Patent ID: 8862435

Claim:
An intelligent electronic device (IED) for recording at least one waveform of an AC power system, the IED comprising: a voltage input circuit operative to sense line voltage from the AC power system and generate at least one voltage signal representative of the voltage sensed from the AC power system; at least one analog-to-digital converter circuit configured to sample the at least one voltage signal to output digital samples representative of said voltage input circuit; at least one processor operatively coupled to said analog-to-digital converter and configured to perform at least one mathematical computation on samples received from the analog-to-digital converter; at least one volatile memory operatively coupled to said at least one processor to receive samples from the analog-to-digital converter; and at least one plug-in type non-volatile memory operatively coupled to said at least one processor, wherein the at least one processor is configured to transfer samples from the at least one volatile memory to the at least one non-volatile memory upon an event.