The sub-surface magnetic fields produced by a line current source on a non-flat earth

1972 ◽  
Vol 95 (1) ◽  
pp. 150-156 ◽  
Author(s):  
James R. Wait ◽  
R. E. Wilkerson
Keyword(s):  
Magnetic Fields ◽  
Current Source ◽  
Line Current

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.

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.

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