| 摘要 |
PROBLEM TO BE SOLVED: To make both integrations compatible with each other by use of a single power integrating device, by obtaining power by the use of power computing means from an A/D converted voltage and current so that one of the integrating means continuously obtains watthours while the other one of the integrating means obtains watthours only during a specified period in accordance with opening and closing of a gate. SOLUTION: A supply power from a power line L is fed to a transformer circuit 1 in a power integrating device PM through a transformer PCTC, and is voltage- and current-converted in addition to insulation. A computing means 2 A/D-converts the voltage and the current so as to obtain a momentary power value. An integrating means 51 successively integrates such momentary power, and stores the watthours in a memory 54. An integrating means 53 obtains watthours only during a period during which a gate means 52 opens when a contact signal is turned on, are stores the same in the memory 54. Both the watthours are delivered to a operating and displaying means 7 which can display both the watthous simultaneously or alternately. With this arrangement, continuous watthous and integrated watthous during a specified period can both be calculated only by one device. |
