Active reduction of power transformer noise based on synchronous averaging of the residual noise signal

Power transformer noise is a low frequency periodic noise concentrated in narrow bands around harmonics of twice the power grid frequency. The dominant cause of power transformer noise is magnetostriction of the transformer core material. A method for the active reduction of transformer noise based on synchronous averaging of the residual noise signal is introduced. The algorithm is not numerically intensive and is hence suitable for implementation on a microcontroller.