KR101315837B1 - Transformer using connection terminal using al cladded with cu, method of fabicating connection terminal using al cladded with cu and connection terminal using al cladded with cu using the same method - Google Patents

Abstract

The present invention relates to a transformer having a connection terminal for electrically connecting a power supply side or a line side line made of copper and a transformer winding made of aluminum.
The connection terminal is a part of the outside of the aluminum core is completely clad with copper, and the remaining part is an aluminum terminal partially clad with copper composed only of aluminum, the part clad with the copper is electrically connected to the power supply or line-side copper By providing a transformer characterized in that the portion consisting of only the aluminum is electrically connected to the winding of the transformer, while minimizing the copper consumption and having a variety of shapes, sizes and capacities, the manufacturing process is simple It is possible to provide an aluminum connection terminal clad with copper for a transformer having excellent characteristics.

Description

Transformer using aluminum cladding clad with copper, manufacturing method of aluminum cladding clad with copper and copper clad clad aluminum connecting terminal manufactured by the method TERMINAL USING Al CLADDED WITH Cu and CONNECTION TERMINAL USING Al CLADDED WITH Cu USING THE SAME METHOD}

The present invention relates to a transformer using an aluminum connection terminal clad with copper, a method of manufacturing an aluminum connection terminal clad with copper, and an aluminum connection terminal clad with copper manufactured by the method, and more particularly, to minimize copper consumption. To reduce the manufacturing cost and the price of the product, and to use the transformer connection part, which is partially clad with copper, to prevent potential corrosion between dissimilar metals in various sizes and shapes, and the method of manufacturing the aluminum connection terminal clad with copper. The present invention relates to an aluminum connection terminal clad with copper.

In general, the transformer is provided with an iron core in which the primary winding and the secondary winding are wound in the main body enclosure, and the high voltage and low voltage connection terminals are connected to connect the windings of the transformer and the external inlet and the outgoing lines.

On the other hand, the transformer is provided with a bushing (insulator) in the part where the high voltage is drawn and the part which is drawn out, the high pressure side is divided into a special high pressure bushing and a high pressure bushing according to the insulation water supply, and the low pressure side is divided into a low pressure bushing.

In this case, an enclosure having primary windings and secondary windings filled with insulating oil is generally referred to as an inflow transformer, and an enclosure not filled with insulating oil is called a dry transformer, and a molding process is performed without filling the enclosure with insulating oil. This is called a mold transformer.

At this time, the primary winding and the secondary winding are connected to the power supply side or the load side winding through the connection terminal. Typically, the primary winding and the secondary winding are made of aluminum, and external lead and lead wires (bushings) are usually made of copper.

In this case, the connection terminal is conventionally composed of 100% copper (Cu) regardless of the lower end of the terminal (part connected to the aluminum conductor of the transformer) and the upper end (part connected to the outer conductor (bushing)). There is a problem in that welding is difficult and dislocation corrosion between dissimilar metals occurs in a portion where copper and aluminum contact when bolting, and also because copper is expensive, manufacturing costs are high.

1A to 1C are schematic diagrams showing examples of connection terminals used in a transformer according to the prior art.

In order to improve the above disadvantages, in the prior art, as shown in Figure 1a, as the connecting terminal 100, the lower end of the terminal is composed of aluminum 102, the upper end is composed of copper 104, mechanically joining the two metals Although a junction terminal of copper and aluminum manufactured in such a manner is used, there is a disadvantage in that a defective rate of cutting the junction part is high when the electric current is supplied.

Therefore, as shown in FIG. 1B, in order to eliminate the junction, a connection terminal has been developed in which the entire connection terminal 100 is made of aluminum 102 and the copper plate 104 is formed in an explosion-pressure welding method or the like only on the upper surface of the aluminum. Since the process of the explosion welding method is difficult, the connection terminal 100 itself is expensive, and since the copper 102 is not formed on the side of the upper end, aluminum 102 is exposed, so that potential corrosion between dissimilar metals may occur later. There is a drawback to this.

In addition, as shown in Patent Application No. 2006-87896 and FIG. 1C, a circular aluminum tube is inserted into a copper tube, and it is extruded, drawn, or rolled into a square shape, and then the aluminum 102 core wire at the lower end thereof. A copper-clad aluminum core is disclosed that scrapes copper 104 formed on one surface to expose a portion of the lower surface of the aluminum core. This is referred to as copper aluminum core.

However, such copper-clad aluminum cores should all be coated with copper on the aluminum cores and then remove some portions of the copper cores. Also, copper (104) below the aluminum (102), the lower end of the aluminum (102) formed with the aluminum windings, and the copper (104) should be removed. ), There is a problem in that a large amount of copper is consumed, a manufacturing cost is high, a product is expensive, and a large capacity terminal is difficult to manufacture due to difficulty in manufacturing a large size connection terminal.

In addition, when bending, there is a possibility that a space may be generated between the copper 104 and the aluminum 102, and thus various types of terminals may not be manufactured.

The present invention is to solve the above problems, it is possible to produce a variety of terminals, while minimizing the copper consumption, even if connected to the transformer winding made of aluminum and the terminal formed of external copper in the transformer heterogeneous metal potential It is to provide a transformer having a connection terminal (secondary terminal) made of aluminum clad with copper which does not generate corrosion.

Another object of the present invention is to provide a method for manufacturing a connection terminal composed of aluminum clad with copper used in the transformer.

The present invention is to solve the above technical problem,

A transformer having a connection terminal for electrically connecting a power supply side or a line side line made of copper to a transformer winding made of aluminum,

The connection terminal is a part of the outer side of the aluminum is completely clad with copper, the remaining part is an aluminum terminal partially clad with copper consisting of only aluminum, the part clad with the copper is electrically connected to the power supply or line-side copper And a portion composed of only aluminum is electrically connected to a winding of the transformer.

The thickness of the clad copper is at least 10 μm and less than 35 μm.

The transformer is either a mold transformer, an inlet transformer or a dry transformer.

The clad copper is further plated with tin.

The aluminum has a flat surface without a step.

Further, according to the present invention,

Aluminum plates are ultrasonically washed in an alkaline solution,

 After washing several times with washing water, the surface of the aluminum plate is surface-treated with the surface treatment liquid,

After several washings, the surface is etched with alkaline solution,

After acid treatment with an acid degreasing agent, a zinc film is formed on aluminum to increase surface adhesion through zinc plating.

After washing, copper sulfate 150 to 250 g / l, sulfuric acid 50-80 g / l, chlorine ion 50-150 ml, current 1-10 A at a voltage of 1.5 to 6 V at a temperature of 20 to 40 ° C. It provides a method of manufacturing a connection terminal for a transformer clad with copper, including cladding copper to aluminum by plating copper to surround the.

The present invention also provides a connection terminal for a transformer clad with copper, which is produced by the above manufacturing method.

Therefore, the connection terminal of the present invention has no corrosion between dissimilar metals, the manufacturing process is simple, and copper can be clad even on aluminum plates of various shapes and sizes, so that connection terminals for transformers of high capacity and various applications can be manufactured. .

In addition, the production cost and cost can be reduced by minimizing the copper consumption.

In addition, even when the connection terminal is deformed, such as bending, there is an advantage that the adhesion does not fall between copper and aluminum.

1A to 1C are schematic diagrams showing examples of connection terminals used in a transformer according to the prior art.
2A is a side cross-sectional view of a mold transformer according to an embodiment of the present invention.
2B is a view for explaining the electrical connection of the mold transformer.
3 is a perspective view illustrating a connection terminal according to an embodiment of the present invention.
4 is a process flowchart for manufacturing the connection terminal of the present invention.

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

The copper-clad aluminum connection terminal in the present invention can be applied regardless of the type of transformer, but will be described based on a mold transformer for convenience of description.

Figure 2a is a side cross-sectional view of a mold transformer according to an embodiment of the present invention, Figure 2b is a mold transformer having a connection terminal to the electrical connection with the external low-side low-voltage line (low voltage bushing) and the power-side high-voltage line (high voltage bushing) It is a figure for demonstrating.

2A and 2B, a transformer 10 according to an embodiment of the present invention includes a low voltage terminal 10a, a high voltage terminal 10b, a primary winding 30 spaced apart from each other, and a secondary winding line. 40, the core 50, and the high-pressure connection 60.

One of the primary winding 30 and the secondary winding 40 is a high voltage winding, the other is a low voltage winding. In this case, the windings are made of aluminum. In the present embodiment, the primary winding 30 is a low voltage winding, and the secondary winding 40 will be described with respect to the high voltage winding.

In addition, the primary winding 30 is electrically connected to the low voltage terminal 10a, and the secondary winding 40 is connected to the high voltage terminal 10b.

On the other hand, as shown in Figure 2b, the load-side line (low voltage bushing; 20a) of the primary winding 30 is made of copper, the load side line (20a) of the primary winding 30 made of copper is the connection terminal It is electrically connected to the low voltage terminal 10a of the primary winding 30 through the (100).

3 is a perspective view illustrating a connection terminal according to an embodiment of the present invention.

Referring to FIG. 3, in the present invention, the connection terminal 100 uses a copper / aluminum heterocomplex conductor, part of which is clad with copper 104 on an aluminum 102 core, wherein the surface is made of copper 104. The upper end 104 of the partially clad connection terminal is electrically connected to the load side line 20a made of copper, and the aluminum part 102 of the lower end not clad with copper is made of the low voltage terminal 10a made of aluminum of the transformer body. Is electrically connected to the

At this time, it is preferable that the connection terminal 100 of the present invention composed of aluminum clad with some surface of copper is formed on the aluminum metal plate by a plating method. Therefore, since the connection terminal 100 used in the present invention clads the copper uniformly on the aluminum plate by plating, it is not necessary to remove copper formed at the lower end unlike the copper-clad aluminum connection terminal shown in FIG. 1C. Since there is no aluminum plate which can be formed by removing aluminum together when removing copper, the surface of the aluminum plate of the entire connecting terminal is formed flat.

At this time, the copper 104 of the cladding portion is formed to completely surround the aluminum 102. In addition, when the thickness of the cladding copper 104 is tested using KSD 2042: 2010 (weight method), it is possible to secure a conductivity of 97 or more if it is 10 μm or more, but preferably 25 μm or more for reliability. The thickness may be thick enough, but in consideration of economical efficiency, it is preferable to form a thickness of 50 μm or less.

The connection terminal 100 may include one or more through holes 106 in a portion where the copper 104 is clad. Accordingly, in the region in which the copper 104 is clad, even if it is electrically connected to the power supply side or load side line 20a formed of copper, corrosion by dissimilar metals does not occur, and the low voltage terminal 10a formed of aluminum of the transformer and Since the aluminum 102 part of the connection terminal 100 is electrically connected, this also does not cause corrosion by dissimilar metals.

The plating method of the connection terminal will be described with reference to FIG.

4 is a process flowchart for manufacturing the connection terminal of the present invention.

First, the aluminum plate is ultrasonically washed in an alkaline solution (S1). Subsequently, the surface of the aluminum plate is surface-treated with a surface treatment liquid after washing several times with washing water (S2). Subsequently, after washing several times, the surface is etched with an alkaline solution (S3). At this time, NaOH is used as the alkaline solution.

Then, after acid treatment with a degreasing agent (S4), to form a zinc film on aluminum to increase the surface adhesion through the zinc coating (S5).

Subsequently, after washing with water, current of 1 to 10 A was applied at a voltage of 1.5 to 6 V at 150 to 250 g / l of copper sulfate, 50 to 80 g / l of sulfuric acid, 50 to 150 ml of chlorine ion, and a temperature of 20 to 40 ° C. The copper is plated on a portion of the aluminum plate to clad the copper clad on the aluminum plate (S6). Thereafter, the aluminum connection terminal clad with the copper of the present invention is completed by post-treatment.

In this way, copper can be formed on a part of the aluminum surface in the case of a terminal formed of any type of aluminum, thereby minimizing the amount of copper used while preventing potential corrosion between dissimilar metals, thereby lowering manufacturing costs and costs. In addition, aluminum connection terminals including copper of various sizes and shapes can be manufactured.

In addition, in the case of mold transformers or dry transformers, tin plating may be performed on the copper.

In the case of tin plating, the process time can be shortened because it can be successively performed together with the copper plating process.

The tin plating process can be performed under normal process conditions.

As described above, the present invention provides an aluminum connection terminal clad with copper for a transformer having a simple shape and size, capacity, simple manufacturing process, and excellent characteristics, while minimizing copper consumption. Can be.

Meanwhile, although the copper-clad aluminum connection terminal described in the present invention has been described with an example of a transformer as an embodiment, it is applicable to both the copper terminal and the aluminum terminal to be connected in the power converter, and thus, an inverter, a converter, It is also applicable to power conversion devices such as rectifiers.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and variations without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas falling within the scope of the same shall be construed as falling within the scope of the present invention.

10: transformer 10a: low voltage terminal
10b: high voltage terminal 20a, 20b: load side line
30: primary winding 40: secondary winding
50: transformer core 60: high voltage connection
100: connection terminal 102: aluminum
104: copper 106: through hole

Claims (7)

A transformer having a connection terminal for electrically connecting a power supply side or a line side line made of copper to a transformer winding made of aluminum,
The connection terminal is a part of the outer side of the aluminum is completely clad with copper, and the remaining part is an aluminum terminal partially clad with copper consisting of only aluminum, the part clad with the copper is electrically connected to the line-side copper, A portion consisting of only aluminum is electrically connected to the terminal of the winding of the transformer. The method of claim 1,
The thickness of the cladding copper is 10 ㎛ or more, the transformer characterized in that less than 35 ㎛. The method of claim 1,
The transformer is any one of a mold transformer, an inlet transformer or a dry transformer. The method of claim 1,
The cladding copper is further plated with tin. The method of claim 1,
The aluminum is a transformer, characterized in that the flat surface without a step. Aluminum plates are ultrasonically washed in an alkaline solution,
After washing several times with washing water, the surface of the aluminum plate is surface-treated with the surface treatment liquid,
After several washings, the surface is etched with NaOH, an alkaline solution,
After acid treatment with an acid degreasing agent, a zinc film is formed on aluminum to increase surface adhesion through zinc plating.
After washing, copper sulfate 150 to 250 g / l, sulfuric acid 50-80 g / l, chlorine ion 50-150 ml, current 1-10 A at a voltage of 1.5 to 6 V at a temperature of 20 to 40 ° C. A method of manufacturing a connection terminal for a transformer clad with copper, comprising cladding copper on aluminum by plating copper to cover the copper. delete

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