Title :
On the no-load loss of power transformers under voltages with sub-harmonics
Author :
Arslan, Engin ; Sakar, S. ; Balci, Murat E.
Author_Institution :
BEST Transformers Co., Balkesir, Turkey
Abstract :
Power transformers are traditionally designed for their utilization in sinusoidal voltage and current conditions. However, the non-linear loads are largely proliferated in the modern power systems. Thus, pec (point of common coupling) voltages and line currents usually have harmonically distorted or non-sinusoidal waveshapes. This study focuses on the parametrical analysis of transformer no-load loss under the excitation voltage with several sub-harmonic contents. For this aim, a computationally efficient technique is developed by combining both the harmonic-domain model of transformer windings and Finite Element Method (FEM) based modeling of transformer core. The obtained simulation results figured out that effect of sub-harmonic voltages on the transformer core loss is negligible. However, it is also seen that small amount of sub-harmonic voltages may highly contribute the winding loss under the no-load condition, and they should carefully be handled for the derating of power transformers.
Keywords :
finite element analysis; harmonics; losses; power transformers; FEM; Finite Element Method; harmonic domain model; no-load loss; nonlinear loads; point of common coupling; power transformer; transformer core loss; transformer windings; voltages subharmonics; Decision support systems; Tin; FEM analysis; Transformers; harmonic distortion; no-load loss; sub-harmonics;
Conference_Titel :
Energy Conference (ENERGYCON), 2014 IEEE International
Conference_Location :
Cavtat
DOI :
10.1109/ENERGYCON.2014.6850433