Temperature compensation of insulation monitoring for rotating machines

A method, comprising:

• deriving, via a monitoring and/or protection system comprising an insulation derivation circuit, an original current measurement based on a signal from a current sensor sensing a current traversing a stator winding of a motor, a generator, or a combination thereof by comparing a phase of the current sensed by the current sensor with a phase of a voltage associated with the current and sensed via a line voltage sensor;
• deriving, via the monitoring and/or protection system, an original temperature measurement based on a temperature signal from a temperature sensor disposed in a stator comprising the stator winding and configured to sense a temperature when the stator is energized;
• and
• deriving, via the monitoring and/or protection system, an original insulation condition based on the original current measurement and the original temperature measurement.

A system, comprising:

• a current sensor configured to sense a current traversing a stator winding of a motor, a generator, or a combination thereof;
• a temperature sensor disposed in a stator comprising the stator winding and configured to sense a temperature when the stator is energized;
• and
• an insulation derivation circuit comprising a processor communicatively coupled to the current sensor and the temperature sensor, and wherein the processor is configured to:
• derive an original current measurement based on a signal from the current sensor by comparing a phase of the current sensed by the current sensor with a phase of a voltage associated with the current and sensed via a line voltage sensor;
• derive an original temperature measurement based on a temperature signal from the temperature sensor;
• and
• derive an original insulation condition of an insulation of the stator winding based on the original current measurement and the original temperature measurement.