What is difference between AC and DC Resistance of a conductor?

  What is difference between AC and DC Resistance?   The AC resistance is always more than the DC resistance. Let us understand what is the difference between AC and DC resistance.The resistance of the conductor is inversely proportional to the cross section area through which the current flows. The AC resistance is more than … Read more

Harmonics Mitigation Techniques

What is harmonics? Harmonics is a wave whose frequency is integral multiples of the fundamental frequency. The harmonics is a power quality problem that needs to be addressed during equipment selection. Also, harmonics mitigation using filters can be adopted for mitigating the harmonics in the existing installation. Equipment Selection: Speed control of the induction motor  … Read more

Why LV Winding Is Placed Next To The Core?

First let us understand the basic concept in order to understand the reason of placement of the LV winding nearer to core. In a three phase transformer the primary and secondary windings are placed around the core. The cross section area of the high voltage windings conductor is less as compared to the low voltage … Read more

What Is Voltage Unbalance?

Definition as per NEMA: The voltage unbalance is defined as the maximum deviation from the average of three phase voltage or current, divided by the average of the three phase voltage or current. The voltage unbalance is expressed in percent. According to NEMA (National Electrical Manufactures Association of USA) standard equation is as given below. … Read more