| 摘要 |
PCT No. PCT/US92/06439 Sec. 371 Date Dec. 21, 1994 Sec. 102(e) Date Dec. 21, 1994 PCT Filed Aug. 3, 1992 PCT Pub. No. WO94/03818 PCT Pub. Date Feb. 17, 1994A method and apparatus for rapidly and continuously sampling AC voltage and current signals in a power system. The sampled signals are then analyzed in a sine board computer to derive a number of fundamental electrical variables. These variables include frequency, RMS volts, RMS amps and a phase angular relationship between the voltage and currents in the system. The computer also performs calibration and compensation functions. From these fundamental variable, other useful parameters can be calculated such as watts, watt-hours, VARS, and power factor. |
