Determination of phase angle and amplitude error of voltage and current transformers up to some 100 Hz for loss measurements on power transformers

2001 ◽  
Vol 83 (1-2) ◽  
pp. 47-54 ◽  
Author(s):  
T. Leibfried
Keyword(s):  
Phase Angle ◽  
Power Transformers ◽  
Current Transformers ◽  
Amplitude Error

On-Site Low Voltage Determination of Zero-Sequence Impedances for Power Transformers

2020 ◽  
Vol 35 (2) ◽  
pp. 1048-1057
Author(s):  
Haytham Saeed ◽  
Mariana Kamel ◽  
Abdelrahman Karrar ◽  
Ahmed H. Eltom ◽  
Mark Bowman
Keyword(s):  
Low Voltage ◽  
Power Transformers ◽  
Zero Sequence

Determination of Relative Damping at Various Prestresses

1960 ◽  
Vol 33 (2) ◽  
pp. 282-301
Author(s):  
Th Kempermann ◽  
R. Clamroth
Keyword(s):  
Energy Loss ◽  
Phase Angle ◽  
Loss Factor ◽  
Short Review ◽  
The Other ◽  
Simple Function ◽  
History Of ◽  
Tan Δ ◽  
Special Case

Abstract After a short review of the history of the development of the concept of damping, the definitions—one in words, the other in the form of an equation—given in DIN 53513 are discussed, and their usefulness for measurements at various values of prestress is investigated. It is evident that the mathematical definition given in the Standard applies only in the special case when prestress and alternating stress are equal. For the complete range of prestress, the phase angle δ or some simple function of δ, such as the loss factor, tan δ, should be measured. If it is desired not to relinquish the percentage statement of the energy loss, then a new definition for the relative damping is proposed which is independent of the prestress, just as is tan δ. The dependence upon the prestress of the damping values under discussion is demonstrated in an experimental section, for various types of elastomers.

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