Experimental study on DC biasing impact on transformer’s vibration and sound

DC biasing current through the neutral point of ac power transformer would lead the power transformer to generate more vibration and sound, this will do harm on power transformerspsila core pieces or windings and finally will threaten the safe operation of the transformers. This paper described the principle of DC biasing, designed a new DC biasing experiment to analyze how the experimental transformerpsilas vibration and sound change along with the value of DC biasing current or windings voltage and finally some curves were given in order to show the direct connection between vibration peak value, sound pressure and DC current.