Professional Answer: The main difference is their function and the voltage they carry. transmission lines are the "highways" of the electrical grid; they transport high-voltage electricity over long distances from power plants to regional substations. In contrast, distribution lines are the "streets" that deliver lower-voltage electricity from these substations to individual customers. At Ningbo Changshi, we manufacture and export a wide array of tools and equipment specifically designed for the safe and efficient construction and maintenance of both high-voltage transmission and lower-voltage distribution lines.