Transmission System

The electrical energy generated at the power stations is conveyed to the consumers through a network of transmission and distribution systems. In the power system, the electrical energy generated at the power stations is conveyed to major sub-stations. From the major sub-stations, it is conveyed to the bulk power consumers by high voltage distribution system […]

Corona Effect in Transmission Lines It can be noticed that near the overhead lines, there exists a hissing noise and sometimes a faint violet glow. The effect due to which such phenomenon exists surrounding the overhead lines is called the corona effect. When a normal alternating voltage is applied across two conductors with enough spacing

When the load is supplied there are line losses due to the resistance of the line conductors. Therefore, the power received at receiving end is always less than the sending end voltage. Efficiency of Transmission Line The ratio of receiving end power to the sending end power of a transmission line is called the transmission

A steady direct current flowing through the conductors is uniformly distributed over the whole cross-section of the conductor. However, an alternating current flowing through the conductor does not distribute uniformly, rather it tends to concentrate near the surface of the conductor as shown in the figure. This is known as skin effect in transmission line.

The supporting structure for overhead lines is required to keep the bare conductors at a suitable level above the ground. These may be various types of poles or towers. They should have following essential properties: Types of Poles in Transmission Line The following are main types of poles and towers generally used in the overhead

The overhead line conductors are supported on the poles or towers. In order to prevent the flow of current to earth through supports, the line conductors must be properly insulated from supports. This is achieved by securing line conductors to supports with the help of overhead line insulators. These insulators provide necessary insulation between the line

The cost of conductor material is a vital part of the total cost of a transmission line. Therefore, the calculation of the conductor size of a transmission line is very important. The economic size of conductor is determined by Kelvin’s law. It is used to find out the most economical area of x-section of a

The transmission of electric power over long distances was developed at the beginning of the twentieth century. Since then, it has made rapid progress in its design and methods of operation, which has resulted in greater reliability and continuity. The electric power can be transmitted either by means of an AC or DC system. Each