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 … [Read more...] about Types of Underground Cables
Cables
Skin Effect in Wires, Cables and Transmission Lines
In this post, we will look at what is skin effect, its causes and the factors affecting it. In short, the 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 … [Read more...] about Skin Effect in Wires, Cables and Transmission Lines
Insulating Materials for Power Cables
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 … [Read more...] about Insulating Materials for Power Cables
Air Break Switch – Types and Uses
An "air break switch' is a switchgear device that uses air as the dielectric. Air Break Switches (ABS) are widely installed throughout distribution networks for use as both isolation or switching points. They are usually employed in outdoor installations. Special Arcing Horns … [Read more...] about Air Break Switch – Types and Uses
Construction of Underground 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 … [Read more...] about Construction of Underground Cables
Insulation Resistance Test (IR Test) or Megger Test
Insulation Resistance or IR Test is carried out by maintenance engineers to ensure the healthiness of the overall insulation system of electrical equipment. It reflects the presence or absence of harmful contamination, dirt, moisture, and gross degradation. IR value will … [Read more...] about Insulation Resistance Test (IR Test) or Megger Test