**Laplace Transform**
Laplace transforms and their inverse are a mathematical technique which allows us to solve differential equations, by primarily using algebraic methods...

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

**Power Factor**
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)...

**Electromechanical Relays**
Electromechanical relays have been the traditional backbone of electrical protection systems. While over recent years these have been replaced by microprocessor...

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

**Photovoltaic (PV) - Utility Power Grid Interface**
Photovoltaic (PV) systems are typically more efficient when connected in parallel with a main power gird. During periods when the PV system generates energy...

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

**IEC 60287 Current Capacity of Cables - An Introduction**
IEC 60287 "Calculation of the continuous current rating of cables (100% load factor)" is the International Standard which defines the procedures and equations...

**Contribute to myElectrcial**
Have an opinion or something to say, want to ask or answer questions, share your knowledge then use our site to do it . As a community of people interested...

**Lightning Risk Assessment (IEC 62305)**
IEC 62305 'Protection against lightning' requires a risk assessment be carried out to determine the characteristics of any lightning protection system...