Variable frequency drives are widely used to control the speed of ac motors.  This note looks at the mechanisms which enable drive units to control the...

A load flow study is the analysis of an electrical network carried out by an electrical engineer. The purpose is to understand how power flows around...

If you have no idea how electrical circuits work, or what people mean then they talk about volts and amps, hopefully I can shed a bit light.  I’m intending...

Most installations involve some form of lightning protection system which is connected to an earth electrode.  The function of the earth electrode is to...

In three phase systems, the use of transformers with three windings (or legs) per side is common.  These three windings are often connected in delta or...

GE have put together a time-lapse video shown flight take-off and landings at some airports. An interesting view:

This post is quick introduction and overview to different railway electrification voltages used in answer to a question sent in via email. While there...

It wasn't so long ago I was telling someone that I don't use rules of thumb as most things are easily calculated anyhow.   As it turns out I last week...

We've been sending out Newsletters on a regular basis for a few weeks now. To do this we have been using Google's Feedburner service. While Feedburner...

Following on from my post on railway electrification voltages, I thought an introduction to traction substations would be a good idea. Traction substations...