Prebreakdown and Breakdown Phenomena in Ester Dielectric Liquids

Rózga, Paweł; Jayasree, T.; Rao, U. Mohan; Fofana, I.; Picher, P.

doi:10.1002/9781119800194.ch6

Cited by 3 publications

(10 citation statements)

References 74 publications

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“…This indicates the stability of the electric field in the case of synthetic ester liquids (SE1, SE2, and TSE) under non-uniform electric field conditions. This observation is in line with the existing literature on mineral oil and typical synthetic ester liquids [7,14,20]. The registry of the light activity indicates a higher light intensity, and probably more dense streamers (could be main or branching) are witnessed in the case of the low pour point liquids.…”

Section: • Point Plane Electrodesupporting

confidence: 91%

“…It is observed that the low pour point synthetic ester liquids (SE1 and SE2) have a 10 to 12% higher LIBDV than that of the typical synthetic ester and have comparable values to that of the mineral oil. While the typical synthetic ester has a lesser LIBV than that of the MO (almost 14% higher than TSE), which is in line with the previous literature [7,14,20]. In the case of time to breakdown values, it is observed that the SE1 and SE2 have only slightly less time to breakdown than in case of mineral oil.…”

Section: • Point Plane Electrodesupporting

confidence: 90%

“…To date, the research on the prebreakdown and breakdown of insulating liquids under lightning impulses is generally focused on the negative polarity, summarised in [7,14]. However, the influence of polarity on the streamer propagation velocities is also a subject of research for a few studies [19,20].…”

Section: Lightning Impulse Polarity: Backgroundmentioning

confidence: 99%

“…The optical parameters deal with the properties of light realised during the streamer propagation, generally recorded using a photomultiplier tube or analyzed using spectral approaches. There is abundant literature, reviewed in [7,14], on the understanding of the dielectric behaviour of the ester based dielectric liquids (both natural and synthetic). The literature and existing standards are focused on comparing the behaviour of streamers in esters to that of streamers in mineral oils.…”

mentioning

confidence: 99%

“…However, it is also reported that the cold climatic conditions favor the occurrence of positive polarity impulses. It is known that the positive polarity impulses are rigorous in nature and leave a detrimental impact on the insulation system compared to that of the negative type [7,14]. Henceforth, there is high importance for studies dealing with positive polarity, especially for insulation systems designed for cold climatic conditions.…”

mentioning

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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Section: • Point Plane Electrodesupporting

confidence: 91%

Section: • Point Plane Electrodesupporting

confidence: 90%

Section: Lightning Impulse Polarity: Backgroundmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

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

Jayasree

Rózga

Fofana

et al. 2023

IEEE Trans. Dielect. Electr. Insul.

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Archives of Electrical Engineering

Dang

Béroual

Rózga

2022

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This article deals with the analysis of the fractal dimension of streamers propagating in mineral oil, under lightning impulse voltage, using the box counting method; the method and technique of calculation are described therein. In the considered experimental conditions, the average velocities of recorded streamers are of 2.4 km/s and 1.8 km/s for positive and negative streamers, respectively; these velocities correspond to the 2 nd mode of streamers propagation. It is shown that the streamers present the fractal dimension 𝐷; and the higher 𝐷 is the bushier are the streamers (i.e. with high branch density). The positive streamers can have higher 𝐷 than the negative ones, if they are bushier.

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Prebreakdown and Breakdown Phenomena in Ester Dielectric Liquids

Cited by 3 publications

References 74 publications

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

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

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

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