Prebreakdown and Breakdown Behavior of Low Pour Point Dielectric Liquids Under Negative Lightning Impulse Voltage

Jayasree, T.; Rózga, Paweł; Fofana, I.; Rao, U. Mohan; Brettschneider, S.; Picher, P.; Celis, E. M. Rodriguez

doi:10.1109/tdei.2023.3274731

Cited by 4 publications

(2 citation statements)

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“…However, the influence of polarity on the streamer propagation velocities is also a subject of research for a few studies [19,20]. Due to various reasons reported in the previous section and author's recent articles [5,6,15], the low pour point ester liquids have been the target test liquids. It is to be understood that these prebreakdown phenomena and breakdown behaviour under impulse conditions are not yet explored.…”

Section: Lightning Impulse Polarity: Backgroundmentioning

confidence: 99%

“…It is noticed that the chemical changes incurred due to degradation, acidity, and concentration of decay products directly impact the streamer behaviour and this phenomenon in low pour point synthetic ester liquids is comparable to mineral oils. Recently, the prebreakdown phenomena of low pourpoint synthetic ester liquids (aged and non-aged) via-a-vis mineral oils and typical synthetic esters have been analysed under negative lightning impulses for the case of a point-plane electrode with medium gap [15]. From the study, it is observed that the streamer inception and breakdown voltages of low pour point esters are similar to mineral oil.…”

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confidence: 99%

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Analysis of Breakdown Voltage of Low Pour Point Synthetic Ester Insulating Liquids Under Lightning Impulse Voltage of Both Polarities

Jayasree,

Fofana,

Rozga

et al. 2024

IEEE Trans. Dielect. Electr. Insul.

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In this article, lightning impulse breakdown behaviour of two low pour point synthetic ester liquids is presented in comparison to a typical synthetic ester at both positive and negative polarities. Traditional mineral insulating oil has been also considered for reference purposes. A detailed breakdown behaviour analysis of the four test liquids under a non-uniform field (medium gap, point-plane electrode system) and quasi-uniform field (smaller gap, U-plane electrode system) is envisaged. The lightning impulse breakdown measurements based on the source voltage waveforms and light activity during the discharge process are presented. The Weibull breakdown failure rates and streamer velocity during the breakdown of different liquids for all the cases (+/-polarities and both electrode configurations) are reported in support of the discussions. In the case of non-uniform fields, the lightning breakdown voltage of the low pour point liquids is found to be higher than typical synthetic esters and is comparable to mineral oil under both polarities. While in the case of quasiuniform field, the lightning breakdown voltage of the low pour point liquids is found to be lower than mineral oil and comparable to the typical synthetic ester under both polarities. These findings add to limited knowledge on the application of esters in cold countries and allow insulation designers to estimate the behaviour of the low pour point synthetic ester liquids under lightning conditions.

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