Research On Cylinder Linear Induction Motor Operating Mechanism Used In High-Voltage Circuit Breaker

High-voltage circuit breaker operating mechanism is one of the most important components of circuit breaker. Cylinder linear induction motor (C-LIM) operating mechanism, a new type of Motor Drive operating mechanism, is introduced in this thesis. The Motor Drive has the following advantages: one moving part, simple and reliable. no mechanical auxiliary contacts needed; low mechanical noise level; response quickly; optimal, pre-programmed travel curve; condition monitoring. Motor Drive offers a completely new and versatile operate way to high voltage circuit breakers.The main content of this thesis is as follows:The electromagnetic design of C-LIM, in view of the rated 40.5kV of vacuum circuit breaker, is discussed which under different construction and parameters influence. The Neighbourhood Topology Particle Swarm Optimization with evolutionary calculation and swarm intelligence is proposed used in the C-LIM optimal design by mechanism movement form and design demand.Magnetic transient behaviour of optimized C-LIM is simulated. C-LIM with dissimilar slot number per pole, gap length and secondary material is studied. Magnetic induction intensity and magnetic lines of flux are discussed using different secondary material when C-LIM starting at a given time, meanwhile the ampere densily and air-gap induction are analysed still. In addition the influence of gap length and secondary material attribute on the thrust and velocity of C-LIM is studied.An equivalent circuit model in the rotor flux oriented frame is developed for the vector control of C-LIM by adding the dynamic vertical ending effect function, and mathematical model of C-LIM is established according to ideal velocity curve of circuit breaker moving contact. The simulation results show the improvements achieved by the proposed scheme, the thrust being satisfied for system needs and stabilization.The application of the linear servo motor to high-voltage circuit breaker operating mechanism, using DSP control system and vector control strategy, is proposed. The new technology, based on servo control system of C-LIM mechanism adopting closed loop of current inner loop and velocity outer loop design, exceeds the benefits offered with conventional operating mechanisms while at controlling high precision, large start thrust and good matching thrust of C-LIM mechanism and load of circuit breaker.C-LIM model, which is the first one in domestic, is successful in putting it through a test on circuit breaker rated 40.5kV and satisfy requirements. The test result is shown to optimize circuit breaker contact travel, improve reliability. The servo control system of C-LIM mechanism can expand easily and enhance technical level of mechanism.