Experimental comparison of MV voltage transducers for power quality applications

Abstract

The paper presents a measurement campaign to compare the behavior of voltage transducers suitable for medium voltage (MV) networks in the measurement of power quality (PQ) parameters. In particular, high bandwidth resistive-capacitive dividers are compared to traditional magnetic core instrument transformers. Firstly, the main specifications of the compared transducers are recalled and the experimental setup used to perform the measurements is shown. Then, the results of laboratory characterization tests, performed with medium voltage signals, are presented, with the main purpose of comparing the harmonic behavior of the different kinds of transducers. Finally, the results of in-field measurements, performed in a node of a three phase MV network, are presented and discussed. These results are expected to provide useful indications about the accuracy achievable in the measurement of some important PQ parameters, such as the ones related to harmonics and transients, as well as in the measurement of harmonic synchrophasors.