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

This morning I was explaining how differential protection works to a junior engineer. To give him something to read I opened up the NPAG (Network Protection...

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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...

From the earliest times, humans have found ways to create light. Pre-historic peoples used natural materials (moss, grass, etc.) soaked in animal fat and...

Just added a page to the tools, which will allow you to calculate the synchronous speed, slip and rated torque for an induction motor. Not a particularly...

I was reminded of Occam's Razor while reading a book. It's quite a simple principal of logic which has stood the test of time and is accepted as central...

IEC 60287 "Calculation of the continuous current rating of cables (100% load factor)" is the International Standard which defines the procedures and equations...

Anyone specifying or using electric motors should have a basic understanding how the insulation is related to temperature. Three classes of insulation...