Naslov
AN ASPECT OF TRANSFORMER INRUSH CURRENT

Autori
Šulc, Ivan ; Mikulecky, Antun ; Sitar, Robert

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings of the 3rd International Colloquium Transformer Research and Asset Management, Split, Croatia, October 15 – 17, 2014 / - Zagreb : Hrvatski komitet međunarodne konferencije za velike električne sisteme (CIGRE), 2014

Skup
3rd International Colloquium Transformer Research and Asset Management, Split, Croatia, October 15 – 17, 2014

Mjesto i datum
Split, Hrvatska, 15.10.2014. - 17.10.2014

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Inrush current; core saturation; spark; copper jumper; tank coating

Sažetak
Paper analyzes a sparking phenomena that were observed on power transformers during their first few energizing. Sparks occurred on the flange between tank cover and tank side, in spite of the fact that a jumper (copper link) was used. The phenomenon was observed on transformers from different manufacturers, with various transformer ratings, three or five limb core. Paper proposes a simple electromagnetic model for analyzing the phenomena. Three-phase power transformer is modeled in finite element method (FEM) magnetic software. Simplified 3D transformer model is used in order to simulate well known core saturation during the inrush current event. Voltages between tank cover and tank side are calculated for simulated conditions. The same model is used for calculation of possible currents flowing between tank cover and tank side, showing that a value of several kA can be reached. In spite of the fact that the observed phenomenon is harmless mitigation measures are proposed. However, by doing nothing, sparking would disappear very soon.

Izvorni jezik
Engleski

Znanstvena područja
Elektrotehnika

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