An Aspect of Transformer Inrush Current (CROSBI ID 621836)
Prilog sa skupa u zborniku | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Šulc, Ivan ; Mikulecky, Antun ; Sitar, Robert
engleski
An Aspect of Transformer Inrush Current
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.
Inrush current; core saturation; spark; copper jumper; tank coating
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
Podaci o prilogu
1-6.
2014.
objavljeno
Podaci o matičnoj publikaciji
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)
Podaci o skupu
3rd International Colloquium Transformer Research and Asset Management, Split, Croatia, October 15 – 17, 2014
predavanje
15.10.2014-17.10.2014
Split, Hrvatska