What is the reason of humming sound in transformer?
Humming sound from a transformer can be caused by several factors, including:
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Magnetic Hysteresis: Hysteresis is a phenomenon where the magnetic domains in the core material of the transformer lag behind the applied magnetic field, which can create a humming noise.
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Mechanical Resonance: The core and windings of a transformer can vibrate at certain frequencies, causing a humming sound. This is particularly likely if the transformer is poorly mounted or if there are loose components.
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Eddy Currents: Eddy currents are circulating currents that are generated within the core material of the transformer when it is subjected to a changing magnetic field. These currents can generate heat and also cause the core to vibrate, resulting in a humming sound.
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Electromagnetic Interference (EMI): Transformers can act as antennas, picking up electromagnetic interference (EMI) from other electrical components. This EMI can create a humming sound.
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Imbalanced Loads: If the load connected to the output of the transformer is not balanced, it can cause a humming sound due to the unequal current distribution in the windings.
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