Random paralleling of aircraft alternators

MANY large aircraft in use today have constant-frequency electric power systems. The alternators in several of these systems can be operated in parallel and the procedure of connecting machines together electrically usually involves synchronizing and paralleling. Here synchronizing means bringing the machines into proper frequency and phase position, while paralleling is electrically connecting the machine armature circuits through a switching device. The terminal voltages will be held within satisfactory limits by the automatic voltage regulators.