An improved polarization model to analyze the breakdown strength of nano‐liquid under impulse breakdown test

Li, Diangeng; Zhang, Zicheng; Liu, Shifei; Li, Song

doi:10.1049/mna2.12046

Cited by 2 publications

(2 citation statements)

References 26 publications

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“…The point's radius of curvature is 50 μm and the diameter of the sphere is 12.7 mm. For the conduction of the experiment, the up and down method is implemented [11,27,48]. Starting from a relatively low voltage with respect to the expected LI BDV, 3 voltage applications take place at each voltage level.…”

Section: Methodsmentioning

confidence: 99%

“…If at least 1 BD occurs, then the voltage is automatically reduced by 2 kV and a 5 min interval is applied before the next shot. The same process continues until 10 BD events are obtained, followed by statistical analysis with their adjustment to the Weibull distribution [11,15,17,27,48]. The equivalent circuit of the impulse generator is shown in Figure 5(a).…”

Section: Methodsmentioning

confidence: 99%

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Dielectric and Thermal Response of TiO₂ and SiC Natural Ester Based Nanofluids for Use in Power Transformers

Κούτρας

Peppas²,

Fetsis

et al. 2022

IEEE Access

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The improvement of dielectric and thermal properties of insulating oils used in High Voltage (HV) equipment has been a key part of research over the last three decades. In this study, a natural ester oil is used as matrix oil and dispersions of two semi-conducting nanoparticles (NPs), titanium oxide (TiO2) and silicon carbide (SiC), are prepared in 0.004 weight percentage ratio (0.004% w/w). In terms of thermal features, thermal diffusivity and thermal conductivity are measured over a large temperature range between 25 and 90 o C. By means of the dielectric properties, the Lightning Impulse Breakdown Voltage (LI BDV) of nanofluids (NFs) is measured and compared to the corresponding ones of the matrix. Moreover, the dielectric constant and dielectric dissipation factor (DDF) are determined for the NF and matrix samples in the frequency range of 1 to 10 6 Hz. The obtained results show that the NF containing SiC NPs is characterized from the greatest increase in thermal conductivity, by 58% with respect to natural ester oil's, as well as the lowest dielectric constant in both 25 and 90 o C, most likely due to their higher permittivity and thermal conductivity. Lastly, the LI BDV of the same NF is the most enhanced, by 10% relatively to the matrix, while a numerical model in COMSOL Multiphysics is developed and is found to successfully verify the LI BDV results.INDEX TERMS insulating nanofluid, lightning impulse, dielectric constant, thermal conductivity, numerical model.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Dielectric and Thermal Response of TiO₂ and SiC Natural Ester Based Nanofluids for Use in Power Transformers

Κούτρας

Peppas²,

Fetsis

et al. 2022

IEEE Access

View full text Add to dashboard Cite

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Simulation of the Lightning Impulse Breakdown in Insulating Nanofluids and Comparison to Experimental Results

Κούτρας

Fetsis

Peppas³

et al. 2022

2022 IEEE International Conference on High Voltage Engineering and Applications (ICHVE)

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An improved polarization model to analyze the breakdown strength of nano‐liquid under impulse breakdown test

Cited by 2 publications

References 26 publications

Dielectric and Thermal Response of TiO₂ and SiC Natural Ester Based Nanofluids for Use in Power Transformers

Dielectric and Thermal Response of TiO₂ and SiC Natural Ester Based Nanofluids for Use in Power Transformers

Simulation of the Lightning Impulse Breakdown in Insulating Nanofluids and Comparison to Experimental Results

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An improved polarization model to analyze the breakdown strength of nano‐liquid under impulse breakdown test

Cited by 2 publications

References 26 publications

Dielectric and Thermal Response of TiO2 and SiC Natural Ester Based Nanofluids for Use in Power Transformers

Dielectric and Thermal Response of TiO2 and SiC Natural Ester Based Nanofluids for Use in Power Transformers

Simulation of the Lightning Impulse Breakdown in Insulating Nanofluids and Comparison to Experimental Results

Contact Info

Product

Resources

About

Dielectric and Thermal Response of TiO₂ and SiC Natural Ester Based Nanofluids for Use in Power Transformers

Dielectric and Thermal Response of TiO₂ and SiC Natural Ester Based Nanofluids for Use in Power Transformers