Line fault signature analysis

A device comprising:

• a set of inputs to receive a monitor signal having a fundamental frequency;
• a first analyzer coupled to the set of inputs and configured to provide a count of events in the monitor signal having a respective frequency greater than the fundamental frequency;
• a second analyzer coupled to the set of inputs and configured to provide frequency data of the monitor signal;
• and
• a fault detector coupled to the first analyzer and the second analyzer and configured to:
• wake in response to the count of events exceeding a threshold;
• and
• upon waking, assert a flag in response to the count of events and the frequency data.

A method comprising:

• receiving a sensor signal having a fundamental frequency;
• determining a count of events in the sensor signal having a frequency greater than the fundamental frequency;
• determining frequency band information representing energy in each of a set of frequency bands;
• generating a flag in response to the count of events and the frequency band information.