Humming Noise in Electrical Transformers and Appliances

In summary, the conversation discusses the phenomenon of a low humming noise (around 50Hz) that can be heard near electrical transformers and in various types of fans and mixer/grinders. This is caused by the alternating voltage in AC circuits, which is switched at the frequency of the power grid (50Hz in Europe, 60Hz in the US). The magnetic fields generated by transformers can cause objects to vibrate at this frequency, creating the humming sound. This is a common occurrence in electrical systems and is not a cause for concern.
  • #1
PhysicoRaj
Gold Member
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Every time I walk by the electrical transformer at the end of the lane, I hear a low humming noise(≈50Hz) that is continuous. I have observed this in all types of fans. I grab the hub so that it is not able to rotate and switch it on. Then I hear this hum. When the mixer/grinder chokes, it starts to hum in the same way, same frequency. What is the cause of this and does it hum in only AC circuits?
Thanks for any help in making me understand this.
 
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  • #2
Voltage is switching every cycle of the power grid frequency, which is 50 Hz in Europe, 60 Hz in the US and one of those values in the rest of the world. Transformers generate magnetic fields with that frequency, and magnetic fields can move objects - if there is anything which is not perfectly fixed, it can move a bit in each cycle, with a frequency equivalent to the power grid frequency (or multiples of that). Oscillating objects emit sound.
 
  • #3
Thanks. I understand now.
 

1. What causes humming noise in electrical transformers and appliances?

The humming noise in electrical transformers and appliances is typically caused by the vibration of the transformer's core. This can be due to loose or faulty components, such as loose screws or damaged insulation, which create an uneven magnetic field and cause the core to vibrate.

2. Is humming noise in electrical transformers and appliances dangerous?

In most cases, humming noise in electrical transformers and appliances is not dangerous. However, it can be a sign of potential issues with the transformer or appliance, so it is important to address it to prevent any potential hazards or malfunctions.

3. Can humming noise in electrical transformers and appliances be fixed?

Yes, humming noise in electrical transformers and appliances can usually be fixed. The first step is to identify the source of the noise, which may require the help of a professional electrician. Once the source is identified, the necessary repairs or adjustments can be made to eliminate the humming noise.

4. How can I reduce humming noise in my electrical appliances?

To reduce humming noise in your electrical appliances, you can try tightening any loose screws or connections, replacing damaged insulation, or using vibration-dampening materials. If the noise persists, it is best to consult a professional for further assistance.

5. Can humming noise in electrical transformers and appliances be prevented?

In some cases, humming noise in electrical transformers and appliances can be prevented by properly maintaining the transformer or appliance. This includes regular inspections and repairs, as well as ensuring that the transformer or appliance is not overloaded or damaged. However, some humming noise may be inevitable due to the nature of electrical components.

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