Abstract
<p>The paper presents results of an experimental study of two methods of voltage dip tracking. The first is based on half cycle absolute<br />peak value monitoring, whereas the second is based on low-pass filtration of squares of voltage samples. Both methods are devised<br />for application in low-cost integrated circuits, dedicated to power quality monitoring. The two real voltage dips have been considered<br />for the aim. The results are compared with the reference method recommended in IEC Std. 61000-4-30, based on calculation of the<br />r.m.s. voltage refreshed each half cycle. Further, the application of the low-pass method for assessment small voltage variations is<br />considered, both short term (r.m.s. voltage refreshed each half cycle) and long term (r.m.s. voltage calculated over 10 cycles of voltage<br />fundamental component). The research confirmed sufficient accuracy of the method based on low-pass filtering for the class A of<br />measurement.</p>
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