KR102009746B1 - Manufacturing method of the winding coil for the transformer - Google Patents

Abstract

The present invention relates to a method of manufacturing a winding coil for a transformer with improved cooling efficiency, and more particularly, winding a second layer of coil in a winding mold, and inserting a cooling duct outside the winding layer of the secondary coil in the first layer. And winding the secondary coil of the next layer to form the secondary coil of the multiple circuit by winding the secondary coil of the next layer, inserting a cooling duct outside the secondary coil, and wrapping the interlayer thermal paper, and then Winding a coil, inserting a cooling duct outside the first coil winding layer of the first layer, wrapping the interlayer thermal paper, and winding the first coil of the next layer to form a plurality of primary coils of a plurality of circuits; A coil sizing step of pressing the sizing jig so that the outer shape of the winding coil wound up to the primary coil is maintained at a constant dimension, and the coil drying stage drying the coil sized winding coil to a constant temperature. Including, wire-wound coils which the first and second coil windings are formed in a cross-sectional structure of a rectangular, only two surfaces facing each other in the winding coil 4 myeonjung that the cooling duct is inserted.
According to the present invention as described above, by improving the layout design of the winding for the transformer without using a radiator used as a cooling means to maximize the heat transfer efficiency to reduce the outer diameter of the transformer to increase the aesthetics of the urban aesthetics, manufacturing process And it is effective to reduce the manufacturing cost.

Description

Manufacturing method of winding coil for transformer with improved cooling efficiency {Manufacturing method of the winding coil for the transformer}

The present invention relates to a method of manufacturing a winding coil for a transformer having a higher cooling efficiency, and more particularly, to improve the arrangement design of the winding of a transformer without using a radiator used as a cooling means to maximize the heat transfer efficiency of the column transformer. It relates to a method of manufacturing a winding coil for a transformer that can reduce the outer diameter.

In general, the power supplied from the power station to the high voltage (22.900V) is converted into a low voltage that can be used in the consumer, such as home or industrial sites through a transformer. In this case, a transformer is a general term for a device for changing an AC voltage and a current by an electromagnetic induction action. In particular, a transformer for converting a high voltage power transmitted from a power station into a low voltage required by a consumer is called a power distribution transformer. It is usually fixed to a telephone pole or a roadside.

The structure of a typical transformer may vary depending on its capacity and voltage, but commonly includes windings and iron cores for carrying out the functions of the transformer, and these windings and iron cores are mounted in a tank filled with insulating oil. F. This insulating oil prevents moisture or dust from penetrating into the insulation of the winding and lowers the dielectric strength, and at the same time, it dissipates heat generated from the iron core or the winding through convection and radiation of oil.

In this way, the losses generated during operation of the transformer are all thermal energy, which is dissipated from the surface of the winding and the core to increase the transformer temperature and degrade the insulation, thereby shortening the normal life expectancy of the transformer.

Therefore, by taking appropriate cooling method, temperature rise of insulation should be restrained and managed below the prescribed allowable value specified in the insulation. Therefore, heat distribution transformer is mainly transferred to enclosure and radiator by convection of oil to dissipate into the atmosphere. Inflow self-cooling method is adopted.

The conventional transformer has to be installed separately to the side of the main body of the radiator used as a cooling means to increase the manufacturing cost, the enclosure occupied by the area occupied by the radiator is thick, the visual stability is reduced due to the excessive size, city appearance And problems such as electric pole breaking due to bending moment applied to the pole.

Therefore, reducing the size of the conventional transformer reduces the manufacturing cost, improves the visual stability, and overcomes the unreasonable point of the ball pool using the frame steel that can solve problems such as electric pole loss due to the thickness of the enclosure, ball pool easy to store and carry The demand for is increasing.

Korean Registered Practice No. 338264

The present invention has been made to solve the above problems, the object of the present invention is to reduce the outer diameter of the transformer by maximizing the heat transfer efficiency by improving the layout design of the transformer winding without using a radiator used as a cooling means To provide a structure of a transformer that can be made.

According to an aspect of the present invention for achieving the above object, the winding of the first layer of secondary coil to the winding mold, insert the cooling duct outside the secondary coil winding layer of the first layer and wrap the interlayer insulating paper Winding a secondary coil of a next layer to form a secondary coil of a plurality of circuits; inserting a cooling duct outside the secondary coil, wrapping an interlayer heat transfer paper, and then winding the primary coil of the first layer; Inserting a cooling duct outside the first coil winding layer of one layer, wrapping the interlayer heating paper, and winding the primary coil of the next layer to form a plurality of layers of primary coils, and winding up to the primary coil A coil sizing step of pressing the sizing jig so that the outer shape of the winding coil is maintained at a constant size, and a coil drying step of drying the coil sized winding coil to a constant temperature; The wound winding coil is formed in a rectangular cross-sectional structure, and the cooling duct is inserted only on two faces of each of the four sides of the winding coil.

Here, the thickness of the cooling duct is 4.0mm or more and 6.0mm or less.

In addition, the primary and secondary coils are formed to have a larger surface area compared to the cross-sectional area.

Here, in order to maximize the thermal conductivity, the heat transfer area of the first and second coils is calculated using the following heat transfer equation (1).

Equation 1)

(here,

를 나타낸다)

Indicates)

Moreover, the secondary coil is made of aluminum sheet.

In addition, the primary coil is made of an aluminum ring wire.

In addition, the secondary coil has a thickness of 0.6.mm and a width of 400mm.

In addition, the primary coil has a diameter of 3.5mm.

Then, the pressboard is wrapped around the winding mold, and the secondary coil is wound around the winding mold.

In addition, the interlayer insulating paper is coated with a resin of a diamond pattern, the resin applied to the interlayer insulating paper is melted in the coil drying step to bond the first and second coils and the interlayer insulating paper.

In addition, in the coil sizing step, the two winding coils are brought into close contact with each other to press the sizing jig to both left and right sides thereof.

An interlayer insulating paper is inserted between the two winding coils.

In addition, the coil winding layer of each of the primary and secondary coils starts winding at the lower end of the coil and stops winding at the upper end while winding in the upward direction to form a winding layer, and the interlayer heat transfer paper is formed on the winding layer. After stacking, the coil of the winding layer is moved downward in a diagonal direction to form a diagonal connection part, and the winding is started again at the lower end and the winding is stopped in the upper direction while stopping the winding at the upper end to form a winding layer again. Repeatedly, the start of the coil winding is formed in one direction for each winding layer.

Here, the insulated tap tube is coupled to the diagonal connection portion formed for the single row winding of the coil winding layer.

According to the present invention as described above, by improving the layout design of the winding for the transformer without using a radiator used as a cooling means to maximize the heat transfer efficiency to reduce the outer diameter of the transformer to increase the aesthetics of the urban aesthetics, manufacturing process And it is effective to reduce the manufacturing cost.

1 is a flow chart showing the manufacturing procedure of the winding coil for a transformer according to the present invention.
2 is a view showing a cross-sectional structure of a winding coil for a transformer according to the present invention.
3 is a view briefly illustrating a coil sizing process according to the present invention.
4 is a conceptual diagram illustrating a winding method of a winding coil for a transformer according to the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

1 is a flow chart showing the manufacturing process of the winding coil for transformer according to the present invention, Figure 2 is a view showing the cross-sectional structure of the winding coil for transformer according to the present invention, Figure 3 is a simplified coil sizing process according to the present invention It is shown in the figure.

Referring to the drawings, the winding coil manufacturing method for a transformer according to the present invention is provided including a secondary coil 20 forming step, a primary coil 10 forming step, a coil sizing step and a coil drying step.

The secondary coil 20 forming step (S110) is installed to surround the press board 50, which is an insulating material, for insulation from the core (not shown) in a pre-prepared iron winding mold (not shown). Then, the winding coil is wound on the first layer of the secondary coil 20, and the cooling duct to smooth the convection of the insulating oil for the temperature emission of the winding of the first layer outside the winding layer of the secondary coil 20 of the first layer. Insert 30 and wrap the interlayer insulating paper 40, wind the secondary coil 20 in two layers, insert the cooling duct 30 and wrap the interlayer insulating paper 40 as in the first layer, and then The winding coil 20 is to be formed. In the present invention, three winding layers of the secondary coil 20 are formed, which may be variously changed according to the specification.

The secondary coil 20 is made of an aluminum sheet, the aluminum sheet is a magnetic flux is symmetrical to improve the short-circuit mechanical force and the number of turns is advantageous to the secondary coil 20.

In the primary coil 10 forming step (S120), the cooling duct 30 is inserted outside the secondary coil 20, the interlayer insulating paper 40 is wrapped, and then the primary coil 10 of the first layer is wound. Insert the cooling duct 30 outside the winding layer of the primary coil 10 of the layer, wrap the interlayer heat transfer paper, and then wound the primary coil 10 of the next layer to repeat a plurality of times. To form. Here, the primary coil 10 is preferably made of an aluminum ring line.

In the coil sizing step (S130), the winding coil wound up to the primary coil 10 may be pressed onto the sizing jig 100 so as to maintain a constant coil shape. In the coil sizing step S130 according to the present invention, as shown in FIG. 3, two winding coils are brought into close contact with each other and the assembly is completed to the enclosure in a state in which the sizing jig 100 is pressed to both left and right sides so that a separate stabilization process is required. Will not. In addition, the interlayer insulating paper 40 is inserted in advance on the contact surfaces of the left and right winding coils so that no empty space is generated, and the windings are not damaged, thereby improving the short-circuit mechanical strength and insulation strength.

Coil drying step (S140) is to dry the coil-sized winding coil to a constant temperature, generally maintained at 110 ℃ ~ 120 ℃ for 8-9 hours to remove the moisture of the coil, coated on the interlayer insulating paper 40 The resin of the diamond pattern is melted to bond the first and second coils 10 and 20 to the interlayer insulating paper 40.

In this manner, the winding coils around which the primary and secondary coils 10 and 20 are wound are formed in a rectangular cross-sectional structure, and the cooling duct 30 is inserted only on two surfaces facing each other among the four sides of the winding coil. .

In addition, the thickness of the cooling duct 30 is preferably made of a thickness of 4.0mm or more and 6.0mm or less, more specifically 5.6mm in consideration of viscosity and oil film phenomenon.

In addition, in order to remove the radiator and increase the cooling efficiency only by the natural convection phenomenon, to maximize the thermal conductivity of the primary and secondary coils (10, 20). Accordingly, the first and second coils 10 and 20 have a larger surface area compared to the cross-sectional area.

For example, the process of heat transfer of an object at 45 ℃ to 20 ℃ is performed by natural convection (heat transfer by air flow) and radiant heat, and heat transfer by natural convection is air flowing around 45 ℃ object. The higher the speed, the faster the heat transfer. The larger the surface area of a 45 ° C object, the faster the heat transfer.

In the equation, Q = hAT, where h is the convective heat transfer coefficient and A is the surface area of the object.

As such, in order to maximize thermal conductivity, heat transfer areas of the primary and secondary coils 10 and 20 may be calculated using Equation 1 below.

Equation 1)

(here,

를 나타낸다)

Indicates)

As such, looking at the specifications of the primary and secondary coils 10 and 20 to maximize the thermal conductivity, the secondary coil 20 is preferably made of 0.6.mm thick and 400mm wide, and the primary coil 10 is 3.5mmmm diameter will maximize the thermal conductivity.

4 is a conceptual diagram illustrating a winding method of a winding coil for a transformer according to the present invention. Referring to the drawings, a winding of a coil starts at a lower end and winds up in an upward direction, and stops a winding at an upper end, thereby winding the first winding layer. A first interlayer insulating paper 41 to be formed on the first winding layer W1, and then move the coil of the first winding layer downwardly to form a diagonal connection portion C1. The second winding layer W2 is formed by stopping the winding at the upper end while starting the winding at the lower end and winding the upper direction again.

Then, the second interlayer insulating paper 42 is laminated on the second winding layer W2, and then the coil of the second winding layer is moved downward in a diagonal direction to form a diagonal connection portion C1. Repeat this procedure to adjust the windings of the coils and the stack of interlayer insulating papers to meet the specifications.

Thus, the start of the winding is formed in one direction for each winding layer forming the coil winding layer.

In addition, the coil winding layer 60 is coupled to the insulating tap tube 70 for each diagonal connection (C1) for a single winding of the coil by stacking to exclude the influence of the potential difference between the winding layer and increase the insulation safety. To be configured.

Accordingly, each winding layer is wound in a row so that the start of the winding starts in one direction to form a coil winding layer 60 for the winding coil, so that the current flows in the same direction when voltage is applied by the same directionality between the respective winding layers. Since the potential difference between the winding layers is always the same, it is induced, and can be acted on the diagonal connecting portion (C1) by inserting and coupling the insulating tap tube 70 to the diagonal connecting portion (C1) connecting the winding layers. It will function to counteract the reaction influence of the magnetic field between each winding layer.

Although the present invention has been described in connection with the above-mentioned preferred embodiments, it is possible to make various modifications or variations without departing from the spirit and scope of the invention. Therefore, the scope of the appended claims will include such modifications and variations that fall within the spirit of the invention.

10: primary coil 20: secondary coil
30: cooling duct 40: interlayer insulating paper
50: press board 60: coil winding layer
70: insulated tap tube
100: Sizing Jig

Claims (14)

Winding the first layer of secondary coil on the winding mold, inserting the cooling duct outside the secondary coil winding layer of the first layer, wrapping the interlayer insulating paper, and winding the secondary coil of the next layer Forming a coil;
Insert a cooling duct outside the secondary coil of the plurality of layers and wrap the interlayer heat transfer paper, and then wind the primary coil of the first layer, insert the cooling duct outside the primary coil winding layer of the first layer, and wrap the interlayer heat transfer paper. Winding a primary coil of a next layer to form a primary coil of a plurality of layers;
A coil sizing step of compressing the sizing jig so that an outer shape of the winding coil wound up to the first coil of the plurality of layers is maintained at a predetermined dimension;
A coil drying step of drying the coil sized winding coil to a constant temperature; including,
The winding coil wound around the plurality of layers of primary and secondary coils is formed in a rectangular cross-sectional structure, and the cooling duct is inserted only on two surfaces facing each other among four surfaces of the winding coil.
The first and second layers of the plurality of layers are characterized in that the surface area is formed larger than the cross-sectional area,
In order to maximize the thermal conductivity using the following heat transfer equation 1, the method of manufacturing a coil winding for transformers with increased cooling efficiency, characterized in that to calculate the heat transfer area of the first and second coils of the plurality of layers.
Equation 1)

(here,

Indicates)
The method of claim 1,
The thickness of the cooling duct is 4.0mm or more 6.0mm or less manufacturing method of the winding coil for a transformer with increased cooling efficiency.
delete delete The method of claim 1,
The secondary coil of the plurality of layers is a manufacturing method of the winding coil for a transformer with increased cooling efficiency, characterized in that the aluminum sheet.
The method of claim 5,
The primary coil of the plurality of layers is a manufacturing method of the winding coil for a transformer with increased cooling efficiency, characterized in that the aluminum ring.
The method of claim 5,
The secondary coil of the plurality of layers is 0.6.mm in thickness, 400mm in width width of the coil winding for transformer with increased cooling efficiency, characterized in that consisting of.
The method of claim 6,
The primary coil of the plurality of layers is a manufacturing method of the winding coil for a transformer with increased cooling efficiency, characterized in that the diameter of 3.5mmm.
The method of claim 1,
After wrapping the press board in the winding mold, the winding coil for transformer with increased cooling efficiency, characterized in that winding the plurality of secondary coils in the winding mold.
The method of claim 1,
The interlayer insulating paper is coated with a resin of a diamond pattern, and the resin applied to the interlayer insulating paper is melted in the coil drying step to increase the cooling efficiency of the first and second layers of coils and the interlayer insulating paper. Method for manufacturing winding coil for transformer.
The method of claim 1,
In the coil sizing step, the two winding coils are in close contact with each other to press the sizing jig to the left and right sides, the manufacturing method of the coil winding coil for increased cooling efficiency.
The method of claim 11,
A method of manufacturing a winding coil for a transformer having a high cooling efficiency, characterized in that an interlayer insulating paper is inserted between the two winding coils.
The method of claim 1,
The coil winding layer of each of the first and second coils of the plurality of layers may be wound by winding the coil at the upper end and stopping the winding at the upper end, thereby forming a winding layer. After laminating on the above, the coil of the winding layer is moved downward in a diagonal direction to form a diagonal connection part, and the winding layer is formed again by stopping the winding at the upper end while starting the winding at the lower end and winding in the upper direction. Repeatedly so that the start of the coil winding for each winding layer is formed in one direction.
The method of claim 13,
Diagonal connection portion formed for the series winding of the coil winding layer is a method of manufacturing a winding coil for a transformer with increased cooling efficiency, characterized in that the insulating tab tube is coupled.

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