PURPOSE:To rationalize consumed power, by providing an operation circuit outputting a pulse wherein a power adaptive price section is calculated, a power charge counter counting the pulse and a power charge display part displaying a power charge as the count value of the counter. CONSTITUTION:The power fed to each power user by a distribution line 2 has frequency divided into a plurality of ranks. An effective power charge meter 4 discriminates plural ranks of power source frequencies and multiplies consumed electric energy by the multiplying factors of plural ranks to output and display a consumed electric power charge. A power adaptive price section discriminating circuit 11 discriminates the frequency of inputted power. For example, the multiplying factor alpha2 at the time of a discrimination signal F2 corresponds to a middle class power charge rank and consumed power at this time is calculated on the basis of the middle class power charge rank and the calculated value is counted hourly by a counter 13. When total power demand quantity exceeds a predetermined value, a discrimination signal changes from F2 to F3 and consumed power is calculated on the basis of the max. power charge rank of the multiplying factor alpha3 corresponding to the signal F3. The count value of the power rate counter 13 is displayed on a power charge display part 14.
展开▼
