Neutral Grounding
Introduction In power system, grounding or earthing means connecting frame of electrical equipment (non-current carrying part) or some electrical part of the system (e.g. neutral point in a star-connected system, …
Effect of Voltage on Induction Motor Characteristics
Whenever the voltage at the terminals of an induction motor varies from its nameplate rating, either performance or life is sacrificed.The effect may be minor or serious depending upon the …
Voltage Drop Calculations
In 2008, I have written some articles on voltage drop calculations as a tool in the selection of the correct cable sizes. Voltage Drop Calculation; Voltage Drop Calculation Part 2; …
Earth Fault Higher Than Three Phase Fault
In a power system, almost always three phase fault current is higher than the earth-fault current. However, earth fault current near the generator is higher than three phase fault. What …
Negative Sequence Currents – Causes, Effects and Protection
What is a Negative Sequence Current? Negative sequence current is defined as a type of unbalanced current that occurs in a three-phase electrical system. In a balanced three-phase system, the …
Ventilation Requirements for Stationary Battery Rooms
Almost always, stationary battery rooms ventilation is an argument among engineers. However, seldom do their reasoning are based on scientific evidence to prove their position. IEC std 62485 provides a …