A method for measuring the fundamental frequency component of a fault current or voltage, including measuring a fault current or voltage signal, which includes a DC-offset, a characteristic frequency component, a fundamental frequency component, and harmonics, with a predetermined sampling period, filtering...http://www.google.fr/patents/US6597160?utm_source=gb-gplus-shareBrevet US6597160 - Method for measuring fundamental frequency component of fault current or voltage signal
Method for measuring fundamental frequency component of fault current or ...
