REDUCING TRANSFORMER INRUSH CURRENT

A start-up method for reducing inrush current to a transformer (3) when closing a switching device (2). The switching device comprises three single-pole operated current interrupting means. The method comprises monitoring a voltage (U). The method comprises, for each of a sequence of iterations: at...

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Bibliographic Details
Main Authors LINDELL, Elisabeth, MAGNUSSON, Jesper, NOHLERT, Johan, HALEN, Stefan, BIANCO, Andrea
Format Patent
LanguageEnglish
French
German
Published 27.12.2023
Subjects
CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
ELECTRICITY
EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
GENERATION
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Summary:A start-up method for reducing inrush current to a transformer (3) when closing a switching device (2). The switching device comprises three single-pole operated current interrupting means. The method comprises monitoring a voltage (U). The method comprises, for each of a sequence of iterations: at a same opening angle relative to a reference angle of the voltage, starting an opening sequence of the switching device; at a closing angle relative to the reference angle, which is shifted in relation to the closing angle of all other iterations in the sequence, starting a closing sequence of the switching device; and obtaining an indication of the overall inrush current resulting from the closing. The method comprises selecting for future use with said opening angle, the closing angle of one of the iterations in which the overall inrush current is relatively low when compared with the other iterations of the sequence.
Bibliography:Application Number: EP20220180636