Category Archives: Electric Current

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What is Levitation & Meissner Effect in Superconductivity

cooper pair in Meissner effect and BCS theory

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 & Voltage Drop Calculations Formula

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 »

Standard Checks & Tests for MDB, SMDB, DB & Motor Control Center

lv switchgear panels installation method

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… »

Everything about superconductor [Answered]

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] »

Air Blast Circuit Breaker | Construction & Operating Mechanism

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 »

Method Statement for Installation of Isolated Power Supply IPS Units

Below is given a brief method statement for Installation of Isolated Power Supply units or also called IPS Units. Pre installation requirements before commencing the installation work at site are: Operative to attend any site induction provided by the client. Check the power cables and earth cable sizes are done as per approved drawings. Conduits,… Read More: Method Statement for Installation of Isolated Power Supply IPS Units »