Circuit breakers, protection relays and busbars form the operating core of an electrical distribution system. The breaker interrupts current, the relay decides when interruption is necessary, and the busbar carries…
Le dimensionnement des transformateurs ne se résume pas à diviser la charge totale par un pourcentage. Une sélection fiable convertit la charge réelle en kVA, applique la demande et la diversité, vérifie les moteurs et les harmoniques, tient compte de l'environnement et de l'avenir...
High voltage allows electric power to move long distances with lower current and lower conductor losses, but it also increases insulation, clearance, protection and safety requirements. This guide explains what voltage…
Un disjoncteur miniature, plus formellement appelé disjoncteur divisionnaire (MCB), protège les circuits finaux basse tension contre les surcharges et les courts-circuits. Il peut être réarmé après la correction du défaut, mais il doit être choisi pour…
An electrical distribution system transfers power from a utility connection or generator through substations, transformers, switchgear, panels and cables to the final loads. Good design delivers acceptable voltage,…
A step-up transformer raises alternating voltage from the primary side to the secondary side. For approximately the same apparent power, the higher-voltage side carries lower current. Step-up units connect generators…
Converting kVA to amps is one of the most common calculations in transformer, generator, cable and switchgear selection. The arithmetic is simple, but the result is only correct when the phase arrangement and voltage…
A power factor correction capacitor supplies reactive power close to an inductive load, reducing the reactive current drawn from the utility. Correctly applied, a capacitor bank can lower current, release transformer…
What is a substation? An electrical substation is a controlled point in a power system where electricity is transformed, switched, protected, measured, and routed. It connects generation and transmission networks to…
A transformer changes alternating voltage through electromagnetic induction. If a transformer raises the voltage, it will reduce the current for approximately the same transferred apparent power, excluding losses.…