2013 Volume 133 Issue 12 Pages 1001-1008
IEC 61083-4, which is to be completed in 2013, defines requirements for a software which analyses a. c. and d. c. waveform parameters distilled from digitally measured data. TDG (Test Data Generator) attached to the 61083-4 simulates digitally recorded data for typical waveforms observed in daily measurement. Any acceptable software can determine waveform parameters within a given margin specified in IEC 61083-4. Authors could successfully analyse all the a. c. waveforms generated by the TDG using techniques, 1) FFT after an interpolation for steady a. c. and 2) a base curve for short-term a. c. The latter involves the least square method and a set of non-linear equations. The distilled parameters for both waveforms are within the specified margins (0.1% in peak value) proposed in IEC 61083-4. The details of the algorithm are to be clarified in the paper. Also mentioned in the paper is a proposed TDG's controversial behaviour in which a current-zero instant is shifted due to a discrete sampling interval.