Renewed ESMOGrid now offers even more functionality with improved and modern graphical user interface that ensures much more efficient system modeling from any device with internet connection. Now with ESMOGrid you can perform the most important electrical power systems calculations, analogical to those performed by expensive power systems modeling programs, however, ESMOGrid offers you an[…]
An electric substation is a junction point of transmission lines or power generators and an electric system. Substations are equipped with power transformers to change voltage level.
It is common to use several smaller rated transformers connected in parallel instead of one bigger rated transformer in electrical power systems.
In electrical power systems neutral conductor can be grounded or isolated. The connection of neutral conductor has a substantial influence on line to earth and line to line with earth connection short circuits that are the most common faults in electrical systems. In this article we will describe the main differences between isolated neutral and[…]
Cable sizing is a common task for electrical system engineers. A proper cable is chosen by verifying several conditions that it needs to meet.
Short – circuit is an electrical system fault, when electrical path occurs within two or more conductive elements and, consequently, potential difference between them becomes close to zero. There are several types of short – circuits:
Usually the very first aspect electric power engineers have to evaluate when analyzing transmission, distribution or industrial power system is load flows. What is more, nowadays, load flow analysis become a powerful tool for designing domestic scale microgrids with renewable energy power plants.
Harmonic distortion is “pollution” in the electric power systems. When talking about harmonics, it is usual to distinguish current and voltage harmonics, however, both of those exist together. All power electronic devices such as variable frequency drives, power inverters and other non – linear loads inject harmonic currents into the grid.
In AC power systems along with active power there is always reactive power. Reactive power is either generated or consumed by system elements that have inductive or capacitive reactance (transformers, generators, motors, capacitors, transmission or distribution lines and others). While reactive power is important for some of these elements to operate, it also causes power losses[…]
The protection coordination task requires protection sensitivity checks. For over-current protection, sensitivity is the relation of fault and protection pick-up currents. However, over-current protection sensitivity highly depends on fault type: three phase, two phase, phase to ground, two phase and ground fault. Phase currents during a ground fault differ from phase currents during phase to phase faults. For that purpose[…]