Electromagnetic processes

Electromagnetic processes in transformers during their disconnection by vacuum switches

The influence of the operation of vacuum switches on the electromagnetic processes of transformers of distribution networks has been studied. It is shown that during the disconnection of transformers from the network with the connection scheme of the windings "Wye/Wye, with neutral brought out for grounding" causes significantly higher multiples of overvoltages in the windings than the disconnection of transformers with the connection scheme of windings "Delta/ Wye, with neutral brought out for grounding".

Mathematical model of a semiconductor converter with eight-zone regulation of output voltage

In this article the analysis of electromagnetic processes in electrical circuits with semiconductor switches has been performed. A mathematical model for analysis of electromagnetic processes in semiconductor converter with pulse-width regulation of output voltage has been developed. Time diagrams reflecting electromagnetic processes in electrical circuits are presented.