The phenomenon of ionization of surrounding air around the conductor, hissing noise and production of Ozone gas in an overhead transmission line is known as Corona Effect. Corona discharge is a process by which a current flows in a conductor with a high potential into a neutral fluid, usually air, by ionizing that fluid so… Read More »
In this method of inter-connection the similar ends either the ‘start’ or ‘finish’ are joined together at point N. This common point N is called star point or neutral point. Ordinarily only three wires are carried to the external circuit giving 3-phase, 3-wire star connected system but sometimes a fourth-wire, known as neutral wire is… Read More »
The opposition to flow of electrons (due to bonds between protons and electrons, as well as to collisions) is called a electrical resistance (R). Or Resistance may also be defined as “The property of the electric circuit which opposes the flow of current”. The practical unit of electric resistance is ohm (.Q). It (ohm) is… Read More »
Electrical wiring generally refers to insulated conductor used to carry current including the associated devices. Domestic electric appliances like lights, fans, washing machines, water pumps etc are connected to the supply through insulated wires which are controlled by switches. The wiring diagram gives the connections of different appliances to the supply within a house or… Read More »
Overhead transmission lines are classified based on the manner in which the capacitance is considered. Common classification is long, short and medium transmission lines. Short Transmission Lines Transmission lines whose length less than 80kms and operating voltage less than 20kV comes under short transmission line. Due to the smaller distance and lower voltage levels capacitance… Read More »
Bundled Conductors For transmission of more power for long distances to load centers Extra High Voltage (EHV) transmission is employed. Implementing Extra High Voltage has advantage of reduction in the copper losses and improves efficiency. However transmission of voltage beyond 300kV will poses some problems such as Corona effect which causes significant power loss and… Read More »