Accurate Voltage Measurement with Electric Field Sampling Using Permittivity Shielding

This paper introduces permittivity shielding. Permittivity shielding enables the measurement of voltage with very few electric field sensors. Voltage sensor designs using permittivity shielding can exploit existing optical sensor technology without the need for the expensive and potentially hazardous insulation found in many modem optical voltage transducers. Numerical simulations demonstrate that a voltage sensor consisting of 100 M shielding and six electric field sensors, or less, mounted inside an "off-the-shelf" stand-off insulator can achieve Class 1 metering accuracies (0.3 % magnitude error and 8 min phase error) even in the presence of strong stray field effects.