Open Neutral: Voltage Fluctuation and Stray Voltage
Open neutral or broken neutral on a service transformer or service cable into a facility can result in serious overvoltage…
Auto Recloser and Power Quality
What is a recloser? Recloser is an automatic self-controlled and self-contained device used by electric utility companies to disconnect power…
How to identify Capacitor switching transients?
Power capacitor bank switching at utility or industrial power system can lead to current and voltage transients and can be…
Voltage Swell due to Line-Ground Fault
Voltage Swell is defined by IEEE as increase in RMS voltage from 110% to 180% of nominal voltage at power…
Harmonic Resonance in Power Systems
Harmonic currents produced by non-linear electronic loads are injected in to the power system grid. The effect of injecting large…
Wye and Delta Connection Vector Diagram
In this article wye (star) and delta connection is discussed with respect to line-line, line-neutral voltages and currents. Additionally, the…
Line Reactor vs Isolation Transformer
Line Reactor Line reactor as used in VFD/VSD application is an inductive component used in the line side or supply…
Calculating Phase Difference Between Two Waves
Often we will have two sinusoidal or other periodic waveforms having the same frequency, but is phase shifted. To calculate…
Why Use an Isolation Transformer?
Isolation transformers are used in drive (VFD / VSD) as well as many other applications to provide any of the…
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