During the operation of the transformer, due to the alternating magnetic flux, the silicon steel sheet of the transformer core vibrates and produces sound. During normal operation, this sound is clear and regular, but when the load of the transformer changes significantly or the operation state is abnormal, the sound will increase more than usual, with intermittent noise or rough sound, collectively called abnormal sound.

Through summary and analysis, we have listed a total of six treatment methods for abnormal buzzing sound in transformers. The specifics are as follows:

1. The internal iron core or clamps of the distribution transformer are loose, the sound becomes louder, and there are intermittent noises. After testing, the load current is not high, the temperature is not high, the secondary no-load voltage is basically balanced, and the operation is not monitored; if the sound continues to increase, you should consider replacing it for maintenance.

2. The distribution transformer has shock loads, such as frequent starting of larger motors, intermittent work of electric welding machines, etc., which cause sudden increases and decreases in sound and irregular changes. A clear judgment can be made by measuring the load. As long as it does not exceed the allowable load standard and does not exceed the allowable voltage fluctuation, it does not need to be dealt with; if it exceeds the allowable range, it should be dealt with after clearing the responsibilities. If the user equipment is approved for use, the power supply department must consider increasing the capacity of the distribution transformer; if the user equipment is used without approval, it will not only be required to stop using it immediately, but also impose necessary penalties.