Métodos y aparatos para operación suave de transformadores usando excitación de devanado auxiliar

MÉTODO QUE COMPRENDE PROPORCIONAR UNA CORRIENTE MAGNETIZANTE A UN TRANSFORMADOR DESPUÉS DE LA DESCONEXIÓN DE UN DEVANADO PRIMARIO DEL TRANSFORMADOR A PARTIR DE UNA FUENTE DE ENERGÍA; APARATO; UNIDAD MOTORA. An electrical system includes a transformer structured to be selectively coupled to an AC source that provides a main AC voltage, the transformer having a number of sets of primary windings and a number of sets of secondary windings, and a charging module structured to generate a magnetizing AC voltage. The charging module is structured to selectively provide the magnetizing AC voltage to: (i) one of the number of sets primary windings, or (ii) one of the number of sets secondary windings. The magnetizing AC voltage is such that responsive to the magnetizing AC voltage being provided to one of the number of sets of primary windings or one of the number of sets of secondary windings, one or more of the number of sets of primary windings will be magnetized in a manner wherein a flux of the one or more of the number of primary windings is in phase with the main AC voltage provided from the AC source.