DEVICE FOR ALTERNATE STARTING OF ELECTRIC-MOTOR GROUP Russian patent published in 2006 - IPC H02P1/58 

FIELD: electrical engineering for any fields of national economy such as starting heavy-power units in gas and oil industries.

SUBSTANCE: proposed device for alternate starting of electric motor group has sectionalized three-phase supply mains; first three-phase switching apparatuses, first, second, and third inputs of each of them being connected to one of phase leads of respective section of supply mains; three-phase motors, input of first, second, and third stator phase winding leads of each of them being connected, respectively, to first, second, and third outputs of respective first switching apparatus; second three-phase switching apparatuses; third three-phase switching apparatuses, first, second, and third inputs of each of them being connected, respectively, to first, second, and third inputs of respective second three-phase switching apparatus, these apparatuses being connected to outputs of respective first, second, and third phase windings of respective three-phase motor and first, second, and third outputs of every third three-phase switching apparatus being interconnected; three-phase starting bus whose first, second, and third phase leads are connected, respectively, to first, second, and third outputs of every second three-phase switching apparatus; starting current limiter whose first, second, and third inputs are connected, respectively, to first, second, and third phase leads of starting bus.

EFFECT: enlarged functional capabilities and provision for starting heavy-power motors supplied with power from different sections of supply mains.

1 cl, 3 dwg