Determination of failure location in 6 kV networks in the coordinates of three symmetrical components at transitional resistance

2021 ◽  
pp. 64-67
Author(s):  
Valeriy Aleksandrovich Soldatov ◽  
Denis Aleksandrovich Shirobokov
Keyword(s):  
Symmetrical Components ◽  
Failure Location

The Use of TMAH to Etch Silicon and Expose Metal Bridging Failures

2000 ◽  
Author(s):  
Mark Morris ◽  
James Mohr ◽  
Esteban Ortiz ◽  
Steven Englebretson
Keyword(s):  
Failure Mechanism ◽  
Schottky Diodes ◽  
Tetramethylammonium Hydroxide ◽  
Novel Approach ◽  
Failure Location ◽  
Metal Etching ◽  
Plastic Mold

Abstract Determination of metal bridging failures on plastic encapsulated devices is difficult due to the metal etching effects that occur while removing many of the plastic mold compounds. Typically, the acids used to remove the encapsulation are corrosive to the metals that are found within the device. Thus, decapsulation can result in removal of the failure mechanism. Mechanical techniques are often not successful due to damage that results in destruction of the die and failure mechanism. This paper discusses a novel approach to these types of failures using a silicon etch and a backside evaluation. The desirable characteristics of the technique would be to remove the silicon and leave typical device metals unaffected. It would also be preferable that the device passivation and oxides not be etched so that the failure location is not disturbed. The use of Tetramethylammonium Hydroxide (TMAH), was found to fit these prerequisites. The technique was tested on clip attached Schottky diodes that exhibited resistive shorting. The use of the TMAH technique was successful at exposing thin solder bridges that extruded over the edge of the die resulting in failure.

scholarly journals DETERMINATION OF FAILURE LOCATION IN POWER TRANSMISSION LINES

2018 ◽  
Vol 22 (6) ◽  
pp. 129-136
Author(s):  
Nadezhda Buryanina ◽  
◽  
Yuri Korolyuk ◽  
Elena Lesnykh ◽  
Konstantin Suslov ◽  
...  
Keyword(s):  
Transmission Lines ◽  
Power Transmission ◽  
Power Transmission Lines ◽  
Failure Location

Determination of Global and Local Tensile Behaviours of Laser Welded Ti-6Al-4V Alloy

2011 ◽  
Vol 409 ◽  
pp. 859-864 ◽  
Author(s):  
Syed Humaun Kabir Abu ◽  
Xin Jin Cao ◽  
Javad Gholipour Baradari ◽  
Priti Wanjara ◽  
Jonathan Cuddy ◽  
...  
Keyword(s):  
Elastic Modulus ◽  
Plastic Strain ◽  
Yield Stress ◽  
Three Dimensional ◽  
Image Correlation ◽  
Full Field ◽  
Failure Location ◽  
Global And Local ◽  
Dic Technique

In this study, the global and local tensile behaviours of laser welded 5.1-mm thick Ti-6Al-4V alloy were obtained at various welding speeds and defocusing distances using a digital image correlation (DIC) technique with a full field three-dimensional deformation measurement system. The local tensile properties including elastic modulus, yield stress, and maximum plastic strain were determined at various locations by assuming an iso-stress condition. It was found that the elastic modulus and yield stress were maximum in the fusion zone (FZ) and minimum in the heat-affected zone (HAZ). Porosity and underfill defects were the main reasons for the failures in the FZ and/or the HAZ. Maximum plastic strain at fracture was observed at the failure location in most cases.

Capacitor Optimization of the Single-Phase Capacitor-Run Induction Motor

2013 ◽  
Vol 273 ◽  
pp. 286-290
Author(s):  
Xu Dong Wang ◽  
Bao Bao Hao ◽  
Xiao Zhuo Xu ◽  
Qing Hua Gao
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Induction Motor ◽  
Single Phase ◽  
Current Method ◽  
Element Analysis ◽  
Symmetrical Components ◽  
Components Method

Capacitor matching in single-phase capacitor-run induction motor (SPCRIM) is investigated in this paper. Combining symmetrical components method with resultant current method, capacitor value is calculated. Relationship between turn ratio of main winding and auxiliary winding, main winding current, auxiliary winding current and capacitor value is analyzed by simulation. SPCRIM is optimized on the ground of the theoretically calculated capacitor value and turn ratio of the main and auxiliary windings with FEA (Finite Element Analysis). Results show that calculated capacitor value contributes to the determination of turn ratio of the main winding and auxiliary winding, and with appropriately calculated capacitor value and turn ratio, small winding current can be got.

Galactic orbits of stars

1966 ◽  
Vol 25 ◽  
pp. 93-97
Author(s):  
Richard Woolley
Keyword(s):  
Globular Cluster ◽  
Potential Field ◽  
High Velocity ◽  
Velocity Vector ◽  
Variable Stars ◽  
The Sun ◽  
Proper Motions ◽  
Rr Lyrae ◽  
The Galaxy

It is now possible to determine proper motions of high-velocity objects in such a way as to obtain with some accuracy the velocity vector relevant to the Sun. If a potential field of the Galaxy is assumed, one can compute an actual orbit. A determination of the velocity of the globular clusterωCentauri has recently been completed at Greenwich, and it is found that the orbit is strongly retrograde in the Galaxy. Similar calculations may be made, though with less certainty, in the case of RR Lyrae variable stars.

Distance to SN 1987A and the LMC

1999 ◽  
Vol 190 ◽  
pp. 549-554
Author(s):  
Nino Panagia
Keyword(s):  
Angular Size ◽  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Light Curves ◽  
Distance Modulus ◽  
Absolute Size ◽  
Sn 1987A

Using the new reductions of the IUE light curves by Sonneborn et al. (1997) and an extensive set of HST images of SN 1987A we have repeated and improved Panagia et al. (1991) analysis to obtain a better determination of the distance to the supernova. In this way we have derived an absolute size of the ringRabs= (6.23 ± 0.08) x 1017cm and an angular sizeR″ = 808 ± 17 mas, which give a distance to the supernovad(SN1987A) = 51.4 ± 1.2 kpc and a distance modulusm–M(SN1987A) = 18.55 ± 0.05. Allowing for a displacement of SN 1987A position relative to the LMC center, the distance to the barycenter of the Large Magellanic Cloud is also estimated to bed(LMC) = 52.0±1.3 kpc, which corresponds to a distance modulus ofm–M(LMC) = 18.58±0.05.

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