Inter turn fault detection on rotating machines
Sweep Frequency Response Analysis (SFRA) is used to detect inter turn faults caused by mechanical stress in the pole windings and stator windings of electrical machines.
The electrical circuits in the stator and in the rotor are complex network of capacitance, inductances and resistors with their own frequency response. Any defects in the windings result in a change of the corresponding frequency response.
Measuring this frequency response and comparing it between different poles or previous measurements enables the detection of faults.