INTEGRATING SYNCHRONIZATION OF THE THYRISTOR CONTROLLER AS THE STAFF ELECTRICAL SAFETY INCREASING DEVICE
A brief analysis of the causes of failures of rectifier converters led by network is given. It is mentioned that the weak link of their structures is synchronizers subjected to interference effects from the power supply.The principle of thyristor AC voltage controller (TVC) based on synchro-phase-shifting device is considered. It combines the functions of controller, synchronizer, phase-shifting device and high-frequency pulse packet generator for thyristor controlling. TVC power unit is made on a “Thyristor - Diode” scheme. A functional diagram of TVC designed for discretely controlled induction motor drives is shown. TVC works on the principle of limiting the induction motor inrush current at a predetermined level. The article presents the block diagram of the control system and the synchronization channel based on integrating sweep converters (SC). The conditions of the SC synchronization by the harmonic signal and bipolar rectangular pulses with an average zero value are determined. The authors give the main analytical relations describing the SC static mode. The ability of the synchronized SC to adapt to the voltage parameters is mentioned. The paper also presents the signal diagrams of the synchronization channel and the analog signal to the power thyristors control angle converter.The main results of industrial application TVC are summarized. It is noted that due to the reconstructionelectrical equipment failures and staff injuries were stopped.