Overvoltage is one of the most common types of electrical interferences in power supply systems. Significant part of overvoltages is caused by switching off the high inductive load, such as transformers, reactors and electrical machines. This paper is dedicated to vacuum circuit breakers switching off process modeling in Simulink MATLAB for the purpose of power quality problems estimation. Model of the vacuum circuit breaker implements simulation of transient recovery voltage, current chopping and electrical arc. Developed model was used for simulation of overvoltage on example of mine electric power system. Obtained results were compared to available experimental data.
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