Impulse performance of synthetic esters based-nanofluid for power transformer

Das, Anu Kumar; Chatterjee, Saibal

doi:10.1088/2053-1591/aae237

Cited by 8 publications

(4 citation statements)

References 15 publications

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“…Nanofluids show a versatile spectrum of applications since they exhibit an enhancement of physicochemical and electrothermal properties of the base liquid 1 – 4 . Actually, the integration of nanoparticles of different shapes, sizes, and chemical compositions results in increased breakdown voltage 5 , 6 , lower partial discharge activity 7 , improved heat transfer 8 , and radiation-proof performance 9 through mechanisms that remain the subject of ongoing investigations. In light of this evidence, natural ester oil-based nanofluids are considered as an environmentally friendly alternative to mineral oils, which are the widely used insulating media and coolants for power transformers 10 .…”

Section: Introductionmentioning

confidence: 99%

Exploring the surge current degradation of natural ester oil-based nanofluids

Tsovilis,

Peppas,

Staikos

et al. 2024

Sci Rep

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The surge endurance of natural ester oil-based nanofluids against surge events is investigated experimentally. The focus of this work is the examination, through dielectric spectroscopy measurements, of the alteration of the real and imaginary parts of the complex relative permittivity of iron oxide nanofluids as a result of an accelerated degradation test employing a sequence of repetitive current impulses produced via a 12 kV/6 kA combination wave generator. The target is the exploration of a possible implementation of nanofluids as multipurpose liquids that act, in addition to insulation and coolants, as surge absorption media. Promising experimental results are discussed and compared with those of mineral oil that is widely used as a conventional insulating liquid in power transformers.

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Section: Introductionmentioning

confidence: 99%

Exploring the surge current degradation of natural ester oil-based nanofluids

Tsovilis,

Peppas,

Staikos

et al. 2024

Sci Rep

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“…In the last few decades, aramid paper has started to be used for insulation in some transformers [6,7]. Increasingly, mineral oil has been replaced by other insulating liquids, such as synthetic and natural esters [8][9][10][11][12][13]. In recent years, an alternative to esters has emerged.…”

Section: Introductionmentioning

confidence: 99%

Diagnostics on the Basis of the Frequency-Temperature Dependences of the Loss Angle Tangent of Heavily Moistured Oil-Impregnated Pressboard

et al. 2022

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The aim of this study was to perform precision measurements of the frequency-temperature dependences of the loss angle tangent of the liquid-solid composite with the FDS Dirana meter. The composite consisted of heavily moistered oil-impregnated pressboard. The moisturization of the pressboard occurred in a manner as close as possible to the process of wetting the insulation in power transformers to a moisture content of (5.0 ± 0.2) wt. %. This value of moisture content was chosen because exceeding this value can lead to transformer failure. The measuring temperature range was from 293.15 K (20 °C) to 333.15 K (60 °C), with a step of 8 K. The measuring frequency range was 0.0001 Hz to 5000 Hz. It was observed that the shape of the frequency dependence of the loss angle tangent for a moisture content of 5.0 wt. % does not depend on the value of the measuring temperature. An increase in temperature leads to a shift of the waveforms into the higher frequency region. This is associated with a decrease in the relaxation time, and its value depends on the activation energy. It was found that a good fit of the waveforms, simulated by Dirana, to the actual tgδ waveforms obtained at temperatures between 293.15 K (20 °C) and 333.15 K (60 °C) requires the introduction of temperatures, higher than the actual insulation temperatures, into the program. It was found that estimating the moisture content for different temperatures using Dirana soft-ware for insulating an oil-impregnated pressboard produced large discrepancies from the actual content. Better results were obtained after an adjustment requiring manual temperature correction towards higher, compared to measured, temperatures. The moisture content estimated after correction by the Dirana meter ranges from of 4.5 wt. % to 5.7 wt. % and increases almost linearly with increasing measuring temperature. The average moisture content estimated by the Dirana meter for all measuring temperatures is 5.1 wt. % and is close to the actual content (5.0 ± 0.2) wt. %. The uncertainty of the estimate is ±0.43 wt. % and is more than twice as high as the true value.

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“…Das et al [17] investigated the lightning impulse BD trend of MO and synthetic ester‐based silica nanofluids with Type‐I and Type‐II electrode setup. BD enhancement with respect to particle loading is found to be linear in Type‐I system whereas it showed as average enhancement in Type‐II system of up to 15% and 32% in case of MO and ester‐based nanofluids, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…for different particle sizes, to improve its essential attributes like dielectric BD strength and thermal conductivity [6][7][8][9][10][11][12][13][14]. The studies further progressed with the different particle morphology [15], insulation oils [16][17][18][19][20][21], voltage profiles, electrode configurations and partial discharge investigations [22][23][24][25][26][27][28][29][30]. Jin et al [7] observed the enhanced AC BD strength in silica nanoparticles dispersed MO, and proposed a mechanism that the hydrophilic nature of the particle surface adsorbs the moisture from MO which has the large influence on its BD characteristics.…”

Section: Introductionmentioning

confidence: 99%