Aluminum alloy cable electrical performance

【China Aluminum Industry Net】 1. Cable Current Carrying Capacity When the cross-sectional area of ​​the alloy conductor is 1.5 times that of copper, the electrical properties of the alloy conductor and the copper conductor are the same, achieving the same ampacity, resistance, and pressure loss.

◆ The resistivity of aluminum alloy is between aluminum and copper, slightly higher than that of aluminum, but lower than that of copper. Under the premise of the same cutoff, the weight of aluminum alloy conductor of the same length is only half that of copper. If the conductivity of copper is calculated as 100%, the conductivity of the alloy conductor is about 61.2%, the specific gravity of the alloy is 2.7, and the specific gravity of copper is 8.9, then (8.9/2.7)×(0.612/1)=2, ie 2 The resistance per unit weight of copper is the same as the resistance of one unit mass of the alloy. Therefore, when the cross-sectional area of ​​the alloy conductor is 1.5 times that of copper, its electrical performance is the same, ie, the same cut-off, resistance, and voltage as that of copper are achieved. loss.

â—† There are many factors affecting the cut-off of the power cable, such as: line characteristics (such as working power, current type, frequency, load factor); wire and cable structure (such as the structure of the conductive core, the number of cores, the type of insulating material, shielding layer And outer and inner sheath structure and materials, total outer diameter); laying conditions (such as laying in the air, laying in the pipeline, laying directly in the ground, laying in the underground channel, laying in the bottom of the water); high allowable working temperature of the conductive core and Ambient conditions (such as air and soil temperature, coefficient of soil thermal resistance, proximity effect of surrounding heat sources), etc.

2. Reducing the outer cable cross-section of aluminum alloy During the production process of aluminum alloy cable, Germany's more advanced compaction technology enables the fill factor of the conductor to reach 93%. And aluminum alloy cable uses silane cross-linked polyethylene, this insulation only 2/3 of the thickness of PVC can far exceed the conventional insulation properties. The fill factor of copper can only reach 80%. Commonly used insulation is polyvinyl chloride, so the outer diameter of aluminum alloy cable is only increased by 11% on the basis of copper cable, which can have the same electrical properties of copper. It can be seen that the use of aluminum alloy cables does not need to change the original pipeline design using copper cables. (General designers design the laying pipe size to be 150% of the copper cable. Considering the problem of increasing capacity more recently, the size of the laid pipe is increased to 200% of that of the copper cable, so wearing the pipe is not a problem.)

3, reduce the cable loss of non-magnetic materials, will not generate eddy currents, can reduce the loss of the line. The aluminum alloy belt tie-lock material is a non-magnetic material, and even if there is a three-phase unbalanced current, no eddy current will be generated and the loss of the circuit can be reduced.

Stainless Steel Turnbuckles

Stainless steel nuts are components that tightly connect mechanical equipment, and can only be connected by screws on the inside, nuts and screws of the same specification. For example, M4-0.7 nuts can only be combined with M4-0.7 screws. (In the nut, M4 means the inner diameter of the nut is about 4mm, and 0.7 means the distance between the two threads is 0.7mm. );
The same is true for products made in the United States. For example, a 1/4-20 nut can only be combined with a 1/4-20 screw. (A 1/4 finger nut has an inner diameter of about 0.25" and 20 fingers have 20 teeth per inch. Features of Stainless Steel Round Nuts
Stainless steel nuts have the advantages of not easy to rust, anti-corrosion, thermal conductivity, and strong electrical conductivity. Another major use is injection, where it is embedded in plastic parts after heating, or injected directly from a mold.

Although many people may have used this stainless steel round nut, they do not really realize the importance and advantages of this nut. According to the introduction of the article, you should be able to understand what kind of characteristics this nut has. When a nut needs to be used in the future, it should be considered that such a nut plays a more important role.