What reasons can cause abnormal noise in transformers?

During the operation of a transformer, the occurrence of abnormal noise can be attributed to various factors.

When the transformer operates under overload conditions, internal copper and iron losses increase, leading to elevated temperatures and reduced heat dissipation. In such situations, the transformer may emit a dull humming sound, caused by saturation of the transformer core and an increase in magnetic flux density.

Poor internal contacts in the transformer can result in localized discharge, generating sparking noises. This type of sound is typically sharp and continuous.

Loose components within the transformer can also lead to unusual noises. These components may vibrate during operation, colliding with surrounding structures and producing clanking or other miscellaneous sounds.

Grounding or short circuit faults in the system can contribute to abnormal sounds. Ground faults may damage the transformer winding insulation, leading to discharge noises, while short circuit faults can cause a sudden increase in load, resulting in a surge of current that may lead to an explosive noise from the transformer.

The startup of large electric motors can also impact transformers. Due to significant load changes during motor startup, transformers need to respond quickly, possibly causing buzzing or rumbling noises.

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