When selecting a cable, the performance of the cable under fault conditions is an important consideration. It is important that calculations be carried...

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...

Fault calculations are one of the most common types of calculation carried out during the design and analysis of electrical systems. These calculations...

Coils of wire on the rotor carry a d.c. current which generates a magnetic field. A stator magnetic field is created using either permanent magnets or...

Power factor is the ratio between the real power (P in kW) and apparent power (S in kVA) drawn by an electrical load. The reactive power (Q in kVAr)...

Modelica is an open source (free) software language for modelling complex systems. Having never used it before, I thought I would download a development...

It wasn't so long ago I was telling someone that I don't use rules of thumb as most things are easily calculated anyhow.   As it turns out I last week...

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...

I'm a fan of using manufacturers catalogues. There are two main reasons for this. Firstly, if your involved in the purchase of equipment, you will likely...

Problems on achieving maximum voltage drop within an installation come up often. Depending where you live, local regulations will have different limits...