Systems and methods for determining rotor deterioration in a dynamoelectric machine

A method comprising:

• providing a dynamoelectric machine comprising a field winding and an exciter assembly, the exciter assembly comprising a slip ring for providing direct current (DC) power to the field winding;
• generating a resistance values log that includes resistance values measured between the slip ring and the field winding at various intervals when the dynamoelectric machine is in operation;
• using at least a portion of the resistance values log to generate a spectral signature of a rotor resistance measurement that is carried out when the dynamoelectric machine is subjected to a slow-roll mode of operation;
• determining a level of alteration in rotor resistance based at least in part, on evaluating one or more harmonic components when present in the spectral signature;
• determining at least one of an altered rotor resistance condition of the dynamoelectric machine during the slow-roll mode of operation, or a rotor resistance alteration trend of the dynamoelectric machine, based at least in part, on processing the level of alteration in rotor resistance;
• and
• carrying out at least one of a repair procedure or a maintenance procedure upon one or more components of the dynamoelectric machine based on the at least one of the altered rotor resistance condition or the rotor resistance alteration trend.

A non-transitory computer-readable storage medium having stored thereon, instructions executable by a computer for performing operations comprising:

• generating a resistance values log that includes resistance values measured between a slip ring and a field winding of a dynamoelectric machine at various intervals when the dynamoelectric machine is in operation;
• using at least a portion of the resistance values log to generate a spectral signature of a resistance measurement that is carried out when the dynamoelectric machine is subjected to a slow-roll mode of operation;
• determining a level of alteration in rotor resistance based at least in part, on evaluating one or more harmonic components when present in the spectral signature;
• determining at least one of an altered rotor resistance condition of the dynamoelectric machine during the slow-roll mode of operation, or a rotor resistance alteration trend of the dynamoelectric machine, based at least in part, on processing the level of alteration in rotor resistance;
• and
• displaying on a display of a graphical user interface, the at least one of the altered rotor resistance condition or the rotor resistance alteration trend.