Breakdown Characteristics of a Transformer Oil in Moderately-Uniform Fields under Lightning Impulse

Yu, Haichuan; Liu, Qiang; Wang, Zhongdong; Wilkinson, Mark; Krause, Christoph; Györe, Attila; Hilker, Andree

doi:10.1109/icdl49583.2022.9830952

Cited by 3 publications

(3 citation statements)

References 10 publications

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“…As for MOs, the deduced positive TFFB‐Mechanisms are 53.0 from [22] and 59.5 from [14]. In [14], it was also reported that the extrapolated negative TFFB‐Mechanisms of MO are in the range of 5.7–14.8, which was then experimentally verified in [43] with the reported negative TFFB‐Mechanism of 9.6.…”

Section: Effect Of Field Uniformity On Breakdown Mechanismsmentioning

confidence: 66%

“…Similar performance is also observed under negative polarity. The negative TFFB‐Mechanism of MO is extrapolated and verified in the range of 5.7–14.8 or 7.9–14.0 based on different methods [14, 43]. The negative TFFB‐Liquid of 14 from the fitted curve as shown in Figure 10 is just within the extrapolated range.…”

Section: Discussionmentioning

confidence: 84%

“…Another method is proposed in [14] via the maximum electric field at the breakdown voltage against the field factor. It has been found that the TFFB-Mechanism in natural esters is about 50 under positive lightning impulse [14], whilst the negative TFFB-Mechanism has been deduced to be lower than the positive one [14,43]. As for MOs, the deduced positive TFFB-Mechanisms are 53.0 from [22] and 59.5 from [14].…”

Section: Effect Of Field Uniformity On Breakdown Mechanismsmentioning

confidence: 99%

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Statistical analysis and interpretation on lightning impulse breakdown voltages of ester liquids under varying field uniformity

Yu,

Liu,

Wang

2023

High Voltage

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Ester liquids (ELs), as the alternative transformer liquids to the conventional mineral oils (MOs), have been increasingly used in power transformers with high voltage ratings. Among various properties, the lightning impulse breakdown voltages (LIBDVs) have been studied elaborately in the past 2 decades under different electric field uniformities. The electric field uniformities do have an effect on the breakdown characteristics, for example, breakdown mechanisms, polarity effects, and differences of LIBDV between ELs and MOs, which is quantitatively investigated based on the LIBDVs collected from the literatures. The breakdown mechanism transition phenomenon between streamer initiation dominated breakdown and streamer propagation dominated breakdown has been reviewed firstly. Then, the transition field factor boundaries to observe the polarity effect on LIBDVs are taken at around 20 for ELs and 10 for MOs. Besides, the transition field factor boundaries to observe the LIBDV distinctions between ELs and MOs are about 109 and 14 under positive and negative lightning impulse, respectively. The systematic analysis and interpretation on the transition field factor boundaries among different phenomena can provide insights on insulation design of ELs filled power transformers.

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Section: Effect Of Field Uniformity On Breakdown Mechanismsmentioning

confidence: 66%

Section: Discussionmentioning

confidence: 84%