| 摘要 |
FIELD: aircraft engineering. ^ SUBSTANCE: proposed four-channel backup power supply system that can be used, for instance, in three-phase ac power system ensuring power supply to all pieces of equipment in case of failure of any of four channels, each of its channels incorporating generator and line contactor with make-and-break contacts, is assembled of three main and one backup channels; each main channel is provided with bus connected to generator through make contact of line contactor, external power supply connector, and second contactor with make-and-break contacts; backup channel is provided with second contactor incorporating make contact inserted between break contact of back-up channel line contactor and one of connectors; make contacts of second contactors of main channels are interconnected through connectors, their common leads are connected to break contacts of line contactors, and break contacts of second contactors are interconnected and connected to common lead of back-up channel line contactor. In this way preflight training is made using three airfield power supplies (and not four as in prior-art systems) and only one power supply is required for optimizing on-board pieces of equipment using minimal quantity of contactors. ^ EFFECT: reduced number of airfield power supplies required for optimizing on-board equipment and for preflight training. ^ 1 cl, 2 dwg |
