Measurement uncertainty of the negative-sequence current indicator for stator inter-turn faults: extracted indicator values and analysis scripts

Extracted quantities and analysis code underlying the manuscript "Measurement uncertainty of the negative-sequence current indicator for stator inter-turn faults, calibrated against the measured shorted-loop current", submitted to Measurement Science and Technology. The measurements were made on a three-phase wound-rotor induction machine, 0.3 kW, 230/400 V, 50 Hz, 798 turns per phase, star-connected with the neutral bonded, at no load and supplied directly from the 400 V grid. Phase-A taps allow short circuits of 20, 40, 80, 160, 240 and 320 turns. Seven repetitions were recorded for each of the seven machine states, giving 49 records, using ACS712 Hall-effect transducers and a National Instruments USB-6218 converter at 16 bit and 20 kHz per channel. Two data files are provided. The first gives the complex ratio of negative to positive sequence current for every record at eight analysis window lengths from 20 ms to 3 s. The second gives, for each record, the fundamental frequency, the duration, the RMS shorted-loop current, the RMS positive-sequence current and the normalised ampere-turn deficit used in the calibration model. The MATLAB scripts reproduce every figure and every number reported in the paper from these files, and require no toolbox. No raw current waveform is included: the host laboratory data policy does not permit public deposition of the raw records.