TWI623944B - Copper and aluminum alloy used together - Google Patents

Abstract

The invention relates to a method for using copper and aluminum alloy, and proposes to retain a bulk oxide layer of copper and aluminum alloy (the oxide layer is very thin and the resistance is small) as an isolation protective layer to prevent electrochemical reaction, copper and aluminum alloy (such as aluminum-magnesium alloy). The rare earth aluminum alloy) is a lap joint. Through the splitting of the isolation protective layer, the copper and the aluminum alloy form two relatively independent but equal potential conductors, and electromagnetic interference is not generated between each other, and the uniformity of the current density distribution is greatly improved. The method of using copper and aluminum alloy is suitable for use in conductors of wire and cable, busbars, transformers, switches and bushings of various voltage levels.

Description

Copper and aluminum alloy used together

The invention relates to a method for using copper and aluminum alloy in combination with wires of various voltage grades of wires and cables, bus bars, transformers, switches and bushings.

In order to improve the current carrying capacity and reduce the cost, the existing wire and cable and busbar industries have proposed high-strength copper-clad aluminum cable conductors, expanded-diameter steel-cored aluminum stranded wires, hollow cables, high-voltage hollow cables, combined conductor structure power cables, multi-split copper or Aluminum busbar. But still did not find a more effective way to reduce costs and increase the current carrying capacity. The conductors of the above series are made of copper, aluminum, copper clad aluminum, and insulated conductors between copper and aluminum. The disadvantages are:

1 copper has a small current carrying capacity, high temperature and high cost.

2 Aluminum has a small current carrying capacity, and the temperature rises. The conductivity and copper ratio of aluminum are relatively poor and easy to oxidize.

3 copper-clad aluminum has a small current carrying capacity and a high temperature. The copper-clad aluminum process is complicated and is metallurgical. (The prior art copper and aluminum must be combined with metallurgical or electrochemical reaction.) The adhesion of copper and aluminum is copper. It is not integrated with aluminum and is a whole, and the current density distribution is not uniform. Compared with copper-clad aluminum wire, copper wire with equal diameter is larger than copper-clad aluminum wire. Copper-clad aluminum cable with equal diameter is not energy-saving compared with copper cable, and waste copper-clad aluminum wire and cable is recycled. The copper-aluminum separation process is complicated and the pollution is serious.

Disadvantages of 4 multi-split copper or aluminum busbars: small current carrying capacity, high temperature rise, copper and aluminum There is insulation isolation, copper-aluminum electrochemical reaction is solved, but copper and aluminum are two independent conductors, which are not equipotential, and the electromagnetic fields between the two conductors interfere with each other and reduce the current carrying capacity.

The object of the present invention is to overcome the shortcomings of the prior art, and propose to retain the bulk oxide layer of copper and aluminum alloy (the oxide layer is very thin and the resistance is small) as an isolation protective layer to prevent electrochemical reaction, copper and aluminum alloy (such as aluminum-magnesium alloy). The rare earth aluminum alloy) is a lap joint. Through the splitting of the isolation protective layer, the copper and the aluminum alloy form two relatively independent but equal potential conductors, and electromagnetic interference is not generated between each other, and the uniformity of the current density distribution is greatly improved.

A technical solution for achieving the object of the present invention: a method for using copper and aluminum alloy in the invention is: 1 for a circular conductor, the outer conductor is copper, the inner conductor is an aluminum alloy, and the bulk oxide layer of copper and aluminum alloy is used as isolation. Protective layer, the conductor structure has copper sleeve aluminum alloy rod (large diameter is rod, diameter less than 5mm is the line), copper sleeve aluminum alloy tube, copper stranded aluminum alloy wire, expanded diameter copper twisted aluminum alloy stranded wire, copper stranded steel core aluminum Alloy stranded wire, expanded diameter copper stranded steel core aluminum alloy stranded wire; 2 rectangular conductor is copper outside, aluminum alloy strip (row) is in the middle, and the bulk oxide layer of copper and aluminum alloy strip (row) is used as the isolation layer. The above conductor may be provided with an insulating layer or a mask insulating layer on the conductor depending on the voltage level.

The beneficial effects of the invention are: a copper and aluminum alloy is used in combination with the bulk oxide layer of copper and aluminum alloy as the isolation protective layer, and the copper and aluminum alloy are lap joint, and the current density distribution is more uniform than copper, aluminum, Copper-clad aluminum (copper-aluminum metallurgical combination), insulated conductors between copper and aluminum should be good. Compared with the copper sleeve aluminum alloy wire, the copper wire of the first-diameter copper wire has a large current carrying capacity and a low temperature rise; the copper bar of the second-diameter copper bar has a current carrying capacity compared with the copper-clad aluminum alloy bar. Large, low temperature rise; 3 equal diameter, equal section of copper tube and copper sleeve aluminum alloy tube, copper sleeve aluminum alloy tube with large current carrying capacity, low temperature rise; 4 equal diameter copper stranded wire and copper stranded aluminum alloy wire In comparison, the copper stranded aluminum alloy wire has a large current carrying capacity and a low temperature rise. The conductor formed by the combination of copper and aluminum alloy has a larger current carrying capacity and a lower temperature rise than the conductor isolated from copper, aluminum, copper clad aluminum and copper aluminum. The application of the metal oxide layer as an isolation protective layer achieves an energy-saving effect of increasing the current carrying capacity, lowering the temperature rise, and reducing the cost.

1‧‧‧ copper sleeve

2‧‧‧Aluminum rod

3‧‧‧Expanded foam

4‧‧‧Steel wire

5‧‧‧Aluminum alloy tube

6‧‧‧copper wire

7‧‧‧Aluminum alloy strand

8‧‧‧Bronze

9‧‧‧Aluminum alloy belt

10‧‧‧Aluminum alloy row

The invention will now be further described with reference to the accompanying drawings.

Figure 1 is a schematic view of a copper sleeve aluminum alloy rod of the present invention.

Figure 2 is a schematic view of a copper sleeve aluminum alloy tube of the present invention.

Figure 3 is a schematic view of a copper stranded aluminum alloy wire of the present invention.

Figure 4 is a schematic view of the expanded diameter copper stranded aluminum alloy wire of the present invention.

Figure 5 is a schematic view of a copper stranded steel core aluminum alloy strand of the present invention.

Figure 6 is a schematic view of the expanded diameter copper stranded steel core aluminum alloy strand of the present invention.

Figure 7 is a schematic view of a rectangular conductor of the present invention.

Figure 8 is a schematic view of a rectangular conductor of the present invention.

The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings.

As shown in FIG. 1 , a method for preparing a copper sleeve aluminum alloy rod and a wire by using a copper and an aluminum alloy according to the present invention: retaining the bulk oxide layer of the copper sleeve 1 and the aluminum alloy rod 2, and placing the copper sleeve 1 On the aluminum alloy rod 2, the copper sleeve 1 and the aluminum alloy rod 2 are mechanically coupled by a rolling mill, and the copper sleeve 1 is in surface contact with the aluminum alloy rod 2. The above copper sleeve 1 can also be made of copper strip material. The copper strip is evenly coated on the aluminum alloy rod, and the seam of the copper strip is welded into the copper sleeve 1. The wall thickness of the copper sleeve 1 depends on the magnitude of the current (0.1 mm - 10 mm), and the diameter of the aluminum alloy rod 2 depends on the magnitude of the current (1 mm - 100 mm). The above conductor may be provided with an insulating layer or a mask insulating layer on the conductor depending on the voltage level.

According to the above production process, the copper sleeve aluminum alloy rod can be made into a sleeve and a bus bar, and the copper sleeve aluminum alloy wire can be made into a wire and cable.

As shown in FIG. 2, a method for using copper and aluminum alloy according to the present invention to produce a copper sleeve aluminum alloy tube method: retaining the bulk oxide layer of the copper sleeve 1 and the aluminum alloy tube 5, and placing the copper sleeve 1 in the aluminum alloy tube 5, the copper sleeve 1 and the aluminum alloy tube 5 are mechanically joined by a rolling mill, and the copper sleeve 1 is in surface contact with the aluminum alloy tube 5. The copper sleeve 1 can also be made of a copper strip, and is evenly coated on the aluminum alloy tube with a copper strip, and the seam of the copper strip is welded into the copper sleeve 1. The copper sleeve aluminum alloy tube can also be brought into contact with the mechanical joint surface by expanding the diameter of the aluminum alloy tube. The wall thickness of the copper sleeve is determined according to the current (0.1 mm - 10 mm), and the diameter and wall thickness of the aluminum alloy tube 5 are determined according to the current (diameter: 3 mm - 1000 mm, wall thickness: 0.5 mm - 50 mm). The copper sleeve aluminum alloy tube with the outer diameter of 30mm or less can be filled with foamed plastic, plastic and plastic tube; the outer diameter of the copper sleeve with the outer diameter of 10mm or less can be filled with foamed plastic, plastic, and the conductor after filling the plastic. It can be used for conductors of wire and cable. The above conductors may be provided with an insulating layer or a mask insulating layer on the conductor according to the voltage level.

According to the above production process, the copper sleeve aluminum alloy tube can be made into a casing, a bus bar, a wire and cable.

As shown in FIG. 3, a method for preparing a copper-stranded aluminum alloy wire by using a copper and an aluminum alloy according to the present invention: retaining the bulk oxide layer of the copper strand 6 and the aluminum alloy strand 7, in the aluminum alloy strand 7 The upper twisted copper stranded wire 6 and the cross-sectional area of the copper stranded wire 6 may account for 10% to 90% of the total cross-sectional area of the copper-stranded aluminum alloy wire according to the current. The above conductors are required according to the voltage level An insulating layer or a mask insulating layer is applied to the conductor.

According to the production process of the above method, the copper stranded aluminum alloy wire can be made into a cable and a soft busbar.

As shown in FIG. 4, a method for preparing a copper-reinforced aluminum alloy wire with a copper alloy and an aluminum alloy according to the present invention: retaining the bulk oxide layer of the copper strand 6 and the aluminum alloy strand 7, and expanding the diameter of the material The foamed plastic 3 is used to form a round bar, which can also be made into a tube, and the aluminum alloy wire 2 is stranded on the round bar, and the copper stranded wire 6 is twisted on the expanded aluminum alloy wire 2, and the copper stranded wire 6 is The cross-sectional area may account for 1% to 90% of the total cross-sectional area of the expanded copper wire aluminum alloy wire according to the current. The cross-sectional area of the expanded diameter accounts for 1% to 90% of the total cross-sectional area of the expanded copper wire aluminum alloy wire. The above conductor may be provided with an insulating layer or a mask insulating layer on the conductor depending on the voltage level.

According to the production process of the above method, the expanded copper wire aluminum alloy wire can be made into a cable and a soft bus.

As shown in FIG. 5, a method for preparing a copper stranded steel core aluminum alloy strand by using a method of using copper and an aluminum alloy according to the present invention: retaining the bulk oxide layer of the copper stranded wire 6 and the steel core aluminum alloy stranded wire 7 The stranded wire 4 is stranded with the aluminum alloy wire 7, and the copper stranded wire 6 is stranded on the stranded steel core aluminum alloy stranded wire 7. The cross-sectional area of the copper stranded wire 6 can account for 10% to 90% of the total cross-sectional area of the steel core copper-stranded aluminum alloy wire according to the current. The above conductor may be provided with an insulating layer or a mask insulating layer on the conductor depending on the voltage level.

According to the above production process, the copper stranded steel core aluminum alloy strands can be made into soft busbars and overhead lines.

As shown in FIG. 6 , a method for preparing an expanded diameter copper stranded steel core aluminum alloy strand by using a copper and an aluminum alloy according to the present invention: retaining the bulk oxide layer of the copper strand 6 and the steel core aluminum alloy strand 7 Extruding the foamed plastic 3 on the steel strand 4 for circular expansion, stranding the aluminum alloy wire 2 on the circular expanded foam 3, and twisting the copper strand on the expanded aluminum alloy wire 2 line 6. The cross-sectional area of the copper stranded wire 6 may account for 1% to 90% of the total cross-sectional area of the expanded-diameter steel core copper-stripped aluminum alloy wire according to the current. The cross-sectional area of the expanded diameter accounts for 1% to 90% of the total cross-sectional area of the expanded-diameter steel-core copper-stripped aluminum alloy wire. The above conductor may be provided with an insulating layer or a mask insulating layer on the conductor depending on the voltage level.

According to the production process of the above method, the expanded diameter copper stranded steel core aluminum alloy stranded wire can be made into a soft bus bar and an overhead wire.

As shown in Fig. 7, a method for producing a rectangular conductor by using a method of using copper and an aluminum alloy according to the present invention: retaining the bulk oxide layer of the copper 8 and the aluminum alloy strip 9, and stacking the aluminum alloy strip 9 between the two coppers 8. The cross-sectional area of the copper 8 may account for 1% to 90% of the total cross-sectional area of the rectangular conductor according to the current. The above conductor may be provided with an insulating layer or a mask insulating layer on the conductor depending on the voltage level.

As shown in Fig. 8, a method for using a copper and an aluminum alloy in the present invention to produce a rectangular conductor is as follows: a copper oxide sleeve and a bulk oxide layer of the aluminum alloy rod are retained, and the copper sleeve is sleeved on the aluminum alloy rod [the wall of the copper sleeve The thickness is determined according to the current (0.1mm-10mm), the diameter of the aluminum alloy rod is determined according to the current (1mm-100mm)], and the copper sleeve aluminum alloy rod is pressed into the copper 8 aluminum alloy row 10 through the rolling machine; Two: retaining the bulk oxide layer of the copper sleeve and the aluminum alloy rod, uniformly coating the aluminum alloy rod with a copper strip, welding the seam of the copper strip into a copper sleeve, and pressing the copper sleeve aluminum alloy rod into copper 8 through a rolling machine Aluminum alloy row 10. The cross-sectional area of the copper 8 may account for 1% to 90% of the total cross-sectional area of the rectangular conductor according to the current. The above conductor may be provided with an insulating layer or a mask insulating layer on the conductor depending on the voltage level.

According to the production process of the above method, the rectangular conductor can be used to make a busbar and a transformer coil.

Claims (5)

A method for using copper and aluminum alloy, characterized in that: a bulk oxide layer of copper and aluminum alloy is retained as an isolating protective layer, and the copper and the aluminum alloy are lap joint; wherein the copper sleeve (1) is placed over A copper sleeve aluminum alloy tube is formed on the aluminum alloy tube (5), and the copper sleeve aluminum alloy tube tube having an outer diameter of 30 mm or less is filled with plastic. The method for using copper and aluminum alloy according to claim 1, wherein the copper sleeve (1) has a wall thickness of 0.1 mm to 10 mm, and the aluminum alloy is 0.1 mm to 10 mm. The diameter of the rod (2) depends on the current, and is 1 mm to 100 mm. The method for using copper and aluminum alloy according to claim 1, wherein the copper sleeve (1) has a wall thickness of 0.1 mm to 15 mm, which is 0.1 mm to 15 mm. The diameter and wall thickness of the tube (5) are determined according to the magnitude of the current, and the diameter is 1 mm to 1000 mm, and the wall thickness is 0.1 mm to 50 mm. A method for using copper and aluminum alloy, characterized in that: a bulk oxide layer of copper and aluminum alloy is retained as an isolating protective layer, and the copper and the aluminum alloy are lap joint; wherein the strand is twisted through the steel strand (4) The alloy wire (7), stranded copper stranded wire (6) on the stranded steel core aluminum alloy stranded wire (7) to form a copper stranded steel core aluminum alloy stranded wire, the copper stranded wire (6) cut The area can account for 10% to 90% of the total cross-sectional area of the steel-core copper-stranded aluminum alloy wire according to the current. The method for using copper and aluminum alloy according to item 4 of the patent application scope, wherein the foamed plastic is extruded on the steel strand (4) for use as a circular expansion diameter; the expanded diameter copper stranded steel core aluminum alloy stranded wire, The cross-sectional area of the expanded diameter accounts for the expanded diameter steel core copper stranded aluminum The total cross-sectional area of the alloy wire is 1% to 90%.