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 an Electric Motor? An electric motor is an electromagnetic device that converts electrical energy into mechanical energy by applying the law of electromagnetic induction. The first ever electric motor was invented by William Sturgeon in 1832 which was not promoted as for commercial purposes. First commercially successful electric motor was created in 1873.… Read More »
Resistance definition & Meaning Understanding of resistance is very basic requirement for electrical engineers or professionals, the question of resistance comes when we are talking about the conductors, metals, wires or cables etc. Electrical resistance in general is a measure of the difficulty to pass through electric current from any conductor. So in simple words we can… Read More »
You can download the o&m manual or operation manual for 48 V DC Battery & Charger for 11KV Switchgear which is given for Chloride models and provided by Emerson Network Power. Download Link for o&m manual is given at the end of this page which contains full detail about the operating instruction of the battery charger.… Read More »
What is a VFD? As the name describes VFD or Variable Frequency Drive is motor controller that drives an electric motor by applying the varying frequency and voltage to the electric motor that are used in the case where we need to change the speed of motors depending upon the load requirements. Other names for… Read More »