Partial discharge study in transformer oil due to particle movement under DC voltage using the UHF technique

R. Sarathi, Alistair Reid, Martin D. Judd

    Research output: Contribution to journalArticle


    Converter transformers are one of the key components in high voltage DC power networks. The insulation of these transformers is stressed by both AC and DC voltages. Therefore, AC and DC voltage tests are routinely applied during factory tests to verify the performance of the insulation structure. Partial discharges in an insulation system are incipient discharges that can damage materials and may eventually lead to complete failure of the insulation system during operation. Recently it has been shown that monitoring such discharges formed under AC stress is feasible using Ultra High Frequency (UHF) measurement technique and that there is a reasonable correlation between the partial discharge magnitude and the amplitude of the UHF signal generated by partial discharges.
    Original languageEnglish
    Pages (from-to)1819–1825
    Number of pages7
    JournalElectric Power Systems Research
    Issue number11
    Publication statusPublished - Nov 2008



    • high voltage
    • converter transformers
    • insulating oil
    • power systems

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