Patent ID: 8234085

Claim:
A method for processing data pertaining to an activity of partial electrical discharges taking place in a three-phase electric machine ( 1 ) powered with square wave voltage by a power converter ( 2 ), for the purpose of assessing for diagnostic purposes the activity of partial discharges taking place in the machine ( 1 ), said data comprising a plurality of discharge signals associated with said partial electrical discharges and a plurality of sets of three values (e U , e V , e W ) of power supply voltage of the machine ( 1 ), each set measured in concurrence with a corresponding discharge signal, wherein said method comprises the following steps: transforming each set (e U , e V , e W ) of three voltage values measured into a corresponding pair (e d , e q ) of voltage values; deriving a phase angle value from each of said pairs (e d , e q ) of voltage values, the derived phase angle values being in relation to logic states of the converter ( 2 ); attributing to each discharge signal associated with a corresponding partial electrical discharge the corresponding phase angle value, to assess the measured discharge signals as a function of corresponding phase angle values.