A method of processing stray flux data associated with a synchronous electrical machine by means of a system comprising a data capture module, a data analysis module and a database, the method comprising: capturing, by the data capture module, stray flux data from the synchronous electrical machine on run up or run down of the synchronous electrical machine; generating, by the data analysis module, a stray flux waveform using at least the captured stray flux data; analysing, by the data analysis module, the generated stray flux waveform and the captured stray flux data comprising: determining a capability chart associated with the synchronous electrical machine; determining rotor zero flux crossings from at least the stray flux waveform, the rotor zero flux crossings being those points at which flux sensitivity is at a maximum level; applying the rotor zero flux crossings to the capability chart; and plotting the rotor zero flux crossings on the capability chart; storing the generated stray flux waveform and the captured stray flux data in the database; determining, by the data analysis module, when the captured stray flux data or the generated stray flux waveform is at a zero stray flux crossing that corresponds to a particular rotor slot; determining, by the data analysis module, a Megawatt Megavolt Ampere, MW MVA operating point for the generated stray flux waveform associated with the determined zero stray flux crossing that corresponds to the particular rotor slot; plotting, by the data analysis module, the determined MW MVA operating point on the capability chart; plotting, by the data analysis module, a line on the capability chart from a rotor slot zero stray flux crossing line origin through the plotted determined MW MVA operating point associated with the determined zero stray flux crossing that corresponds to that particular rotor slot; determining, by the data analysis module, rotor slot information, the rotor slot information being indicative of leading and lagging rotor slots; determining, by the data analysis module, the number of shorted turns in a particular leading and lagging pole coil pair; and determining, by the data analysis module, if symmetrical inter-turn faults are present in a rotor of the machine from the rotor slot information. capturing, by the data capture module, stray flux data from the synchronous electrical machine on run up or run down of the synchronous electrical machine; generating, by the data analysis module, a stray flux waveform using at least the captured stray flux data; analysing, by the data analysis module, the generated stray flux waveform and the captured stray flux data comprising: determining a capability chart associated with the synchronous electrical machine; determining rotor zero flux crossings from at least the stray flux waveform, the rotor zero flux crossings being those points at which flux sensitivity is at a maximum level; applying the rotor zero flux crossings to the capability chart; and plotting the rotor zero flux crossings on the capability chart; determining a capability chart associated with the synchronous electrical machine; determining rotor zero flux crossings from at least the stray flux waveform, the rotor zero flux crossings being those points at which flux sensitivity is at a maximum level; applying the rotor zero flux crossings to the capability chart; and plotting the rotor zero flux crossings on the capability chart; storing the generated stray flux waveform and the captured stray flux data in the database; determining, by the data analysis module, when the captured stray flux data or the generated stray flux waveform is at a zero stray flux crossing that corresponds to a particular rotor slot; determining, by the data analysis module, a Megawatt Megavolt Ampere, MW MVA operating point for the generated stray flux waveform associated with the determined zero stray flux crossing that corresponds to the particular rotor slot; plotting, by the data analysis module, the determined MW MVA operating point on the capability chart; plotting, by the data analysis module, a line on the capability chart from a rotor slot zero stray flux crossing line origin through the plotted determined MW MVA operating point associated with the determined zero stray flux crossing that corresponds to that particular rotor slot; determining, by the data analysis module, rotor slot information, the rotor slot information being indicative of leading and lagging rotor slots; determining, by the data analysis module, the number of shorted turns in a particular leading and lagging pole coil pair; and determining, by the data analysis module, if symmetrical inter-turn faults are present in a rotor of the machine from the rotor slot information.