Procedure and interconnection arrangements to reduce problems with third-party flows which may arise in the generator and engine operation of alternating current machines connected to a three-way distribution or transmission network

摘要

Connection arrangements are employed for reducing the effect of third-hannonic voltages in case of direct connection of AC machines to a three-phase distribution or transmission network, wherein the stator winding of the AC machine is Y-connected and wherein the neutral point of the winding is available. An exemplary embodiment employs a suppression filter turned to the third-harmonic, with an overvoltage protection device arranged between the neutral point and ground of the power network.