myElectrical

Microsoft OneNote

A couple of months ago I came Microsoft's OneNote and downloaded the 60 day free trail. Since then I have been using it regularly and now have a full license. If you don't know what OneNote is, the best way to see how it works is to download the free trail and have a go.

Microsoft's describes the software as:

Complex Power

Real, reactive power and power factor can be explained using different concepts.  Sometimes it is convenient to use the concept of complex power.  In an electrical system, if the voltage and current are treated as vectors, these can be expressed in complex numbers.  The complex power S, of the system is then given by:

Lightning Protection and Earth Electrode Resistance

Most installations involve some form of lightning protection system which is connected to an earth electrode.  The function of the earth electrode is to dissipate the lightning strike safely in to the ground.  Often the performance of the earth electrode is specified and verified by stating a maximum resistance and ensuring that the installed system meets this.  Resistance is easily understood and an easy property to measure.  However, it is only indicative of the performance of the earth electrode under lightning conditions.  Other parameters have a more signification effect.

1,000 kV UHV First for China

At the beginning of the year China put the world's first 1,000 kV UHV transmission system into operation. Transmitting power at over a million volts is just amazing.  Some key facts about the system are: