On the image representation of the quasi-static fields of a line current source above the ground

1969 ◽  
Vol 47 (23) ◽  
pp. 2731-2733 ◽  
Author(s):  
James R. Wait ◽  
Kenneth P. Spies
Keyword(s):  
Half Space ◽  
Image Representation ◽  
Current Source ◽  
Image Source ◽  
Line Current

It is shown that the influence of the homogeneous conducting half-space can be represented approximately in terms of an image source located at a complex depth.

On the image representation of the fields of a line current source above finitely conducting earth

1981 ◽  
Vol 59 (1) ◽  
pp. 117-121 ◽  
Author(s):  
A. Mohsen ◽  
L. Shafai
Keyword(s):  
Line Source ◽  
Image Representation ◽  
Current Source ◽  
Far Field ◽  
Static Limit ◽  
Line Current ◽  
Electric Line ◽  
Field Computation ◽  
Physical Resemblance

The problem of an electric line source above a conducting earth is investigated. Approximations to the integrals appearing in the solution of the problem are considered. An estimate of the neglected terms is given and interpretation of their physical resemblance is presented. The analysis does not restrict the relative magnitudes of earth and air propagation constants as in previous work. It is shown that the approximation presented is legitimate for far field computation and the results are comparable to those known for the quasi-static limit.

scholarly journals Multi-Pulse SCR Rectifiers

2021 ◽  
Author(s):  
Mei Li
Keyword(s):  
Experimental Verification ◽  
Current Source ◽  
Harmonic Distortion ◽  
Motor Drives ◽  
Line Current ◽  
High Voltage Direct Current ◽  
Battery Chargers ◽  
Power Battery ◽  
Harmonic Elimination ◽  
Three Phase

This thesis presents the introduction, analysis and experimental verification of the six-pulse SCR rectifier and multi-pulse SCR rectifiers. As a fundamental three-phase controllable ac-dc converter, the six-pulse SCR rectifier is widely used in industry. However, it generates high Total Harmonic Distortion (THD) in the line current. One of the solutions is to use multi-pulse rectifiers. Multi-pulse rectifiers could be classified into the 12-, 18-, and 24-pulse configurations. Application examples include high voltage direct current transmission systems, high power battery chargers and load commutated current source inverter powered motor drives. In this thesis, the six-, 12-, 18- and 24-pulse SCR rectifiers with inductive and capacitive loads are introduced. The line current THD and the input PF of various rectifiers are investigated. The principle of the harmonic elimination through phase-shifting transforms is analyzed by Fourer analysis and positive/negative sequence analysis. The experimental verification is accomplished on a prototype of the 12-pulse SCR recitifier.

HIGH‐FREQUENCY ELECTROMAGNETIC COUPLING BETWEEN SMALL COPLANAR LOOPS OVER AN INHOMOGENEOUS GROUND

Geophysics ◽  
1972 ◽  
Vol 37 (6) ◽  
pp. 997-1004 ◽  
Author(s):  
James A. Fuller ◽  
James R. Wait
Keyword(s):  
Half Space ◽  
High Frequency ◽  
Electromagnetic Coupling ◽  
Current Source ◽  
Vertical Axis ◽  
Loop Current ◽  
Mutual Impedance ◽  
Multiplicative Factor ◽  
The Earth ◽  
Horizontal Electric Dipole

An integral formulation is given for the fields of a loop current source which is located over a horizontally stratified half‐space and has a vertical axis. The electrical properties of the half‐space vary exponentially with the depth into the earth. An asymptotic solution is developed for the case of source and observer on the interface but separated by a large numerical distance. The approximate solution is then used to determine the mutual impedance between two small loops and between the loop and a horizontal electric dipole, when the antennas are on the interface. It is found that the effect of stratification on the mutual impedance is represented approximately by a single multiplicative factor.

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