| 摘要 |
PROBLEM TO BE SOLVED: To accurately measure an AC power supplied through an electric wire to which an AC voltage of a known voltage value is applied.SOLUTION: A power measurement device includes a voltage detection part 2 detecting an AC voltage Vt applied to a core wire 101 in a non-contact state, to output the AC voltage Vt as a voltage detection signal Sv, a current detection part 3 detecting an AC current It flowing in the core wire 101 in the non-contact state, to output a current detection signal Si, and a processing part 22 measuring an AC power P supplied through the core wire 101 based on the voltage detection signal Sv and the current detection signal Si. The processing part 22 executes phase difference detection processing for detecting a phase difference &phgr; between the voltage detection signal Sv and the current detection signal Si, current effective value calculation processing for calculating the current effective value Irms of the AC current It based on the current detection signal Si, and power measurement processing for measuring the AC power P based on the voltage effective value Vrms of the AC voltage Vt inputted by input operation, the calculated current effective value Irms, and the detected phase difference &phgr;. |
