METHOD AND APPARATUS FOR AN ASYNCHRONOUS STATIC SWITCH

摘要

This invention concerns a method for switching a load between two or more asynchronous electrical supplies. The method switches on the second supply when the instantaneous magnetic flux within the load is equal to the instantaneous magnetic flux that would be produced by the second supply. By ensuring that the load flux continues unchanged as the second supply is switched on, heavy in-rush currents due to direct current flux bias are prevented. In a second aspect the invention provides an apparatus for switching a load between two or more asynchronous electrical supplies.