What is overvoltage: A sudden rise in voltage for a short duration on the power system is known as overvoltage or voltage surge. Overvoltage is always temporary that exist for short period but that may cause damage to the power system due to surge in voltages. There are many causes for occurrence of overvoltage condition,… Read More: Overvoltage Protection Due to Lightning and Switching »
The phenomena of levitation of a magnet above a cooled superconductor is known as the Meissner Effect. If a superconductor is cooled below its critical temperature while in a magnetic field, the magnetic field surrounds but does not penetrate the superconductor. The magnet induces current in the superconductor which creates a counter-magnetic force that causes the… Read More: What is Levitation & Meissner Effect in Superconductivity »
Cable sizing is done based on three parameters: Load current, Short circuit current carrying capacity, Voltage drop. Below are given simple steps for performing cable sizing calculations. Step 1 – Calculate Load Current: Calculate the load current from the load data available. Formula is: I=Load (in kW)/(sqrt(3)V(in kV)p.f) (A) The current obtained has to derated… Read More: Cable Sizing & Voltage Drop Calculations Formula »
As a standard practice installer or contractor shall arrange for the witnessing of the following tests on the fully equipped switchboards (main, submain distribution boards and Motor Control Centers MCC) including primary bus bars and connections at the factory, in accordance with IEC 439-1: High voltage power frequency tests on main and auxiliary circuits Dielectric/insulation… Read More: Standard Checks & Tests for MDB, SMDB, DB & Motor… »
superconductor definition Before understanding the superconductor lets see what is superconductivity, it is the flow of electric current without resistance in certain metals, alloys, and ceramics at temperatures near absolute zero, and in some cases at temperatures hundreds of degrees above absolute zero = -273ºK. Therefore superconductor is the material having almost zero resistivity and… Read More: Everything about superconductor [Answered] »
A circuit breaker is a mechanical switching device, capable of making, carrying and breaking currents under normal circuit conditions. It is also capable of making and carrying currents for a specified time and breaking currents under specified abnormal circuit conditions, such as those of a short circuit. Air Blast Circuit Breaker is one of major… Read More: Air Blast Circuit Breaker | Construction & Operating Mechanism »