Abstract Highly sensitive electrical equipment represented by AC contactor is applied extensively in power system. Serious consequences and associated losses would be caused subsequently by contactor false tripping derived from voltage sag triggered by thunder-strike and short circuit. In this context, this paper discusses the energy conversion of the electromagnetic systems as the foundation of proposing a voltage sag protection topology based on seamless switching for AC contactor. The reverse external voltage turn-off characteristic of thyristor is utilized in the proposed topology. Therefore the exciting current is consecutive, enough energy could be obtained to maintain the closure of contactor during the switching procedure between the main control circuit and the alternate control circuit under voltage sags. Additionally, the control method of switching process are addressed. Detailed simulations and experiments have been carried out to validate the correctness and effectiveness of the proposed topology, as a theoretical and practical reference for uninterrupted operation of highly sensitive electrical equipment during consecutive industrial manufacturing.
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2018, Vol. 33 
