Patent ID: 7768253

Claim:
An intelligent electronic device comprising: a sampling module that samples one or more analog characteristics of a power transmission system, the sampling module comprising at least one input circuit for sampling a respective analog characteristic, the input circuit comprising: a scaling circuit that reduces magnitude of the analog characteristic to a desired level; an isolating circuit that creates an electrical barrier between respective upstream and downstream portions of the input circuit; an analog to digital converter that digitizes the analog characteristic to produce a 1-bit serial digital data stream, the scaling circuit being electrically connected to an input of the analog to digital converter, and the isolating circuit being electrically connected directly to an output thereof; wherein the sampling module further comprises a digital signal processing module in series with the isolating circuit and comprising a digital filter that digitally filters the 1-bit serial digital data stream and a resampling module that re-samples the filtered data stream output from the digital filter, and wherein the intelligent electronic device further comprises an additional processing module in series with the digital signal processing module, the digital signal processing module producing packets of samples at a sample rate required by the additional processing module, parameters of the digital filter and a period of the resampling module being both configured by the additional processing module to suit a particular algorithm.