| 摘要 |
<P>PROBLEM TO BE SOLVED: To easily measure electric power, without stopping a cable way or load whose electric power is intended to be measured. <P>SOLUTION: An electric power measuring device attaches voltage input probes P1 and P2 for setting to a voltage input circuit 21 for setting, and fetches the voltage of a cable way to be measured. The voltage fetched is input into a phase constant-voltage constant arithmetic circuit 22, and the phase difference and voltage ratio are determined. The determined phase difference and voltage ratio are stored as a phase constant and a voltage constant in a phase constant-voltage constant storage circuit 23. Regarding two stored constants, a cable way (CT number) setting function circuit 24 sets the cable way from which the voltage is fetched for each object whose power is to be measured, and control power supply voltage and an output of the storage circuit are input into a line voltage arithmetic circuit 25. The arithmetic result by the arithmetic circuit 25 is input into an electric power arithmetic circuit 26, and the electric power is calculated. <P>COPYRIGHT: (C)2009,JPO&INPIT |
