Impact of power quality sensor technique on power system protection voltage transient measurements

Abstract

With the increasing connections of generation using power electronics and transmission network capacity using embedded FACTS devices, the measurement of higher than 50th voltage harmonics is of growing importance. This paper presents how to use the recent proposed Power Quality Sensor (PQ Sensor) adding onto the existing Capacitor Voltage Transformer (CVT) infrastructure to measure high orders of voltage harmonics and voltage transients accurately. A CVT circuit with the PQ sensor was modelled and simulated. The PQ Sensor performances were evaluated and tested under various CVT burden conditions. The results show that the PQ sensor has excellent linear frequency response, in terms of magnitude and phase, over the studied frequency range from 10 Hz to 10 kHz. The sensitivity studies show that the PQSensor frequency response performances are only affected the change of the capacitors of the CVT, and not the burden of the CVT. (4 pages)