Simple, fast detector for voltage dip or voltage swell

K. M. Tsang, Wai Lok Chan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

6 Citations (Scopus)


A simple, fast detection scheme for voltage dip and voltage swell is presented. Applying a simple relay and lowpass filter to the supply voltage signal, an in-phase fixed magnitude reference signal with very low total harmonic distortion can be generated. Comparing the supply signal with the in-phased fixed magnitude reference sinusoid, any change of magnitude in the supply signal can be detected. The detection scheme can indicate voltage dip and voltage swell in less than a quarter of the cycle of oscillation. Experimental results are presented to demonstrate the effectiveness of the proposed detection scheme.
Original languageEnglish
Pages (from-to)245-247
Number of pages3
JournalElectronics Letters
Issue number4
Publication statusPublished - 26 Feb 2007

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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