Results 11 to 20 of about 3,337,621 (340)

Lightning impulse breakdown voltage of synthetic and natural ester liquids-based Fe3O4, Al2O3 and SiO2 nanofluids

Alexandria Engineering Journal, 2020
This article deals with the study the negative lightning impulse breakdown voltage (LI-BDV) of MIDEL 1204 natural and MIDEL 7131 synthetic ester liquids when adding small amounts of specific nanoparticles (NPs); the considered NPs being magnetic (Fe3O4 ...
Usama Khaled, Abderrahmane Beroual
doaj   +3 more sources

Influence of ageing on oil degradation and gassing tendency under high-energy electrical discharge faults for mineral oil and synthetic ester

High Voltage, 2020
In this work, mineral oil and synthetic esters were selected at different ageing factors (based on acidity values). Fresh and aged oils have been subjected to high-energy discharges (repeated 100 breakdowns) to simulate electric faults of highly ...
L. Loiselle, U. Mohan Rao, I. Fofana, I. Fofana   +3 more
doaj   +2 more sources

Experimental Validation of a Method of Drying Cellulose Insulation in Distribution Transformers Using Circulating Synthetic Ester

IEEE Access, 2021
The article concerns a method of drying cellulose insulation of distribution transformers with the use of synthetic ester. This method uses the high solubility of water in the ester compared to other dielectric liquids.
Piotr Przybylek, Krzysztof Walczak, Wojciech Sikorski, Hanna Moscicka-Grzesiak, Hubert Moranda, Mateusz Cybulski   +5 more
doaj   +2 more sources

Streaming Electrification of Nycodiel 1255 Synthetic Ester and Trafo EN Mineral Oil Mixtures by Using Rotating Disc Method

Energies, 2020
Power transformers are the main element of an electric power system. The service life of these devices depends to a large extent on the technical condition of their insulation system.
Maciej Zdanowski
doaj   +2 more sources

Statistical Investigation of Lightning Impulse Breakdown Voltage of Natural and Synthetic Ester Oils-Based Fe₃O₄, Al₂O₃ and SiO₂ Nanofluids

IEEE Access, 2020
The characteristics of lighting impulse breakdown voltage (LI-BDV) constitute key performance indicators of insulating materials, especially in insulations based on liquids and liquid-paper for high voltage applications.
Abderrahmane Beroual, Usama Khaled
doaj   +2 more sources

Application of Synthetic Ester for Drying Distribution Transformer Insulation—The Influence of Cellulose Thickness on Drying Efficiency

Energies, 2019
A high level of insulation moisture in a transformer increases the breakdown probability and forces a reduction of its load. Therefore, there is a need to dry the transformer insulation.
Piotr Przybylek, Hubert Moranda, Hanna Moscicka-Grzesiak, Dominika Szczesniak   +3 more
doaj   +2 more sources

Soluble pozzolanic materials from coal bottom ash as cement replacement material [PDF]

, 2021
Nowadays, intensive research in production of highly reactive pozzolanic materials from industrial waste to replace cement is crucial. This action expected to increase industrial waste recycling rate and at the same time reduce extraction of non ...
Abd Wahab, Azrina, Embong, Rahimah, Kusbiantoro, Andri, Muthusamy, Khairunisa   +3 more
core   +1 more source

Impact of Surfactants on the Electrical and Rheological Aspects of Silica Based Synthetic Ester Nanofluids

IEEE Access, 2022
This study reports experimental investigations of the effects of different surfactants (CTAB, Oleic acid and Span 80) on silica based synthetic ester nanofluids.
S. K. Amizhtan, A. J. Amalanathan, R. Sarathi, B. Srinivasan, Ramesh L Gardas, H. Edin, N. Taylor   +6 more
semanticscholar   +1 more source

DC and AC Tests of Moisture Electrical Pressboard Impregnated with Mineral Oil or Synthetic Ester—Determination of Water Status in Power Transformer Insulation

Energies, 2022
In this study, the conductivity and permittivity of electrical pressboard—insulating liquid—water composites were investigated, and the electrical properties of the composites and water were analysed comparatively.
P. Żukowski, P. Rogalski, T. Kołtunowicz, K. Kierczyński, M. Zenker, A. Pogrebnjak, M. Kucera   +6 more
semanticscholar   +1 more source

Synthetic applications of ortho esters [PDF]

Pure and Applied Chemistry, 1999
Abstract
Wipf, P, Tsuchimoto, T, Takahashi, H
openaire   +1 more source