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...

When current flows within a wire, a magnetic field is created. The potion of this magnetic field perpendicular to the wire is called the magnetic flux...

It's been a busy few months on different projects or busy couple of decades depending on how I look at it. I can say that on the odd (frequent) occasion...

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

When selecting a generator, there are inherent limits on the active and reactive power which can be delivered. Generators are normally sized for a certain...

The following tables provide quick order of magnitude fault levels for a a range of typical low voltage situations.

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

In the previous note we looked at the approach taken by the standard to the sizing of cables and illustrated this with an example.  We then looked at one...

Many questions sent in to the site are in connection with motor starting and in particular star-delta.  For all but the simplest application, there is...

Lead acid batteries are cost effect and reliable, making them suitable for many applications.This note examines topics of interest associated with the...