Increase in Reliability of Frequency Converters of Rolling Mill

The article presents ways to improve reliability of semiconductor frequency converters. It is shown that an increase in reliability of semiconductor converters can be achieved increasing the power reserve. At the same time, if the economic indicator is chosen as an optimization criterion, the coefficient of failure-free operation reaches no more than 0.8. In case the resulting coefficient of failure-free operation is allowed, according to operating conditions, a selected criterion can be successfully applied at the design stage of semiconductor converters.