초록 ▼

An apparatus and method for measuring electrical energy and quadergy and for performing line frequency compensation includes a compensation integrated circuit for adjusting the determined reactive load quadergy, based on variations between the actual line frequency and the rated line frequency of th

An apparatus and method for measuring electrical energy and quadergy and for performing line frequency compensation includes a compensation integrated circuit for adjusting the determined reactive load quadergy, based on variations between the actual line frequency and the rated line frequency of the meter. Reactive load quadergy is determined by phase-shifting the line voltage by a fixed time interval, based on the rated line frequency of the meter. The determined reactive load quadergy is adjusted to compensate for variations in line frequency. Because the determined reactive load quadergy is output by an electric meter as a continuous pulse train, adjustment to the determined reactive load quadergy is performed by adding or subtracting state changes from the pulse train and then registering the adjusted reactive load quadergy.

대표청구항 ▼

A meter for measuring electrical energy, comprising: means for sensing a line voltage, a load current and a line frequency, during an energy measurement time interval; means, electrically connected to said sensing means, for determining real load energy from the sensed line voltage and the sensed lo

A meter for measuring electrical energy, comprising: means for sensing a line voltage, a load current and a line frequency, during an energy measurement time interval; means, electrically connected to said sensing means, for determining real load energy from the sensed line voltage and the sensed load current, during the energy measurement time interval; means, electrically connected to said sensing means, for determining reactive load quadergy from the sensed line voltage and the sensed load current, during the energy measurement time interval; and compensation means, connected to said real load energy determining means and said reactive load quadergy determining means, for adjusting the determined reactive load quadergy, based upon deviations between the sensed line frequency and a rated line frequency.