KR101094774B1 - Electrical supply molded transfomer - Google Patents

Abstract

The present invention relates to a mold transformer for power distribution, comprising: a section winding formed by winding a conductor with a set number of turns; And a high pressure winding formed by axially stacking a plurality of unit high pressure windings including a partial duct inserted into the section winding. Thereby, winding operation can be made easy and the temperature rise of a winding conductor can be suppressed.

Description

Mold transformer for power distribution {ELECTRICAL SUPPLY MOLDED TRANSFOMER}

The present invention relates to a mold transformer for distribution, and more particularly, to a mold transformer for distribution that can suppress the temperature rise.

As is well known, a transformer is a device that changes the value of alternating voltage or current by using electromagnetic induction.

Such a transformer includes an iron core (core) forming a magnetic path, a primary winding wound around the iron core with a predetermined number of turns, and a secondary winding wound with the primary winding and a predetermined winding ratio. It can be configured with a winding.

Some of the above-described transformers are used by being composed of an enclosure and a so-called inflow (oil) transformer in which a transformer main body is arranged inside the enclosure, and oil (insulating oil) is injected for insulation and cooling of the windings. These inrush transformers can cause a fire in the event of an oil spill, overload or short circuit.

In view of these problems, recently, so-called mold transformers are used in which the primary winding and the secondary winding are wrapped (molded) with a resin (epoxy resin) having excellent insulation.

On the other hand, the life of the transformer is closely related to the temperature rise of the winding (conductor) .When the service life exceeds the total temperature of 20 ℃ by exceeding the limit of temperature rise of the transformer (over 20 ℃), the life of the transformer is approximately 25%. It is known to decrease.

However, in such a conventional mold transformer, a natural convection method is used to cool the windings, and a structure of a transformer capable of quickly and easily winding work and suppressing a temperature rise of the winding conductor is urgently required. It is becoming.

Therefore, an object of the present invention is to provide a mold transformer for power distribution that can suppress the temperature rise of the winding conductor.

In addition, another object of the present invention is to provide a mold transformer for distribution that can facilitate the winding operation and can suppress the temperature rise of the winding conductor.

The present invention, the section winding is formed by winding the conductor in a set number of turns to achieve the above object; And a partial duct inserted into the section winding; and a high voltage winding formed by axially stacking a plurality of unit high voltage windings.

Here, the partial duct may be configured with a body in which a flow path is formed therein and a connection part connecting different bodies to communicate with each other.

The duct formed by the partial duct may be composed of a plurality.

The duct may be spaced apart along the circumferential direction of the section winding.

The duct may be spaced apart along the radial direction of the section winding.

The ducts may be spaced apart along the circumferential direction of the section winding and spaced along the radial direction.

The high voltage winding may be formed of a plate conductor.

The high voltage winding may further include a molding unit formed around the stacked unit high pressure winding unit.

It may be configured to further include a low pressure winding disposed concentrically with the high pressure winding.

The low pressure winding may be configured to be disposed inside the high pressure winding.

The low pressure winding may be formed by winding a plate-shaped conductor having a longer width than the thickness.

The conductor may be wound apart along the radial direction.

It may be configured to further include an iron core disposed in the center of the high pressure winding and the low pressure winding.

The low pressure winding may be configured to be disposed between the high pressure winding and the iron core.

As described above, according to one embodiment of the present invention, it is possible to suppress the temperature rise of the winding conductor by forming a duct between the conductors of the winding.

In addition, the high-voltage winding is provided with a plurality of section windings, the partial duct is inserted and connected when the winding of each section winding is connected to suppress the occurrence of interference between the conductor and the duct during the winding of the conductor, so that the winding operation can be quickly and easily can do.

In addition, by using a plate-shaped conductor (foil) as the conductor of the high-voltage winding, the number of turns (the number of turns) of the conductor can be significantly reduced during the winding operation.

In addition, by using a plate-shaped conductor as the conductor of the high-voltage winding, and the high-voltage winding is provided with a plurality of section windings, a partial duct is inserted into each section winding, so that the number of turns of the conductor can be reduced during winding work, plate conductors and parts The interference of the duct does not occur, so that the continuous winding of the plate-like conductors is possible, thereby making the winding operation more rapid and easier and suppressing the temperature rise of the conductors.

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

1 is a perspective view of a mold transformer for power distribution according to an embodiment of the present invention, FIG. 2 is a schematic configuration diagram of the iron core of FIG. 1, FIG. 3 is a partial longitudinal cross-sectional view of FIG. 1, and FIG. 4 is of FIG. 1. It is a perspective view of a high voltage winding. As shown in FIGS. 1 to 4, the mold transformer for power distribution includes an iron core 120, a low pressure winding 130 disposed around the iron core 120, and a low pressure winding 130. It is configured to include a high-voltage winding 140 is disposed, the high-voltage winding 140, the section winding 143 formed by winding the conductor 144 to a set number of turns, and the portion inserted into the section winding 143 The unit high pressure windings 141 having the ducts 145a may be stacked in the axial direction. Here, the low voltage winding 130 and the high voltage winding 140 may be formed to correspond to the number of phases of the power source, respectively. Hereinafter, the low-voltage winding 130 and the high-voltage winding 140 will be described by taking an example of the three configured to correspond to the three-phase power source.

The iron core (core) 120 may be formed of a plurality of electrical steel sheet to form a magnetic path. The electrical steel sheets may have a thin thickness and be laminated insulated. The iron core 120 may include three vertical sections 121 spaced apart from each other and disposed in a vertical direction, and two horizontal sections 125 connecting the vertical sections 121 to each other to form a closed circuit. Can be. As shown in FIG. 2, the iron core 120 may include a first iron core portion 120a and a second iron core portion 120b that are assembled to each other in the vertical direction. The first iron core portion 120a may include an upper horizontal section 125a and three partial vertical sections 121a extending downward from the upper horizontal section 125a. The second iron core portion 120b may be configured to include three partial vertical sections 121b extending upwardly from the lower horizontal section 125b and the lower horizontal section 125b. The first iron core portion 120a and the second iron core portion 120b may be configured to be fitted with a predetermined fastening up and down with each other.

Frames (not shown) may be provided at upper and lower sides of the iron core 120 to support the iron core 120. The frame may be formed with winding support parts for supporting the low-voltage winding 130 and the high-voltage winding 140 to be maintained concentrically with each other.

The low pressure winding 130 may be configured to include a plate-like conductor 133. The plate-shaped conductor 133 may be formed to have a height corresponding to the entire height of the high-voltage winding 140. The plate-shaped conductor 133 of the low pressure winding 130 may be wound in a spiral around the iron core 120. The plate-shaped conductors 133 may be wound to be spaced apart from each other along the radial direction without being in contact with each other. Thereby, cooling of the said plate-shaped conductor 133 becomes easy and it can suppress a temperature rise. An outer portion of the plate-shaped conductor 133 may further include a molding part 135 formed by molding with a synthetic resin (for example, an epoxy resin).

On the other hand, the high pressure winding 140 may be provided on the outside of the low pressure winding 130 to be spaced apart in the radial direction. The high pressure winding 140 may have a cylindrical shape and may be disposed concentrically with the low pressure winding 130.

The high voltage winding 140 may include a conductor 144 and a duct 145 forming an air flow path between the conductors 144. As a result, heat generated in the conductor 144 can be easily released, thereby suppressing an increase in temperature of the conductor 144. Accordingly, the life of the high-voltage winding 140 may be extended. The duct 145 may be formed of a plurality of spaced apart along the circumferential direction of the high-voltage winding (140). As a result, heat of the high-voltage winding 140 can be effectively released.

The high voltage winding 140 may further include a molding unit 160 formed by molding a synthetic resin (for example, an epoxy resin) around the conductor 144. One side of the high-voltage winding 140, more specifically, one side of the molding portion 160 of the high-voltage winding 140 may be provided with a terminal portion 163 protruding outward with a predetermined width. Here, the upper and lower ends of the duct 145 may be formed to communicate with the outside of the molding unit 160 to allow the air to enter and exit. As a result, heat generated in the conductor 144 may be easily released. Each of the ducts 145 may include a plurality of partial ducts 145a coupled in communication with each other along an axial direction.

The high-voltage winding 140 is a section winding 143 or a section coil (hereinafter referred to as a section winding 143) formed by winding the conductor 144 a predetermined number of turns, and a section. It may be configured to include a plurality of unit high-pressure winding portion 141, each having an partial duct (145a) inserted into the winding 143 is disposed in the axial direction. Here, the conductor 144 of the high-voltage winding 140 is a plate-like conductor 144 or foil 144 having a thin thickness, a predetermined width (for example, a thickness of 2 mm, a width of 64 mm) and a long length. It can be formed as.

Hereinafter, a manufacturing process of the high voltage winding will be described with reference to FIGS. 5 to 9.

5 is a partial perspective view showing a state in which the conductor and the duct of the high-voltage winding of Figure 3 is coupled, Figure 6 is a partial cross-sectional view of the high-voltage winding of Figure 3, Figure 7 is a connection process of the conductor and the partial duct of Figure 6 8 is a diagram illustrating a state of engagement of the partial duct of FIG. 6, FIG. 9 is an exploded perspective view of the partial duct of FIG. 8, and FIG. 10 is a mold transformer for power distribution according to another embodiment of the present invention. Is a plan view of the high-voltage winding. 6 and 7, the high voltage winding 140 includes a plurality of unit high pressure windings 141 spaced apart in the axial direction. In the present exemplary embodiment, the unit high voltage winding unit 141 includes a first unit high pressure winding unit 141a to an eleventh unit high pressure winding unit 141k. The number of unit high voltage windings 141 may be appropriately adjusted. Each of the unit high-voltage windings 141 may include a conductor that is wound in a radial direction with a predetermined width and a plurality of partial ducts 145a that are inserted into the conductor and connected to each other in an axial direction. Can be.

The partial duct 145a may be configured in plural to be spaced apart along the circumferential direction of the section winding 143. The plurality of partial ducts 145a may be disposed on substantially the same circumference.

The section winding 143 may include an inner winding portion 143a disposed inside the partial duct 145a and an outer winding portion 143b disposed outside the partial duct 145a.

Meanwhile, as shown in FIG. 10, the partial duct 145a may be formed in plural and spaced apart along the radial direction of the section winding 143. Here, the partial duct 145a may be spaced apart from each other along the radial direction and spaced apart in the circumferential direction. More specifically, the inner duct 151 is formed by arranging the partial ducts 145a at equal angles θ on the circumference having the first radius r1, and forming the inner duct part 151 on the circumference having the second radius r2. The partial ducts 145a may be disposed at equal angles θ, and the outer ducts 152 may be formed alternately with the inner ducts 151.

The partial duct 145a may be formed to have a larger upper and lower width (height) H2 than the upper and lower width (height) H1 of the conductor so as to protrude to both sides of the conductor. As a result, the connection work of the partial duct 145a can be facilitated.

As illustrated in FIG. 8, the partial duct 145a may include a body 147 having an air flow path therein and a connection part 148 connecting the body 147 to communicate with each other. . The connection portion 148 is a protrusion 149 protruding from one end of the body 147 and the insertion portion 149 of the other body 147 to be inserted into the other end of the body 147 is inserted It may be configured with a portion 150. The protrusion 149 may be formed to have a reduced left and right width compared to the left and right widths of the body 147.

By such a configuration, when the high voltage winding 140 is to be formed, one end of the conductor is first disposed on an imaginary circumference, and the inner winding portion 143a is wound by winding a predetermined number of times so that the conductor is radially stacked. Form. Next, the partial duct 145a is disposed on the outer surface of the inner winding portion 143a in the circumferential direction, and the outer winding portion 143b is formed by winding a conductor a predetermined number of times on the outer surface of the partial duct 145a. In this way, the first unit high voltage winding portion 141a is formed.

The conductor is then extended in the axial direction and wound at a predetermined number of turns on an imaginary circumference having the same diameter as the inner winding portion 143a of the section winding 143 of the first unit high voltage winding portion 141a. Next, the partial duct 145a is disposed on the outer surface of the inner winding portion 143a of the section winding 143 of the second unit high voltage winding portion 141b. In this case, as shown in FIG. 6, the protrusion 149 of the partial duct 145a of the first unit high pressure winding 141a is inserted into the insertion portion 148 of each partial duct 145a. When the conductor is wound around the outer surface of the next partial duct 145a a predetermined number of times, a second unit high voltage winding portion 141b is formed on one side of the first unit high pressure winding portion 141a along the axial direction. By repeating the above-described process, the third unit high pressure winding unit 141c to the eleventh unit high pressure winding unit 141k are further formed. Finally, when the eleventh unit high pressure winding part 141k is formed, the mold is disposed outside thereof, and the molten synthetic resin (epoxy resin) is injected to form the molding part 160.

Meanwhile, when the low pressure winding 130 and the high pressure winding 140 are formed, the high pressure winding 140 is disposed concentrically on the outside of the low pressure winding 130. Next, the iron core 120 is disposed in the low pressure winding 130. In this case, the iron core 120 may be inserted into each of the upper and lower sides of the low pressure winding 130, and may be integrally coupled.

Next, the low pressure winding 130 and the high pressure winding 140 are coupled to the frame so that the low pressure winding 130 and the high pressure winding 140 may be maintained concentrically with each other.

In the above, specific embodiments of the present invention have been shown and described. However, the present invention can be embodied in various forms without departing from the spirit or essential features thereof, so the embodiments described above should not be limited by the details of the detailed description.

Further, even when the embodiments not listed in the detailed description have been described, it should be interpreted broadly within the scope of the technical idea defined in the appended claims. It is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

1 is a perspective view of a mold transformer for power distribution according to an embodiment of the present invention;

FIG. 2 is a schematic configuration diagram of the iron core of FIG. 1;

3 is a partial longitudinal cross-sectional view of FIG.

4 is a perspective view of the high-voltage winding of Figure 1,

5 is a partial perspective view showing a state in which the conductor and the duct of the high-voltage winding of FIG. 3 are coupled;

6 is a partial cross-sectional view of the high-voltage winding of Figure 3,

7 is a view showing a connection process of the conductor and the partial duct of FIG.

8 is a view showing a state of engagement of the partial duct of FIG.

9 is an exploded perspective view of the partial duct of FIG. 8, FIG.

10 is a plan view of a high-voltage winding of a mold transformer for power distribution according to another embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

120: iron core 120a: first iron core

120b: second iron core 121: vertical section

125: horizontal section 130: low-voltage winding

140: high voltage winding 141a to 141k: first to eleventh unit high voltage winding

143: section winding 143a: internal winding

143b: outer winding 144: conductor

145 duct 145a partial duct

147: body 148: connection

149: protrusion 150: insertion portion

Claims (14)

A section winding formed by winding the conductor with a set number of turns; And And a high pressure winding formed by axially stacking a plurality of unit high pressure windings including a partial duct inserted into the section winding. The partial duct includes a body having a flow path formed therein and a connection part connecting different bodies to communicate with each other. delete The method of claim 1, And a plurality of ducts formed by the partial ducts. The method of claim 3, The duct is a mold transformer for power distribution, characterized in that spaced apart along the circumferential direction of the section winding. The method of claim 3, The duct is a mold transformer for power distribution, characterized in that spaced apart along the radial direction of the section winding. The method of claim 3, And the ducts are spaced apart along the circumferential direction of the section winding and spaced along the radial direction. The method of claim 1, The high voltage winding is a mold transformer for power distribution, characterized in that formed by a plate-shaped conductor. The method of claim 7, wherein The high voltage winding further includes a molding unit formed around the stacked unit high voltage winding unit. The method according to any one of claims 1 or 3 to 8, A mold transformer for distribution further comprising a low pressure winding disposed concentrically with the high voltage winding. 10. The method of claim 9, The low voltage winding is a mold transformer for power distribution, characterized in that disposed inside the high voltage winding. 10. The method of claim 9, The low voltage winding is a molded transformer for power distribution, characterized in that formed by winding a plate-shaped conductor having a long width compared to the thickness. The method of claim 11, And the conductors are wound in a radially spaced apart manner. 10. The method of claim 9, The mold transformer for distribution further comprising an iron core disposed in the center of the high-voltage winding and the low-voltage winding. The method of claim 13, And the low voltage winding is disposed between the high voltage winding and the iron core.

Images