Control theory looks at how systems work and are controlled from a mathematical view.  This note gives a brief introduction to some of the concepts – more...

The windings of many medium and small sized transformers are protected by restricted earth fault (REF) systems. The illustration shows the principal of...

This is the second post in a series of two on periodic electrical inspections. In the first post, I discussed how often inspections should be carried out...

A single phase system is perhaps the most common type of system most people are familiar with. This is what people have in their homes and what appliances...

The other day I came across an article in Technology Review on the development of a smart transformer. A professor at North Carolina State University is...

Electrical notes are a collaborative collection of electrical engineering information and educational material. Any registered user can add content. ...

If you are working on a large plan, get the real coordinates [latitude, longitude] for two or more points and add them to the drawing. That way you can...

Often document control is dictated by project requirements, for example a particular organisation may have an existing numbering system. Existing company...

Years ago I was told that you should always try to write the best report you can.  Many years later I still think on this as one of the better pieces of...

Insulation on a motor prevents interconnection of windings and the winding to earth.  When looking at motors, it is important to understand how the insulation...