polarity test of transformer
Current flows from a high voltage point to a low voltage point because of the potential difference . Electrical polarity describes the direction of this current flow. In a DC system, one pole is always positive, and the other is negative, so the current flows in one direction. In an AC system, the terminals change polarity periodically, changing the direction of the current. We use dot convention to identify the voltage polarity of the mutual inductance of two windings. The two used conventions are: If a current enters the dotted terminal of one winding, then the voltage induced on the other winding will be positive at the dotted terminal of the second winding. If a current leaves the dotted terminal of one winding, then the polarity of the voltage induced in the other winding will be negative at the dotted terminal of the second winding. Distribution transformers need to operate continuously and handle high demand during peak times. To manage this, we connect transformers i...