Transformers Noise

Transformers usually with ferromagnetic core produce a constant hum which leads to noise which can be very annoying especially in residential areas.The major cause of this noise is a phenomena called as magnetostriction. When the ferromagnetic core of transformers is magnetize, the core length along the alternating flux decreases and increases alternatively, with an alternative decrease and increase of its cross section. this phenomena of small change in the core dimensions is known as magnetostriction, alternatively the ferromagnetic core vibrates and humming is produced. this humming is further transfered to oil, transformer tank and then surroundings. The level of sound will increase with core flux density.