KR101593894B1 - Bushing of transformer and manufacturing method of terminal for bushing of transformer - Google Patents

Abstract

The present invention relates to a transformer with a built-in transformer, which comprises an inner insulator 21 which is hermetically held on the inside and outside of a transformer enclosure 10 and a terminal 30 which is connected to a center conductor 40 inserted into the outer insulator 22, (30), characterized in that a conductive plate (100) composed of a small-thickness upper conductor (31), a medium-thick middle conductor (32) and a large-thickness lower conductor (33) A step S20 of cutting the conductor plate 100 to an equal width, a step of forming a connection hole 31a in the upper conductor 31 so that the external conductor is connected, A step S30 of completing the terminal 30 by providing a coupling protrusion 33a having a coupling groove 33b for receiving the center conductor 40 at the lower portion of the lower conductor 33 by lathe machining To a method of manufacturing a terminal for a transformer bushing.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a transformer bushing and a transformer bushing,

The present invention relates to a transformer bushing and a method for manufacturing a terminal for a transformer bushing. More particularly, the present invention relates to a transformer bushing and a method of manufacturing a terminal for a transformer bushing, which can maximize heat dissipation while greatly improving productivity.

Generally, a transformer is a transformer for transforming a high voltage to a low voltage for transmission and distribution. The transformer is composed of a plurality of winding coils having mutual induction and an iron core wound with the winding coils to form a magnetic path, Is connected. With this configuration, while the transformed voltage is supplied and distributed, heat is generated in the winding coil, the iron core, and the bushing by voltage, and various methods are performed to cool the transformer. One of the cooling methods is to charge the insulating oil in the transformer And circulates the insulating oil to cool the winding coils and the iron core.

FIG. 1A is a perspective view showing a bushing for a transformer according to the prior art (Korean Patent No. 0818958), and FIG. 1B is a sectional view showing a bushing for a transformer according to the prior art document.

According to the prior art document, an outer insulator 32 and an inner insulator 33, which are hermetically coupled to the inside and outside of the through hole 31 formed in the enclosure 30 of the transformer, And a center conductor 34 passing through the transformer 33 to apply a voltage in the transformer to the outside.

The center conductor 34 is integrally formed at the end of the rod 35 and extends to the outside from the inside of the enclosure 30 and is connected to the outer conductor 30 A long hole 38 is formed along the longitudinal direction so that the insulating oil flows into the rod 35 and a long hole 38 is formed between the rod 35 and the inner insulator 32 and the outer insulator 33 And an inflow space 41 through which the insulating oil flows is formed in communication with the long hole 38.

A groove 39 is formed in the bottom surface of the outer insulator 32 and a protrusion 40 inserted in the groove 39 is formed on the top surface of the inner insulator 33.

The bushing 100 is provided with the outer insulator 32 and the inner insulator 33 and the terminal 36 of the center conductor 34 penetrating into the insulator 32 and the insulator 33 And the lower end of the rod 35 is exposed to the outside so as to be connected to the outer conductor and the winding terminal inside the transformer, respectively.

The terminal 36 is provided with a clamp 37 for coupling the outer conductor and the packing 42a and 42b are disposed between the inner insulator 32 and the outer insulator 33 to provide airtightness But also the center conductor 34 is joined to the upper and lower ends of the outer insulator 32 and the inner insulator 33 while maintaining airtightness.

The outer insulator 32 and the inner insulator 33 coupled to the inside and outside of the through hole 31 formed in the enclosure 30 of the transformer are interposed with the packing 42 so as to maintain the airtightness, And a center conductor 34 passing through the central portion of the inner insulator 33 for applying a voltage in the transformer to the outside. The center conductor 34 is composed of a rod 35 extending outwardly from the inside of the transformer and a terminal 36 formed at the end of the rod 35. The central conductor 34 is provided with a long hole 38 Is formed. The center conductor 34 is made of copper or copper alloy such as copper, bronze, brass or silicon bronze and is formed by a method such as die casting, hot forging, iron casting or the like so that the rod 35 and the terminal 36 are integrally formed. .

A communicating hole 45 is formed at one side of the long hole 38 so as to communicate with the outside of the rod 35. The center insulator 32 and the insulator 33 are formed such that the center conductor 34 passes A through hole 46 is formed as much as possible. In addition, when the center conductor is coupled to the through-hole 46 of the outer and inner insulators, the through-hole 46 is formed to be larger than the outer diameter of the rod 35 so that a gap is created when the rod 35 is engaged. Is formed by the long hole 38 formed in the rod 35 and the communication hole 45 to form an insulating oil inflow space 41 having a shape similar to that of the long hole 38 from the outside of the rod 35.

The insulating oil filled in the transformer is supplied to the rod 35 through the elongate hole 38 and the communicating hole 45. The rod 35 is connected to the shaft hole 38 and the communication hole 45, Oil inflow space 41 formed on the outside of the casing. Heat generated in the rod 35 by the introduced insulating oil is conducted to the outside through the outer insulator 32 and the inner insulator 33, thereby cooling the rod 35.

An insulating oil circulating hole may be formed in the packing 42d disposed at the lower end of the inner insulator 33 so that the insulating oil flowing into and out of the rod 35 is circulated to the transformer side.

1B shows the packing 42c for maintaining the airtightness at the upper end of the outer insulator 32. The packing 42c of the upper insulator 32 is formed by the enlarged diameter portion 47 at the upper end of the outer insulator 32, The inner insulator 32 and the outer insulator 33 and the center conductor 35 are hermetically coupled to the enclosure 30 of the transformer by the nut member 48 at the lower end, And a nut member 49 for coupling the winding terminal inside the transformer is screwed to the rod 35.

However, the bushings for transformers according to the prior art documents have a disadvantage in that not only the manufacturing speed is significantly lowered but also the productivity is significantly lowered because the terminal 36 is manufactured by a method such as sand casting, hot forging, iron casting or the like.

Also, although the bushings for transformers according to the prior art document propose the elongated holes 38 and the communicating holes 45 for cooling the rod 35, there is a great limitation in solving the high temperature of the rod 35.

Prior Art Documents; Korean Patent No. 0818958 (Bushing for Transformer)

It is an object of the present invention to provide a transformer bushing and a method of manufacturing a terminal for a transformer bushing that can maximize heat dissipation of the center conductor.

It is an object of the present invention to provide a semiconductor device and a method of manufacturing the same, in which, when there is a sudden change in size between a small-thickness upper conductor and a large-thickness lower conductor, And a method of manufacturing a terminal for a transformer bushing that can maximize heat dissipation by enabling air cooling by bumping outside air by providing a line.

It is an object of the present invention to provide a method of manufacturing a terminal for a transformer bushing capable of realizing an extrusion process for quickly forming a terminal by forming a heat radiating protrusion line in a lateral direction of a middle conductor.

In the present invention, a conductor plate (for example, a conductor plate made of copper, ebonite or aluminum) made of a small-thickness upper conductor, a medium-thick middle conductor and a large-thickness lower conductor is continuously produced by extrusion, A method of manufacturing a terminal for a transformer bushing capable of realizing a continuous and rapid process by maximizing the productivity can be achieved by cutting the plate into equal widths and then successively forming a connection hole and an engagement groove by machining the terminal. .

According to an aspect of the present invention,

A method of manufacturing a terminal for a transformer bushing for manufacturing a terminal connected to an outer conductor while being coupled to an inner insulator and a center conductor inserted in an outer insulator, the insulator being hermetically sealed inside and outside a transformer housing incorporating insulating oil,

A step of extruding a conductor plate made of a small-thickness upper conductor, a medium-thick middle conductor and a large-thickness lower conductor,

A step of cutting the conductor plate at equal widths,

A step of drilling a connection hole in the upper conductor so that the external conductor is connected and a coupling protrusion having a coupling groove for receiving the center conductor in a lower portion of the lower conductor by lathe machining to complete the terminal As a basic feature of the technical method.

According to an aspect of the present invention,

A transformer bushing including an inner insulator coupled to the inside and outside of a transformer housing incorporating insulating oil to be hermetically sealed and a terminal connected to an outer conductor while being coupled to a center conductor inserted into the outer insulator,

The terminal has a large-thickness lower conductor having an upper conductor of a small thickness through which a connection hole is bored so that the external conductor is connected, and a coupling protrusion having a coupling groove for receiving the center conductor, Lt; RTI ID = 0.0 > medium conductor < / RTI >

And the middle conductor further has a radiating and projecting line on its surface as a basic feature of its technical construction.

The present invention has the effect of maximizing the heat dissipation of the center conductor.

In the present invention, when there is a sudden change in size between a small-thickness upper conductor and a large-thickness lower conductor, the heat can be further increased. So that it is possible to cool air-cooled by impact of outside air, thereby maximizing heat dissipation.

The present invention has the effect of enabling an extrusion process for quickly forming a terminal by forming a heat radiation projection line in the transverse direction of the middle conductor.

The present invention has the effect that the heat of the center conductor can be greatly lowered by the contact between the radiating fin and the insulating oil.

In the present invention, a conductor plate (for example, a conductor plate made of copper, ebonite or aluminum) made of a small-thickness upper conductor, a medium-thick middle conductor and a large-thickness lower conductor is continuously produced by extrusion, It is possible to achieve a continuous and rapid process by cutting the plate into equal widths and then successively forming the connection holes and the engaging grooves or the like by lathe machining to complete the terminal, thereby achieving the maximization of productivity.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1A is a perspective view showing a bushing for a transformer according to the prior art document. Fig.
1B is a cross-sectional view showing a bushing for a transformer according to the prior art document.
2 is a cross-sectional view of the entire main part showing a transformer bushing according to the present invention;
3 is an exploded perspective view showing a terminal and a center conductor applied to the transformer bushing according to the present invention.
4A to 4D are process drawings showing a method of manufacturing a terminal for a transformer bushing according to the present invention.

A preferred embodiment of a method of manufacturing a transformer bushing and a terminal for a transformer bushing according to the present invention will be described with reference to the drawings. There may be a plurality of embodiments thereof, and the objects, features, You will gain a better understanding of these benefits.

Fig. 2 is a cross-sectional view of the entire main part showing the transformer bushing according to the present invention. Fig.

2, the transformer bushing according to the present invention includes an inner insulator 21 and a center conductor 21 inserted into the outer insulator 22 so as to be hermetically sealed inside and outside the transformer enclosure 10, 40 and connected to external leads.

The terminal 30 is connected to an unillustrated outer conductor and the central conductor 40 is connected to a coil not shown in the transformer enclosure 10 and the unillustrated reference numeral P1 denotes an inner insulator (Not shown) is a packing for maintaining the airtightness between the outer insulator 21 and the outer insulator 22, and the reference numeral P2 is a packing interposed between the outer shell and the terminal 30, .

3 is an exploded perspective view showing the terminal 30 and the center conductor 40 applied to the transformer bushing according to the present invention.

2 and 3, the terminal 30 according to an aspect of the present invention includes an upper conductor 31 having a small thickness in which a connection hole 31a is opened to connect an external conductor, A lower conductor 33 having a large thickness and an engaging projection 33a having an engaging groove 33b for receiving the upper conductor 31 and the lower conductor 33, The middle conductor 32 includes a middle conductor 32 having a middle thickness, and in particular, the middle conductor 32 further includes a heat radiating protrusion line 32a on the surface thereof.

In the present invention, the large (middle) and the small (small), which indicate the size of the thickness, are not intended to show a specific size, but are relatively small in relation to each other between the lower conductor 33, the middle conductor 32 and the upper conductor 31 It can be said that the difference is due to the size of the thickness, and the specific size thereof does not have much significance because it may vary depending on the capacity of the transformer.

The transformer is for transforming a high voltage to a low voltage for transmission and distribution. The transformer is composed of a plurality of winding coils for mutually inducting in the transformer housing 10 and an iron core for winding the winding coils to form a magnetic path, The central conductor 40 and the terminal 30 are connected to the outside for drawing out.

However, during the transmission and distribution of the voltage transformed by the above-described configuration, heat is generated in the winding coil, the iron core, the central conductor 40 and the terminal 30 by the voltage.

In particular, in order to prevent such a phenomenon, in the present invention, the lower conductor (33) of the terminal (30), which is a part that meets the center conductor (40) And the upper conductor 31 to which the outer conductor is connected has a medium thickness instead of being made small in order to assemble the medium conductor 32 serving as an intermediary therebetween.

At this time, if there is a sudden change in size between the small-thickness upper conductor 31 and the large-thickness lower conductor 33, the high temperature may be further increased. It is also possible to provide a heat radiating protrusion line 32a on the surface of the heat radiating protrusion line 32a so as to allow air cooling by the impact of outside air to maximize heat dissipation.

The heat radiating protrusion line 32a, which is a key feature of the present invention, can be formed in the lateral direction of the middle conductor 32. The special reason is that in order to quickly manufacture the terminal 30 of the method of the present invention, .

According to the feature of the present invention, the elongated hole 41 in which the insulating oil enters in the longitudinal direction of the center conductor 40 is pierced and fixed in the elongated hole 41, and at the same time, the heat of the center conductor 40 is dissipated And a heat dissipation fin 50 which dissipates heat.

The radiating fins 50 are made of aluminum, copper, or brass having excellent thermal conductivity, so that the heat of the center conductor 40 can be lowered while being in contact with the insulating oil more quickly.

The radiating fin 50 may include a radiating pipe 51 which is press-fitted into the long hole 41 and a radiating vane 51a protruding in the longitudinal direction on the inner circumference of the radiating pipe 51.

The heat radiating vane 51a is protruded in the longitudinal direction on the inner peripheral edge of the heat radiating pipe 51 so that the contact surface area with the insulating oil can be widened to maximize the heat radiating effect.

The center conductor 40 may further include a side hole 42 communicating with the elongated hole 41 so that the insulating oil flows into the elongated hole 41 while being in contact with the radiating fin 50 to radiate heat, 42 so as to maximize the effect of heat dissipation by the radiating fins 50.

4A to 4D are process drawings showing a method of manufacturing a terminal for a transformer bushing according to the present invention.

A method of manufacturing a terminal for a transformer bushing according to the present invention includes the steps of inserting an insulator 21 inside and outside of a transformer housing 10 incorporating insulating oil so as to maintain airtightness and a center conductor 40 inserted into the insulator 22 As shown in Fig. 4A, a method of manufacturing a terminal 30 that is coupled to an external conductor, comprising the steps of: forming an upper conductor 31 of a small thickness, a middle conductor 32 of medium thickness, and a bottom conductor 33 of a large thickness, 4B and 4C, the conductor plate 100 is cut into equal widths (S20). Then, as shown in FIG. 4D, the outer conductor And a coupling protrusion 33a having a coupling groove 33b for receiving and receiving the center conductor 40 at the lower portion of the lower conductor 33 is formed in the upper conductor 31 so as to be connected to the upper conductor 31, So that the terminal 30 can be completed (S30).

Generally, the method of manufacturing the transformer bushing terminal 30 is a process of putting a molten material made of copper or brass into a mold and solidifying the molten material. In such a case, the rapidity is remarkably decreased and the productivity is also significantly lowered.

In view of such a problem, in the present invention, a conductor plate 100 made of a small-thickness upper conductor 31, a medium-thick conductor 32 and a large-thickness lower conductor 33 (for example, The conductive plate 100 is cut to have an equal width and then the connecting hole 31a and the engaging groove 33b are formed by lathe machining So that the terminal 30 can be completed, so that a continuous and rapid process can be performed, thereby maximizing the productivity.

At this time, in the step S10, when the conductor plate 100 is extruded, the radiating protrusion line 32a is formed in the longitudinal direction on the surface of the middle conductor 32 so as to realize the extrusion process, .

Further, in step S30, a fitting groove 33c for receiving the upper end of the outer insulator 22 is further provided between the rims of the coupling protrusions 33a and the lower conductor 33 to form a coupling force with the outer insulator 22 And further improve the assemblability.

Meanwhile, in step S30, the outer conductor of the lower conductor 33 is lathe-processed to have a circular shape like the outer periphery of the outer insulator 22 so as to ensure the appearance of stability.

The present invention can be used in the transformer industry related to transmission and distribution.

10: Transformer housing 21: Inner insulator
22: Outer insulator 100: Conductor plate
30: terminal 31: upper conductor
31a: connection hole 32: middle conductor
32a: Radiative projection line 33: Lower conductor
33a: engaging projection 33b: engaging groove
33c: fitting groove 40: center conductor
41: long hole 42: side hole
50: heat radiating fin 51: heat radiating pipe
51a: heat dissipating blade N: nut
P1, P2: Packing

Claims (9)

An inner insulator 21 which is hermetically sealed inside and outside the transformer enclosure 10 with insulation oil and a terminal 30 which is connected to the outer conductor and is connected to the center conductor 40 inserted into the outer insulator 22. [ A method of manufacturing a terminal for a transformer bushing,
A step S10 of extruding a conductor plate 100 composed of a small-thickness upper conductor 31, a medium-thickness middle conductor 32 and a large-thickness lower conductor 33,
A step S20 of cutting the conductor plate 100 to have an equal width,
And a coupling groove 33b for inserting the center conductor 40 into the lower portion of the lower conductor 33 by drilling the connection hole 31a in the upper conductor 31 so that the external conductor is connected thereto And the step (S30) of finishing the terminal (30) by providing the engaging projections (33a) by lathe machining. The method according to claim 1,
Wherein the step S10 further comprises forming a heat radiating protrusion line (32a) in the longitudinal direction on the surface of the middle conductor (32) when the conductor plate (100) is extruded. The method according to claim 1,
The step of S30 further comprises a step of machining a fitting groove 33c for receiving the upper end of the outer insulator 22 between the rims of the coupling protrusions 33a and the lower conductor 33. [ Method of manufacturing a terminal. The method according to claim 1,
Wherein the step of S30 is such that the outer periphery of the lower conductor (33) is lathed so as to be circular as the outer periphery of the outer insulator (22). An inner insulator 21 which is hermetically sealed inside and outside the transformer enclosure 10 with insulation oil and a terminal 30 which is connected to the outer conductor and is connected to the center conductor 40 inserted into the outer insulator 22. [ The transformer bushing comprising:
The terminal 30 includes an upper conductor 31 having a small thickness in which a connection hole 31a is opened to connect the external conductor and a coupling protrusion 33b having a coupling groove 33b for receiving the center conductor 40, (33) having a large thickness and a middle conductor (32) having a medium thickness and gently connecting the upper conductor (31) and the lower conductor (33)
Characterized in that said middle conductor (32) further comprises a radiating protrusion line (32a) on its surface. 6. The method of claim 5,
Wherein the heat radiating protrusion line (32a) is formed in the transverse direction of the middle conductor (32). 6. The method of claim 5,
An elongated hole 41 through which the insulating oil is pierced in the longitudinal direction of the center conductor 40,
Further comprising a heat dissipating fin (50) fixed in the elongated hole (41) and directly radiating heat of the center conductor (40) while being in direct contact with the insulating oil. 8. The method of claim 7,
Wherein the heat dissipation fin includes a heat dissipation pipe inserted into the elongated hole and a heat dissipation vane extending in the longitudinal direction on the inner circumference of the heat dissipation pipe. bushing. 8. The method of claim 7,
Wherein the center conductor (40) further comprises a side hole (42) communicating with the elongated hole (41).

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