Vyrovets S. Monostable Polarized Electromagnets with Improved Forced Characteristics for Medium Voltage Actuators of Commutation Apparatus

The dissertation is devoted to the development and further improvement of the monostable polarized electromagnet with high-coercive permanent magnets with displacement of the magnetic flux into the air shunt region for the actuator of medium voltages vacuum switching devices with improved power characteristics. The analysis of design features of medium voltages vacuum circuit breakers and their actuators is performed. The new design of the monostable electromagnet with high-coercive permanent magnets for a medium voltage vacuum switch actuator with improved power characteristic is developed. Recommendations for choosing a parts size of the magnetic circuit and the size of permanent magnets to create the holding force of the electromagnet anchor when the winding is deenergized is not less than the specified one is developed. Also, the winding data of the electromagnet based on the known counteraction force is determine. A feasibility of using the ferromagnetic shunt in the working gap of the developed design of a polarized monostable electromagnet is defined and recommendations for choosing the linear dimensions of the ferromagnetic shunt is developed. The mathematical model of dynamic processes of switching on and off monostable polarized electromagnets with high–coercive permanent magnets with displacement of the magnetic field into the air shunt region is researched and improved. An experimental research of processes in the developed design of a polarized monostable electromagnet with high–coercive permanent magnets for a vacuum switch actuator is made. the reliability of the calculated research results is confirmed experimentally. The influence of the parameters of the capacitive energy storage device on the ability of implementation the automatic re–activation mode by the switch is determined.