Electrical circuit protection system

摘要

A system to protect electrical circuits from rapid changes of voltage associated with a fault in an electrical load comprises an inductor placed in series between a drive circuit and load. The inductor is designed to be inefficient or lossy when the inductor core is magnetised. Magnetisation of the core only occurs when a rapid change in voltage is applied across the inductor coils. Because the inductor is inefficient, the induced impedance in the inductor increases rapidly during a fault event. The overall impedance of the circuit increases rapidly and the rapid change in voltage is dissipated at a rate associated with the CR constant of the circuit.