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 »
The rated voltage ratio of the transformers at no load normally is specified at 50 Hz, this being related to the principal tapping of the transformer. Tapping shall be provided on the primary winding to provide a ratio variation of +7.5% and –2.5% in steps of 2.5%. The tap charge mechanism is of the off load… Read More »
What is a Transistor The transistor is a three-layer semiconductor device that consists of: two n-type layers and one p-type layer of material which is called npn transistor two p-type layers and one n- type layer of material which is called an pnp transistor There are two basic types of transistors i.e.bipolar junction transistor or… Read More »
Before discussing the types and importance of busbar protections let’s see what is a bus bar? The word bus is derived from Latin word “OMNIBUS” that means common for all, so busbar is actually a common and main part of a power distribution system that serves as nerve center of the power system where various… Read More »
Single Phase power circuits Single phase electric power or circuit refers to the distribution of alternating current electric power using a system in which all the voltages of the supply vary in corresponding exactly. Single-phase distribution is used when loads are mostly used for the purpose of lighting and heating which can also be for… Read More »
What is a Diode? Di+Ode is a semiconductor device with two terminals allowing the flow of current in one direction only, diodes are made up of Silicon, Germanium & GaAs. The perfect diode would be a perfect conductor in one direction (forward bias) and a perfect insulator in the other direction (reverse bias). In many situations, using… Read More »