Power transmission Power transmission requires a large […]
Power transmission requires a large amount of high-conductivity copper, mainly used for power wires and cables, bus bars, transformers, switches, connector components and connectors.
During the transmission of wires and cables, power is wasted due to resistance heating. From the perspective of energy saving and economy, the "best cable section" standard is currently being promoted in the world. In the past, the popular standard, from the perspective of reducing the investment in one installation, in order to minimize the cable cross-section, to achieve the minimum allowable size of the cable without dangerous overheating at the rated current required by the design. Cables laid according to this standard, although the installation cost is low; but in the long-term use, the resistance energy consumption is relatively large. The "Best Cable Section" standard takes into account both the installation cost and the power consumption. The cable size is appropriately enlarged to achieve energy saving and optimal overall economic benefits. According to the new standard, the cable cross section is often more than doubled than the old standard, and the energy saving effect of about 50% can be obtained.
In the past period of time in China, due to the shortage of steel supply, considering that the proportion of aluminum is only 30% of copper, aluminum-based copper has been adopted in overhead high-voltage transmission lines that want to reduce weight. Underground cable. In this case, aluminum has a disadvantage of being less conductive and having a larger cable size than copper, and is dwarfed.
For the same reason, replacing the old aluminum winding transformer with an energy-efficient copper winding transformer is also a wise choice.