FIELD: electrical engineering.
SUBSTANCE: proposed device comprises single-phase voltage converter, unit selecting circuit healthy phase, and inverse sequence current filters, their number being equal to that of protected motors. It includes also electromagnetic relays, two per every motor and electromagnetic starters, two (first and second) per every motor, plus one per entire group of protected motors. Note here that, given incomplete-phase conditions originate in circuit supplying entire group of motors, the latter automatically change from faulty circuit over to supply from single- to multi-phase voltage converter. Given an incomplete-phase conditions in the circuit supplying directly protected motor, only the latter changes from faulty circuit over to supply from single- to multi-phase voltage converter, while remaining motors are supplied from main supply circuit, is its healthy.
EFFECT: expanded performances.
1 dwg
