TY  - JOUR
T1  - Impact Study of Non-Sinusoidal Load Parameters on Real-Power Losses in
3-Phase Double-Wound Power Transformers:
Method of Constant Coefficients
AU - Kostinskiy, Sergey AU - Troitskiy, Anatoly 
JO  - Journal of Engineering and Applied Sciences
VL  - 12
IS  - 20
SP  - 5058
EP  - 5068
PY  - 2017
DA  - 2001/08/19
SN  - 1816-949x
DO  - jeasci.2017.5058.5068
UR  - https://makhillpublications.co/view-article.php?doi=jeasci.2017.5058.5068
KW  - Method of constant coefficients
KW  -non-sinusoidal load
KW  -technical losses
KW  -t-equivalent circuit
KW  -three-phase two-wound power transformer
KW  -transformer total power losses
AB  - The increase in unbalanced and non-sinusoidal loads is one of the main factors of power quality
deterioration. In this regard, new methods of rational use of power resources are required. This study is devoted
to the impact study of non-sinusoidal load parameters on real-power losses in three-phase two-wound power
transformers by means of constant coefficients. This study provides an algorithm to calculate transformer total
power losses using a developed method of constant coefficients. This method allows going back from the
classical method of equivalent circuits for each harmonic component. We have used the electrical circuit theory,
modern methods of electric circuit analysis and synthesis, the equivalent resistance method and the method
of equivalent sine to achieve this purpose. Branch currents are calculated in one phase of equivalent circuit of
TWTL system based on this equivalent circuit (magnetic coupling of HV and LV windings, replaced by their
electrical equivalent and parameters of LV windings are under HV). In connecting capacity load to LV terminals,
signs “plus” of the last real and imaginary numerator terms and of the last denominator term should be changed
to negative in the right-hand side of the last equation. Thus, we have determined the total power losses in
single-phase transformer under non-sinusoidal load (in one phase of a 3-phase transformer) by summing up
the power losses of each harmonic component in the load. The proposed calculation algorithm for transformer
real-power losses by developed method of constant coefficients allows going back from the classical method
of equivalent circuits for each harmonic component.
ER  -