Lightning properties of selected insulating synthetic esters and mineral oil in point-to-sphere electrode system

Rózga, Paweł; Stanek, Marcin; Rapp, Kevin

doi:10.1109/tdei.2018.007069

Cited by 29 publications

(38 citation statements)

References 20 publications

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“…Although the BDV characterization would be more precise if a higher number of breakdowns were recorded, most of the previous works in the field of NDF base their results in five and even less breakdowns (i.e [7] and [16] [14]. In this work the ten ruptures used to obtain the BDV value at each polarity were measured on the same sample.…”

Section: Impulse Breakdown Voltage Testsmentioning

confidence: 99%

“…An example of one of the applied impulses is shown in Figure 3 including the main measured parameters (i.e the impulse BDV and the time to breakdown). [14]. In this work the ten ruptures used to obtain the BDV value at each polarity were measured on the same sample.…”

Section: Impulse Breakdown Voltage Testsmentioning

confidence: 99%

“…According to the ASTM D3300 standard [12] and IEC 60897 [13], streamer propagation is generally measured using a standard lightning impulse voltage 1.2/50 µs in a needle-sphere combination of electrodes with a 25 mm gap. Some studies have maintained this needle-sphere combination of electrodes as [1,[14][15][16] although some other authors used other electrode configurations in their studies such as needle-plane electrodes [17] or sphere-sphere as [18]. The speed of streamer propagation in dielectric liquids is strongly dependent on the polarity of the applied voltage and its peak amplitude [14,19,20].…”

Section: Introductionmentioning

confidence: 99%

“…Some studies have maintained this needle-sphere combination of electrodes as [1,[14][15][16] although some other authors used other electrode configurations in their studies such as needle-plane electrodes [17] or sphere-sphere as [18]. The speed of streamer propagation in dielectric liquids is strongly dependent on the polarity of the applied voltage and its peak amplitude [14,19,20]. In the particular case of MO, it has been proved that the streamers originated on a positive electrode tend to initiate at lower voltages than those originated on a negative electrode, and propagate faster and further [21] supposing a higher risk for the transformer insulation.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of the Lightning Impulse Breakdown Voltage of Mineral Oil based Fe3O4 Nanofluids

et al. 2019

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The recent interest in the development of nanomaterials has led researchers to the study of their electrical properties and the applications that they may have as insulating materials. One of these applications is the use of nanofluids as electrical insulation of power transformers. It has been reported that the dielectric properties of insulating liquids in which small amounts of nanoparticles have been dispersed are, in some cases, superior to those of the base fluids. Although these materials are promising, and their application could lead to advantages for the transformer design and reliability in the future, more research is necessary to evaluate different combination of materials under a wider range of experimental conditions. In this paper, a research on the lightning impulse breakdown voltage of mineral oil and several Fe3O4-based nanofluids is presented. Fluids prepared with different concentrations of nanoparticles were subjected to impulse lightning voltages considering both positive and negative polarities. As shown in this work the positive impulse breakdown voltage of the liquids showed improvements of up to 50%; in the case of the negative impulses not significant improvements were obtained.

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Section: Impulse Breakdown Voltage Testsmentioning

confidence: 99%

Section: Impulse Breakdown Voltage Testsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Investigation of the Lightning Impulse Breakdown Voltage of Mineral Oil based Fe3O4 Nanofluids

et al. 2019

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“…The above aspects have been the subject of research for those interested in alternative liquid dielectrics. Several researchers reported the potential of ester dielectric fluids as a possible alternative to mineral oil [2][3][4]. However, there is still a great scope for research on understanding the compatibility of these new insulating fluids with transformer operating conditions.…”

mentioning

confidence: 99%

Influence of Aging on Oil Degradation and Gassing Tendency for Mineral oil and Synthetic Ester under Low Energy Discharge Electrical Faults

2020

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The intent of this work is to understand the influence of low energy discharge electric faults in mineral oil and synthetic esters on liquid degradation and gassing tendency at different aging conditions (based on acidity values). A low energy discharge electric fault has been created by continuous discharge of 9 kV for five hours on the liquid surface using a suitable laboratory setup. Liquid degradation is reported by adopting UV spectroscopy, turbidity, and particle counter measurements. The gassing tendency is understood by dissolved gas analysis using Duval’s triangle and Duval’s pentagon methods for mineral oil and non-mineral oils accordingly. It is observed that the influence of low energy discharges on liquid degradation is higher in mineral oils than synthetic esters. The fault gasses in mineral oil are involved with electrical and thermal faults accompanied by stray gassing whereas only partial discharge activity is noticed for synthetic esters. Importantly, the existence of low energy discharge faults like corona discharges will involve a generation of excess high molecular weight products as compared to low molecular weight products that are soluble in liquid volume.

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Prebreakdown and Breakdown Phenomena in Ester Dielectric Liquids

Rózga¹,

Jayasree²,

Rao³

et al. 2021

Alternative Liquid Dielectrics for High Voltage Transformer Insulation Systems

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Lightning properties of selected insulating synthetic esters and mineral oil in point-to-sphere electrode system

Cited by 29 publications

References 20 publications

Investigation of the Lightning Impulse Breakdown Voltage of Mineral Oil based Fe3O4 Nanofluids

Investigation of the Lightning Impulse Breakdown Voltage of Mineral Oil based Fe3O4 Nanofluids

Influence of Aging on Oil Degradation and Gassing Tendency for Mineral oil and Synthetic Ester under Low Energy Discharge Electrical Faults

Prebreakdown and Breakdown Phenomena in Ester Dielectric Liquids

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