The busbar adopts copper bar or aluminum bar, which has high current density, low resistance and small skin effect, and no derating is required. Small voltage drop means small energy loss, which ultimately saves the user’s investment. For cables, since the cores are multiple thin copper wires, the root area is larger than that of the busbars of the same current level. And its “collection effect” is serious, which reduces the rated current, increases the voltage drop, and is prone to heat. The line energy loss is large, and it is easy to age.