myElectrical Tools

Traditionally substations have used circuit breakers, current transformers (CT), voltage transformers (VT) and protection relays all wired together using...

Carrying out a protection system discrimination study is critical to ensure the correct functioning of  the electrical system in the event of faults. ...

This is the first of two posts on the resistance of conductors. In the next post I will look at the ac resistance, including skin effect and we deal with...

Using software in our  work is essential for most of us and we are becoming even more dependant on it's use.  While software is a great asset, many times...

If two dissimilar metals are touching and an external conducting path exists, corrosion of one the metals can take place.  Moisture or other materials...

Visitors who like to type web address rather then click menus may be interested in how our URL structure works.

I have been thinking recently that there appears to be less professional integrity around than when I first started my career in electrical engineering...

Per unit fault calculations is a method whereby system impedances and quantities are normalised across different voltage levels to a common base.  By removing...

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

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