A DC-link decoupling circuit is provided in combination with two inverters which are connected in parallel to a common DC power supply line and each of which inverter driving one different traction motor, switch means being provided for each of said two inverters, for separating the corresponding inverter from said power supply line in case of failure.
The said DC-link decoupling circuit is provided with resonance oscillation attenuating/damping means in the form of an RL filter (resistor-inductor filter).
The invention relates also to an electric locomotive comprising at least two electric motors, each motor being controlled by one of two inverters, each of which inverters is powered by a common power supply line, switch means being provided for each of said two inverters, for separating the corresponding inverter from said power supply line in case of failure.
DC-link decoupling means are provided for decoupling the resonance condition of inverters, which means consist of an RL filter having a damping inductor and a damping resistor in parallel.