Cables

In practice, different types of underground cables are generally required to deliver 3-phase power. For the purpose, either three-core cable or three single core cables may be used.    For voltages upto 66 kV, 3-core underground cable (i.e., multi-core construction) is preferred due to economic reasons. However, for voltages beyond 66 kV, 3-core-cables are not preferred because … [Read more...] about Types of Underground Cables

In this post, we will look at what is skin effect, its causes and the factors affecting it. In short, current flow over the surface of the conductor is called skin effect. The reason behind this is explained in the remaining section of this post. When dealing with low current dc hobby projects, wires and cables are straightforward they act as simple conductors with … [Read more...] about Skin Effect in Wires, Cables and Transmission Lines

We have already discussed the construction of underground cables in the previous article. In this article, we will discuss the different types of cable insulation materials used in underground power cables. Insulation is a non-conductive material, or a material resistant to the flow of electric current. It is often called a dielectric in radio frequency cables. … [Read more...] about Insulating Materials for Power Cables

An underground cable essentially consists of one or more conductors covered with suitable insulation and surrounded by a protecting cover. Although several types of underground cables are available, the type of cable to be used will depend upon the working voltage and service requirements. In general, a cable must fulfill the following necessary requirements :  The … [Read more...] about Construction of Underground Cables