Quantitative analysis of the external radial magnetic field for detection of stator inter-turn short-circuit in induction machines

The aim of this paper is to show quantitatively how external radial magnetic field spectral lines vary when a short-circuit fault appears on induction machine stator winding. The sensitivity of the spectral lines to the fault is estimated by changing the ratio of the shorted turn current comparatively to the supply current. For a given position of the used sensor, the sensitivity of particular spectral lines is also analysed depending on the location of the fault in the stator winding