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 permittivityshielding can exploit existing optical sensor technology without the need for the expensive and potentially hazardous insulation found in many modern optical voltage transducers (OVTs). 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 IEC 60044-2 0.2 metering class accuracies ( 0 2%magnitude error and 10 minutes phase error) even in the presence of strong stray field effects.