System and method for synchronous machine health monitoring

A system for synchronous machine health monitoring comprising:

• a data receiver for receiving a plurality of phase voltage values and a plurality of phase current values;
• a sequence component module for computing a negative sequence voltage (Vn) based on the plurality of phase voltage values, wherein the Vn is representative of a negative sequence back electromotive force (EMF) which represents a signature of a winding fault in a corresponding configuration of a synchronous machine;
• a lookup module for retrieving from a data store, one or more known Vn based on at least one of the plurality of phase voltage values and the plurality of phase current values;
• an prognostic module for computing a plurality of voltage phasors based on the plurality of phase voltage values and computing a machine health indicator based on the computed Vn and the one or more known Vn, wherein the one or more known Vn may be scaled according to a measured speed of the synchronous machine and wherein computing the machine health indicator comprises computing a phasor difference between the healthy state Vn and the computed Vn;
• and normalizing the phasor difference with respect to the healthy open circuit Vn;
• and
• an alarm module for raising an alarm based on the machine health indicator;
• wherein the alarm module is configured to compare a computed value of the machine health indicator with a healthy state value of the machine health indicator.

A computer program product comprising a non-transitory computer readable medium encoded with computer-executable instructions for monitoring health of a synchronous machine, wherein the computer executable instructions, when executed, cause one or more processors:

• receive a plurality of phase voltage values and a plurality of phase current values;
• compute a plurality of voltage phasors based on the plurality of phase voltage values;
• compute a negative sequence voltage (Vn) based on the plurality of phase voltage values, wherein the Vn is representative of a negative sequence back electromotive force (EMF) which represents a signature of a winding fault in a corresponding configuration of a synchronous machine;
• compute one or more operating parameters based on at least one of the plurality of phase voltage values and the plurality of phase current values;
• retrieve from a lookup data store, one or more known Vn based on the one or more operating parameters;
• compute a machine health indicator based on the computed Vn and the one or more known Vn, wherein the one or more known Vn may be scaled according to a measured speed of the synchronous machine;
• compute a phasor difference between the healthy state Vn and the computed Vn;
• and
• normalize the phasor difference with respect to the open circuit Vn;
• and
• raise an alarm based on the machine health indicator, wherein the alarm is raised further based on a comparison of a computed value of the machine health indicator with a healthy state value of the machine health indicator.