Understanding Corona discharge activity in titania nanoparticles dispersed in transformer oil under AC and DC voltages

Swati, Kumari; Yadav, K. Sahitya; Sarathi, R.; Vinu, R.; Danikas, M. G.

doi:10.1109/tdei.2017.006529

Cited by 20 publications

(12 citation statements)

References 32 publications

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“…The presence of TiO 2 nanoparticles increased the viscosity of the fluid in 11.2% at 20 • C. This increase was 21.3% when ZnO nanoparticles were used to obtain the nanofluid. These results were similar to those obtained by other authors who have found that not much variation in this property is obtained when low concentrations of nanoparticles are dispersed in transformer oils [23,27].…”

Section: Density and Viscositysupporting

confidence: 92%

“…In the case of ZnO nanoparticles, the results showed that there were two optimal concentrations, the first one was between 0.02 and 0.04 wt % and the second one between 0.04 and 0.08 wt %. These results revealed that before and beyond the two possible optimal concentrations, the dielectric performance of nanofluids falls, similar results have been obtained by several authors who have studied different nanoparticles [27,30]. In order to compare the behavior of both nanofluids during thermal aging under similar conditions, the nanofluids were aged with 0.04 wt % of both nanoparticles.…”

Section: Optimum Concentrationsupporting

confidence: 85%

“…It is observed that in both nanofluids the breakdown voltage increases with the addition of nanoparticles in natural ester as it has been shown by many other authors [27][28][29][30]. It was found that 0.04 wt % of TiO 2 nanoparticles in the ester provides the highest breakdown voltage.…”

Section: Optimum Concentrationsupporting

confidence: 58%

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Effect of TiO2 and ZnO Nanoparticles on the Performance of Dielectric Nanofluids Based on Vegetable Esters During Their Aging

et al. 2020

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Over the last few decades the insulating performance of transformer oils has been broadly studied under the point of view of nanotechnology, which tries to improve the insulating and heat dissipation performance of transformer oils by suspending nanoparticles. Many authors have analyzed the thermal and dielectric behavior of vegetable oil based-nanofluids, however, very few works have studied the evolution of these liquids during thermal aging and their stability. In this paper has been evaluated the performance of aged vegetable oil based-nanofluids, which have been subjected to accelerated thermal aging at 150 °C. Nanoparticles of TiO2 and ZnO have been dispersed in a commercial natural ester. Breakdown voltage, resistivity, dissipation factor and acidity of nanofluid samples have been measured according to standard methods, as well as stability. Moreover, it has been analyzed the degradation of Kraft paper through the degree of polymerization (DP). The results have showed that although nanoparticles improve breakdown voltage, they increase the ageing of insulation liquids and dielectric paper.

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Section: Density and Viscositysupporting

confidence: 92%

Section: Optimum Concentrationsupporting

confidence: 85%

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Effect of TiO2 and ZnO Nanoparticles on the Performance of Dielectric Nanofluids Based on Vegetable Esters During Their Aging

et al. 2020

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“…The base fluid used is transformer oil. Swati et al have concluded that by adding 1 weight % of surfactant in 0.0061 weight % of titania in transformer oil have shown uniform particle distribution with high stability [16]. In addition, the nanofluid exhibit low interfacial tension and low turbidity with high flash point [17].…”

Section: Experimental Setup 21 Sample Preparationmentioning

confidence: 99%

Investigation on heat transfer characteristics of nano titania added transformer oil with hotspot temperature

et al. 2020

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The heat transfer characteristics of nanofluid produced by mixing nano titania with transformer oil, facilitated by addition of surfactants are analyzed. A 2D model is used to analyze the heat transfer and fluid flow characteristics of nano fluid for understanding the formation of hot spots in the chamber filled with nanofluid. Governing equations for conservation of mass, momentum and energy for capturing the above characteristics are described. The temperature along the vertical mid line from the hot spot are measured experimentally and compared with simulation results. Temperature distribution obtained for nanofluid and transformer oil under both steady and transient state has revealed high rate of heat dissipation in nanofluid. Streamlines have shown the presence of press board affects flow in the bulk of the cavity. Nusselt number estimated across the edges of the hot spot has shown higher convective heat transfer in nanofluid.

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“…For the ultra-high-voltage (UHV) AC transformers and converter transformers with large volumes, as shown in Figure 1, small deformation may occur during the load impact and the long journey from the manufactory to the substation, which may bring the protrusion of the metal. There have been some studies on the characteristics of corona discharge in oil under rated frequency AC and DC voltage, providing detailed information for insulation defect diagnosis and understanding discharge mechanism under the corresponding voltage [24][25][26][27]. However, research about the corona discharge in oil under low frequency is rarely reported.…”

Section: Introductionmentioning

confidence: 99%

Feature Extraction and Comprehension of Partial Discharge Characteristics in Transformer Oil from Rated AC Frequency to Very Low Frequency

Zhou

Huang

et al. 2018

Energies

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The reactive current can be reduced effectively by decreasing the frequency of the voltage in partial discharge (PD) test, especially for equipment with large capacitance. Thus, the cost and volume of the test power supply can be economized. To figure out the difference of PD characteristics in transformer oil between rated alternating-current (AC) frequency (50 Hz) and low frequency, tests are conducted from rated AC frequency to very low frequency (0.1 Hz) based on impulse current method. The results show that with the decrease of frequency, the inception voltage increases. The maximum and mean magnitude of discharge and pulse repetition rate first increase slightly, then decrease obviously. The main features of the variation of phase resolved PD (PRPD) patterns, discharge statistical patterns (phase distribution of maximum and mean discharge magnitude, pulse repetition rate q max-φ, q mean-φ, n-φ; and number distribution of discharge magnitude n-q), and their characteristic parameters (skewness S k + , S k − ; kurtosis K u + , K u − ; asymmetry A sy ; and correlation coefficient C c) are depicted in detail, which should be paid attention to when using low frequency voltage. The inner mechanism for these variations is discussed from the aspects of the influence on electric field distribution and discharge process of frequency. Additionally, the variation trend of PD characteristics with the decrease of frequency can provide more information about insulation defect, which can be the supplement for discharge mode recognition.

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Understanding Corona discharge activity in titania nanoparticles dispersed in transformer oil under AC and DC voltages

Cited by 20 publications

References 32 publications

Effect of TiO2 and ZnO Nanoparticles on the Performance of Dielectric Nanofluids Based on Vegetable Esters During Their Aging

Effect of TiO2 and ZnO Nanoparticles on the Performance of Dielectric Nanofluids Based on Vegetable Esters During Their Aging

Investigation on heat transfer characteristics of nano titania added transformer oil with hotspot temperature

Feature Extraction and Comprehension of Partial Discharge Characteristics in Transformer Oil from Rated AC Frequency to Very Low Frequency

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