Patent ID: 7456601
Filing Date: 2008-11-25
Classification: H02P

Abstract:
1. A system for starting and regulating a wound rotor motor having a stator connected by an AC bus through a stator isolation breaker to an AC power source and a rotor from a period of inactivity until voltage generated by the rotor of the motor falls to a predetermined point, comprising: a low voltage source inverter having one input and one output; at least one starting resistor having an input and an output, the input of which is connected to the rotor of the motor and the output of which is connected to the input of said low voltage source inverter; a starting bypass contactor having an input and an output, the input of which is connected to the rotor of the motor and the output of which is connected to the input of said low voltage source inverter; a voltage source converter having one input and one output, the input of which is connected by a bidirectional DC bus to the output of said low voltage source inverter; and protective means for protecting said voltage source converter from faults and for lowering voltage from the AC bus wherein said protective means has an input connected to the output of said voltage source converter and an output connected to the AC bus.