A method for determining the sign of the smaller: Wattmeter reading in balanced three-phase power measurements

@article{HumphreyAMF,
  title={A method for determining the sign of the smaller: Wattmeter reading in balanced three-phase power measurements},
  author={Herbert Kay Humphrey},
  journal={Journal of the A.I.E.E.},
  volume={45},
  pages={430-431}
}
WHEN three-phase (three-wire) power is measured by the two-wattmeter method, the smaller reading may be either positive or negative, so that the total power, which is the sum of the two wattmeter readings, may be obtained by adding the smaller reading to the larger in one case, and by subtracting it in another case. On balanced load this reading is positive… CONTINUE READING