Patent ID: 8803461
Filing Date: 2014-08-12
Classification: G01R,H02P

Abstract:
1. A method for synchronous machine health monitoring comprising: receiving a plurality of phase voltage values and a plurality of phase current values; computing a plurality of voltage phasors based on the plurality of phase voltage values; 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; computing one or more operating parameters based on at least one of the plurality of phase voltage values and the plurality of phase current values; retrieving from a lookup data store, one or more known Vn based on the one or more operating parameters; 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, wherein computing the machine health indicator comprises: raising an alarm based on the machine health indicator, wherein the raising an alarm based on the machine health indicator comprises comparing a computed value of the machine health indicator with a healthy state value of the machine health indicator.