Скачать или смотреть AC and DC resistance for underground cable Borneo Sarawakian EE

The AC resistance of a conductor for an underground cable refers to the resistance of the conductor to the flow of alternating current (AC) through it. The AC resistance is different from the DC resistance because AC current produces an alternating magnetic field that interacts with the conductor and causes skin effect and proximity effect, which increase the effective resistance of the conductor. Skin effect refers to the concentration of current flow near the surface of the conductor due to the magnetic field, which reduces the effective cross-sectional area of the conductor and increases its resistance. Proximity effect refers to the interaction of magnetic fields between adjacent conductors, which affects the distribution of current and increases the resistance of the conductors.

The AC resistance of a conductor is measured in ohms and is affected by the frequency of the AC current, the material and cross-sectional area of the conductor, and the arrangement of the conductors in the cable. In general, the AC resistance of a conductor is higher than its DC resistance, and it becomes more significant at higher frequencies. Therefore, it is important to consider the AC resistance of conductors when designing and selecting underground cables for power transmission systems.

DC resistance of a conductor is the resistance offered by the conductor to the flow of direct current (DC) through it. It is measured in ohms and is determined by the material, cross-sectional area, and length of the conductor. The resistance is proportional to the length of the conductor and inversely proportional to its cross-sectional area, which means that longer and thinner conductors have higher resistance compared to shorter and thicker conductors. DC resistance is an important factor to consider in power transmission systems because it determines the amount of power loss due to resistance in the conductors. Therefore, minimizing the DC resistance of the conductor is important to increase the efficiency of power transmission systems.