

In addition, the invention also provides a winding method of the cylindrical coil grading interlayer insulation structure comprising the cylindrical coil grading interlayer insulation structure.

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 is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a cylindrical coil hierarchical interlayer insulation structure in the prior art;

FIG. 2 is a schematic structural diagram of an embodiment of a cylindrical coil grading interlayer insulation structure provided in the present invention;

fig. 3 is a schematic diagram illustrating the hierarchical placement of the interlayer insulation of the cylindrical coil hierarchical interlayer insulation structure according to the present invention.

In fig. 1-3:

01 is coil, 02 is layer insulation, 03 is oil duct; the number corresponding to the lower part of the coil is the layer number of the coil, and the number between two adjacent layers of coils represents the number of layer insulation.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The core of the invention is to provide a hierarchical interlayer insulation structure of a cylindrical coil, only one layer of insulation is used, the blanking workload and the production cost are reduced, and the coil winding efficiency and the coil performance are improved.

In addition, the invention also provides a winding method of the cylindrical coil grading interlayer insulation structure for the cylindrical coil grading interlayer insulation structure.

Referring to fig. 1-3, fig. 1 is a schematic structural diagram of a cylindrical coil hierarchical interlayer insulation structure in the prior art; FIG. 2 is a schematic structural diagram of an embodiment of a cylindrical coil grading interlayer insulation structure provided in the present invention; fig. 3 is a schematic diagram illustrating the hierarchical placement of the interlayer insulation of the cylindrical coil hierarchical interlayer insulation structure according to the present invention.

The invention provides a cylinder type coil grading interlayer insulation structure which comprises a plurality of layers of coils 01 and an oil passage 03 arranged between the coils 01, wherein a plurality of parallel layer insulations 02 are arranged between every two adjacent layers of coils 01, the length of each layer insulation 02 is the same as the height of each coil 01, and each layer insulation 02 comprises a bending layer insulation which is bent at the height center of each coil and passes through the corresponding coil 01.

Referring to fig. 2, 5 layers of insulation 02 completely positioned at the left side of the layer 2 coil 01 are arranged in parallel along the axial direction of the cylindrical coil; the 4 layers of insulation 02 completely positioned on the right side of the 2 nd layer coil 01 are arranged in parallel along the axial direction of the cylindrical coil; 2 layers of insulation 02 which is positioned on the same azimuth angle of the cylindrical coil with the 2 nd layer coil 01 intersect with the 2 nd layer coil 01 at the height center of the coil, and the 2 layers of insulation 02 are bent layer insulation.

The material, the type and the size of the layer insulation 02 are determined according to the type, the size, the layer number and other factors of the cylindrical coil in actual production, and the quantity of the layer insulation 02 is determined according to the voltage gradient between the two adjacent layers of coils 01.

In order to avoid the layer insulation 02 from protruding beyond the insulation end faces of the coil 01, it is preferable that the center point of the layer insulation 02 is located at the center of the height of the coil, so that the layer insulation 02 is distributed symmetrically with respect to the center plane of the height of the cylindrical coil.

Preferably, the lengths of both ends of the layer insulation 02 from the edge of the coil 01 are both 2mm, so as to avoid the layer insulation 02 from exceeding the insulation end face of the coil 01 and reduce the waste of insulation material.

It should be noted that the reserved lengths of the two ends of the layer insulation 02 and the edge of the coil 01 are not fixed values, and may be adjusted and determined according to factors such as the height of the cylindrical coil in actual production.

Considering that the winding directions of the odd-numbered layer coil and the even-numbered layer coil are different, referring to fig. 1, it is preferable that the bending layer insulation bend passes above the even-numbered layer coil or the bending layer insulation bend passes below the odd-numbered layer coil so as to perform winding of the hierarchical interlayer insulation structure.

When winding, the coil 01 is wound according to the interlayer insulation hierarchical placement design drawing of the coil 01, the coil 01 is sequentially wound when winding, a plurality of parallel layer insulators 02 are placed between the coil 01, and when the coil 01 and the layer insulators 02 are positioned at the same azimuth angle of the cylindrical coil, the layer insulators 02 pass through the coil 01 in a mode of bending the layer insulators 02 and separate the two adjacent layers of coils 01.

Referring to fig. 2, taking the winding of the inter-layer insulation structure between the 1 st layer coil 01 and the 3 rd layer coil 01 as an example, the 1 st layer coil 01 is wound first, and the required layer insulation 02 is placed; lifting the layer to the 2 nd layer, winding the layer upwards to the height center of the coil 01 of the 2 nd layer, placing the required bending layer insulation, bending the bending layer insulation at the midpoint of the bending layer insulation to enable the bending layer insulation to pass through the upper part of the coil 01 of the 2 nd layer and enter one side of the coil 01 of the 2 nd layer, which is far away from the coil 01 of the 1 st layer; and (4) ascending to the 3 rd layer, placing the required layer insulation 02, and descending to wind the 3 rd layer coil 01.

In the embodiment, only one layer insulation 02 is needed, and only one specification of layer insulation 02 needs to be blanked when the coil 01 is wound, so that blanking workload is reduced, and material utilization rate and working efficiency are improved; when the single-layer insulation 02 is wound, the interlayer insulation structure is simplified, the winding is convenient, the layer insulation 02 placing efficiency and the coil winding efficiency are improved, and the batch production and the production cost are reduced; the single-layer insulation 02 is favorable for controlling the flatness of the insulation end face of the coil 01 and the end face of the layer insulation 02 after the coil 01 is wound, so that the coil 01 is more compact and attractive, and the stress performance and the short-circuit resistance of the coil 01 are improved.

Preferably, the layer insulation 02 includes cable paper and polyester film insulation paper, and the type of the layer insulation 02 is determined by factors such as the size of the cylindrical coil and the voltage gradient between layers.

In addition to the above hierarchical insulation structure between cylinder type coil layers, the present invention also provides a method for winding a hierarchical insulation structure between cylinder type coils including the hierarchical insulation structure between cylinder type coil layers disclosed in the above embodiments, including,

step S0, n is 1;

step S1: when the nth layer coil 01 is an odd-numbered coil, winding the nth layer coil 01 downwards, placing 1 insulating layers 02, raising the layer to the (n + 1) th layer, placing b1 insulating layers 02 at the height center of the (n + 1) th layer coil 01 wound upwards, enabling b1 insulating layers 02 to pass through the position above the (n + 1) th layer to the position between the (n + 1) th layer and the (n + 2) th layer, placing c1 insulating layers 02, raising the layer to the (n + 2) th layer and entering the step S2, wherein a1, b1 and c1 are positive integers;

when the nth layer coil 01 is an even number coil, winding the nth layer coil 01 upwards, placing c2 insulating layers 02, raising the layers to the (n + 1) th layer, placing b2 insulating layers 02 at the height center of the (n + 1) th layer coil 01, enabling b2 insulating layers 02 to pass through the position above the (n + 1) th layer to the position between the (n + 1) th layer and the (n + 2) th layer, placing a2 insulating layers 02, raising the layers to the (n + 2) th layer and entering the step S2, wherein a2, b2 and c2 are positive integers;

step S2: and (3) N is equal to N +2, or after the N +2 th layer of coil 01 is wound, placing the oil channel 03 and raising the layer to the N +3 th layer, and repeating the step S1 until the winding of the N-th layer of coil 01 is completed, wherein N is the total number of layers of the coil.

It should be noted that in step S1, the number of the layer insulators 02 during the winding process, i.e., a1, b1, c1, a2, b2, and c2, is determined according to the voltage gradient of the corresponding adjacent two-layer coil 01. In actual production, in order to facilitate winding of coil 01, preferably, a1 ═ a2, b1 ═ b2, and c1 ═ c2 may be provided, that is, the number of layer insulations 02 between mth layer coil 01 and m +2 th layer coil 01 is kept constant, where m is any positive integer not greater than N, and no oil passage 03 is provided between mth layer coil 01 and m +2 th layer coil 01.

Referring to fig. 2 and 3, preferably, a1 ═ c1 ═ 4 and b1 ═ 2 can be provided, the insulating properties of the layer insulation 02 are good and the number of layer insulations 02 required is relatively small.

Taking the hierarchical layer structure between the coil 01 of the 1 st layer and the coil 01 of the 6 th layer in fig. 3 as an example, the coil 01 of the 1 st layer is wound downwards at first; placing 5 layers of insulation 02 and raising the layers to the 2 nd layer; when the 2 nd layer coil 01 is wound upwards to the height center of the coil, 2 layers of insulation 02 are placed to be bent to pass above the 2 nd layer coil 01, and then the 2 nd layer coil 01 is wound; 4 layers of insulation 02 are placed, the layers are lifted to the 3 rd layer, and the 3 rd layer coil 01 is wound downwards; placing an oil duct 03, lifting the oil duct to the 4 th layer, and winding a 4 th layer coil 01 upwards; 4 layers of insulation 02 are placed, and the layers are lifted to the 5 th layer; when the 5 th layer coil 01 is wound downwards to the height center of the coil, 2 layers of insulation 02 are placed to be bent to pass below the 5 th layer coil 01, and then the 5 th layer coil 01 is wound; 4 layers of insulation 02 are placed, and the layers are lifted to the 6 th layer, and the 6 th layer coil 01 is wound upwards.

It should be noted that in step S2, in order to ensure the heat dissipation performance of the bobbin coil, the opening directions of the two adjacent oil passages 03 are different, and the structure, size, and pitch of the oil passages 03 are determined according to factors such as the design size of the bobbin coil.

Preferably, in order to further enhance the insulating capability, one or more layers of insulation 02 may be added before the 1 st and 2 nd layers of coils 01 and the N-1 st and N-1 th layers of coils 01, where N is the total number of coils, as shown in fig. 3.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The present invention provides a cylindrical coil grading interlayer insulation structure and a winding method thereof. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims (8)

1. The utility model provides a hierarchical interlaminar insulation system of drum formula coil, includes a plurality of layers of coil (01) and set up in oil duct (03) between coil (01), adjacent two-layer all be equipped with a plurality of parallel layer between coil (01) and insulate (02), its characterized in that, the length of layer insulation (02) with the height of coil (01) is the same, layer insulation (02) include at coil height center department bend the process the layer insulation of bending of coil (01).

2. The cylindrical coil grading interlayer insulation structure according to claim 1, wherein the bending layer insulation bend passes above even-numbered coils or the bending layer insulation bend passes below odd-numbered coils.

3. The cylindrical coil grading interlayer insulation structure according to claim 2, characterized in that the midpoint of the layer insulation (02) is located at the coil height center.

4. The cylindrical coil grading interlayer insulation structure according to claim 2, characterized in that both ends of the layer insulation (02) are 2mm in length from the edge of the coil (01).

5. Hierarchical layer insulation structure of the cylindrical coil according to any of claims 1-4, characterized in that the layer insulation (02) comprises cable paper and mylar insulation paper.

6. A method for winding a cylindrical coil with a hierarchical interlayer insulation structure is characterized by comprising the following steps,

step S0: n is 1;

step S1: when the nth layer coil (01) is an odd-numbered layer coil, winding the nth layer coil (01) downwards, placing a1 pieces of layer insulation (02), raising the layer to the (n + 1) th layer, placing b1 pieces of layer insulation (02) at the height center of the coil wound upwards to the (n + 1) th layer, enabling b1 pieces of layer insulation (02) to pass through the position above the (n + 1) th layer to the position between the (n + 1) th layer and the (n + 2) th layer, placing c1 pieces of layer insulation (02), raising the layer to the (n + 2) th layer, and entering the step S2, wherein a1, b1 and c1 are positive integers;

when the nth layer coil (01) is an even number coil, winding the nth layer coil (01) upwards, placing c2 pieces of layer insulation (02), raising the layer to the (n + 1) th layer, placing b2 pieces of layer insulation (02) at the height center of the coil wound downwards to the (n + 1) th layer, enabling b2 pieces of layer insulation (02) to pass through the position above the (n + 1) th layer to the position between the (n + 1) th layer and the (n + 2) th layer, placing a2 pieces of layer insulation (02), raising the layer to the (n + 2) th layer and entering the step S2, wherein a2, b2 and c2 are positive integers;

step S2: and (3) N is equal to N +2, or after the N +2 th layer of coil (01) is wound, placing the oil channel (03) and raising the layer to the N +3 th layer, and repeating the step S1 until the winding of the N-th layer of coil (01) is completed, wherein N is the total number of layers of the coil.

7. The winding method of the cylindrical coil grading interlayer insulation structure according to claim 6, characterized in that a 1-a 2, b 1-b 2, and c 1-c 2.

8. The winding method of the cylindrical coil grading interlayer insulation structure according to claim 7, wherein a1 ═ c1 ═ 4, and b1 ═ 2.

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