EVCOME EV charging stations for better life---Top EV charging stations manufacturers & suppliers in China.
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EVCOME EV charging stations for better life---Top EV charging stations manufacturers & suppliers in China.
As we all know, copper cable is a kind of wire and cable with very good performance, which can adapt to the application of almost any system. However, my country's copper resources are relatively short, and copper cables cannot be fully covered. So today we will learn whether aluminum alloy wire and cable can be applied to medium voltage systems. 1. The conductivity of aluminum alloy cables is relatively poor. The conductivity of aluminum alloy cables is only 61% of that of copper cables. Under the same cable cross-section, excessive resistance will inevitably lead to excessive line damage and reduce energy utilization efficiency. 2. Aluminum alloy cable has low load flow. The power grid requires the cable to quickly switch the load to the opposite line to ensure uninterrupted power supply for users. However, in order to achieve high reliability and perfect network structure of the power grid, excellent equipment and lines are essential. The power supply lines in the power grid must have high current-carrying capacity, and in addition to their own load, they should also be able to withstand temporary switching loads. The current carrying capacity of the copper core cable of the same section is more than 30% higher than that of the aluminum alloy cable, which can obviously meet the reliability requirements of urban power supply. 3. The mechanical tensile strength of aluminum alloy cables is low. The tensile strength of aluminum alloy cables is only 46% of that of copper cables, and the allowable traction force is lower than 60% of that of copper cables. A large number of urban distribution networks adopt a cable ring network structure, and the use of cable intermediate joints is minimized in planning and design. In fact, the laying length of single-core copper cables is generally between 600-800m. Considering the same current-carrying capacity, the laying length of a single-core ordinary aluminum cable is only 500m, and that of a single-core aluminum alloy cable is only 350m. Obviously, due to the low tensile strength and limited length of a single traction cable, a large number of intermediate joints need to be added, which increases the risk of subsequent operation and maintenance. In addition to the above characteristics, aluminum alloy wires and cables also have the characteristics of weak corrosion resistance, poor high temperature resistance, high risk of joint failure, high channel resource occupation, and high conductor installation process requirements, which make aluminum alloy wires and cables unsuitable for medium voltage systems. .
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