Time reference compensation for improved metering accuracy

A system for time reference compensation in a power metering system, the system comprising:

• means for counting cycles of incoming AC power over a predetermined local time interval;
• means for comparing the number of cycles counted over said predetermined local time interval with the number of cycles expected;
• and
• means responsive to said means for comparing for calculating a correction to one or more local real-time and time-based measurements of said power metering system, said correction being a specific time of day that includes at least one of a specific date correction and a specific time correction.

A method for time reference compensation in a power metering system, the method of comprising:

• monitoring cycles of incoming AC power over a predetermined local time interval;
• determining a cumulative phase shift of the power line frequency over said predetermined local time interval;
• and
• calculating a correction to one or more of local real-time and time-based measurements of said power metering system, based on a comparison of said cumulative phase shift slip over said predetermined local time interval with the phase shift for a true time interval at the nominal frequency of said AC power, said correction being a specific time of day that includes at least one of a specific date correction and a specific time correction.

A system for time reference compensation in a power metering system, means for the system comprising:

• means for monitoring cycles of incoming AC power over a predetermined local time interval;
• means for determining a cumulative phase shift of the power line frequency over said predetermined local time interval;
• and
• means for calculating a correction to one or more of local real-time and time-based measurements of said power metering system, based on a comparison of said cumulative phase shift slip over said predetermined local time interval with the phase shift for a true time interval at the nominal frequency of said AC power, said correction being a specific time of day that includes at least one of a specific date correction and a specific time correction.

A method for time reference compensation in a power metering system, the method comprising:

• monitoring a time-dependent characteristic of incoming AC power over a predetermined local time interval;
• comparing the monitored characteristic over said predetermined local time interval with the expected value of said characteristic based upon the nominal frequency of said AC power;
• and
• calculating a correction to one or more of local real-time and time-based measurements of said power metering system, based on said comparing, said correction being a specific time of day that includes at least one of a specific date correction and a specific time correction.

A system for time reference compensation in a power metering system, the system comprising:

• means for monitoring a time-dependent characteristic of incoming AC power over a predetermined local time interval;
• means for comparing the monitored characteristic over said predetermined local time interval with the expected value of said characteristic based upon the nominal frequency of said AC power;
• and
• means for calculating a correction to one or more of local real-time and time-based measurements of said power metering system, based on said comparing, said correction being a specific time of day that includes at least one of a specific date correction and a specific time correction.