Effect of Harmonics on Pulse Sequence Analysis Plots from Electrical Trees

N.H. Aziz, V.M. Catterson, S. M. Rowland, S. Bahadoorsingh

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

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    This paper investigates the effect of harmonic pollution on the Pulse Sequence Analysis (PSA) pattern. Partial discharge data was captured from electrical trees growing in epoxy resin in the presence of different harmonic regimes. These regimes included 50Hz waveforms polluted with 3rd, 5th, 7th, 11th, 13th, 23rd and 25th order harmonics, at varying levels of Total Harmonic Distortion (THD) and waveshape factor (KS). In this paper, the data has been analyzed using PSA by plotting the external voltage of consecutive PD pulses (un vs un-1). Under pure 50 Hz conditions, four clusters of data points can be identified in the plot and the formation of the clusters is discussed. Further investigation was performed by running the samples to breakdown. The results show that even in the presence of harmonics, an increase of PD occurrence and phase distribution translates into the expected PSA pattern, where clusters of data points merge to form a 45 straight line. Therefore, PSA is relatively immune to the effects of harmonic distortion when considering it only as an indicator of breakdown.
    Original languageEnglish
    Title of host publicationhost publication
    Number of pages4
    Publication statusPublished - 2014
    EventConference on Electrical Insulation and Dielectric Phenomena (CEIDP) - Des Moines
    Duration: 1 Jan 1824 → …


    ConferenceConference on Electrical Insulation and Dielectric Phenomena (CEIDP)
    CityDes Moines
    Period1/01/24 → …


    • Pulse Sequence Analysis, PSA, Partial discharge, PD, electrical trees,Total Harmonic Distortion, THD, waveshape factor, breakdown


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