Study of Transformer Harmonic Loss Characteristic in Distribution Network Based on Field-Circuit Coupling Method

Abstract

One of the primary causes of additional losses in dry-type distribution transformers is harmonic disturbances in the distribution network. It is critical to investigate the change law of trans-former losses under harmonic conditions. The effect of harmonics on transformer core losses and winding losses is first investigated in this paper. The field-circuit coupling method is then used to create a finite element model of a three-phase phase dry type distribution transformer. Finally, the relationship between core loss and harmonic voltage, winding loss and harmonic current is calculated and analyzed for each harmonic frequency. The AC resistance factor model is found to be more accurate than the conventional model in calculating transformer harmonic winding losses. This paper’s findings have significant theoretical implications for the analysis of harmonic losses and loss reduction in distribution networks.

Research on on-line monitoring method for losses of distribution transformer in the case of single-phase grounding condition

“…The loss characteristics of distribution transformers can reflect their operating status, and the losses during transformer operation are divided into iron loss and copper loss [10], [11] . The iron loss value can reflect the magnetic circuit problems of the transformer, such as the insulation condition of the iron core.…”