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AN ASPECT OF TRANSFORMER INRUSH CURRENT

Ivan Šulc ; Končar - Electrical Engineering Institute Inc.
Robert Sitar ; Končar - Electrical Engineering Institute Inc.
Antun Mikulecky ; Končar - Electrical Engineering Institute Inc.

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.

Ključne riječi

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

Hrčak ID:

199226

URI

https://hrcak.srce.hr/199226

Datum izdavanja:

15.8.2017.

Posjeta: 584 *