Why Transformers Hum

Magnetic fields cause the internal accessories of the transformer to vibrate at a frequency of either 50 or 60 Hz. May 29 2016 by admin Transformer noise is caused by a phenomenon which causes a piece of magnetic sheet steel to extend itself when magnetized.

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Almost all large power transformers lets say 5 MVA are three phase units so the hum youll hear when you are near them is the third harmonic of their fundamental operating frequency.

Why transformers hum. The humming of the transformer is due to the magnetic field of the 50 or 60 Hz current causing the thin metal laminations of the transformer to vibrate and create the humming sound. Transformer hum also arises through the vibration caused when the load current passes through the windings interacting with the leakage flux it generates. Your transformer of course is subject to so many other factors.

Those large transformers are using a changing magnetic field to transfer a large amount of power. Magnetostriction may be partially controlled by the transformer design but it cannot be totally eliminated. The housing internal lamination layers whatever it can.

But it was my understanding that the hum was due to magnetostriction of the iron. Size change depends on the strength of the B-field and so happens at twice the AC mains frequency. This size change gets transmitted as sound to whatever holds the transformer.

You hear a low pitch as the AC line frequency is low some 50 or 60 Hz depending on where you are. Here in the US 180 Hz. There is a significant amount of DC in the power supply hence why it is humming.

Dont touch anything in a substation or generating plant unless you know what you are doing. Why do transformers get louder as they age. Magnetostriction is a second source of vibration in which the core iron changes shape minutely when exposed to magnetic fields.

Over time the transformer core adhesive starts to break apart and the laminated layers separate from each other slightly. I dont think it has to do with a failing laminations. Stray magnetic fields and magnetostriction.

The windings on the transformer may not be as fixed as it should be so it is causing minor movements that induces the hum. Humming sound of transformer is caused due to magnetostriction of transformer core. The frequency of noise is twice the frequency if applied input voltage.

The basic cause of transformer noise is magnetostriction. In this article we will discuss the cause of humming noise in transformer reduce procedure etc. The 60Hz electrical current passing through it causes it to flex slightly and vibrate at that frequency a phenomenon scientists call magnetostriction.

It is associated with expansion and contraction of core laminations. Noise can be air borne as well as ground borne vibrations. Magnetostriction may be partially controlled by the transformer design but it cannot be totally eliminated.

Actually the humming noise is associated with the alternating current and we know that transformer only work with alternating current. The causes and reduction of transformer noise has been the subject of many research papers for at least two generations. The intensity of the fields and thus the hum intensity is a function of the applied voltage.

Its a fact of life that an electronic transformer will make a buzzing noise. This load noise level is determined by the size of the load current. This is not in anyway dangerous.

Electric hum around transformers is caused by stray magnetic fields causing the enclosure and accessories to vibrate. However if the transformer is excessively warm and the humming only just beginning after running previously without any humming it could indicate that there is excessive loading due to shorted secondary windings of the transformer. The vibration of these layers is the humming noise you can hear and once the adhesive starts to break the sound gets louder.

This produces an audible hum. When the magnetization is taken away it goes back to its original condition. Why do Transformers Hum.

Transformers hum because they dont know the words i know iknow that bad for lunch I had three cans of alphabet soup then afterwards I had a huge vowel movement Save Share. It has come to prominence again mainly because transformers are placed closer to the populacein high rise office buildings apartments shopping malls and in their gardens. The expansion and contraction of the iron core laminations due to the magnetic effect of alternation current flowing through the transformer coils.

Impurities in the metal minute changes in power and even other local magnetic fields cause your transformers hum to be more unique than a pure input signal. As a side effect that field can wiggle other pieces of metal. The main reason for Humming in Transformer is Magnetostriction which depends upon the stray magnetic field.

The basic cause of transformer noise is magnetostriction. What you hear you can also feel. The other source of the electric hum produced by a transformer is magnetostriction.

The expansion and contraction of the iron core laminations due to the magnetic effect of alternation current flowing through the transformer coils. Transformers hum for two main reasons. This produces an audible hum.

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