Results 51 to 60 of about 66,524 (310)

Electrical breakdown mechanism and life prediction of thermal-aged epoxy/glass fibre composites

Polymer Testing
Epoxy/glass fibre composites possess excellent mechanical and electrical properties and are widely utilised in electrical and electronic power equipment. However, the composites exhibit relatively poor thermal conductivity, causing the temperature of the
Pengfei Wang, Ji Liu, Zhen Li, Chao Zhang, Longfei Zhang, Shouming Wang, Mingze Zhang   +6 more
doaj   +1 more source

Electrical-Mechanical Model of Electrical Breakdown of Epoxy-Impregnated-Paper Insulated Tubular Busbar With Bubble Defects

IEEE Access, 2020
Insulated tubular busbar is a new type of current-carrying equipment with excellent performance. However, the research on this equipment is insufficient because of the short application and the lack of technical digestion, which has resulted in many ...
Xiang Ren, Ling Ruan, Haiyun Jin, Guanjun Zhang   +3 more
doaj   +1 more source

Creep‐Induced Microstructural Evolution in an A2‐B2 Superalloy

Advanced Engineering Materials, EarlyView.
A 27.3Ta‐27.3Mo‐27.3Ti‐8Cr‐10Al (at.%) refractory high‐entropy alloy with precipitation‐strengthened A2‐B2 microstructure was studied by creep tests at 1030°C, which demonstrate a transition in deformation mechanisms in the range of 100–150 MPa applied stress. This is associated with changes in dislocation–precipitate interactions. Relevant deformation
Liu Yang, Aparajita Pramanik, Sandipan Sen, Shubhashis Dixit, Marcel Muench, R. J. Vikram, Daniel Schliephake, Yolita M. Eggeler, Ankur Chauhan, Martin Heilmaier, Alexander Kauffmann   +10 more
wiley   +1 more source

Electrical breakdown in vacuum

Vacuum, 1953
Direct and impulse voltages were applied to an electrode system in a vacuum of the order of 10−5 mm Hg. Of particular interest were the results obtained with a needle-and-sphere system, the breakdown voltage of which was considerably higher than that of a normal sphere-gap with the same electrode spacing, especially when a very fine needle was used ...
openaire   +3 more sources

Characterization of the susceptibility of ore particles to breakdown in high voltage pulse breakage and the influencing factors

International Journal of Mining Science and Technology
The susceptibility of ore particles to electrical breakdown plays a critical role for high voltage pulse (HVP) breakage, yet its quantitative characterization still lacks deep understanding.
Rui Sun, Yang Hong, Daqian Wang, Liang Si, Jianguo Yang, Wei Huang, Liefeng Huang, Weiran Zuo   +7 more
doaj   +1 more source

Estimation of water content in a power transformer using moisture dynamic measurement of its oil

High Voltage, 2017
Careful monitoring of high voltage equipments and diagnosing the critical conditions before they lead to a disaster are prerequisites of condition-based maintenance.
Vahid Sarfi, Saeed Mohajeryami, Alireza Majzoobi   +2 more
doaj   +1 more source

Creep Properties and Deformation Mechanism of Additively Manufactured NiAl‐CrMo Composites

Advanced Engineering Materials, EarlyView.
Additively manufactured NiAl‐CrMo composites contain numerous interfaces and cell boundaries that control their creep response. At 700°C under high applied stress, creep is dominated by dislocation‐controlled power‐law mechanisms. At 800°C–900°C and lower stresses, creep is primarily diffusion‐controlled along cell boundaries.
Jan Vollhüter, Andreas Bezold, Johan Westraadt, Katharina Fiegl, Subham Chattoraj, Benjamin Wahlmann, Carolin Körner, Michael Mills, Mathias Göken, Steffen Neumeier   +9 more
wiley   +1 more source

Impulse dielectric behaviour of dry air in sphere-plane gap

The Journal of Engineering, 2019
The dielectric strength of dry air is lower than that of SF(6), so it is very difficult to use dry air in extra-high-voltage-class gas-insulated equipment.
Zilu Jin, Feng Li, Wu Lu, Yuan Gao, Wenbin Zhao   +4 more
doaj   +1 more source

Evaluation of Plasticity and Creep Parameters From Tensile Stress–Strain Data for a Range of Strain Rates

Advanced Engineering Materials, EarlyView.
This plot compares experimental tensile stress–strain curves (with 4 different strain rates) and corresponding modelled curves (obtained using the optimised sets of Voce and Miller–Norton parameter values shown). The inferred M‐N values, characterizing the creep, are very similar to those obtained via conventional creep testing.
S. Ooi, R. P. Thompson, T. W. Clyne
wiley   +1 more source

Pre-breakdown Characteristics of Contaminated Power Transformer Oil [PDF]

, 2007
In this paper we have studied pre-breakdown characteristics of transformer oil in the presence of different levels of contamination. The contaminant is fibrous dust from pressboard insulation used for high voltage transformers.
Zuber, H M, M. H. Zuber, G. Chen, Chen, G   +3 more
core   +1 more source