The calculation of circulating currents in split-winding transformer

U ovome radu istraživani su različiti načini izračuna cirkulirajućih struja kod transformator s namotima na kat. U uvodnom dijelu opisani su princip rada i nadomjesna shema transformatora. Za odabrani transformator proveden je izračun cirkulirajućih struja za različite pogone. Upotrebom programskom paketa MagNet određena je matrica induktiviteta te rasipne reaktancije između pojedinih namota. Na temelju dobivenih podataka iz MagNeta izračunate su cirkulirajuće struje pomoću programskog koda u Matlabu. Zatim je u MagNetu proveden tranzijentni proračun cirkulirajućih struja. U zadnjem dijelu rada su uspoređeni dobiveni rezultati iz MagNeta i Matlaba.In this paper is studied the special type of transformer, split-winding transformer. Working principle of the transformer is described in introduction section as well as equivalent circuit of the transformer. For selected transformer, calculation of circulating currents is conducted for different working operations. Calculation of inductance matrix and leakage reactance between certain windings are made with software package Infolytica MagNet. Circulating currents are calculated in Matlab, based on the obtained data from MagNet. Afterwards, the transient calculation of circulating currents is conducted in MagNet. In the final section of this paper are compared obtained results from MagNet and Matlab