Modified quadrature method for accurate voltage measurement in optical voltage transducer

Abstract

There are fewer problems encountered with optical voltage transducers in comparison with their inductive and capacitive counterparts. As a result they are considered as proper candidates for replacing conventional inductive and capacitive transformers. Lighter weight, smaller size, larger dynamic range, wider bandwidth, insensitivity to electromagnetic interference, stability over temperature change, absence of iron core saturation, low maintenance and replacement cost, are some of the advantages of optical voltage transducers over inductive and capacitive transformers. A modified quadrature method is introduced to measure the voltage with the minimum number of sensors. Another advantage of this method is the possibility of improving the accuracy of the measurement by using a correction factor. The correction factor is determined by considering the level of accuracy, environmental conditions and the number of sensors. Simulation results show the validity and effectiveness of this method over a wide range of variation.