Skin effect of single core cable
When there is alternating current or alternating electromagnetic field in the conductor, the current distribution inside the conductor is not uniform, and the current is concentrated in the "skin" part of the conductor, that is, the current is concentrated on the thin layer of the outer surface of the conductor. The closer to the surface of the conductor, the higher the current density. The actual current inside the conductor is small. As a result, the resistance of the conductor is increased, so that its power loss is also increased. This phenomenon is called the skin effect. When the single-core cable is in alternating current or alternating electromagnetic field, the skin effect is obvious and the line loss is increased.
Advantages of multi-core cable
Multi-core cable refers to a cable with more than one insulated core, which reduces the skin effect of the cable and reduces the loss of the line.