Electrostatic and Electrodynamic Field Analyses of 33kV Line Insulators

2006 ◽  
Vol 7 (3) ◽  
Author(s):  
Ibrahim A. Metwally ◽  
Md Abdus Salam ◽  
Ali Al-Maqrashi ◽  
Saif AR Sumry ◽  
Saif SH Al-Harthy
Keyword(s):  
Electric Field ◽  
Current Density ◽  
High Current Density ◽  
Experimental Tests ◽  
Finite Element Models ◽  
High Current ◽  
Density Profiles ◽  
Fully Integrated ◽  
Software Modules ◽  
Simulation Results

Electrostatic and electrodynamic field analyses of 33kV line insulators were introduced to compare the electric-field and the current density profiles of commonly used line insulators in Oman; namely, silicone rubber (SiR) and porcelain line post insulators, and porcelain cap and pin insulator string. SLIM software package was used for such simulation, which is a fully integrated collection of software modules that provides facilities for the generation and solution of electromagnetic finite element models. The simulation results reveal that for the electrostatic simulation under pollution conditions, SiR and porcelain line-post insulators give maximum values of the electric field of 360kV/m and 1700kV/m, respectively. The latter value exceeds the recommended electric field level of 500kV/m. For the electrodynamic simulation under pollution conditions, the electric field and the current density are much higher for porcelain insulator compared to those of SiR insulator. The simulation of four cap-pin standard insulator string reveals that there is high electric field (1250kV/m) at the cap-insulator gap which can cause high current density for polluted case. Finally, the trend of the simulation results has been verified by experimental tests, which has been conducted on different 33kV line insulators having different designs and materials.

Void Elongation Phenomena Observed in Polycrystalline Cu Interconnects at a High Current Density Stressing Conditions

1997 ◽  
Vol 473 ◽  
Author(s):  
S. Shingubara ◽  
S. Kajiwara ◽  
T. Osaka ◽  
H. Sakaue ◽  
T. Takahagi
Keyword(s):  
Image Analysis ◽  
Electric Field ◽  
Grain Boundaries ◽  
Morphological Change ◽  
Current Density ◽  
Elevated Temperatures ◽  
High Current Density ◽  
High Current ◽  
Cu Interconnects ◽  
Electric Field Direction

ABSTRACTFormation and morphological change of voids induced by electromigration in polycrystalline Cu interconnects on TiN have been investigated at various current density conditions at elevated temperatures. At first voids were formed at grain boundaries, then they grew further to elongate in the electric field direction. Void elongation parameter (a ratio of void diameters in longitudinal to lateral directions to the electric field) was 2.53 when the current density was 9×106A/cm2, while it was 1.31 when the current density was 3×106A/cm2at 400°C, 50h. Occurrence of void elongation is enhanced with increase in current density, and its relationship to grain boundaries are discussed by FIB-SIM image analysis.

Numrical Simulation on Electric Field of Galvanic Corrosion for U-Nb Alloy and 45-Steel

2013 ◽  
Vol 749 ◽  
pp. 556-560
Author(s):  
Ping Dong ◽  
Zhen Pu ◽  
Mao Bin Shuai
Keyword(s):  
Electric Field ◽  
Current Density ◽  
Electric Potential ◽  
Galvanic Corrosion ◽  
High Current Density ◽  
Potential Drop ◽  
Corrosion Current ◽  
High Current ◽  
Electrode Size ◽  
Corrosion Medium

Based on the galvanic corrosion experiment for U-Nb alloy and 45-steel in the 3.5 mass percent NaCl solutions, the galvanic corrosion electric field has been calculated by finite element method. The electric potential and the current density evolution during galvanic corrosion have been obtained. The results show that the electric potential drop between cathode and anode had obvious difference. The electric potential drop in the U-Nb alloy cathode is higher than that in the 45-steel anode, which makes the electric field in the U-Nb alloy higher than that in the 45-steel. A rather high current density exists at the ends and corners of the specimen. The permittivity of the corrosion medium only has a little effect on the corrosion electric potential, but has obvious effects on the corrosion current density. The electrode size has obvious effects on the corrosion electric potential and current density.

scholarly journals A Computational Model for High Current Density Arc Plasmas

2019 ◽  
Vol 6 (2) ◽  
pp. 115-118
Author(s):  
M. Alija ◽  
M. Kurrat
Keyword(s):  
Computational Model ◽  
Current Density ◽  
High Current Density ◽  
Research Work ◽  
Mhd Equations ◽  
Future Research ◽  
Arc Plasma ◽  
High Current ◽  
Simulation Results ◽  
Arc Plasmas

<span style="color: #000000;">A computational model for high current density arc plasmas is developed. Under the assumption of thermodynamic equilibrium the arc plasma is described as a compressible laminar fluid based on the magnetohydrodynamic (MHD) equations and the transport and thermodynamic properties of air. The arc plasma is studied in time and space on macroscopic values such as the temperature and the pressure. The simulation results are discussed and future research work is identified addressing the scientific domain of high current density arc plasmas.</span>

Conduction Behavior of Doped Polyaniline Under High Current Density and the Performance of an all Polymer Electromechanical System

1999 ◽  
Vol 600 ◽  
Author(s):  
Haisheng Xu ◽  
V. Bharti ◽  
Z.-Y. Cheng ◽  
Q. M. Zhang
Keyword(s):  
Electric Field ◽  
Conducting Polymer ◽  
Current Density ◽  
High Current Density ◽  
Electromechanical System ◽  
High Current ◽  
Maximum Current Density ◽  
Maximum Current ◽  
Conduction Behavior ◽  
Doped Polyaniline

AbstractIn many device applications, such as electro-acoustic transducers and actuators based on high strain electroactive polymers, there are many advantages to utilize conductive polymers as electrodes. However, in these applications, a high electric power usually is required which translates to high voltage and high current in the system. Hence, the maximum current density which a conducting polymer can carry is of great interest and importance. In this paper, the conduction behavior at high current density of doped polyaniline(PANI) is reported. It was found that the current density deviates strongly from the ohmic relation with the electric field in high current density region and a saturation of the current density was observed. The maximum current density Jm observed is proportional to the conductivity of the samples and for PANI doped with HCSA, Jm can reach as high as 1200 A/cm2. Making use of the conducting polymer as the electrodes for the electrostrictive P(VDF-TrFE) copolymer, an all-polymer electromechanical system was fabricated. The all-polymer films exhibit similar or larger electric field induced strain responses than those from films with gold electrodes, presumably due to reduced mechanical clamping from the electrodes. In addition, the all-polymer system also exhibits comparable dielectric and polarization properties to those of gold-electroded P(VDF-TrFE) films in a wide temperature (from −50°C to 120°C) and frequency range (from 1Hz to 1MHz). These results demonstrate that polyaniline can be used for many electro-acoustic devices and provide improved performance.

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