Electro-convection in natural ester based transformer fluid

Jaroszewski, Maciej; Béroual, Abderrahmane; Dziedziul, Marek

doi:10.1109/tdei.2018.007267

Cited by 3 publications

(1 citation statement)

References 16 publications

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“…Soleymanzadeh et al [19] used charge measurement for position estimation for piezoelectric actuators. Jaroszewski et al [20] analyzed electro-convection phenomena in vegetable and also transformer oil.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Dielectric Liquid Electrification in the Shuttle System with Two Parallel Electrodes

Zmarzły

Frącz

2021

Energies

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In this paper, a device with swinging plate electrodes has been proposed to measure contact electrification of a liquid sample. The proposed structure is composed of two parallel metallic plates immersed in a dielectric liquid. One of the plates is swinging with a constant frequency in a range from 0.4 to 4 Hz. The paper investigates the dependence in time and frequency of electrode velocity and streaming electrification. The measured current occurs for a very low intermittent velocity of less than 10 mm/s. In this range, the electrification current is around 50 pA. For higher velocities of up to 150 mm/s, the current is at the level of 1200 pA. The time–frequency characteristic using short-time Fourier transform shows no temporal changes in the frequency spectrum. The dependence of electrification on shuttle speed was calculated and it can be approximated with a second order polynomial model with the determination coefficient higher than 0.9. The advantage of the sensor is the ability to measure electrification phenomena without the necessity of having rotating electrodes or having a large volume of flowing liquids.

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Section: Introductionmentioning

confidence: 99%

Measurement of Dielectric Liquid Electrification in the Shuttle System with Two Parallel Electrodes

Zmarzły

Frącz

2021

Energies

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Effect of voltage type and polarity on streamer dynamics in transformer oil

Bhatt

2022

Materials Today: Proceedings

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A Critical Overview of the Impact of Nanoparticles in Ester Fluid for Power Transformers

2023

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This paper examines the impact of various nanoparticles on ester fluids with a special focus on their usage towards power transformers. The precautionary measures to be considered on the nanofluids such as preparation methodologies with an appropriate surfactant and its stability is well elucidated. The electrical double layer (EDL) formation around the nanoparticles on its diffusion in the insulating fluid is explained by its different layers away from the particle surface. The partial discharge of ester nanofluids with different detection methods is elaborated on its comparison with conventional IEC 60270 measurements. The field configurations on ester-nanofluids govern the breakdown mechanism with variations in the streamer patterns. The equation of relaxation time towards breakdown is valid only when it is lower than the initiation time for streamers. The flow charges induced at the solid/liquid interface inside transformers depends on the structure of the nanofluid and the condition of pressboard/paper insulation. The impact of different concentrations of nanoparticles on ester nanofluids observes a change in its flow behaviour affecting the streaming current. The permittivity of nanofluid depends on the polarization of nanoparticles where the Clausius-Mossotti equation governing this mechanism is explained towards ester-nanofluids. The viscosity of nanofluids observed no significant variation whereas the other physio-chemical properties such as flash point, interfacial tension, and oxidation stability improved depending on the type of nanoparticle. The addition of metal-oxide nanoparticles on ester fluids increases thermal conductivity with different models proposed based on the structure and shape of a nanoparticle. The impact of ageing on nanofluids observes an instability over a longer ageing duration with specific nanoparticles which should be better understood before implementing them in real-time power transformers.

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Electro-convection in natural ester based transformer fluid

Cited by 3 publications

References 16 publications

Measurement of Dielectric Liquid Electrification in the Shuttle System with Two Parallel Electrodes

Measurement of Dielectric Liquid Electrification in the Shuttle System with Two Parallel Electrodes

Effect of voltage type and polarity on streamer dynamics in transformer oil

A Critical Overview of the Impact of Nanoparticles in Ester Fluid for Power Transformers

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