Results 1 to 10 of about 1,861 (307)

Intrinsic AC Dielectric Breakdown Strength of Polyimide Films at the Extreme: New Breakthrough Insights on Thickness Dependence

Advanced Materials Interfaces
To date, the AC dielectric breakdown strength of polyimide (PI) films, as for most polymers, is understood to follow a thickness dependency with a measured power law exponent, n ≈ 0.5. However, this work experimentally demonstrates that the AC dielectric
Sombel Diaham, Paul Lambkin, Lawrence O'Sullivan, Baoxing Chen   +3 more
doaj   +2 more sources

Charge migration of multilayer oil paper on the process of partial discharge under AC voltage

IET Generation, Transmission & Distribution, 2021
As one of the main reasons for the deterioration of Nomex paper and charge migration, partial discharge (PD) plays a critical role during PD degradation. In this study, the PD characteristics of multilayer oil paper are focused on.
Bo Gao, Yixuan Li, Kai Liu, Xiaonan Li, Yan Yang, Guangning Wu   +5 more
doaj   +1 more source

Breakdown voltage and thermal performance of nanofilled transformer oil considering natural and forced cooling systems

IET Generation, Transmission & Distribution, 2021
Effect of adding nanofillers on transformer oil breakdown voltage and its thermal performance finds a great interest from researchers and scientists.
Mohamed E. Ibrahim, Samy M. El‐Behiry, A. A. Hussien, Mohamed A. Izzularab, Amr M. Abd‐Elhady   +4 more
doaj   +1 more source

Optimization of Electricity Consumption using Dielectric Barrier Discharge Method (DBD)

Majlesi Journal of Electrical Engineering, 2023
Dielectric Barrier Discharges (DBDs) are self-sustaining electrical discharges in electrode configurations containing an insulating material in the discharge path.
Noushin Dadashzadeh
doaj   +1 more source

DC breakdown characteristics and charges accumulation behaviour of thermally upgraded paper aged in natural ester

IET Science, Measurement & Technology, 2021
Considering that the working temperature is much higher in high‐voltage direct‐current (HVDC) convert transformers than in conventional AC transformers, the combination of thermally upgraded paper and natural ester might be a better choice to withstand ...
Runhao Zou, Jian Hao, Yanqing Li, Ruijin Liao, Wenping Li   +4 more
doaj   +1 more source

Ageing of DC conduction in thermally aged oil‐impregnated pressboard

IET Science, Measurement & Technology, 2021
Ageing of the conduction process in a dielectric allows a better understanding of the phenomena. Available literature shows that the DC conductivity of oil impregnated pressboard increases with applied electric stress, particularly above 40 °C.
Nasirul Haque, Sovan Dalai, Biswendu Chatterjee, Sivaji Chakravorti   +3 more
doaj   +1 more source

Partial discharge observation of a complex insulation structure model and residual space charge characteristics investigation under repeated lightning impulses

IET Science, Measurement & Technology, 2021
In this research, the authors concentrated on a rarely studied part in the power transformer's insulation structure: the connection part of radial and axial spacers. An experimental model was constructed to simulate this part.
Li Lu, Satoshi Ichimura, Toshiaki Rokunohe   +2 more
doaj   +1 more source

Interfacial breakdown between dielectric surfaces determined by gas discharge [PDF]

2017 IEEE Conference on Electrical Insulation and Dielectric Phenomenon (CEIDP), 2017
This paper examines the influence of the elastic modulus and applied contact pressure on the tangential AC breakdown strength (BDS) of polymer solid-solid interfaces theoretically and experimentally. In the experiments, three different materials with different elastic moduli, namely cross-linked polyethylene (XLPE), cured end product of epoxy resin ...
Kantar, Emre, Mauseth, Frank, Ildstad, Erling, Hvidsten, Sverre   +3 more
openaire   +2 more sources

Novel Characterization of Si- and SiC-Based PWM Inverter Bearing Currents Using Probability Density Functions

Energies, 2022
The high frequency PWM voltage pulses from a two-level six-switch inverter produce a common-mode voltage in an electric machine’s windings, a fraction of which appears on the machine shaft due to electrostatic (capacitive) coupling.
Ryan Collin, Alex Yokochi, Annette von Jouanne   +2 more
doaj   +1 more source

Plasma electrolytic oxidation of metals [PDF]

Journal of the Serbian Chemical Society, 2013
In this lecture results of the investigation of plasma electrolytic oxidation (PEO) process on some metals (aluminum, titanium, tantalum, magnesium, and zirconium) were presented.
Stojadinović Stevan
doaj   +1 more source