Meter Any Wire, Anywhere by Virtualizing the Voltage Channel
AC power meters require both voltage and current to be sampled concurrently to obtain real, reactive, and apparent power. Typically, the two measurements are taken in close physical proximity and fed into a single power metering device. In this paper, the authors explore the viability of decoupling the voltage and current channels, and placing them in physically disparate locations. Such decoupling could ease the installation of metering infrastructure and enable new sensing scenarios. However, decoupling the voltage and current channels raises a new question: how should they be recombined? Of the various approaches, they propose the voltage channel be virtualized: a voltage sensor measures the voltage magnitude, frequency, and phase, typically near the root of a circuit branch.