Capacitance-coupled voltage transformer monitoring

A system to monitor the health of a capacitance-coupled voltage transformer (CCVT) of an electric power delivery system, comprising:

• a CCVT in electrical communication with the electric power delivery system, the CCVT comprising a stack of capacitors and an electrical contact to a first ground connection;
• a first transformer disposed between the stack of capacitors and the first ground connection, the first transformer to provide a first current signal corresponding to a first current flowing through the CCVT;
• a second transformer disposed on the CCVT to provide a second electrical signal corresponding to the CCVT;
• an intelligent electronic device (IED) in electrical communication with the first transformer and the second transformer, to:
• receive the first current signal from the first transformer;
• receive the second electrical signal from the second transformer;
• calculate a health factor for a common frequency from the first current signal and the second signal;
• compare the health factor against a health range;
• and
• when the health factor exceeds the health range, signal an alarm.