System and method for synchronous machine health monitoring

摘要

A method, system and computer program product for monitoring health of a synchronous machine is provided. The method includes receiving a plurality of phase voltage values and a plurality of phase current values. The method then computes a negative sequence voltage (Vn) based on the plurality of phase voltage values. The method also computes one or more operating parameters based on at least one of the plurality of phase voltage values and the plurality of phase current values. The method retrieves from a data store, one or more known Vn based on the one or more operating parameters. The method then computes a machine health indicator based on the computed Vn and the one or more known Vn, and raises an alarm based on the machine health indicator.

主权项

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:
computing a phasor difference between the healthy state Vn and the computed Vn; andnormalizing the phasor difference with respect to the healthy open circuit Vn; and 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.