Study of Conditions for Group Self- Starting High-Voltage Electric Drives in Turbo Mechanisms

The conditions for self-starting high voltage electric drives at voltage swing have been studied. The drivers remain connected to the busbar during the voltage swing. Thus, the running out of the electric drives during the quiescent periods is group and determined by the inertia moment and the rate of generated voltage run down in the most high-powered drive of the disconnected group. If the group includes synchronous electric motors, the rundown of others is commonly determined by the characteristics of the most powerful of them. The latter under normal operating conditions have the electromotance close to the voltage value in the network and at the rundown its value decreases slower than in induction motors. When the voltage in the supplying network recovers the residual electromotive force in these motors is significant and the total inrush current is determined by the phase shift in the system and the motor electromotance. If the variation between phase angles is 180°, then the inrush will be the most significant, when the phase angles are similar the inrush is minimal. The results of simulation experiments in the form of mathematical models for operational schemes: boosters - high voltage electric drives - turbo mechanisms - industrial pipelines are applied in developing practical self-starting circuits for high voltage electric drives.